Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2011-03-22

2011-03-22

Winner, Tony H. (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

Reexamination Certificate

active

07909131

ABSTRACT:
A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating the state of a steering system, a frequency component corresponding to a vibration that increases generation of a rattling noise in a speed reducing mechanism. The extracting section outputs an effective value of the extracted frequency component as a power spectrum. If the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer outputs a motor control signal to reduce the assist force generated by the EPS actuator.

REFERENCES:
patent: 5844387 (1998-12-01), Mukai et al.
patent: 2005/0027417 (2005-02-01), Sawada et al.
patent: 2009/0000857 (2009-01-01), Sugiyama et al.
patent: 10 2005 051 442 (2007-05-01), None
patent: 1 502 837 (2005-02-01), None
patent: 2004-291718 (2004-10-01), None
patent: 2006-335228 (2006-12-01), None

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