在发动机燃用稀薄混合气时，喷油定时对排放和经济性的影响较为明显。
Compared with stoichiometric mixture operation, fuel economy and emissions are remarkably influenced by injection timing when lean mixture is applied.
结果表明，该直喷汽油机具有较强的滚流性能，有利于分层混合气的形成和稀薄燃烧。
The results show that a rather strong tumble motion exists in this GDI engine, which is beneficial to the formation of stratified mixture and lean combustion.
模拟计算表明，利用早喷可以形成稀薄准均质混合气；燃烧室形状影响混合气浓度场和温度场。
The results show that the lean quasi-homogeneous mixtures can be formed by early-injection, and the shape of combustion chamber has an obvious effect on density and temperature fields of mixture.
稀薄燃烧；两次喷油；准均质混合气；二气门汽油机；
Lean burn; Twice electronic fuel injection; Quasi-homogenous mixture; 2-valve SI engine;
结果表明在纵向进气滚流作用下，压缩终了时，缸内混合气明显呈分层构造，在火花塞附近聚集较浓的可燃混合气，实现部分负荷工况下的稀薄燃烧。
The results indicated that, at the end of compress stroke, the mixture in cylinder was stratified and richer ignitable mixture was concentrated around the spark plug under the action of the lon...
结果表明在纵向进气滚流作用下，压缩终了时，缸内混合气明显呈分层构造，在火花塞附近聚集较浓的可燃混合气，实现部分负荷工况下的稀薄燃烧。
The results indicated that, at the end of compress stroke, the mixture in cylinder was stratified and richer ignitable mixture was concentrated around the spark plug under the action of the lon...
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