CONTROLLER FOR ELECTRIC VEHICLES

• US 20100114414A1
• Filed: 03/10/2008
• Published: 05/06/2010
• Est. Priority Date: 06/22/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: Sano, Yoshiaki
• Granted Patent: US 8,412,395 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 3/0084 relating to control modules
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: H02P 29/032 Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A controller for electric vehicles is provided for reliably detecting the abnormality of a motor control ECU and also reducing costs. The controller has travel control means 1 for calculating a target driving torque for an electric motor 3 which drives a vehicle 50, and motor control means 2 for calculating a final indication torque which has corrected the target driving torque input from the travel control means 1, and supplying electric power according to the final indication torque to the electric motor 3. The travel control means 1 includes target driving torque calculating means 21 for calculating the target driving torque, final indication torque confirmation value calculating means 23 for calculating a final indication torque confirmation value based on the calculated target driving torque, and abnormality determining means 24 for determining the abnormality of the motor control means 2 based on a result of comparison between the final indication torque and the final indication torque confirmation value.

Claims

1. A controller for an electric vehicle comprising:

travel control means for calculating a target driving torque for an electric motor which drives said vehicle; and

motor control means for calculating a final indication torque which has corrected said target driving torque so that said electric motor can be suitably driven, and supplying electric power according to said final indication torque to said electric motor;

wherein said travel control means comprises

target driving torque calculating means for calculating said target driving torque;

final indication torque confirmation value calculating means for calculating a final indication torque confirmation value based on the calculated target driving torque, as with said motor control means; and

abnormality determining means for determining an abnormality of said motor control means based on a result of comparison between said final indication torque and said final indication torque confirmation value.

2. The controller as set forth in claim 1, wherein said abnormality determining means determines that when a difference between said final indication torque and said final indication torque confirmation value is greater than or equal to a preset value, said motor control means is abnormal.

3. The controller as set forth in claim 1, wherein said final indication torque confirmation value calculating means calculates said final indication torque confirmation value from said target driving torque that was input to said motor control means before a delay time preset based on a communication speed between said travel control means and said motor control means from the present time.

4. The controller as set forth in claim 1, wherein said abnormality determining means stops the determination of the abnormality of the motor control means if a rate of change of said target driving torque is greater than or equal to a predetermined rate of change.

5. The controller as set forth in claim 2, wherein said final indication torque confirmation value calculating means calculates said final indication torque confirmation value from said target driving torque that was input to said motor control means before a delay time preset based on a communication speed between said travel control means and said motor control means from the present time.

6. The controller as set forth in claim 2, wherein said abnormality determining means stops the determination of the abnormality of the motor control means if a rate of change of said target driving torque is greater than or equal to a predetermined rate of change.

7. The controller as set forth in claim 3, wherein said abnormality determining means stops the determination of the abnormality of the motor control means if a rate of change of said target driving torque is greater than or equal to a predetermined rate of change.