Electric motor drive-type power steering system

Details Electric motor drive-type power steering system Electric motor drive-type power steering system

1993-01-29

1994-07-12

Focarino, Margaret A.

Motor vehicles

Compensating devices

180143, 74661, B62D 504

Patent

active

053279867

ABSTRACT:
An electric motor drive-type power steering system includes a steering gear, a first motor constantly connected to the steering gear for supplying thereto a steering assist force, and a second motor connectable to the steering gear by way of an electromagnetic clutch for selectively supplying a steering assist force to the steering gear in addition to the steering assist force by the first motor. The first and second motors and the electromagnetic clutch are controlled so that both of the first and second motors are put into action when the vehicle speed is lower than a predetermined value and only the first motor is put into action when the vehicle speed is higher than the above mentioned predetermined value. The first motor is of a smaller maximum output type as compared with the second motor.

REFERENCES:
patent: 4484871 (1984-11-01), Adman
patent: 4577738 (1986-03-01), Yater
patent: 4686433 (1987-08-01), Shimizu
patent: 5040630 (1991-08-01), Morishita et al.
patent: 5195623 (1993-03-01), Sommers

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