JP2007237821A - Power output device, vehicle mounted thereon, and control method for power output device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the excessive decrease or increase in voltage of a capacitor 57 even when a battery 50 is shut off from a power bus line 54 of inverters 41, 42, 90. <P>SOLUTION: When a battery 50 is shut off from the bus line 54 of the inverters 41, 42, 90, if the voltage of the capacitor 57 becomes lower than a lower limit voltage, a power output device stops a compressor 92 for an airconditioner, and if the voltage of the capacitor 57 becomes higher than an upper limit voltage, the device forcibly drives the compressor 92. Thereby, the device may suppress the excessive decrease or increase in voltage of the capacitor 57. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power output apparatus, a vehicle equipped with the power output apparatus, and a method for controlling the power output apparatus.

Conventionally, as this kind of power output measure, a first motor and a drive shaft are connected to a planetary gear connected to an engine crankshaft and a second motor is connected to the drive shaft, and an inverter for the first motor and the second motor. A battery that is connected to a battery via a relay and mounted on a hybrid vehicle has been proposed (for example, see Patent Document 1). In this device, when an abnormality occurs in the battery, the relay is turned off to disconnect the battery from the inverter, the engine is operated at the target rotational speed based on the driver's request, and the electric power generated by the first motor is generated by the second motor. It is said that the power can be output to the drive shaft in a state where the power generation amount and the power consumption amount are balanced and the battery is shut off.
JP 2001-329884 A

  By the way, in such a power output apparatus, an inverter that drives equipment such as an air conditioner compressor may be connected to the inverters of the first motor and the second motor in common with the power bus. In such a device, when the relay is turned off and the battery is cut off from the inverter, for example, the first motor and the second motor are not connected to the first motor due to a difference between the command value and the output torque due to a response delay of the first motor or the second motor, If the power balance with the second motor is lost, the voltage of the power bus may be lowered too much to drive the first motor or the second motor, or the voltage of the power bus may be overvoltage.

  The power output apparatus of the present invention, a vehicle equipped with the power output apparatus, and a control method for the power output apparatus are provided by storing power from a first drive circuit that drives a power generation means that shares a power bus, a second drive circuit that drives an electric motor, and a device. One of the purposes is to suppress the voltage of the power bus from being excessively lowered when the device is shut off. Further, the power output apparatus of the present invention, the vehicle equipped with the power output apparatus, and the control method of the power output apparatus include a first drive circuit for driving a power generation means having a common power bus, a second drive circuit for driving an electric motor, and a device. One of the objects is to suppress the voltage of the power bus from becoming an overvoltage when the power storage device is cut off from the power source.

  The power output apparatus of the present invention, a vehicle equipped with the power output apparatus, and a method for controlling the power output apparatus employ the following means in order to achieve at least a part of the above object.

The first power output device of the present invention comprises:
A power output device that outputs power to a drive shaft,
Power generation means capable of generating electricity by receiving fuel supply;
A first drive circuit for driving the power generation means;
An electric motor capable of inputting and outputting power to the drive shaft;
A second drive circuit for driving the electric motor in common with the first drive circuit and a power bus;
A device that operates using electric power in common with the first drive circuit and a power bus;
Charge / discharge power storage means;
A cutoff connection means for connecting the power storage means to a power bus of the first drive circuit, the second drive circuit, and the device in such a manner that the storage means can be cut off;
A bus voltage detecting means for detecting a bus voltage which is a voltage of the power bus;
When the power storage means is shut off from the first drive circuit, the second drive circuit, and the device by the shut-off connection means, the detected bus voltage approaches the target voltage and power based on the driver's request is generated. Controlling the power generation means and the electric motor to be output to the drive shaft, and executing a shut-off control for controlling the device to operate based on an operation request, and executing the shut-off control. Control means for controlling the device so that driving of the device is restricted when the detected bus voltage is lower than a lower limit voltage lower than the target voltage during
It is a summary to provide.

  In the first power output apparatus of the present invention, the first connecting circuit for driving the power generation means, the second driving circuit for driving the electric motor, and the disconnecting connecting means for connecting the power storage means to the power bus bar of the device in a manner that enables disconnection. When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device, power generation is performed so that the bus voltage, which is the voltage of the power bus, approaches the target voltage and power based on the driver's request is output to the drive shaft. The control at the time of controlling the device and the motor and controlling the device so that the device operates based on the operation request is executed. During the control at the time of shutting down, the bus voltage is lower than the lower limit voltage below the target voltage. When it becomes low, the device is controlled so that the drive of the device is limited. Therefore, when the power balance between the power generation means and the motor is lost during the shut-off control and the bus voltage becomes lower than the lower limit voltage, the power consumption of the equipment is higher than that which does not restrict the driving of the equipment. Can be suppressed, and the bus voltage can be prevented from excessively decreasing. Since the magnitude of the driving force that can be output from the generator or motor becomes smaller as the bus voltage is lower, the generator or motor can be driven appropriately by suppressing the bus voltage from being excessively lowered. Here, the “lower limit voltage” may be set to a voltage higher than the lower limit voltage that can be output as the lower limit of the bus voltage that can output the driving force from the generator or the motor.

