Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-07-29

1999-07-27

DePumpo, Daniel G.

Motor vehicles

Steering gear

With electric power assist

701 41, B62D 504

Patent

active

059274301

ABSTRACT:
An electric power steering apparatus includes a control unit having a sensor fault detecting section, a first drive control signal generating section, a second drive control signal generating section, and a motor drive control mode switching section. When the sensor fault detecting section does not detect any faulty sensor, operation of an electric motor is feedback-controlled in such a manner that an offset between a target current set in accordance with a steering torque and a motor current becomes zero, and the motor applies a steering assist torque to the steering system on the basis of a first drive control signal supplied from the first drive control signal generating section. When a faulty sensor is detected by the sensor fault detecting section, the motor drive control switching section changes over drive control modes of the motor such that the motor is feedforward-controlled on the basis of a second drive control signal which is generated by the second drive control signal generating section on the basis of a target current signal set in accordance with a steering torque.

REFERENCES:
patent: 4869334 (1989-09-01), Marumoto et al.
patent: 5809438 (1998-09-01), Noro et al.

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