JP2010016954A - Drive system, vehicle, and charging method for electricity storing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To charge an electricity storing unit even if abnormality occurs in one phase of an electric motor. <P>SOLUTION: At the time of connecting an external power supply-side connector 92 and a vehicle-side connector 80 and charging a battery 50, an intra-AC port relay 84 is turned on and it is determined whether respective phases of motors MG1 and MG2 are normal or not. A system main relay 56 is turned on after determination. The transistor corresponding to the abnormal phase of the motors MG1 and MG2 holds an off state in the transistors T11 to T16 and T21 to T26 of inverters 41 and 42. Only the transistor corresponding to the normal phase of the motors MG1 and MG2 is on/off-controlled. Even if abnormality occurs in one phase of the motors MG1 and MG2, current is made to flow to the normal phase of the motors MG1 and MG2 and the battery 50 can be charged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drive device, a vehicle, and a method for charging a power storage device.

Conventionally, this type of drive device includes a motor, an inverter that drives the motor, and a battery that exchanges power with the motor via the inverter, and when the commercial power source is connected to the neutral point of the motor. Some have been proposed for charging a battery using power from a commercial power source (see, for example, Patent Document 1). In this device, when the integrated value of the deviation between the detected value of the motor phase current detected by the current sensor and the command value becomes larger than the allowable value, disconnection or power failure in the commercial power supply, disconnection of the motor winding, It is determined that an abnormality such as breakage of the current sensor has occurred, and the generation of the drive signal for the inverter transistor is stopped by turning on the shutdown signal.
JP 2000-270484 A

  In the above drive device, when the integrated value of the deviation between the detected value of the motor phase current and the command value becomes larger than the allowable value, the shutdown signal is turned on to stop the generation of the drive signal of the inverter transistor. However, in such a drive device, when the commercial power source is connected to the neutral point of the motor, it may be desired that the power storage device can be charged even when an abnormality occurs in any phase of the motor.

  The main object of the driving device, the vehicle, and the method for charging the power storage device of the present invention is to enable charging of the power storage device even when an abnormality occurs in any phase of the electric motor.

  The drive device, the vehicle, and the charging method of the power storage device of the present invention employ the following means in order to achieve the main object described above.

The drive device of the present invention is
An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements, and an electric storage means that can exchange electric power with the electric motor via the inverter circuit A drive device comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source in a state where the neutral point of the motor is connected to an external power source that is a power source outside the driving device A charging time control means for controlling the inverter circuit so that the current storage means is charged by a current flowing in a normal phase excluding the abnormal phase when any phase of the electric motor is abnormal When,
It is a summary to provide.

  In the driving device of the present invention, when the power storage means is charged using the power from the external power source in a state where the neutral point of the motor is connected to the external power source that is a power source outside the driving device, each phase of the motor is If any of the phases of the motor is abnormal, the inverter circuit is controlled so that the current flows in the normal phase excluding the abnormal phase and the power storage means is charged. Thereby, even when abnormality occurs in any phase of the electric motor or the inverter circuit, the power storage means can be charged.

  In such a driving apparatus of the present invention, the charging control means is means for maintaining an off state for the switching elements corresponding to the abnormal phase of the electric motor among the plurality of switching elements of the inverter circuit. You can also.

  Further, in the driving device of the present invention, the charging control means is configured so that any one of the electric motors in a state where a switching element corresponding to a phase other than the arbitrary one phase of the electric motor among the plurality of switching elements of the inverter circuit is turned off. It may be a means for judging whether or not any one phase of the electric motor is normal based on the voltage on the power storage means side from the inverter circuit when switching of the switching element corresponding to the phase is performed. If it carries out like this, it can be determined whether it is normal about each phase of an electric motor.

  Furthermore, in the drive device of the present invention, the second electric motor that is rotationally driven by polyphase alternating current, the first inverter circuit and the power bus are shared, and there are a plurality of switching elements, and the switching of the plurality of switching elements is performed. A second inverter circuit that drives the second motor, and the power storage means can exchange power with the motor and the second motor via the inverter circuit and the second inverter circuit. And the charging control means determines whether or not each phase of the second electric motor is normal, and when any phase of the electric motor is abnormal, it is changed to a normal phase excluding the abnormal phase. It may be a means for controlling the second inverter circuit so that a current flows and the voltage of the power bus is adjusted. In this way, even when an abnormality occurs in any phase of the second electric motor, the voltage of the power bus can be adjusted.

