WO2016159120A1 - 制御装置 - Google Patents
制御装置 Download PDFInfo
- Publication number
- WO2016159120A1 WO2016159120A1 PCT/JP2016/060459 JP2016060459W WO2016159120A1 WO 2016159120 A1 WO2016159120 A1 WO 2016159120A1 JP 2016060459 W JP2016060459 W JP 2016060459W WO 2016159120 A1 WO2016159120 A1 WO 2016159120A1
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- WIPO (PCT)
- Prior art keywords
- torque
- combustion engine
- internal combustion
- control
- state
- Prior art date
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Definitions
- the present invention relates to a control device that controls a vehicle drive device provided with an engagement device, a rotating electrical machine, and a transmission device in order from the side of the internal combustion engine on a power transmission path connecting the internal combustion engine and wheels. .
- Patent Document 1 discloses a shock when performing start control for starting an internal combustion engine with the output torque of the rotating electrical machine in the electric travel state in which the vehicle is driven with the output torque of the rotating electrical machine with the engagement device released. Techniques for mitigating are described. Specifically, during start control of the internal combustion engine, the torque associated with the start of the internal combustion engine is controlled by controlling the shift engagement device of the transmission that is engaged to form the shift stage to the slip engagement state. It is described that the change is absorbed by the gear shift engagement device. In Patent Document 1, when a downshift of a transmission is required at the start of an internal combustion engine, a shift engagement device that controls to a slip engagement state to absorb torque fluctuation is disclosed by downshift. It is described to select the shifting engagement device to be released.
- the required torque of the wheel (which is required to be transmitted to the wheel is also required during the start control of the internal combustion engine and the downshift of the transmission in the electric running state. It is desirable to cause the rotating electrical machine to output a traveling torque having a magnitude corresponding to the required wheel torque so that a torque having a magnitude equal to that of the torque is transmitted to the wheels. Therefore, when performing the above-described start control of the internal combustion engine in the electric travel state, the rotating electrical machine is required to output a start torque for starting the internal combustion engine in addition to the travel torque.
- the start request of the internal combustion engine is generally generated under a situation where the wheel request torque is large. Therefore, when the start control of the internal combustion engine is performed in parallel with the downshift control as described above, the sum of the running torque, the start torque, and the inertia torque may exceed the maximum torque that can be output by the rotating electrical machine. . That is, by performing the start control of the internal combustion engine in parallel with the downshift control, the output torque of the rotating electrical machine is insufficient, which may affect the progress of the already started downshift operation.
- Patent Document 1 does not describe control when a request for starting the internal combustion engine is generated while downshifting is performed in the electric traveling state.
- the internal combustion engine can be started without greatly affecting the progress of the already started downshift operation. Realization of a simple control device is desired.
- control for a vehicle drive device provided with an engagement device, a rotating electrical machine, and a transmission device in order from the side of the internal combustion engine in the power transmission path connecting the internal combustion engine and the wheels.
- the characteristic configuration of the apparatus is that the start control for starting the internal combustion engine by the output torque of the rotating electrical machine via the engagement device is a first start control, and the output torque of the rotating electrical machine is in the released state of the engagement device.
- a downshift that changes the gear ratio by the transmission so that the gear ratio after the gear shift becomes larger than the gear ratio before the gear shift is set in the electric gear driving state while the driving state in which the vehicle is running is the electric driving state. If there is a request to start the internal combustion engine during the operation, the first start control is performed after the downshift is completed.
- the first start control when the start request for the internal combustion engine is generated during the downshift in the electric running state, and the first start control is performed, the first start control is performed after the end of the downshift. Start control is performed.
- the first start control in which the rotary electric machine is required to output the starting torque is not performed. Therefore, even when a request for starting the internal combustion engine is generated during downshifting in the electric running state, the already started downshift operation can be appropriately advanced.
- the internal combustion engine is started, for example, by the first start control at the time after the end of the change in the rotational speed of the rotating electrical machine for downshifting (that is, when the rotating electrical machine does not need to output an inertia torque).
- it can be performed by a method that does not require the output torque of the rotating electrical machine at a time point before that. In any case, it is possible to start the internal combustion engine without greatly affecting the progress of the downshift operation that has already started.
- the control device is a control device that controls a vehicle drive device.
- the control device 32 includes a drive control unit 30 and a vehicle control unit 34.
- drive coupling means a state where two rotating elements are coupled so as to be able to transmit a driving force.
- This concept includes a state where the two rotating elements are coupled so as to rotate integrally, and a state where the two rotating elements are coupled so as to be able to transmit the driving force via one or more transmission members.
- Such transmission members include various members (shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at different speeds, and an engagement device that selectively transmits rotation and driving force. (Such as a friction engagement device or a meshing engagement device) may be included.
- the “engagement state” is a state in which a transmission torque capacity is generated in the friction engagement device.
- the transmission torque capacity is the magnitude of the maximum torque that the friction engagement device can transmit by friction.
- the magnitude of the transmission torque capacity changes in proportion to the engagement pressure of the friction engagement device (pressure that presses the input-side engagement member and the output-side engagement member against each other).
- the “engagement state” there is no difference in rotational speed (slip) between the pair of engagement members of the friction engagement device (between the input side engagement member and the output side engagement member).
- a “sliding engagement state” in which there is a difference in rotational speed between the pair of engagement members of the friction engagement device.
- the “released state” is a state where no transmission torque capacity is generated in the friction engagement device.
- a transmission torque capacity may be generated by dragging the engagement members (friction members).
- drag torque is not considered in the classification of the engagement state, and the transfer torque capacity is generated by drag between the engagement members when a command for generating the transfer torque capacity is not issued.
- the state is also included in the “released state”.
- torque is transmitted between the pair of engagement members by friction between the pair of engagement members.
- torque slip torque
- torque having a magnitude of the transmission torque capacity is transmitted from the engagement member having a higher rotation speed to the engagement member having a lower rotation speed by dynamic friction.
- the torque acting between the pair of engagement members is transmitted by static friction with the magnitude of the transmission torque capacity as the upper limit.
- a vehicle 1 (hybrid vehicle) is provided with an internal combustion engine ENG, a vehicle drive device 2, and wheels W.
- the driving force transmission path is indicated by a solid line
- the signal and hydraulic pressure transmission path is indicated by a one-dot chain line
- the power transmission path is indicated by a double broken line.
- the vehicle drive device 2 includes an engagement device SSC, a rotating electrical machine MG, and a transmission device TM in order from the internal combustion engine ENG side in a power transmission path that connects the internal combustion engine ENG and the wheels W.
- the engagement device SSC is a friction engagement device.
- the internal combustion engine is a prime mover (for example, a gasoline engine, a diesel engine, or the like) that is driven by combustion of fuel inside the engine to extract power.
- the rotating electrical machine is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions as a motor and a generator as necessary.
- the vehicle drive device 2 causes the vehicle 1 to travel by transmitting the torque of at least one of the internal combustion engine ENG and the rotating electrical machine MG to the wheels W.
- the torque in the direction in which the vehicle 1 moves forward is a positive torque
- the torque in the opposite direction is a negative torque.
- the vehicle drive device 2 is configured such that the output torque of the internal combustion engine ENG is transmitted to the wheels W as a positive torque.
- a plurality of shift stages having different gear ratios are selectively formed by the transmission apparatus TM.
- the speed change device TM includes a plurality of speed change engagement devices (see FIG. 2).
- the vehicle drive device 2 includes an input member I and an output member O as shown in FIG.
- the input member I is a transmission member provided in a power transmission path between the engagement device SSC and the transmission device TM.
- the input member I is a shaft member that functions as an input shaft of the transmission apparatus TM.
- the output member O is a transmission member provided in a power transmission path between the transmission apparatus TM and the wheels W.
- the output member O is a shaft member that functions as an output shaft of the transmission apparatus TM.
