JPWO2013088501A1 - Drive control apparatus for hybrid vehicle - Google Patents

Abstract

A drive control device for a hybrid vehicle that suppresses vibration of a power transmission system is provided. A clutch CL for connecting / disconnecting the carrier C1 of the first planetary gear unit 14 and the carrier C2 of the second planetary gear unit 16 and a brake BK for connecting / disconnecting the carrier C2 to / from the housing 26 are provided. When the transmission system resonance is detected or predicted, the engagement state is switched between at least one of the clutch CL and the brake BK. Therefore, when the resonance of the power transmission system is detected or predicted, the power transmission is performed. By changing the inertia balance of the system, the resonance point can be changed, and the occurrence of resonance can be suitably suppressed.

Description

  The present invention relates to a drive control device for a hybrid vehicle, and more particularly to an improvement for suppressing vibration of a power transmission system.

  A hybrid vehicle is known that includes at least one electric motor that functions as a drive source in addition to an engine such as an internal combustion engine. For example, this is the vehicle described in Patent Document 1. According to this technique, in the hybrid vehicle including the internal combustion engine, the first electric motor, and the second electric motor, the brake is provided to fix the output shaft of the internal combustion engine to the non-rotating member, and according to the traveling state of the vehicle. By controlling the engagement state of the brake, it is possible to improve the energy efficiency of the vehicle and to travel according to the driver's request.

JP 2008-265600 A

  However, in the conventional technique, for example, when the traveling road surface of the vehicle is a wavy road surface, the frequency of the input torque (variation) input from the traveling road surface side to the power transmission system and the resonance frequency in the power transmission system May coincide with each other, or when the frequency of fluctuations related to engine start and the resonance frequency in the power transmission system coincide with each other, the input torque may be amplified to increase the vibration of the power transmission system. there were. Such a problem has been newly found in the process in which the present inventors have intensively studied in order to improve the performance of a hybrid vehicle.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a drive control device for a hybrid vehicle that suppresses vibration of a power transmission system.

  In order to achieve such an object, the gist of the first invention is that the first rotating element connected to the first electric motor, the second rotating element connected to the engine, and the output rotating member. A first differential mechanism including a third rotating element; a first rotating element coupled to a second electric motor; a second rotating element; and a third rotating element, wherein the second rotating element and the third rotating element Any one of the second differential mechanism connected to the third rotating element in the first differential mechanism, the second rotating element in the first differential mechanism, and the second rotating element in the second differential mechanism And a clutch that selectively engages a rotation element that is not connected to the third rotation element in the first differential mechanism among the third rotation elements, a second rotation element in the second differential mechanism, and 3rd time in said 1st differential mechanism among 3rd rotation elements A brake that selectively engages a rotating element not connected to the element with a non-rotating member, and when resonance of the power transmission system in the hybrid vehicle is detected or predicted, The engagement state of at least one of the clutch and the brake is switched.

  Thus, according to the first aspect of the present invention, the first rotating element connected to the first electric motor, the second rotating element connected to the engine, and the third rotating element connected to the output rotating member are provided. 1 differential mechanism, and the 1st rotation element connected with the 2nd electric motor, the 2nd rotation element, and the 3rd rotation element, and any one of these 2nd rotation elements and the 3rd rotation element is the 1st difference. Of the second differential mechanism coupled to the third rotary element in the moving mechanism, the second rotary element in the first differential mechanism, and the second rotary element and the third rotary element in the second differential mechanism A clutch that selectively engages a rotating element that is not connected to the third rotating element in the first differential mechanism; and the second of the second rotating element and the third rotating element in the second differential mechanism. One not connected to the 3rd rotation element in 1 differential mechanism A brake that selectively engages the rotating element with the non-rotating member, and when resonance of the power transmission system in the hybrid vehicle is detected or predicted, the engagement of at least one of the clutch and the brake When the resonance of the power transmission system is detected or predicted, the resonance point is changed by changing the inertia balance of the power transmission system, and the occurrence of resonance is suitably suppressed. Can do. That is, it is possible to provide a drive control device for a hybrid vehicle that suppresses vibration of the power transmission system.

  The gist of the second invention subordinate to the first invention is that the shift position of the hybrid vehicle is a stop position, and the temperature of the power transmission system is equal to or lower than a predetermined threshold value. In this case, the engagement state of at least one of the clutch and the brake is switched. The temperature of the power transmission system preferably corresponds mainly to the temperature of the engine such as water temperature or oil temperature and the temperature of the battery connected to the first electric motor and the second electric motor. In this way, the resonance of the power transmission system can be detected or predicted in a practical manner, and the occurrence of resonance can be suitably suppressed.

  The gist of the third invention subordinate to the first invention is that a change input to the power transmission system is detected or predicted based on a vehicle speed and a rotational speed of the engine from a predetermined relationship. In this case, the engagement state of at least one of the clutch and the brake is switched. In this way, the resonance of the power transmission system can be detected or predicted in a practical manner, and the occurrence of resonance can be suitably suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a skeleton diagram illustrating a configuration of a hybrid vehicle drive device to which the present invention is preferably applied. It is a figure explaining the principal part of the control system provided in order to control the drive of the drive device of FIG. FIG. 2 is an engagement table showing clutch and brake engagement states in each of five types of travel modes established in the drive device of FIG. 1. FIG. FIG. 4 is a collinear chart that can represent the relative relationship of the rotational speeds of the respective rotary elements on a straight line in the drive device of FIG. FIG. 4 is a collinear diagram that can represent the relative relationship of the rotation speeds of the respective rotary elements on a straight line in the drive device of FIG. 1, corresponding to mode 2 of FIG. 3. FIG. 4 is a collinear diagram that can represent the relative relationship of the rotational speeds of the respective rotary elements on a straight line in the drive device of FIG. FIG. 4 is a collinear diagram that can represent the relative relationship of the rotational speeds of the respective rotary elements on a straight line in the drive device of FIG. 1, corresponding to mode 5 of FIG. 3. It is a figure explaining the transmission efficiency in the drive device of FIG. It is a functional block diagram explaining the principal part of the control function with which the electronic control apparatus in the drive device of FIG. 1 was equipped. In the drive device of FIG. 1, it is a figure which illustrates typically that the resonant frequency of a power transmission system changes according to the engagement state of a clutch. It is a figure explaining the change of the characteristic (resonance frequency) of the power transmission system according to the engagement state of the clutch in the drive device of FIG. In the drive device of FIG. 1, it is a figure which illustrates typically that the resonant frequency of a power transmission system changes according to the engagement state of a clutch and a brake. It is a figure explaining the change of the characteristic (resonance frequency) of the power transmission system according to the engagement state of the clutch and brake in the drive device of FIG. It is a figure explaining the resonance point change control at the time of engine starting by the electronic controller with which the drive device of Drawing 1 was equipped. It is a flowchart explaining the principal part of the resonance point change control by the electronic controller with which the drive device of FIG. 1 was equipped. 7 is a flowchart for explaining a main part of another resonance point change control by an electronic control device provided in the drive device of FIG. 1. It is a skeleton diagram explaining the composition of the other hybrid vehicle drive device to which the present invention is applied suitably. It is a skeleton diagram explaining the composition of still another hybrid vehicle drive device to which the present invention is preferably applied. It is a skeleton diagram explaining the composition of still another hybrid vehicle drive device to which the present invention is preferably applied. It is a skeleton diagram explaining the composition of still another hybrid vehicle drive device to which the present invention is preferably applied. It is a skeleton diagram explaining the composition of still another hybrid vehicle drive device to which the present invention is preferably applied. It is a skeleton diagram explaining the composition of still another hybrid vehicle drive device to which the present invention is preferably applied.

  The clutch and the brake are preferably hydraulic engagement devices whose engagement state is controlled (engaged or released) according to the hydraulic pressure, for example, a wet multi-plate friction engagement device. However, a meshing engagement device, that is, a so-called dog clutch (meshing clutch) may be used. Alternatively, the engagement state may be controlled (engaged or released) according to an electrical command, such as an electromagnetic clutch or a magnetic powder clutch.

  In the drive device to which the present invention is applied, one of a plurality of travel modes is selectively established according to the engagement state of the clutch and the brake. Preferably, the operation of the engine is stopped and the brake is engaged and the clutch is released in an EV traveling mode in which at least one of the first electric motor and the second electric motor is used as a driving source for traveling. Thus, mode 1 is established, and mode 2 is established by engaging both the brake and the clutch. In the hybrid travel mode in which the engine is driven and the first electric motor and the second electric motor drive or generate electric power as necessary, the mode is set when the brake is engaged and the clutch is released. Mode 4 is established when the brake is released and the clutch is engaged, and mode 5 is established when both the brake and the clutch are released.

  In the present invention, preferably, in the collinear diagram of each rotating element in each of the first differential mechanism and the second differential mechanism when the clutch is engaged and the brake is released. The arrangement order indicates the first rotation in the first differential mechanism when the rotation speeds corresponding to the second rotation element and the third rotation element in each of the first differential mechanism and the second differential mechanism are superimposed. An element, a first rotating element in the second differential mechanism, a second rotating element in the first differential mechanism, a second rotating element in the second differential mechanism, a third rotating element in the first differential mechanism, and a second rotating element. It is the order of the 3rd rotation element in 2 differential mechanisms.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings used for the following description, the dimensional ratios and the like of each part are not necessarily drawn accurately.