  When the phase of any one of the second electric motors is abnormal, the present invention is configured to control the second inverter circuit so that a current flows in a normal phase excluding the abnormal phase and the voltage of the power bus is adjusted. In the driving apparatus, the charging control means is a means for maintaining an OFF state for a switching element corresponding to an abnormal phase of the second motor among the plurality of switching elements of the second inverter circuit. It can also be.

  In addition, when any phase of the second electric motor is abnormal, the second inverter circuit is controlled so that the current flows in the normal phase excluding the abnormal phase and the voltage of the power bus is adjusted. In the driving device according to the invention, the charging-time control means includes a half cycle of a phase of an input voltage input from the external power supply for a switching element corresponding to a normal phase of the electric motor among the plurality of switching elements of the inverter circuit. The inverter circuit is controlled so that the on / off state is switched at an interval corresponding to a half cycle, which is a time interval corresponding to, and switching corresponding to a normal phase of the second motor among a plurality of switching elements of the second inverter circuit Means for controlling the second inverter circuit so that the on / off state of the element is switched at a time interval shorter than the half-cycle equivalent interval. It can also be a certain thing.

  Furthermore, the book of the aspect which controls a 2nd inverter circuit so that an electric current may flow into the normal phase except an abnormal phase, and the voltage of an electric power bus may be adjusted when any phase of a 2nd electric motor is abnormal. In the drive device of the invention, the charging control unit turns off a switching element corresponding to a phase other than an arbitrary one phase of the second electric motor among a plurality of switching elements of the inverter circuit and the second inverter circuit. Whether any one phase of the second motor is normal based on the voltage of the power bus when the switching element corresponding to the one phase of the second motor is switched in the state It can also be a means for determining whether or not. If it carries out like this, it can be determined whether it is normal about each phase of the 2nd electric motor.

  Or the book of the aspect which controls a 2nd inverter circuit so that an electric current may flow into the normal phase except an abnormal phase, and the voltage of an electric power bus may be adjusted when either phase of a 2nd electric motor is abnormal In the driving device of the invention, the high voltage system to which the inverter circuit and the second inverter circuit are connected and the low voltage system to which the power storage means are connected are configured to boost the voltage of the low voltage system and It is also possible to provide voltage conversion means that can supply the high voltage system and step down the voltage of the high voltage system and supply it to the low voltage system.

The vehicle of the present invention
An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements, and an electric storage means that can exchange electric power with the electric motor via the inverter circuit A vehicle comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source while the neutral point of the motor is connected to an external power source that is a power source outside the vehicle during parking A charging time control means for controlling the inverter circuit so that the current storage means is charged by a current flowing in a normal phase excluding the abnormal phase when any phase of the electric motor is abnormal When,
It is a summary to provide.

  In the vehicle of the present invention, when charging the power storage means using electric power from the external power source in a state where the neutral point of the electric motor is connected to an external power source that is an external power source during parking, each phase of the electric motor is If any of the phases of the motor is abnormal, the inverter circuit is controlled so that the current flows in the normal phase excluding the abnormal phase and the power storage means is charged. Thereby, even when abnormality occurs in any phase of the electric motor or the inverter circuit, the power storage means can be charged.

The method for charging the power storage device of the present invention includes:
An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the motor by switching of the plurality of switching elements, and a power storage device that can exchange electric power with the motor via the inverter circuit A method of charging a power storage device in a drive device comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source in a state where the neutral point of the motor is connected to an external power source that is a power source outside the driving device Determining whether or not, when any phase of the electric motor is abnormal, control the inverter circuit so that a current flows in a normal phase excluding the abnormal phase and the power storage means is charged,
It is characterized by that.

  In the charging method of the power storage device of the present invention, when charging the power storage means using the power from the external power source in a state where the neutral point of the motor is connected to the external power source that is a power source outside the drive device, It is determined whether or not each phase of the motor is normal, and when any phase of the motor is abnormal, the inverter circuit is controlled so that a current flows in a normal phase excluding the abnormal phase and the power storage means is charged. . Thereby, even when abnormality occurs in any phase of the electric motor or the inverter circuit, the power storage means can be charged.

