JP2009126449A - Vehicle, starting controller of internal combustion engine, and starting method for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more improve a drivability while meeting drivers's demands more when starting an internal combustion engine. <P>SOLUTION: When a starting request for an engine is based upon driver's intention and a battery output limit indicating allowable electric power which can be charged in and discharged from a battery 50 is not within a predetermined output allowable range, a first starting mode wherein the engine 22 is quickly started is set, but when the starting request is not based on the driver's intention or when the start request is based on the driver's intention and the battery output limit is within the output allowable range, meanwhile, a second starting mode which is slower than the first starting mode is set and the engine 22 is started in the set start mode. Thus, the engine 22 is started slowly at a start request not based upon the driver's intention so that the driver does not have a feeling of physical disorder, and in spite of the starting request based upon the driver's intention on condition that power can be output from a motor MG2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle, a start control device for an internal combustion engine, and a start method for an internal combustion engine, and more particularly, a vehicle including an internal combustion engine capable of outputting power to a drive shaft and motoring means capable of motoring the internal combustion engine. The present invention relates to an internal combustion engine start control device and an internal combustion engine start method.

Conventionally, as a vehicle, when the required power Pr * of the drive shaft becomes equal to or higher than the threshold value Pref when the engine is stopped, the engine is motored by the motor MG1 in the first start mode as a start based on the driver's intention, and the SOC of the battery is An engine that is not intended by the driver by motoring the engine in a second start mode set smaller than the first start mode as a start not based on the driver's intention when the air conditioner is turned on below the threshold Sref There has been proposed one that reduces the occurrence of torque shock due to motoring during startup and improves drivability (see, for example, Patent Document 1).
JP 2004-143957 A

  However, in the vehicle described in Patent Document 1, when the start is based on the driver's will, the engine is started in the first start mode with a large torque in order to start the engine quickly so as to satisfy the driver's request. For this reason, torque shock due to motoring and starting the engine may still occur, and it has been desired to further improve the drivability by performing further appropriate starting control.

  The present invention has been made in view of such problems, and a vehicle capable of further improving drivability while satisfying the requirements of the driver when starting the internal combustion engine, and a start control device for the internal combustion engine And it aims at providing the starting method of an internal combustion engine.

  The present invention adopts the following means in order to achieve the above-mentioned object.

The vehicle of the present invention
An internal combustion engine capable of outputting power to the drive shaft;
Motoring means capable of motoring the internal combustion engine;
An electric motor capable of outputting driving power;
Power storage means capable of exchanging electric power with the motoring means and the electric motor,
An input / output limit setting means for setting an input / output limit that is an allowable power that may charge and discharge the power storage means based on a state of the power storage means;
When the start request of the internal combustion engine is a request based on the driver's intention and the input / output restriction is outside a predetermined output allowable range, the first start mode is set, while the start request is based on the driver's intention. If the start request is a request based on the driver's intention and the input / output limit is within a predetermined output allowable range, a second start mode that is gentler than the first start mode is set. Starting form setting means to perform,
Start control means for driving and controlling the motoring means so that the internal combustion engine is motored with the set start form;
It is equipped with.

  In this vehicle, an input / output limit, which is allowable power that may charge / discharge the power storage means, is set based on the state of the power storage means, and the start request of the internal combustion engine is a request based on the driver's intention, and the input / output limit is set. The first start mode is set when the engine is outside the predetermined output allowable range, while the start request is a request not based on the driver's intention or the start request is a request based on the driver's intention and the input / output restriction Is within a predetermined allowable output range, a second start mode that is gentler than the first start mode is set, and the internal combustion engine is motored with the set start mode to start the internal combustion engine. In this way, with a start request that is not based on the driver's will, a torque shock due to the start of the internal combustion engine gives the driver a sense of discomfort, so the internal combustion engine is started more gently and the start based on the driver's will Even if required, the internal combustion engine is started more gently when power can be output from the electric motor. On the other hand, when the start request is based on the will of the driver and the input / output limit of the power storage means is outside the allowable output range, that is, when power cannot be output from the motor, the internal combustion engine is started quickly. Therefore, drivability when starting the internal combustion engine can be further improved while satisfying the driver's request. Here, the “predetermined allowable output range” may be empirically set as a range in which sufficient power can be output from the electric motor, for example.

  In the vehicle of the present invention, the start mode setting means may be a means for setting an output torque of the motoring means smaller than the first start mode as the second start mode. By so doing, drivability can be improved more easily by changing the magnitude of the output torque.

  In the vehicle of the present invention, the start mode setting means may be a means for setting the output torque of the motoring means that rises more slowly than the first start mode as the second start mode. In this way, drivability can be improved relatively easily by slowing the rise of the output torque.

