· Mass discharge door forced technology upgrade: diesel car will switch to SCR

“Volkswagen's emission door will definitely have a certain impact on diesel vehicles in the short term, but this problem will be fully solved after Euro 6”. On September 25th, Deputy Chief Engineer of SAIC Commercial Vehicle Technology Center for the Volkswagen “Drainage Door” incident. Wu Xuling, director of the Powertrain Division, told the 21st Century Business Herald.
Wu Xuling told reporters that in the field of diesel vehicles, there are two technical routes: DOC DPF LNT (hereinafter referred to as: LNT, lean NOx supplement) and DOC DPF SCR (hereinafter referred to as SCR, selective catalytic reduction). When European companies adopt the LNT technology route on passenger cars, the cost is lower. However, if the LNT technology route is to meet the Euro 6c standard (plus RDE) that is closer to the actual use requirements, the difficulty and cost are more technical than the SCR. Higher, so the Chinese car companies that meet the Euro 6c standard directly in the initial stage, mostly adopt the technical standards of SCR.
After the “emission door” fermentation, the diesel vehicle field is likely to be unified on the technical route, that is, collectively adopting the SCR technology route. Although the cost is higher than that of the LNT, due to the uniform technical route and similar cost, the diesel vehicle product is also made. The competition on the competition is more fair.
Public fraud is designed to increase product selling points. Why should the public emit fraud? Wu Xuling explained to the reporter that the United States has implemented the actual driving emission test, referred to as RDE (realdrivingemissions), and the EU is developing a new cycle test (WLTP) and actual driving condition emission test (RDE) for daily actual driving conditions. That is to say, there is a gap between the current EU test results and the fuel consumption and emissions in daily actual driving. The data can reach the standard under certain operating conditions of the engine, and the United States has required actual driving simulation tests covering the full working condition of the engine.
This means that if American standards are to be met, Volkswagen must upgrade existing LNT-enabled products. This will increase product cost and use cost, directly weakening the competitiveness of Volkswagen diesel models in the United States.
How much does the public have to increase in order to comply with US standards? Wu Xiling calculated an account: the LNT post-processing technology adopted by Volkswagen. Compared with the technical route of SCR, taking a Passat as an example, it does not count the development fee of the previous period. It is only one or two thousand euros from the cost of the product itself. That is to say, if the masses enter the US into the technical route of SCR, the cost will increase. In addition, the cost of use of consumers will increase. The increase cost of SCR (urea) replacement frequency alone is about 10%. .
"The starting point of public fraud is to enhance product competitiveness." Zhong Shi, a senior analyst at the automobile, also believes that, in fact, compared with GM and Toyota, Volkswagen's main strong market is not successful in the US market in Europe and China. Diesel vehicles, as the highlight of the Volkswagen to enter the United States, must have product advantages.
Volkswagen adopts LNT technology, which is a lower cost route in the diesel technology route, and is the technology commonly used in most diesel passenger cars in Europe. However, the technology needs to cover real-time driving conditions, its development and materials. And the cost of use will rise.
In order to save development and manufacturing costs, to meet the low-cost requirements of users, and to circumvent US government testing, Volkswagen has adopted two sets of calibrations on the same vehicle: one for daily practical driving and one for gantry for the US government. Inspection, the vehicle can automatically detect whether it is a government bench inspection through the sensor.
Bosch said that the public fraud has nothing to do with it. Since the parts supplier of the Volkswagen diesel vehicle after-treatment system is Bosch, the Volkswagen “discharge gate” has also caused Bosch to fall into the paradox of public opinion. Since Bosch has been promoting the passenger car of diesel vehicles in recent years, it has also caused the industry to worry about the future of diesel passenger cars.
“Bosch does not have the ability to help auto companies to falsify.” Jiang Jian, vice president of Bosch (China) Investment Co., Ltd., said that unlike domestic auto brands, almost all international automakers, including Volkswagen and GM, will be the last. The system integration and calibration of the vehicle engine management system is its core competitiveness, so it is impossible for component companies to participate. "We are equivalent to selling computers to customers, customers have to use computers to commit crimes, and we can't control them."
However, Bosch has been pushing the use of diesel vehicles in recent years. Jiang Jian said frankly that after the occurrence of the Volkswagen “discharge gate”, it will definitely have an impact on the development of diesel vehicles.
The proportion of diesel cars in the Western European market is as high as 50%. Compared with gasoline vehicles, the fuel economy is obvious. However, in the domestic market, due to policy restrictions, diesel vehicles are still mainly used in commercial vehicles.
In the middle of this year, the Ministry of Industry and Information Technology released the "China Made 2025" detailed version of the diesel engine high-pressure common rail technology into the scope of encouragement, the industry began to explore, the ice-sealed diesel passenger car market can break the ice.
Compared with gasoline vehicles, diesel engines have the advantages of low fuel consumption, low carbon dioxide emissions, high torque and high acceleration performance. Its fuel-saving advantage is also very obvious in passenger cars. Mao Xiaoyuan, sales director of Bosch Automotive Diesel Systems Co., Ltd. told reporters: "The same 1.6LTDI golf, using gasoline fuel consumption of 4.9L, while diesel only 3.2L, fuel economy up to 35 %."
However, the development of diesel vehicles in the Chinese passenger car market is very slow. Among the newly registered passenger car users, the proportion of diesel vehicles is only 0.6%. The lack of policy support and consumer doubts, coupled with the quality of oil supply, made the company that had previously “eat crabs” in the diesel passenger vehicle market in China ultimately failed.
"This year and next year, the development of diesel cars is very crucial. After the 'fake door' incident, it will definitely have a negative impact." Insiders analyzed that the first thing is whether the matter is a mass orphan or industry-wide behavior, and will investigate; Second, whether the fuel-saving and environmental protection of diesel vehicles can withstand the test, it will take some time to be recognized again.
Domestic diesel vehicles will generally adopt SCR
"In fact, Volkswagen is not without technology, the key is to improve the competitiveness of the model in the North American market." Wu Xuling said. Prior to Euro 5, European diesel passenger cars mostly used LNT post-processing technology. After the mass discharge door, the LNT technology route is likely to be no longer used. However, Wu Xuling said that the mass emission door has little impact on Chinese car companies.
At present, diesel vehicles of Chinese automakers are mainly concentrated in commercial vehicles. Since the LNT technology route itself is not suitable for large-scale vehicles, domestic diesel commercial vehicles have almost adopted the technical route of SCR.
In the passenger vehicle market, the development of diesel passenger cars in China is relatively slow. Although some models are already listed one after another, compared with foreign countries, they are still in the starting stage, that is, the transition period from demonstration operation to mass production. These diesel passenger cars will be officially put on the market and will take several years.
The background of China's diesel passenger vehicles is listed on the market: the emission regulations of the world are becoming more and more strict. Especially after the implementation of Euro VI, the detection of diesel vehicles must reach the current US standard, that is, the actual driving emission test. RDE.
Under the circumstance of regulations, diesel passenger car companies, if they still want to rely on LNT's technical route, then will not meet the requirements of the European six, which will lead to domestic independent brand enterprises, in the early days of diesel passenger car development, I chose the technical route of SCR. "For the Chinese car companies, it is more fair to participate in the competition." Wu Xuling said.

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