DPF， The Diesel Particulate Filter, also known as the Diesel Particulate Filter, is a critical component in the exhaust system of diesel vehicles. It utilizes surface and internal filtering devices, such as diffusion precipitation, inertial precipitation, and linear interception techniques, to efficiently capture particulate matter. This device can significantly purify up to 90% of particles in the exhaust, making it the most effective and direct method for purifying diesel particulate matter. In short, DPF reduces the concentration of particulate matter (PM) in the exhaust through its filtering effect. Usually, DPF and DOC (diesel oxidation catalyst) together form an important component of the exhaust treatment system.

With the continuous accumulation of carbon particles in the DPF trap, when a certain stage is reached, the increase of particulate matter in the trap leads to exhaust back pressure exceeding the limit range, or the regeneration mileage has reached the preset upper limit, thereby affecting the power and economy of the engine, DPF regeneration operation is required. So, what is DPF regeneration?

The regeneration process of DPF is to timely remove the deposited carbon particles through catalytic oxidation according to different triggering conditions, thereby restoring the filter to its initial working state. This periodic working process is an inevitable requirement for vehicles to operate normally at a certain stage, and it is also the core feature of DPF technology.

There are two main types of regeneration methods: active regeneration and passive regeneration. The Xichai 4DW National V DPF adopts a regeneration strategy that combines active and passive methods. In terms of active regeneration, by precisely controlling the intake and engine cylinder fuel injection, and with the assistance of DOC, the temperature inside the particle trap is increased, thereby promoting the combustion reaction between carbon particles and oxygen. This method has the characteristics of high efficiency and speed. According to the regeneration triggering conditions, it can be further divided into two modes: in operation regeneration and in-situ service regeneration.

Passive regeneration, as a regeneration method that does not require external intervention, mainly relies on the low-temperature combustion reaction between carbon particles and NOx on the surface of the filter carrier to achieve. Compared to active regeneration, it requires a lower temperature to continuously regenerate the DPF. However, the efficiency of passive regeneration is relatively low. After the vehicle has been running for a certain period of time, the engine control system will initiate active regeneration to ensure the continuous and efficient operation of the DPF.