张腾1，韩文涛2*，田占勇2，王林波2，安宁2，姚旺2
1.潍柴西港新能源动力有限公司，山东潍坊261061；2.潍柴动力股份有限公司，山东潍坊261061
摘要：研究进气流量传感器和废气文丘里流量计两种不同技术方案对废气再循环（exhaust gas recirculation，EGR）率控制精度的影响，并在采用理论空燃比的天然气发动机上进行试验验证。结果表明：基于废气流量计计算的EGR废气量精度更高，低速工况时相对误差小于4.27%，高速工况时相对误差小于0.35%；通过发动机台架EGR率测试，EGR率的相对误差小于2.64%，在可控范围内，且采用闭环控制策略，可保证EGR系统精准可靠地运行。
关键词：EGR系统；废气流量；EGR率；控制策略
Abstract:In order to explore the influence of two different technical schemes on the accuracy of EGR rate, intake flow sensor and exhaust venturi flowmeter are analyzed for a stoichiometric natural gas engine. The results shows that the accuracy of EGR gas volume calculated based on the exhaust air venturi method is more accurate. The error of EGR gas volume of the engine is 4.27% at low speed and within 0.35% at highspeed conditions. Engine test shows that the EGR rate error is within 2.64%. In addition, the EGR system adopted closedloop control strategy can make the operation of EGR system more accurate, reliable and stable.
Keywords:EGR system; exhaust gas flow; EGR rate; control strategy
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