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Additional fallback level for the failure of, for example, angle sensors, for steer-by-wire systems not having a mechanical/hydraulic fallback connection

  • US 20020033301A1
  • Filed: 09/04/2001
  • Published: 03/21/2002
  • Est. Priority Date: 09/20/2000
  • Status: Active Grant
First Claim
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1. A power-assisted steering system for a non-trackborne vehicle having wheels, said system comprising:

  • a steering control operated by a driver, a wheel angle positioner to steer the wheels, angle sensors to sense the position of the steering control and/or the wheels, a feel provider to generate a feel torque to simulate a feedback of force to the steering control, the feel provider having an electric motor with at least one winding, at least one control unit for controlling the wheel angle positioner and feel provider, wherein in the event of failure of one or more of the group selected from the at least one angle sensor, the at least one control unit and the feel provider, the angle to which the steering control is turned is continuously determined from a voltage which is induced in the at least one winding by turning the steering control manually and/or from the induced current, and is used to control the steering angle.

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