Power steering system having simulated torque sensor

Details Power steering system having simulated torque sensor Power steering system having simulated torque sensor

1988-04-29

1989-09-12

Hill, Mitchell J.

Motor vehicles

Compensating devices

B62D 504

Patent

active

048651443

ABSTRACT:
A closed-loop torque demand power steering system suitable for large off-highway and other vehicles has no mechanical linkages or hydraulic connections entering into the driver's cab. A torque demand signal is produced electronically without any separate electromechanical torque sensor. Upon starting, the system provides synchronization between steering and steering wheels without initial corrective motion of either member. During operation the direction of the steered wheels does not drift relative to the position of the steering wheel. The circuit includes protection against spurious steering signals that might otherwise occur if the steering is moved back and forth mechanically on a transition boundary of a position sensor. In the event of certain types of failure of its primary steering system it automatically changes over to an open-loop secondary steering system that is controllable by the same steering wheel, and that has components in common with the primary system.

REFERENCES:
patent: 3011579 (1961-12-01), Milliken

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