The simulation and analysis model of a two-stage turbocharged V-typed 8-cylinder ECP diesel engine was built with the Wave software and was calibrated with bench test data. With the aim of optimal fuel economy, the influence of exhaust bypass valve opening and injection advance angle on diesel engine performance under the conditions of full load was calculated and the optimization and matching rules were acquired. The results show that the bypass valve opening and injection parameter influence the combustion and gas exchange process of two-stage turbocharged diesel engine directly. At high speed with high load, opening the bypass valve and increasing the injection angle appropriately should be done to decrease the higher exhaust back pressure and reduce pump loss. The higher the speed, the larger the bypass valve opening and injection advance angle were obtained. At medium and low speed with high load, the exhaust back pressure is lower than intake pressure, the pump loss is small, the bypass valve wasn't necessary to open and the injection advance angle should be decreased.%利用Wave仿真软件建立了某二级可调增压V型8缸电控单体泵柴油机的仿真分析模型,应用台架试验数据对模型进行了标定,以最佳燃油经济性为目标,计算了外特性条件下排气旁通阀开度与喷油提前角对柴油机性能的影响规律,得到两者的优化匹配规律.计算结果表明:旁通阀阀门开度及喷油参数直接影响二级可调高增压柴油机系统的燃烧和换气过程；高转速高负荷工况时需要打开排气旁通阀,并适当增加喷油提前角以降低过高的排气背压,减少泵气损失,且转速越高放气阀开度越大、喷油提前角越大；中低转速高负荷工况时,排气背压低于进气压力,泵气损失功小,不需要打开排气旁通阀,并且应适当减小喷油提前角.
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