  In the first power output apparatus of the present invention, when the detected bus voltage becomes higher than the upper limit voltage higher than the target voltage during the execution of the shut-off control, the control means, It may be a means for controlling the device so that the stoppage of the device is restricted. In this way, it is possible to suppress the bus voltage from becoming an overvoltage.

The second power output device of the present invention is:
A power output device that outputs power to a drive shaft,
Power generation means capable of generating electricity by receiving fuel supply;
A first drive circuit for driving the power generation means;
An electric motor capable of inputting and outputting power to the drive shaft;
A second drive circuit for driving the electric motor in common with the first drive circuit and a power bus;
A device that operates using electric power in common with the first drive circuit and a power bus;
Charge / discharge power storage means;
A cutoff connection means for connecting the power storage means to a power bus of the first drive circuit, the second drive circuit, and the device in such a manner that the storage means can be cut off;
A bus voltage detecting means for detecting a bus voltage which is a voltage of the power bus;
When the power storage means is shut off from the first drive circuit, the second drive circuit, and the device by the shut-off connection means, the detected bus voltage approaches the target voltage and power based on the driver's request is generated. Controlling the power generation means and the electric motor to be output to the drive shaft, and executing a shut-off control for controlling the device to operate based on an operation request, and executing the shut-off control. Control means for controlling the device so that the stop of the device is restricted when the detected bus voltage is higher than the upper limit voltage higher than the target voltage during
It is a summary to provide.

  In the second power output device of the present invention, the first drive circuit for driving the power generation means, the second drive circuit for driving the electric motor, and the disconnection connection means for connecting the power storage means to the power bus line of the device in such a manner that the storage means can be disconnected. When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device, power generation is performed so that the bus voltage, which is the voltage of the power bus, approaches the target voltage and power based on the driver's request is output to the drive shaft. The control at the time of controlling the device and the motor and controlling the device so that the device operates based on the operation request is executed. During the control at the time of shutting down, the bus voltage is higher than the upper limit voltage higher than the target voltage. When it becomes higher, the device is controlled so that the stoppage of the device is restricted. Therefore, when the power balance between the power generation means and the motor breaks down during the shut-off control and the bus voltage becomes higher than the upper limit voltage, the power is supplied by the equipment compared to the one that does not limit the stoppage of the equipment. It can be consumed, and the bus voltage can be suppressed from becoming an overvoltage.

  In the first or second power output device of the present invention in which the stoppage of the device is restricted when the bus voltage becomes higher than the upper limit voltage during execution of the shut-off control, it is attached between the power buses. The control means may be means for controlling a voltage lower than the predetermined withstand voltage as the upper limit voltage. In this way, it is possible to suppress the breakage of the capacitor.

  In the first or second power output apparatus of the present invention, the power generation means is connected to the internal combustion engine, an output shaft of the internal combustion engine, and the drive shaft, from the internal combustion engine with input and output of electric power and power. Power motive power input / output means for outputting at least part of the power to the drive shaft, and the first drive circuit may be a circuit for driving the power motive power input / output means. . In this case, the electric power drive input / output means is connected to the three shafts of the output shaft, the drive shaft and the third shaft of the internal combustion engine, and is based on the power input / output to / from any two of the three shafts. It is also possible to provide means that includes three-axis power input / output means for inputting / outputting power to / from the remaining shaft and a generator capable of inputting / outputting power to / from the third shaft.

  In the first or second power output apparatus of the present invention, the device may be an air conditioning device that performs air conditioning in the passenger compartment. In this case, by controlling the air conditioner according to the bus voltage, it is possible to suppress the bus voltage from being excessively lowered or overvoltage.