  FIG. 1 is a skeleton diagram illustrating the configuration of a hybrid vehicle drive device 10 (hereinafter simply referred to as drive device 10) to which the present invention is preferably applied. As shown in FIG. 1, the drive device 10 of the present embodiment is a device for horizontal use that is preferably used in, for example, an FF (front engine front wheel drive) type vehicle and the like, and an engine 12, which is a main power source, The first electric motor MG1, the second electric motor MG2, the first planetary gear device 14 as a first differential mechanism, and the second planetary gear device 16 as a second differential mechanism are provided on a common central axis CE. ing. The driving device 10 is configured substantially symmetrically with respect to the central axis CE, and the lower half of the central line is omitted in FIG. The same applies to each of the following embodiments.

  The engine 12 is, for example, an internal combustion engine such as a gasoline engine that generates a driving force by combustion of fuel such as gasoline injected in a cylinder. The first electric motor MG1 and the second electric motor MG2 are preferably so-called motor generators each having a function as a motor (engine) for generating driving force and a generator (generator) for generating reaction force. Each stator (stator) 18, 22 is fixed to a housing (case) 26 that is a non-rotating member, and the rotor (rotor) 20, 24 is provided on the inner peripheral side of each stator 18, 22. Has been.

  The first planetary gear unit 14 is a single pinion type planetary gear unit having a gear ratio of ρ1, and serves as a second rotating element that supports the sun gear S1 and the pinion gear P1 as the first rotating element so as to be capable of rotating and revolving. A ring gear R1 as a third rotating element that meshes with the sun gear S1 via the carrier C1 and the pinion gear P1 is provided as a rotating element (element). The second planetary gear device 16 is a single pinion type planetary gear device having a gear ratio of ρ2, and serves as a second rotating element that supports the sun gear S2 and the pinion gear P2 as the first rotating element so as to be capable of rotating and revolving. A ring gear R2 as a third rotating element that meshes with the sun gear S2 via the carrier C2 and the pinion gear P2 is provided as a rotating element (element).

  The sun gear S1 of the first planetary gear unit 14 is connected to the rotor 20 of the first electric motor MG1. The carrier C1 of the first planetary gear unit 14 is connected to an input shaft 28 that is rotated integrally with the crankshaft of the engine 12. The input shaft 28 is centered on the central axis CE. In the following embodiments, the direction of the central axis of the central axis CE is referred to as an axial direction (axial direction) unless otherwise distinguished. . The ring gear R1 of the first planetary gear device 14 is connected to an output gear 30 that is an output rotating member, and is also connected to the ring gear R2 of the second planetary gear device 16. The sun gear S2 of the second planetary gear device 16 is connected to the rotor 24 of the second electric motor MG2.

  The driving force output from the output gear 30 is transmitted to a pair of left and right drive wheels (not shown) via a differential gear device and an axle (not shown). On the other hand, torque input to the drive wheels from the road surface of the vehicle is transmitted (input) from the output gear 30 to the drive device 10 via the differential gear device and the axle. A mechanical oil pump 32 such as a vane pump is connected to an end portion of the input shaft 28 opposite to the engine 12, and an original pressure of a hydraulic control circuit 60 or the like to be described later when the engine 12 is driven. The hydraulic pressure is output. In addition to the oil pump 32, an electric oil pump driven by electric energy may be provided.

  The carrier C1 of the first planetary gear device 14 and the carrier C2 of the second planetary gear device 16 are selectively engaged between the carriers C1 and C2 (between the carriers C1 and C2). A clutch CL is provided. A brake BK for selectively engaging (fixing) the carrier C2 with respect to the housing 26 is provided between the carrier C2 of the second planetary gear device 16 and the housing 26 which is a non-rotating member. Yes. The clutch CL and the brake BK are preferably hydraulic engagement devices whose engagement states are controlled (engaged or released) according to the hydraulic pressure supplied from the hydraulic control circuit 60. For example, a wet multi-plate friction engagement device or the like is preferably used, but a meshing engagement device, that is, a so-called dog clutch (meshing clutch) may be used. Furthermore, an engagement state may be controlled (engaged or released) according to an electrical command supplied from the electronic control device 40, such as an electromagnetic clutch or a magnetic powder clutch.

  As shown in FIG. 1, in the driving device 10, the first planetary gear device 14 and the second planetary gear device 16 are arranged coaxially with the input shaft 28 (on the central axis CE), and , Are arranged at positions facing each other in the axial direction of the central axis CE. That is, with respect to the axial direction of the central axis CE, the first planetary gear device 14 is disposed on the engine 12 side with respect to the second planetary gear device 16. With respect to the axial direction of the central axis CE, the first electric motor MG1 is disposed on the engine 12 side with respect to the first planetary gear unit 14. With respect to the axial direction of the central axis CE, the second electric motor MG1 is disposed on the opposite side of the engine 12 with respect to the second planetary gear device 16. That is, the first electric motor MG1 and the second electric motor MG2 are arranged at positions facing each other with the first planetary gear device 14 and the second planetary gear device 16 interposed therebetween with respect to the axial direction of the central axis CE. . That is, in the drive device 10, in the axial direction of the central axis CE, the first electric motor MG1, the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, Those components are arranged on the same axis in the order of the two electric motors MG2.

  FIG. 2 is a diagram for explaining a main part of a control system provided in the driving device 10 in order to control the driving of the driving device 10. The electronic control unit 40 shown in FIG. 2 includes a CPU, a ROM, a RAM, an input / output interface, and the like, and executes signal processing in accordance with a program stored in advance in the ROM while using a temporary storage function of the RAM. The microcomputer is a so-called microcomputer, and executes various controls related to driving of the drive device 10 including drive control of the engine 12 and hybrid drive control related to the first electric motor MG1 and the second electric motor MG2. That is, in this embodiment, the electronic control device 40 corresponds to a drive control device for a hybrid vehicle to which the drive device 10 is applied. The electronic control device 40 is configured as an individual control device for each control as required, such as for output control of the engine 12 and for operation control of the first electric motor MG1 and the second electric motor MG2.

As shown in FIG. 2, the electronic control device 40 is configured to be supplied with various signals from sensors, switches, and the like provided in each part of the driving device 10. That is, a signal representing an accelerator opening degree A _CC which is an operation amount of an accelerator pedal (not shown) corresponding to a driver's output request amount by the accelerator opening sensor 42, and an engine which is the rotation speed of the engine 12 by the engine rotation speed sensor 44. signal representative of the rotational speed N _E, a signal indicative of the rotational speed N _MG1 of the first electric motor MG1 by MG1 rotational speed sensor 46, a signal indicative of the rotational speed N _MG2 of the second electric motor MG2 by MG2 rotational speed sensor 48, output rotation A signal representing the rotational speed N _OUT of the output gear 30 corresponding to the vehicle speed V by the speed sensor 50, a signal representing the oil temperature T _OIL of the hydraulic oil supplied to each part in the drive device 10 by the oil temperature sensor 52, and a shift signal or the like representing the operating position P _S of the shift operating device (not shown) by the sensor 54 are each the electronic control unit 40 It is fed.

The electronic control device 40 is configured to output an operation command to each part of the driving device 10. That is, as an engine output control command for controlling the output of the engine 12, a fuel injection amount signal for controlling a fuel supply amount to an intake pipe or the like by the fuel injection device, and an ignition timing (ignition timing) of the engine 12 by the ignition device. An ignition signal to be commanded, an electronic throttle valve drive signal supplied to the throttle actuator for operating the throttle valve opening θ _TH of the electronic throttle valve, and the like are output to an engine control device 56 that controls the output of the engine 12. The A command signal for commanding the operation of the first motor MG1 and the second motor MG2 is output to the inverter 58, and electric energy corresponding to the command signal is transmitted from the battery via the inverter 58 to the first motor MG1 and the second motor. The output (torque) of the first electric motor MG1 and the second electric motor MG2 is controlled by being supplied to MG2. Electric energy generated by the first electric motor MG1 and the second electric motor MG2 is supplied to the battery via the inverter 58 and stored in the battery. A command signal for controlling the engagement state of the clutch CL and the brake BK is supplied to an electromagnetic control valve such as a linear solenoid valve provided in the hydraulic control circuit 60, and the hydraulic pressure output from the electromagnetic control valve is controlled. Thus, the engagement state of the clutch CL and the brake BK is controlled.

  The drive device 10 functions as an electric differential unit that controls the differential state between the input rotation speed and the output rotation speed by controlling the operation state via the first electric motor MG1 and the second electric motor MG2. To do. For example, the electric energy generated by the first electric motor MG1 is supplied to the battery and the second electric motor MG2 via the inverter 58. As a result, the main part of the power of the engine 12 is mechanically transmitted to the output gear 30, while a part of the power is consumed for power generation of the first electric motor MG 1 and is converted into electric energy there. The electric energy is supplied to the second electric motor MG2 through the inverter 58. Then, the second electric motor MG2 is driven, and the power output from the second electric motor MG2 is transmitted to the output gear 30. Electrical path from conversion of part of the power of the engine 12 into electrical energy and conversion of the electrical energy into mechanical energy by related equipment from the generation of the electrical energy to consumption by the second electric motor MG2. Is configured.

