Heavy Truck Fuel Injector
The fuel injection system of a diesel engine atomizes the fuel and distributes it in the combustion chamber where it mixes with air.
Product number: 61560080276
Weichai Sinotruk MAN Cummins Shangchai Xichai Engine injector
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How the injector works:
The fuel injection system of a diesel engine atomizes the fuel and distributes it in the combustion chamber where it mixes with air. It is mainly composed of fuel injector and fuel injector body, and its installation position and angle on the cylinder head depend on the design of the combustion chamber. There are two types of injectors: open and closed. The open injector has a simple structure, but poor atomization, so it is rarely used. Closed injectors are widely used in various diesel engines. Diesel engines inhale pure air during the intake stroke.
When the compression stroke is near the end, the diesel oil will increase the oil pressure to above 100MPa through the fuel injection pump, and then spray into the cylinder through the fuel injector, and mix with the compressed high-temperature air in a short time to form a combustible mixture. Due to the high compression ratio of the diesel engine (generally 16-22), the air pressure in the cylinder can reach 3.5-4.5MPa at the end of the compression, and the temperature can reach as high as 750-1000K (while the gas mixture pressure of the gasoline engine at this time will be 0.6-1.2MPa , the temperature reaches 600-700K), which greatly exceeds the self-ignition temperature of diesel.
Therefore, after diesel is injected into the cylinder, it will ignite and burn by itself immediately after mixing with air in a short time. The air pressure in the cylinder rises rapidly to 6-9MPa, and the temperature also rises to 2000-2500K. Pushed by the high-pressure gas, the piston moves downward and drives the crankshaft to rotate to do work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe.
Types of injectors:
1.According to the structure of the injection port, it can be divided into various forms such as hole type, shaft needle type, and plate valve type;
2. According to the number of injection holes, there are single hole, double hole and multi-hole types. ;
3. According to the resistance value of the electromagnetic coil inside the injector, there are two types of low-resistance injectors and high-resistance injectors;
4. According to the application, it can be divided into MPI and SPI.
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