Engine-CVT consolidated control using LQI control theory

For the drivetrain control, it has become important for fuel economy or AHS to control the throttle valve of the engine and the gear ratio of CVT simultaneously by DBW when the automobile is equipped with CVT. In this paper, LQI control theory was applied to control the drivertrain as a 2-I/O system to satisfy the demanded speed and better fuel economy. Moreover, modification of the weight parameter of LQI was investigated to obtain the desired performance for fuel economy or vehicle acceleration. Relatively good results were obtained.