  In the hybrid vehicle to which the drive device 10 configured as described above is applied, the driving state of the engine 12, the first electric motor MG1, and the second electric motor MG2 and the engagement state of the clutch CL and the brake BK are set. In response, one of the plurality of travel modes is selectively established. FIG. 3 is an engagement table showing the engagement states of the clutch CL and the brake BK in each of the five types of travel modes established in the drive device 10, wherein the engagement is “◯” and the release is blank. Show. In the traveling modes “EV-1” and “EV-2” shown in FIG. 3, the operation of the engine 12 is stopped, and at least one of the first electric motor MG1 and the second electric motor MG2 is used for traveling. This is an EV travel mode used as a drive source. “HV-1”, “HV-2”, and “HV-3” are all driven by the first electric motor MG1 and the second electric motor MG2 while driving the engine 12 as a driving source for traveling, for example. This is a hybrid travel mode for driving or generating power. In this hybrid travel mode, a reaction force may be generated by at least one of the first electric motor MG1 and the second electric motor MG2, or may be idled in an unloaded state.

  As shown in FIG. 3, in the driving apparatus 10, the operation of the engine 12 is stopped, and in the EV traveling mode in which at least one of the first electric motor MG <b> 1 and the second electric motor MG <b> 2 is used as a driving source for traveling. When the brake BK is engaged and the clutch CL is released, the mode 1 (travel mode 1) is “EV-1”, and when the brake BK and the clutch CL are both engaged, the mode is 2 (travel mode 2), “EV-2”, is established. In the hybrid traveling mode in which the engine 12 is driven as a driving source for traveling, for example, and the first electric motor MG1 and the second electric motor MG2 are driven or generated as necessary, the brake BK is engaged. “HV-1”, which is mode 3 (travel mode 3) when the clutch CL is released, and mode 4 (travel mode 4) when the brake BK is released and the clutch CL is engaged. “HV-2”, which is the mode 5 (travel mode 5), is established by releasing both the brake BK and the clutch CL.

  FIGS. 4 to 7 show the rotational elements of the driving device 10 (the first planetary gear device 14 and the second planetary gear device 16) having different connection states depending on the engagement states of the clutch CL and the brake BK. FIG. 2 shows a collinear chart that can represent the relative relationship of rotational speed on a straight line, showing the relative relationship of the gear ratio ρ of the first planetary gear device 14 and the second planetary gear device 16 in the horizontal axis direction, It is a two-dimensional coordinate which shows a relative rotational speed in an axial direction. The rotational speeds of the output gears 30 when the vehicle moves forward are represented as positive directions (positive rotations). A horizontal line X1 indicates zero rotation speed. In the vertical lines Y1 to Y4, in order from the left, the solid line Y1 is the sun gear S1 (first electric motor MG1) of the first planetary gear unit 14, the broken line Y2 is the sun gear S2 (second electric motor MG2) of the second planetary gear unit 16, The solid line Y3 is the carrier C1 (engine 12) of the first planetary gear unit 14, the broken line Y3 'is the carrier C2 of the second planetary gear unit 16, and the solid line Y4 is the ring gear R1 (output gear 30) of the first planetary gear unit 14. ), The broken line Y4 ′ indicates the relative rotational speed of each ring gear R2 of the second planetary gear unit 16. 4 to 7, vertical lines Y3 and Y3 ′ and vertical lines Y4 and Y4 ′ are overlaid. Here, since the ring gears R1 and R2 are connected to each other, the relative rotational speeds of the ring gears R1 and R2 indicated by the vertical lines Y4 and Y4 ′ are equal.

  4 to 7, the relative rotational speeds of the three rotating elements in the first planetary gear device 14 are indicated by a solid line L1, and the relative rotational speeds of the three rotating elements in the second planetary gear device 16 are illustrated. Each is indicated by a broken line L2. The intervals between the vertical lines Y1 to Y4 (Y2 to Y4 ′) are determined according to the gear ratios ρ1 and ρ2 of the first planetary gear device 14 and the second planetary gear device 16. That is, regarding the vertical lines Y1, Y3, Y4 corresponding to the three rotating elements in the first planetary gear device 14, the space between the sun gear S1 and the carrier C1 corresponds to 1, and the carrier C1 and the ring gear R1 The interval corresponds to ρ1. Regarding the vertical lines Y2, Y3 ', Y4' corresponding to the three rotating elements in the second planetary gear device 16, the space between the sun gear S2 and the carrier C2 corresponds to 1, and the carrier C2 and the ring gear R2 The interval corresponds to ρ2. That is, in the drive device 10, the gear ratio ρ2 of the second planetary gear device 16 is preferably larger than the gear ratio ρ1 of the first planetary gear device 14 (ρ2> ρ1). Hereinafter, each traveling mode in the drive device 10 will be described with reference to FIGS.

  “EV-1” shown in FIG. 3 corresponds to mode 1 (traveling mode 1) in the driving device 10, and preferably the operation of the engine 12 is stopped and the second electric motor MG2 is stopped. Is an EV traveling mode used as a driving source for traveling. FIG. 4 is a collinear diagram corresponding to this mode 1, and will be described using this collinear diagram. When the clutch CL is released, the carrier C1 and the second planetary gear device 14 of the first planetary gear unit 14 are disengaged. The planetary gear device 16 can rotate relative to the carrier C2. Engagement of the brake BK causes the carrier C2 of the second planetary gear device 16 to be connected (fixed) to the housing 26, which is a non-rotating member, so that its rotational speed is zero. In this mode 1, in the second planetary gear device 16, the rotation direction of the sun gear S2 and the rotation direction of the ring gear R2 are opposite to each other, and negative torque (torque in the negative direction) is generated by the second electric motor MG2. Is output, the torque causes the ring gear R2, that is, the output gear 30, to rotate in the positive direction. That is, by outputting negative torque by the second electric motor MG2, the hybrid vehicle to which the drive device 10 is applied can be caused to travel forward. In this case, preferably, the first electric motor MG1 is idled. In this mode 1, the relative rotation of the clutches C1 and C2 is allowed, and EV travel control similar to EV travel in a vehicle equipped with a so-called THS (Toyota Hybrid System) in which the clutch C2 is connected to a non-rotating member. It can be performed.

  “EV-2” shown in FIG. 3 corresponds to mode 2 (traveling mode 2) in the driving apparatus 10, and preferably the operation of the engine 12 is stopped and the first electric motor MG1 is stopped. In addition, this is an EV traveling mode in which at least one of the second electric motor MG2 is used as a driving source for traveling. FIG. 5 is a collinear diagram corresponding to this mode 2. If the collinear diagram is used to explain, the carrier C1 of the first planetary gear device 14 and the first planetary gear device 14 are engaged by engaging the clutch CL. The relative rotation of the two planetary gear unit 16 with the carrier C2 is disabled. Further, when the brake BK is engaged, the carrier C2 of the second planetary gear device 16 and the carrier C1 of the first planetary gear device 14 engaged with the carrier C2 are non-rotating members. Are connected (fixed) to each other and their rotational speed is zero. In this mode 2, the rotation direction of the sun gear S1 is opposite to the rotation direction of the ring gear R1 in the first planetary gear device 14, and the rotation of the sun gear S2 is reversed in the second planetary gear device 16. The direction and the rotation direction of the ring gear R2 are opposite to each other. That is, when negative torque (torque in the negative direction) is output from the first electric motor MG1 to the second electric motor MG2, the ring gears R1 and R2, that is, the output gear 30 are rotated in the positive direction by the torque. . That is, the hybrid vehicle to which the drive device 10 is applied can be caused to travel forward by outputting negative torque by at least one of the first electric motor MG1 and the second electric motor MG2.

  In the mode 2, it is possible to establish a mode in which power generation is performed by at least one of the first electric motor MG1 and the second electric motor MG2. In this form, it becomes possible to share and generate driving force (torque) for traveling by one or both of the first electric motor MG1 and the second electric motor MG2, and each electric motor is operated at an efficient operating point. Or running that relaxes restrictions such as torque limitation due to heat. Furthermore, it is possible to idle one or both of the first electric motor MG1 and the second electric motor MG2 when power generation by regeneration is not allowed, such as when the battery is fully charged. That is, in the mode 2, it is possible to perform EV traveling under a wide range of traveling conditions, or to perform EV traveling continuously for a long time. Therefore, the mode 2 is suitably employed in a hybrid vehicle having a high EV traveling ratio such as a plug-in hybrid vehicle.

