均质压燃是一种内燃机的工作方式，这种内燃机把燃料和氧化剂充分混合压缩，达到自燃点。如同其他燃烧，均质压燃通过放热反应将化学能转化为功和热。

均质压燃的汽油发动机可以将燃油效率达到柴油发动机的水平，同时在不使用催化转换器的情况下保持低的氮氧化物NO_x排放标准。

Homogeneous charge compression ignition (HCCI) is a form of internal combustion in which well-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition. As in other forms of combustion, this exothermic reaction releases chemical energy into a sensible form that can be transformed in an engine into work and heat.