车用重型柴油机二级增压系统模拟及试验研究

摘要

针对某车用重型柴油机进行了二级增压系统匹配研究,根据产品开发目标要求选择了高、低二级增压器.采用GT-Power软件建立了二级增压柴油机仿真模型,并对柴油机外特性稳态工况性能进行了模拟计算,分析了二级增压系统能量分配对柴油机性能的影响规律.建立了二级增压柴油机测试平台,并进行了外特性、万有特性及排放特性试验.模拟及试验结果表明,二级增压系统可以大幅提高柴油机低速扭矩,改善燃油经济性,拓宽柴油机燃油经济性运行区域,大幅降低柴油机PM排放.%The matching of two-stage turbocharged system for a vehicle heavy-duty diesel engine was studied. Based on the requirements of product development, the high and low pressure stage turbocharger was selected. Using GT-Power software, the simulation model of two-stage turbocharged diesel engine was established, the full load conditions were simulated and calculated,and the influences of two-stage turbocharged energy distribution on diesel engine performance were analyzed. Finally, the test platform of two-stage turbocharged diesel engine was built and the experiments of external characteristic, universal characteristic and emission characteristic were carried out. The simulated and experimental results show that the two-stage turbocharged system can significantly increase the torque at low speed, improve the fuel economy,extend the operating area of fuel economy and greatly reduce the PM emission of diesel engine.