JP2010095222A - Power output device, method of controlling the same, and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further appropriately perform stable output of torque to a driving shaft and charge/discharge according to the characteristic of a secondary battery. <P>SOLUTION: When the battery temperature Tb of a battery having a characteristic that the chargeable maximum power is smaller than the dischargeable maximum power at a temperature lower than a predetermined temperature Tbref is a predetermined temperature Tbref or higher, a predetermined value Hisref is set as hysteresis widths Hisdown and Hisup on the charge and discharge sides (S160 and S180). When the battery temperature Tb is lower than the predetermined temperature Tbref, the predetermined value Hisref is set as the hysteresis width Hisdown on the charge side, and a value smaller than the predetermined value Hisref is set as the hysteresis width Hisup on the discharge side (S160 and S190), and temporary output Pm1 of the first motor is set and temporary torque Tm2tmp of the second motor is restricted (S200 to S230) so as to perform holding as much as possible in a large range by the hysteresis widths Hisdown and Hisup on the charge and discharge sides for a target output Pm1 of the first motor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power output apparatus, a control method therefor, and a vehicle.

Conventionally, as this type of power output apparatus, an engine, a first motor, a planetary gear mechanism in which an output shaft of the engine and a rotor of the first motor are connected to a carrier and a sun gear, respectively, There has been proposed a vehicle equipped with a second motor having a rotor connected to a ring gear and a battery that exchanges electric power with the first motor and the second motor (see, for example, Patent Document 1). In this device, the input / output limit set according to the state of the battery and the target output of the first motor are set within a wide range by a common power width (hysteresis width) on the charge side and discharge side of the battery. The allowable output range of the second motor is set with a deviation from the temporary output of the first motor, and the engine and the two motors are controlled so that the required torque is output to the drive shaft within this range. These power widths (hysteresis widths) are set to be narrower as the absolute value of the input limit or output limit of the battery becomes smaller with the target output of the first motor as the center, so that the second motor can be used when the battery condition is good. Stable power is output to the drive shaft, and when the absolute value of the input restriction or output restriction is small and the battery condition is deteriorated, overcharging and overdischarging of the battery are prevented.
Japanese Patent Laid-Open No. 2004-357459

  In the power output apparatus described above, when a secondary battery such as a lithium ion battery having a characteristic that the maximum power that can be charged is smaller than the maximum power that can be discharged at a low temperature of the battery is used as a battery, stable power is supplied to the drive shaft. In some cases, it is impossible to achieve both the output of the battery and the appropriate protection of the battery. In other words, the output allowable range of the second motor set using the temporary output of the first motor is the actual output allowable range of the second motor obtained by the difference between the input / output limit of the battery and the target output of the first motor. Compared to the battery, it is shifted to the charge side or discharge side of the battery by the same amount of power at the maximum, and it is possible to achieve stable power output to the drive shaft and protection of the battery at high temperature of the battery. When the temperature of the battery is low, charging and discharging according to the characteristics of the battery cannot be performed because the degree to which charging and discharging of the battery are allowed to be stable for stable power output to the drive shaft.

  The main object of the power output apparatus, the control method thereof, and the vehicle of the present invention is to more appropriately perform stable torque output to the drive shaft and charge / discharge according to the characteristics of the secondary battery.

  The power output device, the control method thereof, and the vehicle of the present invention employ the following means in order to achieve at least the above-described main object.

The power output apparatus of the present invention is
An internal combustion engine, a generator capable of inputting / outputting power, a drive shaft, an output shaft of the internal combustion engine, and a rotating shaft of the generator are connected to three shafts and input / output to any two of the three shafts A power output device comprising: a three-shaft power input / output means for inputting / outputting power to / from the remaining shaft based on the generated power; and an electric motor capable of inputting / outputting power to / from the drive shaft,
A secondary battery having charge / discharge characteristics in which power can be exchanged with the generator and the motor and the maximum power that can be discharged is less than the maximum power that can be discharged below a first predetermined temperature;
Input / output limit setting means for setting an input / output limit as the maximum allowable power when charging and discharging the secondary battery based on the charge / discharge characteristics of the secondary battery;
Target operating point setting means for setting a target operating point consisting of a target rotational speed and a target torque for operating the internal combustion engine based on a required torque required for the drive shaft;
Generator target torque setting means for setting a generator target torque to be output from the generator so that the internal combustion engine is operated at a target rotational speed at the set target operation point of the internal combustion engine;
Motor target torque setting means for setting an electric motor target torque to be output from the electric motor so that the required torque is output to the drive shaft based on the set generator target torque and the required torque;
A predetermined charging-side power width that is a power width to the charging side of the secondary battery and a power to the discharging side of the secondary battery with respect to the target output of the generator corresponding to the set generator target torque A generator control output setting means for setting the generator control output so that the generator control output that has been set so far is held as much as possible within a wide range of a predetermined discharge-side power width as a width. When,
A motor output allowable range setting means for setting an output allowable range in which the output of the electric motor is allowed based on a difference between the set input / output limit and the set output for controlling the generator;
Motor control torque setting means for setting the motor control torque by limiting the set motor target torque using the set output allowable range of the motor;
The internal combustion engine is operated at the set target operation point, the set generator target torque is output from the generator, and the set control torque of the motor is output from the motor. A control means for controlling the engine, the generator and the electric motor,
When the temperature of the secondary battery is equal to or higher than a second predetermined temperature that is equal to or lower than the first predetermined temperature, the generator control output setting means is configured to output the predetermined charging side power width and the predetermined discharging side power width. Are set as predetermined power, and the output for controlling the generator is set. When the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charging side power width is set as the predetermined power and the predetermined power is set. Is a means for setting the output for control of the generator with a discharge side power width of less than the predetermined power,
This is the gist.