- the power transmission path between the output member O and the wheels W is provided with an output differential gear device DF, and the rotation of the output member O is distributed to the two left and right wheels W via the output differential gear device DF. To be transmitted.
- the output shaft Eo (for example, crankshaft) of the internal combustion engine ENG is drivingly connected to the input member I via the engagement device SSC.
- the engagement device SSC is a clutch.
- the output shaft Eo and the input member I rotate together in a directly coupled state in which the engagement device SSC is directly coupled.
- the output shaft Eo of the internal combustion engine ENG is rotationally driven (cranked) by the torque of the rotating electrical machine MG transmitted via the engagement device SSC.
- the vehicle 1 is provided with a starter motor ST that is a dedicated rotating electric machine for starting the internal combustion engine ENG.
- the internal combustion engine ENG is driven by the torque of the starter motor ST.
- the output shaft Eo can also be rotationally driven.
- the rotating electrical machine MG is powered by receiving power supplied from the power storage device 36 or supplies the power storage device 36 with power generated (regenerated) by the torque of the internal combustion engine ENG or the inertial force of the vehicle 1.
- the rotating electrical machine MG includes a stator that is fixed to a non-rotating member such as a case, and a rotor that is drivingly connected to the input member I.
- the rotor of the rotating electrical machine MG rotates integrally with the input member I. Therefore, the rotating electrical machine MG (rotor) and the internal combustion engine ENG (output shaft Eo) rotate integrally with each other in the direct engagement state in which the engagement device SSC is directly coupled.
- the transmission TM shifts the rotation of the input member I (shift input shaft) and transmits it to the output member O (shift output shaft).
- the transmission TM is a stepped automatic transmission that can form a plurality of shift stages having different gear ratios.
- the transmission TM transmits the rotation of the input member I to the output member O after changing the speed of the input member I with a gear ratio corresponding to the formed gear.
- the “speed ratio” is a ratio of the rotational speed of the input member I to the rotational speed of the output member O, that is, a value obtained by dividing the rotational speed of the input member I by the rotational speed of the output member O.
- the speed change device TM includes a plurality of speed change engagement devices, and a plurality of speed stages having different speed ratios are formed according to the respective engagement states of the speed change engagement devices.
- two or more (two in this example) of the plurality of shift engagement devices are engaged and the other gears are released, and the shift stages of the respective stages are formed.
- the transmission TM is a first clutch C1, a second clutch C2, a third clutch C3, a first brake B1, a second brake B2, and A one-way clutch F (one-way clutch) is provided.
- Each of the shift engagement devices except the one-way clutch F is a friction engagement device.
- surface of FIG. 3 the gear stage of each stage is formed in the state which two of the some engaging apparatuses for a gear shift engaged, and others were released.
- the transmission apparatus TM includes six forward shift speeds having different gear ratios (first speed 1st, second speed 2nd, third speed 3rd, fourth speed 4th, fifth speed 5th, and sixth speed 6th).
- the transmission TM is configured by combining two differential gear devices, a first differential gear device PG1 and a second differential gear device PG2, as shown in FIG.
- the first differential gear device PG1 is configured by a single pinion type planetary gear mechanism having three rotating elements (first sun gear S1, first carrier CA1, and first ring gear R1).
- the first carrier CA1 meshes with the first sun gear S1 and supports a plurality of first pinion gears P1 that mesh with the first ring gear R1.
- the second differential gear device PG2 includes a Ravigneaux type planetary gear mechanism having four rotating elements (second sun gear S2, third sun gear S3, second carrier CA2, and second ring gear R2).
- the second carrier CA2 meshes with the second sun gear S2 and meshes with the second ring gear R2, and a plurality of second pinion gears P2 (long pinion gears) and a plurality of third pinion gears P3 meshed with the second pinion gear P2 and meshed with the third sun gear S3. (Short pinion gear).
- the first ring gear R1 is drivingly connected to the input member I, and is connected to rotate integrally with the input member I in this example.
- the second ring gear R2 is drivingly connected to the output member O, and is connected to rotate integrally with the output member O in this example.
- the first carrier CA1 is drivably coupled to the third sun gear S3 via the first clutch C1 and is drivably coupled to the second sun gear S2 via the third clutch C3.
- the first carrier CA1 rotates integrally with the third sun gear S3 in the direct engagement state in which the first clutch C1 is directly engaged, and the first clutch CA is in the direct engagement state in which the third clutch C3 is directly engaged.
- the carrier CA1 rotates integrally with the second sun gear S2.
- the first ring gear R1 is drivingly connected to the second carrier CA2 via the second clutch C2.
- the first ring gear R1 rotates integrally with the second carrier CA2 in the direct engagement state in which the second clutch C2 is directly engaged.
- the first sun gear S1 is fixed to the vehicle drive device 2 or the case 3 of the transmission TM (an example of a non-rotating member).
- the second sun gear S2 is selectively fixed to the case 3 by the first brake B1.
- the second carrier CA2 is selectively fixed to the case 3 by the second brake B2, and the direction of relative rotation with respect to the case 3 is limited to only one direction by the one-way clutch F.
- the second carrier CA2 whose rotation is restricted by the one-way clutch F receives the reaction force of the positive torque transmitted from the input member I to the third sun gear S3 via the first differential gear device PG1.
- the positive torque is transmitted to the output member O via the second ring gear R2.
- the rotation of the second carrier CA2 is not restricted by the one-way clutch F, and therefore the second brake B2 in addition to the first clutch C1. Are engaged.
- an internal combustion engine control device 31 is provided in addition to the control device 32 as a control device for controlling the state (traveling state, etc.) of the vehicle 1. Yes.
- the control device 32 and the internal combustion engine control device 31 include an arithmetic processing device such as a CPU as a core and a storage device such as a RAM and a ROM.
- Each function executed by the control device 32 and the internal combustion engine control device 31 is realized by software (program) stored in a storage device such as a ROM, hardware such as a separately provided arithmetic circuit, or both.
- the arithmetic processing unit included in the control device 32 and the internal combustion engine control device 31 operates as a computer that executes each program.
- the control device 32 and the internal combustion engine control device 31 are configured to be able to communicate with each other, share various information such as sensor detection information and control parameters, and perform cooperative control by exchanging various control signals. It is configured.
- One or both of the control device 32 and the internal combustion engine control device 31 may be configured by a set of a plurality of hardware (a plurality of separated hardware) that can communicate with each other. Further, the control device 32 and the internal combustion engine control device 31 may be configured to be provided in common hardware.
- the vehicle 1 is provided with various sensors, and the control device 32 is configured to be able to acquire detection information of the various sensors.
- an input rotation speed sensor Se1 detects the rotation speed of the input member I or the rotation speed of a member that rotates in synchronization with the input member I.
- synchronous rotation means rotating integrally or rotating at a proportional rotation speed.
- the output rotation speed sensor Se2 detects the rotation speed of the output member O or the rotation speed of a member that rotates in synchronization with the output member O.
- the engine rotation speed sensor Se3 detects the rotation speed of the internal combustion engine ENG (output shaft Eo) or the rotation speed of a member that rotates in synchronization with the internal combustion engine ENG (output shaft Eo).
- the control device 32 acquires the rotational speed of the input member I and the rotating electrical machine MG (rotor) based on the detection information of the input rotational speed sensor Se1, and the rotational speed and vehicle speed of the output member O based on the detection information of the output rotational speed sensor Se2.
- the rotation speed of the internal combustion engine ENG (output shaft Eo) is acquired based on the detection information of the engine rotation speed sensor Se3.
- the control device 32 via the internal combustion engine control device 31, detects information of the engine rotational speed sensor Se3 or the rotational speed of the internal combustion engine ENG (output shaft Eo) based on the detected information. Get information about.
- the accelerator opening sensor Se4 detects the accelerator opening according to the amount of depression of the driver's accelerator pedal.
- the brake operation sensor Se5 detects a brake operation amount corresponding to the depression amount of the driver's brake pedal.
- the shift position sensor Se6 detects the selected position of the shift lever.
