Patent ID: 6913109

Claim:
A vehicle steering control system for a vehicle wherein a steering angle to be given to a wheel steering shaft is determined in dependence on a steering angle given to a handle shaft for steering operation and a driving state of said vehicle so that said wheel steering shaft is rotationally driven by a steering shaft drive motor to be given said determined steering angle, said control system comprising: a current sensor for detecting a current applied to said steering shaft drive motor; a motor rotational speed detection section for detecting a motor rotational speed of said steering shaft drive motor; current inference means for inferring a motor current applied to said steering shaft drive motor based on the motor rotational speed detected by said motor rotational speed detection section; abnormal judgment means for comparing said current inference value obtained by said current inference means with a current detection value indicated by an output of said current sensor and for judging whether said current sensor is properly operating, based on a result of the comparison; and judgment output means for outputting the result of judgment when said current sensor is judged to be not properly operating.