The hottest stories about diesel engine technology

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Talking about the stories of diesel engine technology high pressure common rail technology Abstract: in the international environment, major international construction machinery manufacturers have already begun to face increasingly serious environmental protection problems and try to "cope with" the emission standards that are being raised every year. When imported, joint venture and domestic models sold domestically are launched against the trend to meet the market for "direct injection vehicles", Whether our construction machinery industry can develop healthily and long-term

since the development of diesel engine, it has been deeply integrated into my life. 7. User self-report function. Whether in the field of construction machinery and equipment we are engaged in, or in vehicles, ships and other fields, it has been widely used. The elasticity and flame retardancy of this material can be used to meet the requirements of pipeline products

and the fuel delivery technology of diesel engine has also developed from the early in-line pump fuel delivery system to today's electronically controlled fuel rail system. It not only eliminates the shortcomings of the old diesel engine, such as loud noise and black smoke, but also effectively reduces the environmental pollution caused by the diesel engine in the working process and protects the environment

nowadays, advanced electronically controlled diesel engines are used in the mainstream equipment of major construction machinery manufacturers, and have been optimized according to the specific use environment of the domestic market

the brands and types of electronic control engines used by manufacturers on the equipment are different, such as our common rail system and single pump system. What are the specific working principles of these systems and their own advantages and disadvantages? Today, I will bring you to talk about the electronically controlled diesel engine

in the era of direct injection of diesel engines

diesel engines were first developed and produced by rudolfdiesel. After continuous improvement and development of new technologies, they have gradually developed to today's advanced level

diesel engine has entered the era of direct injection since the beginning of the 20th century, and has entered a stage of rapid development. Diesel engine manufacturers began to focus on investment and research and development on how to improve the fuel efficiency and power performance of diesel engines, and have achieved rich technical accumulation, which has laid a good foundation for the development of diesel engine technology in the future

In 1908, prosperl 'orange cooperated with DEUTZ company to jointly develop the first high-pressure pump system that can accurately control the fuel injection volume and the injector with needle valve structure. This is also the prototype of diesel engine injector structure and high-pressure pump structure that we commonly use now

In 1919, Cummins developed its first diesel engine to replace labor to drive simple agricultural equipment

caterpillar has also developed diesel engines for its tractors since the 1930s to meet the growing market demand and keep up with the pace of changes in the times driven by scientific and technological progress

in the early stage of the outbreak of World War II, countries began to use diesel engines in a large number of military equipment such as tanks, aircraft and airships. Therefore, diesel engines entered the military field and are still the preferred power for the ground main combat equipment of the military of various countries

after the outbreak of World War II, in order to improve the strength of their military equipment, the participating countries began to produce a large number of diesel engines for driving weapons and equipment, which also stimulated the accumulation and development of diesel engine industrial technology

however, in order to meet the needs of war consumption, major manufacturers have made full efforts to ensure the needs of the front line, so the engines using new technologies have not been put into the actual production process, but remain on paper

in the late stage of World War II, with the continuous victory of the allies in various battlefields, the defeat of the axis countries was determined, and the changes in the production environment of various manufacturers made it possible for them to realize their idea of staying on paper at that time

In 1943, Cummins successfully developed the common rail system and obtained a patent

From 1976 to 1992, Cummins and the Federal Institute of technology in Zurich jointly developed a new generation of common rail injection system

in 1993, wo can be divided into mechanical dynamometer and electronic dynamometer. Erwo developed the unitinjector fuel system and took the lead in using it on its own truck

in 1994, Bosch successfully developed the diesel engine unitpump fuel system. Through the above introduction, we can learn that the fuel common rail system used in diesel engines used in construction machinery and other fields has been developed as early as the 1940s, and improved and perfected in the 1970s

however, limited by the development of electronic control technology at that time, and in the last century, people did not pay so much attention to energy, pollution and other issues as they do now, so the fuel common rail system has not been mass produced and promoted

high pressure common rail diesel direct injection technology

high pressure common rail diesel direct injection technology (CRDI). Robert Bosch Co., Ltd., Delphi Automotive Systems, electric equipment company, and Siemens VDO (now wholly owned by continental) are the main suppliers of modern common rail systems worldwide

the use of diesel common rail technology minimizes the vibration and noise generated by diesel engines, while further reducing fuel consumption, reducing the content of harmful particles in exhaust gas and reducing pollution

the biggest criticism of traditional diesel engines is that they have high noise and vibration during operation. The noise of diesel engine is mainly caused by the rapid combustion period during the combustion process of the engine. What directly affects the combustion stability in the fast burning period is the preparation period before the fast burning period, that is, from the time the fuel injector begins to inject into the cylinder to the time the fuel starts to burn

the traditional direct injection engine injector, after the high-pressure pump pressure is established and reaches the set pressure value of the injector, directly open the injector needle valve to inject all the fuel into the cylinder, resulting in high mixture concentration in the cylinder, resulting in rough engine operation during the fast burning period, which is often said to be noisy and "shivering"

in order to ensure that the high-pressure common rail system can be controlled efficiently and accurately, higher requirements are adopted for fuel and maintenance cycle, which makes the high-pressure common rail system look a little "delicate" in front of the highly adaptable direct injection system

in recent years, due to the impact of the oil crisis and escalating engine emission standards, major international manufacturers have gradually begun to equip their own equipment with diesel engines with electronic control systems to adapt to changes in policies and environmental standards. For example, domestic well-known imported excavator models, such as Caterpillar cat320d, Komatsu PC, Volvo ec240bp, Hitachi ZX, all use high-pressure common rail fuel system

these models are the main models of manufacturers in China and even the world. However, the problem limited to the quality of domestic oil products has led to the high failure rate of mechanical equipment using high-pressure common rail system among these major manufacturers, which makes the advantages of electronic control engine unable to be exerted, and makes the "EFI vehicle" cold in China

facing the situation of electronic control engine in the domestic market, caterpillar and Hitachi construction machinery quickly adjusted their strategies according to the needs of the Chinese market, and launched new modified models for the Chinese market, cat320d2 and Hitachi ZXG. The shoddy doors and windows further contributed to its rampage. Both of the two modified models adopted direct injection engines to deal with the quality problems of domestic fuel

however, in the international environment, major international construction machinery manufacturers have already begun to face increasingly serious environmental protection problems and try to "cope with" the emission standards that are being raised every year. I wonder whether our construction machinery industry can develop healthily and long-term when imported, joint venture and domestic models for domestic sales counter the trend and launch "direct injection vehicles" to meet the market. Let the decision-makers solve the problems

with the continuous progress of technology, it is believed that more advanced technologies will be applied to diesel engines and engineering machinery and equipment, so that the equipment can create more value

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