  “HV-1” shown in FIG. 3 corresponds to mode 3 (traveling mode 3) in the driving device 10, and preferably, the engine 12 is driven and used as a driving source for traveling. This is a hybrid travel mode in which driving or power generation is performed by the first electric motor MG1 and the second electric motor MG2 as necessary. The collinear diagram of FIG. 4 also corresponds to this mode 3. If described using this collinear diagram, the carrier C1 of the first planetary gear device 14 and the carrier C1 are released by releasing the clutch CL. The second planetary gear device 16 can rotate relative to the carrier C2. Engagement of the brake BK causes the carrier C2 of the second planetary gear device 16 to be connected (fixed) to the housing 26, which is a non-rotating member, so that its rotational speed is zero. In mode 3, the engine 12 is driven, and the output gear 30 is rotated by the output torque. At this time, in the first planetary gear unit 14, the output torque from the engine 12 can be transmitted to the output gear 30 by causing the first electric motor MG 1 to output a reaction torque. In the second planetary gear unit 16, the rotation direction of the sun gear S2 and the rotation direction of the ring gear R2 are opposite because the brake BK is engaged. That is, when a negative torque (torque in the negative direction) is output by the second electric motor MG2, the ring gears R1 and R2, that is, the output gear 30 are rotated in the positive direction by the torque.

  “HV-2” shown in FIG. 3 corresponds to mode 4 (traveling mode 4) in the driving apparatus 10, and preferably, the engine 12 is driven and used as a driving source for traveling. This is a hybrid travel mode in which driving or power generation is performed by the first electric motor MG1 and the second electric motor MG2 as necessary. FIG. 6 is a collinear diagram corresponding to the mode 4, and will be described using this collinear diagram. When the clutch CL is engaged, the carrier C1 of the first planetary gear unit 14 and the first The relative rotation of the two planetary gear unit 16 with the carrier C2 is disabled, and the carriers C1 and C2 operate as one rotating element that is rotated integrally. Since the ring gears R1 and R2 are connected to each other, the ring gears R1 and R2 operate as one rotating element that is rotated integrally. That is, in the mode 4, the rotating elements in the first planetary gear device 14 and the second planetary gear device 16 in the driving device 10 function as a differential mechanism including four rotating elements as a whole. That is, four gears in order from the left in FIG. 6 are the sun gear S1 (first electric motor MG1), the sun gear S2 (second electric motor MG2), the carriers C1 and C2 (engine 12) connected to each other, A composite split mode is obtained in which ring gears R1 and R2 (output gear 30) connected to each other are connected in this order.

  As shown in FIG. 6, in the mode 4, it is preferable that the arrangement order of the rotating elements in the first planetary gear device 14 and the second planetary gear device 16 in the alignment chart is a sun gear S1 indicated by a vertical line Y1. The sun gear S2 indicated by the vertical line Y2, the carriers C1 and C2 indicated by the vertical line Y3 (Y3 ′), and the ring gears R1 and R2 indicated by the vertical line Y4 (Y4 ′) are arranged in this order. The gear ratios ρ1 and ρ2 of the first planetary gear device 14 and the second planetary gear device 16 are respectively shown in FIG. 6 in the collinear diagram as a vertical line Y1 corresponding to the sun gear S1 and a vertical line corresponding to the sun gear S2. It is determined that the line Y2 is arranged in the above-described order, that is, the interval between the vertical line Y1 and the vertical line Y3 is wider than the interval between the vertical line Y2 and the vertical line Y3 ′. In other words, the sun gears S1 and S2 and the carriers C1 and C2 correspond to 1, and the carriers C1 and C2 and the ring gears R1 and R2 correspond to ρ1 and ρ2. 10, the gear ratio ρ2 of the second planetary gear device 16 is larger than the gear ratio ρ1 of the first planetary gear device 14.

  In the mode 4, when the clutch CL is engaged, the carrier C1 of the first planetary gear device 14 and the carrier C2 of the second planetary gear device 16 are connected, and the carriers C1 and C2 are connected to each other. It can be rotated integrally. For this reason, the reaction force can be applied to the output of the engine 12 by either the first electric motor MG1 or the second electric motor MG2. That is, when the engine 12 is driven, the reaction force can be shared by one or both of the first electric motor MG1 and the second electric motor MG2, and the engine 12 can be operated at an efficient operating point, or the torque caused by heat. It is possible to run to ease restrictions such as restrictions.

For example, the efficiency can be improved by controlling the first motor MG1 and the second motor MG2 so as to receive the reaction force preferentially by the motor that can operate efficiently. For example, relatively vehicle speed V is high high-speed drive and at the time of relatively engine rotational speed N _E is lower low rotation, there is a case where the rotational speed N _MG1 of the first electric motor MG1 is a negative value or negative rotation. In such a case, considering that the reaction force of the engine 12 is received by the first electric motor MG1, the first electric motor MG1 is in a reverse rotation state in which electric power is consumed and negative torque is generated, resulting in a reduction in efficiency. There is a risk of connection. Here, as is apparent from FIG. 6, in the driving device 10, the rotational speed of the second electric motor MG2 indicated by the vertical line Y2 is negative compared to the rotational speed of the first electric motor MG1 indicated by the vertical line Y1. It is often difficult to take the value of and the reaction force of the engine 12 can be received in the forward rotation state. Therefore, when the rotational speed of the first electric motor MG1 is a negative value, the fuel efficiency is improved by improving the efficiency by controlling the second electric motor MG2 to receive the reaction force of the engine 12 preferentially. Can be achieved. Further, when torque is limited by heat in either the first electric motor MG1 or the second electric motor MG2, the driving force is assisted by regeneration or output of an electric motor that is not torque limited, so that the engine 12 It is possible to ensure a reaction force necessary for driving.

  FIG. 8 is a diagram for explaining the transmission efficiency in the driving device 10, wherein the horizontal axis represents the transmission ratio and the vertical axis represents the theoretical transmission efficiency. The gear ratio shown in FIG. 8 is the ratio of the input side rotational speed to the output side rotational speed, that is, the reduction ratio in the first planetary gear device 14 and the second planetary gear device 16, for example, the rotation of the output gear 30. This corresponds to the ratio of the rotational speed of the input rotary member such as the carrier C1 to the speed (rotational speed of the ring gears R1 and R2). In the horizontal axis shown in FIG. 8, the left side of the drawing is the high gear side with a small gear ratio, and the right side is the low gear side with a large gear ratio. The theoretical transmission efficiency shown in FIG. 8 is a theoretical value of the transmission efficiency in the drive device 10, and the power input to the first planetary gear device 14 and the second planetary gear device 16 is mechanical without passing through an electrical path. The maximum efficiency is 1.0 when all of the signals are transmitted to the output gear 30 by simple transmission.

  In FIG. 8, the transmission efficiency in the mode 3 (HV-1) in the driving device 10 is indicated by a one-dot chain line, and the transmission efficiency in the mode 4 (HV-2) is indicated by a solid line. As shown in FIG. 8, the transmission efficiency in the mode 3 (HV-1) in the driving device 10 is the maximum efficiency at the speed ratio γ1. At this speed ratio γ1, the rotational speed of the first electric motor MG1 (sun gear S1) becomes zero, and the electric path caused by receiving the reaction force in the first electric motor MG1 becomes zero, and only mechanical power transmission is performed. Thus, an operating point at which power can be transmitted from the engine 12 to the second electric motor MG2 to the output gear 30 is obtained. Hereinafter, such a high-efficiency operating point with zero electrical path is referred to as a mechanical point (mechanical transmission point). The gear ratio γ1 is a gear ratio on the overdrive side, that is, a gear ratio smaller than 1. Hereinafter, the gear ratio γ1 is referred to as a first mechanical transmission gear ratio γ1. As shown in FIG. 8, the transmission efficiency in the mode 3 gradually decreases as the gear ratio becomes a value on the low gear side with respect to the first machine transmission gear ratio γ1, while the gear ratio becomes the first machine transmission. As it becomes a value on the high gear side with respect to the gear ratio γ1, it decreases more rapidly than on the low gear side.

  As shown in FIG. 8, in mode 4 (HV-2) in the driving apparatus 10, the first electric motor MG1 according to the collinear diagram of FIG. 6 is used in the four rotating elements configured by the engagement of the clutch CL. And the gear ratios ρ1, ρ2 of the first planetary gear device 14 and the second planetary gear device 16 are determined so that the rotational speeds of the second motor MG2 are different positions on the horizontal axis, The transmission efficiency in mode 4 has a mechanical point in the speed ratio γ2 in addition to the speed ratio γ1. That is, at the time of the mode 4, the rotational speed of the first electric motor MG1 becomes zero at the first mechanical transmission speed ratio γ1, and the electric path due to receiving the reaction force at the first electric motor MG1 becomes zero. A mechanical point is realized as well as a mechanical point where the rotational speed of the second electric motor MG2 becomes zero at the gear ratio γ2 and the electric path by the reaction force is zero in the second electric motor MG2. Hereinafter, the speed ratio γ2 is referred to as a second mechanical transmission speed ratio γ2. The second machine transmission speed ratio γ2 corresponds to a speed ratio smaller than the first machine transmission speed ratio γ1. That is, in the mode 4 in the driving device 10, the system has a mechanical point on the high gear side with respect to the mode 3 time.

