What is the principle of a fuel injector?
1 Answers
High pressure is generated inside the fuel injector body and acts on the conical surface of the nozzle. When the oil pressure exceeds the set value, the nozzle valve core opens, and high-pressure oil is sprayed out from the small holes of the nozzle in a mist form into the engine cylinder for combustion, causing the piston to reciprocate. The classification of fuel injectors is introduced as follows: Pintle-type electromagnetic fuel injector: During injection, the armature drives the needle valve to rise about 0.1mm from its seat, and fuel is sprayed out from the precise gap. To ensure full atomization of the fuel, a spray pintle is ground at the front end of the needle valve. The actuation and descent time of the injector is about 1 to 1.5ms. Ball-type electromagnetic fuel injector: The valve needle of the ball valve is lightweight, and the spring preload is large, allowing for a wider dynamic flow range. The ball valve has a self-centering effect and good sealing performance. At the same time, the ball valve simplifies the structure of the metering part, helping to improve the accuracy of fuel injection.