Vehicle and control method for vehicle
An inverter converts input DC power into AC power and supplies the AC power to a motor generator. An inverter control unit executes shutdown control for stopping power conversion by the inverter, when operation of the motor generator is not requested. A transmission control unit controls the transmission. When a state quantity related to a rotation speed of the motor generator increases to a prescribed quantity during execution of the shutdown control, the inverter control unit continues the shutdown control and the transmission control unit executes shift control for controlling the transmission to reduce the rotation speed of the motor generator.
1. A vehicle, comprising:
a rotating electric machine;
a transmission provided between said rotating electric machine and a driving wheel;
an inverter for converting input DC power into AC power and supplying the AC power to said rotating electric machine;
an inverter control unit for executing shutdown control for stopping power conversion by said inverter, when operation of said rotating electric machine is not requested; and
a transmission control unit for controlling said transmission, wherein
when a state quantity related to a rotation speed of said rotating electric machine increases to a prescribed quantity during execution of said shutdown control, said inverter control unit continues said shutdown control and said transmission control unit executes shift control for controlling said transmission to reduce the rotation speed of said rotating electric machine.
2. The vehicle according to claim 1 , wherein
when said shutdown control is not in execution while said vehicle is running, said transmission control unit controls said transmission to execute shifting with output of driving force by said rotating electric machine.
3. The vehicle according to claim 1 , further comprising:
an internal combustion engine;
a triaxial power split device mechanically coupled to an output shaft of said internal combustion engine, a rotation shaft of said rotating electric machine and a drive shaft; and
an other rotating electric machine coupled to said drive shaft, wherein
said transmission is coupled between said drive shaft and said driving wheel, and
when said state quantity increases to said prescribed quantity in the case where, during execution of said shutdown control, said internal combustion engine is in a stop state and said vehicle is running by using driving force of said other rotating electric machine, said inverter control unit continues said shutdown control and said transmission control unit executes said shift control by using the driving force of said other rotating electric machine.
4. The vehicle according to claim 1 , further comprising
an internal combustion engine coupled to a rotation shaft of said rotating electric machine, wherein
said transmission is coupled between the rotation shaft of said rotating electric machine and said driving wheel, and
when said state quantity increases to said prescribed quantity in the case where, during execution of said shutdown control, said vehicle is running by using driving force of said internal combustion engine, said inverter control unit continues said shutdown control and said transmission control unit executes said shift control.
5. The vehicle according to claim 1 , wherein
when a value obtained by subtracting a counter-electromotive voltage of said rotating electric machine from a voltage of said DC power falls below a first prescribed value, said inverter control unit cancels said shutdown control,
when the value obtained by subtracting the counter-electromotive voltage of said rotating electric machine from the voltage of said DC power falls below a second prescribed value, said transmission control unit executes said shift control, and
said first prescribed value is smaller than said second prescribed value.
6. A control method for a vehicle,
said vehicle comprising:
a rotating electric machine;
a transmission provided between said rotating electric machine and a driving wheel; and
an inverter for converting input DC power into AC power and supplying the AC power to said rotating electric machine,
said control method comprising the steps of:
executing shutdown control for stopping power conversion by said inverter, when operation of said rotating electric machine is not requested; and
executing, while continuing said shutdown control, shift control for controlling said transmission to reduce a rotation speed of said rotating electric machine, when a state quantity related to the rotation speed of said rotating electric machine increases to a prescribed quantity during execution of said shutdown control.