  In the power output apparatus of the present invention, a target operating point consisting of a target rotational speed at which the internal combustion engine should be operated and a target torque is set on the basis of the required torque required for the drive shaft, and the set target operating point of the internal combustion engine The generator target torque that should be output from the generator is set so that the internal combustion engine is operated at the target rotational speed at, and the secondary battery charging side with respect to the generator target output corresponding to the set generator target torque The control output of the generator that has been set so far within a wide range by a predetermined charge-side power width that is the power width to and a predetermined discharge-side power width that is the power width to the discharge side of the secondary battery Set the generator control output so that it is maintained as much as possible, and set the input / output limit as the maximum allowable power when charging / discharging the secondary battery set based on the charge / discharge characteristics of the secondary battery and the set power generation Machine An electric motor set so that the output allowable range in which the output of the electric motor is allowed is set based on the difference from the control output, and the required torque is output to the drive shaft based on the set generator target torque and the required torque The motor target torque to be output from the motor is limited using the set allowable motor output range to set the motor control torque, and the internal combustion engine is operated at the set target operating point and set from the generator. The internal combustion engine, the generator, and the motor are controlled so that the generator target torque is output and the motor control torque set from the motor is output. Here, the charge / discharge characteristics of the secondary battery are characteristics in which the maximum power that can be charged is smaller than the maximum power that can be discharged at a temperature lower than the first predetermined temperature. When the battery temperature is equal to or higher than a second predetermined temperature, which is a temperature equal to or lower than the first predetermined temperature, the control output of the generator is set with the predetermined charge-side power width and the predetermined discharge-side power width as both predetermined power. When the temperature of the secondary battery is lower than the second predetermined temperature, the control output of the generator is set with the predetermined charge-side power width as the predetermined power and the predetermined discharge-side power width as less than the predetermined power. It is. Therefore, when the battery temperature is equal to or higher than the second predetermined temperature, stable torque output to the drive shaft can be achieved, whereas when the battery temperature is lower than the second predetermined temperature, the generator control output is It is set within the range where the discharge side is smaller than the charge side of the secondary battery with respect to the target output of the generator, and the allowable output range of the motor is compared with the allowable range obtained by the difference between the input / output limit and the target output of the generator. Since the charging side is set to be smaller than the discharging side of the secondary battery, charging of the secondary battery is suppressed and discharging is allowed, and charging / discharging according to the characteristics of the secondary battery can be performed. . As a result, stable torque output to the drive shaft and charge / discharge according to the characteristics of the secondary battery can be performed more appropriately. Here, the “three-axis power input / output means” may be a single pinion type or double pinion type planetary gear mechanism, or may be a differential gear.

  In such a power output apparatus of the present invention, the generator control output setting means is configured to provide the predetermined discharge-side power when the temperature of the secondary battery is equal to or lower than a third predetermined temperature that is lower than the second predetermined temperature. It can also be a means for setting the output for control of the generator with a width of 0. In this case, when the temperature of the secondary battery is lower than the third predetermined temperature, the secondary battery is more reliably suppressed and allowed to discharge, so the secondary battery temperature is lower than the second predetermined temperature. In this case, charging / discharging according to the characteristics of the secondary battery can be performed more appropriately.

  In the power output apparatus of the present invention, the generator control output setting means may be configured such that when the temperature of the secondary battery is lower than the second predetermined temperature, the temperature of the secondary battery is set as the predetermined discharge-side power width. It may be a means for setting the output for control of the generator using electric power that becomes smaller than the predetermined electric power as the temperature becomes lower than the second predetermined temperature. In this way, since the control output of the generator is prevented from suddenly changing due to the temperature change of the secondary battery, a stable torque to the drive shaft can be obtained when the temperature of the secondary battery is lower than the second predetermined temperature. Output can be achieved.

  The vehicle of the present invention is a power output device of the present invention according to any one of the above-described aspects, that is, basically an internal combustion engine, a generator capable of inputting / outputting power, a drive shaft, and an output shaft of the internal combustion engine. And a three-axis power input / output means connected to three axes of the generator and the rotating shaft of the generator and for inputting / outputting power to the remaining shaft based on power input / output to / from any two of the three axes A power output device comprising: an electric motor capable of inputting / outputting power to / from the drive shaft, wherein electric power can be exchanged with the generator and the electric motor, and charging is performed at a maximum dischargeable power below a first predetermined temperature. A secondary battery having a charge / discharge characteristic that reduces the maximum possible power, and an input / output limit as a maximum allowable power when charging / discharging the secondary battery based on the charge / discharge characteristic of the secondary battery. Output limit setting means and required torque required for the drive shaft A target operating point setting means for setting a target operating point consisting of a target rotational speed and a target torque for operating the internal combustion engine, and the internal combustion engine at a target rotational speed at the set target operating point of the internal combustion engine. A generator target torque setting means for setting a generator target torque to be output from the generator to be operated, and the required torque is applied to the drive shaft based on the set generator target torque and the required torque. An electric motor target torque setting means for setting an electric motor target torque to be output from the electric motor to be output; and a charging side of the secondary battery with respect to the target output of the electric generator corresponding to the set electric generator target torque Within a wide range by a predetermined charging-side power width that is the power width to the discharge side and a predetermined discharge-side power width that is the power width to the discharge side of the secondary battery. Generator control output setting means for setting the generator control output so that the generator control output set as much as possible is retained, the set input / output limit and the set generator Motor output allowable range setting means for setting an output allowable range in which the output of the electric motor is allowed based on a difference from the control output of the motor, and the motor target torque set using the set output allowable range of the motor Motor control torque setting means for limiting and setting the motor control torque, and the internal combustion engine is operated at the set target operation point, and the set generator target torque is output from the generator And control means for controlling the internal combustion engine, the generator, and the motor so that the set motor control torque is output from the motor. The generator control output setting means includes the predetermined charging side power width and the predetermined discharging side when the temperature of the secondary battery is equal to or higher than a second predetermined temperature that is equal to or lower than the first predetermined temperature. The control output of the generator is set with both power widths as predetermined power, and when the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charging side power width is set as the predetermined power. The gist of the invention is that a power output device, which is a means for setting a control output of the generator with the predetermined discharge-side power width smaller than the predetermined power, is mounted and an axle is connected to the drive shaft. To do.

  Since the vehicle of the present invention is equipped with the power output device of the present invention according to any one of the above-described aspects, the effects of the power output device of the present invention, for example, stable torque output to the drive shaft and the secondary battery The effect similar to the effect etc. which can perform charging / discharging according to the characteristic of this more appropriately can be show | played.

The method for controlling the power output apparatus of the present invention includes:
An internal combustion engine, a generator capable of inputting / outputting power, a drive shaft, an output shaft of the internal combustion engine, and a rotating shaft of the generator are connected to three shafts and input / output to any two of the three shafts A three-shaft power input / output means for inputting / outputting power to / from the remaining shaft based on the generated power, an electric motor capable of inputting / outputting power to / from the drive shaft, and exchange of electric power with the generator and the motor. A secondary battery having charge / discharge characteristics in which the maximum power that can be charged is smaller than the maximum power that can be discharged at a temperature lower than the first predetermined temperature;
(A) A target operating point consisting of a target rotational speed and a target torque for operating the internal combustion engine is set based on a required torque required for the drive shaft, and a target rotation at the set target operating point of the internal combustion engine is set. Set the generator target torque to be output from the generator so that the internal combustion engine is operated in number,
(B) a predetermined charging side power width that is a power width to the charging side of the secondary battery with respect to the target output of the generator corresponding to the set generator target torque and the discharging side of the secondary battery Set the generator control output so that the generator control output that has been set so far within a wide range by a predetermined discharge side power width that is the power width to
(C) By the difference between the input / output restriction as the maximum allowable power when charging / discharging the secondary battery set based on the charge / discharge characteristics of the secondary battery and the set output for controlling the generator Set an output allowable range in which the output of the electric motor is allowed,
(D) Based on the set generator target torque and the required torque, the set electric motor target motor target torque to be output from the electric motor set to output the required torque to the drive shaft Set the control torque of the electric motor to be limited using the output allowable range of
(E) The internal combustion engine is operated at the set target operating point, the set generator target torque is output from the generator, and the set motor control torque is output from the motor. Controlling the internal combustion engine, the generator and the electric motor,
A method for controlling a power output device,
In the step (b), when the temperature of the secondary battery is equal to or higher than a second predetermined temperature that is equal to or lower than the first predetermined temperature, the predetermined charging-side power width and the predetermined discharging-side power width are set. In any case, the control output of the generator is set as predetermined power, and when the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charging side power width is set as the predetermined power and the predetermined discharge is performed. Setting the output for control of the generator with a side power width smaller than the predetermined power,
It is characterized by that.

