Lean Burn Engine Control for Fuel Economy and Exhaust Aftertreatment

Abstract:- A novel catalyst system has been developed for NOx emission aftertreatment of a lean burn gasoline engine. The goal is to investigate its impact on emission characteristics and BSFC (Break Specific Fuel Consumption) across a broad engine speed and load operating region under various arrangement schemes for the new catalyst converter. It has been indicated from experimental results that the upstream placement of TWC (Three Way Catalyst) ahead of the NOx Adsorber Catalyst is the best solution, which gives rise to the highest converting efficiency to reduce the NOx emission level of the lean burn gasoline engine. The role of engine speed on exhaust emissions and BSFC is also reflected by the operating time of lean burn and rich burn as well as the time ratio between the two. Engine load is a major factor in affecting exhaust emission characteristics and BSFC of the lean burn gasoline engine. The heavier the engine load, the higher the NOx emission level, and the lower the BSFC