- the shift lever is a lever operated by the driver to select one travel range from a plurality of travel ranges. To select the shift lever selection position (shift position), the position for selecting the forward travel range (D range), the position for selecting the reverse travel range (R range), and the neutral range (N range) , A position for selecting a parking range (P range), and the like.
- the power storage state sensor Se7 acquires a charge state or a power storage amount of the power storage device 36 that supplies power to the rotating electrical machine MG.
- the control device 32 (a vehicle control unit 34 to be described later in this example) is required to transmit to the wheels W based on sensor detection information such as the accelerator opening, the vehicle speed, the shift position, the charging state of the power storage device 36, and the like.
- sensor detection information such as the accelerator opening, the vehicle speed, the shift position, the charging state of the power storage device 36, and the like.
- wheel request torque vehicle request torque
- a travel mode of the vehicle 1 and a target gear stage to be formed in the transmission TM are determined.
- the engagement state of the engagement device SSC and each shift engagement device is determined by the drive control unit 30 (an engagement control unit 42 described later) included in the control device 32 according to the determined travel mode and the target shift speed. Be controlled.
- the travel mode includes an electric travel mode in which only the torque of the rotating electrical machine MG is transmitted to the wheels W to travel the vehicle 1, and an engine travel mode in which only the torque of the internal combustion engine ENG is transmitted to the wheels W to travel the vehicle 1. And a hybrid travel mode (parallel travel mode) in which the torque of both the rotating electrical machine MG and the internal combustion engine ENG is transmitted to the wheels W to travel the vehicle 1 is included.
- the engagement device SSC is controlled to the released state
- the engine travel mode and the hybrid travel mode the engagement device SSC is controlled to the engaged state.
- the electric traveling state is a state realized during traveling in the electric traveling mode.
- the control device 32 includes a drive control unit 30 and a vehicle control unit 34.
- the drive control unit 30 and the vehicle control unit 34 can communicate with each other.
- the drive control unit 30 and the vehicle control unit 34 may be provided in different hardware or in common hardware.
- the vehicle control unit 34 performs control for integrating various controls (torque control, engagement control, etc.) performed on the internal combustion engine ENG and the vehicle drive device 2 as a whole vehicle.
- the vehicle control unit 34 has a function of controlling the torque sharing of the entire vehicle. Specifically, the vehicle control unit 34 determines the internal combustion engine required torque and the rotary electrical machine required torque in consideration of the respective torque sharing ratios of the internal combustion engine ENG and the rotary electrical machine MG.
- the internal combustion engine required torque is a torque required for the internal combustion engine ENG as a torque output from the internal combustion engine ENG.
- the rotating electrical machine required torque is a torque required for the rotating electrical machine MG as a torque output from the rotating electrical machine MG.
- the rotating electrical machine required torque is set to a negative torque. Basically, each of the internal combustion engine required torque and the rotating electrical machine required torque is determined so that the sum of the internal combustion engine required torque and the rotating electrical machine required torque becomes equal to the wheel required torque.
- the internal combustion engine controller 31 controls the operation of the internal combustion engine ENG.
- the internal combustion engine control device 31 controls the internal combustion engine ENG so as to output the internal combustion engine required torque. Further, when there is a request for starting the internal combustion engine ENG from the vehicle control unit 34, the internal combustion engine control device 31 starts the internal combustion engine ENG by starting fuel supply or ignition to the internal combustion engine ENG, etc. When there is a stop request for the internal combustion engine ENG from the control unit 34, the internal combustion engine ENG is stopped by stopping fuel supply or ignition to the internal combustion engine ENG.
- the drive control unit 30 controls the state of engagement of the engagement device SSC and each shift engagement device, and controls the operation of the rotating electrical machine MG.
- the drive control unit 30 includes a rotating electrical machine control unit 41 that controls the operation of the rotating electrical machine MG and an engagement control unit 42 that controls the state of engagement of each engagement device so as to communicate with each other.
- Each of the rotating electrical machine control unit 41 and the engagement control unit 42 is configured by software (program) stored in a storage device, hardware such as a separately provided arithmetic circuit, or both.
- the rotating electrical machine control unit 41 controls the rotating electrical machine MG to output the rotating electrical machine required torque.
- the rotating electrical machine control unit 41 controls the output torque of the rotating electrical machine MG by controlling the inverter device 35 that converts the DC voltage of the power storage device 36 into an AC voltage and supplies the AC voltage to the rotating electrical machine MG.
- the engagement control unit 42 is a state in which the vehicle control unit 34 determines the engagement state of each engagement device (including the engagement device SSC and each shift engagement device) provided in the vehicle drive device 2. Control to be The engagement control unit 42 controls the engagement state of each engagement device so as to realize the travel mode determined by the vehicle control unit 34 and to form the target shift speed determined by the vehicle control unit 34. .
- the target shift speed is determined by the vehicle control unit 34 by referring to a shift map (not shown).
- the shift map is a map that defines the relationship between the accelerator opening and the vehicle speed, and the gear position in the transmission apparatus TM.
- a plurality of upshift lines and a plurality of downshift lines are defined.
- upshifting means changing the speed ratio of the transmission so that the speed ratio after the speed change becomes smaller than the speed ratio before the speed change.
- downshifting means changing the speed ratio of the transmission so that the speed ratio after the speed change becomes larger than the speed ratio before the speed change.
- the upshift is a change of the gear stage to the high speed side (side where the gear ratio is relatively reduced), and the downshift Is to change the gear position to the low speed side (the side where the gear ratio is relatively increased). That is, the upshift is to switch the shift speed formed in the transmission apparatus TM to a shift speed having a smaller gear ratio than the shift speed, and the downshift is a shift speed formed by the transmission apparatus TM. Switching the gear to a gear having a larger gear ratio than the gear.
- the engagement control unit 42 releases the disengagement-side engagement device, which is a gear shift engagement device that is released for gear shift switching, and performs gear shift switching when performing gear shift control that switches gear shift gears.
- a so-called change-over shift is performed in which an engagement-side engagement device that is a shift engagement device engaged is engaged.
- the engagement-side engagement device is an engagement device that is released before the start of the shift control and is engaged by the shift control.
- the disengagement-side engagement device is an engagement device that is engaged before the start of the shift control and released by the shift control.
- the disengagement-side engagement device includes a plurality of shift engagement units that are engaged to form a shift stage after a shift among a plurality of shift engagement apparatuses that are engaged to form a shift stage before a shift. It is set to a shift engagement device that is not common with the combined device.
- the engagement-side engagement device is a plurality of gears that are engaged to form a gear before shifting, among a plurality of gear engaging devices that are engaged to form a gear after shifting. It is set to a shift engagement device that is not common to the engagement device. For example, as shown in FIG. 3, when the shift stage before the shift is the third stage 3rd and the shift stage after the shift is the second stage 2nd, the third clutch C3 is set as the disengagement side engagement device, The brake B1 is set to the engagement side engagement device.
- the engagement device to be controlled by the engagement control unit 42 is a hydraulically driven friction engagement device.
- the engagement control unit 42 controls the state of each engagement of the engagement device by controlling the hydraulic pressure supplied to each of the engagement devices via the hydraulic control device PC.
- the engagement pressure of each engagement device changes in proportion to the magnitude of the hydraulic pressure supplied to the engagement device. That is, the magnitude of the transmission torque capacity generated in the engagement device changes in proportion to the magnitude of the hydraulic pressure supplied to the engagement device.
- the engagement state of each engagement device is controlled to one of a direct engagement state, a slip engagement state, and a release state according to the supplied hydraulic pressure.
- the hydraulic control device PC includes a hydraulic control valve (such as a linear solenoid valve) for adjusting the hydraulic pressure of hydraulic oil supplied from an oil pump (not shown).
- the oil pump is, for example, a mechanical pump driven by a rotating member provided in the vehicle drive device 2 such as the output shaft Eo or the output member O, an electric pump driven by a dedicated rotating electrical machine, or the like.
