B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
342/32, 341/79
B62D 5/04 (2006.01)
Patent
CA 1282144
ABSTRACT OF THE DISCLOSURE 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.
532678
Shimizu Yasuo
Honda Giken Kogyo Kabushiki Kaisha (also Trading As Honda Motor Ltd .)
Johnson Douglas S. Q.c.
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