Steering controller
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United States of America Patent
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May 7, 2013
Grant Date -
Nov 11, 2010
app pub date -
Jan 30, 2008
filing date -
Jan 30, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
To accurately extract a pulsating component generated due to a cogging torque or a torque ripple to reduce a pulsation, the pulsating component is extracted using a bandpass filter having a variable time constant, and the time constant is set according to a frequency of cogging torque or torque ripple to be extracted. Further, a reference angle for a rotation angle of a motor is preset according to a generation harmonic order of the cogging torque or torque ripple, and the time constant of the bandpass filter is set from a time period required for the motor to rotate by the reference angle.
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