黄昭明，沈凯，安宗权，陈伟国，潘金元.不同压缩比米勒循环和低压废气再循环对增压直喷汽油机性能影响[J].内燃机工程,2019,40(4):13-18.
不同压缩比米勒循环和低压废气再循环对增压直喷汽油机性能影响
Effects of Miller Cycle of Different Compression Ratios and Low Pressure EGR on Performance of Turbocharged Gasoline Direct Injection Engine
DOI：10.13949/j.cnki.nrjgc.2019.04.003
关键词:进气门早关  压缩比  废气再循环  增压  燃烧
Key Words:earlier intake valve closing（EIVC）  compression ratio  exhaust gas recirculation（EGR）  turbocharging  combustion
基金项目:国家自然科学基金资助项目（51806143）；安徽省教育厅高校学科（专业）拔尖人才资助项目（gxbjZD63）
作者单位
黄昭明，沈凯，安宗权，陈伟国，潘金元 1.河海大学 文天学院，马鞍山 243031；2.上海理工大学 机械工程学院，上海 200093；3.江苏大学 汽车与交通工程学院，镇江 212013；4.奇瑞汽车股份有限公司 汽车工程技术研发总院，芜湖 241006 
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摘要:通过对一台增压汽油直喷（gasoline direct injection, GDI）发动机活塞和凸轮型线的重新设计实现了高压缩比米勒循环，并在此基础上引入了废气再循环（EGR），研究了不同压缩比米勒循环和EGR综合作用对发动机的性能影响。结果表明：增大压缩比和采用米勒循环技术对爆震影响存在取舍（trade-off）关系，低速全负荷下高压缩比米勒循环相比原机油耗略有上升；而低压冷EGR技术由于缸内稀释冷却作用可以优化燃烧相位，对外特性工况有效燃油消耗率有明显的改善作用；在部分负荷工况下，压缩比的增加和米勒燃烧循环可使油耗较原机下降6.3%，在整合低压冷EGR技术后，油耗进一步下降3.1%。可以得出结论，合理地增加压缩比，采用米勒循环技术并匹配低压冷EGR技术，可以大幅改善发动机的燃油经济性。
Abstract:One new cam and three new pistons were designed for a turbocharged gasoline direct injection，(GDI) engine to realize high compression ratio Miller cycle. Moreover, exhaust gas recirculation(EGR) was adopted for the engine. The effects of the Miller cycle of different compression ratios and EGR on engine performance were investigated experimentally. The results show that there is a trade-off between high compression ratio and the Miller cycle in terms of knocking. The fuel consumption of the high compression ratio Miller cycle at low speeds with full load is slightly higher than that of the original engine; while low pressure cooled EGR can apparently improve engine fuel economy at full throttle characteristics conditions due to optimized combustion phase with its dilution and cooling effect. At part loads, the high compression ratio Miller cycle can lower fuel consumption by 6.3%. With low pressure cooled EGR fuel consumption can be further reduced by 3.1%. A conclusion can be drawn: The Miller cycle with a proper compression ratio and a low pressure cooled EGR can greatly improve engine fuel economy.
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