  In this method of controlling a power output apparatus of the present invention, a target operating point consisting of a target rotational speed at which the internal combustion engine is to be operated and a target torque is set based on the required torque required for the drive shaft, and the set internal combustion engine The generator target torque to be output from the generator is set so that the internal combustion engine is operated at the target rotational speed at the target operating point, and the secondary battery is set against the generator target output corresponding to the set generator target torque. Control of the generator set so far within a wide range by a predetermined charge side power width that is the power width to the charge side of the battery and a predetermined discharge side power width that is the power width to the discharge side of the secondary battery I / O restriction and setting as the maximum allowable power when charging / discharging the secondary battery set based on the charge / discharge characteristics of the secondary battery The The output allowable range within which the motor output is allowed is set based on the difference from the generator control output, and the required torque is output to the drive shaft based on the set generator target torque and the required torque. The motor target torque to be output from the set motor is limited using the set output allowable range of the motor to set the motor control torque, and the internal combustion engine is operated at the set target operation point and generates power. The internal combustion engine, the generator, and the motor are controlled so that the generator target torque set from the machine is output and the control torque of the motor set from the motor is output. Here, the charge / discharge characteristics of the secondary battery are characteristics in which the maximum power that can be charged is smaller than the maximum power that can be discharged at a temperature lower than the first predetermined temperature. When the battery temperature is equal to or higher than a second predetermined temperature, which is a temperature equal to or lower than the first predetermined temperature, the control output of the generator is set with the predetermined charge-side power width and the predetermined discharge-side power width as both predetermined power. When the temperature of the secondary battery is lower than the second predetermined temperature, the control output of the generator is set with the predetermined charge-side power width as the predetermined power and the predetermined discharge-side power width as less than the predetermined power. It is. Therefore, when the battery temperature is equal to or higher than the second predetermined temperature, stable torque output to the drive shaft can be achieved, whereas when the battery temperature is lower than the second predetermined temperature, the generator control output is It is set within a range where the discharge side is smaller than the charge side of the secondary battery with respect to the target output of the generator, and the allowable output range of the motor is compared with the allowable range obtained by the difference between the input / output limit and the target output of the generator. Since the charging side is set to be smaller than the discharging side of the secondary battery, charging of the secondary battery is suppressed and discharging is allowed, and charging / discharging according to the characteristics of the secondary battery can be performed. . As a result, stable torque output to the drive shaft and charge / discharge according to the characteristics of the secondary battery can be performed more appropriately. Here, the “three-axis power input / output means” may be a single pinion type or double pinion type planetary gear mechanism, or may be a differential gear.

  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 engine ECU 24 also calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22 based on a signal from a crank position sensor (not shown) attached to the crankshaft 26.

  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. 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 motor ECU 40 also calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on signals from the rotational position detection sensors 43 and 44.

  The battery 50 is configured as a lithium ion secondary battery, and 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 53, the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input, and data on the state of the battery 50 is electronically controlled for communication by communication as necessary. Output to unit 70. Further, the battery ECU 52 calculates the remaining capacity SOC based on the integrated value of the charge / discharge current detected by the current sensor 53 in order to manage the battery 50, or based on the calculated remaining capacity SOC and the battery temperature Tb. Input / output limits Win and Wout, which are the maximum allowable power that can charge and discharge the battery 50, are calculated. 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, with the charge side being negative and the discharge side being positive. Based on this, the output restriction correction coefficient and the input restriction correction coefficient are set, and the basic values of the set input / output restrictions Win and Wout can be multiplied by the correction coefficient. FIG. 2 shows an example of the relationship between the battery temperature Tb and the basic values of the input / output limits Win and Wout, and FIG. 3 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 and Wout. . In FIG. 2, the dotted line shows the inverted value of the basic value of the output limit Wout, and the first temperature Tb1 is the negative battery temperature Tb when the value 0 is set as the basic value of the input / output limits Win, Wout. Indicates. As illustrated, in the embodiment, when the battery temperature Tb of the battery 50 is lower than a predetermined temperature Tbref (for example, 0 ° C., 5 ° C., 10 ° C., etc.), the maximum chargeable power becomes smaller than the maximum dischargeable power. A lithium ion secondary battery having characteristics is used, and each basic value is set such that the absolute value of the input limit Win is smaller than the output limit Wout when the battery temperature Tb is lower than the predetermined temperature Tbref and higher than the first temperature Tb1. Therefore, the basic values of the input / output limits Win and Wout are set based on the charge / discharge characteristics of the battery 50. This characteristic is based on the fact that, when the battery voltage changes suddenly due to charging while the internal resistance of the battery is relatively large at low temperatures, inconveniences such as irreversible deposition of lithium occur more easily than at high temperatures.

  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. The accelerator pedal opening Acc from the vehicle, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, and the like are 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, and the battery ECU 52 via the communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52. ing.

  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 is output from the engine 22, and all of the power output from the engine 22 is the power distribution and integration mechanism 30. Torque conversion operation mode for driving and controlling the motor MG1 and the motor MG2 so that the torque is converted by the motor MG1 and the motor MG2 and output to the ring gear shaft 32a, and the required power and the power required for charging and discharging the battery 50. The engine 22 is operated and controlled so that suitable power is output from the engine 22, and all or part of the power output from the engine 22 with charging / discharging of the battery 50 is the power distribution and integration mechanism 30, the motor MG1, and the motor. The required power is converted to the ring gear shaft 32 with torque conversion by MG2. Charge / discharge operation mode in which the motor MG1 and the motor MG2 are driven and controlled so as to be output to each other, and a motor operation mode in which the operation of the engine 22 is stopped and the power corresponding to the required power from the motor MG2 is output to the ring gear shaft 32a. and so on.

  Next, the operation of the thus configured hybrid vehicle 20 of the embodiment will be described. FIG. 5 is a flowchart showing an example of a drive control routine executed by the hybrid electronic control unit 70. This routine is repeatedly executed every predetermined time (for example, every several msec).

