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研究了电控单点汽油喷射发动机中空燃比、点火正时、喷油间隔、喷油定时、进气系统和发动机的负荷对排放的影响。试验结果表明：上述因素对发动机排放都具有明显的影响，但在均质混合气燃烧过程中，空燃比和点大提前角是影响发动机排放的最主要因素，而其它因素则是通过影响空燃比或点火提前角来间接地影响发动机的排放。
The effects of air-fuel ratio, ignition timing, injection interval, fuel injection timing, intake system and engine load on the emission of an electronically controlled single-point gasoline injection engine were studied. The experimental results show that the above factors have a significant impact on engine emissions. However, in the process of homogeneous mixture combustion, the air-fuel ratio and the point advancing angle are the most important factors that affect the engine emissions. Other factors are the effects of the air-fuel ratio Or ignition timing to indirectly affect the engine emissions.