The DPF policy refers to the relevant regulations and measures for installing particulate filters (DPF) on diesel vehicles. DPF， The Diesel Particulate Filter is a key component in the after treatment system of diesel vehicles, mainly responsible for capturing and adsorbing carbonized particulate matter in the exhaust, effectively purifying up to 70% to 90% of particulate matter in diesel vehicle exhaust.

Installation requirements: In recent years, multiple regions have put forward clear requirements for diesel vehicles to install DPF. For example, in the Shenzhen area, it is stipulated that all newly sold National V diesel vehicles must be equipped with DPF . In addition, the implementation of China VI emission standards has made DPF a standard configuration for diesel vehicles, covering many effective control strategies.

Regeneration strategy: The regeneration strategy of DPF includes two methods: passive regeneration and active regeneration. Active regeneration increases exhaust gas temperature by injecting fuel into the exhaust pipe, ensuring that particulate matter burns at high temperatures.

Durability and maintenance: The durability of DPF is an important issue. Frequent regeneration operations accelerate the aging and failure of DPF, and are highly sensitive to the sulfur content of diesel and the ash content of engine oil. Therefore, using low-quality diesel and engine oil can cause the DPF to quickly lose its regeneration function or even be damaged.

The impact of DPF policy on diesel vehicle emissions

DPF can effectively reduce particulate matter emissions from diesel vehicles, but its capacity is limited, and once it reaches the adsorption limit, regeneration operation is required. Frequent regeneration operations are not only time-consuming and labor-intensive, but also accelerate the aging and failure of DPF. In addition, DPF is sensitive to the sulfur content of diesel and the ash content of engine oil, and using poor quality fuel and engine oil can cause DPF failure. ‌