Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-06-16

1999-11-30

Mai, Lanna

Motor vehicles

Steering gear

With electric power assist

701 41, B62D 504

Patent

active

059925582

ABSTRACT:
Control unit has a plurality of steering assist modes to which are allocated different characteristics of a target motor current for an assisting motor. Engine rotation sensor detects a current number of rotations of a vehicle engine. Mode switching unit effects a change between the steering assist modes only when the detected vehicle velocity is below a predetermined reference velocity representative of a substantially stationary condition of the vehicle and simultaneously the detected number of rotations of the engine is below a predetermined value. Thus, a change in steering characteristic is permitted only when the engine rotation sensor indicates that the vehicle is in the substantially stationary condition. This way, even with a malfunctioning velocity sensor, it is always possible to avoid an unwanted deterioration in driver's steering feel that would be caused by the steering characteristic change.

REFERENCES:
patent: 4718514 (1988-01-01), Hirakushi
patent: 5446660 (1995-08-01), Miichi et al.
patent: 5717590 (1998-02-01), Mihalko

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