DPF refers to a particulate matter trap specifically designed for diesel vehicles, which can efficiently filter out fine particles in organic exhaust gases. But when the vehicle is used for a period of time, fine particulate matter will block the particulate trap, and it must be cleaned. This cleaning process is called DPF regeneration.

Diesel particulate filters are divided into active regeneration and passive regeneration based on their working principles.

Passive regeneration refers to the process where the particulate matter collected by the filter is processed once specific temperature and pressure conditions are reached.

Active regeneration refers to the need for the system to actively create conditions to process particulate matter when the vehicle fails to meet specific reaction conditions. In the emission system of locomotives, the use of diamond sand is used to block the emission of particulate matter. Data shows that this measure can reduce pollutant emissions by up to 80%.

DPF captures particles through surface and internal mixed filtration devices, such as diffusion precipitation, inertial precipitation, or linear interception, which can effectively purify 70% to 90% of particles in exhaust. It is one of the most effective and direct methods for purifying diesel particulate matter and has been commercialized internationally.

To meet the Euro VI or US 2010 emission regulations, the exhaust after treatment system of diesel engines will become more complex, requiring the integration of diesel oxidation catalysts (DOC), diesel particulate filters (DPF), selective catalytic reduction devices (SCR), etc. to control diesel engine emissions.

With the continuous generation of soot particles, the amount of soot particles captured inside the DPF gradually increases, leading to an increase in exhaust gas resistance. The fuel consumption and power of the engine are affected by the increase in exhaust back pressure.

The engine control unit monitors the pressure inside the DPF through an exhaust gas pressure sensor. When the engine control unit detects that the pressure inside the DPF reaches a certain value, it is difficult to discharge the exhaust gas, greatly limiting the power and fuel economy of the engine.

At this time, the engine control unit controls the self-cleaning and reduction of soot particles, and burns the soot particles accumulated inside the DPF at high temperature to achieve DPF regeneration.

DPF has already been widely used in National VI diesel vehicles at present. The combination of DPF and urea solution injection system software can significantly reduce the environmental pollution of diesel vehicles' exhaust pipes, making DPF a standard equipment for National VI diesel vehicles.

The process of DPF regeneration generally takes 10-15 minutes. During this process, the vehicle's engine will increase the RPM to raise the exhaust pipe temperature, and the high temperature will immediately ignite the particulate matter. If the car buyer stops the engine during the regeneration process, the exhaust pipe temperature of the vehicle cannot increase, and particulate matter cannot be eliminated.