TGDI 发动机超级爆震特性研究

摘要

The effects of single injection and secondary injection on super knock in a certain working condition of turbocharged gasoline direct injection engine were researched .Then the influences of intake and exhaust camshaft phase ,intake temperature , ignition advance angle ,air‐fuel ratio ,engine water temperature and crankcase ventilation system on super knock were analyzed based on secondary injection strategy .The results show that the secondary injection can suppress the super knock effectively , increase the engine water temperature and decrease the air‐fuel ratio .The appropriate advance of exhaust phase can reduce the frequency of super knock and the intake temperature and ignition advance angle has little influence on super knock .%研究了单次喷射及二次喷射对涡轮增压直喷汽油机某工况下超级爆震的影响，分析了二次喷射策略下进排气凸轮相位、进气温度、点火提前角、空燃比、发动机水温及曲轴箱通风系统对超级爆震的影响情况。结果表明，采用适当的二次喷射策略能有效抑制超级爆震的发生，增加发动机水温，降低混合气空燃比，适当提前排气相位可以减少超级爆震的频次，进气温度及点火提前角对超级爆震现象的改善不大。