A turbocharged GDI engine with variable intake tumble is used to study the effects of EGR combined with enhanced tumble on the engine’s economy, power, and emissions characteristics. The effects of EGR with enhanced intake tumble flow, on the combustion phase, combustion duration, knock index and combustion cycle variation of the engine, were studied at two speeds of 1500 r/min and 2000 r/min from low to medium and to full load. The research shows that although the commercial engine has been well calibrated and optimized, the optimization of EGR and enhanced tumble flow together with the optimization of the ignition angle can improve the engine’s economy and emission characteristics, while maintaining relatively fast burning speed and low combustion cycle variation. From medium to heavy load, the economy can be improved by 2.6∼10 %, and the minimum fuel consumption can be reduced to 213 g/kW.h (η_e = 36.8 %). At the same time, the increase of the combustion cycle variation is controlled within 5 %, but as the load and the EGR ratio increase, the power loss cannot be compensated by the advance of the ignition angle. The 6 ∼ 21 % EGR ratio brings 3.5 ∼ 9 % power loss.

使用可变进气滚流的涡轮增压 GDI 发动机研究 EGR 与增强滚流相结合对发动机经济性、功率和排放特性的影响。在1500 r/min和2000 r/min从低到中到全速两种转速下，研究了增强进气滚流的EGR对发动机燃烧阶段、燃烧持续时间、爆震指数和燃烧循环变化的影响。加载。研究表明，虽然商用发动机已经得到了很好的校准和优化，但EGR和增强滚流的优化以及点火角的优化可以提高发动机的经济性和排放特性，同时保持相对较快的燃烧速度和较低的燃烧循环变化。从中负荷到重负荷，经济性可提高2.6∼10%，_e = 36.8%）。同时，燃烧循环变化的增加控制在5%以内，但随着负荷和EGR率的增加，功率损失无法通过提前点火角来补偿。6 ∼ 21 % 的 EGR 比率带来 3.5 ∼ 9 % 的功率损失。