摘要
以某带有高压共轨喷射系统和废气涡轮增压系统的直列6缸重型柴油机为试验对象,研究了EGR率对其燃油消耗率、NOx和烟度等排放参数的影响,同时还着重研究了EGR耦合喷射压力和喷射定时参数调整及EGR冷却温度对以上参数的影响。结果表明,EGR能有效改善柴油机NOx排放水平,但会导致经济性下降、碳烟排放增加,也会给HC和CO排放带来负面影响;EGR耦合喷射参数的折中策略改善了消光烟度和(NOx+HC)的排放,同时降低了燃油消耗以及PM和CO的排放;降低EGR温度可提高柴油机的使用性能。
The influence of exhaust gas recirculation（EGR） on fuel consumption rate,nitrogen oxide（NOx） and smoke intensity were studied through a test in an in-line 6-cylinder heavy-duty diesel engine equipped with high pressure common rail injection system and exhaust turbo-charging system.In addition,the combined influence of EGR coupling with injection pressure and injection timing on the above engine performance parameters were studied in the same way.The results show that with the help of EGR,the NOx emissions could be reduced at the cost of high fuel consumption and high soot emissions,and at the same time it also brings negative affects to the hydrocarbon compounds（HC） and carbon monoxide（CO） emissions.The strategy of adjusting EGR rate with injection pressure and injection timing synthetically optimizes the soot emission level,as well as the（NOx＋HC） emission level.And it also reduces fuel consumption and particulate matter（PM） and CO emissions.Diesel engine performance can be improved when we lower the temperature of EGR.
出处
《汽车技术》
北大核心
2013年第7期45-49,共5页
Automobile Technology
关键词
EGR
重型柴油机
燃油消耗率
排放
EGR
Heavy-duty diesel engine
Fuel combustion rate
Emission
