Electric power steering system for vehicles

Details Electric power steering system for vehicles Electric power steering system for vehicles

1986-07-31

1987-08-25

Love, John J.

Motor vehicles

Compensating devices

B62D 504

Patent

active

046886559

ABSTRACT:
An electric power steering system (50) for vehicles has an electromagnetic servo device (1) including a drive control circuit (30, 40) for feeding a motor drive signal (Va) to an electric motor (14) for producing auxiliary torque to be supplied to an output shaft (6) in accordance with a steering torque signal (S.sub.1, S.sub.2) from a steering torque detection mechanism (32) which detects steering torque (Ts) acting on an input shaft (5) and a steering speed signal (S.sub.3, S.sub.4) from a steering speed detection mechanism (36) which detects a steering speed (Ns) of a steering wheel. The drive control circuit is adapted to determine, in dependence on the steering speed signal, a component (D(K.Nm)) of the motor drive signal that corresponds to the steering speed and to judge, in accordance with the steering torque signal and the steering speed signal, in which of a positive steering state and a steering wheel returning state the system is put. In the case the steering system is in the positive steering state, the motor drive signal has a magnitude determined as the sum of the steering speed component and a first provisional component (D(Ts)) preset for the positive steering state. In the case the steering system is in the steering wheel returning state, the magnitude of the motor drive signal is determined as the sum of the steering speed component and a second provisional component (D'(Ts)) preset for the steering wheel returning state.

REFERENCES:
patent: 3944014 (1976-03-01), Maisch et al.
patent: 4527653 (1985-07-01), Agarwal et al.
patent: 4561515 (1985-12-01), Hashimoto et al.
patent: 4573545 (1986-03-01), Kalns
patent: 4580649 (1986-04-01), Ohe et al.

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