Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-08-27

2000-09-05

Mai, Lanna

Motor vehicles

Steering gear

With electric power assist

180443, 701 42, 318432, B62D 504

Patent

active

061128465

ABSTRACT:
An electric power steering apparatus includes a proportional plus integral control section incorporated in a control unit for achieving proportional plus integral control action of an offset between a target motor current to be supplied to an electric motor and a motor current actually flowing in the electric motor, and an overshoot diminishing section for controlling at least one of proportional sensitivity and integral gain of the proportional plus integral control section so as to diminish overshoot of the motor current occurring when the steering wheel is quickly turned until it reaches a steering lock position. With this arrangement, semiconductor devices used in the control unit for driving the electric motor are protected against damage caused when subjected to an overload resulting from the overshoot of the motor current.

REFERENCES:
patent: 5481457 (1996-01-01), Yamamoto et al.
patent: 5482129 (1996-01-01), Shimizu
patent: 5732373 (1998-03-01), Endo
patent: 5788010 (1998-08-01), Mukai et al.

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