Electric power steering system
First Claim
1. An electric power steering system operative to decide a target current value of an electric motor according to an operation of a steering member and to provide steering assist by applying a power of the motor to a steering mechanism, comprising:
- torque-ripple compensation decision means which uses rotational position information on the electric motor and the decided target current value to thereby decide a compensation value for current high-order-component for canceling torque ripple caused by predetermined high-order components of the current flowing through the motor;
correction means for correcting the decided target current value by using the compensation value supplied from the torque-ripple compensation decision means; and
feedback control means for providing feedback control of the electric motor based on the target current value corrected by the correction means.
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Accused Products
Abstract
There are provided a high-order current distortion compensator which uses rotational position information on an electric motor and a target current value of the electric motor for deciding a compensation value for current high-order-component for canceling torque ripple caused by predetermined high-order components of a current flowing through the motor, and a correction portion which corrects the target current value by using the compensation value supplied from the high-order current distortion compensator. A feedback controller provides feedback control of the electric motor based on the target current value corrected by the correction portion. Thus is suppressed the torque ripple caused by the predetermined high-order components, whereby the degradation of steering feeling is reduced.
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Citations
5 Claims
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1. An electric power steering system operative to decide a target current value of an electric motor according to an operation of a steering member and to provide steering assist by applying a power of the motor to a steering mechanism, comprising:
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torque-ripple compensation decision means which uses rotational position information on the electric motor and the decided target current value to thereby decide a compensation value for current high-order-component for canceling torque ripple caused by predetermined high-order components of the current flowing through the motor;
correction means for correcting the decided target current value by using the compensation value supplied from the torque-ripple compensation decision means; and
feedback control means for providing feedback control of the electric motor based on the target current value corrected by the correction means. - View Dependent Claims (2, 3, 4, 5)
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Specification