Starting from December 1, 2020, non road mobile machinery must comply with the National IV emission standards. So, how can old devices meet this new standard? Installing DPF may be a solution. So, what exactly is DPF ?

DPF， The full name is Diesel Particulate Filter, which has two working modes: active regeneration and passive regeneration. Passive regeneration relies on specific temperature and pressure conditions to naturally process particulate matter in the filter. Active regeneration, on the other hand, deals with particulate matter by actively creating conditions through the system when the vehicle cannot naturally meet specific conditions. In locomotive exhaust systems, silicon carbide plays a crucial role in blocking particulate matter emissions. According to data, adopting this measure can effectively reduce up to 80% of pollutant emissions.

The working principle of DPF is to filter and reduce particulate matter (PM) in the exhaust system of diesel vehicles. It adopts various filtering mechanisms, such as diffusion settling, inertial settling, and linear interception, to effectively capture and reduce 70% to 90% of particulate matter in exhaust gas. This method is an efficient and direct means of purifying diesel particulate matter, and has been widely used internationally.

The working process of DPF consists of three stages: initial as an empty particulate filter, followed by a full particulate filter, and finally becoming a reduced particulate filter through cleaning and reduction processes. When the filter is empty, the exhaust flow resistance is low, which has a relatively small impact on engine performance. However, as carbon soot particles accumulate, exhaust resistance increases, which in turn affects engine fuel consumption and power. When the internal pressure of DPF reaches a certain value, the engine control unit will initiate the regeneration process to remove the accumulated carbon soot particles through high-temperature combustion.