Effect of soot accumulation in a diesel particle filter on the combustion process and gaseous emissions

▸ The increasing back-pressure associated with filter loading led to increasing exhaust temperature and pressure. ▸ These changes modified the combustion process, moving the engine operation away from its initial conditions. ▸ Although EGR valve was unaffected, the EGR ratio decreased, leading to 60% increase in NOx emissions. ▸ The increase in fuel consumption exceeded the predictions based on pumping losses.