进气相位对高膨胀比汽油机部分负荷特性的影响

摘要

One-dimensional simulation model of 1. 8 L natural aspirated gasoline engine was built to study the influence of intake phase on part load performance for high expansion ratio gasoline engine. The cycle with high expansion ratio was carried out based on the original engine and the working performance at different speeds and loads was simulated and calculated. The results show that, compared with the later intake valve closing, the late intake vale closing is more beneficial to reduce pumping loss, improve thermal efficiency and fuel economy at part load.%为研究进气相位对高膨胀比汽油机部分负荷性能的影响,建立了某1.8L自然吸气汽油发动机一维仿真模型,在原始机型的基础上执行高膨胀比循环,模拟计算了不同转速、不同负荷下高膨胀比循环工作性能,结果显示,在部分负荷时,相对于较大的进气门迟闭角,较小的进气门迟闭角更有利于降低部分负荷泵气损失、提高热效率、改善燃油经济性.