  In the vehicle of the present invention, the start mode setting means may be means for setting the output torque of the motoring means that is smaller as the input / output limit of the power storage means is larger as the first start mode. In this way, when the input / output restriction is large, that is, when the driving power can be output from the electric motor by the electric power from the power storage means, the drivability is further improved by setting the output torque of the motoring means to be small. Can be improved.

  In the vehicle of the present invention, the start mode setting means may be a means for setting a larger output torque of the motoring means as the travel request by the driver is larger as the first start mode. In this way, when the travel request is large, that is, when it is necessary to output the power quickly, the output torque is set to be large, so that the internal combustion engine can be started more quickly, so that the driver's request is further satisfied. Can do. The starting mode setting means tends to increase as the driving request from the driver increases so that the input / output limit of the power storage unit decreases as the first starting mode increases. The torque may be set.

  In the vehicle of the present invention, the start mode setting means may be a means that a request based on the driver's intention is made when the start request is made based on a travel request by the driver. . Further, the starting mode setting means is configured to use a drive request for a predetermined auxiliary machine that is driven using power from the internal combustion engine directly or indirectly and power obtained by converting power from the power from the internal combustion engine. When the start request is made based on at least one of the charge requests for the rechargeable secondary battery, it may be a means that a request not based on the driver's intention is made.

  In the vehicle according to the present invention, the motoring means is connected to a drive shaft connected to an axle and is connected to an output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, and to input and output electric power and power. Therefore, it may be a means capable of inputting / outputting power to / from the drive shaft and the output shaft. In the vehicle of the present invention, the motoring means is connected to three axes of a generator that inputs and outputs power, the drive shaft, the output shaft, and a rotating shaft of the generator. Three-axis power input / output means for inputting / outputting power to / from the remaining shafts based on power input / output to / from any two axes may be provided.

An internal combustion engine starter according to the present invention includes:
In a vehicle provided with an internal combustion engine, motoring means capable of motoring the internal combustion engine, an electric motor capable of outputting driving power, and power storage means capable of exchanging electric power with the motoring means and the electric motor. An internal combustion engine start control device for controlling the start of the internal combustion engine,
The input / output limit is a predetermined output allowable range in which the start request of the internal combustion engine is a request based on a driver's intention and is an allowable power that may be charged / discharged for the power storage means set based on the state of the power storage means The first start mode is set when the engine is outside, and when the start request is a request not based on the driver's intention or when the start request is a request based on the driver's intention and the input / output restriction is a predetermined output Start mode setting means for setting a second start mode that is gentler than the first start mode when within an allowable range;
Start control means for driving and controlling the motoring means so that the internal combustion engine is motored with the set start form;
It is equipped with.

  In this internal combustion engine starter, the start request for the internal combustion engine is a request based on the driver's intention, and the input / output limit is an allowable power that may charge / discharge the power storage means set based on the state of the power storage means Is set outside the predetermined allowable output range, the first start mode is set. On the other hand, when the start request is a request not based on the driver's intention or the start request is a request based on the driver's intention and input / output When the limit is within the predetermined allowable output range, a second start mode that is gentler than the first start mode is set, and the internal combustion engine is motored with the set start mode to start the internal combustion engine. In this way, with a start request that is not based on the driver's will, a torque shock due to the start of the internal combustion engine gives the driver a sense of discomfort, so the internal combustion engine is started more gently and the start based on the driver's will Even if required, the internal combustion engine is started more gently when power can be output from the electric motor. On the other hand, when the start request is based on the will of the driver and the input / output limit of the power storage means is outside the allowable output range, that is, when power cannot be output from the motor, the internal combustion engine is started quickly. Therefore, drivability when starting the internal combustion engine can be further improved while satisfying the driver's request. It should be noted that various aspects of the vehicle described above may be employed in the internal combustion engine starter.

The internal combustion engine starting method of the present invention includes:
In a vehicle comprising an internal combustion engine, motoring means capable of motoring the internal combustion engine, an electric motor capable of outputting driving power, and power storage means capable of exchanging electric power with the motoring means and the electric motor. A method for starting the internal combustion engine, comprising:
An input / output limit that is an allowable maximum power that may charge / discharge the power storage unit is set based on a state of the power storage unit, and the start request of the internal combustion engine is a request based on a driver's intention, and the input / output limit 1 is set when the engine is outside the predetermined output allowable range, while the start request is a request not based on the driver's intention or the start request is a request based on the driver's intention. When the input output limit is within a predetermined output allowable range, a second start mode that is gentler than the first start mode is set, and the motor is motored so that the internal combustion engine is motored with the set start mode. Driving the ring means to start the internal combustion engine.

