赵联海1,2，史彦晓1,2，耿国芳1,2
1.内燃机可靠性国家重点实验室，山东潍坊261061;2.潍柴动力股份有限公司，山东潍坊261061
摘要：为降低柴油机NOx、烟度和颗粒物（particulate matter,PM）的排放，秉持设计、仿真、试验一体化的理念，基于PM生成机理，对采用废气再循环（exhaust gas recirculation,EGR）路线非道路国四阶段柴油机进行优化。在合理的试验设计基础上，结合实际路谱制定控制策略，围绕进气均匀性、预喷量、 喷油锥角等进行试验及仿真，提出减少进气管壁凹坑、使用厚度为1.0 mm的喷油器垫片、减小EGR阀开度闭环控制的前馈开度等优化措施，有效降低挖掘机尾气排放。
关键词：柴油机；仿真；高轨压；EGR
Abstract:In order to reduce the emissions of NOx, soot and PM of diesel engine, the engine of the nonroad China IV excavator is optimized by adopting EGR route based on the PM generation mechanism and adhering to the concept of integration of design, simulation and test. On the basis of design of experiments, combined with the actual road conditions, the spectrum control strategy system is formulated, and the test and simulation are carried out around the intake uniformity, preinjection amount and injection cone angle. The optimization measures such as reducing the intake pipe wall pit, using injector gasket with thickness of 1.0 mm, and reducing the feedforward opening of EGR valve closedloop control are proposed to effectively reduce the exhaust emission of excavator.
Keywords:diesel engine; simulation; high rail pressure; EGR
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