A New Ignition Delay Formulation Applied to Predict Misfiring During Cold Starting of Diesel Engines

A new formulation is developed for the ignition delay (ID) in diesel engines to account for the effect of piston motion on the global autoignition reaction rates. A differentiation is made between the ID_e measured in engines and ID_v, measured in constant volume vessels. In addition, a method is presented to determine the coefficients of the ID_e correlation from actual engine experimental data. The new formulation for ID_e is applied to predict the misfiring cycles during the cold starting of diesel engines at different low ambient temperatures. The predictions are compared with experimental results obtained on a multi-cylinder heavy-duty diesel engine.