  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 drive device as an embodiment of the present invention. In the hybrid vehicle 20 of the embodiment, a carrier is connected to an engine 22, an engine electronic control unit (hereinafter referred to as an engine ECU) 24 that controls the operation of the engine 22, and a crankshaft 26 of the engine 22, and driving wheels. A planetary gear mechanism 30 in which a ring gear is connected to a drive shaft 32 serving as a drive shaft coupled to a differential gear 38 to 39a and 39b; a motor MG1 capable of generating electricity connected to a sun gear of the planetary gear mechanism 30; For exchanging electric power between the motor MG2 capable of generating and outputting power to the drive shaft 32, inverters 41 and 42 as drive circuits for the motors MG1 and MG2, the battery 50, and the inverters 41 and 42 and the battery 50 Booster circuit 55 for adjusting the voltage and battery 50 A system main relay 56 that connects and disconnects the circuit 55, a parking lock mechanism 60 that locks the drive wheels 39a and 39b when the shift position is the parking position, and a hybrid electronic control unit 70 that controls the entire vehicle. With.

  FIG. 2 is a configuration diagram centering on an electric system of the hybrid vehicle 20 of the embodiment. Each of the motor MG1 and the motor MG2 is configured as a well-known synchronous generator motor including a rotor having a permanent magnet attached to the outer surface and a stator around which a three-phase coil is wound. The inverters 41 and 42 are composed of six transistors T11 to T16 and T21 to 26 and six diodes D11 to D16 and D21 to D26 connected in parallel to the transistors T11 to T16 and T21 to T26 in the reverse direction. Yes. In the embodiment, the transistors T11 to T16 and T21 to 26 correspond to the “switching element” of the present invention. Two transistors T11 to T16 and T21 to T26 are arranged in pairs so that each of the inverters 41 and 42 becomes a source side and a sink side with respect to the positive electrode bus 54a and the negative electrode bus 54b shared by the power line 54. Each of the three-phase coils (U-phase, V-phase, W-phase) of the motors MG1, MG2 is connected to each connection point between the paired transistors. Therefore, a rotating magnetic field is formed in the three-phase coil by controlling the ratio of the on-time of the transistors T11 to T16 and T21 to T26 that make a pair while a voltage is acting between the positive electrode bus 54a and the negative electrode bus 54b. The motors MG1, MG2 can be driven to rotate. Since the inverters 41 and 42 share the positive bus 54a and the negative bus 54b, the electric power generated by either the motor MG1 or MG2 can be supplied to another motor. A smoothing capacitor 57 is connected to the positive electrode bus 54a and the negative electrode bus 54b. In the following description, the transistors T11 to T13 are collectively referred to as “first upper arm”, the transistors T14 to T16 are collectively referred to as “first lower arm”, the transistors T21 to T23 are collectively referred to as “second upper arm”, and the transistors T24 to T13 T26 may be collectively referred to as “second lower arm”.

  Further, as shown in FIG. 2, a vehicle-side connector 80 is connected to the neutral points N1 and N2 of the motors MG1 and MG2 via an AC port 82. The vehicle-side connector 80 is formed to be connectable to an external power-side connector 92 that is connected to an AC external power source (for example, a household power source (AC100V)) 90 that is a power source outside the vehicle. The AC port 82 includes an AC port relay 84 that connects and disconnects the power lines 88a and 88b connected to the neutral points N1 and N2 of the motors MG1 and MG2 and the vehicle-side connector 80, and a vehicle-side connector 80. And a voltage sensor 86 for detecting an input voltage Vin input from the external power supply 90 when the external power supply side connector 92 is connected.

  As shown in FIG. 2, the booster circuit 55 includes two transistors T31 and T32, two diodes D31 and D32 connected in parallel to the transistors T31 and T32 in the reverse direction, and a reactor L. The two transistors T31 and T32 are connected to the positive bus 54a and the negative bus 54b of the inverters 41 and 42, respectively, and the reactor L is connected to the connection point. Further, a positive terminal and a negative terminal of battery 50 are connected to reactor L and negative bus 54b, respectively. Therefore, by turning on / off the transistors T31 and T32, the voltage of the DC power of the battery 50 is boosted and supplied to the inverters 41 and 42, or the DC voltage acting on the positive bus 54a and the negative bus 54b is lowered. The battery 50 can be charged. A smoothing capacitor 58 is connected to the reactor L and the negative electrode bus 54b.

