Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1995-11-21

1998-06-16

Johnson, Brian L.

Motor vehicles

Steering gear

With electric power assist

701 41, B62D 504

Patent

active

057656614

ABSTRACT:
In an electric power steering apparatus, a control unit is divided into two units. A first control unit which determines a first motor current target value is constructed only by hardware. A second control unit includes a fail-safe unit not required to respond quickly. The second control unit determines a second motor current target value, and outputs, to the first control unit, a signal for changing the first motor current target value on the basis of the first motor current target value, the second motor current target value, a driving current, and a signal indicative of a condition of a vehicle. By sharing of roles in this way, it is possible to enhance the responsivity of the apparatus to a steering operation and to realize the reduction in production costs.

REFERENCES:
patent: 4621327 (1986-11-01), Dolph et al.
patent: 4660671 (1987-04-01), Behr et al.
patent: 4869334 (1989-09-01), Marumoto et al.
patent: 4959787 (1990-09-01), Morishita et al.
patent: 5253725 (1993-10-01), Nishimoto
patent: 5271474 (1993-12-01), Nishimoto
patent: 5355315 (1994-10-01), Daido et al.
patent: 5361210 (1994-11-01), Fu
patent: 5480000 (1996-01-01), Daido et al.

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