林思聪,冯浩,秦博,等.电增压及EGR共同作用下对降低汽油机燃油消耗率的试验研究[J].内燃机工程,2021,42(5):23-28.
电增压及EGR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 rate of gasoline engine under the combined action of electric supercharging and EGR
DOI：10.13949/j.cnki.nrjgc.2021.05.004
关键词:电动增压器  废气再循环  燃油消耗率  燃烧
Key Words:electric  supercharger, exhaust  gas recirculation, BSFC, combustion
基金项目:国家重点研发计划项目(2017YFB0103300)
作者单位E-mail
林思聪* 广州汽车集团股份有限公司汽车工程研究院 linsicong@gacrnd.com 
冯浩 广州汽车集团股份有限公司汽车工程研究院  
秦博 广州汽车集团股份有限公司汽车工程研究院  
李钰怀 广州汽车集团股份有限公司汽车工程研究院  
吴坚 广州汽车集团股份有限公司汽车工程研究院  
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摘要:为降低增压米勒循环发动机燃油消耗率，对一台1.5L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）的对比试验研究。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%至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，是燃油消耗率降低的主要原因，而提高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。
Abstract:In order to reduce the BSFC of supercharged Miller cycle engine, a 1.5L turbocharged direct injection gasoline engine was modified to improve its compression ratio and intake tumble. A comparative 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 scheme can significantly reduce the BSFC of the engine, the BSFC decreases by 5% to 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 reason for the decrease of BSFC, and the key to improve EGR tolerance is to optimize combustion structure to reduce ignition delay and combustion duration.
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