  When the drive control routine is executed, first, the CPU 72 of the hybrid electronic control unit 70 first determines the accelerator opening Acc from the accelerator pedal position sensor 84, the vehicle speed V from the vehicle speed sensor 88, the rotational speed Nm1, of the motors MG1, MG2. A process of inputting data necessary for control, such as Nm2, battery temperature Tb of the battery 50, input / output restrictions Win and Wout of the battery 50, is executed (step S100). Here, the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 are input from the motor ECU 40 by communication from those calculated based on the rotational positions of the rotors of the motors MG1 and MG2 detected by the rotational position detection sensors 43 and 44. To do. Further, the battery temperature Tb of the battery 50 is detected by a temperature sensor 51 attached to the battery 50 and input from the battery ECU 52 by communication. Further, the input / output limits Win and Wout of the battery 50 are set based on the battery temperature Tb of the battery 50 and the remaining capacity (SOC) of the battery 50 so that the charge / discharge characteristics of the battery 50 are reflected. It was supposed to be input via communication.

  When the data is thus input, the required torque Tr * to be output to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b as the torque required for the vehicle based on the input accelerator opening Acc and the vehicle speed V. And the required power Pe * required for the engine 22 is set (step S110). In the embodiment, the required torque Tr * is determined 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, and the accelerator opening Acc, the vehicle speed V, , The corresponding required torque Tr * is derived and set from the stored map. FIG. 5 shows an example of the required torque setting map. The required power Pe * is calculated by subtracting the charge / discharge required power Pb * required by the battery 50 from the product of the set required torque Tr * and the rotation speed Nr of the ring gear shaft 32a, and further adding a loss Loss. Can do. Here, when the remaining capacity SOC of the battery 50 is larger than a target range (for example, a range of 55% or more and 65% or less), the charge / discharge request power Pb * is set to a positive value as a discharge request and is smaller than the target value. Sometimes, a negative value can be used as a charge request. The rotational speed Nr of the ring gear shaft 32a is obtained by multiplying the vehicle speed V by a conversion factor k (Nr = k · V), or the rotational speed Nm2 of the motor MG2 is divided by the gear ratio Gr of the reduction gear 35 (Nr = Nm2 / Gr).

  Subsequently, a target rotational speed Ne * and a target torque Te * are set as operating points at which the engine 22 should be operated based on the set required power Pe * (step S120). This setting is performed based on the operation line for efficiently operating the engine 22 and the required power Pe *. FIG. 6 shows an example of the operation line of the engine 22 and how the target rotational speed Ne * and the target torque Te * are set. As shown in the figure, the target rotational speed Ne * and the target torque Te * can be obtained from the intersection of the operation line and a curve with a constant required power Pe * (Ne * × Te *).

  Next, using the set target rotational speed Ne *, the rotational speed Nr (Nm2 / Gr) of the ring gear shaft 32a, and the gear ratio ρ of the power distribution and integration mechanism 30, the target rotational speed Nm1 of the motor MG1 is given by the following equation (1). * And a torque command Tm1 * of the motor MG1 based on the calculated target rotation speed Nm1 * and the current rotation speed Nm1 (2) based on the calculated rotation speed Nm1 * (step S130). Using * and the gear ratio ρ of the power distribution and integration mechanism 30 and the gear ratio Gr of the reduction gear 35, a temporary torque Tm2tmp as a provisional value of the torque to be output from the motor MG2 is calculated by equation (3) (step S140). ). Here, Expression (1) is a dynamic relational expression for the rotating element of the power distribution and integration mechanism 30. FIG. 7 shows an example of a collinear diagram showing the dynamic relationship between the rotational speed and torque in the rotating elements of the power distribution and integration mechanism 30. In the figure, the left S-axis indicates the rotation speed of the sun gear 31 that is the rotation speed Nm1 of the motor MG1, the C-axis indicates the rotation speed of the carrier 34 that is the rotation speed Ne of the engine 22, and the R-axis indicates the rotation speed of the motor MG2. The rotational speed Nr of the ring gear 32 obtained by dividing the number Nm2 by the gear ratio Gr of the reduction gear 35 is shown. Expression (1) can be easily derived by using this alignment chart. The two thick arrows on the R axis indicate that the torque Tm1 output from the motor MG1 acts on the ring gear shaft 32a and the torque Tm2 output from the motor MG2 acts on the ring gear shaft 32a via the reduction gear 35. Torque. Expression (2) is a relational expression in feedback control for rotating the motor MG1 at the target rotational speed Nm1 *. In Expression (2), “k1” in the second term on the right side is a gain of a proportional term. “K2” in the third term on the right side is the gain of the integral term. Equation (3) can be easily derived from the alignment chart of FIG.

Nm1 * = Ne * ・ (1 + ρ) / ρ-Nm2 / (Gr ・ ρ) (1)
Tm1 * = previous Tm1 * + k1 (Nm1 * -Nm1) + k2∫ (Nm1 * -Nm1) dt (2)
Tm2tmp = (Tr * + Tm1 * / ρ) / Gr (3)

  When the torque command Tm1 * of the motor MG1 and the temporary torque Tm2tmp of the motor MG2 are calculated in this way, the power consumption is positive and the generated power is multiplied by the calculated torque command Tm1 * of the motor MG1 and the input rotational speed Nm1 of the motor MG1. Calculation is made as the target output Pm1 of the negative motor MG1 (step S150). Then, the output of the motor MG1 when setting the output limit of the motor MG2 by subtracting the output of the motor MG1 from the input limit Win and the output limit Wout of the battery 50 (hereinafter referred to as the temporary output Pm1his of the motor MG1) is set. A predetermined value Hisref is set to the charge side hysteresis width Hisdown to be used (step S160), and the input battery temperature Tb of the battery 50 is checked (step S170). When the battery temperature Tb is equal to or higher than the predetermined temperature Tbref, the temporary output of the motor MG1 is obtained. A predetermined value Hisref is also set to the discharge-side hysteresis width Hisdown used for setting Pm1his (step S180). Here, the predetermined temperature Tbref is the temperature illustrated in FIG. 2 used when setting the basic value of the input limit Win of the battery 50. The charge / discharge side hysteresis widths Hisdown, Hisup and the predetermined value Hisref will be described next.