  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 high voltage from a voltage sensor 57a that detects a voltage on the high voltage side (hereinafter referred to as a high voltage system) of the booster circuit 55 (a voltage between the positive bus 54a and the negative bus 54b). The low voltage system from the voltage sensor 58a that detects the system voltage Vh and the voltage on the low voltage side (hereinafter referred to as the low voltage system) of the booster circuit 55 (the voltage between the battery 50 side of the reactor L and the negative electrode bus 54b). Voltage Vl, a detection signal from the connector sensor 81 that detects whether the vehicle-side connector 80 and the external power supply-side connector 92 are connected to each other, an input voltage Vin from the voltage sensor 86, The rotational position of the rotor from a rotational position detection sensor (not shown) that detects the rotational position of the rotor of the motors MG1 and MG2 is attached to the inverters 41 and 42. Phase current from a current sensor (not shown), voltage between terminals of a battery 50 from a voltage sensor (not shown) attached between output terminals of the battery 50, battery 50 from a current sensor (not shown) attached to an output terminal of the battery 50 The charge / discharge current Ib is input through the input port, and although not shown, the shift position from the shift position sensor that detects the ignition signal from the ignition switch and the operation position of the shift lever, and the depression amount of the accelerator pedal The accelerator opening from the accelerator pedal position sensor that detects the depression, the brake pedal position from the brake pedal position sensor that detects the depression amount of the brake pedal, the vehicle speed V from the vehicle speed sensor, and the like are also input via the input port. Also, from the hybrid electronic control unit 70, switching signals to the transistors T11 to T16 and T21 to T26 of the inverters 41 and 42, switching control signals to the transistors T31 and T32 of the booster circuit 55, and driving to the system main relay 56 A signal, a drive signal to the parking lock mechanism 60, a drive signal to the AC port relay 84, and the like are output via the output port. The hybrid electronic control unit 70 is connected to the engine ECU 24 via a communication port, and exchanges various control signals and data with the engine ECU 24. The hybrid electronic control unit 70 calculates the remaining capacity SOC based on the integrated value of the charge / discharge current Ib detected by the current sensor.

  The hybrid vehicle 20 of the embodiment thus configured calculates a required torque to be output to the drive shaft 32 based on the accelerator opening and the vehicle speed corresponding to the depression amount of the accelerator pedal by the driver, and corresponds to this required torque. The engine 22, the motor MG1, and the motor MG2 are controlled to operate so that the required power to be output is output to the drive shaft 32. As the operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that the power corresponding to the required power is output from the engine 22, and all the power output from the engine 22 is the planetary gear 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 drive shaft 32, and the power required for charging / discharging the battery 50. The engine 22 is operated and controlled so that a suitable power is output from the engine 22, and all or a part of the power output from the engine 22 with charging / discharging of the battery 50 is transmitted to the planetary gear mechanism 30, the motor MG1, and the motor MG2. With the torque conversion caused by A charge / discharge operation mode for driving and controlling the motor MG1 and the motor MG2 to be output, a motor operation mode for controlling the operation to stop the operation of the engine 22 and output the power corresponding to the required power from the motor MG2 to the drive shaft 32, etc. There is.

  Further, in the hybrid vehicle 20 of the embodiment thus configured, when the shift position is the parking position, the external power supply side connector 92 connected to the external power supply 90 and the vehicle side connector 80 are connected to each other in the AC port. The battery 50 can be charged using the electric power from the external power supply 90 by turning on the relay 84 and the system main relay 56 to control the switching of the switching elements of the inverters 41 and 42. Thus, by charging the battery 50 using the electric power from the external power supply 90 before the start of traveling, the traveling can be started in a state where the remaining capacity SOC of the battery 50 is relatively high. When the shift position is the parking position, the driving wheels 39a and 39b are locked by the parking lock mechanism 60.

  Next, the operation of the hybrid vehicle 20 of the embodiment configured as described above, particularly the operation when the battery 50 is charged using the electric power from the external power supply 90 when the shift position is the parking position will be described. FIG. 3 is a flowchart showing an example of a charging control routine executed by the hybrid electronic control unit 70. This routine is performed when the vehicle-side connector 80 and the external power supply-side connector 92 are connected or when a predetermined time (for example, several minutes) has elapsed since the vehicle-side connector 80 and the external power supply-side connector 92 are connected. To be executed. Whether or not the vehicle side connector 80 and the external power source side connector 92 are connected is determined based on a detection signal from the connector sensor 81. In this embodiment, before starting this routine, when the system main relay 56 is on, the battery 50 is disconnected from the booster circuit 55 by turning it off.