  As shown in FIG. 8, the transmission efficiency at the time of the mode 4 is sharper than the transmission efficiency at the time of the mode 3 in the region on the low gear side from the first mechanical transmission speed ratio γ1 as the speed ratio increases. descend. The region of the gear ratio between the first machine transmission speed ratio γ1 and the second machine transmission speed ratio γ2 is curved toward the low efficiency side. In this region, the transmission efficiency in the mode 4 is equal to or higher than the transmission efficiency in the mode 3. The transmission efficiency at the time of the mode 4 is relatively higher than the transmission efficiency at the time of the mode 3 although the transmission efficiency decreases in the region on the high gear side from the second mechanical transmission speed ratio γ2 as the shift ratio decreases. . That is, at the time of the mode 4, in addition to the first machine transmission speed ratio γ 1, a mechanical point is provided in the second machine transmission speed ratio γ 2 on the higher gear side than the first machine transmission speed ratio γ 1. It is possible to improve transmission efficiency during high gear operation with a small gear ratio. Therefore, for example, it is possible to improve fuel efficiency by improving transmission efficiency during relatively high-speed traveling.

  As described above with reference to FIG. 8, in the driving device 10, the engine 12 is driven as a driving source for traveling, for example, and is driven as necessary by the first electric motor MG <b> 1 and the second electric motor MG <b> 2. In addition, during hybrid traveling in which power generation is performed, transmission efficiency can be improved by appropriately switching between the mode 3 (HV-1) and the mode 4 (HV-2). For example, the mode 3 is established in the region of the gear ratio on the low gear side from the first machine low speed gear ratio γ1, while the mode 4 is established in the region of the gear ratio on the high gear side from the first machine transmission gear ratio γ1. By performing the control such that the transmission is established, the transmission efficiency can be improved in a wide gear ratio region from the low gear region to the high gear region.

  “HV-3” shown in FIG. 3 corresponds to mode 5 (travel mode 5) in the drive device 10, and is preferably used as a drive source for travel when the engine 12 is driven. This is a hybrid travel mode in which driving or power generation is performed by the first electric motor MG1 and the second electric motor MG2 as necessary. In this mode 5, it is possible to realize a mode in which the second electric motor MG2 is disconnected from the drive system and driven by the engine 12 and the first electric motor MG1. FIG. 7 is a collinear diagram corresponding to this mode 5. If described with reference to this collinear diagram, the carrier C1 of the first planetary gear unit 14 and the second planetary gear device 14 are released by releasing the clutch CL. The planetary gear device 16 can rotate relative to the carrier C2. By releasing the brake BK, the carrier C2 of the second planetary gear device 16 can be rotated relative to the housing 26, which is a non-rotating member. In such a configuration, the second electric motor MG2 can be disconnected from the drive system (power transmission path) and stopped.

  In the mode 3, since the brake BK is engaged, the second electric motor MG2 is always rotated with the rotation of the output gear 30 (ring gear R2) when the vehicle is traveling. In such a form, in the region where the rotation is relatively high, the rotation speed of the second electric motor MG2 reaches a limit value (upper limit value), or the rotation speed of the ring gear R2 is increased and transmitted to the sun gear S2. Therefore, from the viewpoint of improving efficiency, it is not always preferable to always rotate the second electric motor MG2 at a relatively high vehicle speed. On the other hand, in the mode 5, the second motor MG2 is driven by the engine 12 and the first motor MG1 by separating the second motor MG2 from the drive system at a relatively high vehicle speed, thereby driving the second motor MG2. In addition to being able to reduce drag loss when no is required, it is possible to eliminate restrictions on the maximum vehicle speed caused by the maximum rotation speed (upper limit value) allowed for the second electric motor MG2.

  As is clear from the above description, in the driving device 10, the engine 12 is driven and used as a driving source for traveling, and is driven by the first electric motor MG1 and the second electric motor MG2 as necessary. With regard to hybrid running in which power generation is performed, three combinations of HV-1 (mode 3), HV-2 (mode 4), and HV-3 (mode 5) are obtained by a combination of engagement and release of the clutch CL and the brake BK. Modes can be established selectively. Thereby, for example, by selectively establishing the mode with the highest transmission efficiency among these three modes according to the vehicle speed, the gear ratio, etc. of the vehicle, it is possible to improve the transmission efficiency and thus improve the fuel efficiency. it can.

 FIG. 9 is a functional block diagram for explaining a main part of the control function provided in the electronic control unit 40. The resonance determination unit 70 shown in FIG. 9 determines resonance of the power transmission system in the hybrid vehicle to which the drive device 10 is applied. That is, the occurrence of resonance in the power transmission system is detected or predicted. Here, the power transmission system is a device related to power transmission from a driving source to driving wheels, that is, a so-called drive line. In a hybrid vehicle to which the driving device 10 is applied, the power transmission system is the driving source. The first planetary gear unit 14 and the second planetary gear provided in the power transmission path from the engine 12, the first electric motor MG1, the second electric motor MG2, etc. to the tire 68 (see FIG. 12) as drive wheels. The power transmission device includes the gear device 16, the input shaft 28, the output gear 30, the damper 62, the differential gear device 64, the tire 66, the body 68, and the like (see FIGS. 10 and 12).

As shown in FIG. 9, the resonance determination unit 70 preferably includes a P range cryogenic temperature determination unit 72 and a fluctuation input determination unit 74, and the P range cryogenic temperature determination unit 72 to the fluctuation input determination unit 74. To determine the resonance of the power transmission system. The P-range cryogenic temperature determination unit 72 transmits the power based on whether or not the shift position of the hybrid vehicle is a stop position and the temperature of the power transmission system is equal to or lower than a predetermined threshold. Determine resonance in the system. For example, the operating position P _S of the shift operation device detected by the shift sensor 54 is in a stopped position or a parking range (parking position), and the oil temperature T _OIL detected by the oil temperature sensor 52 is predetermined If it is equal to or less than the threshold value T _bo (for example, about −20 ° C.), the resonance of the power transmission system in the hybrid vehicle is determined. In other words, when the shift position of the hybrid vehicle is a stop position, and the oil temperature T _OIL corresponding to the temperature of the power transmission system is equal to or lower than a predetermined threshold T _bo , It is determined that there is a high probability that vibration will occur in the power transmission system when the engine 12 is started. That is, the temperature of the power transmission system preferably corresponds to the oil temperature T _OIL of the hydraulic oil supplied to each part in the drive device 10, but the cooling water temperature of the engine 12, the first temperature It may correspond to the temperature of the battery connected to the electric motor MG1 and the second electric motor MG2, or corresponds to the average value of the oil temperature of the hydraulic oil, the cooling water temperature of the engine, and the battery temperature. Also good.

The variation input determination unit 74 determines a resonance in the power transmission system on the basis of the rotational speed N _E of the vehicle speed V and the engine 12 from the predetermined relationship. For example, based on the engine rotational speed sensor N _E detected by the vehicle speed V and the engine rotational speed sensor 44 corresponds to the output rotation speed N _OUT detected by the output rotation speed sensor 50, the travel road (driving wheel of the vehicle ) Is calculated from the frequency of fluctuation (input torque), and when the frequency of fluctuation substantially coincides with the resonance frequency of the power transmission system, that is, within a specified range (frequency band) centered on the resonance frequency. If included, the input of fluctuation to the power transmission system is detected or predicted. The resonance frequency of the power transmission system is determined by the inertia of each part in the driving device 10, and is determined according to the engagement state of the clutch CL and the brake BK as will be described later. In other words, preferably, the resonance frequency of the drive device 10 corresponding to the engagement state of the clutch CL and the brake BK is experimentally obtained and stored in advance, and the fluctuation input determination unit 74 is configured so that the vehicle speed V and frequency variation from the traveling road surface of the vehicle is calculated based on the engine speed N _E, whether substantially coincides with the resonance frequency of the driving device 10 in accordance with the engagement state of the clutch CL and the brake BK If the determination is affirmative, the fluctuation input to the power transmission system is detected or predicted.

  In the configuration provided with the engine 12 that is an internal combustion engine as a drive source like the drive device 10 of the present embodiment, preferably a torsional damper or the like for suppressing vibration between the engine 12 and the transaxle. Is provided. The power transmission system (drive line) including this torsional damper has a specific resonance frequency depending on the configuration of each part. In the prior art, when fluctuation from the road surface side of the vehicle is input to the transaxle, the fluctuation is amplified if the frequency of the fluctuation matches the resonance frequency of the power transmission system including the torsional damper. As a result, a large torque is applied to the power transmission system, which may affect the durability of members such as the input shaft. For this reason, in the prior art, for example, a torque limiter is set on the damper so that torque exceeding a predetermined value is not input to the input side configuration including the input shaft, or the input shaft is enlarged (larger diameter). Measures such as increasing the strength of the input side configuration were taken. However, such measures have caused new problems such as hindering downsizing and weight reduction of the apparatus and increasing manufacturing costs.

