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...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。展开更多
A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger（VGT）were described,and t...A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger（VGT）were described,and their distinct effects on engine performance,i.e.NOxand soot emissions and fuel consumption,were simulated and compared on the basis of this model.The results showed that NOxemissions decreased obviously with the increase of exhaust gas recirculation（EGR）rate at constant boost pressure condition,but soot emissions and fuel consumption considerably increased.It was a good way to reduce NOxemissions without increasing fuel consumption and soot emissions when VGT was controlled to maintain the excess oxygen ratio unchanged as EGR rate increases.展开更多
文摘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。
基金Supported by Diesel Engine Development Program of MIIT(DEDP-1004)Natural Science Foundation of BIT(3030012211428)
文摘A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger（VGT）were described,and their distinct effects on engine performance,i.e.NOxand soot emissions and fuel consumption,were simulated and compared on the basis of this model.The results showed that NOxemissions decreased obviously with the increase of exhaust gas recirculation（EGR）rate at constant boost pressure condition,but soot emissions and fuel consumption considerably increased.It was a good way to reduce NOxemissions without increasing fuel consumption and soot emissions when VGT was controlled to maintain the excess oxygen ratio unchanged as EGR rate increases.
