Five Questions and Five Answers Let You Understand Yan Chai Jing V and Te Jing V
On June 29th, 2015, Weichai and Fukuda Daimler officially launched the new Beijing V engine and the Tejing V engine that separately meets the city's eight categories of vehicles in Beijing. As the first engine company to launch comprehensive response products since Beijing officially introduced the Beijing V emission standard, Weichai has set an industry benchmark for comprehensively meeting the Beijing-Tianjin-Hebei region's emission standards and enhancing the urban environmental protection index. Since June 1, 2015, Beijing has been leading the fifth phase of heavy-duty diesel vehicles (ie Beijing V emission standards). The standard raises the limits of nitrogen oxide emissions and particulate emissions, and adds new indicators for pollutant control. The new target has imposed higher requirements on the limitation of the number of particulate matter. Among them, Tejing V also needs to install a DPF (wall flow particle trap) with higher purification efficiency. It is understood that Beijing V and Tejing V will eventually achieve about a 40% drop in the emission of nitrogen oxides from bicycles, which will effectively reduce the atmospheric pollution of heavy-duty diesel vehicle exhaust. In this regard, China Truck Network interviewed the relevant person in charge of Weichai. From the following dialogue, we may be able to more clearly understand the technical characteristics of Weichai's Beijing V and Tejing V products. 1. What are the external appearance changes made by Yantai Diesel V and Tejing V compared to the National IV engine? A: Weichai's ordinary Beijing Five engine has no difference with the National IV engine body. Compared with the National IV engine body, the Beijing V engine has increased the intake throttle valve that can increase the exhaust temperature. 2. Instead of adopting common EGR technology, Teking V uses DOC+PDF technology. Can you analyze the differences and advantages of these two technical routes? A: Tejing V is developed for urban areas with eight types of vehicles in Beijing, mainly to meet the requirements of particulate emissions, while the main function of EGR is to reduce nitrogen oxides and counteract the reduction of particulate matter, so we It is not used. The main role of the DOC+DPF technology route is to reduce particulate emissions through the catalytic conversion and capture of particles, so the latter is more necessary during the Beijing Five period. 3. What care should be paid to the maintenance of Beijing V and Tejing V? A: Whether it is an SCR system or a DPF system, both need to operate within a specific temperature range. Unlike the SCR system, DPF will leave some residual impurities during the regeneration process. Therefore, as long as ordinary Beijing V well exhaust pipe and post-processing system insulation can be done in addition to the conventional insulation of the Beijing Special V work in accordance with the operating manual DPF service regeneration ash removal work. 4. Describe CR+WGT+SCR+ASC and TV+CR+DOC+DPF+SCR+ASC, respectively. A: CR+WGT+SCR+ASC refers to high pressure common rail + air vent valve supercharger + catalytic muffler + ammonia trap. The high-pressure common rail can provide a stable fuel supply pressure to make the fuel supply more accurate. It is beneficial to the engine's emission control and combustion heat management. The bleeder valve supercharger can be in the engine compared to a conventional supercharger. In the middle and low speed operation, it can play a better role in boosting the intake air pressure. It can comprehensively take into account the power and economy of the engine at medium, high and low speeds. The catalytic muffler is used to remove the nitrogen oxides and noise from the exhaust gas. The ammonia trap can effectively remove the ammonia gas in the tail gas leaked due to excessive urea injection or incomplete chemical reaction. TV+CR+DOC+DPF+SCR+ASC is an air intake throttle valve+high pressure common rail+catalytic oxidizer+particle trap+catalytic muffler+ammonia trap, which differs from Putin 5 in that it adds intake air Throttle valve. The air intake throttle valve is mainly used to regulate the thermal management of the engine, and is mainly used to raise and lower the temperature. It is not only beneficial to the improvement of the SCR low temperature reduction efficiency, but also can guarantee the temperature of the passive regeneration and active regeneration of the DPF. Catalytic oxidizer is mainly used for CH (DPF passively regenerated catalyst) to increase temperature after spraying and adjust NO/NO2 ratio, which can provide conditions for DPF regeneration. DPF mainly captures soot components in exhaust gas. Several kinds of post-processing coordination and the use of engine thermal management and electronic control can achieve good results, and they are indispensable. 5. What are the characteristics of the engine reprocessing of Weichai Jingwu? 1) For Beijing Five, Weichai adopts a low-temperature extrusion catalyst to optimize the design of the mixer and improve the uniformity of urea mixing and the utilization of urea to meet WHTC emission requirements. 2) For DOC+DPF+SCR integrated design of Teking 5 and Weichai, the matching and maintenance are convenient; the unique thermal management technology is not only beneficial to the improvement of SCR reduction efficiency in urban cryogenic working conditions, but also conducive to passive regeneration of DPF. control. The combination of DPF passive regeneration and active service regeneration is more safe and energy-saving. According to the reporter of the China Trucking Network, Weichai’s State V technology reserves have been researched as early as 2010. In 2012, it began to do research on Euro VI. In 2014, it had won the product certification of vca Euro VI. With the above accumulation and R&D strength, when the market has demand, Weichai can respond quickly. Metal Bearings ,White Metal Bearing,Metal Ball Bearings,Precision Steel Balls Ningbo Metal Sharing Supply Chain Management Co., Ltd , https://www.sheetsharing.com