  The vehicle of the present invention is the first or second power output device of the present invention according to any one of the above-described aspects, that is, basically a power output device that outputs power to the drive shaft, and supplies fuel. Power generation means capable of generating electric power, a first drive circuit for driving the power generation means, an electric motor capable of inputting / outputting power to / from the drive shaft, and the electric motor with the first drive circuit and a power bus in common. A second driving circuit for driving, a device that operates using electric power in common with the first driving circuit and the power bus, chargeable / dischargeable power storage means, the first driving circuit, the second driving circuit, and the A disconnecting connection means for connecting the power storage means to a power bus with the device so as to be able to be disconnected; a bus voltage detecting means for detecting a bus voltage which is a voltage of the power bus; and From the second drive circuit and the device, the storage When the means is shut off, the power generating means and the electric motor are controlled so that the detected bus voltage approaches the target voltage and power based on the driver's request is output to the drive shaft, and based on the operation request. Control when the device is operated so that the device is operated, and when the detected bus voltage is lower than the lower limit voltage lower than the target voltage during the control when the device is shut down. A power output device comprising a control means for controlling the device so that driving of the device is restricted, or a power output device for outputting power to the drive shaft, wherein the power generation means is capable of generating electric power upon supply of fuel. A first drive circuit that drives the power generation means, an electric motor that can input and output power to the drive shaft, a second drive circuit that drives the electric motor in common with the first drive circuit and a power bus, The device that operates using electric power in common with the first drive circuit and the power bus, the storage means that can be charged and discharged, and the power storage in the power bus of the first drive circuit, the second drive circuit, and the device A disconnection connection means for connecting the means so as to be disconnected; a bus voltage detection means for detecting a bus voltage which is a voltage of the power bus; and the first drive circuit, the second drive circuit, and the device by the disconnection connection means, When the power storage means is turned off, the power generation means and the electric motor are controlled and operated so that the detected bus voltage approaches the target voltage and power based on the driver's request is output to the drive shaft. A control at the time of shutting down is performed to control the device so that the device is operated based on a request, and the bus voltage detected during the control at the time of shutting down is higher than an upper limit voltage higher than the target voltage. The gist of the invention is that a power output device including a control means for controlling the device so as to restrict the stop of the device when it becomes high is mounted, and an axle is connected to the drive shaft.

  In this vehicle of the present invention, since the first or second power output device of the present invention according to any one of the above-described aspects is mounted, the effect exerted by the power output device of the present invention, for example, the bus voltage is excessively lowered. It is possible to achieve the same effects as the effect that can suppress the occurrence of an overvoltage or the effect that the bus voltage can be suppressed from becoming an overvoltage.

  In such a vehicle of the present invention, the device includes a second electric motor capable of inputting / outputting power to / from an axle connected to the drive shaft or an axle different from the axle, and a third drive circuit for driving the second motor. It can also be a thing provided with. In this case, by controlling the second electric motor in accordance with the bus voltage, it is possible to suppress the bus voltage from being excessively lowered or overvoltage.

The control method of the first power output device of the present invention is:
A power generation means capable of generating power upon receipt of fuel, a first drive circuit for driving the power generation means, an electric motor capable of inputting / outputting power to / from a drive shaft, and the first drive circuit and the power bus in common A second drive circuit for driving an electric motor; a device that operates using electric power in common with the first drive circuit; and a power storage means that can be charged and discharged; the first drive circuit and the second drive circuit; And a connection means for connecting the power storage means to the power bus of the device so as to be able to be cut off, and a control method of a power output device comprising:
When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage that is the voltage of the power bus approaches the target voltage and meets the driver's request. Controlling the power generation means and the electric motor so that the motive power based on the power is output to the drive shaft, and executing the shut-off control for controlling the equipment so that the equipment is operated based on the operation request. The gist is to control the device so that the driving of the device is limited when the bus voltage becomes lower than the lower limit voltage lower than the target voltage during the execution.

  According to the control method of the first power output device of the present invention, the power storage means is connected to the power bus of the first drive circuit for driving the power generation means, the second drive circuit for driving the electric motor, and the device so as to be cut off. When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage, which is the voltage of the power bus, approaches the target voltage and power based on the driver's request is applied to the drive shaft. The power generation means and the motor are controlled so that they are output, and the control at the time of shutting down is performed to control the equipment based on the operation request, and the bus voltage is set to the target voltage during the control at the time of shutting down. When the voltage becomes lower than the lower limit voltage, the device is controlled so that the driving of the device is limited. Therefore, when the power balance between the power generation means and the motor is lost during the shut-off control and the bus voltage becomes lower than the lower limit voltage, the power consumption of the equipment is higher than that which does not restrict the driving of the equipment. Can be suppressed, and the bus voltage can be prevented from excessively decreasing. Since the magnitude of the driving force that can be output from the generator or motor becomes smaller as the bus voltage is lower, the generator or motor can be driven appropriately by suppressing the bus voltage from being excessively lowered.

