ELECTRIC VEHICLE

• US 20150112535A1
• Filed: 10/15/2014
• Published: 04/23/2015
• Est. Priority Date: 10/17/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ota, Takashi
• Granted Patent: US 9,428,079 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 15/36 with automatic control superimposed, e.g. to prevent excessive motor current
• CPC Class Codes: B60L 2220/12 Induction machines
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2220/42 with use of more than one motor
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2240/429 Current
• CPC Class Codes: B60L 2250/26 by pedal actuation
• CPC Class Codes: B60L 2260/28 Four wheel or all wheel drive
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electric vehicle includes: a synchronous motor; an induction motor; and a control unit configured to adjust a torque from the synchronous motor and a torque from the induction motor, wherein the control unit includes a torque varying device configured to reduce an output torque from the synchronous motor while maintaining a total drive force of the electric vehicle, and increasing an output torque from the induction motor in the case where the electric vehicle is stopped in a state in which a torque is output from the synchronous motor. Accordingly, there is provided an electric vehicle capable of restraining deterioration of drivability and performing thermal protection of a motor and a control unit.

Claims

1. An electric vehicle comprising:

a synchronous motor for driving a vehicle;

an induction motor for driving the vehicle; and

a control unit configured to adjust a torque of the synchronous motor and a torque from the induction motor, wherein

the control unit includes a torque varying device configured to reduce an output torque from the synchronous motor while maintaining a total drive force of the electric vehicle, and increasing an output torque from the induction motor in the case where the electric vehicle is stopped in a state in which a torque is output from the synchronous motor.

2. The electric vehicle according to claim 1, wherein

the torque varying device of the control unit

stops an output of the torque from the synchronous motor, and changes the output torque from the induction motor into a torque corresponding to the total drive force of the electric vehicle.

3. An electric vehicle comprising:

a synchronous motor for driving a vehicle;

an induction motor for driving the vehicle; and

a control unit including a CPU, and configured to adjust a torque from the synchronous motor and a torque from the induction motor, wherein

the control unit executes a torque varying program including reducing an output torque from the synchronous motor while maintaining a total drive force of the electric vehicle, and increasing by means of the CPU an output torque from the induction motor in the case where the electric vehicle is stopped in a state in which a torque is output from the synchronous motor.

4. A method of controlling an electric vehicle including:

a synchronous motor for driving a vehicle;

an induction motor for driving the vehicle; and

a control unit configured to adjust a torque from the synchronous motor and a torque from the induction motor, comprising;

reducing an output torque from the synchronous motor while maintaining a total drive force of the electric vehicle, and increasing an output torque from the induction motor in the case where the electric vehicle is stopped in a state in which a torque is output from the synchronous motor.