为控制混合气形成，开发了一台混合气喷射汽油机。这台发动机在气缸盖上具有一个小的混合室和驱动混合气喷射阀的机构。利用荧光技术获得液相和气相燃料的分布状态，通过影象处理技术计算出缸内流场的图象，从进气行程到压缩行程，混合气都喷射到涡流中心，并且在压缩行程的末端靠近火花塞处形成高浓度的燃料蒸气区域。混合气形成层状分布对稀混合气燃烧的稳定性是有效的，已证明该机稀燃极限可高达４０。 To control the formation of the mixture, a gas-jet gasoline engine was developed. This engine has a small mixing chamber on the cylinder head and a mechanism that drives the gas injection valve. Fluorescence is used to obtain the distribution of liquid and gaseous fuels. The image of the flow field in the cylinder is calculated using image processing techniques. From the intake stroke to the compression stroke, the mixture is injected into the center of the vortex and at the end of the compression stroke Close to the spark plug to form a high concentration of fuel vapor region. The formation of stratified mixture is effective for the stability of lean mixture combustion, and it has been proved that the lean burn limit of the mixture can reach as high as 40%.