The control method of the second power output device of the present invention is:
A power generation means capable of generating power upon receipt of fuel, a first drive circuit for driving the power generation means, an electric motor capable of inputting / outputting power to / from a drive shaft, and the first drive circuit and the power bus in common A second drive circuit for driving an electric motor; a device that operates using electric power in common with the first drive circuit; and a power storage means that can be charged and discharged; the first drive circuit and the second drive circuit; And a connection means for connecting the power storage means to the power bus of the device so as to be able to be cut off, and a control method of a power output device comprising:
When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage that is the voltage of the power bus approaches the target voltage and meets the driver's request. Controlling the power generation means and the electric motor so that the motive power based on the power is output to the drive shaft, and executing the shut-off control for controlling the equipment so that the equipment is operated based on the operation request. The gist is to control the device so that the stop of the device is restricted when the bus voltage becomes higher than the upper limit voltage higher than the target voltage during execution.

  According to the control method for the second power output apparatus of the present invention, the power storage means is connected to the power bus of the first drive circuit for driving the power generation means, the second drive circuit for driving the electric motor, and the device so as to be cut off. When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage, which is the voltage of the power bus, approaches the target voltage and power based on the driver's request is applied to the drive shaft. The power generation means and the motor are controlled so that they are output, and the control at the time of shutting down is performed to control the equipment based on the operation request, and the bus voltage is set to the target voltage during the control at the time of shutting down. When the voltage exceeds a higher upper limit voltage, the device is controlled so that the stop of the device is restricted. Therefore, when the power balance between the power generation means and the motor breaks down during the shut-off control and the bus voltage becomes higher than the upper limit voltage, the power is supplied by the equipment compared to the one that does not limit the stoppage of the equipment. It can be consumed, and the bus voltage can be suppressed from becoming an overvoltage.

  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 motor MG2 connected to a ring gear shaft 32a as a drive shaft connected to the power distribution and integration mechanism 30 via a reduction gear 35, and a direct current from the battery 50 Controls inverters 41 and 42 that can be converted into alternating current and supplied to motors MG1 and MG2, a system main relay 56 interposed between power line 54 and battery 50 of inverters 41 and 42, and the entire power output device. A hybrid electronic control unit 70.

  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. 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. A smoothing capacitor 57 is connected to the power line 54. 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.

  An air conditioner compressor 92 in an air conditioner that performs air conditioning in the passenger compartment is connected to the power line 54 via an inverter 90 so that power from the battery 50 can be supplied to the air conditioner compressor 92.

  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 a capacitor voltage Vc from a voltage sensor 58 mounted between terminals of a capacitor 57, an ignition signal from an ignition switch 80, and a shift position sensor 82 that detects an operation position of the shift lever 81. From the shift position SP, the accelerator opening Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83, the brake pedal position BP from the brake pedal position sensor 86 that detects the depression amount of the brake pedal 85, and the vehicle speed sensor 88 Vehicle speed V and the like are input through the input port. From the hybrid electronic control unit 70, a drive signal to the system main relay 56, a switching control signal to the switching element of the inverter 90 that drives the air conditioner compressor 92, and the like are output via an output 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 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 system main relay 56 is turned off and the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, 90 due to the operation of the hybrid vehicle 20 of the embodiment thus configured, in particular, an abnormality in the battery 50. The operation when traveling in a state will be described. FIG. 2 is a flowchart illustrating an example of a battery shut-off 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 battery cut-off 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 Ne of the engine 22, A process of inputting data necessary for control such as the rotational speeds Nm1, Nm2 of the motors MG1, MG2 and the capacitor voltage Vc from the voltage sensor 58 is executed (step S100). Here, the rotation speed Ne of the engine 22 is calculated based on a signal from a crank position sensor (not shown) attached to the crankshaft 26 and is input from the engine ECU 24 by communication. Further, 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. It was supposed to be.

  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. 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. 3 shows an example of the required torque setting map.

  Subsequently, the target voltage Vc * of the capacitor 57 is set (step S120). Since the target voltage Vc * is determined by the capacitor voltage Vc in the region of torque that can be output from the motors MG1 and MG2, in the embodiment, the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, and 90. In this case, a voltage is set in which the torque of the motors MG1 and MG2 necessary for this is determined in consideration of the region. For reference, an example of the relationship between the capacitor voltage Vc, the rotation speed Nm1 of the motor MG1, and the torque Tm1 is shown in FIG. 4, and an example of the relationship between the capacitor voltage Vc, the rotation speed Nm2 of the motor MG2, and the torque Tm2 is shown in FIG. FIG. 6 shows an example of the relationship between the rotation speed Nm1 of the motor MG1 and the output possible lower limit voltage Vcmin as the lower limit of the capacitor voltage Vc that can output torque from the motor MG1. As shown in FIGS. 4 and 5, the torque region that can be output from the motor MG <b> 1 and the torque region that can be output from the motor MG <b> 2 are set so as to decrease as the capacitor voltage Vc decreases. In the example of FIG. 6, it is determined that the output possible lower limit voltage Vcmin tends to increase as the rotational speed Nm1 of the motor MG1 increases. The target voltage Vc * is set as a voltage higher than the output possible lower limit voltage Vcmin and a voltage lower than the withstand voltage of the capacitor 57.

