Electrical power steering apparatus

Details Electrical power steering apparatus Electrical power steering apparatus

1988-03-18

1989-05-30

Mitchell, David M.

Motor vehicles

Compensating devices

180142, B62D 504

Patent

active

048342017

ABSTRACT:
A neutral condition discriminating circuit is connected to a steering torque detector and it discriminates whether a torque detection value of the steering torque detector is in a neutral condition or not, that is, whether it is substantially zero or not. When it is discriminated that the non-neutral condition of the torque detection value continues for a predetermined time, a motor output decreasing circuit decreases a current supplied to a motor which produces a steering assisting torque in accordance with the torque detection value. The hysteresis characteristic of the steering torque detector, which causes the non-neutral condition to occur even when the steering wheel is not steered, can be compensated for by reducing the steering assisting torque produced by the rotor.

REFERENCES:
patent: 4532567 (1985-07-01), Kade
patent: 4556116 (1985-12-01), O'Neil
patent: 4681183 (1987-07-01), Oshita

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