A method of drivability control is newly developed for hybrid vehicles. One of the significant advantages of this mechod is to make the most of operating freedom in a propelling system without disturbing drivability. The purpose of this paper is to discuss the significance of the oprating freedom, and then to deccribe the basic concept of the control method and its applications.
The drive control is preformed by tracking to satisfy a drive control criterion, which is given as a function of the accelerator pedal position, the vehicle velocity and its acceleration. The criterion, which does not include any characteristics of a power source, facilitates the effective utilization of the operating freedom.