The result shows that after cold start combustion in the cylinder is unstable and incomplete combustion or misfire exits. There is much difference between cylinders in combustion stability.

结果表明：汽油机冷起动后，缸内处于不稳定的燃烧状态，出现不完全燃烧或失火，并且各缸间的燃烧稳定性相差很大。

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The results show that a proper increase of residual gas fraction could promote ignition and combustion stability of first firing cycle significantly during cold start.

结果表明，通过调节排气门关闭正时，适当增大缸内残余废气量，可显著改善起动过程初始着火循环的着火燃烧性能和提高起动过程缸内燃烧的稳定性。

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