  When the charging control routine is executed, the CPU 72 of the hybrid electronic control unit 70 first turns on the AC port relay 84 (step S100), and each phase of the motors MG1, MG2 (U phase, V phase, W). It is determined whether or not the phase is normal (step S110). In this embodiment, this determination is made by sequentially selecting the transistors corresponding to the respective phases of the three-phase coils (U phase, V phase, W phase) of the motors MG1, MG2 among the transistors T11 to T16, T21 to T26 of the inverters 41 and 42. It was performed based on the high voltage system voltage Vh from the voltage sensor 57a when the power was turned on / off. Specifically, the transistors T11 and T14 are switched by so-called sinusoidal PWM control according to the phase of the input voltage Vin in a state where the transistors T12, T13, T15, T16, and T21 to T26 are turned off, and the U of the motor MG1 Whether or not the U phase of the motor MG1 is normal by checking whether or not the high voltage system voltage Vh at this time is within a predetermined allowable range by experiment or the like so that current flows only in the phase. In the same manner, it is determined whether the V phase and W phase of the motor MG1 and the U phase, V phase and W phase of the motor MG2 are normal. In addition, abnormality of each phase of the three-phase coils (U-phase, V-phase, W-phase) of motors MG1, MG2 includes abnormality of coil winding.

  Subsequently, the target remaining capacity SOC * of the battery 50 and the target voltage Vh * of the high voltage system for charging the battery 50 are input (step S120), and the system main relay 56 is turned on so that the battery 50 is boosted. (Step S130). Here, the target remaining capacity SOC * is determined in order to enable traveling in a motor operation mode of a certain distance when the next traveling is performed, for example, 80%, 85%, 90%, etc. The value of is set. Further, the target voltage Vh * of the high voltage system is determined in a range higher than the rated value Vbrv of the terminal voltage of the battery 50. For example, when the rated value Vbrv of the terminal voltage of the battery 50 is 250V, 280V, or 300V. Values such as 450V, 480V, and 500V are set.

  Then, the input voltage Vin from the voltage sensor 86 is input (step S140), and when any phase of the motors MG1 and MG2 is abnormal, the motors MG1 and MG1 of the transistors T11 to T16 and T21 to T26 of the inverters 41 and 42 are detected. The transistor corresponding to the abnormal phase of MG2 is kept off (step S150). This process is not performed when all phases of motors MG1 and MG2 are normal. Of the transistors T11 to T16 of the inverter 41, the transistors corresponding to the normal phase of the motor MG1 are subjected to switching control according to the phase of the input voltage Vin (step S160), and the motor of the transistors T21 to T26 of the inverter 42 is controlled. The transistor corresponding to the normal phase of MG2 is subjected to switching control based on the target voltage Vh * and the input voltage Vin so that the high voltage system voltage Vh becomes the target voltage Vh * (step S170). The transistors T31 and T32 are subjected to switching control so that the high-voltage system voltage Vh is stepped down and the battery 50 is charged (step S180). Hereinafter, the control of inverters 41 and 42 will be described first when all phases of motors MG1 and MG2 are normal, and then when any phase of motors MG1 and MG2 is abnormal.

  First, control of inverters 41 and 42 when all phases of motors MG1 and MG2 are normal will be described. FIG. 4 shows an example of the time variation of the input voltage Vin and the first upper arm (transistors T11 to T13) and the first lower arm (transistors T14 to T16) when all phases of the motor MG1 are normal. It is explanatory drawing. As illustrated in FIG. 4, the transistors T11 to T16 of the inverter 41 turn on the first upper arm and turn off the first lower arm when the input voltage Vin is positive, and turn off the first upper arm when the input voltage Vin is negative. 1 The upper arm is turned off and the first lower arm is turned on. That is, the first upper arm and the first lower arm are alternately turned on at a half cycle equivalent interval (for example, 10 msec for 50 Hz) that is a time interval corresponding to a half cycle of the phase of the input voltage Vin. , The on / off state of the first lower arm is switched. In this case, the potential Vn1 of the neutral point N1 of the motor MG1 approaches the potential of the positive bus 54a when the input voltage Vin is positive, and approaches the potential of the negative bus 54b when the input voltage Vin is negative. In this case, the current flowing in each phase of the motor MG1 is substantially equal. For the transistors T21 to T26 of the inverter 42, the duty ratio Du is set based on the target voltage Vh * and the input voltage Vin, a PWM signal is generated using the set duty ratio Du, and the generated PWM signal is converted to the transistor T21. To T26, the second upper arm (transistors T21 to T23) is turned on and the second lower arm (transistors T24 to T26) is turned off, or the second upper arm is turned off and the second lower arm is turned on. And That is, the second upper arm and the second lower arm are alternately turned on at a time interval (for example, 50 μsec, 100 μsec, etc.) shorter than the half-cycle equivalent interval using the duty ratio Du according to the target voltage Vh * and the input voltage Vin. Thus, the on / off state of the second upper arm and the second lower arm is switched. Thereby, the three-phase coil of motor MG2 and inverter 42 can function as a boost converter, and high-voltage system voltage Vh can be brought close to target voltage Vh *. In this case, the current flowing in each phase of the motor MG2 is substantially equal. By controlling the inverters 41 and 42, the battery 50 can be charged with electric power from the external power supply 90 with the high-voltage voltage Vh in the vicinity of the target voltage Vh *.

