GasolineTeilfiltersysteme

GasolineTeilfiltersysteme, in English often called gasoline particulate filter (GPF) systems, are exhaust aftertreatment devices used on gasoline engines to reduce particulate matter emitted by gasoline direct injection (GDI) engines. They are designed to capture soot particles that form during combustion and exit with the exhaust gas, helping to meet stringent PM limits.

Construction and arrangement typically include a ceramic or metallic substrate forming a monolithic filter. The filter element is often coated with a catalytic washcoat to promote soot oxidation and to ease regeneration. In many designs the GPF is placed downstream of other aftertreatment components, such as a gasoline oxidation catalyst or a three-way catalyst, and is integrated with sensors to monitor pressure drop and filter loading.

Operation relies on filtration of particulates with periodic regeneration to burn off collected soot. Passive regeneration occurs when exhaust temperatures are sufficient to oxidize soot; active regeneration may be required during low-temperature or light-load operation and can involve controlled enrichment or additional heating to raise the temperature of the trapped soot. Over time, inorganic ash from lubricating oil and additives accumulates in the filter because ash is not burned during regeneration; this ash buildup reduces filtration efficiency and may necessitate periodic cleaning or replacement of the filter element.

Applications and regulatory context have driven widespread adoption of GPF systems on modern gasoline direct injection vehicles to meet PM standards in regions such as Europe, North America, and parts of Asia. They can slightly increase exhaust backpressure, with potential minor impacts on fuel economy and performance, particularly during regeneration events. Materials most commonly used for the filter core include cordierite and silicon carbide.