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将压缩天然气（ＣＮＧ）和液化石油气（ＬＰＧ）气体燃料用作发动机燃料，采用缸外预混合的供气方式，其发动机功率损失和动力性降低，已成为推广使用中的难题。吉林工业大学内燃机研究所采用喷射技术，电控技术和计算机模拟技术，对进气门处喷射和缸内喷射的ＣＮＧ和ＬＰＧ发动机在整机性能，特别是动力性以及燃烧特性方面与汽油机的对比进行了系统的研究。研究表明，充气系数降低是缸外预混合式天然气发动机功率下降的主要原因。缸内直接喷气可大幅度提高充气系数；采用缸内喷气技术可恢复天然气发动机功率；提高压缩比可以提高天然气和ＬＰＧ发动机的动力性和经济性，使功率下降得以部分补偿。研究成功了电控气体喷射器的驱动电路和高能点火系统驱动电路，解决了点燃式发动机强烈干扰问题。
Compressed natural gas (CNG) and liquefied petroleum gas (LPG) gas fuel as the engine fuel, the use of pre-mixed external gas supply, the engine power loss and reduced power, has become the promotion of the use of the problem. Jilin University of Technology Institute of Internal Combustion Engine using jet technology, electronic control technology and computer simulation of the intake valve at the injection and in-cylinder injection of CNG and LPG engine machine performance, especially the power and combustion characteristics compared with the gasoline engine Conducted a systematic study. The research shows that the decrease of the inflation coefficient is the main reason for the decline of the power of the pre-mixed natural gas engine. In-cylinder direct injection can greatly improve the inflation coefficient; the use of in-cylinder jet technology can recover the natural gas engine power; improve the compression ratio can improve the natural gas and LPG engine power and economy, so that the power down to be partially compensated. The successful research of the driving circuit of the electronically controlled gas injector and the driving circuit of the high-energy ignition system solves the problem of strong interference of the ignition type engine.