Motor control system and vehicle

Patent metadata

Field	Value
Publication number	US-12545114-B2
Application number	US-202217896853-A
Country	US
Kind code	B2
Filing date	Aug 26, 2022
Priority date	Feb 26, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A motor control system and a vehicle. The motor control system includes: a vehicle control unit, configured to obtain vehicle state data and output an instruction for cutting off motor output torque when determining an unexpected power transmission failure according to the vehicle state data; and a motor controller unit, connected to the vehicle control unit, and configured to stop outputting motor control torque in response to the instruction for cutting off motor output torque.

First claim

What is claimed is:

1 . A motor control system, comprising:
a vehicle controller, configured to obtain vehicle state data and output an instruction for cutting off motor output torque when determining an unexpected power output abnormality of a vehicle according to the vehicle state data; and a motor controller, that is separate from and connected to the vehicle controller by one of a hard wire and a CAN bus, and configured to control a motor to stop outputting torque in response to the instruction for cutting off motor output torque; wherein the motor controller comprises a main control chip, a power supply chip, and a driving chip; wherein the driving chip comprises a primary-side low voltage side and a secondary-side high voltage side; wherein at least the primary-side low voltage side is configured to receive the instruction for cutting off motor output torque from the vehicle controller and to stop the motor from outputting torque based on the instruction; wherein the one of the hard wire and the CAN bus defines a feedback channel between the vehicle controller and the main control chip; and wherein the vehicle controller sends the instruction for cutting off motor output torque to the main control chip, the main control chip feeds back the received instruction for cutting off motor output torque to the vehicle controller through the feedback channel, and the vehicle controller determines correctness of sent information according to the instruction for cutting off motor output torque fed back by the main control chip.

2 . The motor control system according to claim 1 , wherein
the main control chip is configured to obtain motor state data and output an enable cut-off signal when determining that motor operation is abnormal according to the motor state data; and the driving chip is configured to control the motor to stop outputting torque when receiving any of the enable cut-off signal or the instruction for cutting off motor output torque.

3 . The motor control system according to claim 2 , wherein
the power supply chip is configured to monitor a state of the main control chip and output a safe cut-off signal when the main control chip or the power supply chip is abnormal, the safe cut-off signal from the power supply chip and the enable cut-off signal from the main control chip are transmitted to the primary-side low voltage side of the driving chip, and the driving chip controls the motor to stop outputting torque when receiving any of the instruction for cutting off motor output torque, the safe cut-off signal, or the enable cut-off signal.

4 . The motor control system according to claim 1 , wherein two groups of driving chips are provided, each group of driving chips comprises three driving controllers, the three driving controllers of one group of driving chips are configured to control three power modules of an upper bridge arm, and the three driving controllers of another group of driving chips are configured to control three power modules of a lower bridge arm.

5 . The motor control system according to claim 4 , wherein
one group of driving chips is powered by a first power supply source, and another group of driving chips is powered by a second power supply source; or the two groups of driving chips are powered by the same power supply source.

6 . The motor control system according to claim 1 , wherein the instruction for cutting off motor output torque transmitted by the vehicle controller is a redundant signal and the same level signals are used, or the instruction for cutting off motor output torque transmitted by the vehicle controller is a bistable signal and opposite level signals are used.

7 . A vehicle, comprising a motor and the motor control system according to claim 1 , wherein the motor control system is configured to control the motor.

8 . The motor control system according to claim 1 , wherein the secondary-side high voltage side is configured to receive the instruction for cutting off motor output torque from the vehicle controller and to stop the motor from outputting torque based on the instruction.

9 . The motor control system according to claim 8 , wherein the main control chip is configured to obtain motor state data and output an enable cut-off signal when determining that motor operation is abnormal according to the motor state data; and
the driving chip is configured to control the motor to stop outputting torque when receiving any of the enable cut-off signal or the instruction for cutting off motor output torque.

10 . The motor control system according to claim 9 , wherein
the power supply chip is configured to monitor a state of the main control chip and output a safe cut-off signal when the main control chip or the power supply chip is abnormal, the safe cut-off signal from the power supply chip and the enable cut-off signal from the main control chip are transmitted to the primary-side low voltage side of the driving chip, and the driving chip controls the motor to stop outputting torque when receiving any of the instruction for cutting off motor output torque, the safe cut-off signal, or the enable cut-off signal.

11 . The motor control system according to claim 10 , wherein two groups of driving chips are provided, each group of driving chips comprises three driving chip portions, the three driving chip portions of one group of driving chips are configured to control three power modules of an upper bridge arm, and the three driving chip portions of another group of driving chips are configured to control three power modules of a lower bridge arm.

12 . The motor control system according to claim 11 , wherein
one group of driving chips is powered by a first power supply source, and another group of driving chips is powered by a second power supply source; or the two groups of driving chips are powered by the same power supply source.

13 . The motor control system according to claim 12 , wherein the instruction for cutting off motor output torque transmitted by the vehicle controller is a redundant signal and the same level signals are used, or the instruction for cutting off motor output torque transmitted by the vehicle controller is a bistable signal and opposite level signals are used.

14 . The motor control system according to claim 1 , wherein the one of the hard wire and the CAN bus is a CAN bus.

15 . A motor control system, comprising:
a vehicle control unit, configured to obtain vehicle state data and output an instruction for cutting off motor output torque when determining an unexpected power output abnormality of a vehicle according to the vehicle state data; and a motor controller unit, that is separate from and connected to the vehicle control unit by one of a hard wire and a CAN bus, and configured to control a motor to stop outputting torque in response to the instruction for cutting off motor output torque; wherein the motor controller unit comprises a main control unit, a power supply unit, and a driving unit; wherein the driving unit comprises a primary-side low voltage side; wherein at least the primary-side low voltage side is configured to receive the instruction for cutting off motor output torque from the vehicle controller and to stop the motor from outputting torque based on the instruction; wherein the one of the hard wire and the CAN bus defines a feedback channel between the vehicle control unit and the main control unit; and wherein the vehicle control unit sends the instruction for cutting off motor output torque to the main control unit, the main control unit feeds back the received instruct

Assignees

• Byd Co Ltd

Inventors

• Xu Luhui
• Yu Yilong
• Du Zhiyong
• Qi Axi
• Yang Guangming

Classifications

• H02P6/08

  Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence) · CPC title

• H02H7/0833

  for electric motors with control arrangements · CPC title

• B60L2240/423

  Torque · CPC title

• B60L15/20 Primary

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title