Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1994-07-01

1996-01-16

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

318432, 318434, G05B 500

Patent

active

054850673

ABSTRACT:
An electric power steering apparatus which is provided with a CPU for outputting a drive control signal of an electric motor for assisting the steering force on the basis of the detected steering torque, and a drive inhibition circuit for outputting a signal to stop the operation of the electric motor when the direction of the electric motor operation and the direction of the detected steering torque are opposite to each other, the output of the drive inhibition circuit is inputted to the CPU, which monitors the normal or abnormal condition of the drive inhibition circuit. While the abnormal condition of the CPU continues for a predetermined time period, the drive stop condition of the electric motor is kept. When the detected torque is not smaller than the predetermined value, the drive of the electric motor in the direction opposite to that of the detected torque is inhibited.

REFERENCES:
patent: 4629952 (1986-12-01), Shimizu
patent: 4881611 (1989-11-01), Nakashima et al.
patent: 4896735 (1990-06-01), Morishita et al.
patent: 4957182 (1990-09-01), Morishita et al.
patent: 4971173 (1990-11-01), Takahashi
patent: 4984647 (1991-01-01), Morishita et al.
patent: 5029466 (1991-07-01), Nishihara et al.
patent: 5202830 (1993-04-01), Tsurumiya et al.
patent: 5335979 (1994-08-01), Naitou et al.

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