  FIG. 10 is a diagram schematically illustrating that the resonance frequency of the power transmission system differs in the driving device 10 depending on the engagement state of the clutch CL. FIG. 11 is a diagram for explaining a change in the characteristic (resonance frequency) of the power transmission system according to the engagement state of the clutch CL. The characteristic when the clutch CL is released is indicated by a solid line. The characteristics in the engaged state are indicated by broken lines, respectively. Considering a state in which the brake BK is released in the drive device 10, a resonance point (resonance frequency) in the drive device 10 is changed according to engagement or release of the clutch CL. That is, as shown in the upper stage of FIG. 10, in a state where the clutch CL is released, the second electric motor MG2 is connected to a power transmission system related to power transmission between the engine 12 and the first electric motor MG1. Absent. When the state is switched from the state to the state where the clutch CL is engaged as shown in the lower stage, the second electric motor MG2 is connected to the power transmission system related to the power transmission between the engine 12 and the first electric motor MG1. Since the configuration including the rotor 24 and the like of the second electric motor MG2 is added to the power transmission system, as shown in FIG. 11, the inertia characteristic (inertia balance) changes and the resonance point of the power transmission system changes. Is done. In particular, due to a change in the engagement state of the clutch CL, as shown in FIG. 10, resonance related to the configuration around the damper 62 (damper main) provided between the engine 12 and the configuration including the first electric motor MG1. The point is changed.

  FIG. 12 is a diagram schematically illustrating that the resonance frequency of the power transmission system differs in the drive device 10 depending on the engagement state of at least one of the clutch CL and the brake BK. FIG. 13 is a diagram for explaining a change in the characteristic (resonance frequency) of the power transmission system according to the engagement state of the clutch CL and the brake BK. The clutch CL is released and the brake BK is engaged. The characteristic in a state where the brake is engaged is indicated by a solid line, and the characteristic in a state where the clutch CL is engaged and the brake BK is released is indicated by a broken line. As shown in FIGS. 12 and 13, in the drive device 10, the drive device 10 is also changed by changing the engagement state of the brake BK in addition to or in place of changing the engagement state of the clutch CL. The resonance point (resonance frequency) at 10 is changed. That is, in the state where the clutch CL is released and the brake BK is engaged as shown in the upper part of FIG. 12, that is, in the state where the mode 3 (HV-1) shown in FIG. The second motor MG2 is not connected to a power transmission system related to power transmission between the motor 12 and the first motor MG1. The second electric motor MG2 is connected to an output-side power transmission system such as the differential gear device 64, the tire 66, and the body 68 through the configuration of the second planetary gear device 16 and the output gear 30. On the other hand, in the state where the clutch CL is engaged and the brake BK is released, that is, in the state where the mode 4 (HV-2) shown in FIG. The second electric motor MG2 is coupled to a power transmission system related to power transmission between the motor 12 and the first electric motor MG1. That is, the second electric motor MG2 is connected to the power transmission system on the input side. Therefore, as shown in FIG. 13, the inertia characteristic (inertia balance) changes and the resonance point of the power transmission system is changed.

When the resonance determination unit 70 detects or predicts the occurrence of resonance in the power transmission system, the resonance point change control unit 76 shown in FIG. 9 performs control to change the resonance point in the power transmission system. As described with reference to FIGS. 10 to 13, in the driving device 10, the resonance frequency (resonance point) of the power transmission system is changed by switching the engagement state of at least one of the clutch CL and the brake BK. Be changed. Therefore, the resonance point change control unit 76 specifically controls at least one of the clutch CL and the brake BK through the hydraulic control circuit 60 as control for changing the resonance point in the power transmission system. Control to switch between. That is, preferably, when the shift position is the stop position and the temperature of the power transmission system is equal to or lower than a predetermined threshold value T _bo , at least one of the clutch CL and the brake BK is engaged. Switch the status. Preferably, based on the predetermined relationship to the vehicle speed V and the engine rotational speed N _E, wherein when the input of the variation corresponding to the resonant frequency to the power transmission system is detected or predicted, the clutch CL and The engagement state of at least one of the brakes BK is switched.

In general, when the engine 12 is started from a vehicle stop state, the oil temperature T _{OIL of the} hydraulic oil supplied to each part of the drive device 10 at an extremely low temperature, for example, is less than a specified threshold T _bo (for example, −20 ° C.). In some cases, the friction of the engine 12 is increased, and the battery output is reduced. Therefore, it is difficult to lift the rotation of the engine 12 by cranking by the first electric motor MG1 or the like. When the battery output is increased in order to lift the rotation of the engine 12 at such extremely low temperatures, the battery may be increased in size to cause an increase in cost and weight, and there may be a problem such as deterioration in mountability. For this reason, hardware is often adapted so that the engine 12 can be started even if the rotational speed of the engine 12 that can be lifted by the first electric motor MG1 is low, and the design (specification setting) is high. It was a restriction. In particular, the resonance point of the power transmission system when the vehicle is stopped when the shift position is set to the stop position is a fluctuating frequency related to the rotation of the engine 12 (rotation at the start), that is, the primary explosion component when the power transmission system is at a very low temperature. If the frequency coincides with the frequency, resonance occurs and excessive torque is applied to the power transmission system, which affects the durability.

In order to solve the problem, the resonance point change control unit 76 is configured such that the P range is extremely cold, that is, the shift position is set to the stop position, and the temperature of the power transmission system is equal to or less than a predetermined threshold value T _bo. In this case, control for changing the resonance point of the power transmission system is performed by switching the engagement state of at least one of the clutch CL and the brake BK. Figure 14 is a diagram for explaining the resonance point change control at the time of starting the engine by the resonance point change control unit 76, it shows a change with time of the engine speed N _E according to the starting of the engine 12 at an extremely low temperature . For example, the resonance point of the power transmission system at an extremely low temperature when the clutch CL is released corresponds to a value indicated by a broken line, and the fluctuation frequency (primary explosion component) of the engine 12 lifted by the first electric motor MG1. ), When the engine 12 is started at an extremely low temperature, the clutch CL is engaged to change the resonance frequency of the power transmission system to a value indicated by a one-dot chain line. And resonance can be avoided. On the other hand, the resonance point of the power transmission system at a cryogenic temperature when the clutch CL is engaged corresponds to the value indicated by the broken line, and the fluctuating frequency (explosion primary) of the engine 12 lifted by the first electric motor MG1. When the specifications are set to substantially match the component, the clutch CL is released when the engine 12 is started at an extremely low temperature, so that the resonance frequency of the power transmission system becomes a value indicated by a two-dot chain line. It can be changed and resonance can be avoided. That is, the resonance point change control unit 76 can suitably avoid the occurrence of resonance at the start of the engine 12 by switching the engagement state of at least one of the clutch CL and the brake BK.

When the vehicle is traveling on a wavy road surface, the frequency of fluctuation input to the vehicle from the traveling road surface (the wavy road surface) is determined according to the road surface pitch, the vehicle speed V, and the like. If the fluctuation frequency input from the wavy road surface and the resonance frequency in the power transmission system are approximately the same, there is a problem that resonance occurs and an excessive torque is applied to the power transmission system, affecting the durability. It was. To solve such a problem, the resonance point change control section 76, corresponding to the resonant frequency to the power transmission system based on the predetermined relationship to the vehicle speed V and the engine rotational speed N _E (resonant frequency When the input of the fluctuation (within a predetermined frequency band centered on) is detected or predicted, the resonance point of the power transmission system is changed by switching the engagement state of at least one of the clutch CL and the brake BK. Control to change. More preferably, the engine rotational speed N _E detected by the engine rotational speed sensor 44, the MG1 rotational speed N _MG1 detected by the MG1 rotational speed sensor 46, and the MG2 rotational speed sensor 48 are determined from a predetermined relationship. MG2 rotational speed N _MG2 detected by the output rotational speed sensor 50, the vehicle speed V corresponding to the output rotational speed N _OUT detected by the output rotational speed sensor 50, and the request corresponding to the accelerator opening degree _CC detected by the accelerator opening sensor 42. Based on the driving force or the like, the frequency of the fluctuation input from the traveling road surface of the vehicle is calculated, and the fluctuation frequency is the resonance of the driving device 10 according to the engagement state of the clutch CL and the brake BK at that time. If it is determined that the frequency substantially matches, the engagement state of at least one of the clutch CL and the brake BK is disengaged. Performing a sort control. With such control, when it is determined that the vehicle is in a traveling state where resonance occurs during traveling on a wavy road, or when it is determined that the vehicle is in a traveling state where there is a high probability that resonance will occur, the resonance point of the power transmission system is set. By changing, it is possible to suitably avoid the occurrence of resonance.

  FIG. 15 is a flowchart for explaining a main part of the resonance point change control by the electronic control unit 40, which is repeatedly executed at a predetermined cycle.

First, step S1 (hereinafter abbreviated to step), the operating position P _S of the shift operation device detected by the shift sensor 54 whether the stop position or the parking range is determined. If the determination in S1 is negative, the routine is terminated. If the determination in S1 is affirmative, in S2, whether or not the temperature is extremely low, for example, the driving device 10 It is determined whether or not the oil temperature T _{OIL of the} hydraulic oil supplied to each part is equal to or lower than a specified threshold value T _bo (for example, −20 ° C.). If the determination at S2 is negative, the routine is terminated accordingly. If the determination at S2 is affirmative, it is determined at S3 whether the engine 12 has been determined to start. Is done. If the determination at S3 is negative, the routine is terminated accordingly. If the determination at S3 is affirmative, the clutch CL and brake BK are connected via the hydraulic control circuit 60 at S4. At least one of the engagement states is switched. Next, in S5, the rotation of the engine 12 is lifted by the first electric motor MG1 and the like, and the engine 12 is started via the engine control device 56, and then this routine is terminated. In the above control, S1 to S3 correspond to the operations of the resonance determination unit 70 and the P range cryogenic temperature determination unit 72, and S4 corresponds to the operation of the resonance point change control unit 76, respectively.

