Vehicle steering system
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
In normal times, a rotation angle restriction mechanism in a first state restricts a rotation angle of a steering member within a first rotation angular range. In the event of a failure, that is, when there is a malfunction in a steering angle sensor, the rotation angle restriction mechanism is switched into a second state by an electromagnetic clutch, and the rotation angle of the steering member is restricted within a second rotation angular range. A steering direction is detected on the basis of at which one of a pair of terminal ends of the second rotation angular range, the steering member is located. An ECU executes drive control on a steering system actuator on the basis of the detected steering direction.
20 Citations
4 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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Specification