Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-05-08

2000-01-18

Hurley, Kevin

Motor vehicles

Steering gear

With electric power assist

701 42, B62D 504

Patent

active

060150238

ABSTRACT:
An electric power steering apparatus includes a control unit for controlling a steering assist from an electric motor in accordance with steering torque detected by a torque detector. The control unit includes a plurality of assist mode generators to which are allocated different characteristics of target current to provide different steering characteristics, and any one of the assist mode generators can be switchably selected depending on a predetermined condition. All of the assist mode generators are set in such a manner that the respective allocated characteristics of target current become substantially uniform in a high-velocity driving condition. Thus, the steering characteristics are kept constant even when an assist mode change is effected during high-velocity running of the automotive vehicle, so that it is possible to effectively avoid a decline in the driver's steering feeling and adverse effects on the behavior of the automotive vehicle that would be caused by the assist mode change during the high-velocity running.

REFERENCES:
patent: 4702335 (1987-10-01), Cage et al.
patent: 4954957 (1990-09-01), Kawagoe et al.

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