  FIG. 16 is a flowchart for explaining a main part of another resonance point change control by the electronic control unit 40, which is repeatedly executed at a predetermined cycle.

First, in S6, the operating position P _S is the running position such as D-range of the shift operation device detected by the shift sensor 54, S range, or whether the R-range or the like is determined. If the determination in S6 is negative, the routine is terminated. If the determination in S6 is affirmative, in S7, the vehicle speed V and the engine speed N _{E are} determined from a predetermined relationship. Based on the above, it is determined whether or not an input of a change in frequency included in a predetermined frequency band centered on a predetermined frequency, for example, a resonance frequency, to the power transmission system is detected or predicted. If the determination in S7 is negative, the routine is terminated accordingly. If the determination in S7 is affirmative, in S8, the clutch CL and brake BK are connected via the hydraulic control circuit 60. After the engagement state of at least one of these is switched, this routine is terminated. In the above control, S6 and S7 correspond to the operations of the resonance determination unit 70 and the fluctuation input determination unit 74, and S8 corresponds to the operation of the resonance point change control unit 76, respectively.

  Next, another preferred embodiment of the present invention will be described in detail with reference to the drawings. In the following description, parts common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 17 is a skeleton diagram illustrating the configuration of another hybrid vehicle drive device 100 (hereinafter simply referred to as drive device 100) to which the present invention is preferably applied. In the driving device 100 shown in FIG. 17, with respect to the axial direction of the central axis CE, the second planetary gear device 16, the clutch CL, and the brake BK sandwich the second electric motor MG2 between the first planetary gears. The gear device 14 is disposed on the opposite side of the engine 12. The clutch CL and the brake BK are preferably provided at substantially the same position with respect to the axial direction of the central axis CE. That is, in the driving device 100, the first electric motor MG1, the first planetary gear device 14, the second electric motor MG2, the second planetary gear device 16, and the clutch CL from the engine 12 side in the axial direction of the central axis CE. And the structure is arrange | positioned coaxially in order of brake BK. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 100 having such a configuration.

  FIG. 18 is a skeleton diagram illustrating a configuration of still another hybrid vehicle drive device 110 (hereinafter simply referred to as drive device 110) to which the present invention is preferably applied. In the drive device 110 shown in FIG. 18, the configuration of the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, etc., that is, the mechanical system is collectively related to the axial direction of the central axis CE. Arranged on the engine 12 side, the configurations of the first electric motor MG1 and the second electric motor MG2, etc., that is, the electrical system are collectively arranged on the opposite side of the engine 12 with respect to those configurations. That is, in the drive device 110, in the axial direction of the central axis CE, the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, the second electric motor MG2, Those components are arranged on the same axis in the order of one electric motor MG1. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 120 having such a configuration.

  FIG. 19 is a skeleton diagram illustrating the configuration of still another hybrid vehicle drive device 120 (hereinafter simply referred to as drive device 120) to which the present invention is preferably applied. In the drive device 120 shown in FIG. 19, the carrier C2 is allowed to rotate in one direction with respect to the housing 26 between the carrier C2 of the second planetary gear device 16 and the housing 26 which is a non-rotating member, and reversely. A one-way clutch (one-way clutch) OWC that prevents rotation in the direction is provided in parallel with the brake BK. The one-way clutch OWC preferably allows relative rotation of the carrier C2 in the positive direction with respect to the housing 26, while preventing rotation in the negative direction. That is, in the driving state in which the carrier C2 is rotated in the negative direction, for example, when the second motor MG2 outputs a negative torque, the modes 1 to 3 are established without engaging the brake BK. Can do. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 110 having such a configuration.

  FIG. 20 is a skeleton diagram illustrating a configuration of still another hybrid vehicle drive device 130 (hereinafter simply referred to as drive device 130) to which the present invention is preferably applied. A drive device 130 shown in FIG. 20 has a double pinion type second planetary gear device 16 'as a second differential mechanism on the central axis CE as an alternative to the single pinion type second planetary gear device 16. I have. The second planetary gear unit 16 'includes a sun gear S2' as a first rotation element, a carrier C2 'as a second rotation element that supports a plurality of pinion gears P2' meshed with each other so as to rotate and revolve, and a pinion gear. A ring gear R2 ′ as a third rotating element that meshes with the sun gear S2 ′ via P2 ′ is provided as a rotating element (element).

  The ring gear R1 of the first planetary gear device 14 is connected to an output gear 30 that is an output rotating member, and is also connected to the carrier C2 ′ of the second planetary gear device 16 ′. The sun gear S2 'of the second planetary gear device 16' is connected to the rotor 24 of the second electric motor MG2. The carrier C1 of the first planetary gear unit 14 and the ring gear R2 'of the second planetary gear unit 16' are selectively engaged between the carrier C1 and the ring gear R2 '(with the carrier C1). The clutch CL is provided to connect and disconnect the ring gear R2 ′. The brake BK for selectively engaging (fixing) the ring gear R2 'with the housing 26 between the ring gear R2' of the second planetary gear device 16 'and the housing 26 which is a non-rotating member. Is provided.

  As shown in FIG. 20, in the driving device 130, the first planetary gear device 14 and the second planetary gear device 16 'are arranged coaxially with the input shaft 28, and the central axis CE. It arrange | positions in the position which opposes in the axial direction. That is, with respect to the axial direction of the central axis CE, the first planetary gear unit 14 is disposed closer to the engine 12 than the second planetary gear unit 16 ′. With respect to the axial direction of the central axis CE, the first electric motor MG1 is disposed closer to the engine 12 than the first planetary gear unit 14. With respect to the axial direction of the central axis CE, the second electric motor MG2 is disposed on the opposite side of the engine 12 with respect to the second planetary gear unit 16 ′. That is, the first electric motor MG1 and the second electric motor MG2 are arranged at positions facing each other with the first planetary gear device 14 and the second planetary gear device 16 ′ interposed therebetween with respect to the axial direction of the central axis CE. Yes. That is, in the drive device 130, the first electric motor MG1, the first planetary gear device 14, the clutch CL, the second planetary gear device 16 ', and the second electric motor are arranged from the engine 12 side in the axial direction of the central axis CE. These components are arranged on the same axis in the order of MG2 and brake BK. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 130 having such a configuration.

  FIG. 21 is a skeleton diagram illustrating a configuration of still another hybrid vehicle drive device 140 (hereinafter simply referred to as drive device 140) to which the present invention is preferably applied. In the driving device 140 shown in FIG. 21, with respect to the axial direction of the central axis CE, the second planetary gear device 16 ′, the clutch CL, and the brake BK sandwich the second electric motor MG2 therebetween, and The planetary gear unit 14 is disposed on the opposite side of the engine 12. The clutch CL and the brake BK are preferably provided at substantially the same position with respect to the axial direction of the central axis CE. That is, in the driving device 140, the first electric motor MG1, the first planetary gear device 14, the second electric motor MG2, the second planetary gear device 16 ′, the clutch from the engine 12 side in the axial direction of the central axis CE. These components are arranged coaxially in the order of CL and brake BK. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 140 having such a configuration.

  FIG. 22 is a skeleton diagram illustrating the configuration of still another hybrid vehicle drive device 150 (hereinafter simply referred to as drive device 150) to which the present invention is preferably applied. In the driving device 150 shown in FIG. 22, the configuration of the first electric motor MG1 and the second electric motor MG2 or the like, that is, the electric system is collectively arranged on the engine 12 side with respect to the axial direction of the central axis CE. The configuration of the second planetary gear device 16 ′, the first planetary gear device 14, the clutch CL, the brake BK, etc., that is, the mechanical system is collectively arranged on the opposite side of the engine 12 with respect to the configuration. The clutch CL and the brake BK are preferably provided at substantially the same position with respect to the axial direction of the central axis CE. That is, in the drive device 150, the first electric motor MG1, the second electric motor MG2, the second planetary gear device 16 ′, the first planetary gear device 14, the clutch in the axial direction of the central axis CE from the engine 12 side. These components are arranged coaxially in the order of CL and brake BK. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 150 having such a configuration.

  Thus, according to the present embodiment, the sun gear S1 as the first rotating element connected to the first electric motor MG1, the carrier C1 as the second rotating element connected to the engine 12, and the output that is the output rotating member. A first planetary gear device 14 as a first differential mechanism having a ring gear R1 as a third rotating element connected to the gear 30 and a sun gear S2 (S2 as a first rotating element connected to the second electric motor MG2). ′), A carrier C2 (C2 ′) as the second rotating element, and a ring gear R2 (R2 ′) as the third rotating element, and either one of the carrier C2 (C2 ′) or the ring gear R2 (R2 ′) Is a second planetary gear device 16 (16 ') which is a second differential mechanism connected to the ring gear R1 of the first planetary gear device 14, and a carrier in the first planetary gear device 14. 1 and a clutch CL that selectively engages one of the carrier C2 (C2 ') and the ring gear R2 (R2') that is not connected to the ring gear R1, and the carrier C2 (C2 ') And a brake BK that selectively engages the rotating element that is not connected to the ring gear R1 of the ring gear R2 (R2 ′) with respect to the housing 26 that is a non-rotating member, When the resonance of the power transmission system is detected or predicted, it is for switching the engagement state of at least one of the clutch CL and the brake BK. Therefore, when the resonance of the power transmission system is detected or predicted By changing the inertia balance of the power transmission system, the resonance point can be changed to suitably suppress the occurrence of resonance. That is, it is possible to provide the electronic control device 40 that is a drive control device for a hybrid vehicle that suppresses vibration of the power transmission system.

