Motor-driven power steering system

Details Motor-driven power steering system Motor-driven power steering system

1984-01-16

1985-09-03

Freeh, William L.

Motor vehicles

Compensating devices

180142, 180143, B62D 504

Patent

active

045386986

ABSTRACT:
A power steering system makes use of a direct-current servomotor to produce an auxiliary torque added to the torque which is applied to the steering wheel of a vehicle by the driver. The system includes an electronic apparatus, which receives a signal indicating the velocity of the vehicle, divides the whole range of the vehicle velocity into at least three ranges, and determines under which of these ranges the present velocity falls. In the lowest range, the control apparatus energizes the motor to produce such an auxiliary torque. In the middle range, the apparatus de-energizes the motor and so no auxiliary torque is generated. In the highest range, the apparatus connects a load such as a resistor with the coil in the motor to brake the rotation of the steering wheel.

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