  Next, control of inverters 41 and 42 when either phase of motors MG1 and MG2 is abnormal will be described. When any phase of the motor MG1 is abnormal, among the transistors T11 to T16 of the inverter 41, the transistor corresponding to the abnormal phase of the motor MG1 (for example, the transistors T11 and T14 when the U phase of the motor MG1 is abnormal) Holds the off state, and the transistor corresponding to the normal phase of the motor MG1 switches the on / off state at intervals equivalent to a half cycle as in the case where all the phases of the motor MG1 are normal. In this case, the currents flowing in the normal phases of motor MG1 are substantially equal. Further, when any phase of motor MG2 is abnormal, among transistors T21 to T26 of inverter 42, the transistor corresponding to the abnormal phase of motor MG2 is kept off, and corresponds to the normal phase of motor MG2. As for the transistors to be turned on / off, the duty ratio Du corresponding to the target voltage Vh * and the input voltage Vin is used to switch the on / off state at a time interval shorter than the half-cycle equivalent interval, as in the case where all the phases of the motor MG2 are normal. As a result, the coil of each normal phase of the motor MG2 and the transistor of the inverter 42 corresponding to each normal phase can function as a boost converter, and the high voltage system voltage Vh can be brought close to the target voltage Vh *. In this case, the currents flowing in the normal phases of motor MG2 are substantially equal. By such control of the inverters 41 and 42, even when an abnormality occurs in any of the phases of the motors MG1 and MG2, a current flows through the normal phase of the motors MG1 and MG2, and the battery 50 can be charged.

  Then, the remaining capacity SOC of the battery 50 calculated based on the integrated value of the charge / discharge current Ib of the battery 50 by the remaining capacity calculation routine (not shown) is input (step S190), and the input remaining capacity SOC is used as the target remaining capacity SOC. * (Step S200), when the remaining capacity SOC becomes near the target remaining capacity SOC * by repeatedly executing the processing of steps S140 to S200 until the remaining capacity SOC becomes near the target remaining capacity SOC *. The main relay 56 and the AC port relay 84 are turned off (step S210), and the charging control routine is terminated.

  According to the hybrid vehicle 20 of the embodiment described above, when the external power supply side connector 92 connected to the external power supply 90 and the vehicle side connector 80 are connected and the battery 50 is charged, the AC port relay 84 is connected. It is determined whether or not each phase of the motors MG1 and MG2 is normal. After the determination, the system main relay 56 is turned on, and the motors MG1 and MG2 of the transistors T11 to T16 and T21 to T26 of the inverters 41 and 42 are turned on. Even when an abnormality occurs in any of the phases of the motors MG1 and MG2, the transistors corresponding to the abnormal phases are kept off and only the transistors corresponding to the normal phases of the motors MG1 and MG2 are controlled to be turned on / off. The battery 50 can be charged by passing a current through the normal phases of the motors MG1 and MG2.

  In the hybrid vehicle 20 of the embodiment, the transistors corresponding to the normal phase of the motor MG1 among the transistors T11 to T16 of the inverter 41 are switched on and off at intervals corresponding to half cycles, and the motor MG2 of the transistors T21 to T26 of the inverter 42 is switched. The transistors corresponding to the normal phases of the transistors T11 to T16 are switched on and off at a time interval shorter than the half-cycle equivalent interval using the duty ratio Du according to the target voltage Vh * and the input voltage Vin. Among the transistors corresponding to the normal phase of the motor MG1, the on / off state is switched at a time interval shorter than the half-cycle equivalent interval using the duty ratio Du according to the target voltage Vh * and the input voltage Vin, and the transistor of the inverter 42 T21-T26 The transistors corresponding to the normal phases of the motor MG2 may be to switch on and off states at the half-period correspondence distance.

