| 摘要:尾气后处理的转化效率受排温影响，而柴油机中低负荷下排温较低，难以满足要求。以某中型柴油机为对象，针对影响排温的进气节流阀(IAT)、电控废气旁通阀(EWG)和排气背压阀(EAT)进行了中低负荷稳态点控制策略的试验研究。试验结果表明:在满足低排放和低油耗的前提下，仅靠单一排气热管理措施难以提高排温，须两种或两种以上措施合理匹配，共同作用。基于此，提出了可行的排气热管理方案，并在WHTC测试循环下验证了该方案可使试验柴油机在保证经济性和排放的变化在可接受范围内，满足排温要求。 |
| 关键词: 中型柴油机 排气热管理 WHTC测试循环 排温 欧Ⅵ排放标准 |
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| Experimental Study on Exhaust Gas Thermal Management Technology forMedium Diesel Engines Based on Euro VI Emission Standard |
| Yu Yonghua,Chen Yonghui |
| School of Energy and Power Engineering，Wuhan University of Technology，Hubei Wuhan 430063;Key Laboratory of Marine Power Engineering Granted by Ministry of Transport,Wuhan University of Technology，Hubei Wuhan 430063 |
| Abstract:The conversion efficiency of exhaust gas after-treatment is influenced by exhaust temperatures. The low exhaust gas temperature at the working condition with low or medium load of diesel engine cannot meet the requirement of exhaust gas after-treatment. A medium diesel engine was chosen as the research object, some measures include intake air throttle (IAT), electronic waste gate (EWG), exhaust air throttle (EAT),which affect exhaust temperatures, have been taken to investigate thermal management control strategies on steady states with low and medium load. The experiment results show that in order to meet with low emissions and low fuel consumption, single measure of exhaust gas thermal management cannot increase the exhaust temperature, therefore, it is necessary to use two or more kinds of measures. Based on the above research, feasible solution of thermal management is put forward and successively verified by WHTC test cycle, which can make the test diesel engine meet the exhaust temperature requirement, and at the same time, keep the change of economy and emissions within acceptable range. |
| Key words: medium diesel engine exhaust gas thermal management WHTC test cycle exhaust temperature Euro Ⅵ emission standard |
