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Are you ready for the "National Five" era?

Public number: HeyCar Source: Time: 2020-02-21 02:06:30

Millennium Tongzhou vitality north stream

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The national fifth-phase motor vehicle pollutant emission standard, that is, the “national five standard”, the national five standard emission control level is equivalent to the European stage five emission standard. The European Union has been enforcing since 2009 and has imposed stricter restrictions on vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide and suspended particles. From China I to China IV, each time the standard is raised, the bicycle pollution is reduced by 30% to 50%.

The national five standards will be implemented nationwide in the fifth phase of national motor vehicle emission standards from January 1, 2018.

Cities such as Beijing, Shanghai, Nanjing, and some cities in Guangdong have begun to implement the national five standards.

From April 1, 2016, all imported, sold, and registered light gasoline vehicles, light diesel passenger cars, and heavy diesel vehicles (only for public transportation, sanitation, and postal use) in Beijing, Tianjin, and Hebei must comply with the motor vehicle emissions "National V "standard.

So which wide-body light passenger brands have national five models?

At present, wide-body light passengers on the market are: all models of SAIC Chase V80, JMC New Generation Transit, Nanjing Iveco, Dongfeng Yufeng, Fukuda Tuiano

Xiaobian simply did a finishing here

You can pay attention to the last item in the form, "Do you want to add urea?" Regarding the question of adding urea, we also mentioned it in the previous content.

Here I will briefly introduce for you

First of all, what is the urea solution for cars?

The urea solution for vehicles is a colorless, transparent and clear liquid with a concentration of 31.8% -33.2%, which is used to reduce nitrogen oxides. The urea solution for vehicles was first used in Europe, called Adblue, and the North American term was DEF (Diesel Exhaust Fluid), which is called the vehicle urea solution or "vehicle denitrifier" in China.

The currently used vehicle urea solution is generally composed of 32.5% high-purity urea and 67.5% deionized water. The concentration of urea directly affects the reduction rate of nitrogen oxides and the crystallization point of the urea solution. Too high or too low concentration will not only improve the conversion efficiency of nitrogen oxides, but will also cause secondary pollution caused by the remaining ammonia. The concentration of 32.5% was chosen because the urea solution of automotive has the lowest crystallization point at this concentration (freezing point -11 ° C).

So why use a urea solution for cars?

With the continuous improvement of China ’s diesel engine emission standards, modern diesel vehicles, whether they adopt EGR [exhaust gas recirculation technology] or SCR [catalytic reduction] and other technologies in the treatment of exhaust gas, have become the automobile after-treatment equipment or application technology. Necessary for the development of the times. China's upgrade of the fourth line is the SCR line, that is, the use of selective catalytic reduction technology. The operation process is shown in the figure. Generally, the exhaust gas comes out of the turbine and enters the exhaust pipe. A urea metering injection device is installed on the exhaust pipe to inject urea aqueous solution. The nitrogen oxides in the urea solution and the exhaust gas are in the SCR reaction tank. A redox reaction occurs, and nitrogen and water are generated and discharged.

Nitrogen and oxygen compounds in automobile exhaust are not only one of the causes of acid rain, but also directly harm the human body. The role of the urea solution is to chemically react with nitrogen oxides in the car exhaust to generate non-toxic nitrogen and water, thereby reducing the emissions of toxic gases in the car exhaust and reducing pollution.

During the transportation of urea, it needs to be protected from light and high temperature.

The optimal transport and storage temperature should be kept between -5 ° C and 25 ° C. In addition, urea for vehicles will crystallize when the temperature becomes low, and the volume expansion will increase to 7%. If the urea is too full, it will be kept below 90% of the storage volume ratio. High temperature will cause the decomposition of urea. Generally, the storage temperature of urea is related to the storage time of urea.

Therefore, the technology of combustion optimization + SCR also has certain shortcomings. It requires the construction of urea supply infrastructure, the need to prevent ammonia gas excretion technology, the requirement to reduce the consumption of lubricating oil by the engine, and the requirements for the system layout space (requires the addition of a urea tank). ).

