Patent ID: 6991061
Filing Date: 2006-01-31
Classification: B62D

Abstract:
1. A system for steering a vehicle whereof steering of all the steetable wheels is controlled by an actuator specific thereto, the system having at least one lever for controlling the steering available to the driver in order to affect the trajectory of the vehicle, each steerable wheel being provided with measuring means allowing the steering angle of the said steerable wheel to be estimated, the system having: a controller which has at least a normal mode of operation in which, for each steerable wheel, the controller determines a set point for the normal steering angle at least as a function of the driver's operation of his or her control lever and having at least a degraded mode activated in the event of failure of a wheel actuator; and means for detecting the failure of a wheel actuator which activates the said degraded mode and transmits to the controller the location on the vehicle of the wheel whereof the actuator has failed, wherein, in the degraded mode activated in the event of failure of a given wheel actuator, the controller determines at least one compensating steering set point for another steerable wheel, and the value of the compensating steering set point depends on the difference, both as regards size and sign, between the normal steering angle which is calculated and the steering angle measured on the steerable wheel whereof the actuator has failed.