  Subsequently, the temporary output Pm1his of the motor MG1 is expressed by the following equation using the set charge / discharge hysteresis widths Hisdown, Hisup and the temporary output Pm1his (previous Pm1his) of the motor MG1 previously set when this routine was executed: (4) is set (step S200). FIG. 8 shows how the provisional output Pm1his of the motor MG1 is set. In the drawing, a thick solid line indicates the target output Pm1 of the motor MG1, and a broken line indicates the temporary output Pm1his of the motor MG1. As shown in FIG. 8 and Expression (4), the previous Pm1his of the motor MG1 is a value larger than the target output Pm1 of the motor MG1 by the discharge-side hysteresis width Hisup, and a value smaller than the target output Pm1 of the motor MG1 by the charging-side hysteresis width Hisdown. Is within the range, the previous Pm1his is set as the temporary output Pm1his, and when the previous Pm1his is not within this range, the temporary output Pm1his is changed and set to be within the range. Since the temporary output Pm1his of the motor MG1 is directly reflected in the calculation of output limits Pm2min and Pm2max and torque limits Tm2min and Tm2max of the motor MG2, which will be described later, the temporary output Pm1his of the motor MG1 is charged / discharge-side hysteresis with respect to the target output Pm1. The torque limits Tm2min and Tm2max of the motor MG2 are prevented from being frequently changed by adjusting the widths Hisdown and Hisup (both of which are predetermined values Hisref) to be as constant as possible within a wide range. . Therefore, the charging-side hysteresis width Hisdown calculates the torque limits Tm2min and Tm2max of the motor MG2 using the temporary output Pm1his on the charging side of the battery 50 from the target output Pm1 that generates power from the target output Pm1 of the motor MG1. The discharge side hysteresis width Hisup is the torque of the motor MG2 using the temporary output Pm1his that consumes power from the target output Pm1 of the motor MG1, that is, the discharge side of the battery 50 from the target output Pm1. It can be said that the power width is used to calculate the limits Tm2min and Tm2max. In addition, in the embodiment, the predetermined value Hisref is a value determined in advance by experiments or the like as a value that can suppress a sudden change in the torque limits Tim2min and Tm2max of the motor MG2 and reduce a sense of discomfort to the driver. .

  Pm1his = min (max (previous Pm1his, Pm1-Hisdown), Pm1 + Hisup) (4)

  When the temporary output Pm1his of the motor MG1 is set in this way, the output limit as the upper and lower limits of the power that may be output from the motor MG2 by subtracting the set temporary output Pm1his of the motor MG1 from the input / output limits Win and Wout of the input battery. Pm2min and Pm2max are calculated by the following equations (5) and (6) (step S210), and the calculated output limit Pm2min and Pm2max of the motor MG2 is divided by the rotational speed Nm2 of the motor MG2 to be output from the motor MG2. Torque limits Tm2min and Tm2max as upper and lower limits of good torque are calculated by formulas (7) and (8) (step S220), and the torque command of the motor MG2 is set as a value obtained by limiting the temporary torque Tm2tmp with the calculated torque limits Tm2in and Tm2max. Set up Tm2 * (Step S230). The process of setting the output limits Pm2min and Pm2max of the motor MG2 is a process of setting the upper limit value and the lower limit value of the output allowable range in which the output power of the motor MG2 is allowed, so the output allowable range of the motor MG2 is set. It can be said that the processing to be performed.

Pm2min = Win-Pm1his (5)
Pm2max = Wout-Pm1his (6)
Tm2min = Pm1his / Nm2 (7)
Tm2max = Pm1his / Nm2 (8)

  When the target rotational speed Ne * of the engine 22 and the target torque Te * and the torque commands Tm1 * and Tm2 * of the motors MG1 and MG2 are set in this way, the target rotational speed Ne * and the target torque Te * of the engine 22 are set in the engine ECU 24. The torque commands Tm1 * and Tm2 * for the motors MG1 and MG2 are transmitted to the motor ECU 40 (step S240), and the drive control routine is terminated. The engine ECU 24 that has received the target rotational speed Ne * and the target torque Te * performs fuel injection control in the engine 22 such that the engine 22 is operated at an operating point indicated by the target rotational speed Ne * and the target torque Te *. Controls such as ignition control. The motor ECU 40 that has received the torque commands Tm1 * and Tm2 * controls the switching elements of the inverters 41 and 42 so that the motor MG1 is driven by the torque command Tm1 * and the motor MG2 is driven by the torque command Tm2 *. To do. By such control, when the battery temperature Tb of the battery 50 is equal to or higher than the predetermined temperature Tbref, frequent changes in the torque limits Tm2min and Tm2max of the motor MG2 can be suppressed, and the required torque is applied to the ring gear shaft 32a as the drive shaft. The vehicle can travel while outputting a stable torque based on Tr *.

  When the battery temperature Tb of the battery 50 is lower than the predetermined temperature Tbref in step S170, the discharge-side hysteresis width Hisup is set based on the input battery temperature Tb (step S190), and the set charge / discharge-side hysteresis widths Hisdown, Hisup are used. Then, the temporary output Pm1his of the motor MG1 is set (step S200), and the output limits Pm2min and Pm2max and the torque limits Tm2min and Tm2max of the motor MG2 are calculated based on the set temporary output Pm1his of the motor MG1 (steps S210 and S210). The temporary torque Tm2tmp is limited by the calculated torque limits Tm2min and Tm2max to set the torque command Tm2 * of the motor MG2 (step S230), and the target rotation of the engine 22 of the set engine 22 is set. Ne *, the target torque Te * and motor MG1, MG2 torque command Tm1 *, and sends Tm2 * and to the engine ECU24 and the motor ECU40, respectively (step S240), and terminates the drive control routine. Here, in the embodiment, the discharge-side hysteresis width Hisup is determined in advance by storing the relationship between the battery temperature Tb and the discharge-side hysteresis width Hisup in the ROM 74 as a discharge-side hysteresis width setting map. , The corresponding discharge-side hysteresis width Hisup is derived from the stored map and set. FIG. 9 shows an example of the discharge side hysteresis width setting map. As shown in the figure, the discharge-side hysteresis width Hisup becomes smaller than the predetermined value Hisref as the battery temperature Tb becomes lower in the range below the predetermined temperature Tbref, and the value 0 is set when the battery temperature Tb is equal to or lower than the second temperature Tb2. In the embodiment, the second temperature Tb2 is a negative temperature higher than the first temperature Tb1 illustrated in FIG. 2 (for example, −10 ° C. or −5 ° C.).

