Electric power steering device
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United States of America Patent
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Nov 28, 2017
Issued Date -
N/A
app pub date -
Mar 25, 2016
filing date -
Mar 31, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric power steering device includes a steering angle reference yaw rate calculation section that calculates a steering angle reference yaw rate by using a speed of a vehicle and a steering angle of a steering wheel, a torque estimation device that estimates a self-aligning torque (SAT) generated in a turning wheel of the vehicle on the basis of a measured yaw rate or the steering angle reference yaw rate, the absolute value of which is smaller, and the speed of the vehicle, and estimates a required assist torque on the basis of the estimated SAT, and an abnormality determination section that determines whether or not a steering torque sensor is abnormal. If the steering torque sensor is abnormal, an EPS control device controls drive of an assist motor using the required assist torque estimated by the torque estimation device, in place of a steering torque.
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Family
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