Motor control apparatus for electric power steering system

Details Motor control apparatus for electric power steering system Motor control apparatus for electric power steering system

1989-04-20

1990-12-18

Chin, Gary

Boots, shoes, and leggings

180 791, 180142, B62D 504

Patent

active

049791141

ABSTRACT:
A motor control apparatus for an electric power steering system of a vehicle is provided. The apparatus includes a torsion torque sensor for detecting a torsion torque of the steering system, a vehicle speed sensor, a steering angle sensor, a control unit for controlling the rotational direction and torque of an electric motor in accordance with a command signal derived from the outputs from the torque sensor, vehicle speed sensor and steering angle sensor, and a neutral position recovery command unit for generating a recovery signal in response to which the steering system is returned to a neutral position, in accordance with an output signal from the steering angle sensor and when the absolute values of the output signals from the torsion torque sensor and vehicle speed sensor becomes smaller than or equal to predetermined values. The neutral position recovery command unit operates such that the recovery signal functions to make a recovery steering angle speed gradually decreases toward 0 as the steering system is returned to the neutral position while following a predetermined target steering speed. The neutral position recovery command unit also operates such that the recovery signal functions to gradually move the recovery target value toward 0.

REFERENCES:
patent: 4730686 (1988-03-01), Shimizu
patent: 4800975 (1989-01-01), Oshita et al.
patent: 4842088 (1989-06-01), Oshita et al.
patent: 4875540 (1989-10-01), Oshita et al.

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