Diesel engine combustion is mainly diffusion combustion, while gasoline engine combustion is premix combustion. These two modes of combustion could not resolve the trade-offs between PM and NO X.

• 柴油机以扩散燃烧为主 ,汽油机燃烧是预混燃烧 ,两种燃烧方式都不能解决碳烟和氮氧化物生成的trade-offs关系。