Control of a Variable Valve Timing Engine

cylinder-by-cylinder model of an experimental variable valve timing 4-cylinder engine has been developed. temperature, burned gas residual, and pressure dynamics, including combustion effects, as well as the valve actuator dynamics. The cylinder-by-cylinder model is used to obtain a cycle-averaged mapping between torque at a given engine speed and intake valve timing, which is suitable for future control design implementations. Variable valve timing also allows control of internal exhaust gas recirculation (by control of the valve overlap), allowing for control of NOx emissions produced during combustion.A cylinder-by-cylinder model of 4-cylinder vararible valve timing engine has been developed and correlated for peak pressure at several engine speed and load conditions.