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A vehicle sometimes pulls to one side during traveling straight. This is caused by lateral disturbance, such as road contour, suspension alignment error and tire properties. This paper describes a new algorithm of reducing steering pull by using electric power steering system(EPS). It is shown that the disturbance can be cancelled with EPS motor torque. The amount of the torque is equal to the steady driver's torque to keep the vehicle straight driving. It is estimated by using statistic method. We validate our study by driving test conducted with an actual vehicle.

In the first half of this paper describes a new algorithm of an electric power steering system control. The problem of the vehicle with ordinary steering and the reason why it occurs physically are clarified. It is shown as the low damping of the transfer function of steering angle / steering torque at high speed. This is derived from interference between steering system and vehicle system. So, we strictly solved the controller using simple model, and then in order to maintain the stability of the controller, we approximated strict solution as simple controller, that is described as first order non-minimum phase transfer function. and we validate our result of analysis by driving test conducted with an actual vehicle.

Brake judder caused by uneven heat spots on brake disc surfaces is a major issue in improving vehicle quality. This is especially true for rumble that occurs during high-speed braking. In order to determine the excitation mechanism of brake judder, it is necessary to measure the dynamic brake disc geometry and temperature distribution during actual operation on the road. A noncontact sensor system, suitable for a high temperature environment, was used to monitor these parameters, making it possible to visualize heat spots transiently. The data obtained revealed the influence of pad and disc parameters on heat spot formation.