An alternate control framework development for atkinson cycle engine using variable late intake valve

A new control framework for VCR Atkinson cycle VVT engine with an unconventional Late Intake Valve Closing (LIVC) strategy instead of the throttle, is developed to ascertain its better fuel economy in comparison with the conventional Otto cycle engine. In this context, the authors have already proposed a control-oriented Extended Mean Value Engine Model (EMVEM) of the Atkinson cycle engine with variable intake valve actuation. The proposed control strategy is developed on the same model evaluated for the standard Urban driving cycles at medium and higher operating conditions in the fuel economy perspective. It has the potential to deal better with the engine throttling effect and to enhance its thermal efficiency that will result in significant improvement in performance, fuel economy and emissions reduction. The controllability analysis of the EMVEM model in viewpoint of control design is carried out with respect to the alternative control input. The simulation results exhibit the better thermal efficiency and reduction in the engine part load losses. Consequently, significant enhancement in the fuel economy of the Atkinson cycle VVT engine with the proposed control input is achieved over Otto cycle engine.