Sensorless backup for motor speed and position
AssigneeGM Global Technology Operations LLC
InventorsMichael Duncan Swartz, Young Joo Lee, Brian J. Gallert, Anno Yoo
Life of this patent
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Abstract
A method and system are contemplated for determining a final speed and position of a motor used in an electric vehicle. The final speed and position is calculated as a function of a sensed position when a resolver of a position system is available and as a function of a sensorless position when the resolver is unavailable.
Claims20
A method for determining a final speed and position of a motor used in an electric vehicle, the method comprising:
- calculating the final speed and position as a function of a sensed position with a resolver when the resolver is available, the sensed position being generated by the resolver responsively to measuring rotation of the motor;
- calculating the final speed and position of the motor as a function of a sensorless position by switching to a sensorless system from the resolver when the resolver is unavailable to provide the sensed position or the sensed position by the resolver is in need of supplementation;
- and
- controlling the motor by implementing a shutdown of the motor when the resolver is unavailable and the senseless system is unavailable.
A system for determining a final speed and position of a motor used in an electric vehicle, the system comprising:
- a resolver configured to determine a sensed position responsively to measuring rotation of the motor;
- a sensorless system configured to calculate a sensorless position responsively to a voltage and a current of the motor;
- and
- a position system configured to operate according to a first mode and a second mode, the first mode calculating the final speed and position as a function of the sensed position, the second mode calculating the final speed and position as a function of the sensorless position, wherein the sensorless system is configured to adjust a measurement of a voltage and a current to the motor to account for a timing offset resulting from a delay obtaining the measurement of the voltage and the current with the sensorless position.
A system for determining a final speed and position of a motor used in an electric vehicle, the system comprising:
- a first observer configured to operate according to execution of a plurality of first instructions stored on a corresponding non-transitory computer readable storage medium, the first instructions being sufficient to:
- calculate the final speed and position as a function of an angle error;
- and
- calculate the angle error as a function of a final position feedback, a final speed feedback, and either one of a sensed position and a sensorless position;
- a second observer configured to operate according to execution of a plurality of second instructions stored on a corresponding non-transitory computer readable storage medium, the second instructions being sufficient to calculate a sensorless angle error as a function of a sensorless speed feedback, a sensorless flux, a sensorless DQ current and a sensorless DQ voltage;
- and
- a third observer configured to operate according to execution of a plurality of third instructions stored on a corresponding non-transitory computer readable storage medium, the third instructions being sufficient to calculate a sensorless speed and the sensorless position as a function of the sensorless angle error and a sensorless speed feedback.
Dependencies are inferred from the claim text.