  A transient state in which the accelerator pedal 83 is depressed while the battery 50 is traveling at a low temperature, and the target output Pm1 of the motor MG1 that is consuming electric power due to the output of the positive torque is reduced toward the value 0 on the positive side. think of. At this time, the temporary output Pm1his of the motor MG1 is more charged than the target output Pm1 as shown in time t1 to time t2 in FIG. 8 so that the temporary output Pm1his is maintained as much as possible even if the target output Pm1 changes. It is conceivable to shift from a small value to a value that is larger than the target output Pm1 by the discharge-side hysteresis width Hisup, and the output limit Pm2max (= Wout−Pm1his) that is the maximum output power allowed for control by the motor MG2 is actually allowed. Smaller than the maximum output power (Wout−Pm1). If the same predetermined value Hisref is set for both the charge and discharge hysteresis widths Hisdown and Hisup regardless of the battery temperature Tb, the absolute value of the input limit Win is sufficiently large to protect the battery 50 at low temperatures. In spite of the small setting, the battery 50 is charged with excessive power while the output limit Pm2max of the motor MG2 is below the input limit Win, and the battery 50 cannot be protected. Therefore, in the hybrid vehicle 20 of the embodiment, when the battery temperature Tb of the battery 50 is a low temperature lower than the predetermined temperature Tbref, the discharge-side hysteresis width Hisup is smaller than the predetermined value Hisref (for example, the value when the battery temperature Tb is equal to or lower than the second temperature Tb2). The battery 50 is protected by setting to 0 or the like. That is, when the battery 50 is at a low temperature, the discharge-side hysteresis width Hisup is set smaller than the charge-side hysteresis width Hisdown, so that the temporary output Pm1his of the motor MG1 is smaller on the discharge side than the charge side of the battery 50 with respect to the target output Pm1. The output allowable range determined by the output limits Pm2max and Pm2min of the motor MG2 is compared with the actual allowable range obtained by the difference between the target output Pm1 of the motor MG1 and the input / output limits Win and Wout of the battery 50. Therefore, the characteristics of the battery 50 are set so that the degree of deviation to the charging side is smaller than the degree of deviation to the discharging side of the battery 50 (for example, the battery temperature Tb is not shifted to the charging side when the battery temperature Tb is equal to or lower than the second temperature Tb2). Charging / discharging according to can be performed. As a result, when the battery temperature Tb is equal to or higher than the predetermined temperature Tbref, the vehicle can travel while outputting a stable torque based on the required torque Tr * to the ring gear shaft 32a as the drive shaft, and when the battery temperature Tb is lower than the predetermined temperature Tbref. Charge / discharge according to the characteristics of the battery 50 can be performed.

  According to the hybrid vehicle 20 of the embodiment described above, when the battery temperature Tb of the battery 50 is equal to or higher than the predetermined temperature Tbref, the charge / discharge side hysteresis widths Hisdown, Hisup are both set to the predetermined value Hisref, and the battery temperature Tb of the battery 50 is set. Is less than the predetermined temperature Tbref, the charging side hysteresis width Hisdown is set to a predetermined value Hisref and the discharge side hysteresis width Hisup is set to a value smaller than the predetermined value Hisref, and the charging / discharging side set for the target output Pm1 of the motor MG1 Since the temporary output Pm1 of the motor MG1 is set to limit the temporary torque Tm2tmp of the motor MG2 so as to be held as much as possible within the wide ranges of the hysteresis widths Hisdown and Hisup, the stable torque of the ring gear shaft 32a to the drive shaft can be reduced. It can be performed charging and discharging and in accordance with the characteristics of the power and the battery 50 more properly. In addition, even when the battery temperature Tb of the battery 50 is less than the predetermined temperature Tbref, the temporary output Pm1his of the motor MG1 is set by setting the charging-side hysteresis width Hisdown and the discharge-side hysteresis width Hisup. Torque output can be achieved. Further, when the battery temperature Tb of the battery 50 is equal to or lower than the second temperature Tb2, which is a temperature lower than the predetermined temperature Tbref, the value 0 is set in the discharge-side hysteresis width Hisup. When the battery temperature Tb is less than the predetermined temperature Tbref, charging / discharging according to the characteristics of the battery 50 can be performed more appropriately. Further, as the battery temperature Tb of the battery 50 becomes lower than the predetermined temperature Tbref, the discharge-side hysteresis width Hisup is set to a value smaller than the predetermined value Hisref, and the temporary change Pm1his of the motor MG1 is prevented from suddenly changing due to the change in the battery temperature Tb. Therefore, even when the battery temperature Tb is lower than the predetermined temperature Tbref, it is possible to output a stable torque to the ring gear shaft 32a.

  In the hybrid vehicle 20 of the embodiment, when the battery temperature Tb of the battery 50 is less than the predetermined temperature Tbref, the discharge-side hysteresis width Hisup is set to a value that becomes smaller than the predetermined value Hisref as the battery temperature Tb becomes lower than the predetermined temperature Tbref. Although the value 0 is set below the second temperature Tb2, a value smaller than the predetermined value Hisref is set as the battery temperature Tb becomes lower than the predetermined temperature Tbref, and the predetermined value Hisref2 larger than the value 0 is set below the second temperature Tb2. Or a predetermined value Hisref3 that is smaller than the predetermined value Hisref and larger than the value 0 may be set when the battery temperature Tb is lower than the predetermined temperature Tbref, or a value 0 when the battery temperature Tb is lower than the predetermined temperature Tbref. As the one to set There.

  In the hybrid vehicle 20 of the embodiment, when the battery temperature Tb of the battery 50 is equal to or higher than the predetermined temperature Tbref, the charge / discharge side hysteresis widths Hisdown and Hisup are both set to the predetermined value Hisref while the battery temperature Tb is lower than the predetermined temperature Tbref. The charging side hysteresis width Hisdown is set to a predetermined value Hisref and the discharging side hysteresis width Hisup is set to a value smaller than the predetermined value Hisref. However, the battery temperature Tb is lower than the predetermined temperature Tb and higher than the second temperature Tb2. When the battery temperature Tb is lower than the predetermined temperature Tbref2, the charge-side hysteresis width Hisdown is set to the predetermined value Hi when the battery temperature Tb is lower than the predetermined temperature Tbref2. It may set the predetermined value Hisref value less than the discharge side hysteresis width Hisup sets the ref.

  In the hybrid vehicle 20 of the embodiment, the power of the motor MG2 is changed by the reduction gear 35 and output to the ring gear shaft 32a. However, as illustrated in the hybrid vehicle 120 of the modification of FIG. May be output to an axle (an axle connected to the wheels 64a and 64b in FIG. 10) different from an axle to which the ring gear shaft 32a is connected (an axle to which the drive wheels 63a and 63b are connected).

  In addition, it is not limited to those applied to such hybrid vehicles, but is incorporated into non-moving equipment such as forms of power output devices mounted on moving bodies such as vehicles other than automobiles, ships, and aircraft, and construction equipment. A power output device may be used. Furthermore, it is good also as a form of the control method of such a power output device.