- the hydraulic pressure control device PC adjusts the opening degree of the hydraulic pressure control valve in accordance with the hydraulic pressure command from the engagement control unit 42, thereby supplying hydraulic fluid corresponding to the hydraulic pressure command to each engagement device.
- the vehicle control unit 34 determines that there is a request for starting the internal combustion engine ENG when an internal combustion engine start condition, which is a condition for starting the internal combustion engine ENG, is satisfied, and cooperates with the internal combustion engine control device 31 and the drive control unit 30.
- the start control of the internal combustion engine ENG is performed by operation.
- the internal combustion engine start condition is satisfied when the vehicle 1 is in a situation that requires the torque of the internal combustion engine ENG. For example, when the driver depresses the accelerator pedal strongly while the vehicle 1 is stopped or while driving in the electric driving mode, the internal combustion engine is started when the wheel required torque cannot be obtained only by the rotating electrical machine MG.
- the condition is met.
- the internal combustion engine start condition is also satisfied when it is necessary to start the internal combustion engine ENG and charge the power storage device 36.
- the start control of the internal combustion engine ENG performed by the vehicle control unit 34 includes first start control.
- the first start control is start control for starting the internal combustion engine ENG by the output torque of the rotating electrical machine MG via the engagement device SSC.
- the internal combustion engine ENG is rotated by the output torque of the rotating electrical machine MG transmitted via the engagement device SSC in the slip engagement state.
- the engagement control unit 42 increases the engagement pressure of the engagement device SSC from zero to change the engagement device SSC from the released state to the sliding engagement state. Transition.
- slip torque (starting torque Ts) having a magnitude corresponding to the engagement pressure (transmission torque capacity) of the engagement device SSC is transmitted to the internal combustion engine ENG, and the rotational speed of the internal combustion engine ENG increases.
- the internal combustion engine control device 31 starts fuel supply and ignition to the internal combustion engine ENG to start combustion of the internal combustion engine ENG.
- the engagement control unit 42 raises the engagement pressure of the engagement device SSC to the complete engagement pressure, and shifts the engagement device SSC to the direct engagement state.
- the complete engagement pressure is an engagement pressure that can maintain an engagement state without slipping (direct engagement state) even if the torque transmitted to the engagement device fluctuates.
- the start control of the internal combustion engine ENG performed by the vehicle control unit 34 includes the second start control in addition to the first start control.
- the second start control is start control for starting the internal combustion engine ENG by the output torque of the starter motor ST.
- the internal combustion engine ENG is rotated by the output torque of the starter motor ST.
- the vehicle control unit 34 performs the second start control, the internal combustion engine control device 31 supplies electric power to the starter motor ST to rotate the internal combustion engine ENG, and starts fuel supply and ignition to the internal combustion engine ENG.
- combustion of the internal combustion engine ENG is started.
- the engagement control unit 42 increases the engagement pressure of the engagement device SSC from zero, and shifts the engagement device SSC from the released state to the directly connected state.
- the start torque Ts is transmitted from the rotating electrical machine MG side to the internal combustion engine ENG side via the engagement device SSC. Therefore, in order to transmit a torque having the same magnitude as the wheel required torque to the wheel W even during the first start control, the rotating electrical machine MG has a travel torque (a wheel corresponding to the wheel required torque). In addition to the driving torque, it is necessary to output the starting torque Ts. In view of this point, in the present embodiment, the control device 32 is necessary to perform the first start control from the maximum torque Tmax that can be output by the rotating electrical machine MG, in the electric running state.
- the output torque of the rotating electrical machine MG in the electric travel state is set to be equal to or less than the allowable torque Ta, which is a torque obtained by subtracting the starting torque Ts from the maximum torque Tmax.
- the “output torque of the rotating electrical machine MG in the electric running state” here does not include the starting torque Ts or the inertia torque Ti. That is, the “electric running state” here is an electric running state in which the first start control and the downshift control are not performed.
- the vehicle control unit 34 is configured to determine a rotating electrical machine required torque having a magnitude equal to or smaller than the allowable torque Ta when determining the rotating electrical machine required torque in the electric travel state.
- the magnitude of the torque (starting torque Ts) transmitted from the rotating electrical machine MG side to the internal combustion engine ENG side via the engagement device SSC can change during the first starting control, for example,
- the maximum starting torque Ts required during the first starting control is subtracted from the maximum torque Tmax to determine the allowable torque Ta, or the starting torque required during the first starting control.
- the allowable torque Ta can be determined by subtracting the average value of Ts from the maximum torque Tmax.
- the maximum torque Tmax that can be output by the rotating electrical machine MG generally changes according to the rotational speed of the rotating electrical machine MG, and therefore the size of the allowable torque Ta also depends on the rotational speed of the rotating electrical machine MG. Will change accordingly.
- the allowable torque Ta is set to the amount of charge (charged state) of the power storage device 36. It may be variably set according to the above.
- the rotating electrical machine MG needs to output torque for other applications in addition to the running torque
- downshifting is performed in the electric running state in addition to the situation where the first start control is performed.
- the rotating electrical machine MG has a gear ratio by downshifting in addition to the running torque. It is necessary to output an inertia torque Ti for changing the rotation speed of the rotating electrical machine MG by an amount corresponding to the change amount.
- the inertia torque Ti is a torque having a magnitude obtained by multiplying the moment of inertia of the rotating electrical machine MG (rotor) by the rate of change (rotational acceleration) of the rotational speed of the rotating electrical machine MG (rotor). Therefore, for example, when there is a request for starting the internal combustion engine ENG during downshifting in the electric running state and the first start control is performed in parallel with the downshift control, the starting torque Ts is added to the running torque.
- the rotary electric machine MG is required to output both of the torque and inertia torque Ti.
- the magnitude of the running torque at that time is often close to the allowable torque Ta. It is expected to be. Then, when the magnitude of the running torque is close to the allowable torque Ta, the sum of the running torque, the starting torque Ts, and the inertia torque Ti exceeds the maximum torque Tmax as shown by the broken line in FIG. That is, by performing the first start control in parallel with the downshift control, the output torque of the rotating electrical machine MG is insufficient, which may affect the progress of the already started downshift operation.
- FIG. 4 shows an example where the magnitude of the inertia torque Ti is smaller than the starting torque Ts.
- the target change rate of the rotational speed of the internal combustion engine ENG in the first starting control and downshift control are shown.
- the magnitude of the inertia torque Ti may be larger than the starting torque Ts.
- the vehicle control unit 34 (the control device 32), when there is a request for starting the internal combustion engine ENG while performing the downshift in the electric travel state, until the downshift ends.
- the first start control is not performed (that is, the first start control is prohibited). That is, the vehicle control unit 34 is configured not to perform the first start control while the rotating electrical machine MG needs to output the inertia torque Ti.
- the vehicle control unit 34 (the control device 32) is in the case where there is a request for starting the internal combustion engine ENG while performing the downshift in the electric travel state, and when performing the first start control, The first start control is performed after the downshift is completed.
- the vehicle control unit 34 (the control device 32) rotates for downshifting when there is a request for starting the internal combustion engine ENG while downshifting in the electric running state.
- the first start control is not performed until the rotational speed change of the rotating electrical machine MG due to the output torque of the electrical machine MG (hereinafter referred to as “rotational speed change of the rotating electrical machine MG for downshifting”) is completed.
- the vehicle control unit 34 (the control device 32) is in the case where there is a request for starting the internal combustion engine ENG while performing the downshift in the electric travel state, and when performing the first start control,
- the first start control is performed after the rotation speed change of the rotating electrical machine MG for downshifting is completed.
- the rotational speed change of the rotating electrical machine MG for downshifting is performed by the output torque of the rotating electrical machine MG, and the amount of change in rotational speed at this time is the amount of change in the gear ratio of the gear stage before and after the downshift. It depends on your needs.
- the start control of the internal combustion engine ENG performed by the vehicle control unit 34 includes the second start control in addition to the first start control.