  In the hybrid vehicle 20 of the embodiment, the booster circuit 55 is provided. However, a configuration without such a booster circuit may be employed.

  In the embodiments and modifications, the present invention has been described as being applied to a so-called parallel type hybrid vehicle. However, the engine, a generator that generates electric power using all of the power from the engine, and an electric motor that outputs driving power, It may be applied to a so-called series-type hybrid vehicle equipped with a battery that exchanges power with a generator or electric motor, or it may be applied to an ordinary electric vehicle that runs only with the power from the motor without an engine. It is good also as what to do.

  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 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 motor MG1 corresponds to the “motor”, the inverter 41 corresponds to the “inverter circuit”, the battery 50 corresponds to the “power storage unit”, and the external power supply side connector 92 connected to the external power supply 90 and the vehicle When the side connector 80 is connected to charge the battery 50, the AC port relay 84 is turned on to determine whether each phase of the motors MG1 and MG2 is normal. The transistors corresponding to the abnormal phases of the motors MG1 and MG2 among the transistors T11 to T16 and T21 to T26 of the inverters 41 and 42 are kept off, and only the transistors corresponding to the normal phases of the motors MG1 and MG2 are maintained. The hybrid electronic control unit 70 that executes the charging control routine of FIG. It corresponds to the control unit ". Further, the motor MG2 corresponds to a “second electric motor”, and the inverter 42 corresponds to a “second inverter circuit”. Further, the booster circuit 55 corresponds to “voltage converting means”.

Here, the “motor” is not limited to the motor MG1 configured as a synchronous generator motor, and any motor can be used as long as it is rotationally driven by polyphase AC. The “inverter circuit” is not limited to the inverter 41 and may be any circuit as long as it has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements. The “power storage means” is not limited to the battery 50 and may be anything as long as it can exchange electric power with the electric motor via an inverter circuit. As the “charging control means”, when the external power supply side connector 92 connected to the external power supply 90 and the vehicle side connector 80 are connected to charge the battery 50, the AC port relay 84 is turned on to turn on the motor MG1. , MG2 is determined whether each phase is normal, the system main relay 56 is turned on after the determination, and the motors MG1, MG2 out of the transistors T11-T16, T21-T26 of the inverters 41, 42 are turned into abnormal phases. The corresponding transistor is not limited to the one that holds the off state and controls only the transistor corresponding to the normal phase of the motors MG1 and MG2,
When charging the power storage means using the power from the external power source with the neutral point of the motor connected to the external power source that is the power source outside the drive unit, determine whether each phase of the motor is normal When any phase of the motor is abnormal, any circuit may be used as long as it controls the inverter circuit so that the current flows in the normal phase excluding the abnormal phase and the power storage means is charged. The “second electric motor” is not limited to the motor MG2 configured as a synchronous generator motor, and may be anything as long as it is rotationally driven by polyphase alternating current. The “inverter circuit” is not limited to the inverter 42, and any inverter circuit may be used as long as it has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements. The “voltage conversion means” is not limited to the booster circuit 55, but is connected to a high voltage system to which the inverter circuit and the second inverter circuit are connected and a low voltage system to which the storage means is connected. As long as the voltage of the voltage system can be boosted and supplied to the high voltage system, and the voltage of the high voltage system can be stepped down and supplied to the low voltage system, any voltage may be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The 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 drive device and vehicle manufacturing industries.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 equipped with a drive device as one embodiment of the present invention. It is a block diagram centering on the electric system of the hybrid vehicle 20 of an Example. 5 is a flowchart showing an example of a control routine at the time of charging executed by the hybrid electronic control unit 70. It is explanatory drawing which shows an example of the mode of the time change of the voltage Vps of the external power supply 90, and a 1st upper arm and a 1st lower arm when all the phases of motor MG1 are normal.

Explanation of symbols

  20 hybrid vehicle, 22 engine, 24 engine ECU, 26 crankshaft, 30 planetary gear mechanism, 32 drive shaft, 38 differential gear, 39a, 39b drive wheel, 41, 42 inverter, 50 battery, 54 power line, 54a positive bus, 54b negative bus, 55 booster circuit, 56 system main relay, 57, 58 capacitor, 57a, 57b voltage sensor, 60 parking lock mechanism, 70 hybrid electronic control unit, 72 CPU, 74 ROM, 76 RAM, 80 vehicle side connector, 81 connector sensor, 82 AC port, 84 AC port relay, 86 voltage sensor, 88a, 88b power line, 90 external power supply, 92 external power supply side connector, D11-D16, D21-D2 , D31, D32 diodes, MG1, MG2 motor, T11~T16, T21~T26, T31, T32 transistor, N1, N2 neutral point.

