Modelica Applications for Camless Engine Valvetrain Development
Christopher Puchalsky, Thomas W. Megli, Michael M. Tiller, Nate R. Trask, Yan Wang · 2002
Several variable valvetrain technologies are being aggressively pursued to increase vehicle fuel economy and reduce engine exhaust emission levels. Electromechanical Valve Actuation (EMVA) is a promising alternative that uses electromagnetic actuators to replace the conventional camshaft and provide fully flexible valve timing control. This "camless " valvetrain provides new opportunities and challenges for engine control optimization. In this work, we present two Modelica applications for EMVA development. Control and prediction of the Air to Fuel (A/F) ratio in a port fuel injected spark-ignited (PFI SI) engine is an important factor for emissions, performance, and fuel