Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-09-11

2000-03-28

Johnson, Brian L.

Motor vehicles

Steering gear

With electric power assist

180446, 701 41, B62D 504

Patent

active

060418842

ABSTRACT:
An electric power steering apparatus comprises a motor for applying an auxiliary torque to a steering system, a steering torque sensor for detecting a steering torque in the steering system and a control unit for drive-controlling the motor based on at least a steering torque signal from the steering torque sensor. The control unit includes a motor control unit and a failure detecting unit for detecting a failure of the control unit. Based on a failure detection signal from the failure detecting unit, the motor drive control unit switches over from a normal mode in which no failure exists in the apparatus to a first failure mode in which a certain failure exists in the apparatus and an assist ratio is changed to about half of that of the normal mode.

REFERENCES:
patent: 4765425 (1988-08-01), Saito et al.
patent: 4956590 (1990-09-01), Phillips
patent: 4987964 (1991-01-01), Tabuse
patent: 5259473 (1993-11-01), Nishimoto
patent: 5303156 (1994-04-01), Matsuoka et al.
patent: 5485067 (1996-01-01), Nishimoto et al.
patent: 5652487 (1997-07-01), Nishino et al.
patent: 5699874 (1997-12-01), Miyaura
patent: 5927430 (1999-07-01), Mukai et al.

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