Based on the analyzing modalities of faults and fuel pressure waveform from injection line, a research on diagnosis strategy of fuel injection system is given.

通过分析柴油机燃油供给系统的故障表现形式及高压油管的油压波形特征，研究了柴油机燃油供给系统的故障诊断策略。

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The results show that at the same fuel delivery advance angle, engine speed and load, the line peak pressure and rate of pressure increment and decrement of DME are lower than that of diesel fuel.

试验结果表明：在供油提前角、转速和负荷相同的情况下，燃用二甲醚时油管泵端和嘴端压力的上升和下降速度、压力峰值都比燃用柴油时低；

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Additionally, compared with diesel fuel, D40 has a lower line pressure, higher pressure fluctuations and has a pump side residual pressure.

与柴油机相比较，D 40最高油管压力下降，油管压力波动幅值较大，具有较高的泵端残余压力。

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