- the vehicle control unit 34 determines that the torque responsiveness request is a high response request when there is a start request for the internal combustion engine ENG while downshifting in the electric travel state. If the torque response request is in the low response request state, the second start control is performed in the state, and the first start control is performed after the rotation speed change of the rotating electrical machine MG for downshifting is completed. It is configured as follows.
- the second start control is a start control of the internal combustion engine ENG that does not require the output torque of the rotating electrical machine MG.
- the second start control can be started without waiting for the end of the rotation speed change of the rotating electrical machine MG for the downshift.
- the torque responsiveness request is a request for responsiveness to the torque (wheel transmission torque) transmitted to the wheel W.
- the low response request state is a state in which the request for responsiveness is lower than the high response request state.
- the responsiveness here refers to the time from when an operation (for example, operation of an accelerator pedal) for changing the wheel request torque by the driver is performed until the change in the wheel request torque is reflected in the wheel transmission torque. The responsiveness increases as the time becomes shorter.
- the torque responsiveness request is determined based on, for example, at least one of the accelerator opening, the change rate of the accelerator opening, the vehicle mode, and the vehicle speed. Regarding the accelerator opening, the change rate of the accelerator opening, and the vehicle speed, the torque response requirement is determined so as to increase as they increase.
- the torque responsiveness request is determined according to the degree of torque responsiveness corresponding to the vehicle mode (for example, normal mode, sports mode, etc.) selected by the driver.
- the torque response request is expressed by a numerical value (index) that increases as the degree of request increases, a state where the numerical value is equal to or greater than a threshold value is a high response required state, and the numerical value is less than the threshold value Can be in a low response request state.
- the vehicle control unit 34 ends the change in the rotational speed of the rotating electrical machine MG for downshifting when there is a request to start the internal combustion engine ENG while downshifting in the electrically driven state. Until this time, the first start control is not performed.
- “the first start control is not performed” means that the transmission torque of the engagement device SSC increases (basically from zero until the change in the rotational speed of the rotating electrical machine MG for downshifting is completed. Does not start, and does not exclude a configuration in which the supply of hydraulic pressure to the engagement device SSC is started until the rotation speed change ends.
- the vehicle control unit 34 (the control device 32) performs the first start control when there is a request for starting the internal combustion engine ENG while performing the downshift in the electric travel state. In such a case, the first start control is performed after the rotation speed change of the rotating electrical machine MG for downshifting is completed. In addition, when the vehicle control unit 34 is requested to start the internal combustion engine ENG while downshifting in the electric running state, and the torque response request is in the low response request state, the vehicle control unit 34 performs the downshift. Therefore, the first start control is performed after the rotation speed change of the rotating electrical machine MG is completed.
- performing the first start control means that the increase in the transmission torque of the engagement device SSC is started after the end of the rotational speed change, and until the end of the rotational speed change.
- the configuration for starting the supply of hydraulic pressure to the engagement device SSC is not excluded.
- the vehicle control unit 34 performs the above-described control when there is a request to start the internal combustion engine ENG while downshifting in the electric travel state.
- the travel torque is a negative torque
- the shortage of output torque of the rotating electrical machine MG as described above hardly occurs.
- the vehicle control unit 34 may be configured to perform the above-described control only when there is a request for starting the internal combustion engine ENG while performing the on-down shift in the electric traveling state. it can.
- the on / down shift is a down shift in a state in which torque in the forward acceleration direction is transmitted to the wheel W (travel torque is a positive torque).
- the first start control can be started before the end of the rotation speed change.
- the vehicle control unit 34 performs the first start control or the second start control in addition to the above case. That is, in the present embodiment, the first start control is started when there is a start request for the internal combustion engine ENG while the vehicle is in the electric travel state and is not downshifted. While the downshift is not performed, the inertia torque TI is not output by the rotating electrical machine MG. Therefore, even if the starting torque Ts associated with the first starting control is output to the rotating electrical machine MG in addition to the running torque, the shortage of the output torque of the rotating electrical machine MG as described above hardly occurs. Therefore, when the downshift is not performed, the first start control is preferably started immediately after the start request for the internal combustion engine ENG is made. As a result, the internal combustion engine ENG can be quickly started when the downshift is not performed.
- the vehicle control unit 34 performs the first start control or the second start control depending on whether the torque responsiveness request is in a low response request state or a high response request state.
- the vehicle control unit 34 is in the case where there is a request for starting the internal combustion engine ENG while it is in the electric running state and is not downshifting, and the torque response request is in the low response request state.
- the first start control is started, and the second start control is started when the torque responsiveness request is in the high response request state.
- the maximum output torque Tmax of the rotating electrical machine MG can be used as the running torque when the torque response request is in the high response request state.
- the internal combustion engine ENG is started by the output torque of the starter motor ST by performing the second start control.
- the rotating electrical machine MG need not bear the start torque Ts and the inertia torque Ti. Therefore, the maximum output torque Tmax possessed by the rotating electrical machine MG can be used as the running torque, and a higher required wheel torque can be met.
- the vehicle control unit 34 (control device 32) performs a start control selection process for selecting start control of the internal combustion engine ENG according to the procedure shown in FIG.
- FIG. 5 is a flowchart showing a start control selection process during downshifting in the electric travel state.
- the vehicle control unit 34 determines whether or not a start request for the internal combustion engine ENG has been generated during the downshift in the electric travel state (step # 01: Yes) until the downshift is completed (step # 03: No). Monitor (step # 02). When there is a request for starting the internal combustion engine ENG (step # 02: Yes), processing for selecting one of the first start control and the second start control is performed.
- step # 04 it is determined whether or not the rotation speed change of the rotating electrical machine MG for downshift has been completed (step # 04), and whether or not the torque responsiveness request is in a high response request state (step # 04).
- step # 04 if the positive determination is made first (step # 04: Yes), the first start control is selected (step # 06).
- step # 07 the second start control is selected (step # 07).
- the first start control is selected. Further, when the start request of the internal combustion engine ENG is requested, the rotation speed change of the rotating electrical machine MG for downshifting is not completed, and until the rotation speed change of the rotating electrical machine MG for downshifting is completed. If the torque response request is not in the high response request state, the first start control is selected. On the other hand, when the rotational speed change of the rotating electrical machine MG for downshifting has not been completed when the start request of the internal combustion engine ENG has been requested, and the torque responsiveness request at that time is in a high response request state The second start control is selected.
- the second start control is selected.
- step # 5: No the first start control can be selected.
- the first start control is selected instead of the second start control. This is different from the example shown in FIG.
- the vehicle control unit 34 (the control device 32) performs the start for selecting the start control of the internal combustion engine ENG according to the procedure shown in FIG. 6 while the downshift is not performed in the electric travel state. Perform control selection processing.
- FIG. 6 is a flowchart showing a start control selection process while the downshift is not performed in the electric travel state.
- the vehicle control unit 34 monitors whether or not a start request for the internal combustion engine ENG has been generated (step # 09) while the downshift in the electric travel state is not performed (step # 08: No). If there is a request for starting the internal combustion engine ENG (step # 09: Yes), it is determined whether or not the torque responsiveness request is in a high response request state (step # 10).
- step # 10: No When the torque responsiveness request is not in the high responsiveness request state, that is, in the low responsiveness request state (step # 10: No), the first start control is selected (step # 11). When the torque response request is in the high response request state (step # 10: Yes), the second start control is selected (step # 12).
- FIG. 7 shows a specific example in the case where there is a request for starting the internal combustion engine ENG while downshifting in the electric running state, and the first start control is performed after completion of the change in the rotational speed of the rotating electrical machine MG for downshifting.
- FIG. 9 is a time chart showing a specific example in the case where there is a request for starting the internal combustion engine ENG during the downshift in the electric running state and the second start control is performed.
- FIG. 8 is a time chart showing a comparative example.