  Then, the target rotational speed Ne * of the engine 22 is set (step S130), and the target torque Te to be output from the engine 22 by the following equation (1) based on the set target rotational speed Ne * and the current rotational speed Ne. * Is set (step S140). Here, the target rotational speed Ne * is set to, for example, 1800 rpm or 2000 rpm in consideration of the voltage to be applied to the capacitor 57 when traveling with the battery 50 disconnected from the power bus 54 of the inverters 41, 42, 90. Can be set. Expression (1) is a relational expression in feedback control for rotating the engine 22 at the target rotational speed Ne *. In the expression (1), “k1” in the second term on the right side is a gain of the proportional term. “K2” in the third term on the right side is the gain of the integral term.

  Te * = k1 (Ne * -Ne) + k2∫ (Ne * -Ne) dt (1)

  Next, based on the capacitor voltage Vc and the target voltage Vc *, the target power W * to be inputted to and outputted from the capacitor 57 is set by the following equation (2) (step S150), and equations (3) and (4) Are used to set temporary motor torques Tm1tmp and Tm2tmp to be output from the motors MG1 and MG2 (step S160). Here, Expression (2) is a relational expression in feedback control for making the capacitor voltage Vc coincide with the target voltage Vc *. In Expression (2), “k3” indicates the gain of the proportional term, and “k4” Indicates the gain of the integral term. Expression (3) is a relationship in which the sum of torques output from the motor MG1 and the motor MG2 to the ring gear shaft 32a serving as a drive shaft is the required torque Tr *, and Expression (4) is a relationship between the motor MG1 and the motor MG2. Therefore, the sum of the power inputted to and outputted from the capacitor 57 becomes the target power W *. FIG. 7 shows how the temporary motor torques Tm1tmp and Tm2tmp of the motors MG1 and MG2 are set. As illustrated, the temporary motor torques Tm1tmp and Tm2tmp can be obtained as torques (T1 and T2 in the figure) at the intersections between a line satisfying the relationship of Expression (3) and a line satisfying the relationship of Expression (4). . FIG. 8 is 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 when traveling with the battery 50 disconnected from the power bus 54 of the inverters 41, 42, and 90. Show. 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. 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 (3) can be easily derived by using this alignment chart.

W * = k3 (Vc-Vc *) + k4∫ (Vc-Vc *) dt (2)
−Tm1tmp / ρ + Tm2tmp ・ Gr = Tr * (3)
Tm1tmp ・ Nm1 + Tm2tmp ・ Nm2 = W * (4)

  Then, based on the rotational speed Nm1 of the motor MG1 and the capacitor voltage Vc, torque limits Tm1min and Tm1max as upper and lower limits of the torque that may be output from the motor MG1 are set using the map of FIG. S170), a torque limit Tm2max as an upper limit of the torque that may be output from the motor MG2 based on the rotation speed Nm2 of the motor MG2 and the capacitor voltage Vc is set using the map shown in FIG. 5 (step S180). The temporary motor torque Tm1tmp is limited by the torque limits Tm1min and Tm1max to set the torque command Tm1 * of the motor MG1 (step S190), and the temporary motor torque Tm2tmp is limited by the torque limit Tm2max and the motor MG2 torque command Tm2 * is set. Set (step S20 ). Thus, by setting the torque commands Tm1 * and Tm2 * of the motors MG1 and MG2, the required torque Tr * is set within the torque limit range based on the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 and the capacitor voltage Vc. Accordingly, motors MG1 and MG2 are each driven.

  Thus, when the target engine speed Ne *, the target torque Te *, and the torque commands Tm1 *, Tm2 * of the motors MG1, MG2 are set, the target engine speed Ne * and the target torque Te * of the engine 22 are set in the engine ECU 24. Torque commands Tm1 * and Tm2 * for motors MG1 and MG2 are transmitted to motor ECU 40, respectively (step S210). 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.

