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为了确保柴油机的性能,要求各工况下喷油嘴按最佳时刻开始喷油,但柴油机不同转速喷油过程中,喷油嘴被压力燃油所打开的时刻是变化的。这是因为燃油压力波以音速在高压油管中传递前进,前进所需的时间与转速无关,而是个常数。即以柴油机的活塞上死点位置为基准,柴油机高转速时,喷油嘴开启的时刻比低转速时要晚一些。所以要使用自动供油提前器,以使喷油泵的供油起始
In order to ensure the performance of the diesel engine, it is required that the fuel injection nozzle start to inject fuel at the best time in each condition, but the time when the fuel injection nozzle is opened by the pressure fuel is changed during the injection process of the diesel engine at different rotational speeds. This is because the fuel pressure wave is transmitted at a high velocity in a sonic tube and the time required for the advance is independent of the speed and constant. That is, the piston on the dead center position of the diesel engine as a benchmark, diesel engine high speed, the nozzle opening time than when the lower speed. So to use automatic fuel advance, so that fuel injection pump start