The working principle of the fuel injector for Marine diesel engine parts

The working principle of the fuel injector is to achieve precise fuel injection through electromagnetic control. In a diesel engine, pure air is drawn in during the intake stroke. When the compression stroke is approaching its end, the diesel oil pressurized by the fuel injection pump is injected into the cylinder through the fuel injector to mix with the high-temperature air. The fuel injector itself is equivalent to an electromagnetic valve. When powered on, the electromagnetic force attracts the armature and needle valve to start fuel injection. When powered off, the spray hole is closed under the action of the reset spring to stop fuel injection. Its power-on and power-off are controlled by the electrical control unit through electrical pulses, thereby precisely regulating the fuel injection volume and assisting in the formation and combustion of the mixture.

Specifically, the fuel injectors of a common diesel engine are driven by the engine camshaft. During this process, a high-pressure fuel pump is used to deliver fuel, providing the necessary fuel pressure foundation for the operation of the fuel injectors.