Motor-driven type power assisted steering control apparatus

Details Motor-driven type power assisted steering control apparatus Motor-driven type power assisted steering control apparatus

1989-04-26

1990-08-14

Marmor, Charles A.

Motor vehicles

Compensating devices

180142, 36442405, B62D 504

Patent

active

049479490

ABSTRACT:
A motor-driven power assisted steering control apparatus includes a steering torque sensor 1, a motor 14 connected to a steering shaft via a clutch to exert an auxiliary steering force, and circuitry for controlling the motor in correspondence to an output from the steering torque sensing means. A torque neutral point detector 23 detects the neutral point of the steering torques, and first and second level detecting circuits 27, 29 detect when the motor current exceeds first and higher second levels, respectively. When the motor current exceeds the first level with the steering torque value at other than the neutral point, the clutch current is reduced to cause slippage, and when the motor current exceeds the second level with the steering torque value at other than the neutral point, the clutch current is interrupted to thereby stop the motor.

REFERENCES:
patent: 4300650 (1981-11-01), Weber
patent: 4518055 (1985-05-01), Yogi et al.
patent: 4573545 (1986-03-01), Kains
patent: 4621327 (1986-11-01), Dolph et al.
patent: 4685528 (1987-08-01), Suzuki et al.
patent: 4715463 (1987-12-01), Shimizu
patent: 4736810 (1988-04-01), Morishita et al.
patent: 4809173 (1989-02-01), Fukami et al.
patent: 4837690 (1989-06-01), Morishita et al.
European Search Report 89107561.6 dated Aug. 16, 1989.

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