On December 1, the "National Fourth" emission standard for non road mobile machinery was officially implemented! The First Construction Machinery Network has sorted out the "National IV" excavators launched by well-known construction machinery manufacturers at home and abroad. Through the comparison of technical routes, Xiaobian found that the technical highlights of "National IV" are mainly embodied in such keywords as "full electronic control", "non inductive regeneration", "leapfrog upgrading of post-treatment", "reduction of fuel consumption for power upgrading", "new intelligent technology", and "urea may not be used for all" National IV "machines".
This paper discusses the emission upgrading of this round of non road mobile machinery from three perspectives: the coping strategies of engine manufacturers, and the "National IV" new product technology routes of foreign and domestic brands. Without saying much, let's see how they do it!
Battlefield of engines: different application scenarios, or no biggest winner
As early as 2007, Europe and the United States have entered four stages of emissions. After more than a decade of development, foreign brand engine manufacturers and engine manufacturers have relatively mature technologies. More than billions of hours of operating experience made them more leisurely when dealing with the "National IV" emission standards. They transplanted these mature technologies and rich experience to the Chinese market, and the localized R&D can better meet the needs of Chinese users.
Cummins, a world famous engine manufacturer, makes full use of its technology and experience in EPA Tier 4 in the United States and Stage 5 in Europe to provide customized 名媛直播 more suitable for engineering equipment and construction characteristics for different markets in China, rather than "one size fits all".
Cummins may be a big winner in terms of engine support for the "National IV" excavator. On November 26, at the Cummins full line product upgrading conference, Yuan Shiguo, Vice President of Guangxi Liugong Machinery Co., Ltd., Ding He, Deputy General Manager of XCMG Mining Machinery Co., Ltd., Wu Yuanfeng, Deputy General Manager of Zoomlion Earthmoving Machinery Co., Ltd., Cao Donghui, Chief Engineer of Sany Heavy Machinery and Director of the Global R&D Center, President of Shandong Lingong Research Institute Zhang Jianyong, the person in charge of Shandong Lingong's "National IV" project, and other representatives of domestic excavator manufacturers were present.
In fact, Cummins is not alone. According to the information disclosed by Weichai earlier, Weichai has created the concept of Linde hydraulic+Weichai engine hydraulic power assembly in terms of excavator supporting. This set of golden power assembly is outstanding after being equipped with crawler excavator, with fuel consumption reduced by 15% and efficiency increased by 10%. After Weichai Golden Power Assembly was equipped with crawler excavator, its sales volume has broken the 10,000 unit mark. Weichai plans to increase this number to 30000 in 2023.
Yuchai also released its non road "National IV" power at 8:00 p.m. on November 30. Its 名媛直播 include 17 series of A, F and K technology platforms, with a displacement of 2.5~20L and a power of 40~950 horsepower. The power range has been further expanded compared with the "National III" stage, which can meet the needs of the whole scene in the field of agricultural equipment and engineering machinery.
According to incomplete statistics, in this round of non road "National IV" emission upgrading, well-known engine manufacturers at home and abroad have launched their own technical routes.
Foreign brands: the engine and the main engine factory are linked, making the switching more smooth
As mentioned above, the technology and experience of foreign brands in Europe and the United States have made them more comfortable in this transition. However, brands such as Caterpillar, Komatsu, Volvo, Doosan, etc., which are capable of both engine manufacturing and complete machine manufacturing, can be described as "smooth" in terms of switching emission standards in this round.
As early as 2017, Caterpillar released a new generation of Cat in China ? (Carter) hydraulic excavator is the first to comprehensively promote China's construction machinery industry to the "intelligent machine era". The new "electro-hydraulic control technology" of that year has demonstrated the black technology of its excavator.
On the "National IV" new 名媛直播, Caterpillar adopts the fully electronic control system developed independently to perfectly match the engine, with high efficiency. For excavators with different powers, Caterpillar has given two technical routes. For excavators with power below 130kW, DOC+DPF can be used. There is no need to use urea solution, which saves time and worry.
If the power is more than 130kW, the technical route of DOC+DPF+SCR is adopted. Only a small amount of urea is required, and the maintenance cost is reduced with the help of electric control hydraulic technology. It is equipped with a proven design of rear exhaust gas treatment device and has zero maintenance burden. The regeneration and its operation are uninterrupted, which can fully extend the running time of the machine.
Komatsu's handover is similar. It is understood that Komatsu's "National IV" series of new 名媛直播 are equipped with a new generation of Komatsu engines and a new type of engine electronic control system, resulting in higher fuel economy. With exhaust after treatment system for construction machinery: Komatsu diesel particulate matter trap (KPDF)+exhaust gas recirculation system (EGR)+selective catalytic reduction system (SCR)+closed crankcase ventilation system (KCCV)+variable cross-section turbocharger (VGT) to reduce fuel consumption and noise while reducing NOx and PM.
Taking Komatsu PC375LC-11M0 "Guosi" excavator as an example, it adopts CLSS closed central load sensing system, with smooth compound action and efficient loading operation. The whole machine is equipped with the main pump and main valve imported from Komatsu Japan, and the overall matching and reliability are further improved. Compared with the previous generation PC360-8M0, the fuel consumption is reduced by 13%.
