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Bosch Denso Injection System Parts
In the past, carburetors were widely used in automobile engines because of their simple structure, convenient use and low cost. However, the carburetor engine has uneven fuel distribution, and the emission pollution is more serious than the gasoline injection system, which cannot meet the requirements of further improvement of the performance of modern engines, so the carburetor has been eliminated. At present, more and more car engines use gasoline injection mixture formation, has successfully replaced the carburetor fuel supply system, become the engine fuel supply system mainstream.
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It features no narrow pipes in inlet pipe, small air flow resistance, good inflatable performance and high output power as well as great mixture distribution uniformity. Gasoline injection system is not like a carburetor which will leave a layer of oil film in inlet pipe, it also has certain benefits to reduce fuel consumption. Application of gasoline injection system on engine has a variety of forms, can be classified according to different forms. According to the different actuators of the injection system, it can be divided into: 1. Multi-point injection system: An oil injector is installed on each cylinder to spray fuel directly in front of the intake valve of each cylinder port.2. Single point injection system: An injector supplies oil to more than two cylinders. The injector is installed in the section at the throttle gate, and the fuel is injected into the intake pipe with air.
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According to the form of the injection control device, it can be divided into: mechanical. Fuel metering is achieved by mechanical transmission and hydraulic transmission. Electronic control type: fuel metering is electronic control unit and electromagnetic injector. Electromechanical hybrid control type: assisted by mechanical and hydraulic control injection, but it also has an electronic control unit, multiple sensors and electrohydraulic regulator mixture, helping improve flexibility.
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According to the different injection position, it can be divided into: inlet injection and in-cylinder injection. Inlet injection can use low pressure injection device, which is the commonly used injection method. Direct injection in the cylinder is to spray fuel directly into the cylinder, which requires a high pressure injection device of 3.0~ 4.0mpa, which is of high cost, and requires that the ejected fuel can be distributed to the entire combustion chamber along with the airflow. The layout of the injector and the organization of airflow movement in the cylinder are relatively complex. However, the application of in-cylinder direct injection technology makes the engine more prominent in terms of fuel economy. Generally speaking, according to demand distribution, no waste of fuel is also the most widely used and most popular injection technology in the market at present.
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