Motor vehicles – Steering gear – With electric power assist
Patent
1998-05-01
2000-02-29
Dickson, Paul N.
Motor vehicles
Steering gear
With electric power assist
701 41, B62D 504
Patent
active
060297670
ABSTRACT:
When a motor terminal voltage detector circuit fails, it is impossible to calculate a motor angular speed estimate, so a current is supplied to a steering-assist motor regardless of a driver's steering state, thus leading to abnormality in control of the steering force due to an electric power steering system. According to a first motor target current which is determined on the basis of a detected driver's steering force value and a second motor target current which is determined on the basis of a counter electromotive voltage across the motor, a third motor target current to be supplied to the motor is determined, and also an upper limit is set for the second or third target current. Also, failure of circuits necessary for calculating a counter electromotive voltage across the motor is detected.
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Dickson Paul N.
Mitsubishi Denki & Kabushiki Kaisha
Yeagley Daniel
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