  In this internal combustion engine starting method, an input / output limit, which is allowable power that may charge / discharge the power storage means, is set based on the state of the power storage means, and the start request for the internal combustion engine is a request based on the intention of the driver. Yes The first start mode is set when the input / output limit is outside the predetermined output allowable range, while the start request is a request not based on the driver's intention or the start request is a request based on the driver's intention. When the input / output limit is within a predetermined output allowable range, a second start mode that is gentler than the first start mode is set, and the internal combustion engine is motored with the set start mode to Start. In this way, with a start request that is not based on the driver's will, a torque shock due to the start of the internal combustion engine gives the driver a sense of discomfort, so the internal combustion engine is started more gently and the start based on the driver's will Even if required, the internal combustion engine is started more gently when power can be output from the electric motor. On the other hand, when the start request is based on the will of the driver and the input / output limit of the power storage means is outside the allowable output range, that is, when power cannot be output from the motor, the internal combustion engine is started quickly. Therefore, drivability when starting the internal combustion engine can be further improved while satisfying the driver's request. It should be noted that various aspects of the vehicle described above may be employed in the internal combustion engine starter. Moreover, you may add the step which implement | achieves each function of the vehicle mentioned above.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 equipped with a power output apparatus according to an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a three-shaft power distribution / integration mechanism 30 connected to a crankshaft 26 as an output shaft of the engine 22 via a damper 28, and power distribution / integration. A motor MG1 capable of generating electricity connected to the mechanism 30, a reduction gear 35 attached to a ring gear shaft 32a as a drive shaft connected to the power distribution and integration mechanism 30, a motor MG2 connected to the reduction gear 35, And a hybrid electronic control unit 70 for controlling the entire power output apparatus.

  The engine 22 is an internal combustion engine that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, and an engine electronic control unit (hereinafter referred to as an engine ECU) that receives signals from various sensors that detect the operating state of the engine 22. ) 24 is subjected to operation control such as fuel injection control, ignition control, intake air amount adjustment control and the like. The engine ECU 24 is in communication with the hybrid electronic control unit 70, controls the operation of the engine 22 by a control signal from the hybrid electronic control unit 70, and, if necessary, transmits data related to the operating state of the engine 22 to the hybrid electronic control. Output to unit 70.

  The power distribution and integration mechanism 30 includes an external gear sun gear 31, an internal gear ring gear 32 arranged concentrically with the sun gear 31, a plurality of pinion gears 33 that mesh with the sun gear 31 and mesh with the ring gear 32, A planetary gear mechanism is provided that includes a carrier 34 that holds a plurality of pinion gears 33 so as to rotate and revolve, and that performs differential action using the sun gear 31, the ring gear 32, and the carrier 34 as rotational elements. In the power distribution and integration mechanism 30, the crankshaft 26 of the engine 22 is connected to the carrier 34, the motor MG1 is connected to the sun gear 31, and the reduction gear 35 is connected to the ring gear 32 via the ring gear shaft 32a. When functioning as a generator, power from the engine 22 input from the carrier 34 is distributed according to the gear ratio between the sun gear 31 side and the ring gear 32 side, and when the motor MG1 functions as an electric motor, the engine input from the carrier 34 The power from 22 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side. It is also possible to start the engine 22 by motoring the engine 22 by outputting the power from the motor MG1 input from the sun gear 31 to the carrier 34 side. Therefore, the motor MG1 can also function as a starter motor that is responsible for starting the engine 22. The power output to the ring gear 32 is finally output from the ring gear shaft 32a to the drive wheels 63a and 63b of the vehicle via the gear mechanism 60 and the differential gear 62.

The motor MG1 and the motor MG2 are both configured as well-known synchronous generator motors that can be driven as generators and can be driven as motors, and exchange power with the battery 50 via inverters 41 and 42. The power line 54 connecting the inverters 41 and 42 and the battery 50 is configured as a positive electrode bus and a negative electrode bus shared by the inverters 41 and 42, and the electric power generated by one of the motors MG1 and MG2 It can be consumed by a motor. Therefore, battery 50 is charged / discharged by electric power generated from one of motors MG1 and MG2 or insufficient electric power. If the balance of electric power is balanced by the motors MG1 and MG2, the battery 50 is not charged / discharged. The motors MG1 and MG2 are both driven and controlled by a motor electronic control unit (hereinafter referred to as a motor ECU) 40. The motor ECU 40 detects signals necessary for driving and controlling the motors MG1 and MG2, such as signals from rotational position detection sensors 43 and 44 that detect the rotational positions of the rotors of the motors MG1 and MG2, and current sensors (not shown). The phase current applied to the motors MG1 and MG2 to be applied is input, and a switching control signal to the inverters 41 and 42 is output from the motor ECU 40. The motor ECU 40 is in communication with the hybrid electronic control unit 70, controls the driving of the motors MG1 and MG2 by a control signal from the hybrid electronic control unit 70, and, if necessary, data on the operating state of the motors MG1 and MG2. Output to the hybrid electronic control unit 70.

