Patent ID: 9043091
Filing Date: 2015-05-26
Classification: B62D

Abstract:
1. A vehicle steering system in which an operating member that is operated for steering is not mechanically coupled to a steering mechanism and the steering mechanism is driven by a steered system motor, comprising: an angle sensor configured to detect an operation angle of the operating member and an operation angular velocity of the operating member; a malfunction detection unit configured to detect occurrence of a partial malfunction in the angle sensor, the partial malfunction being such a malfunction that allows detection of the operation angular velocity of the operating member but does not allow detection of the operation angle of the operating member; a first control unit configured to control the steered system motor using the operation angle that is detected based on a signal output from the angle sensor when no partial malfunction of the angle sensor is detected by the malfunction detection unit; and a second control unit configured to control the steered system motor such that the steered system motor is rotated in one direction and, each time an absolute value of the operation angular velocity that is detected based on a signal output from the angle sensor exceeds a predetermined threshold, a rotation direction of the steered system motor is reversed, when the partial malfunction in the angle sensor is detected by the malfunction detection unit.