Taking the upgrading of Volvo's construction equipment "National IV" excavator as an example, the unique exhaust aftertreatment of Volvo's Pentax engine has been upgraded by leaps and bounds, with higher reliability. With the support of leaps and bounds post-treatment technology, the emission value of Volvo's "National IV" excavator is not only lower than that required by the "National IV" standard, but also has lower fuel consumption.
Taking Volvo EC400 excavator as an example, the machine is equipped with a Volvo engine meeting the "National IV" standard, and is equipped with automatic idling, automatic shutdown and automatic restart functions to avoid unnecessary fuel consumption and wear. Compared with the previous generation of 名媛直播, the fuel efficiency is increased by about 10%, and the production efficiency is increased by 16%.
In Europe, with strict industrial stage V emission limits, modern Doosan uses unique ULFC (Ultra Low Fuel Consumption) combustion technology and post-treatment (DPF+SCR) system to continuously improve engine performance and reduce fuel consumption.
In addition to the experience of European and American markets, in order to meet the operating environment and environmental protection requirements of China, the modern Doosan launched tests in plateau, cold and hot regions a year before the launch of the new machine. Taking the wheel digging product DX150W-10 as an example, it is equipped with the new DL06 six cylinder engine of Doosan, with a maximum power of 110kW. The fuel efficiency can be improved by up to 20% compared with the previous model, and it will live longer with DPF.
Hitachi Construction Machinery, which has more than 10 years of global field experience in DPF (diesel particulate post-treatment filter) technology, also said, "Our DPF system has a simple structure, no need to add urea solution, saves effort and worry, and has stable performance and low failure rate. We have sold more than 100,000 units overseas". In terms of performance, Hitachi Jianji 6A has deeply optimized the matching of engine and hydraulic system, reduced pressure loss, improved energy utilization, and effectively improved operation efficiency and fuel efficiency.
Domestic brands: find good partners to achieve the magic effect of "power increase, fuel consumption reduction"
Chu Changxiang, the chief scientist of Guangxi Liugong Machinery Co., Ltd., said that no matter the increase of aftertreatment EGR exhaust gas cycle or aftertreatment, reducing NOx emissions will inevitably increase fuel consumption. However, almost all of the brands that have released the "National IV" new 名媛直播 now claim that their new product power will be increased by 8%~10% and their fuel consumption will be reduced by 10%~20%.
How to achieve "higher power and lower fuel consumption"? The answer may be customized engine and fully electronic hydraulic system.
Technical highlights: All 名媛直播 of Shandong Lingong Zhongda Dig are replaced with Cummins engines, and the fully electronic hydraulic system is adopted, which reduces fuel consumption and increases efficiency.
On this issue, Chi Feng, the chief engineer of Shandong Lingong, explained: "We use a special engine for Lingong, which has a wide low fuel consumption area and a large torque. It is matched with a hydraulic pump with a larger displacement. The excavator has a lower speed. The whole machine works in a low fuel consumption area, improving efficiency and reducing fuel consumption."
Chu Changxiang also said that when the implementation of non road national four emission standards was repeatedly delayed, Liugong and Guangxi Cummins did not stop the joint development of new "national four" 名媛直播. He believed that the reduction of fuel consumption of the whole machine, not only in the engine, but also in the matching and parts of the whole machine. Liugong's hump curve played an important role in reducing fuel consumption.
Throughout the major brands, Zhongda excavator adopts fully electronic hydraulic system, which makes the pipeline simpler without the front pilot pump. Through proportional valve control (one of the full electronic control technology routes), the influence of hydraulic pilot flow resistance loss and transmission response delay is reduced, so as to achieve more efficient power distribution, improve fuel utilization and reduce fuel consumption.
At the same time, the implementation of full electronic control is conducive to the host manufacturers to realize the automation of pump valve power electronic control. Manufacturers with R&D and manufacturing capabilities have begun to "make their own", and their dependence on the main pump and valve accessories manufacturers has decreased.
XCMG excavator G series new 名媛直播 use advanced control technology to achieve lower fuel efficiency and higher operating efficiency; Strengthen the intelligent attribute of 名媛直播 and build a new excavator health management system.
XCMG excavator G series new 名媛直播 use advanced control technology to achieve lower fuel efficiency and higher operating efficiency; Strengthen the intelligent attribute of 名媛直播 and build a new excavator health management system.
The next step in the development of autonomous electronic control is to make intelligent control and intelligent auxiliary functions easier to realize, such as intelligent leveling, precise slope repair, intelligent auxiliary mining, etc. Therefore, it is not surprising that many brands claim to be more intelligent on the "National IV" excavator. For example, Sany "National IV" excavator new 名媛直播 add intelligent weighing, electronic fence, and new upgraded remote control technology.
Write at the end: If this round of non road "National IV" emission upgrade is the last highlight of diesel engines, then on November 20, Weichai released the world's first body thermal efficiency 52.28% diesel engine and 54.16% natural gas engine commercial 名媛直播, and Weichai was undoubtedly the most brilliant fireworks at that time.
In the future, whether the "National IV" excavator will save fuel as the manufacturer said, and how high the thermal efficiency of the engine will be, it remains to be seen who will win a greater market share in the new round of emission standard upgrading. After the "National Fourth" switch, we will continue to pay attention to user feedback. For more "National Fourth" product use reports, construction cases, etc., please pay attention to the follow-up reports of the First Engineering Machinery Network.