  The battery 50 is managed by a battery electronic control unit (hereinafter referred to as a battery ECU) 52. The battery ECU 52 receives signals necessary for managing the battery 50, for example, a voltage between terminals from a voltage sensor (not shown) installed between terminals of the battery 50, and a power line 54 connected to the output terminal of the battery 50. The charging / discharging current from the attached current sensor (not shown), the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input. Output to the control unit 70. The battery ECU 52 also calculates the remaining capacity (SOC) based on the integrated value of the charge / discharge current detected by the current sensor in order to manage the battery 50.

  The hybrid electronic control unit 70 is configured as a microprocessor centered on the CPU 72, and in addition to the CPU 72, a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, an input / output port and communication not shown. And a port. The hybrid electronic control unit 70 includes an ignition signal from an ignition switch 80, a shift position SP from a shift position sensor 82 that detects the operation position of the shift lever 81, and an accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83. On / off switch of the air conditioner 92 that air-conditions the passenger compartment 90, the brake pedal position BP from the brake pedal position sensor 86 that detects the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, A switch signal from the air conditioner switch 89) is input via the input port. As described above, the hybrid electronic control unit 70 is connected to the engine ECU 24, the motor ECU 40, the battery ECU 52, and the air conditioner 92 through the communication port, and the engine ECU 24, the motor ECU 40, the battery ECU 52, the air conditioner 92, and the various types. Control signals and data are exchanged.

  The hybrid vehicle 20 of the embodiment thus configured calculates the required torque to be output to the ring gear shaft 32a as the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. Then, the operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the required torque is output to the ring gear shaft 32a. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power for the ring gear shaft 32a is output from the engine 22, and all of the power output from the engine 22 is controlled. When the motor MG1 and the motor MG2 are driven and controlled so that torque is converted by the power distribution and integration mechanism 30, the motor MG1 and the motor MG2 and output to the ring gear shaft 32a, or when the remaining capacity SOC of the battery 50 is low (for example, 30% and 40%), the engine 22 is controlled to operate so that power corresponding to the sum of the required power and the power required for charging the battery 50 is output from the engine 22, and the engine 22 is charged with the battery 50 being charged. The power output from the power distribution and integration mechanism 30, the motor MG1, and the motor The required power when the remaining capacity SOC of the battery 50 is high (for example, 70% or 80%) in the charge operation mode in which the motor MG1 and the motor MG2 are driven and controlled to be output to the ring gear shaft 32a with torque conversion by MG2. In addition, the engine 22 is operated and controlled so that the power corresponding to the difference from the discharge power of the battery 50 is output from the engine 22, and the power output from the engine 22 with the discharge of the battery 50 is the power distribution integration mechanism 30 and the motor. Discharge operation mode in which motor MG1 and motor MG2 are driven and controlled so that required power is output to ring gear shaft 32a with torque conversion by MG1 and motor MG2, and vehicle speed is relatively low (for example, vehicle speed V is less than threshold value Vref). Or when the required power is low (for example, the required power is less than the threshold value Pref) Power matching the required power to stop the operation of the engine 22 is a motor operation mode in which operation control to be output from the motor MG2 to the ring gear shaft 32a.

  In the hybrid vehicle 20 of the embodiment, when a predetermined stop condition is satisfied, for example, the motor operation mode is set from the state in which the normal operation mode, the charge operation mode, and the discharge operation mode are set as the above-described operation mode. When the engine 22 is automatically stopped and a predetermined start condition is satisfied, for example, when the normal operation mode, the charge operation mode, or the discharge operation mode is set from the state where the motor operation mode is set as the operation mode described above. The engine 22 is automatically started. Hereinafter, the operation at the time of automatic starting of the engine 22 will be described.

  FIG. 2 is a flowchart showing an example of an engine start processing routine executed by the hybrid electronic control unit 70. This routine is repeatedly executed every predetermined time (for example, every several msec). When the engine start processing routine is executed, the CPU 72 of the hybrid electronic control unit 70 firstly calculates the accelerator opening Acc from the accelerator pedal position sensor 84, the vehicle speed V from the vehicle speed sensor 88, the battery 50 calculated by the battery ECU 52. A process for inputting data necessary for control, such as the remaining capacity SOC, the output limit Wout of the battery 50, and a switching signal from the air conditioner switch 89 is executed (step S100). Here, the output limit Wout of the battery 50 is set based on the battery temperature Tb of the battery 50 detected by the temperature sensor 51 and the remaining capacity (SOC) of the battery 50, and is input from the battery ECU 52 by communication. It was. The input / output limits Win and Wout of the battery 50 are set to the basic values of the input / output limits Win and Wout based on the battery temperature Tb, and the output limiting correction coefficient and the input are set based on the remaining capacity (SOC) of the battery 50. It can be set by setting a correction coefficient for restriction and multiplying the basic value of the set input / output restrictions Win and Wout by the correction coefficient. FIG. 3 shows an example of the relationship between the battery temperature Tb and the input / output limits Win, Wout, and FIG. 4 shows an example of the relationship between the remaining capacity (SOC) of the battery 50 and the correction coefficients of the input / output limits Win, Wout.

