Motor vehicles – Compensating devices
Patent
1993-08-30
1995-01-17
Hill, Mitchell J.
Motor vehicles
Compensating devices
192 431, 192 46, 192 71, B62D 504
Patent
active
053818695
ABSTRACT:
A power steering system for vehicles is disclosed using a stepping motor. The stepping motor is energized for power assist in executing turns and for reducing drag of the servomotor during the return of the dirigible wheels to the straight ahead position. A torque transducer operatively coupled with the steering wheel shaft and the steering gear generates a torque signal corresponding to the torque applied by the driver to the steering wheel. A resilient coupling also providing a range of unresisted lost motion is provided between the stepping motor and the steering gear and a transducer is operatively coupled therewith to develop a signal corresponding to lost motion. The torque signal and the lost motion signal are combined differentially and the resultant signal is used to control stepping of the stepping motor. When the driver applies torque to the steering wheel, the torque signal indicates driver input torque and the lost motion signal indicates the applied servo torque. Torque at the steering wheel which the driver senses indicates torque exerted by the stepping motor. When the driver releases the steering wheel, the torque signal drops to zero and the lost motion signal controls the energization of the stepping motor to overcome its resistance to the return of the dirigible wheels to the straight ahead position.
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