Electric power steering system and method for processing fail-safe of electronic control unit
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United States of America Patent
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Dec 6, 2016
Grant Date -
Dec 31, 2015
app pub date -
Jun 25, 2015
filing date -
Jun 25, 2014
priority date (Note) -
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Abstract
An electric power steering system including: a torque sensor; a steering angle sensor configured to detect a steering angle value of a steering wheel; a motor position sensor configured to detect a motor rotation angle value which is a rotated angle of a driving shaft of an electric motor; and an electronic control unit configured, when the torque sensor is normal, to generate a first steering assist current for controlling a driving force of the electric motor using the steering torque value, and when the torque sensor fails, to estimate a target motor angular velocity of the electric motor using the steering angle value and the motor rotation angle value and to generate a second steering assist current so as to cause a current motor angular velocity of the electric motor to converge to the target motor angular velocity.
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