  Next, processing is performed for setting the required torque Tr * of the ring gear shaft 32a as the drive shaft and the required power Pr * based on the input accelerator opening Acc and the vehicle speed V (step S110). In the embodiment, the required torque Tr * is obtained in advance by storing the relationship between the accelerator opening Acc, the vehicle speed V, and the required torque Tr * in the ROM 74 as a required torque setting map. If given, the corresponding required torque Tr * is derived from the required torque setting map. The required power Pr * is calculated by multiplying the derived required torque Tr * by the rotation speed Nr (= r · V) of the ring gear shaft 32a that is calculated in proportion to the vehicle speed V. The required power Pr * may be calculated based on the rotational speed Nr of the ring gear shaft 32a calculated by the rotational position detection sensor 44.

  When the required power Pr * is thus set, it is determined whether or not the set required power Pr * is equal to or greater than the threshold value Pref (step S120). When it is determined that the required power Pr * is equal to or greater than the threshold value Pref, it is assumed that the engine 22 start condition is satisfied based on the driver's intention, and whether or not the output limit Wout of the battery 50 exceeds the output allowable threshold value Wref. Is determined (step S130). Here, the output allowable threshold value Wref is set empirically as a lower limit value of a range in which sufficient power can be output from the motor MG2 over a predetermined time. When the output limit Wout of the battery 50 does not exceed the output allowable threshold value Wref, that is, when the battery output limit Wout is outside the output allowable range, the battery 50 is not sufficiently charged, and the engine 22 should be started quickly. The first start mode is set to the start mode for execution (step S140). Here, the start form means an output form of motoring torque from the motor MG1 when the motor 22 is driven (rotated) to drive the motor MG1 in order to start the engine 22, and the first start form Then, the value of the output torque is set as large as possible so that the engine 22 can be started quickly.

  Then, it is determined whether or not the start of the engine 22 is requested (step S150). Since the start of the engine 22 is requested here, the motor MG1 is driven based on the set first start mode. The motor ECU 40 is commanded to motor the engine 22 (step S160), the engine ECU 24 is commanded to start the engine 22 (step S170), and this routine is terminated. In this way, when the start condition of the engine 22 is established based on the driver's intention and the battery 50 does not have a sufficient amount of electricity stored, the engine 22 is started as quickly as possible so that more power can be output. This satisfies the driver's request. Even if vibration is generated in the engine 22 during the motoring, the driver is considered to start the engine 22, so that the driver does not feel so uncomfortable.

  On the other hand, when the output limit Wout of the battery 50 exceeds the output allowable threshold Wref in step S130, that is, when the battery output limit Wout is within the output allowable range, the battery 50 has a sufficient amount of charge, and the engine 22 Since it is less necessary to start quickly, the second start mode that is gentler than the first start mode is set as the start mode for execution (step S200). FIG. 5 is an explanatory diagram of an example of the motoring torque output from the motor MG1 in each of the first start mode and the second start mode. Here, the second start form has the same rise as the first start form, but is set to a smaller output torque than the first start form. Thus, in the second start mode, the start time of the engine 22 is lengthened, but the output torque value is set such that torque shock is less likely to occur. Subsequently, in step S150, it is determined whether or not the start of the engine 22 is requested. Here, since the start of the engine 22 is requested, the motor MG1 is driven based on the set start mode and the engine 22 is driven. Is commanded to the motor ECU 40 in step S160, the engine ECU 24 is commanded to start the engine 22 in step S170, and this routine is terminated. As described above, even when the starting condition of the engine 22 is satisfied based on the driver's intention, when the battery 50 has a sufficient amount of charge, the driving power can be output from the motor MG2 by the electric power of the battery 50. Therefore, the torque shock is suppressed by gently starting the engine 22.

  On the other hand, when it is determined in step S120 that the required power Pr * is not equal to or greater than the threshold value Pref, it is determined whether the remaining capacity SOC is less than the threshold value Sref (step S180) and whether the air conditioner switch 89 is turned on (step S180). In step S190), when it is determined that the remaining capacity SOC is less than the threshold value Sref or the air conditioner switch 89 is turned on, it is assumed that the start condition is satisfied without being based on the driver's intention, and the second start form is changed to the start form for execution. Set (step S200). Subsequently, in step S150, it is determined whether or not the start of the engine 22 is requested. Here, since the start of the engine 22 is requested, the motor MG1 is driven based on the set start mode and the engine 22 is driven. Is commanded to the motor ECU 40 in step S160, the engine ECU 24 is commanded to start the engine 22 in step S170, and this routine is terminated. When it is determined in steps S180 and S190 that the remaining capacity SOC is equal to or greater than the threshold value Sref or that the air conditioner switch 89 is not turned on, it is determined in step S150 that the engine 22 is not required to be started, and the processing after step S100 is performed. repeat. Thus, when the start condition of the engine 22 that is not based on the driver's intention is satisfied, such as when the air conditioner switch 89 of the air conditioner 92 is turned on, the driving power is not output quickly, and the torque shock In order to prevent the driver from feeling uncomfortable, the engine 22 is gently started to suppress the torque shock.