  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 motor MG1 corresponds to a “generator”, the power distribution / integration mechanism 30 corresponds to a “three-axis power input / output unit”, and the motor MG2 corresponds to a “motor”. The battery 50 corresponds to a “secondary battery”, and a basic value is set based on the battery temperature Tb of the battery 50, that is, based on the charge / discharge characteristics of the battery 50, and based on the remaining capacity SOC. The battery ECU 52 that sets the input / output limits Win and Wout, which are the maximum allowable power that may be charged / discharged by correcting the battery 50, corresponds to the “input / output limit setting means”, and the ring gear shaft 32a as the drive shaft A required power Pe * of the engine 22 corresponding to the required torque Tr * to be output is set, and the engine 22 is operated as an operating point based on the required power Pe *. The hybrid electronic control unit 70 that executes the processing of steps S110 and S120 of the drive control routine of FIG. 4 for setting the target rotational speed Ne * and the target torque Te * corresponds to the “target operation point setting means”, and the engine 22 4 for calculating the target rotational speed Nm1 * of the motor MG1 and calculating the torque command Tm1 * of the motor MG1 so as to be operated at the target rotational speed Ne *. The control unit 70 corresponds to “generator target torque setting means”, and calculates a temporary torque Tm2tmp that is a temporary value of torque to be output from the motor MG2 based on the required torque Tr * and the torque command Tm1 * of the motor MG1. The hybrid electronic control unit that executes the process of step S140 of the drive control routine of FIG. 70 corresponds to “motor target torque setting means”, calculates a target output Pm1 corresponding to the torque command Tm1 * of the motor MG1, sets a predetermined value Hisref to the charging side hysteresis width Hisdown, and sets the battery temperature Tb to the predetermined temperature Tbref. The drive control of FIG. 4 sets the temporary output Pm1his of the motor MG1 so as to be held as much as possible using the target output Pm1 and the charge / discharge side hysteresis widths Hisdown, Hisup. The hybrid electronic control unit 70 that executes the processing of steps S150 to S200 of the routine corresponds to the “generator control output setting means”, and is based on the difference between the input / output limits Win and Wout of the battery 50 and the temporary output Pm1his of the motor MG1. Motor MG2 output limit Pm2m The hybrid electronic control unit 70 that executes the process of step S210 of the drive control routine of FIG. 4 for calculating in, Pm2max corresponds to the “motor output allowable range setting means”, and the output limits Pm2min, Pm2max of the motor MG2 are set to the rotational speed. Divide by Nm2 to calculate the torque limits Tm2min, Tm2max of the motor MG2, and limit the provisional torque Tm2tmp by these to set the torque command Tm2 * of the motor MG2, and execute the processing of steps S220 and S230 of the drive control routine of FIG. The hybrid electronic control unit 70 corresponds to “motor control torque setting means”, and outputs the target rotational speed Ne * and target torque Te * of the engine 22 and torque commands Tm1 * and Tm2 * of the motors MG1 and MG2, respectively, to the engine ECU 24, Send to motor ECU 40 The hybrid electronic control unit 70 that executes step S240 of the drive control routine of FIG. 4, the engine ECU 24 that controls the engine 22 based on the target rotational speed Ne * and the target torque Te *, and torque commands Tm1 * and Tm2 *. The motor ECU 40 that controls the motors MG1, MG2 based on the above corresponds to “control means”.

  Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon fuel such as gasoline or light oil, and may be any type of internal combustion engine such as a hydrogen engine. The “generator” is not limited to the motor MG1 configured as a synchronous generator motor, and may be any type of generator as long as it can input and output power, such as an induction motor. 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. Connected to the three shafts of the drive shaft, the output shaft of the internal combustion engine, and the rotating shaft of the generator, such as those connected to the shaft and those having a differential action different from the planetary gear such as a differential gear. As long as power is input / output to / from the remaining shafts based on the power input / output to / from any of the two shafts, any configuration 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 input and output power to the drive shaft, such as an induction motor. . The “secondary battery” is not limited to the battery 50 as a lithium ion secondary battery, and can exchange power with the generator and the motor, and is charged from the maximum power that can be discharged at a temperature lower than the first predetermined temperature. Any type of secondary battery may be used as long as it has charge / discharge characteristics that reduce the maximum possible power. The “input / output limit setting means” is not limited to the one that calculates the input / output limits Win and Wout based on the battery temperature Tb and the remaining capacity SOC of the battery 50, but the battery temperature Tb and the remaining capacity SOC. In addition, for example, setting an input / output limit as the maximum allowable power when charging / discharging the secondary battery based on the charge / discharge characteristics of the secondary battery, such as a calculation based on the internal resistance of the battery 50, etc. It does not matter as long as it is anything. As the “target operation point setting means”, a target rotational speed Ne * and a target torque Te * are set as operation points at which the engine 22 should be operated based on the required power Pe * corresponding to the required torque Tr *. The present invention is not limited, and any configuration may be used as long as a target operating point including a target rotational speed and a target torque for operating the internal combustion engine is set based on a required torque required for the drive shaft. The “generator target torque setting means” is limited to the one that calculates the target rotational speed Nm1 * of the motor MG1 and calculates the torque command Tm1 * of the motor MG1 so that the engine 22 is operated at the target rotational speed Ne *. Instead, any generator target torque to be output from the generator may be set so that the internal combustion engine is operated at the target rotational speed at the set target operation point of the internal combustion engine. The “motor target torque setting means” is not limited to the one that calculates the temporary torque Tm2tmp of the motor MG2 based on the required torque Tr * and the torque command Tm1 * of the motor MG1. As long as the motor target torque to be output from the electric motor is set so that the required torque is output to the drive shaft based on the torque and the required torque, any method may be used. The “generator control output setting means” calculates the target output Pm1 corresponding to the torque command Tm1 * of the motor MG1, and sets the charge / discharge side hysteresis widths Hisdown, Hisup and temporarily outputs the motor MG1 so as to be held as much as possible. It is not limited to the one that sets Pm1his, a predetermined charging-side power width that is a power width to the charging side of the secondary battery with respect to the target output of the generator corresponding to the set generator target torque, and Set the generator control output so that the generator output that has been set so far is kept as much as possible within a wide range by the predetermined discharge side power width to the discharge side of the secondary battery. In this case, when the temperature of the secondary battery is equal to or higher than a second predetermined temperature, which is a temperature equal to or lower than the first predetermined temperature, a predetermined charging side power width and a predetermined discharging side power Are set as predetermined power, and the output for control of the generator is set. When the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charge side power width is set to the predetermined power and the predetermined discharge side power width is set to the predetermined power. As long as the output for control of the generator is set as the electric power smaller than the predetermined electric power, it may be anything. The “control means” is not limited to the combination of the hybrid electronic control unit 70, the engine ECU 24, and the motor ECU 40, and may be configured by a single electronic control unit. The “control means” controls the engine 22 based on the target rotational speed Ne * and the target torque Te * of the engine 22 and motors MG1, MG2 based on the torque commands Tm1 *, Tm2 * of the motors MG1, MG2. The control torque of the motor set from the motor is output by outputting the generator target torque set from the generator and operating the internal combustion engine at the set target operation point. Any device may be used as long as it controls the internal combustion engine, the generator, and the motor so that the output is output.

