Electric power steering system

Details Electric power steering system Electric power steering system

1995-06-01

1997-08-19

Chin, Gary

Boots, shoes, and leggings

364424051, 180412, 180422, B62D 504

Patent

active

056594739

ABSTRACT:
An electric power steering system is disclosed which includes an electric motor adapted to supply steering assist directly to the steering system to thereby reduce the steering torque to be exerted to the system by a driver. The steering system includes a phase compensative device which is formed of a phase delay circuit, or the phase delay circuit and a low-pass filter connected in series thereto, and is positioned in a loop connecting a motor current detector in the steering system and a drive controller in a control block, so that high-frequency components may be removed from motor current signals in the feedback loop. As a result, it is possible to suppress lag of the phases of the signals and hence to prevent parasitic oscillations, leading to the steering system being capable of providing steering assist most suited to particular steering operations and comfortable steering feel to a driver.

REFERENCES:
patent: 4800975 (1989-01-01), Oshita et al.
patent: 4961474 (1990-10-01), Daido et al.
patent: 4979114 (1990-12-01), Oshita et al.
patent: 4989682 (1991-02-01), Takahashi et al.
patent: 5201818 (1993-04-01), Nishimoto
patent: 5253725 (1993-10-01), Nishimoto
patent: 5467279 (1995-11-01), Wada et al.
patent: 5469357 (1995-11-01), Nishimoto

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