In 2004, China implemented the "Limits and Measurement Methods for Pollutant Emissions from Light duty Vehicles (II)" equivalent to the Euro I standard, which requires vehicles to be equipped with diesel particulate filters (DPF) to treat exhaust gases. With the advancement of technology, the 2007 National III standard was equivalent to the Euro III standard, with stricter requirements, while the 2010 National IV standard further reached the Euro IV standard. The continuous improvement of these standards has promoted the continuous development and application of diesel particulate filter technology.

The Euro VI standard has stricter restrictions on PM emissions compared to Euro V. There are two main upgrade plans for diesel engine exhaust after treatment equipment in Phase IV of China: one is to use selective catalytic reduction (SCR) technology to treat nitrogen oxides in exhaust gas through urea solution; The second is to efficiently treat the combustion generated particles through diesel particulate filters (DPF) or diesel oxidation catalysts (DOC) combined with EGR (exhaust gas recirculation) technology. Currently, the widely recognized effective method for reducing PM in diesel engines is DPF technology. In the process of upgrading from National IV to National V, reducing PM emissions has become a key issue.

The use of DPF is the main way to solve this problem.

Diesel particulate filter, abbreviated as DPF, is an efficient exhaust gas treatment device. Its working principle is mainly based on filtration technology, which can effectively capture and remove particulate matter from diesel engine exhaust. Through regular regeneration processes, DPF can remove accumulated particles, thereby maintaining the continuity and stability of its filtration performance.