Electrically operated power steering apparatus

Details Electrically operated power steering apparatus Electrically operated power steering apparatus

1995-01-09

1996-01-09

Hurley, Kevin T.

Motor vehicles

Compensating devices

B62D 504

Patent

active

054821290

ABSTRACT:
An electrically operated power steering apparatus has a steering mechanism for steering a motor vehicle, a steering torque sensor for detecting a steering torque produced by the steering mechanism, a vehicle speed sensor for detecting a vehicle speed of the motor vehicle, an electric motor for applying an assistive steering force to the steering mechanism, and a motor current detector for detecting a motor current supplied to the electric motor. A target current to be supplied to energize the electric motor is determined based on a steering torque signal representing the steering torque detected by the steering torque sensor. A controller for controlling the electric motor has a PI control unit having a proportional element and an integral element for controlling the electric motor based on a difference between the determined target current and the motor current detected by the motor current detector, and a coefficient setting unit for varying at least one of coefficients of the proportional element and the integral element based on a vehicle speed signal representing the vehicle speed detected by the vehicle speed sensor.

REFERENCES:
patent: 4538698 (1985-09-01), Hashimoto et al.
patent: 4580648 (1986-04-01), Murakami et al.
patent: 4809173 (1989-02-01), Fukami et al.
patent: 5198981 (1993-03-01), Collier-Hallman et al.
patent: 5404960 (1995-04-01), Wada et al.

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