Claims (10)

An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements, and an electric storage means that can exchange electric power with the electric motor via the inverter circuit A drive device comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source in a state where the neutral point of the motor is connected to an external power source that is a power source outside the driving device A charging time control means for controlling the inverter circuit so that the current storage means is charged by a current flowing in a normal phase excluding the abnormal phase when any phase of the electric motor is abnormal When,
A drive device comprising:   2. The drive device according to claim 1, wherein the charging control unit is a unit that maintains an off state for a switching element corresponding to an abnormal phase of the electric motor among the plurality of switching elements of the inverter circuit.   The charging time control means is configured to perform switching corresponding to any one phase of the electric motor in a state in which a switching element corresponding to a phase other than the arbitrary one phase of the electric motor is turned off among the plurality of switching elements of the inverter circuit. 3. The drive unit according to claim 1, wherein the drive unit is a unit that determines whether or not any one phase of the electric motor is normal based on a voltage on the power storage unit side from the inverter circuit when the element is switched. . A drive device according to any one of claims 1 to 3, comprising:
A second electric motor that is rotationally driven by polyphase alternating current;
A second inverter circuit that shares a power bus with the first inverter circuit, has a plurality of switching elements, and drives the second electric motor by switching of the plurality of switching elements;
With
The power storage means can exchange electric power with the electric motor and the second electric motor via the inverter circuit and the second inverter circuit,
The charging control means determines whether or not each phase of the second motor is normal, and when any phase of the motor is abnormal, current is supplied to a normal phase excluding the abnormal phase. Means for controlling the second inverter circuit to flow and adjust the voltage of the power bus;
Drive device.   5. The drive according to claim 4, wherein the charging control unit is a unit that maintains an off state for a switching element corresponding to an abnormal phase of the second electric motor among the plurality of switching elements of the second inverter circuit. 6. apparatus.   The charging control means includes a time interval corresponding to a half cycle of a phase of an input voltage input from the external power supply for a switching element corresponding to a normal phase of the motor among a plurality of switching elements of the inverter circuit. The inverter circuit is controlled so that the on / off state is switched at an interval equivalent to a certain half cycle, and the switching cycle corresponding to the normal phase of the second motor among the plurality of switching devices of the second inverter circuit is the half cycle. 6. The driving device according to claim 4, wherein the driving device is a means for controlling the second inverter circuit so that the on / off state is switched at a time interval shorter than a corresponding interval.   The charging time control means is in a state where a switching element corresponding to a phase other than an arbitrary one phase of the second electric motor among a plurality of switching elements of the inverter circuit and the second inverter circuit is turned off. Means for determining whether or not any one phase of the second motor is normal based on the voltage of the power bus when switching of the switching element corresponding to the one phase of the second motor is performed The drive device according to any one of claims 4 to 6, wherein   Connected to a high voltage system to which the inverter circuit and the second inverter circuit are connected and a low voltage system to which the storage means is connected, and can boost the voltage of the low voltage system and supply it to the high voltage system The drive device according to any one of claims 4 to 7, further comprising voltage conversion means that can step down the voltage of the high-voltage system and supply the voltage to the low-voltage system. An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the electric motor by switching of the plurality of switching elements, and an electric storage means that can exchange electric power with the electric motor via the inverter circuit A vehicle comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source while the neutral point of the motor is connected to an external power source that is a power source outside the vehicle during parking A charging time control means for controlling the inverter circuit so that the current storage means is charged by a current flowing in a normal phase excluding the abnormal phase when any phase of the electric motor is abnormal When,
A vehicle comprising: An electric motor that is rotationally driven by polyphase alternating current, an inverter circuit that has a plurality of switching elements and drives the motor by switching of the plurality of switching elements, and a power storage device that can exchange electric power with the motor via the inverter circuit A method of charging a power storage device in a drive device comprising:
Whether or not each phase of the motor is normal when charging the power storage means using electric power from the external power source in a state where the neutral point of the motor is connected to an external power source that is a power source outside the driving device Determining whether or not, when any phase of the electric motor is abnormal, control the inverter circuit so that a current flows in a normal phase excluding the abnormal phase and the power storage means is charged,
A method for charging a power storage device.

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