  According to the hybrid vehicle 20 of the embodiment described above, the battery output limit Wout, which is allowable power that may charge and discharge the battery 50, is set based on the state of the battery 50, and the start request of the engine 22 is determined by the driver. The first start mode is set when the request is based on the intention and the battery output limit Wout is outside the predetermined output allowable range, while when the start request is a request not based on the intention of the driver or when the start request is determined by the driver When the request is based on the intention and the battery output limit Wout is within a predetermined output allowable range, a second start mode that is gentler than the first start mode is set, and the engine 22 is motored with the set start mode. The engine 22 is started. As described above, when the start request is not based on the driver's will, it is less necessary to output the power quickly, and when the torque shock due to the start of the engine 22 occurs, the driver feels uncomfortable. Even if the start request is based on the will of the driver, the engine 22 is started more gently when power can be output from the motor MG2. On the other hand, when the start request is based on the driver's will and the battery output limit Wout is out of the allowable output range, that is, when the power cannot be output from the motor MG2, the engine 22 is started quickly to increase the power. It can be output. Therefore, drivability when starting the engine 22 can be further improved while satisfying the driver's request. Further, since the output torque of the motor MG1 smaller than that in the first start mode is set as the second start mode, drivability can be improved relatively easily by changing the magnitude of the output torque.

  In the hybrid vehicle 20 of the embodiment, the engine 22 is started when the driver intends the motoring torque in the second starting form as the starting form when the engine 22 is started when the driver does not intend. The motoring torque is set to be smaller than the motoring torque in the first starting form as the starting form, but if the torque shock (vibration) accompanying the starting of the engine 22 when the driver does not intend can be reduced Therefore, as shown in FIG. 6A, the rising of the motoring torque in the second starting form may be set so as to be gentler than the rising of the motoring torque in the first starting form. Or, as shown in FIG. 6 (b), the magnitude of the motoring torque in the second start mode is set to the first start mode. It may be as set to be slower than the rise of the motoring torque at the rising of the second start mode motoring torque in the second start mode with smaller than the size of the motoring torque that.

  In the hybrid vehicle 20 of the embodiment, as shown in FIG. 5, the predetermined output torque is set in the first start mode, but the output torque in the first start mode is set to the required power P * or It may be set as appropriate based on the value of the battery output limit Wout. FIG. 7 is an explanatory diagram showing an example of a motoring torque TC setting map for setting the motoring torque Tc based on the value of the required power P * and the battery output limit Wout. As shown in FIG. 7, the motoring torque Tc is set so as to decrease as the battery output limit Wout of the battery 50 increases as the first starting mode increases and as the required power P * by the driver increases. It is. In this way, when the battery output limit Wout is large, that is, when driving power can be output from the motor MG2 by the electric power from the battery 50, the drivability is further improved by setting the output torque of the motoring means small. This can be further improved. Further, when the required power P * is large, that is, when it is necessary to output the power quickly, the motoring torque Tc is set to be large, so that the engine 22 can be started more quickly, so that the driver's request is further increased. Can be satisfied. The motoring torque Tc may be set based on at least one of the battery output limit Wout and the required power P *.

  In the hybrid vehicle 20 of the embodiment, the start request not based on the driver's intention based on whether or not the remaining capacity SOC of the battery 50 is less than the threshold value Sref and whether or not the switch of the air conditioner 92 is ON. However, the present invention is not limited to this.

  In the hybrid vehicle 20 of the embodiment, an engine 22, a three-shaft power distribution and integration mechanism 30 connected to the output shaft (crankshaft 26) of the engine 22, and a motor capable of generating electricity connected to the power distribution and integration mechanism 30. Although it is configured as a hybrid vehicle including MG1 and a motor MG2 connected to the drive shaft (ring gear shaft 32a) connected to the power distribution and integration mechanism 30 and the drive wheels 63a and 63b, power can be output to the drive shaft. Applicable to other hybrid vehicles as long as it is equipped with an internal combustion engine and an electric motor that can input a starting torque to the internal combustion engine in various output forms and can automatically stop and start the internal combustion engine. can do. For example, as illustrated in the hybrid vehicle 120 of the modification of FIG. 8, the power of the motor MG2 is different from the axle (the axle to which the driving wheels 63a and 63b are connected) to which the ring gear shaft 32a is connected (in FIG. 8). It is good also as what connects to the axles connected to the wheels 64a and 64b. Alternatively, as illustrated in the hybrid vehicle 220 of the modified example of FIG. 9, the inner rotor 232 connected to the crankshaft 26 of the engine 22 and the outer rotor 234 connected to the drive shaft that outputs power to the drive wheels 63a and 63b. And a counter-rotor motor 230 that transmits a part of the power of the engine 22 to the drive shaft and converts the remaining power into electric power. Also, an engine, a three-shaft power distribution and integration mechanism (planetary gear mechanism) in which the first shaft is connected to the output shaft of the engine, and a motor capable of generating electricity connected to the second shaft of the power distribution and integration mechanism And a hybrid vehicle including a transmission (such as a continuously variable transmission) connected to the third shaft of the power distribution and integration mechanism and an axle connected to the wheels. Further, the vehicle is not necessarily a hybrid vehicle as long as the vehicle can automatically stop the internal combustion engine that outputs power to the drive shaft and can be automatically started using an electric motor.

