What is the function of a fuel injector?
1 Answers
The function of a fuel injector is to precisely deliver fuel into the engine for combustion. A car fuel injector is a simple solenoid valve. When the electromagnetic coil is energized, it generates a magnetic force that lifts the needle valve, opening the injection hole. Fuel is then sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a fine mist that facilitates complete combustion. There are two types of fuel injection methods. One is called port fuel injection, where fuel is injected into the intake manifold, and the other is direct injection, where fuel is injected directly into the cylinder. Below are detailed introductions of these two injection methods: 1. Pressure: The structural principle of the fuel injector is the same, but the pressure it withstands differs. The fuel line pressure for port fuel injection is generally 2-8 kg, and the residual pressure after the engine is turned off is about 1 kg. This is also a parameter used to determine if there is an issue with the fuel line. In contrast, direct injection is a high-pressure injection, with fuel line pressure reaching 24-200 kg. 2. Advantages and disadvantages: Each method has its own pros and cons. Port fuel injection sprays fuel into the intake manifold, which then enters the engine through the intake valves. This method helps clean the intake valves, and the longer path allows for more complete combustion, reducing carbon deposits. However, the longer path can lead to less precise fuel delivery, resulting in increased fuel consumption and reduced power output.
