Vehicle power steering system

Details Vehicle power steering system Vehicle power steering system

1995-10-24

1998-06-02

Oberleitner, Robert J.

Motor vehicles

Steering gear

With electric power assist

701 41, B62D 504

Patent

active

057587418

ABSTRACT:
A vehicle power steering system for controlling an assist force which supplementally supports the steering operation, includes a motor for producing the assist force, a battery for supplying a current to the motor, a speed sensor for detecting a vehicle speed, a steering-wheel angle sensor for detecting an angle of a steering wheel, a circuit for adjusting the current fed from the battery to the motor according to the vehicle speed detected by the speed sensor and the angle of the steering-wheel detected by the steering-wheel angle sensor, a booster inserted in a current feed path to the motor for boosting a battery voltage of the battery to apply a boosted voltage to the motor. The vehicle power steering system further may include a boosted-voltage stabilizer for controlling the boosted voltage to a predetermined value through an operation of monitoring the boosted voltage. The vehicle power steering system further may include a boosted-voltage decreasing unit for decreasing the boosted voltage according to the drop rate of the battery voltage when the boosted-voltage decreasing unit detects that the boosted voltage is smaller than a first predetermined value through the operation of monitoring the voltage of the battery.

REFERENCES:
patent: 4837690 (1989-06-01), Morishita et al.
patent: 4869334 (1989-09-01), Marumoto et al.
patent: 4875539 (1989-10-01), Abukawa et al.
patent: 4934473 (1990-06-01), Fushimi et al.
patent: 5039926 (1991-08-01), Morishita et al.
patent: 5563790 (1996-10-01), Wada et al.

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