Power-Oriented Graph in automotive application: VVT modeling on Lamborghini V12 engine

In automotive applications the emission reduction and fuel consumption are relevant goals for manufactures so that several devices are introduce in the engine. One of such devices is Variable Valve Timing (VVT), modeled in this paper, that represents a complex multi physic system designed to control the intake camshaft: by opening and closing time of inlet and outlet valves are modified so that the engine conditions can satisfy the gaols in term of torque improvement in all the speed ranges as well as increasing fuel economy and reducing exhaust emission. In this paper the Power Oriented Graph (POG) technique has been used for modeling the considered electromechanical system allowing to detect some hide variables not readable by the sensors. The effectiveness of the proposed model has been validated using an experimental set-ut.