  Although the embodiment has been described as a hybrid vehicle, the present invention is not limited to a vehicle, but may be a start control device for an internal combustion engine in a vehicle or a start method for an internal combustion engine.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 22 corresponds to an “internal combustion engine”, the power distribution and integration mechanism 30 and the motor MG1 correspond to “motoring means”, the motor MG2 corresponds to “electric motor”, and the battery 50 corresponds to “power storage means”. The battery ECU 52 that sets the battery input / output limits Win and Wout, which are allowable powers that may charge / discharge the battery 50, based on the state of the battery 50 corresponds to the “input / output limit setting means”. When the start request 22 is a request based on the driver's intention and the battery output limit Wout is outside the predetermined output allowable range, the first start mode is set, while the start request is a request not based on the driver's intention. Or when the start request is a request based on the driver's intention and the battery output limit Wout is within a predetermined output allowable range, as compared with the first start mode. The hybrid electronic control unit 70 that sets the second start mode, which is a small output torque, corresponds to the “start mode setting means”, and drives and controls the motor MG1 so that the engine 22 is motored with the set start mode. The hybrid electronic control unit 70 that starts the engine 22, the motor ECU 40, and the engine ECU 24 correspond to “starting control means”. Further, the motor MG1 corresponds to a “generator”, and the power distribution and integration mechanism 30 corresponds to a “3-axis power input / output unit”. Further, the anti-rotor motor 230 also corresponds to “motoring means”. Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, but can output power when supplied with fuel, such as a hydrogen engine. Any object can be used. The “motoring means” is not limited to the combination of the power distribution and integration mechanism 30 and the motor MG1 or the anti-rotor motor 230. The engine can be motored and power is generated using the power from the engine. Any generator that can motor the internal combustion engine, such as a possible generator, may be used. The “motor” is not limited to the motor MG2 configured as a synchronous generator motor, and may be any type of motor as long as it can output power for traveling, such as an induction motor. The “storage means” is not limited to the battery 50 as a secondary battery, and may be anything as long as it can exchange power with a motoring means or an electric motor such as a capacitor. The “input / output restriction setting means” and “starting control means” are not limited to the combination of the hybrid electronic control unit 70, the engine ECU 24, and the motor ECU 40, and are configured by a single electronic control unit. It is good. Further, the “starting control means” may be any means as long as the engine 22 is started by driving the motor MG1 so that the engine 22 is motored in the set starting form. The “generator” is not limited to the motor MG1 configured as a synchronous generator motor, and may be any type of generator such as an induction motor that can input and output power. The “three-axis power input / output means” is not limited to the power distribution / integration mechanism 30 described above, but includes four or more shafts using a double pinion type planetary gear mechanism or a combination of a plurality of planetary gear mechanisms. Any one of the three axes connected to the three axes of the drive shaft, the output shaft, and the rotating shaft of the generator, such as those connected to the motor and those having a different operation action from the planetary gear such as a differential gear As long as the power is input / output to / from the remaining shafts based on the power input / output to / from the power source, any method may be used. The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 according to an embodiment of the present invention. It is a flowchart which shows an example of the engine starting process routine performed by the electronic control unit for hybrids 70 of an Example. It is explanatory drawing which shows an example of the relationship between the battery temperature Tb in the battery 50, and the input / output restrictions Win and Wout. It is explanatory drawing which shows an example of the relationship between the remaining capacity (SOC) of the battery 50, and the correction coefficient of input / output restrictions Win and Wout. It is explanatory drawing of an example of the motoring torque output from motor MG1 in each of a 1st starting form and a 2nd starting form. It is a figure which shows the other example of the motoring torque output from motor MG1 in each of a 1st starting form and a 2nd starting form. It is explanatory drawing showing an example of the motoring torque setting map which sets the motoring torque Tc based on the value of the request | requirement power P * and the battery output restriction | limiting Wout. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example.

