Motor angle detection and diagnosis apparatus, motor controller, electric vehicle, and method

A motor controller, comprising:

• an inverter circuit including an input end and an output end, the input end of the inverter circuit being connected to a power battery, and an output end of the inverter circuit being connected to a drive motor, the inverter circuit is configured to convert a high-voltage direct current output from the power battery into an alternating current to enable the drive motor to work;
• a motor angle detection and diagnosis apparatus, the motor angle detection and diagnosis apparatus enables angle sampling to reach at least an automotive safety integrity level (ASIL) C function safety goal, the motor angle detection and diagnosis apparatus comprising:
• a signal generation module configured to generate an exciting modulation signal, the exciting modulation signal is generated by comparing an exciting fundamental wave signal with a carrier signal;
• a resolver exciting processing circuit connected between the signal generation module and a resolver, the resolver exciting processing circuit configured to filter and amplify the exciting modulation signal to obtain an exciting signal, to drive the resolver to work;
• a resolver feedback processing circuit connected to the resolver and receiving a resolver feedback signal of an electrical angle of the drive motor, the resolver feedback processing circuit configured to adjust the resolver feedback signal and generate a resolver feedback signal output;
• an angle sampling and diagnosis system configured to:
• perform two-channel simultaneous sampling on the resolver feedback signal output obtained after the adjustment by the resolver feedback processing circuit;
• separately calculate a first electrical angle and a second electrical angle, the first electrical angle being used for torque control and the second electrical angle being used for torque monitoring;
• diagnose data obtained after the two-channel sampling of the first electrical angle and the second electrical angle in real time;
• and
• control the motor controller to enter a safe state when diagnosing an abnormality;
• a diagnosis signal sampling circuit connected to the resolver exciting processing circuit and to the resolver feedback processing circuit, the diagnosis signal sampling circuit configured to collect the exciting signal and the resolver feedback signal obtained after the adjustment by the resolver feedback processing circuit, to generate a feedback signal;
• and
• a first diagnosis module connected to the diagnosis signal sampling circuit, the first diagnosis module configured to:
• diagnose an exciting generation loop and a resolver feedback sampling loop based on the feedback signal;
• and
• control the motor controller to enter the safe state when diagnosing a fault.

An electric vehicle, comprising:

• a motor controller, the motor controller comprising an inverter circuit including an input end and an output end, the input end of the inverter circuit being connected to a power battery and the output end of the inverter circuit being connected to a drive motor, the inverter circuit is configured to convert a high-voltage direct current output from the power battery into an alternating current to enable the drive motor to work;
• from a motor angle detection and diagnosis apparatus, the motor angle detection and diagnosis apparatus enables angle sampling to reach at least an automotive safety integrity level (ASIL) C function safety goal, the motor angle detection and diagnosis apparatus comprising:
• a signal generation module configured to generate an exciting modulation signal, the exciting modulation signal is generated by comparing an exciting fundamental wave signal with a carrier signal;
• a resolver exciting processing circuit connected between the signal generation module and a resolver, the resolver exciting processing circuit configured to filter and amplify the exciting modulation signal to obtain an exciting signal, to drive the resolver to work;
• a resolver feedback processing circuit connected to the resolver and receiving a resolver feedback signal of an electrical angle of the drive motor, the resolver feedback processing circuit configured to adjust the resolver feedback signal and generate a resolver feedback signal output;
• an angle sampling and diagnosis system configured to:
• perform two-channel simultaneous sampling on the resolver feedback signal output obtained after the adjustment by the resolver feedback processing circuit;
• separately calculate a first electrical angle and a second electrical angle, the first electrical angle being used for torque control and the second electrical angle being used for torque monitoring;
• diagnose data obtained after the two-channel sampling of the first electrical angle and the second electrical angle in real time;
• and
• control the motor controller to enter a safe state when diagnosing an abnormality;
• a diagnosis signal sampling circuit connected to the resolver exciting processing circuit and to the resolver feedback processing circuit, the diagnosis signal sampling circuit configured to collect the exciting signal and the resolver feedback signal obtained after the adjustment by the resolver feedback processing circuit, to generate a feedback signal;
• and
• a first diagnosis module connected to the diagnosis signal sampling circuit, the first diagnosis module configured to:
• diagnose an exciting generation loop and a resolver feedback sampling loop based on the feedback signal;
• and
• control the motor controller to enter the safe state when diagnosing a fault.

A motor angle detection and diagnosis method for a motor controller to enable angle sampling to reach at least an automotive safety integrity level (ASIL) C function safety goal, the motor angle detection and diagnosis method comprising:

• generating an exciting modulation signal by comparing an exciting fundamental wave signal with a carrier signal;
• filtering and amplifying the exciting modulation signal to obtain an exciting signal, to drive the resolver to work;
• adjusting the resolver feedback signal and generating a resolver feedback signal output;
• performing two-channel simultaneous sampling on the resolver feedback signal output obtained after the adjustment by the resolver feedback processing circuit;
• separately calculating a first electrical angle and a second electrical angle;
• diagnosing data obtained after the two-channel sampling of the first electrical angle and the second electrical angle in real time, the first electrical angle being used for torque control and the second electrical angle being used for torque monitoring;
• sampling the exciting signal and the adjusted resolver feedback signal to generate a feedback signal, and diagnosing an exciting generation loop and a resolver feedback sampling loop based on the feedback signal;
• and
• controlling the motor controller to enter a safe state when diagnosing a fault.