基于自行搭建的高能量点火装置，针对发动机在冷起动测试中燃烧不稳定的问题，进行了发动机试验，研究了在不同点火能量下发动机冷起动测试时的燃烧情况。研究结果表明：随着点火能量的不断提高，点火火弧受气流的影响延伸发展的长度明显增长，发动机在冷起动时的燃烧速率有明显提升，燃烧过程中火焰发展期与主燃期之间存在相对良好的相关性，同时未完全燃烧循环和失火循环数明显减少，燃烧循环变动从14.85%减少到4.22%。由此可见，合理提高点火能量是提高燃烧稳定性的一个很有效的方法，高能量点火是未来发动机研究的一个重要方向。

Based on the self-built high-energy ignition device, the engine test was carried out to analyze the cause of unstable combustion of engine during the cold start test and the combustion conditions were studied under different ignition energy. The results show that the stretching length of spark flame arc greatly increases due to the airflow influence and the combustion rate of engine obviously improves with the continuous increase of ignition energy. There is a relatively good correlation between the duration and main combustion period. The number of incomplete combustion cycles and misfire cycles significantly reduces and the cyclic variation reduces from 14.85% to 4.22%. Accordingly, increasing the ignition energy is the effective method to improve the combustion stability and highenergy ignition will be an important research subject for internal combustion engines in the future.