  Next, the capacitor voltage Vc is compared with the threshold value Vref1 and the threshold value Vref2 (steps S220 and S230). When the capacitor voltage Vc is equal to or higher than the threshold value Vref1 and equal to or lower than the threshold value Vref2, the compressor 92 for the air conditioner in the air conditioner is used. Is controlled intermittently (step S240), and when the capacitor voltage Vc is less than the threshold value Vref1, the inverter 90 is controlled so that the air conditioner compressor 92 is stopped (step S250), and the capacitor voltage Vc is set to the threshold value Vref2. When it is higher, the inverter 90 is controlled so that the air conditioner compressor 92 is driven (step S260), and the battery shut-off control routine is ended. Here, the threshold value Vref1 is set as a voltage that is slightly higher than the above-described output possible lower limit voltage Vcmin and lower than the target voltage Vc *, and is set according to the rating of the motor MG1 or the specifications of the vehicle. The threshold value Vref2 is set as a voltage higher than the target voltage Vc * and a voltage lower than the withstand voltage of the capacitor 57. Now, consider the case where the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, 90. At this time, the engine 22 and the two motors MG1 and MG2 are controlled so that the capacitor voltage Vc approaches the target voltage Vc * and power based on the required torque Tr * is output to the ring gear shaft 32a serving as a drive shaft. The air conditioner compressor 92 in the air conditioner is intermittently driven based on the temperature of the air. In this state, when the driver depresses the accelerator pedal 83 greatly and the required torque Tr * changes suddenly, such as when the driving state of the motors MG1 and MG2 changes abruptly, the torque command and the output torque are delayed due to a response delay of the motors MG1 and MG2. There is a gap between the motors MG1 and MG2 and the capacitor voltage Vc may be lower than the threshold value Vref1 or higher than the threshold value Vref2. In the embodiment, since the air conditioner compressor 92 is stopped when the capacitor voltage Vc becomes lower than the threshold value Vref1, power consumption by the air conditioner compressor 92 can be suppressed as compared with the case where the air conditioner compressor 92 is not stopped. Therefore, it is possible to suppress the capacitor voltage Vc * from being excessively lowered. As a result, even when the battery 50 is shut off, the motors MG1 and MG2 can be driven appropriately. Further, when the capacitor voltage Vc becomes higher than the threshold value Vref2, the air conditioner compressor 92 is forcibly driven, that is, does not stop, so that the air conditioner compressor 92 consumes electric power compared to the case where the air conditioner compressor 92 is stopped. It is possible to suppress the capacitor voltage Vc from becoming an overvoltage. As a result, damage to the capacitor 57 can be suppressed.

  According to the hybrid vehicle 20 of the embodiment described above, the air conditioner compressor 92 is stopped when the capacitor voltage Vc becomes lower than the threshold value Vref1 while the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, and 90. Therefore, it is possible to appropriately drive the motors MG1 and MG2 while suppressing the capacitor voltage Vc from excessively decreasing. Further, when the capacitor voltage Vc becomes higher than the threshold value Vref2 higher than the threshold value Vref1 in a state where the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, 90, the air conditioner compressor 92 is forcibly driven. The voltage Vc can be prevented from becoming an overvoltage, and the capacitor 57 can be protected. Of course, even when the battery 50 is disconnected from the power bus 54 of the inverters 41, 42, 90, power based on the required torque Tr * can be output to the ring gear shaft 32a as the drive shaft.

  In the hybrid vehicle 20 of the embodiment, when the battery 50 is cut off and the capacitor voltage Vc is not less than the threshold value Vref1 and not more than the threshold value Vref2, the air conditioner compressor 92 is intermittently driven according to the temperature in the passenger compartment, and the capacitor voltage Vc. When the air conditioner becomes higher than the threshold value Vref2, the air conditioner compressor 92 is forcibly driven. However, if the power consumption can be set in a plurality of stages when the air conditioner compressor 92 is driven, a capacitor is used. When the voltage Vc becomes higher than the threshold value Vref2, the air conditioner compressor 92 may be driven so that the power consumption becomes larger than when the capacitor voltage Vc is equal to or higher than the threshold value Vref1 and equal to or lower than the threshold value Vref2. By so doing, it is possible to further suppress the capacitor voltage Vc from becoming an overvoltage.

  In the hybrid vehicle 20 of the embodiment, the power of the motor MG2 is shifted by the reduction gear 35 and output to the ring gear shaft 32a. However, as illustrated in the hybrid vehicle 120 of the modified example of FIG. May be connected to an axle (an axle connected to the wheels 64a and 64b in FIG. 9) 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 the hybrid vehicle 20 of the embodiment, the power of the engine 22 is output to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b via the power distribution and integration mechanism 30, but the modified example of FIG. The hybrid vehicle 220 includes an inner rotor 232 connected to the crankshaft 26 of the engine 22 and an outer rotor 234 connected to a drive shaft that outputs power to the drive wheels 63a and 63b. A counter-rotor motor 230 that transmits a part of the power to the drive shaft and converts the remaining power into electric power may be provided.

