US 2016/0107680 A1 · ELECTRIC POWER STEERING CONTROL UNIT

Abstract

[Problem] An object of the present invention is to provide an electric power steering control unit that detects the vibration components of the vibration compressing object such as the handle and current command value based on an expression of Fourier series of which calculation capacity is small, changes a gain of the PI control section at only a time when the vibration of the predetermined frequency continues during the predetermined time or more and compresses the vibration, and improves the steering feeling. [Means for Solving the Problem] The present invention comprises a vibration detecting section to detect a vibration of a vibration compressing object and outputs a vibration signal; a continuation-time judging section to output a continuation signal when the vibration signal continues equal to or more than a predetermined time; and a gain setting section to change a gain of the PI-control based on the continuation signal; wherein a vibration compressing of the vibration compressing object is performed in a continuation of a predetermined frequency of the vibration signal and being equal to or more than the predetermined time.

Claims14

Dependent claims

1-7. (canceled)

An electric power steering control unit that PI-controls a current command value calculated based on at least a steering torque, and drive-controls a motor by means of a control command value which is PI-controlled and assist-controls a steering, comprising:

a vibration detecting section to detect a vibration of a vibration compressing object and outputs a vibration signal;
a continuation-time judging section to output a continuation signal, by passing through a first condition judging whether an output value of said vibration signal is relatively within a certain scope or not, and by judging a second condition whether a signal passed said first condition is equal to or more than a predetermined threshold or not;
and
a gain setting section to change a gain of said PI-control based on said continuation signal;
wherein said vibration compressing object is said steering torque, said current command value and a motor speed of said motor, and a vibration compressing of said vibration compressing object is performed in a falling direction by changing said gain at continuations of a predetermined frequency of said vibration signal and of a time passed said first condition and said second condition.

2 more elements

Dependencies are inferred from the claim text.

Electric power steering control unit

Life of this patent

Electric power steering control unit

Life of this patent

Abstract

Claims14