  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 best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the power output apparatus and the vehicle manufacturing industry.

It is a block diagram which shows the outline of a structure of the hybrid vehicle 20 carrying the power output device which is one Example of this invention. It is explanatory drawing which shows an example of the relationship between the battery temperature Tb of the battery 50, and the basic value of 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 a flowchart which shows an example of the drive control routine performed by the electronic control unit for hybrids 70 of an Example. It is explanatory drawing which shows an example of the map for request | requirement torque setting. It is explanatory drawing which shows a mode that an example of the operating line of the engine 22, the target rotational speed Ne *, and the target torque Te * are set. FIG. 3 is an explanatory diagram showing an example of a collinear diagram showing a dynamic relationship between the number of rotations and torque in a rotating element of a power distribution and integration mechanism 30 when traveling with power output from an engine 22; It is explanatory drawing which shows an example of a mode that the temporary output Pm1his of motor MG1 is set. It is explanatory drawing which shows an example of the map for discharge side hysteresis width setting. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification.

Explanation of symbols

  20,120 Hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 24a CPU, 24b ROM, 24c RAM, 26 crankshaft, 28 damper, 30 power distribution integrated 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 Rotation position detection sensor, 50 battery, 51 Temperature sensor, 52 Battery electronic control unit ( Battery ECU), 53 current sensor, 54 power line, 60 gear mechanism, 62 differential gear, 63a, 63b driving 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, MG1, MG2 motor.

Claims (5)

An internal combustion engine, a generator capable of inputting / outputting power, a drive shaft, an output shaft of the internal combustion engine, and a rotating shaft of the generator are connected to three shafts and input / output to any two of the three shafts A power output device comprising: a three-shaft power input / output means for inputting / outputting power to / from the remaining shaft based on the generated power; and an electric motor capable of inputting / outputting power to / from the drive shaft,
A secondary battery having charge / discharge characteristics in which power can be exchanged with the generator and the motor and the maximum power that can be discharged is less than the maximum power that can be discharged below a first predetermined temperature;
Input / output limit setting means for setting an input / output limit as the maximum allowable power when charging and discharging the secondary battery based on the charge / discharge characteristics of the secondary battery;
Target operating point setting means for setting a target operating point consisting of a target rotational speed and a target torque for operating the internal combustion engine based on a required torque required for the drive shaft;
Generator target torque setting means for setting a generator target torque to be output from the generator so that the internal combustion engine is operated at a target rotational speed at the set target operation point of the internal combustion engine;
Motor target torque setting means for setting an electric motor target torque to be output from the electric motor so that the required torque is output to the drive shaft based on the set generator target torque and the required torque;
A predetermined charging-side power width that is a power width to the charging side of the secondary battery and a power to the discharging side of the secondary battery with respect to the target output of the generator corresponding to the set generator target torque A generator control output setting means for setting the generator control output so that the generator control output that has been set so far is held as much as possible within a wide range of a predetermined discharge-side power width as a width. When,
A motor output allowable range setting means for setting an output allowable range in which the output of the electric motor is allowed based on a difference between the set input / output limit and the set output for controlling the generator;
Motor control torque setting means for setting the motor control torque by limiting the set motor target torque using the set output allowable range of the motor;
The internal combustion engine is operated at the set target operating point, the set generator target torque is output from the generator, and the set motor control torque is output from the motor. A control means for controlling the engine, the generator and the electric motor,
When the temperature of the secondary battery is equal to or higher than a second predetermined temperature that is equal to or lower than the first predetermined temperature, the generator control output setting means is configured to output the predetermined charging side power width and the predetermined discharging side power width. Are set as predetermined power, and the output for controlling the generator is set. When the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charging side power width is set as the predetermined power and the predetermined power is set. Is a means for setting the output for control of the generator with a discharge side power width of less than the predetermined power,
Power output device. The power output device according to claim 1,
The generator control output setting means sets the predetermined discharge-side power width to 0 when the temperature of the secondary battery is equal to or lower than a third predetermined temperature that is lower than the second predetermined temperature. A means for setting a control output;
Power output device. The power output device according to claim 1 or 2,
The generator control output setting means is configured such that when the temperature of the secondary battery is lower than the second predetermined temperature, the temperature of the secondary battery becomes lower than the second predetermined temperature as the predetermined discharge-side power width. It is means for setting the output for control of the generator using electric power smaller than a predetermined electric power,
Power output device.   A vehicle comprising the power output device according to any one of claims 1 to 3 and an axle connected to the drive shaft. An internal combustion engine, a generator capable of inputting / outputting power, a drive shaft, an output shaft of the internal combustion engine, and a rotating shaft of the generator are connected to three shafts and input / output to any two of the three shafts A three-shaft power input / output means for inputting / outputting power to / from the remaining shaft based on the generated power, an electric motor capable of inputting / outputting power to / from the drive shaft, and exchange of electric power with the generator and the motor. A secondary battery having charge / discharge characteristics in which the maximum power that can be charged is smaller than the maximum power that can be discharged at a temperature lower than the first predetermined temperature;
(A) A target operating point consisting of a target rotational speed and a target torque for operating the internal combustion engine is set based on a required torque required for the drive shaft, and a target rotation at the set target operating point of the internal combustion engine is set. Set the generator target torque to be output from the generator so that the internal combustion engine is operated in number,
(B) a predetermined charging side power width that is a power width to the charging side of the secondary battery with respect to the target output of the generator corresponding to the set generator target torque and the discharging side of the secondary battery Set the generator control output so that the generator control output that has been set so far within a wide range by a predetermined discharge side power width that is the power width to
(C) By the difference between the input / output restriction as the maximum allowable power when charging / discharging the secondary battery set based on the charge / discharge characteristics of the secondary battery and the set output for controlling the generator Set an output allowable range in which the output of the electric motor is allowed,
(D) Based on the set generator target torque and the required torque, the set electric motor target motor target torque to be output from the electric motor set to output the required torque to the drive shaft Set the control torque of the electric motor to be limited using the output allowable range of
(E) The internal combustion engine is operated at the set target operating point, the set generator target torque is output from the generator, and the set motor control torque is output from the motor. Controlling the internal combustion engine, the generator and the electric motor,
A method for controlling a power output device,
In the step (b), when the temperature of the secondary battery is equal to or higher than a second predetermined temperature that is equal to or lower than the first predetermined temperature, the predetermined charging-side power width and the predetermined discharging-side power width are set. In any case, the control output of the generator is set as predetermined power, and when the temperature of the secondary battery is lower than the second predetermined temperature, the predetermined charging side power width is set as the predetermined power and the predetermined discharge is performed. Setting the output for control of the generator with a side power width smaller than the predetermined power,
A control method for a power output apparatus.

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