According to the State Council's request, China's total emissions of nitrogen oxides (NOx) from motor vehicles at the end of the "Twelfth Five-Year Plan" are 10% lower than at the end of the "Eleventh Five-Year Plan." However, so far, the total amount of NOx emissions from dedicated vehicles has not decreased.
"Commercial vehicles have the greatest contribution in the exhaust emissions of motor vehicles." Li Guoxiang told the Herald reporter that commercial vehicles mainly use diesel engines. They have long operating mileage and high fuel consumption. The pollutants emitted from the tail gas are mainly particulate matter (PM) and NOx is the main "culprit" of motor vehicle exhaust pollution, and it is also the monitoring focus of emission reduction. According to the data of the Ministry of Environmental Protection, China’s diesel vehicles accounted for only 6.3% of the total vehicle population in 2011, while NOx emissions accounted for 67.2% of the country’s annual NOx emissions, and PM emissions also accounted for total vehicle emissions. 78.8%.
In fact, in order to reduce tail gas pollution from commercial vehicles, the Ministry of Environmental Protection has planned to implement IV emission standards for commercial vehicles nationwide on July 1, 2011 and January 1, 2012. However, due to problems in the company's technical reserves and oil quality, it has repeatedly been postponed. .
It is understood that the implementation of special-purpose vehicle IV standard diesel engine compared with the national standard III engine not only can reduce fuel consumption by 5%-7%, but also can reduce 80% of PM emissions. From January 1, 2007, Beijing has taken the lead in implementing the National IV emission standards for automobiles. Afterwards, Shanghai and Guangzhou followed suit one after another.
Buy expensive with cheap
As a leader in the internal combustion engine industry, Weichai started to build a National IV engine platform after the successful development of the Blue Engine III engine in 2006.
"From State III to State IV, it is not only a simple emission upgrade, but an upgrade of the entire engine platform." Guo Shenggang explained that this includes the strengthening of the engine itself - to withstand higher explosive power, optimization of combustion, through purification Reducing more than 80% of PM emissions also includes increasing after-treatment systems to reduce NOx by more than 35%.
He said that Weichai has successfully developed its own post-processing system. Utilizing the urea supply system, urea is mixed with the exhaust gas of the engine and produces a series of chemical reactions that decompose the harmful substances generated by the combustion of diesel into nitrogen, water and cleanliness. The air thus raises engine emission standards.
At the same time, relying on the self-developed post-processing electronic control system, Weichai achieved the match between the entire post-processing system and the vehicle. At present, the Weichai post-processing system has been assembled in small quantities in the truck and passenger car markets, and customer feedback is good.
"Each additional set of post-processing systems for new cars will cost more than 10,000 yuan. However, due to the more fully-burning Chinese IV engines, which is fuel-efficient, this difference will earn more than a year." Guo Shenggang said that the national IV engine power Better sex, better economy, comprehensive savings of more than 5%. From the perspective of fuel economy alone, energy consumption is reduced, which is to reduce emissions. Of course, fuel-efficient for users, more importantly, is to reduce the cost of use. After earning the difference, the later use is the profit earned by the province. Therefore, although the diesel price of the National IV emission standard is high, the use cost is reduced and the user is ultimately the beneficiary.
"Actually, the technical reserves of special-purpose auto companies are generally very good, but the market pushes ahead with the oil product." Li Guoxiang believes that the slow pace of oil upgrading has hindered the upgrading of automobile emissions, and the upgrading of oil products The biggest obstacle is the cost, how to solve the increase in the cost of oil upgrades, and the need for coordination and balance between the interests of the government, oil companies and car users.
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