Ppf GPF Petrol Particulate Filter Regeneration

GPF (Gasoline Particulate Filter)

Gasoline Particulate Filter: GPF (Gasoline Particulate Filter) is a ceramic filter installed in the exhaust system of a gasoline engine. It can capture particulate emissions before they enter the atmosphere.

The filtering mechanism of GPF is basically the same as that of diesel engine DPF. Exhaust gas passes through the porous wall at a certain flow rate. This process is called "Wall-Flow". The wall-flow particle trap is composed of honeycomb ceramics with a certain pore density. By alternately blocking the honeycomb porous ceramic filter, the exhaust gas flow is forced to pass through the pore wall, and the particles are captured and filtered through the four methods of diffusion, interception, gravity and inertia respectively.

1. GPF structure and materials used:

For wall flow structure, GPF generally uses Cd (cordierite).

2. The principle of particle capture by GPF:

• The composition of particulate matter: insoluble particles and soluble particles, mainly from particles produced by incomplete combustion of fuel, fuel additives and lubricants
• Particles mainly exist in three forms: nucleated state; aggregated state; coarse particles
• Gasoline particles are mainly distributed between 70-100nm. There are three principles of trapping particles: diffusion mechanism, interception mechanism, and inertial collision mechanism. The three mechanisms cooperate with each other and are not completely independent.

To meet Euro 6 / China-VI stage light-duty vehicles PN emission requirements, WFEC developed WFG series cGPF catalysts. WFEC cGPF catalysts can achieve excellent PN filtration rate through optimized washcoat design and distribution. By improve of washcoat material and coating process, the backpressure of cGPF catalyst is largely decreased, thus the negative influence on engine fuel economy by cGPF is obvious lowered. And the active catalytic washcoat on cGPF can deeply purify gas pollutant (such as THC, CO and NO_x) and fulfill Euro 6 / China-VI aging requirements. cGPF can install in CC (Close-coupled) or UF (Under-floor) position, applying together with TWC. The vehicle emission of PN and gas pollutant is able to completely satisfy Euro 6 / China-VI regulations after employing WFEC TWC+cGPF aftertreatment system.