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Control solutions for vehicles with continuously variable transmission

The paper presents aspects concerning the modeling, driving scenarios and control structures of two classes of vehicular power train systems with continuously variable transmission (CVT). The modeling includes an analysis of the systems' components which include the spark-ignition internal combustion engine, the torque converter, the continuously variable transmission and the wheels. The CVT offers a continuum of infinitely variable gear ratios between established minimum and maximum limits compared to the automatic transmission which has only five gear ratios. Five driving scenarios are illustrated by digital simulation results: acceleration, overtaking maneuver, ramp encounter, engine brake, and cruise. Digital simulations are presented to test and validate the developed control solutions for one driving scenario.