The reporter learned from relevant persons in the environmental protection department that the state-standard for heavy-duty diesel vehicles will be implemented on July 1st as scheduled. However, due to the fact that the domestic oil supply cannot meet the requirements, it is the fourth standard for light-duty diesel vehicles that account for nearly half of the diesel vehicle fleet. The national implementation date will be postponed again, and the specific implementation time is uncertain. At this point, the dilemma of atmospheric pollutant emissions caused by the “vehicle oil misalignment” cannot be solved.

The above-mentioned sources explained that the technology adopted by the National IV light-duty diesel vehicle is only applicable to diesel with a sulfur content of 50ppm (National Standard), and 350ppm (National Standard) diesel is not available until July 1st this year. When the national supply of standard diesel is even more distant in the future, the current oil cannot meet the requirements of diesel engines and tail gas aftertreatment devices under the new standard.

When will the national standard diesel be provided for long-term national supply?

This is the second time that the national standard for light diesel vehicles has been postponed. The National Standard for Light-duty Diesel Vehicles, promulgated in 2005, stipulates that the type approval of the fourth stage shall be implemented from July 1, 2010. From the year after that date, that is, from July 1, 2011, all manufactured and sold lightweight Vehicle emissions must meet the requirements of this standard.

However, at the end of 2010, the General Office of the Ministry of Environmental Protection stated in its reply to the China Association of Automobile Manufacturers that the implementation of the National IV Standard was postponed. According to the Ministry of Environmental Protection, “Since the National IV vehicle fuel standard has not yet been introduced, it is still unable to ensure that the corresponding vehicle fuel is supplied nationwide, which will bring about certain difficulties for the full implementation of the national standard for motor vehicles.” Therefore, “For light diesel vehicles, It is tentatively postponed to implement the National IV standard for two years, that is, starting from July 1, 2013, all light diesel vehicles that do not meet the requirements of the National IV standard shall not be sold and registered.”

“In the case of hazy city pollution, the national standard for light diesel vehicles has also been postponed twice across the country. This is incredible,” said Yuexin, director of the Vehicle Fuel Emissions Laboratory at the Chinese Research Academy of Environmental Sciences, with vehicle pollution. It has become an important source of air pollution in China. Among them, the emissions of nitrogen oxides and fine particulates (including PM 2.5) from light-duty diesel vehicles are greater than those from gasoline vehicles (such as cars).

Compared with the implementation of delayed emission standards for light diesel vehicles, the four emission standards for heavy-duty diesel vehicles will be implemented as scheduled, but they have also been postponed twice. In this regard, the industry believes that there are three reasons: the lower fuel quality restricts the use of vehicles and the effects of emissions; China's commercial vehicles and heavy-duty diesel engine manufacturers have their own brands, and their technology reserves are insufficient; commercial vehicles and heavy-duty diesel engines that meet higher emission standards tend to increase. The cost of one to tens of thousands of yuan is not acceptable to users. Among them, the oil problem is considered to be the main reason.

Jia Xinguang, executive director of the China Automobile Dealers Association, said that the national standard should not be postponed. The key is to solve the oil problem.

The implementation of the fourth national emission standard for heavy-duty diesel vehicles may impact commercial vehicles, especially heavy trucks. Dong Yang, executive vice president and secretary-general of the China Association of Automobile Manufacturers, said that if the standards are implemented as scheduled, they will face the problem of inadequate supply of denitrification agent for the four diesel oils in the producing country and regulatory issues for the universal use of the National IV diesel.

“We are also trying to figure out how to implement the policy. Once the national standard is implemented, SCR (selective catalytic reduction) will be added behind the vehicles using common-rail technology. Now common rail technology and SCR are mostly held by foreign manufacturers. Common rail and SCR, there is no way to meet the requirements of domestic car prices. In addition, the installation of SCR need to go to the gas station plus urea, China's current highway gas stations are not set up urea supply point." A domestic heavy truck company technical person in charge said.

In addition to relying on foreign technology and products, urea supply supporting shortages, the increase in costs has also become an important factor restricting the sales of the four diesel vehicles. According to the above-mentioned person in charge, under normal circumstances, the installation of SCR for vehicles will require about 15,000 vehicles, which will increase the cost of low-end vehicles under 100,000 to a large extent, making it difficult for some car buyers to accept.

"The market was slightly better in the first half of this year, and many of them were buying the country's three cars," said the person in charge.

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