A Continuously Variable Transmission (CVT) is a type of transmissions that provides\na continuous range of speed ratios, thus it allows increasing the overall powertrain\nefficiency by running the engine at the optimal operating points. This paper\ninvestigates implementing a model based hydraulic pressure controller to achieve the\ndesired CVT gear ratio. A map of desired gear ratios was estimated using the Optimal\nOperating Line (OOL) strategy, which minimizes the engine fuel consumption according\nto a defined cost function and a set of systems constraints. The controller\nwas implemented in a complete vehicle model that includes driver, powertrain and\nroad load models. The model was subjected to two different driving cycles and the\nresults demonstrate the effectiveness of the control strategy and the pressure controller\nin keeping the engine at the most efficient operating regions.
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