A control device for a vehicle

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PROBLEM TO BE SOLVED : To prevent a turning performance of a vehicle from being deteriorated by an increased steering wheel operating torque and an increased turning radius during a turning operation if a steering assists control for eliminating a course deflection caused by a driving force difference between the right ad left wheels at a crossover way showing different road surface frictional coefficients against the right and left wheels. SOLUTION : A steering control device for a vehicle performs a steering assist control for restricting a variation in action of the vehicle caused by a difference in driving power forces of right and left wheels in such a way that a basic assisting torque Tab is calculated on the basis of the steering operation (S20) and an assist steering torque Tca eliminating a yawing momentum caused by a driving force difference ΔFw between the right and left wheels is calculated on the basis of the driving force difference ΔFw (S40 to 60). In the case that the steering assist is carried out (S100) on the basis of a sum of Tab and Tca, a gain Kg (Fig. 4) becoming small as long as an index value (a yawing rare) indicating the right and left values of load motion amounts is high is multiplied by Tca to correct Tca (S60). COPYRIGHT : (C)2008, JPO&INPIT