Patent ID: 7392121
Filing Date: 2008-06-24
Classification: B62D

Abstract:
1. A vehicle steering system comprising: a steering actuator that imparts a steering force to a steering mechanism of a vehicle; an automatic steering controller that performs an automatic steering control by controlling the steering actuator based on a target steering angle; a steering angle detector that detects an actual steering angle of the steering mechanism; a steering angle deviation determination unit that determines whether or not a steering angle deviation which is a deviation of an actual steering angle detected by the steering angle detector relative to the target steering angle exceeds a predetermined threshold value; a deviation factor determination unit that determines whether or not an output shortage of the steering actuator constitutes a factor of the deviation when the steering angle deviation determination unit determines that the steering angle deviation exceeds the predetermined threshold value; and an automatic steering cancellation unit that causes the automatic steering control by the automatic steering controller to continue when the deviation factor determination unit determines that the output shortage of the steering actuator constitutes the factor of the deviation, and cancels the automatic steering control by the automatic steering controller when the deviation factor determination unit determines that the output shortage of the steering actuator does not constitute the factor of the deviation.