Electric power steering system for vehicles

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

1987-03-26

1989-06-06

Chin, Gary

Boots, shoes, and leggings

180 791, 180142, B62D 506

Patent

active

048376922

ABSTRACT:
An electric power steering system (20) comprises a control device (32) which controls a direct-current motor (49) for operatively providing auxiliary torque to a steering shaft (26) in dependence on steering torque (Ts) acting on the steering shaft. The control device (32) includes a control signal generating circuit (70) which generates a PWM signal (t3, T4, T5) for controlling the motor in dependence on the steering torque, and a motor drive circuit (80) which receives the PWM signal and impresses an on-off voltage to the motor, the drive circuit (80) having a close circuit (49-86-80a, 49-83-80d) in which an electric current (Ia) due to an inductance of the motor flows while the on-off voltage is off. The steering system (20) further comprises a mechanism (76) for detecting a steering speed (Ns) of a steering wheel. The control signal generating circuit (70) generates the PWM signal in dependence, in a positive steering state in which the rotating direction of the steering wheel is coincident with the acting direction of the steering torque, on a first function (125, 126) and, in a steering wheel returning state in which the rotating direction of the steering wheel is not coincident with the acting direction of the steering torque, on a second function (127, 128), having the steering torque and the steering speed as parameters thereof.

REFERENCES:
patent: 4657103 (1987-04-01), Shimizu
patent: 4664211 (1987-05-01), Oshita et al.
patent: 4666011 (1987-05-01), Ohe et al.
patent: 4681181 (1987-07-01), Shimizu
patent: 4688655 (1987-08-01), Shimizu
patent: 4715461 (1987-12-01), Shimizu
patent: 4715463 (1987-12-01), Shimizu
patent: 4726437 (1988-02-01), Norton

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