2缸高压共轨柴油机增压器性能匹配与研究

针对一款2缸高压共轨4气门增压柴油机,基于2缸柴油机进、排气压力波动的特殊性,研究了不同发火顺序的发动机排气对增压器匹配的影响,选择了360°CA的发火顺序,分析了2缸柴油机增压器效率的波动及泵气损失的特点。兼顾乘用车对柴油机高低速性能的要求,设计了2种方案的增压器进行分析和匹配试验,提出了增压器的改进优化技术措施并进行了优化试验。试验结果表明:柴油机中低速性能得到了改善,低速扭矩增加了8N.m,燃油消耗率降低了12g/(kW.h),柴油机的各项性能指标满足设计目标,排放达到欧Ⅳ标准。

Study on Turbocharger Performance Matching for Two-Cylinder High Pressure Common Rail Diesel Engine

For a 2-cylinder,4-valve per cylinder,turbocharged high pressure common rail diesel engine,the influence of different firing orders on turbocharger matching was studied,and the 360°CA firing order was selected.Considered turbocharger efficiency and engine pumping loss and the passenger car special requirement to meet both high and low speed performance,two turbocharger schemes were designed.On the basis of matching test results,optimization measures for the turbocharger were proposed.Final results show that the engine performance at low and middle speeds is improved,low speed torque increases by 8N.m,and specific fuel consumption reduces by 12g /(kW.h).Engine performance reaches the design targets and exhaust emissions meet EuroⅣemission standards.