Control Apparatus for Electric Vehicle, Control System for Electric Vehicle, and Control Method for Electric Vehicle
AssigneeHitachi Automotive Systems, Ltd.
InventorsKeisuke SUZUKI, Hitoshi KOBAYASHI, Kazuya TAKAHASHI
Life of this patent
Estimating the term…
Abstract
Provided is a control apparatus for an electric vehicle, which is capable of suppressing simultaneous slip of front and rear wheels. The control apparatus for an electric vehicle includes a control portion configured to control a front electric motor and a rear electric motor so that an achievement rate of a torque command with respect to a target torque in one motor of the front and rear electric motors is lower than the achievement rate in the other motor of the front and rear electric motors.
Claims20
A control apparatus for an electric vehicle including a front electric motor which outputs torque to front wheels of a vehicle and a rear electric motor which outputs torque to rear wheels of the vehicle, the control apparatus comprising:
- a target torque calculation portion configured to calculate target torques for the front electric motor and the rear electric motor;
- a torque command portion configured to output torque commands to the front electric motor and the rear electric motor;
- and
- a control portion configured to control the front electric motor and the rear electric motor so that an achievement rate of the torque command with respect to the target torque in one motor of the front electric motor and the rear electric motor is lower than the achievement rate in the other motor of the front electric motor and the rear electric motor.
A control apparatus for an electric vehicle including a front electric motor which outputs torque to front wheels of a vehicle and a rear electric motor which outputs torque to rear wheels of the vehicle, the control apparatus comprising:
- a control portion configured to control the front electric motor and the rear electric motor so that a difference between a value obtained by dividing an actual torque differential value in one motor of the front electric motor and the rear electric motor by an accelerator pedal opening speed, and a value obtained by dividing an actual torque differential value in the other motor of the front electric motor and the rear electric motor by the accelerator pedal opening speed increases as the accelerator pedal opening speed increases.
A control method for an electric vehicle including a front electric motor which outputs torque to front wheels of a vehicle and a rear electric motor which outputs torque to rear wheels of the vehicle, the control method comprising:
- calculating target torques for the front electric motor and the rear electric motor;
- outputting torque commands to the front electric motor and the rear electric motor;
- and
- controlling the front electric motor and the rear electric motor so that an achievement rate of the torque command with respect to the target torque in one motor of the front electric motor and the rear electric motor is lower than the achievement rate in the other motor of the front electric motor and the rear electric motor.
A control system for an electric vehicle, the control system comprising:
- a front electric motor configured to output torque to front wheels of a vehicle;
- a rear electric motor configured to output torque to rear wheels of the vehicle;
- and
- a control unit configured to control the front electric motor and the rear electric motor,
- wherein the control unit comprises:
- a target torque calculation portion configured to calculate target torques for the front electric motor and the rear electric motor;
- a torque command portion configured to output torque commands to the front electric motor and the rear electric motor;
- and
- a control portion configured to control the front electric motor and the rear electric motor so that an achievement rate of the torque command with respect to the target torque in one motor of the front electric motor and the rear electric motor is lower than the achievement rate in the other motor of the front electric motor and the rear electric motor.
Dependencies are inferred from the claim text.