Electric power steering apparatus
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United States of America Patent
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Jun 16, 2015
Grant Date -
Mar 26, 2015
app pub date -
Apr 24, 2013
filing date -
May 11, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An electric power steering apparatus that is capable of efficiently suppressing vibrations and simultaneously minimizing steering performance degradation such as an increase in a steering wheel's viscous feeling by extracting a vibration component having an arbitrary amplitude and an arbitrary frequency range depending on an electric power steering state parameter and feeding back a vibration suppression compensation value determined depending on the extracted vibration component to a current command value. The apparatus includes a current command value determining section that determines a current command value based on a steering torque and a velocity; a vibration extraction filter that extracts a vibration component having a predetermined amplitude and a predetermined frequency range depending on an electric power steering state parameter; and a compensation value determining section that determines a vibration suppression compensation value based on the vibration component extracted by the vibration extraction filter.
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