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In this investigation, a phenomenological model, that predicts the particulate matter emission (PM) of diesel engines, has been developed. The model is based on the formation mechanisms of nitrogen oxides (NOx) and PM diesel engines. It can predict the emission concentration of PM via the emission concentration of NOx. The concentrations of oxidants, local pressure and equilibrium temperature influence the concentrations of NOx and PM inside diesel engines. Experiments were carried out in two six-cylinder, heavy-duty, turbocharged and intercooled diesel engines. Comparisons of the model results with the experimental data show good agreement. The model is useful for computer simulations of electronically controlled diesel engines, as well as electronic control unit (ECU) designs for diesel engines.