When the shift position of the hybrid vehicle is a stop position and the oil temperature T _OIL corresponding to the temperature of the power transmission system is equal to or lower than a predetermined threshold T _bo , the clutch CL and the brake BK Therefore, the resonance of the power transmission system can be detected or predicted in a practical manner, and the occurrence of resonance can be suitably suppressed.

From a predetermined relationship, on the basis of the vehicle speed V and the engine rotational speed N _E, wherein when the input variations of the drive train is detected or predicted, at least one of the engagement of the clutch CL and the brake BK Since the state is switched, the resonance of the power transmission system can be detected or predicted in a practical manner, and the occurrence of resonance can be suitably suppressed.

  The preferred embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Is.

  10, 100, 110, 120, 130, 140, 150: Hybrid vehicle drive device, 12: Engine, 14: First planetary gear device (first differential mechanism), 16, 16 ': Second planetary gear device ( (Second differential mechanism), 18, 22: stator, 20, 24: rotor, 26: housing (non-rotating member), 28: input shaft, 30: output gear (output rotating member), 32: oil pump, 40: Electronic control device (drive control device), 42: accelerator opening sensor, 44: engine rotation speed sensor, 46: MG1 rotation speed sensor, 48: MG2 rotation speed sensor, 50: output rotation speed sensor, 52: oil temperature sensor, 54: shift sensor, 56: engine control device, 58: inverter, 60: hydraulic control circuit, 62: damper, 64: differential gear device, 66: tire, 68: body, 70 Resonance determination unit, 72: P range cryogenic temperature determination unit, 74: Fluctuation input determination unit, 76: Resonance point change control unit, BK: Brake, CL: Clutch, C1, C2, C2 ': Carrier (second rotation element) , MG1: first motor, MG2: second motor, OWC: one-way clutch, P1, P2, P2 ′: pinion gear, R1, R2, R2 ′: ring gear (third rotation element), S1, S2, S2 ′: Sun gear (first rotating element)

As shown in FIG. 1, in the driving device 10, the first planetary gear device 14 and the second planetary gear device 16 are arranged coaxially with the input shaft 28 (on the central axis CE), and , Are arranged at positions facing each other in the axial direction of the central axis CE. That is, with respect to the axial direction of the central axis CE, the first planetary gear device 14 is disposed on the engine 12 side with respect to the second planetary gear device 16. With respect to the axial direction of the central axis CE, the first electric motor MG1 is disposed on the engine 12 side with respect to the first planetary gear unit 14. With respect to the axial direction of the central axis CE, the second electric motor MG2 is disposed on the opposite side of the engine 12 with respect to the second planetary gear device 16. That is, the first electric motor MG1 and the second electric motor MG2 are arranged at positions facing each other with the first planetary gear device 14 and the second planetary gear device 16 interposed therebetween with respect to the axial direction of the central axis CE. . That is, in the drive device 10, in the axial direction of the central axis CE, the first electric motor MG1, the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, Those components are arranged on the same axis in the order of the two electric motors MG2.

“EV-1” shown in FIG. 3 corresponds to mode 1 (traveling mode 1) in the driving device 10, and preferably the operation of the engine 12 is stopped and the second electric motor MG2 is stopped. Is an EV traveling mode used as a driving source for traveling. FIG. 4 is a collinear diagram corresponding to this mode 1, and will be described using this collinear diagram. When the clutch CL is released, the carrier C1 and the second planetary gear device 14 of the first planetary gear unit 14 are disengaged. The planetary gear device 16 can rotate relative to the carrier C2. Engagement of the brake BK causes the carrier C2 of the second planetary gear device 16 to be connected (fixed) to the housing 26, which is a non-rotating member, so that its rotational speed is zero. In this mode 1, in the second planetary gear device 16, the rotation direction of the sun gear S2 and the rotation direction of the ring gear R2 are opposite to each other, and negative torque (torque in the negative direction) is generated by the second electric motor MG2. Is output, the torque causes the ring gear R2, that is, the output gear 30, to rotate in the positive direction. That is, by outputting negative torque by the second electric motor MG2, the hybrid vehicle to which the drive device 10 is applied can be caused to travel forward. In this case, preferably, the first electric motor MG1 is idled. In this mode 1, the relative rotation of the carriers C1 and C2 is allowed, and EV travel control similar to EV travel in a vehicle equipped with a so-called THS (Toyota Hybrid System) in which the carrier C2 is connected to a non-rotating member. It can be performed.

FIG. 9 is a functional block diagram for explaining a main part of the control function provided in the electronic control unit 40. The resonance determination unit 70 shown in FIG. 9 determines resonance of the power transmission system in the hybrid vehicle to which the drive device 10 is applied. That is, the occurrence of resonance in the power transmission system is detected or predicted. Here, the power transmission system is a device related to power transmission from a driving source to driving wheels, that is, a so-called drive line. In a hybrid vehicle to which the driving device 10 is applied, the power transmission system is the driving source. The first planetary gear unit 14 and the second planetary gear provided in a power transmission path from the engine 12, the first electric motor MG1, the second electric motor MG2, and the like to the tire 66 as a driving wheel (see FIG. 12). The power transmission device includes the gear device 16, the input shaft 28, the output gear 30, the damper 62, the differential gear device 64, the tire 66, the body 68, and the like (see FIGS. 10 and 12).

FIG. 18 is a skeleton diagram illustrating a configuration of still another hybrid vehicle drive device 110 (hereinafter simply referred to as drive device 110) to which the present invention is preferably applied. In the drive device 110 shown in FIG. 18, the configuration of the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, etc., that is, the mechanical system is collectively related to the axial direction of the central axis CE. Arranged on the engine 12 side, the configurations of the first electric motor MG1 and the second electric motor MG2, etc., that is, the electrical system are collectively arranged on the opposite side of the engine 12 with respect to those configurations. That is, in the drive device 110, in the axial direction of the central axis CE, the first planetary gear device 14, the clutch CL, the second planetary gear device 16, the brake BK, the second electric motor MG2, Those components are arranged on the same axis in the order of one electric motor MG1. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 110 having such a configuration.

FIG. 19 is a skeleton diagram illustrating the configuration of still another hybrid vehicle drive device 120 (hereinafter simply referred to as drive device 120) to which the present invention is preferably applied. In the drive device 120 shown in FIG. 19, the carrier C2 is allowed to rotate in one direction with respect to the housing 26 between the carrier C2 of the second planetary gear device 16 and the housing 26 which is a non-rotating member, and reversely. A one-way clutch (one-way clutch) OWC that prevents rotation in the direction is provided in parallel with the brake BK. The one-way clutch OWC preferably allows relative rotation of the carrier C2 in the positive direction with respect to the housing 26, while preventing rotation in the negative direction. That is, in the driving state in which the carrier C2 is rotated in the negative direction, for example, when the second motor MG2 outputs a negative torque, the modes 1 to 3 are established without engaging the brake BK. Can do. The drive control device for a hybrid vehicle of the present invention is also suitably applied to the drive device 120 having such a configuration.

Claims (3)

A first differential mechanism including a first rotating element coupled to the first electric motor, a second rotating element coupled to the engine, and a third rotating element coupled to the output rotating member;
A first rotating element, a second rotating element, and a third rotating element connected to the second electric motor, and any one of the second rotating element and the third rotating element is a third rotation in the first differential mechanism. A second differential mechanism coupled to the element;
Of the second rotation element in the first differential mechanism, the second rotation element in the second differential mechanism, and the third rotation element that is not connected to the third rotation element in the first differential mechanism A clutch that selectively engages the element;
Of the second rotating element and the third rotating element in the second differential mechanism, the rotating element that is not connected to the third rotating element in the first differential mechanism is selectively engaged with the non-rotating member. And a brake to be combined,
A drive control device for a hybrid vehicle, wherein the engagement state of at least one of the clutch and the brake is switched when resonance of a power transmission system in the hybrid vehicle is detected or predicted.   When the shift position of the hybrid vehicle is a stop position and the temperature of the power transmission system is equal to or lower than a predetermined threshold, the engagement state of at least one of the clutch and the brake is switched. The drive control apparatus for a hybrid vehicle according to claim 1.   When a change input to the power transmission system is detected or predicted based on a vehicle speed and a rotational speed of the engine from a predetermined relationship, the engagement state of at least one of the clutch and the brake is switched. The drive control apparatus for a hybrid vehicle according to claim 1, which is a vehicle.

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