- the traveling mode is set to the electric traveling mode until time T01, and the vehicle 1 is traveling by the output torque of the rotating electrical machine MG with the engagement device SSC released. Further, the rotation of the internal combustion engine ENG is stopped, and the rotating electrical machine MG outputs a positive torque (running torque) having a magnitude corresponding to the wheel required torque.
- the target gear position is changed to the low speed side, and the downshift control (on-downshift control in this example) is started at the time T01.
- the adjustment of the hydraulic pressure command of the engagement side engagement device is started at time T01 so that the engagement pressure of the engagement side engagement device increases from zero to the engagement side preliminary pressure.
- the adjustment of the hydraulic pressure command of the disengagement side engagement device is started at a time between time T01 and time T02 so that the engagement pressure of the disengagement side engagement device decreases from the complete engagement pressure to the minimum engagement pressure.
- the engagement side preliminary pressure is an engagement pressure during standby before the engagement side engagement device is engaged.
- the engagement-side preliminary pressure is set to a stroke end pressure that is an engagement pressure for positioning the piston at the stroke end position, or a pressure that is smaller than the stroke end pressure by a predetermined pressure.
- the minimum engagement pressure is a lower limit engagement that can maintain the disengagement side engagement device in the direct engagement state in a state where the traveling torque having a magnitude corresponding to the wheel required torque output by the rotating electrical machine MG is transmitted. Pressure.
- the start request for the internal combustion engine ENG is generated at a time between time T01 and time T02, and the torque until the end time (time T03) of the rotational speed change of the rotating electrical machine MG for downshifting is reached.
- time T03 the first start control is performed after the end of the change in rotational speed of the rotating electrical machine MG for downshifting (after time T03). Therefore, during the inertia phase control started at time T02, the rotating electrical machine MG does not need to output the starting torque Ts, and the inertia torque TI output in addition to the running torque by the rotating electrical machine MG is used for downshifting.
- the disengagement side engagement device shifts from the direct engagement state to the slip engagement state, and the rotation speed of the rotating electrical machine MG starts to increase from the pre-shift synchronous rotation speed Wbf.
- the hydraulic pressure command of the disengagement side engagement device after the transition to the slip engagement state is adjusted so that the transmission torque capacity of the disengagement side engagement device becomes a magnitude corresponding to the required wheel torque.
- the synchronous rotation speed Wbf before the shift is the rotation speed of the input member I in a state where all of the shift engagement devices that are engaged to form the shift stage before the shift are directly connected, This coincides with the rotational speed obtained by multiplying the rotational speed of O by the speed ratio of the gear stage before the gear shift.
- the post-shift synchronous rotation speed Waf is the rotational speed of the input member I in a state where all the shift engagement devices that are engaged to form the post-shift gear stage are directly engaged, and the output member O Is equal to the rotation speed obtained by multiplying the rotation speed by the speed ratio of the speed stage after the shift.
- control rotational speed control
- control is performed to control the output torque of the rotating electrical machine MG to bring the rotational speed of the rotating electrical machine MG closer to the target rotational speed.
- the torque phase is controlled after time T03, which is the time after the end of the inertia phase control.
- the hydraulic pressure command of the release-side engagement device is adjusted so that the engagement pressure of the release-side engagement device decreases toward zero, and the engagement pressure of the engagement-side engagement device is completely engaged.
- the hydraulic pressure command of the engagement side engagement device is adjusted so that the pressure gradually increases to the combined pressure.
- the torque ratio gradually decreases as the engagement pressure of the engagement-side engagement device increases.
- the torque ratio is relative to the transmission device TM with respect to the output torque output from the transmission device TM to the wheel W side of the power transmission path (in this example, the torque output from the transmission device TM to the output member O).
- the torque phase control is started at a time between time T03 and time T04, and the torque phase control is ended at time T05.
- the control device 32 when performing the first start control, the control device 32 is engaged within a period during which a change in torque ratio due to downshift occurs (that is, within a period during which torque phase control is performed).
- the engagement device SSC is configured to be controlled so that the transmission torque of the device SSC starts to increase.
- the timing at which the transmission torque of the engagement device SSC starts to rise generally coincides with the timing at which the rotational speed of the internal combustion engine ENG starts to rise.
- the adjustment of the hydraulic pressure command of the engagement device SSC is started from a time slightly before time T03 so that the transmission torque of the engagement device SSC starts to increase at time T04.
- the engagement device SSC is shifted from the released state to the sliding engagement state.
- the rotational speed of the internal combustion engine ENG starts to increase due to the starting torque Ts transmitted from the rotary electric machine MG side to the internal combustion engine ENG side via the engagement device SSC in the slip engagement state.
- the rotary electric machine MG does not need to output the inertia torque Ti, the shortage of the output torque of the rotary electric machine MG as described above hardly occurs.
- the hydraulic pressure command of the engagement device SSC in the sliding engagement state is adjusted so that the transmission torque capacity of the engagement device SSC becomes a magnitude corresponding to the set starting torque Ts.
- the engagement pressure of the engagement device SSC is increased after the combustion of the internal combustion engine ENG is started so as not to prevent the increase in the rotational speed of the internal combustion engine ENG after the combustion of the internal combustion engine ENG. Once lowered, the engagement pressure of the engagement device SSC is increased to the full engagement pressure. Further, in the example shown in FIG. 7, by shifting the engagement device SSC from the sliding engagement state to the direct engagement state in a state where the rotation speed of the internal combustion engine ENG is higher than the rotation speed of the rotating electrical machine MG, The torque transmission direction is prevented from reversing before and after the direct engagement of the engagement device SSC.
- the engagement device SSC may be controlled such that the transmission torque of the engagement device SSC begins to increase at a later point in time during which the change in the torque ratio due to the shift occurs.
- the rotating electrical machine for the downshift is used. Since the first start control is performed after the change in the rotation speed of the MG, the rotary electric machine MG does not need to output both the inertia torque Ti and the start torque Ts in addition to the running torque, and has already started.
- the internal combustion engine ENG can be started without significantly affecting the progress of the downshift operation.
- a shock is generated as a result of not performing such control and the downshift operation already started is affected by the start control of the internal combustion engine ENG will be described with reference to FIG.
- the time T11 in FIG. 8 corresponds to the time T01 in FIG. That is, in the comparative example shown in FIG. 8, the downshift control is started at time T11.
- the first start control is performed without waiting for the end of the rotation speed change of the rotating electrical machine MG in response to the start request of the internal combustion engine ENG generated between the time T11 and the time T12. . Therefore, in this comparative example, between time T11 and time 12, adjustment of the hydraulic pressure command for shifting the engagement device SSC from the released state to the sliding engagement state is started, and control of the inertia phase is started.
- the engagement device SSC has shifted to the sliding engagement state.
- the rotating electrical machine MG needs to output both the inertia torque Ti and the starting torque Ts in addition to the running torque.
- the sum of the running torque, the start torque Ts, and the inertia torque Ti tends to exceed the maximum torque Tmax.
- Tmax the maximum torque
- FIG. 9 shows a specific example according to the present embodiment when there is a request for starting the internal combustion engine ENG during the downshift in the electric running state and the second start control is performed in response to the start request.
- time T21 corresponds to time T01 in FIG. That is, also in the specific example shown in FIG. 9, the downshift control is started at time T21.
- the start request of the internal combustion engine ENG is generated between the time T21 and the time T22, and the torque responsiveness request at that time is in the high response request state.
- 2nd starting control is assumed.
- FIG. 9 shows a specific example according to the present embodiment when there is a request for starting the internal combustion engine ENG during the downshift in the electric running state and the second start control is performed in response to the start request.
- the second start control is started immediately after the start request of the internal combustion engine ENG is generated, and at the time T22 when the inertia phase control is started, the rotational speed of the internal combustion engine ENG is increased by the torque of the starter motor ST. It is starting to rise.
- the rotational speed of the internal combustion engine ENG is higher than the rotational speed of the rotating electrical machine MG. It has become.
