Electric power steering system

Details Electric power steering system Electric power steering system

1995-12-08

1997-09-16

Culbreth, Eric D.

Motor vehicles

With means for promoting safety of vehicle, its occupant or...

Responsive to absence or inattention of operator, or...

180169, 180446, 342 71, 340904, 340435, B60R 2100, B62D 504

Patent

active

056670338

ABSTRACT:
An electric power steering system of this invention can inform the driver of potential danger by providing control by way of safety precaution before a vehicle enters a dangerous situation. The occurrence of dangerous situations is determined based on a signal from an obstacle sensor. If a steering wheel is turned in a dangerous situation, a warning control is performed on a motor. The motor outputs a torque for t1 seconds, for example, which counters against turning of the steering wheel. Then, the motor enters a "non-assist" state wherein no current is applied thereto for t2 seconds. If an intermittent counter torque is applied by the motor, it is hard to turn the steering wheel and the steering wheel is caused to vibrate, thereby preventing the vehicle from being steered to collide with an obstacle and, warning the driver of the danger with vibration caused in the steering wheel.

REFERENCES:
patent: 4766421 (1988-08-01), Beggs et al.
patent: 5040630 (1991-08-01), Morishita et al.
patent: 5302956 (1994-04-01), Asbury et al.
patent: 5339075 (1994-08-01), Abst et al.
patent: 5428439 (1995-06-01), Parker et al.

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