Design of a Nonlinear Control System for Continuously Variable Transmission

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In order to operate SI(Spark Ignition) engine at the optimal fuel efficiency, it is necessary to use continuously variable transmission(CVT) which has more excellent fuel consumption property than transmissions of gear box types commonly used. This study introduces new type of nonlinear control approach to control precisely CVT including nonlinear characteristics. The nonlinear controller is basically composed of input-state feedback linearization, which can cancel the nonlinearities included in CVT on specific controllable area, and sliding-mode control. In this paper, good control performance of contrtol system with the nonlinear controller is confirmed with computer simulations.