Failure detection device and electric power steering apparatus
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United States of America Patent
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May 17, 2022
Grant Date -
Jun 25, 2020
app pub date -
Mar 3, 2020
filing date -
Oct 2, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
The failure detection device includes: an output unit detecting failure of a torque detection device that detects torque applied to a pinion shaft with torque sensors, and a target current calculation unit controlling drive of the electric motor. In response to detection of failure of one of the torque sensors, the target current calculation unit causes the motor to output continuous torque continuously generating torque that is detectable by the other of the torque sensors and, in response to the motor outputting the continuous torque, the output unit diagnoses failure of the other of the torque sensors based on a pattern of vibrations detected by the other torque sensor due to the continuous torque and determines that the other torque sensor is having failure if amplitude of vibrations is less than a reference amplitude.
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