Through advanced filtration technology and high - quality materials, we ensure that our DPFs meet the most stringent environmental standards helping to improve air quality and protect the environment.
Through advanced filtration technology and high - quality materials, we ensure that our DPFs meet the most stringent environmental standards helping to improve air quality and protect the environment.
For friends familiar with National VI vehicles, automotive urea solution and DPF are undoubtedly two hot topics. National VI vehicles have strict requirements for the quality of urea used in vehicles, and are specially equipped with urea quality sensors. At the same time, National VI Motors has also added a DPF system specifically designed to treat diesel vehicle exhaust.
The technical roadmap of National VI vehicles mainly includes the integration of components such as EGR, DOC, DPF, and SCR to achieve strict emission control. The combination of DOC/DPF and SCR, through passive and active regeneration techniques, can more effectively control oxidation and clean the filter, thereby removing over 90% of particulate matter. After system optimization and matching with the engine, this post-treatment system can simultaneously process particulate matter and nitrogen oxides.
There are significant differences in the after treatment systems between National V and National VI vehicles
Firstly, China VI vehicles have added components such as DOC+DPF+ASC to their post-processing system hardware, and have also added thermal management and regeneration control functions to their software. Secondly, more sensors have been added to the post-processing system, making the control more precise, but also increasing the complexity of the control system. Finally, in order to meet extremely low emission limits, National VI vehicles need to adopt high-precision metering injection systems and achieve closed-loop control of SCR systems.
DPF mainly captures particulate matter in engine exhaust through diffusion, interception, gravity, and inertial collision. Its core component is mainly solid carbon, while the periphery contains polymers produced by incomplete engine combustion. The lower the combustion efficiency of the engine, the poorer the quality of fuel and lubricating oil, and the easier it is to form more polymers. These polymers may contain salt generated by lubricating oil or fuel additives, which can cause severe blockage of DPF and affect the normal operation of vehicles.
The regeneration of DPF is a difficult point in the application process, and the key lies in solving the following problems: firstly, the control of exhaust temperature, which needs to be as close as possible to the engine exhaust port; Secondly, the activity of the catalyst is influenced by the sulfur and phosphorus content in the fuel; The quality of lubricating oil determines the degree of ash accumulation, which in turn affects the maintenance cycle of DPF.
Dry soot and organic matter on DPF will be converted into ash during the regeneration process, which mainly comes from sulfates produced by lubricating oil and diesel combustion. Due to the inability to actively remove ash content, manual removal is required when it accumulates to a certain extent.
