王敏，杨蓉，叶洲，黄伟，楼狄明.商用车用电控柴油机增转矩工况的燃烧特性分析[J].内燃机工程,2020,41(5):23-31.
商用车用电控柴油机增转矩工况的燃烧特性分析
Research on Combustion Characteristics of Electronically Controlled Diesel Engine for Commercial Vehicles at Torque Increasing Condition
DOI：10.13949/j.cnki.nrjgc.2020.05.004
关键词:电控柴油机  增转矩工况  燃烧特性  能量转换效率
Key Words:electronically controlled diesel engine  torque increasing condition  combustion characteristic  energy conversion efficiency
基金项目:广西科技基地和人才专项项目（2018AD19349）；广西创新驱动发展专项（AA18242045-3）；广西教育厅科研项目（2018KY0024）；广西制造系统与先进制造技术重点实验室项目（19-050-44-S004）
作者单位
王敏，杨蓉，叶洲，黄伟，楼狄明 1.广西大学 机械工程学院，南宁 530004；2.同济大学 汽车学院，上海 201804 
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摘要:以一款商用车用电控柴油机为研究对象，针对恒转速增转矩工况的燃烧放热特性开展了台架测试和燃烧分析，重点分析了不同过渡时间和不同恒定转速下恒转速增转矩工况的燃烧特性。结果发现，发动机转矩加载过快时，易引起供油量突增，燃料的能量转换效率下降。而当发动机用较长时间平缓加载的过程中，可能因混合气浓度高导致燃料的能量转换效率下降。此外，恒转速增转矩过程中，随着转速的升高，压力急升点提前，燃烧速燃期延长，后燃期缩短，热功转换效率提高。总之，增转矩瞬态过程各个循环的燃烧效率与混合气浓度和各循环的燃烧放热规律密切相关。
Abstract:An electronically controlled diesel engine for commercial vehicle was taken as a research object, and bench test and combustion analysis were carried out to investigate the combustion heat release characteristics at constant speed with increased torque. The combustion characteristics at different transition time and different constant speeds with increased torque were analyzed. The results showed that when the torque of the engine was increased too rapidly, it was easy to cause a sudden increase in fuel supply and a decrease in fuel energy conversion efficiency. However, when the engine was loaded gently for a long time, the fuel energy conversion efficiency might still decrease due to high mixture concentration. In addition, in the process of increasing torque at constant speed, when the engine speed went up, the crank shaft angle corresponding to rapid increase in pressure was advanced, the rapid combustion period was prolonged, the post combustion was shortened, and the heat and power conversion efficiency was improved. In short, the mixture concentration and the law of combustion heat release were closely related to the combustion efficiency of each cycle in the transient process of increasing torque.
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