Abstract
In this paper, energy optimal control theory is applied to steer by wire system (SBW). In the framework of usual optimal control theory, it is difficult to realize optimal control concerning energy regeneration and motion control simultaneously. The author proposed the energy optimal control theory it enables to control energy regeneration and motionmost suitably. Energy saving effect by SBW is small, but energy regeneration control acts the big role in a motion control aspect. Themeaning of the evaluation function and the control law are made clear. The relation between the control parameters and the vehicle parameters are analyzed, the generation mechanism of emergent steer and the improvement of the vehicle motion performance are made clear. This emergent steer in the situation of energy regeneration mode seems like counter steer which skillful driver does, and very excellent stability is made by this steer.
