What does BMW GPF mean?
2 Answers
BMW GPF is a ceramic filter installed in the gasoline engine emission system. The following are the specific details about the ceramic filter: 1. Function: It can capture particulate emissions before they enter the atmosphere. 2. Working principle: The filtration mechanism of GPF is basically the same as that of diesel engine's DPF. The exhaust gas flows through the porous wall at a certain velocity, a process called "Wall-Flow." 3. Composition: The wall-flow particulate filter consists of honeycomb-shaped ceramics with a certain pore density. By alternately blocking the honeycomb-shaped porous ceramic filter body, the exhaust flow is forced to pass through the pore wall, and the particulate matter is captured and filtered through four methods: diffusion, interception, gravity, and inertia.
The BMW GPF is essentially a large filter installed in the exhaust pipe, specifically designed to trap fine carbon soot particles. It's like putting a mask on the exhaust pipe—all the black smoke particles emitted by the engine are caught by it. During highway driving, when the exhaust temperature rises, the accumulated carbon particles are burned into ash and expelled, a process called automatic regeneration. However, if you frequently drive at low speeds in the city, the dashboard will display a coffee cup warning light, reminding you to take the car on the highway. Currently, all China-6 compliant vehicles are required to have this device installed; otherwise, the PM2.5 emissions would exceed standards and fail the annual inspection. Some owners have noticed that after installing the GPF, fuel consumption increases by about 0.5L, and the exhaust sound becomes muffled. But environmental policies are what they are, and everyone has to adapt.
