The results show that, double injection system can get high replacement ratio of coal liquids fuel and good operation performance of the engine.

试验表明，采用此方法，可获得较高的煤液化燃料的代用率，发动机工作性能良好。

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Electric fuel pump is an important part of automobile fuel feed system, which absorbs fuel from fuel tank and provide it to the air crocks of engine by fuel injection.

电动燃油泵是汽车燃油供给系统的重要组成部分，其功用是将燃油从油箱内泵出并通过喷油器供给发动机各个气缸。

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In this paper, six wavelet functions were selected for the analysis of time-frequency characteristics of the pressure wave signal in fuel injection system of a diesel engine.

通过选用六种不同的小波函数，对柴油机喷油系统压力波信号的时频特性进行了小波分析研究。

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