Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-07-10

2000-08-15

DePumpo, Daniel G.

Motor vehicles

Steering gear

With electric power assist

180443, 701 41, 701 42, B62D 404

Patent

active

061021512

ABSTRACT:
Variable gear ratio mechanism variably sets a ratio defining a pivot angle of steered wheels of the vehicle to a steering angle of a steering wheel of the vehicle. Electric motor applies an electric steering assist to the steering system of the vehicle. Steering torque sensor detects steering torque in the steering system. Control unit sets a target motor current on the basis of at least the steering torque detected by the steering torque sensor. Gear ratio detector detects the gear ratio set by the variable gear ratio mechanism. Thus, the control unit sets the target motor current on the basis of the gear ratio detected by the gear ratio detector in addition to the steering torque detected by the steering torque sensor. With this arrangement, the target motor current set by the control unit can reflect the currently-set gear ratio, with the result that the operating characteristics of the vehicle's steering system can be changed smoothly and continuously in response to every gear ratio change and an improved steering feel free of unsmoothness and friction is achieved.

REFERENCES:
patent: 4890683 (1990-01-01), Matsuda et al.
patent: 5265019 (1993-11-01), Harara et al.
patent: 5423391 (1995-06-01), Shimizu
patent: 5887675 (1999-03-01), Hackl et al.
patent: 5996724 (1999-12-01), Shimizu et al.

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