EGR阀开度对柴油发动机性能的影响
王睿，程晓章，管金彪
合肥工业大学汽车与交通工程学院，安徽 合肥 230009
摘要：为提高柴油发动机性能，对某柴油机进行不同负荷、不同EGR阀开度的台架试验，研究废气再循环（exhaust gas recirculation，EGR）技术对发动机性能的影响。结果表明：不同负荷下，EGR阀开度增大，NOx排放减少，碳烟排放增加；发动机负荷越大，爆压越大；EGR阀开度增大，发动机爆压减小；发动机负荷对燃油消耗率的影响较大，低负荷下，随EGR阀开度增大，燃油消耗率降低；中负荷下，EGR阀开度对燃油消耗率影响不大；高负荷下，随EGR阀开度增大，燃油消耗率增大。为实现发动机燃油经济性及排放性能之间的平衡，发动机中、低负荷下可适当增大EGR阀开度，高负荷下应适当减小EGR阀开度。
关键词：EGR阀开度；燃油经济性；NOx排放；爆压
The influence of EGR valve opening on a diesel engine performance
WANG Rui, CHENG Xiaozhang, GUAN Jinbiao
School of Automobile and Transportation Engineering, Hefei University of Technology, Hefei 230009, China
Abstract: In order to improve the diesel engine performance, the bench test of a diesel engine under different loads and EGR valve openings is carried out to study the influence of exhaust gas recirculation technology on the engine performance. The results show that under different loads, the increase of EGR valve opening reduces theNOx emission and increases the carbon emission. The greater the engine load, the greater the peak pressure.The increase of EGR valve opening reduces the engine peak pressure. The engine load has a greater influence on the fuel consumption rate, the fuel consumption rate decreases with the increase of EGR valve opening under low load, the EGR valve has little effect on the fuel consumption rate under medium load, the fuel consumption rate increases with the increase of EGR valve opening under high load. In order to achieve a balance between the fuel economy and emission performance of the engine, the EGR valve opening can be appropriately increased under medium and low loads of the engine, and the EGR opening should be appropriately reduced under high load.
Keywords: EGR valve opening; fuel economy; NOx emission; peak pressure
