In order to reduce the noise of the engine, the electronic control unit of the engine can inject a small amount of diesel before the main injection event ("pilot" injection), thus reducing its explosiveness and vibration, and optimizing the injection time, fuel quality change, cold start and other times. Some advanced * * * rail fuel systems can perform up to five injections per stroke.
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* * * Rail fuel injection system is widely used. Bosch has produced 25 million sets of * * * rail systems, and invested in the construction of technical centers and factories in Wuxi, Jiangsu, realizing localized production.
Great Wall Motor and Bosch Company have developed * * rail high-pressure diesel engines, and other brands such as Audi, Mercedes-Benz and Huatai have also introduced * * rail system vehicles. Some domestic universities, research institutes and enterprises have also achieved distinctive research results through cooperation or independent research and development, and dozens of patents have been published.
Therefore, China has accumulated some experience in electronically controlled direct injection diesel engine, but there is still a gap with foreign countries in general, mainly reflected in the manufacturing process and quality control of mass production. In addition, the domestic supporting system of * * * rail system is not perfect, and some parts are imported, such as single chip microcomputer chip and * * * rail pressure sensor.
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