Drive device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomoko Oba
Life of this patent
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Abstract
There is provided a drive device configured to impose a more appropriate limitation on driving of a motor. The drive device comprises a motor configured to generate an induced voltage according to a rotation speed, and an inverter configured to drive the motor. Upon satisfaction of a predetermined condition to impose a limitation on driving of the motor, the drive device performs a drive limitation that imposes a larger limitation on driving of the motor when the induced voltage of the motor is higher than an input voltage that is input from a power storage device side to the inverter, compared with a limitation imposed when the induced voltage of the motor is equal to or lower than the input voltage.
Claims2
A drive device, comprising:
- a motor configured to generate an induced voltage according to a rotation speed;
- an inverter configured to drive the motor;
- a power storage device configured to supply electric power to the motor via the inverter;
- and
- a control device configured to control the inverter,
- wherein upon satisfaction of a predetermined condition to impose a limitation on driving of the motor, the control device
- imposes a first driving limitation on driving of the motor when the induced voltage of the motor is higher than an input voltage that is input from the power storage device side to the inverter, and
- imposes a second driving limitation that is larger than the first driving limitation on driving of the motor when the induced voltage of the motor is equal to or lower than the input voltage,
- wherein the second driving limitation is equal to the first driving limitation in a first range in which a temperature of the inverter is lower than a predetermined temperature, and is larger than the first driving limitation in a second range in which the temperature of the inverter is higher than or equal to the predetermined temperature,
- wherein the drive device stores a first map indicating the first driving limitation, and a second map indicating the second driving limitation,
- wherein the control device applies the first map when the induced voltage is higher than the input voltage, and applies the second map when the induced voltage of the motor is equal to or lower than the input voltage, and
- wherein a first rate of motor torque decrease per inverter temperature increase in the first map is less than a second rate of motor torque decrease per inverter temperature increase in the second map.
Dependencies are inferred from the claim text.