  In the hybrid vehicle 20 of the embodiment, when the capacitor voltage Vc becomes higher than the threshold value Vref2 in a state where the battery 50 is cut off, the air conditioner compressor 92 is driven to consume electric power. The power is not limited, and power may be consumed by other auxiliary machines (for example, lights connected to the power line 54 via a DC / DC converter capable of stepping up and down the voltage). Further, as illustrated in the hybrid vehicle 320 of the modified example of FIG. 11, the engine 22 and the motor MG1 are connected to the power distribution and integration mechanism 30 connected to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b. The motor MG2 is connected to the ring gear shaft 32a, the motor MG3 is connected to wheels 64a, 64b different from the drive wheels 63a, 63b, and the battery 50 is connected to the inverter of the motors MG1, MG2, MG3 via the system main relay 56. When the capacitor voltage Vc becomes higher than the threshold value Vref2 in a state where the battery 50 is cut off, the motor MG3 is driven by the torque command Tm3 * having a value of 0 instead of the air conditioner compressor 92. Even if the MG3 inverter is controlled to consume power There. Even in this case, it is possible to suppress the capacitor voltage Vc from becoming an overvoltage as in the embodiment. In this case, the motor MG3 may be connected to the drive wheels 63a and 63b. Further, in the configuration including both the air conditioner inverter 92 and the motor MG3, when the battery 50 is cut off and the capacitor voltage Vc is higher than the threshold value Vref2, power is generated by at least one of the air conditioner inverter 92 and the motor MG3. May be used.

  In the embodiment, a so-called parallel hybrid vehicle that can travel using the power from the engine and the power from the motor has been described, but the engine, the generator that can generate power using the power from the engine, and the drive shaft The present invention may be applied to a so-called series type hybrid vehicle including an electric motor capable of outputting power and a battery connected to a generator and a motor inverter via a system main relay.

  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.

  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.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 equipped with a power output apparatus as an embodiment of the present invention. It is a flowchart which shows an example of the control routine at the time of the battery interruption | blocking performed by the hybrid electronic control unit 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 an example of the relationship between the capacitor voltage Vc, the rotation speed Nm1 of motor MG1, and torque Tm1. It is explanatory drawing which shows an example of the relationship between the capacitor voltage Vc, the rotation speed Nm2 of motor MG2, and torque Tm2. It is explanatory drawing which shows an example of the relationship between the rotation speed Nm1 of the motor MG1 and the output possible lower limit voltage Vcmin as the lower limit of the capacitor voltage Vc that can output torque from the motor MG1. It is explanatory drawing which shows a mode that the temporary motor torque Tm1tmp and Tm2tmp of motor MG1, MG2 are set. It is explanatory drawing which shows an example of the alignment chart for demonstrating the power distribution integration mechanism 30 dynamically. 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. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 320 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 56 System main relay 57 Capacitor 58 Voltage sensor 60 Gear mechanism 62 Differential gear 63a 63b Drive wheel 64a 64b Wheel 70 Hybrid electronic control unit 72 CPU 74 RO 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, 90 Inverter, 92 Air conditioner compressor, 230 Anti-rotor motor, 232 inner rotor 234 outer rotor, MG1, MG2 motor.

Claims (11)