- the hydraulic pressure command of the engagement device SSC for increasing the engagement pressure of the engagement device SSC to the full engagement pressure is adjusted, and the engagement device SSC is shifted from the released state to the directly connected state.
- the vehicle control unit 34 when the vehicle control unit 34 (the control device 32) makes a start request for the internal combustion engine ENG while performing a downshift in the electric travel state, the torque responsiveness request is high. In the response request state, the second start control is performed. In the case where the torque responsiveness request is in the low response request state, the first start control is performed after the end of the change in the rotational speed of the rotating electrical machine MG for the downshift.
- the configuration for performing the above has been described as an example. However, the embodiment of the present invention is not limited to this, and when the vehicle control unit 34 makes a start request for the internal combustion engine ENG while performing a downshift in the electric traveling state, a request other than a torque response request is made.
- the index may be configured to determine whether to perform the second start control or to perform the first start control after the end of the change in the rotational speed of the rotating electrical machine MG for downshifting. For example, based on the reason why the internal combustion engine start condition is satisfied, when the vehicle control unit 34 satisfies the internal combustion engine start condition in order to increase the wheel transmission torque, the vehicle control unit 34 performs the second start control and causes the rotating electrical machine MG to generate power. Therefore, when the internal combustion engine start condition is satisfied, the first start control may be performed after the change in the rotation speed of the rotating electrical machine MG for downshifting is completed.
- the vehicle drive device 2 to be controlled by the control device 32 is connected to the engagement device SSC in order from the internal combustion engine ENG side to the power transmission path connecting the internal combustion engine ENG and the wheels W.
- the vehicle drive device 2 having another configuration may be controlled.
- a clutch CL is provided in the power transmission path between the rotating electrical machine MG and the transmission TM, and the clutch CL is connected to the input member I and the input shaft (intermediate shaft M) of the transmission TM.
- the vehicle drive device 2 may be a control target.
- the case where the vehicle drive device 2 including a stepped automatic transmission is used as the transmission device TM is described as an example of control.
- a dual clutch type transmission called a so-called DCT (Dual Clutch Transmission) is used.
- a vehicle control device including another type of transmission such as a device may be a control target.
- both the engagement device SSC and the shift engagement device are hydraulic drive engagement devices
- a driving force other than hydraulic pressure for example, an electromagnet driving force, a servo motor driving force, or the like.
- a combined device may be used.
- both the engagement device SSC and the shift engagement device reduce the supply hydraulic pressure (hydraulic pressure command) to reduce the transmission torque capacity (engagement).
- the case of a normally open type engaging device in which the pressure is reduced has been described as an example.
- one or both of the engaging device SSC and the shifting engaging device are engaged by spring pressure or the like, and the supply hydraulic pressure (hydraulic pressure)
- the normally closed engagement device in which the transmission torque capacity (engagement pressure) decreases by increasing the command) may be used.
- each speed stage is formed by controlling two of the plurality of speed change engagement devices to the engaged state.
- the transmission apparatus TM is configured to be capable of forming six shift stages with different transmission ratios as the forward shift stage has been described as an example.
- the transmission apparatus TM can be formed.
- the number of forward shift speeds may be other than “6” (eg, “8”).
- the transmission TM is a so-called CVT (Continuously Variable Variable Transmission). It is also possible to control a vehicle control device including a continuously variable automatic transmission that is called as a control target. Note that downshift in this case simply means changing the gear ratio after the shift to be larger than the gear ratio before the shift.
- An engagement device (SSC), a rotating electrical machine (MG), and a transmission device (TM) are connected to a power transmission path connecting the internal combustion engine (ENG) and the wheels (W) in order from the internal combustion engine (ENG) side.
- the starting control for starting the vehicle is the first starting control, and the driving state in which the vehicle (1) is driven by the output torque of the rotating electrical machine (MG) in the released state of the engagement device (SSC) is the electric driving state.
- TM speed change device
- the end of the downshift is completed.
- the first start control is performed later.
- the rotary electric machine (MG) is required to output an inertia torque (Ti) for changing the rotation speed of the rotary electric machine (MG), it is necessary to output the starting torque (Ts).
- the first start control required for) is not performed. Therefore, even when a start request for the internal combustion engine (ENG) is generated while downshifting is performed in the electric traveling state, the already started downshift operation can be appropriately advanced.
- the internal combustion engine (ENG) is started by, for example, a time point after the end of the rotational speed change of the rotating electrical machine (MG) for downshifting (that is, the rotating electrical machine (MG) needs to output an inertia torque (Ti). It is possible to carry out by the first start control at a time point where there is no) or by a method that does not require the output torque of the rotating electrical machine (MG) at a time point before that. In any case, the internal combustion engine (ENG) can be started without greatly affecting the progress of the downshift operation that has already started.
- the end of the downshift is after the end of the rotation speed change of the rotating electrical machine (MG) due to the output torque of the rotating electrical machine (MG) for downshifting.
- the first start control can be performed after the rotating electrical machine (MG) does not need to output the inertia torque (Ti) for downshifting. Therefore, the internal combustion engine (ENG) can be started without significantly affecting the progress of the already started downshift operation.
- the rotating electrical machine in the power transmission path with respect to the transmission (TM) with respect to the output torque output from the transmission (TM) to the wheel (W) side of the power transmission path (MG)
- the engagement device (SSC) controlling the engagement device (SSC) so that the transmission torque of the engagement device (SSC) starts to increase.
- the engagement device (SSC) In order to transfer the starting torque (Ts) from the rotating electrical machine (MG) to the internal combustion engine (ENG), when the engagement device (SSC) is shifted from the release state to the slip engagement state, the engagement device (SSC) At the timing when the transmission torque starts to rise, the torque transmitted to the wheel (W) (wheel transmission torque) may vary.
- the timing at which such fluctuations in the wheel transmission torque can occur can be included in a period in which the torque ratio changes due to the downshift. Note that, during a period in which the torque ratio changes, generally, the magnitude of the wheel transmission torque changes in accordance with the change in the torque ratio. Therefore, even if the wheel transmission torque fluctuates at the above timing, the fluctuation can be confused with the change in the wheel transmission torque accompanying the change in the torque ratio. It is possible to reduce the uncomfortable feeling.
- the first start control when there is a request for starting the internal combustion engine (ENG) while the electric running state is not performed and the downshift is not performed.
- the start control for starting the internal combustion engine (ENG) by the output torque of the starter motor (ST) is the second start control, and the internal combustion engine is performed while the downshift is performed in the electric travel state.
- the engine (ENG) is requested to start, if the torque responsiveness request, which is a request for responsiveness to the torque transmitted to the wheel (W), is in the high response request state, the second start control.
- the torque response request is a low response request state in which the request for the response is lower than the high response request state, it is preferable to perform the first start control.
- This configuration requires the output torque of the rotating electrical machine (MG) without waiting for the end of the rotational speed change of the rotating electrical machine (MG) for downshifting when the torque responsiveness request is in a high response request state.
- the start control of the internal combustion engine by the second start control that is not performed can be started. Therefore, the output torque of the internal combustion engine (ENG) is set to the wheel (compared to the case where the first start control is performed after the rotation speed change of the rotating electrical machine (MG) for downshifting is completed to start the internal combustion engine (ENG)). It becomes possible to realize the state that can be transmitted to W) at an early stage.
- the first start control is performed and the internal combustion engine (ENG) is started after the rotation speed change of the rotating electrical machine (MG) for downshifting is completed.
- a vehicle such as a driver (rather than realizing a state where the output torque of the internal combustion engine (ENG) can be transmitted to the wheels (W) at an early stage)
- the internal combustion engine (ENG) can be started by giving priority to not generating an operation sound of the starter motor (ST) that may give the occupant an uncomfortable feeling.
- durability of the starter motor (ST) is easily ensured by not performing the second start control more than necessary.
- the first start is performed.
- the internal combustion engine (ENG) can be quickly started by starting the control and using the output torque of the rotating electrical machine (MG).
