Do you have any understanding of fuel injectors? Today, we will conduct an in-depth analysis of the functions and characteristics of fuel injectors for you. The fuel injector, a highly precise device, requires extremely high precision in production and processing. Meanwhile, it also needs to possess a wide dynamic flow range, excellent anti-clogging and anti-pollution performance, as well as superior atomization effect. Next, let's explore the mysteries of fuel injectors together.
Introduction to Fuel Injectors:
In the common rail system, the electronically controlled fuel injector is undoubtedly the most crucial and complex component, with the highest design and processing difficulties. Through the precise on-off control of the solenoid valve, the electronic control unit can accurately inject the fuel in the high-pressure rail into the combustion chamber at the optimal injection timing, injection quantity, and injection rate. To achieve the precise starting point and quantity control of fuel injection, the common rail system adopts a special fuel injector. This kind of fuel injector is equipped with a hydraulic servo system and electronic regulating elements (i.e., solenoid valves), and it is composed of parts such as the orifice fuel injector, hydraulic servo system (including regulating pistons, regulating orifices, etc.), and solenoid valves. Its structure is quite similar to that of traditional fuel injectors.
Detailed Explanation of Fuel Injector Functions:
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Increase fuel pressure (to a constant pressure state): It can increase the injection pressure to 10 to 20 megapascals.
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Control injection timing: Start injecting fuel at the predetermined time point and stop it at the appropriate time.
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Regulate fuel injection quantity: According to the real-time working conditions of the diesel engine, adjust the fuel injection quantity to control the rotational speed and output power of the diesel engine.
Introduction to the Classification of Fuel Injectors:
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Axial solenoid fuel injector: During the injection process, the armature drives the needle valve to rise about 0.1 millimeter from its seat surface, and then the fuel is sprayed out from this precise gap. To ensure sufficient atomization of the fuel, a section of injection spindle needle is specially designed at the front end of the needle valve. The suction and release time of this kind of fuel injector is about 1 to 1.5 milliseconds.
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Ball valve type solenoid injector: Its needle valve has a light mass and a large spring preload, so it can provide a wider dynamic flow range. The ball valve has an automatic centering function, ensuring good sealing performance. Meanwhile, its simplified metering part structure helps to improve the injection accuracy.
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Valve type solenoid fuel injector: Combining the design of the light valve disc and the hole valve seat, as well as the magnetically optimized fuel injector assembly, makes this kind of fuel injector not only have a large dynamic flow range but also excellent anti-clogging ability.
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Low fuel inlet fuel injector: Adopting the bottom fuel supply method, since the fuel can continuously flow out from the upper part of the inner cavity of the fuel injector and circulate around the valve seat area, the cooling effect at the metering part of the fuel injector is very remarkable. This design effectively avoids the phenomenon of vapor lock and improves the reliability of the vehicle's hot start. In addition, the bottom-injection fuel injector can also omit the fuel manifold, thus reducing costs.
Through the above introduction, we hope that you have a deeper understanding of fuel injectors. If you are eager for more related knowledge, please follow our website.