Engine Performance Improvement on Fuel Economy and Exhaust Emissions Using Lean Burn Control Technologies

Abstract:- To enhance fuel economy and reduce the exhaust emissions, a lean burn gasoline engine system using novel catalyst design has been developed, which is used for NOx emission aftertreatment. The goal is to investigate the impact of this catalytic system on emission characteristics and BSFC (break specific fuel consumption) across a broad engine speed and load operating region under diverse arrangement schemes of the new catalyst converter. It can be indicated from experimental results that the upstream placement of 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 fuel economy is also reflected by the periodic operating time of lean burn and rich burn as well as the time ratio between the two. Engine load has served as a major factor in affecting exhaust emission characteristics and fuel economy of the lean burn gasoline engine. The heavier the engine load, the higher the NOx emission level, the less the NOx converting efficiency and the lower the BSFC. This technology also has the potential to be applied to all other types of lean burn engines