- the second start control is started and the starter is started.
- the internal combustion engine (ENG) is started by the output torque of the motor (ST).
- the rotating electrical machine (MG) does not need to bear the starting torque (Ts) and the inertia torque (Ti), and therefore the maximum output torque of the rotating electrical machine (MG). (Tmax) can be used as the running torque. Therefore, it becomes possible to respond to a higher required wheel torque.
- the technology according to the present disclosure controls a vehicle drive device in which an engagement device, a rotating electrical machine, and a transmission device are provided in order from the internal combustion engine side in a power transmission path that connects the internal combustion engine and wheels. It can be used for a control device.
- Vehicle 2 Vehicle drive device 32: Control device ENG: Internal combustion engine MG: Rotating electric machine SSC: Engagement device ST: Starter motor TM: Transmission device Tmax: Maximum torque W: Wheel
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Abstract
Description
本実施形態に係る制御装置32の制御対象となる車両用駆動装置2の構成について説明する。図1に示すように、車両1(ハイブリッド車両)には、内燃機関ENG、車両用駆動装置2、及び車輪Wが備えられている。なお、図1では、駆動力の伝達経路を実線で示し、信号や油圧の伝達経路を一点鎖線で示し、電力の伝達経路を二重の破線で示している。車両用駆動装置2は、内燃機関ENGと車輪Wとを結ぶ動力伝達経路に、内燃機関ENGの側から順に、係合装置SSC、回転電機MG、及び変速装置TMを備えている。係合装置SSCは摩擦係合装置である。ここで、内燃機関は、機関内部における燃料の燃焼により駆動されて動力を取り出す原動機(例えば、ガソリンエンジン、ディーゼルエンジン等)である。また、回転電機は、モータ(電動機)、ジェネレータ(発電機)、及び必要に応じてモータ及びジェネレータとしての双方の機能を果たすモータ・ジェネレータのいずれをも含む概念として用いている。車両用駆動装置2は、内燃機関ENG及び回転電機MGの少なくとも一方のトルクを車輪Wに伝達させて車両1を走行させる。本明細書では、車両1を前進させる方向のトルク(前進加速方向のトルク)を正トルクとし、それとは反対方向のトルクを負トルクとする。車両用駆動装置2は、内燃機関ENGの出力トルクが正トルクとして車輪Wに伝達されるように構成されている。変速装置TMによって、変速比の異なる複数の変速段が選択的に形成される。変速装置TMは、複数の変速用係合装置(図2参照)を備える。
図1に示すように、本実施形態では、車両1の状態(走行状態等)を制御するための制御装置として、制御装置32の他に、内燃機関制御装置31が設けられている。制御装置32や内燃機関制御装置31は、CPU等の演算処理装置を中核として備えると共に、RAMやROM等の記憶装置を備える。ROM等の記憶装置に記憶されたソフトウェア(プログラム)又は別途設けられた演算回路等のハードウェア、或いはそれらの両方により、制御装置32や内燃機関制御装置31が実行する各機能が実現される。制御装置32や内燃機関制御装置31が備える演算処理装置は、各プログラムを実行するコンピュータとして動作する。制御装置32及び内燃機関制御装置31は、互いに通信可能に構成されており、センサの検出情報及び制御パラメータ等の各種情報を共有すると共に、各種制御信号をやりとりすることで協調制御を行うように構成されている。制御装置32及び内燃機関制御装置31の一方又は双方が、互いに通信可能な複数のハードウェア(複数の分離したハードウェア)の集合によって構成されても良い。また、制御装置32と内燃機関制御装置31とが、共通のハードウェアに備えられる構成とすることもできる。
アクセル開度、アクセル開度の変化率、及び車速については、これらが大きくなるに従って高くなるようにトルク応答性要求が決定される。また、車両モードについては、運転者によって選択されている車両モード(例えば、ノーマルモード、スポーツモード等)に対応するトルク応答性の程度に応じて、トルク応答性要求が決定される。そして、トルク応答性要求を、要求の度合いが高くなるに従って大きくなる数値(指標)で表した場合に、当該数値が閾値以上である状態を高応答要求状態とし、当該数値が閾値未満である状態を低応答要求状態とすることができる。
制御装置のその他の実施形態について説明する。なお、以下のそれぞれの実施形態で開示される構成は、矛盾が生じない限り、他の実施形態で開示される構成と組み合わせて適用することも可能である。
以上で説明した実施形態は、以下の構成を備えている。
内燃機関(ENG)と車輪(W)とを結ぶ動力伝達経路に、前記内燃機関(ENG)の側から順に、係合装置(SSC)、回転電機(MG)、及び、変速装置(TM)が設けられた車両用駆動装置(2)を制御対象とする制御装置(32)であって、前記係合装置(SSC)を介して前記回転電機(MG)の出力トルクによって前記内燃機関(ENG)を始動させる始動制御を第一始動制御とし、前記係合装置(SSC)の解放状態で前記回転電機(MG)の出力トルクによって車両(1)を走行させている走行状態を電動走行状態として、前記変速装置(TM)による変速比を、変速後の変速比が変速前の変速比に対して大きくなるように変更するダウンシフトを前記電動走行状態で行っている間に前記内燃機関(ENG)の始動要求があった場合には、前記ダウンシフトの終了後に前記第一始動制御を行う。
2:車両用駆動装置
32:制御装置
ENG:内燃機関
MG:回転電機
SSC:係合装置
ST:スタータモータ
TM:変速装置
Tmax:最大トルク
W:車輪
Claims (6)
- 内燃機関と車輪とを結ぶ動力伝達経路に、前記内燃機関の側から順に、係合装置、回転電機、及び、変速装置が設けられた車両用駆動装置を制御対象とする制御装置であって、
前記係合装置を介して前記回転電機の出力トルクによって前記内燃機関を始動させる始動制御を第一始動制御とし、
前記係合装置の解放状態で前記回転電機の出力トルクによって車両を走行させている走行状態を電動走行状態として、
前記変速装置による変速比を、変速後の変速比が変速前の変速比に対して大きくなるように変更するダウンシフトを前記電動走行状態で行っている間に前記内燃機関の始動要求があった場合には、前記ダウンシフトの終了後に前記第一始動制御を行う制御装置。 - 前記ダウンシフトの終了後は、前記ダウンシフトのための前記回転電機の出力トルクによる前記回転電機の回転速度変化の終了後である請求項1に記載の制御装置。
- 前記変速装置から前記動力伝達経路の前記車輪側に出力される出力トルクに対する、前記変速装置に対して前記動力伝達経路の前記回転電機側から入力される入力トルクの比率をトルク比として、
前記ダウンシフトの終了後に前記第一始動制御を行う場合に、前記ダウンシフトによる前記トルク比の変化が生じている期間内に前記係合装置の伝達トルクが上昇し始めるように、前記係合装置を制御する請求項1又は2に記載の制御装置。 - 前記電動走行状態であって前記ダウンシフトを行っていない間に前記内燃機関の始動要求があった場合には、前記第一始動制御を開始する請求項1から3のいずれか一項に記載の制御装置。
- スタータモータの出力トルクによって前記内燃機関を始動させる始動制御を第二始動制御とし、
前記ダウンシフトを前記電動走行状態で行っている間に前記内燃機関の始動要求があった場合に、前記車輪に伝達するトルクに対する応答性の要求であるトルク応答性要求が、高応答要求状態である場合には、前記第二始動制御を行い、前記トルク応答性要求が、前記高応答要求状態よりも前記応答性に対する要求が低い低応答要求状態である場合には、前記第一始動制御を行う請求項1から4のいずれか一項に記載の制御装置。 - 前記電動走行状態であって前記ダウンシフトを行っていない間に前記内燃機関の始動要求があった場合であって、前記トルク応答性要求が前記低応答要求状態である場合には前記第一始動制御を開始し、前記トルク応答性要求が前記高応答要求状態である場合には前記第二始動制御を開始する請求項5に記載の制御装置。
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