Electric single pump has become an important choice for domestic car
June 21 08:06:33, 2024
Electric single-cell pump Electric single-unit pump Features Single-cylinder electric pump injection pressure high, up to 200MPa; reliability, durability; injection system (including monomer pump, ECU, conventional nozzle, high pressure tubing) , The total cost of the engine is low; the injection pressure varies with the engine speed load; the injection law is the triangle that is delayed first and then the urgency, which is better matched with the combustion system of the engine and helps to reduce the emission of NOx; To achieve pre-spray; to Europe â…¢ emissions, coupled with electronic fuel injector can reach Europe â…£. The application of electric control unit pump is mainly for medium and heavy-duty diesel engines. It can also be used for light-duty vehicles, pickup trucks, etc. Single-cylinder power range: 20 ~ 70kW. Electronic control unit pump applications Electric control expert based on electronic control unit pump fuel injection system diesel engine research, the use of interrupted ring pre-injection control algorithm to achieve, through the DDC2000 electric single-cylinder pump diesel engine installed cylinder pressure sensor and Fuel nozzle pressure sensor test. The results show that, in the single pump fuel injection system, the appropriate control algorithm and actuator drive can achieve good pre-injection and achieve good results. Independent of the hardware platform, this algorithm can be used for the injection control of electronically controlled single-block diesel engines and common-rail diesel engines. An instant, the country â…¢ emission standards have been officially implemented more than two months. Although the commercial vehicle industry is still debating the country's choice of what technology route to choose from, the market is waiting for everyone. Customers are making their own judgments and choices. From the first month after the implementation of the country â…¢ that is, in July the heavy truck sales data, in July the heavy truck industry sales of 28,916 units, 51.06% plunge in June than before the implementation. Among them, the sales volume of FAW and Dongfeng that took conventional emission control technologies (mainly common-rail high-voltage common rail technology) dropped by 70% MoM in July, much larger than that of the industry; while taking the unconventional technical route (H + EGR technology) Of China's heavy truck sales in July also fell 35.18% MoM, but the decline was only half of FAW and Dongfeng, its sales of 5970 units the month, ranking from the third in June to resume in 2007 the industry first. It seems that what kind of technology route is indeed worth the commercial vehicle companies, especially medium and heavy truck enterprises pondering the issue. In fact, after more than six months of controversy, even commercial vehicle users in the commercial vehicle sector have become quite familiar with common rail technology and EGR technology. Common rail technology is not only advanced but also mature, which is most conducive to future emission upgrades. However, due to the fact that the technology is almost completely monopolized by multinational corporations such as Bosch, its high cost and its sensitivity to oil, insufficient capacity and maintenance Service inconvenience and expensive, so in a certain period of time Chinese customers a bit prohibitive should be reasonable. EGR technology because it was eliminated by developed countries such as Europe and the United States, the future emissions standards upgrade is very difficult, in particular, the engine of this technology can be installed through the "failure" device, effective in government testing, and failure in peacetime, it is subject to domestic FAW Of course, commercial vehicles such as Dongfeng doubt is not surprising. However, due to the low cost of the technology, insensitivity to oil products, and the ease of maintenance services, it is also reasonable to be welcomed by customers as a transitional solution in the short term. However, it is puzzling that the focus of the current industry debate is mainly focused on "electric high pressure common rail injection" and "H pump + EGR" two major technologies, and few people talked about the European commercial giants to achieve Europe â…¢ , And even the mainstream technology of Europe â…£ - electric single pump. According to statistics, more than 85% of the heavy duty diesel engines in the European market are powered by electric single pump technology. The technical engine fuel injection per cylinder is accomplished by a separate injection unit. Between the single pump and injector using high-pressure tubing connection. Diesel oil is supplied to the fuel injector by an electromagnetic controlled oil spill valve by being placed in a single pump body. The ECU receives and processes the engine operating parameter information from each sensor and compares it with the stored optimum to control the fuel injection timing and fuel injection quantity. Its maximum injection pressure can now reach 2000 bar or higher. Electronic control combined pump is a combination of electric control unit pump type, its working principle is basically the same with the electric control unit pump. Because the electronic control unit pump is equipped with a high pressure pump for each cylinder of the engine, its biggest advantage is its relatively simple structure, less modification to the prototype engine, reliable performance, low failure rate, long service life and easy maintenance. In addition, the monomer pump is less sensitive to the cleanliness of the oil, especially because of the large injection pressure, the sensitivity of the high-power diesel engine is relatively weaker. In the current domestic oil quality can not meet the requirements of the conditions, the use of monomer pump technology, the advantages of self-evident. Of course, compared with the high-pressure common rail system, the electric control unit pump also has shortcomings, mainly due to the inability to freely control the fuel injection pressure and the low speed performance of the diesel engine. The good news is that at present in China, Chengdu Witt and ASIMCO Nanyue two companies have completely mastered and mastered all the challenges of the monomer pump technology, allegedly developed their own innovative products - electric control combined pump has been covered by heavy , Medium and light all commercial diesel vehicles supporting, and its product price is currently only electronically controlled high pressure common rail injection system half; At the same time, FAW and Dongfeng two leading enterprises belonging to the engine company has also entered the monomer pump technology The final stage of research, is expected to launch their products in the first half of 2009. It is predicted that the domestic electric control combination pump products represented by Chengdu Witt and ASIMCO Nanyue will be capable of producing sets of production capacity in the coming year and the price will drop to 35% -45 of the common rail system %. According to the analysis, I believe that the electric control monomer pump is suitable for China's national strategy to respond to the country car â…¢ technology route an important choice, that the best choice is not an exaggeration. Preliminary estimates, the end of this year, the domestic fuel injection system market, the common rail system will account for 60%, single pump and inline pump + EGR each 20%; mid-2009, the three technologies will each account for one-third However, by the end of 2009, the unit pump will have risen to 40% or more, while the common rail system and inline pump + EGR will each fall below 30%.