The performance optimization of turbocharged common-rail diesel engine was carried out.Taking the China Stage 4 emission standard and less than 5 ％ fuel consumption deterioration as the as the objectives,five combustion boundary parameters,including injection parameters and Exhaust Gas Reeirculation (EGR) rate were set for performance optimization on ESC-B speed 50％ load rate.Results show the response surface method can determine the key factors that influence the engine performance.The influence of each factor is highly impacted by the specific performance parameter.The interactions among the key factors or between key and minor factors have greater contribution to the engine performance than the interaction among minor factors.Combined with satisfactory degree function,the optimal performance can be accurately estimated,The NOx and soot specific emissions are respectively reduced to 3.43 g · (kW · h)-1 and 0.019 g · (kW · h)-1,while the fuel consumption is slightly higher compared with the prototype.This response surface methodology can be used for engine performance research and development.%在一台增压中冷共轨柴油机上利用实验设计响应曲面法进行性能优化研究.研究选取喷油参数和EGR率共5个影响因子,并以国4排放标准及低于5％油耗量恶化为限定目标,以稳态测试循环B转速50％负荷工况为例,获得的多目标优化因子组合数据结果表明:响应曲面模型可以确立影响发动机性能的核心影响因素,且因素贡献度高低与发动机具体性能参数有关;主因参数之间、主因与次因参数之间的交互作用对发动机性能的贡献度要大于次因参数之间的交互作用;结合满意度函数准确预测出了满足目标设定要求的最佳性能,NOx比排放和消光烟度分别为3.41 g· (kW· h)-1和4.7％,油耗率为221.3 g·(kW·h)-1,可为发动机性能研发工作提供参考.
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