A power output device that outputs power to a drive shaft,
Power generation means capable of generating electricity by receiving fuel supply;
A first drive circuit for driving the power generation means;
An electric motor capable of inputting and outputting power to the drive shaft;
A second drive circuit for driving the electric motor in common with the first drive circuit and a power bus;
A device that operates using electric power in common with the first drive circuit and a power bus;
Charge / discharge power storage means;
A cutoff connection means for connecting the power storage means to a power bus of the first drive circuit, the second drive circuit, and the device in such a manner that the storage means can be cut off;
A bus voltage detecting means for detecting a bus voltage which is a voltage of the power bus;
When the power storage means is shut off from the first drive circuit, the second drive circuit, and the device by the shut-off connection means, the detected bus voltage approaches the target voltage and power based on the driver's request is generated. Controlling the power generation means and the electric motor to be output to the drive shaft, and executing a shut-off control for controlling the device to operate based on an operation request, and executing the shut-off control. Control means for controlling the device so that driving of the device is restricted when the detected bus voltage is lower than a lower limit voltage lower than the target voltage during
A power output device comprising:   The control means controls the device so that the stop of the device is restricted when the detected bus voltage becomes higher than an upper limit voltage higher than the target voltage during the execution of the shut-off control. The power output apparatus according to claim 1, wherein A power output device that outputs power to a drive shaft,
Power generation means capable of generating electricity by receiving fuel supply;
A first drive circuit for driving the power generation means;
An electric motor capable of inputting and outputting power to the drive shaft;
A second drive circuit for driving the electric motor in common with the first drive circuit and a power bus;
A device that operates using electric power in common with the first drive circuit and a power bus;
Charge / discharge power storage means;
A cutoff connection means for connecting the power storage means to a power bus of the first drive circuit, the second drive circuit, and the device in such a manner that the storage means can be cut off;
A bus voltage detecting means for detecting a bus voltage which is a voltage of the power bus;
When the power storage means is shut off from the first drive circuit, the second drive circuit, and the device by the shut-off connection means, the detected bus voltage approaches the target voltage and power based on the driver's request is generated. Controlling the power generation means and the electric motor to be output to the drive shaft, and executing a shut-off control for controlling the device to operate based on an operation request, and executing the shut-off control. Control means for controlling the device so that the stop of the device is restricted when the detected bus voltage is higher than the upper limit voltage higher than the target voltage during
A power output device comprising: The power output device according to claim 2 or 3,
A capacitor having a predetermined withstand voltage attached between the power buses,
The control means is means for controlling a voltage lower than the predetermined withstand voltage as the upper limit voltage. The power output device according to any one of claims 1 to 4,
The power generation means is an electric power that is connected to an internal combustion engine, an output shaft of the internal combustion engine, and the drive shaft, and outputs at least part of the power from the internal combustion engine to the drive shaft with input and output of power and power. A power input / output means;
The first drive circuit is a circuit that drives the power power input / output means.   The power power input / output means is connected to the three shafts of the output shaft, the drive shaft, and the third shaft of the internal combustion engine, and is based on the power input / output to / from any two of the three shafts. 6. The power output apparatus according to claim 5, wherein the power output device comprises three-axis power input / output means for inputting / outputting power to / from the shaft and a generator capable of inputting / outputting power to / from the third shaft.   The power output apparatus according to any one of claims 1 to 6, wherein the device is an air conditioning device that performs air conditioning in a passenger compartment.   A vehicle on which the power output device according to claim 1 is mounted and an axle is connected to the drive shaft.   The device includes a second electric motor capable of inputting / outputting power to / from an axle connected to the drive shaft or an axle different from the axle, and a third drive circuit for driving the second motor. The vehicle according to claim 7 according to any one of 1 to 5. A power generation means capable of generating power upon receipt of fuel, a first drive circuit for driving the power generation means, an electric motor capable of inputting / outputting power to / from a drive shaft, and the first drive circuit and the power bus in common A second drive circuit for driving an electric motor; a device that operates using electric power in common with the first drive circuit; and a power storage means that can be charged and discharged; the first drive circuit and the second drive circuit; And a connection means for connecting the power storage means to the power bus of the device so as to be able to be cut off, and a control method of a power output device comprising:
When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage that is the voltage of the power bus approaches the target voltage and meets the driver's request. Controlling the power generation means and the electric motor so that the motive power based on the power is output to the drive shaft, and executing the shut-off control for controlling the equipment so that the equipment is operated based on the operation request. A control method for a power output apparatus, wherein the device is controlled such that driving of the device is restricted when the bus voltage becomes lower than a lower limit voltage lower than the target voltage during execution. A power generation means capable of generating power upon receipt of fuel, a first drive circuit for driving the power generation means, an electric motor capable of inputting / outputting power to / from a drive shaft, and the first drive circuit and the power bus in common A second drive circuit for driving an electric motor; a device that operates using electric power in common with the first drive circuit; and a power storage means that can be charged and discharged; the first drive circuit and the second drive circuit; And a connection means for connecting the power storage means to the power bus of the device so as to be able to be cut off, and a control method of a power output device comprising:
When the power storage means is cut off from the first drive circuit, the second drive circuit, and the device by the cut-off connection means, the bus voltage that is the voltage of the power bus approaches the target voltage and meets the driver's request. Controlling the power generation means and the electric motor so that the motive power based on the power is output to the drive shaft, and executing the shut-off control for controlling the equipment so that the equipment is operated based on the operation request. A control method for a power output apparatus, wherein the device is controlled such that stoppage of the device is restricted when the bus voltage becomes higher than an upper limit voltage higher than the target voltage during execution.

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