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Principle of fuel injector

The fuel injector is continuously applied to the fuel system pipe by means of high pressure through the fuel pump located in the fuel tank. The fuel injector at the end of the fuel system tube is an intake manifold, which operates from the nozzle at the end of the nozzle when the internal plunger is operated by an electrical input or when the fuel is opened at high pressure by a mechanical fuel injection pump. Fuel is sprayed near the air intake.

In the electronically controlled injector, determine the fuel that can be injected within one minute (can be distinguished by 300 cc/min and other values), and choose the best capacity injector according to the engine displacement and performance in the design. Similar to the main nozzle in a carburetor, the amount of injection specified is almost determined by the aperture of the nozzle tip, and the larger the aperture, the more fuel can be injected at the same fuel pressure. On the other hand, even if the nozzle hole diameter is the same, if the specified fuel pressure is different, the higher the fuel pressure, the more fuel can be injected.

The actual amount of fuel injected into the engine is controlled by the fuel injection rate per minute of the injector and the opening time of the valve, as well as the fuel pressure regulator. The basic injection time is determined by the amount of air intake measured by the air flowmeter, but in practice the engine fails when fuel levels suddenly increase due to abnormal operation of the accelerator. To increase this, an O 2 sensor located in the exhaust pipe is used to measure the air-fuel ratio and the valve opening time is corrected based on the measurement results to achieve high performance and low exhaust emissions.

fuel injector