What is the national six emissions
To put it simply, the National Sixth Emissions Standard is an upgrade to the current national five emissions. It upgrades the test cycle, test process, actual road driving emissions, pollutant limits, VOCs emission control, etc. standard. Scientifically improving the requirements for vehicle emissions and pollutants, compared with the national five, the country has carried out more optimization, which allows us to more objectively judge the emission level of vehicles, and is more conducive to national implementation and supervision.
Due to the large scale of the upgrade, in order to buffer the automobile industry, the emission limit schemes for the two phases of the national six a and the national six b were set. The relatively loose limit of the national six a phase will be fully implemented on July 1, 2020, and the national six b as the "complete body" of the national six will be fully implemented on July 1, 2023. The figure below shows the specific emission limits for countries 6a and b:
Comparison of national six ab emission limits
Shangfei Red Country Six Emissions Technology
Before understanding the emission technology of Shangfei Red Country Six, we must first understand that PM and NOx have contradictory factors in the combustion process of diesel engines. Controlling PM emissions will inevitably increase NOx emissions and control NOx. Emissions will result in an increase in PM emissions, and no diesel engine can use the aftertreatment system to meet both PM and NOx emission regulations.
In the engine aftertreatment system, in order to control NOx emissions, two technical routes are mainly used: SCR (selective catalytic reduction) and EGR (exhaust gas recirculation). SCR is a simple aftertreatment system that eliminates NOx in the exhaust by urea and maximizes engine efficiency. EGR is the recirculation of exhaust gases into the engine to reduce the peak combustion temperature and reduce nitrogen oxides, but limits engine power.
NOx emissions from the EGR system and engine fuel consumption curve (powder: NOx emission rate blue: engine fuel consumption rate)
At present, the mainstream national six technical routes are divided into two types: one is through EGR+SCR+DPF, and the other is Hi-eSCR+DPF.
The Hi-eSCR+DPF method has obvious advantages over the EGR+SCR+DPF method. This method uses the lowest cost to achieve maximum performance. It uses the Fiat Power SCR system, which is more efficient than other similar systems. The NOx in the exhaust gas can be effectively eliminated without the assistance of EGR. Without an EGR system, the engine requires no additional equipment technology to compensate for the lost power; nor does it require a larger engine size and cooling system to reduce the extra heat it provides, significantly reducing costs. With Hi-eSCR+DPF, it can increase power by 12% compared with EGR. Since there is no EGR to achieve the best combustion mode, DPF regeneration does not require additional fuel injection, and the simplified fuel injection system can reduce 3%. Fuel consumption; a simpler supercharger structure and fuel injection system, as well as a smaller cooling module, can reduce engine and post-processing costs by 11% compared to competing products, saving 75% of maintenance costs; DPF maintenance Interval mileage has also increased by 20%.
Shangfei red engine Hi-eSCR+DPF post-processing method
The engine emission technology of Shangfei Hongguoliu applied the advanced technology of Fiat Power and updated its own products to achieve the strict emission standards of the country. At the same time, the engine power and fuel consumption did not fall, which greatly improved the user's use value. Improve the power products for users. Nowadays, the implementation of the National Sixth is getting closer and closer to us. Only by fully understanding the Sixth National Party and fully understanding the National Sixth Engine can we take the lead in the implementation of the National Sixth, and provide convenience for future transportation and provide our own environment for the future environment. A force.
Reading volume: Source: the Philippine Red powertrain Author: Cold autumntitanium iron
HUNAN ZHONGNAN ANTIMONY&TUNGSTEN TRADING CO.,LTD , https://www.znat.com.cn