Motor vehicles – Compensating devices
Patent
1987-03-19
1988-08-09
Love, John J.
Motor vehicles
Compensating devices
180142, 280707, B62D 504, B60G 1708
Patent
active
047621940
ABSTRACT:
A motor-driven power steering system for a vehicle capable of ensuring the travelling stability of a vehicle during travel on a bad road by avoiding unintentional motion of the steering wheel caused by road surface irregularities. The power steering system includes a motor adapted to be energized by a battery to power assist the steering motion induced by an operator. The power assisting force is transmitted from the motor to the steerable road wheels through a first electromagnetic sliding clutch and a second electromagnetic switching clutch. The operations of the motor and the first and second clutches are controlled by a control unit in such a manner that the force transmitted from the motor to the steerable road wheels is reduced to make the steering operation heavier than when steering with full power assist when the vehicle is travelling on a bad road. The battery condition along with vehicle acceleration and deceleration are also detected by respective sensors to effectively avoid oversteering or to prevent damage to the steering system during acceleration and deceleration or when the battery is insufficiently charged.
REFERENCES:
patent: 4566718 (1986-01-01), Kanai et al.
patent: 4595072 (1986-06-01), Barnea
patent: 4651840 (1987-03-01), Shimizu et al.
Kohge Shinichi
Morishita Mitsuharu
Love John J.
McGiehan Donn
Mitsubishi Denki & Kabushiki Kaisha
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