Motor control system and vehicle

12107,411

17/943878

September 13, 2022

A motor control system includes a main control unit, a power supply unit, and a driving unit. The main control unit obtains sampling data of a motor and a power supply signal from the driving unit, generates a motor control signal according to the sampling data, and outputs a safety enable signal when determining that motor drive is abnormal according to the sampling data or when determining that power supply to the driving unit is abnormal according to the power supply signal. The power supply unit supplies power to the main control unit, monitors a state of the main control unit, and outputs a safety cut-off signal when the power supply unit or the main control unit is abnormal. The driving unit drives the motor according to the motor control signal, and switches to a safe path when receiving any one of the safety enable or safety cut-off signal.

BYD COMPANY LIMITED (Guangdong, CN)

BYD COMPANY LIMITED (Shenzhen, CN)

1. A motor control system, comprising a main control unit, a power supply unit, and a driving unit, wherein the main control unit is configured to: obtain sampling data of a motor and a power supply signal from the driving unit, generate a motor control signal according to the sampling data, and output a safety enable signal when determining that motor drive is abnormal according to the sampling data or when determining that power supply to the driving unit is abnormal according to the power supply signal; the power supply unit is configured to: supply power to the main control unit, monitor a state of the main control unit, and output a safety cut-off signal when the power supply unit or the main control unit is abnormal; and the driving unit is configured to: drive the motor according to the motor control signal, and switch to a safe path when receiving any one of the safety enable signal or the safety cut-off signal; wherein the main control unit comprises a plurality of control subunits, the plurality of control subunits comprising: a main function subunit configured to obtain the sampling data of the motor and generate the motor control signal according to the sampling data of the motor; a monitoring subunit configured to perform information diagnosis, generate diagnostic information, obtain process data of the main function subunit to monitor a state of the main function subunit, generate a motor safety control signal according to the diagnostic information, enable or disable control information, and control information enabling the motor to be in a safe state; and a first co-processing subunit configured to determine a motor drive state according to the sampling data and output a final motor control signal according to the motor control signal output by the main function subunit, the motor safety control signal output by the monitoring subunit, and the motor drive state.

2. The motor control system according to claim 1 , wherein the sampling data comprises at least one of a motor rotation speed or a bus voltage, and the main control unit controls the driving unit to switch to the safe path according to the sampling data when the motor drive is abnormal, wherein when an absolute value of a difference between the motor rotation speed and a preset rotation speed is less than a set rotation speed difference, or when an absolute value of a difference between the bus voltage and a preset voltage is less than a set voltage difference, all six driving power units of the driving unit are controlled to be turned off.

3. The motor control system according to claim 2 , wherein the main control unit controls all the six driving power units of the driving unit to be turned off when the power supply to the driving unit is abnormal, and the power supply unit controls all the six driving power units of the driving unit to be turned off when the power supply unit or the main control unit is abnormal.

4. The motor control system according to claim 3 , wherein the plurality of control subunits are a plurality of control cores or a plurality of processing chips.

5. The motor control system according to claim 4 , wherein the sampling data comprises motor angle data, and the plurality of control subunits further comprise a second co-processing subunit, wherein the second co-processing subunit is configured to perform resolver decoding on the motor angle data to obtain an angle required for controlling the motor.

6. The motor control system according to claim 1 , wherein the main control unit controls all the six driving power units of the driving unit to be turned off when the power supply to the driving unit is abnormal, and the power supply unit controls all the six driving power units of the driving unit to be turned off when the power supply unit or the main control unit is abnormal.

7. The motor control system according to claim 1 , wherein the plurality of control subunits are a plurality of control cores or a plurality of processing chips.

8. The motor control system according to claim 7 wherein the sampling data comprises motor angle data, and the plurality of control subunits further comprise a second co-processing subunit, wherein the second co-processing subunit is configured to perform resolver decoding on the motor angle data to obtain an angle required for controlling the motor.

9. The motor control system according to claim 8 , wherein the first co-processing subunit comprises: a quick protection module, configured to determine the motor drive state according to the sampling data; and a control signal processing module, configured to: when the motor drive is normal, use the motor control signal from the main function subunit as the final motor control signal, and control the motor to operate according to the motor control signal from the main function subunit; or, when the motor drive is abnormal, use the motor safety control signal from the monitoring subunit as the final motor control signal, and control the driving unit to switch to the safe path according to the sampling data.

10. The motor control system according to claim 1 , wherein the motor control system comprises two driving power supplies, and the two driving power supplies supply power to a three-phase upper bridge arm circuit and a three-phase lower bridge arm circuit of the driving unit respectively; or the motor control system comprises six driving power supplies, and the six driving power supplies supply power to the six driving power units of the three-phase upper bridge arm circuit and the three-phase lower bridge arm circuit of the driving unit respectively.

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

12. The motor control system according to claim 1 , wherein the first co-processing subunit comprises: a quick protection module, configured to determine the motor drive state according to the sampling data; and a control signal processing module, configured to: when the motor drive is normal, use the motor control signal from the main function subunit as the final motor control signal, and control the motor to operate according to the motor control signal from the main function subunit; or, when the motor drive is abnormal, use the motor safety control signal from the monitoring subunit as the final motor control signal, and control the driving unit to switch to the safe path according to the sampling data.

13. The motor control system according to claim 12 , wherein the motor control system comprises two driving power supplies, and the two driving power supplies supply power to a three-phase upper bridge arm circuit and a three-phase lower bridge arm circuit of the driving unit respectively; or the motor control system comprises six driving power supplies, and the six driving power supplies supply power to the six driving power units of the three-phase upper bridge arm circuit and the three-phase lower bridge arm circuit of the driving unit respectively.

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