Explanation of symbols

  20, 120, 220 Hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 28 damper, 30 power distribution integration mechanism, 31 sun gear, 32 ring gear, 32a ring gear shaft, 33 pinion gear, 34 carrier 35, reduction gear, 40 motor electronic control unit (motor ECU), 41, 42 inverter, 43, 44 rotational position detection sensor, 50 battery, 51 temperature sensor, 52 battery electronic control unit (battery ECU), 54 power line , 60 gear mechanism, 62 differential gear, 63a, 63b drive wheel, 64a, 64b wheel, 70 electronic control unit for hybrid, 72 CPU, 74 ROM, 76 RAM, 80 ignition switch , 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, 89 air conditioner switch, 90 passenger compartment, 92 air conditioner device, 230 rotor motor 232 Inner rotor 234 Outer rotor, MG1, MG2 motor.

Claims (11)

An internal combustion engine capable of outputting power to the drive shaft;
Motoring means capable of motoring the internal combustion engine;
An electric motor capable of outputting driving power;
Power storage means capable of exchanging electric power with the motoring means and the electric motor,
An input / output limit setting means for setting an input / output limit that is an allowable power that may charge and discharge the power storage means based on a state of the power storage means;
When the start request of the internal combustion engine is a request based on the driver's intention and the input / output limit is outside a predetermined output allowable range, the first start mode is set, while the start request is based on the driver's intention. A second start mode that is gentler than the first start mode when the start request is a request based on the driver's intention and the input / output limit is within a predetermined allowable output range. Starting form setting means to perform,
Start control means for driving and controlling the motoring means so that the internal combustion engine is motored with the set start form;
Vehicle equipped with.   The vehicle according to claim 1, wherein the starting mode setting means is a means for setting an output torque of the motoring means that is smaller than the first starting mode as the second starting mode.   The vehicle according to claim 1 or 2, wherein the start mode setting means is a means for setting an output torque of the motoring means that rises more slowly than the first start mode as the second start mode.   The start mode setting means is means for setting the output torque of the motoring means that is smaller as the input / output limit of the power storage means is larger as the first start mode. The vehicle described.   The said starting form setting means is a means to set the output torque of the said motoring means which is so large that the driving | running | working request | requirement by a driver | operator is large as said 1st starting form. vehicle.   The start type setting means is means for making a request based on the intention of the driver when the start request is made based on a travel request by a driver. Vehicle according to item.   The starting mode setting means can charge a drive request for a predetermined auxiliary machine that is driven using the power from the internal combustion engine directly or indirectly and power obtained by converting power from the power from the internal combustion engine. 7. The device according to claim 1, wherein when the start request is made based on at least one of the secondary battery charge requests, the request is not made based on the driver's intention. Vehicle according to item.   The motoring means is connected to a drive shaft connected to an axle and is connected to an output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft. The vehicle according to any one of claims 1 to 7, which is means capable of inputting and outputting power to and from the output shaft.   The motoring means is connected to three axes of a generator for inputting / outputting power, the drive shaft, the output shaft, and a rotating shaft of the generator, and is input / output to any two of the three axes. The vehicle according to claim 1, further comprising: a three-axis power input / output unit that inputs / outputs power to / from the remaining shaft based on power. In a vehicle provided with an internal combustion engine, motoring means capable of motoring the internal combustion engine, an electric motor capable of outputting driving power, and power storage means capable of exchanging electric power with the motoring means and the electric motor. An internal combustion engine start control device for controlling the start of the internal combustion engine,
The input / output limit is a predetermined output allowable range in which the start request of the internal combustion engine is a request based on a driver's intention and is an allowable power that may be charged / discharged for the power storage means set based on the state of the power storage means The first start mode is set when the engine is outside, and when the start request is a request not based on the driver's intention or when the start request is a request based on the driver's intention and the input / output restriction is a predetermined output Start mode setting means for setting a second start mode that is gentler than the first start mode when within an allowable range;
Start control means for driving and controlling the motoring means so that the internal combustion engine is motored with the set start form;
An internal combustion engine start control device comprising: In a vehicle provided with an internal combustion engine, motoring means capable of motoring the internal combustion engine, an electric motor capable of outputting driving power, and power storage means capable of exchanging electric power with the motoring means and the electric motor. A method of starting the internal combustion engine,
An input / output limit that is an allowable maximum power that may charge / discharge the power storage unit is set based on a state of the power storage unit, and the start request of the internal combustion engine is a request based on a driver's intention, and the input / output limit 1 is set when the engine is outside the predetermined output allowable range, while the start request is a request not based on the driver's intention or the start request is a request based on the driver's intention. When the input output limit is within a predetermined output allowable range, a second start mode that is gentler than the first start mode is set, and the motor is motored so that the internal combustion engine is motored with the set start mode. Driving the ring means to start the internal combustion engine;
A method for starting an internal combustion engine.

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