为确保柴油机的性能,要求各工况下喷油嘴按最佳时刻开始喷油,相对应曲轴转角即为喷油开始角,与此相对应的喷油泵柱塞遮住进回油孔的几何位置,即为供油开始角。 如果供油开始角固定不变,在以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 In order to ensure the performance of the diesel engine, it is required that the injector should start injecting oil at the best time under each operating condition, and the corresponding crankshaft rotation angle corresponds to the injection start angle. Correspondingly, the geometry of the injector plunger obstructing the oil return hole Location, is the starting angle of fuel supply. If the starting angle of the fuel supply is fixed, the timing at which the fuel injector is opened by the pressurized fuel varies during fuel injection at different speeds. This is because the fuel pressure wave at the speed of sound