Electric power steering device

Details Electric power steering device Electric power steering device

1996-01-18

1998-12-01

Ip, Paul

Electricity: motive power systems

Constant motor current, load and/or torque control

318293, 318599, 318430, 180 791, B62D 504

Patent

active

058443878

ABSTRACT:
An electric power steering device for directly applying the power of an electric motor as an auxiliary steering power to a steering system to lower a steering force required of the driver, wherein a current detecting element in a motor current detecting unit is connected in series with the motor, and a drive control unit is operable to always drive, by a PWM signal, that side of switching elements of a bridge circuit to which the motor is connected. With this construction, a high-frequency pulse noise generated upon the PWM driving of the the switching element is absorbed by an inductance in the motor and hence a high-frequency pulse noise detected by the current detecting element can be controlled at an extremely small level. Thus, the electric power steering device can prevent generation of abnormal noises from the motor and oscillation or hunting of the steering system and provide stable steering characteristics.

REFERENCES:
patent: 4719396 (1988-01-01), Shimizu

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