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Vehicle steering system

  • US 8,775,028 B2
  • Filed: 03/14/2013
  • Issued: 07/08/2014
  • Est. Priority Date: 03/22/2012
  • Status: Active Grant
First Claim
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1. A vehicle steering system in which a steering member that is allowed to be rotated 360 degrees or more and a steered wheel are not mechanically coupled to each other, comprising:

  • a steering angle sensor that detects a steering angle of the steering member;

    a steering system actuator that drives the steered wheel;

    a rotation angle restriction mechanism that is switchable between a first state in which a rotation angle of the steering member is restricted within a first rotation angular range that is larger than or equal to 360 degrees and a second state in which the rotation angle of the steering member is restricted within a second rotation angular range that is smaller than 360 degrees;

    a switching mechanism that selectively switches the rotation angle restriction mechanism into the first state or the second state;

    a steering direction detection unit that, when the rotation angle restriction mechanism is in the second state, detects a steering direction of the steering member on the basis of at which one of a pair of terminal ends of the second rotation angular range, the steering member is located; and

    a control unit that has a normal mode in which drive control is executed on the steering system actuator on the basis of the steering angle detected by the steering angle sensor and a failure mode in which, when there is a malfunction in the steering angle sensor, drive control is executed on the steering system actuator on the basis of the steering direction detected by the steering direction detection unit in a state where the rotation angle restriction mechanism is switched into the second state by the switching mechanism.

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