Visteon Global Technolgoies, Inc.

Automotive Components Holdings, LLC

Ann Larsen

Yixin Yao

Behrouz Ashrafi

Deanna L Carroll

Philip Hemenway

Atiya M Ahmad

A steer-by-wire assemblyis provided, including a flexible polymer steering column shafthaving a fixed endand a free rotational endand a control featurein communication with said free rotational endThe flexible polymer steering column shaftprovides mechanical feel to the steer-by-wire system where prior mechanically actuated or servomotor devices were required.

Embedded sensor steering shaft

The present invention provides systems and methods of friction compensation in a steer-by-wire system or in a general electric steering system using control, estimation and modeling methodologies. A friction compensator in the steer-by-wire control system produces a friction compensating torque value equal and opposite in sign to the instantaneous friction torque. This compensating friction torque is added to the steering system control signal to eliminate the effects of friction present in the system such that the system performances are improved. The friction compensator produces the compensating friction torque according to one of two schemes: model-based or non-model based. The model-based scheme encompasses a number of different methods including a standard model-based scheme, a disturbance torque observer-based scheme, an adaptive friction compensation scheme, or a model reference adaptive control scheme. The non-model based scheme includes a fuzzy logic scheme.

Friction compensation in a vehicle steering system

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Southfield, MI, United States of America

Ann Larsen