李元昊,张守振,王浒,等.高压缩比汽油压燃低负荷燃烧优化控制策略试验研究[J].内燃机工程,2023,44(5):33-40.
高压缩比汽油压燃低负荷燃烧优化控制策略试验研究
Experimental Investigations on Optimization Control Strategies of Gasoline Compression Ignition Combustion with High Compression Ratio at Low Loads
DOI：10.13949/j.cnki.nrjgc.2023.05.005
关键词:汽油压燃  低负荷  高压缩比  燃烧稳定性  最大压力升高率  喷油策略
Key Words:gasoline compression ignition  low load  high compression ratio  combustion stability  maximum pressure rise rate  injection strategy
基金项目:国家重点研发计划项目（2022YFE0100100）
作者单位E-mail
李元昊* 天津大学 内燃机燃烧学国家重点实验室，天津 300072 li_yh@tju.edu.cn 
张守振 天津大学 内燃机燃烧学国家重点实验室，天津 300072 zhangshouzhen@tju.edu.cn 
王浒 天津大学 内燃机燃烧学国家重点实验室，天津 300072 wanghu@tju.edu.cn 
陈勇 天津大学 内燃机燃烧学国家重点实验室，天津 300072 yongchen@tju.edu.cn 
李冰 天津大学 内燃机燃烧学国家重点实验室，天津 300072 libingme@tju.edu.cn 
尧命发* 天津大学 内燃机燃烧学国家重点实验室，天津 300072 y_mingfa@tju.edu.cn 
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摘要:基于6缸柴油发动机的汽油压燃发动机试验台架，系统研究了喷油策略对采用高压缩比燃烧室的汽油压燃低负荷燃烧和排放特性的影响。结果表明：提高压缩比可有效改善汽油压燃低负荷燃烧稳定性、燃烧效率和指示热效率，同时降低CO和HC排放，但存在最大压力升高率过大的问题。采用两次喷射策略可有效控制最大压力升高率；预喷油量为3 mg、喷射间隔为10°时可将最大压力升高率从1.174 MPa/（°）降低为0.380 MPa/（°），压力循环波动率为0.97%，同时获得较高的指示热效率和较低的排放。采用高压缩比耦合优化喷油策略，可在平均有效压力为0.2 MPa工况下实现高效稳定燃烧，有效改善汽油压燃在低负荷下燃烧稳定性差的问题。
Abstract:The effects of injection strategies on the low load combustion and emission characteristics of gasoline compression ignition were investigated on a gasoline compression ignition engine platform of six-cylinder diesel engine with a high compression ratio combustion chamber. The results show that increasing the compression ratio can effectively improve the combustion stability， combustion efficiency and indicated thermal efficiency of gasoline compression combustion at low loads， and reduce CO and HC emissions， but there is a problem of excessive maximum pressure rise rate. The maximum pressure rise rate can be controlled effectively by using double injection strategy. When the pilot injection mass is 3 mg and the injection interval is 10°， the maximum pressure rise rate is reduced from 1.174 MPa/（°）to 0.380 MPa/（°）， and the coefficient of cycle indicated mean effective pressure（IMEP） variation is 0.97%. And higher indicated thermal efficiency and lower emissions are obtained. The high compression ratio coupling adjustment of the injection strategy may be used to produce high-efficient and stable combustion at 0.2 MPa brake mean effective pressure， which significantly improves the poor combustion stability of gasoline compression ignition under low loads.
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