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压缩点火（英语：Compression ignition，简称：CI）是柴油发动机的油气燃烧方式。当活塞到达一个阶段，利用发动机中压缩空气所产生的热，使喷出的柴油燃烧，利用压缩热而不使用火花塞点火，就是所谓的压缩点火。
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