Then let's focus on another technology line


Nie Haihua

EGR (exhaust gas recirculation) is to pass a small part of the exhaust gas in the exhaust gas into the intake system through the EGR valve, and after mixing with the mixture, enter the cylinder to participate in the combustion. A small amount of exhaust gas enters the cylinder to participate in the combustion of the mixed gas, which reduces the temperature in the cylinder during combustion. Since NOX is generated under high temperature and oxygen-rich conditions, the generation of NOX is suppressed, thereby reducing the content of NOX in the exhaust gas.

The advantages of EGR + DPF over combustion optimization + SCR are that no urea supply system is needed and the system size is small. Disadvantages are the high combustion explosion pressure caused by the EGR system, which is sensitive to the sulfur content in the fuel (not more than 50ppm), and the carbon content of the fuel with delayed injection. In most cases, the existing structure of the National III engine needs to be changed, and the clean regeneration of DPF is complicated And often the effect cannot be guaranteed. EGR + DPF technology is basically used in the United States, because the fuel price in the United States is lower than in Europe, and car owners are not sensitive to fuel economy, but they need to consider the cost of urea. In addition, the US2007 standard requires no maintenance for 150,000 kilometers for new cars. The SCR technology obviously does not meet this requirement, because urea is added once every 5,000 kilometers. Therefore, to adopt SCR technology, you need to apply for a special license from the US EPA. In Europe, long-distance trucks usually use SCR technology, while short-distance transportation or urban buses choose EGR + DPF technology.

Back to the original form, compared to JMC Teshun

采用欧洲领先的电控EGR阀(废气再循环)技术,通过电控系统将部分发动机燃烧废气快速冷却后引入进气管,与新鲜空气混合后再次进入发动机气缸进行二次燃烧,降低了发动机燃烧的最高温度和氧含量,从而减少了NOx化合物的生成量,V80国5产品的电控EGR阀,深度集成EGR模块、电控EGR阀、EGR冷却器,比传统的机械式控制更精准,在全工况范围内实现废气再循环,并根据发动机的实际工况自动调整再循环的废气量,既保证发动机的动力性还有效减少Nox。 The Chase V80 V5 engine adopts Europe ’s leading electronically controlled EGR valve (exhaust gas recirculation) technology. Through the electronic control system, part of the engine's combustion exhaust gas is quickly cooled and introduced into the intake pipe. After mixing with fresh air, it enters the engine cylinder again for secondary combustion. , Reduces the maximum temperature and oxygen content of the engine combustion, thereby reducing the amount of NOx compounds generated, V80 National 5 products of electronically controlled EGR valve, deeply integrated EGR module, electronically controlled EGR valve, EGR cooler, than the traditional mechanical type The control is more accurate, the exhaust gas recirculation is realized in the full range of operating conditions, and the amount of exhaust gas recirculated is automatically adjusted according to the actual operating conditions of the engine, which not only ensures the power of the engine but also effectively reduces Nox.

(颗粒捕集器)技术,通过电控系统的精确控制,可以将90%颗粒排放物质进入大气之前将其捕集。 The Chase V80 V5 engine also uses the electronically controlled DPF (particulate trap) technology commonly used in Europe. Through precise control of the electronic control system, 90% of particulate emissions can be captured before entering the atmosphere. The DPF trap uses advanced electronic control systems, precious metal coatings, and fuel-added catalysts (FBC) to adsorb particles in diesel engine exhaust on the precious metal coatings on the DPF.

的使用成本(一般SCR技术在燃油消耗20L时约需消耗1L尿素,尿素约4~5元/L)。 Compared with SCR technology, DPF does not need to add urea, which is simpler and lower in cost. It can save customers 1,500 yuan in use costs in one year . / L).

V80 National V adopts VGT + third-generation high-pressure common rail + electronically controlled EGR valve + DPF, which can effectively remove 90% of pollutant emissions . In recent years, air pollution has become more and more serious, which not only affects everyone, but also causes damage to the health of our family. Choosing the Chase V80 national five model can reduce air pollution and damage to the environment, and not only contribute to society, but also Ability to care for family.

Yunlang

368 Songjiang District / Rongxing Road

Qingpu District / Beiqing Highway No. 8665

1333 Fengxian District / Fengpu Avenue

Jinshan District / Tingwei Highway 2028

Yunlang Chase Sales Service Hotline: 4006-021-518

HeyCar (HeyCar_Yunlang)


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