Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1990-06-04

1991-01-15

Bertsch, Richard A.

Motor vehicles

Compensating devices

36442405, B62D 504

Patent

active

049846477

ABSTRACT:
An electric power steering apparatus for an automotive vehicle has an interrupter which cuts off the power to a drive motor when a dangerous situation is detected. In one form of the invention, the interrupter cuts off power to the drive motor when a ground fault sensor detects a ground fault of a motor driver and there is disagreement between a directional drive signal to the drive motor and the direction of torque applied to the steering wheel by the driver. In another form of the invention, the interrupter circuit cuts off power when the vehicle speed exceeds a prescribed level and the torque applied to the steering wheel exceeds a prescribed level for a certain length of time. In a third form of the invention, the interrupter cuts off power when the motor current exceeds a prescribed level and disagreement of directional signals is detected.

REFERENCES:
patent: 4666011 (1987-05-01), Ohe et al.
patent: 4809173 (1989-02-01), Fukami et al.
patent: 4819170 (1989-04-01), Shmizu
patent: 4869334 (1989-09-01), Marumoto et al.
patent: 4893688 (1990-01-01), Morishita
patent: 4903208 (1990-02-01), Murai et al.
patent: 4913249 (1990-04-01), Lang

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