Custom Quality Cummins Auto Vehicle Engine Spare Parts Factory Price
Cummins Auto Vehicle Engine Spare Parts
An engine is a device that converts chemical energy into mechanical energy through combustion. The key of an engine is to realize efficient combustion by organizing oil and gas, so as to obtain good economic and dynamic performance. At the same time, good exhaust emission can be achieved through certain means.
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The fuel system is the key part of the engine which is responsible for the oil supply. There are three types of electronically controlled fuel systems: electronically controlled high pressure common rail, electronically controlled single pump, electronically controlled pump nozzle. After years of survival of the fittest, the current electronic fuel system on the market is basically electronic control of high pressure common rail. High pressure common rail system mainly consists of three key parts: fuel injection pump, common rail pipe and fuel injector, the key technology is: on the one hand to achieve accurate injection control, on the other hand to ensure the reliability of the system under extremely high pressure.
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The combustion process requires the fuel system to achieve multiple fuel injection, including pre-injection, main injection and post-injection. The pre-injection is to reduce noise, the post-injection is to improve the exhaust temperature to meet the emission needs, and the main injection is for combustion work. The amount of oil injected per injection is small, up to 1mg. To meet this requirement, the injection injector needle valve and needle body fit gap at 1 micron level. At present, the new products of domestic diesel engines are mainly 5 times of injection, including 2 times of pre-injection, 1 time of main injection and 2 times of post-injection. The world's more advanced fuel systems can achieve up to eight injection, including three pre-injection, one main injection and four rear injection.
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For example, the rated speed of a 4-stroke diesel engine is 3000rpm, corresponding to 1500 times of combustion per cylinder /min, and 8 times of injection fuel system can achieve 12000 times of injection per minute. In order to achieve such a high frequency of injection times and high precision of injection oil volume, the precision coupling parts with minimal clearance need to be matched first, then the parts need to have high wear resistance, and finally the injection pressure needs to be increased to shorten the injection period.
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The rail pressure of fuel system is getting higher and higher with the technological progress. At present, the rail pressure of new diesel engine products in China is around 1800bar, while the rail pressure of more advanced fuel system in the world has reached 2500bar. 2500 atmospheres of pressure, in such a high pressure if you should ensure that the parts keep durable and reliable, at the same time deliver no fuel leakage, you should ensure strict requirements on parts materials, processing technology, sealing structure.
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