Power steering device assisted by variable power

Details Power steering device assisted by variable power Power steering device assisted by variable power

1999-03-29

2000-10-17

Zanelli, Michael J.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

180443, B62D 504

Patent

active

061344907

ABSTRACT:
Steering of a vehicle is assisted by a motor driven according to a steering signal formulated by a digital computer. The steering signal is formulated so that a high and quick power-assist is obtained when the steering is steep or sharp, while trembling vibrations appearing on a steering wheel due to noise are suppressed when the steering is slow or the steering wheel is stably held. A steering velocity calculated from a steering angle and a steering torque signal detected from a torsional torque of a steering shaft are used to formulate the steering signal. An original steering torque signal is modified by a transfer function having a higher gain and a higher phase advance in a certain frequency range thereof, thereby formulating a final steering signal which controls operation of the power-assist motor.

REFERENCES:
patent: 5040629 (1991-08-01), Matsuoka et al.
patent: 5631529 (1997-05-01), Shimizu et al.
patent: 5698956 (1997-12-01), Nishino et al.
patent: 5699249 (1997-12-01), Noro et al.

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