电增压及废气再循环共同作用下对降低汽油机燃油消耗率的试验研究  

Experimental Study on Reducing Fuel Consumption of Gasoline Engines Under the Combined Action of Electric Supercharging and Exhaust Gas Recirculation

作　　者：林思聪 冯浩 秦博 李钰怀 吴坚 LIN Sicong;FENG Hao;QIN Bo;LI Yuhuai;WU Jian(GAC Automotive Research&Development Center,Guangzhou 511434,China)

机构地区：[1]广州汽车集团股份有限公司汽车工程研究院,广州511434

出　　处：《内燃机工程》2021年第5期29-35,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点研发计划项目(2017YFB0103300)。

摘　　要：为降低增压米勒循环发动机燃油消耗率,对一台1.5 L增压直喷汽油机进行改制,提高其压缩比与进气滚流,进行了电动增压与废气再循环(exhaust gas recirculation,EGR)降低燃油消耗率(brake specific fuel consumption,BSFC)的试验研究。试验结果表明:高压缩比EGR方案能大幅降低发动机燃油消耗率,燃油消耗率下降5.0%~13.6%。最高有效热效率达到41.2%,这主要得益于传热损失、换气损失的减少和膨胀做功的增加。提高EGR率能减少传热损失与提前燃烧重心,这是燃油消耗率降低的主要原因。提高EGR容忍度的关键是优化燃烧组织以减小点火滞燃期和燃烧持续期。In order to reduce the brake specific fuel consumption(BSFC)of supercharged Miller cycle engines,a 1.5 L turbocharged direct injection gasoline engine was modified to improve its compression ratio and intake tumble.A experimental study on reducing BSFC by electric supercharging and exhaust gas recirculation(EGR)was carried out.The experimental results show that the high compression ratio EGR can significantly reduce the BSFC of the engine,which decreases by 5.0%~13.6%.And the maximum effective thermal efficiency reaches 41.2%,which is mainly due to the reduction of heat transfer loss,air exchange loss and the increase of expansion work.Increasing EGR rate can reduce the heat transfer loss and advance the combustion center,which is the main factor for the decrease of BSFC.And the key to improve EGR tolerance is to reduce ignition delay and combustion duration by optimizing combustion structure.

关 键 词：电动增压器 废气再循环 燃油消耗率 燃烧 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]