基于电控单体泵对4D44柴油机的优化研究

为了使传统直列泵柴油机满足国Ⅲ排放法规,在尽量不改变柴油机本体的前提下对燃油、进气和燃烧系统进行了优化。燃油喷射系统采用集成电控单体泵,高压油管长度和喷油器参数进行了优化;优化改进了进气道;重新设计了燃烧室;针对国Ⅲ排放法规测试特点进行了电控参数的优化。通过对整机进行13工况试验测试,表明优化改进后的柴油机排放性能得到明显提高,并达到国Ⅲ排放标准。

Optimization Research on 4D44 Diesel Engine Based on IEUP

n order to meet the third phase of national emission regulation,the fuel,intake and combustion systems were optimized under the condition that the engine body was not modified.The integrated electronic unit pump(IEUP) was adopted in the fuel injection system,and the length of high-pressure pipeline and the parameter of injector were optimized.Besides these,the intake port was improved,and the combustion chamber was redesigned.Finally,the electric control parameters were optimized according to testing characteristics for the third phase of emission regulation.It was proved that the emission performance for the optimized and improved diesel engine was markedly improved and could reach the third phase of national emission regulation by 13-mode test cycle.