HS code categorization for finished goods

Engine Fuel Injector is HS code categorization for finished goodsone of the most important components in the gasoline engine fuel supply system. In a car engine, the fuel needs to be sent into the cylinder through the fuel injector, mixed with air in the combustion chamber, and release energy after ignition to drive the car.Therefore, the quality and performance of the engine fuel injectoute are related to the power and fuel efficiency of the car. This article will comprehensively introduce the working principle, type, fault cause and maintenance of the engine fuel injector from many aspects to help you better understand and maintain the engine fuel injector. I. The working principle of the engine fuel injector. The working principle of the engine fuel injector adopts the method of electrical appliances to control fuel injection. When the engine is working, the car computer sets the fuel supply of the fuel injector according to the measured engine load and correction coefficient and the driver's pedal input. The solenoid valve on the engine fuel injector will open and close according to the instructions, spraying controllable gasoline fuel into the cylinder, or spraying gasoline on the throttle to form atomized fuel, so that the engine can work normally. II. The types of engine fuel injectors are according to the application.Unlike the working principle, the engine fuel injector is divided into two types: multi-point injection system and direct injection system. 1. The multi-point injection system multi-point injection nozzle makes the gasoline spray evenly distributed in the intake manifold of each cylinder. This kind of fuel injector is composed of electromagnetic and mechanical units. Its main feature is the working principle of the valve type, which can form high-speed fuel at the fuel injector and disperse into some tiny particles attached to the airflow and scattered into each cylinder, thus making the oxygen-fuel ratio of each cylinder uniform. The multi-point injection system is widely used in vehicle engines. Two. Direct injection system Direct injection nozzle is a kind of high-pressure premixed fuel injection system. This kind of fuel injector can inject fuel directly into the combustion chamber, so as to achieve the goal of efficient combustion and high-performance vehicles. Direct injection nozzles are mainly divided into the following categories: (1) The one-way fuel injector is often used for low-power engines. Based on the working principle of the one-way valve, its fuel injection volume is directly adjusted by the car computer according to the engine load state, and the fuel can be atomized or liquidized into the cylinder. ( 2) Due to its compact structure and does not require too much space in the installation of the hydraulic oscillator fuel injector, it can be very suitable for in-line four-cylinder engines. It is characterized by the control of the electronic control system, which further realizes the switching control of the solenoid valve. ( 3) The pressure-enhanced fuel injector is widely used in high-power engines. It is characterized by the use of compressed air higher than the fuel pressure to spray foggy liquid fuel, thus achieving high-efficiency and efficient additional fuel. Relatively speaking, the price of pressure-enhanced fuel injector is relatively expensive, but it can expand the fuel injection volume of the fuel injector, and the fuel dispersion and fuel injection controllability are relatively ideal.III. The cause of the failure of the engine fuel injector is due to the different environment and working conditions used by the car, and there are huge differences between different brands, different manufacturers and models, so the fault causes and fault forms of the fuel injector are also different. To sum up, for most faults, they can be roughly summarized as follows: 1. If the electrical signal is out of tune or missing, if the current is unstable, the solenoid valve tube is aging or the solenoid valve is damaged, it will cause the engine fuel injector to fail. Two. Oil pipeline blockage or reading failure faulty oil pump, damaged oil pipe, fuel precipitation, corrosion and broken oil pump hose or stagnant oil pressure valve, etc. may cause blockage or reading failure of the oil channel of the fuel injector. 3. If the mechanical parts are damaged or the screw slide is unstable, if the spring of the fuel injector is loose or bent, and the fuel nozzle piston is damaged or stuck, it will cause the fuel injector to work irregularly.Four. Damage to the shape of the fuel injector When starting, accelerating or stopping frequently, the car may cause damage to the shape of the fuel injector. IV. Maintenance of the engine fuel injector. Legal maintenance is the obligation that the owner must abide by. Regular maintenance of your engine fuel injector is conducive to maintaining its correct working method, so as to extend its service life. The following is the maintenance guide for the engine fuel injector: 1. Cleaning In order to ensure that the oil line of the engine fuel injector is unobstructed, the fuel injector can be cleaned regularly, and the cleaning cycle is generally once every 60,000 kilometers. The formula of the cleaning solution should help dissolve or remove debris and carbon accumulated in the oil channel. Two. Use appropriate fuel and consumer brand gasoline that guarantees quality and stability to avoid the accumulation of sediment and the variation of emission components. 3. Replacing the air filter engine requires good air inflow to ensure the normal and effective operation of the accelerator, otherwise it will affect the operation of the engine fuel injector.Four. Check the fuel filter and use a high-quality fuel filter to check it regularly to ensure the normal start and use of the engine fuel injector. 5. Pay attention to maintain the normal driving mode, do not refuel or step on the brake wildly, and follow the specified engine power coefficient and maximum use load design requirements. Conclusion As an important component widely used in automobile engines, the quality and performance of the engine fuel injector have a direct impact on the fuel efficiency and power of the automobile. Therefore, sufficient attention should be paid to the working principle, type, fault cause and maintenance of the engine fuel injector. Consumers need to choose suitable brands and manufacturers through regular channels, and pay attention to the maintenance of various auto parts, so as to improve the performance of the car and extend its service life.

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