准均质充量压缩点火燃烧(QHCCI)方式占总燃料多数的预混合燃料以稀薄燃烧完成，故可能有很低的排放，尤其是碳烟和氮氧化物。

Quasi homogeneous charge compression ignition (QHCCI) combustion may be with low emissions, especially for soot and NO_X, according as the most fuel which is pre-mixed is lean burnt.

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本文根据天然气发动机混合气的形成特点，把天然气发动机分为预混合燃烧型和非均质扩散燃烧型，并分析了这两种天然气发动机的技术特点、燃烧特点与排放等性能。

According to the features of the mixture formation in natural gas engine, natural gas engine can be classified as two types: premixed combustion type and heterogeneous diffusive combustion type.

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