A Gasoline Particulate Filter (GPF) is a device used in the exhaust system of gasoline-powered vehicles to reduce particulate matter (PM) emissions. It functions similarly to a Diesel Particulate Filter (DPF) used in diesel engines, but it is designed specifically for the lower-temperature and different composition exhaust gases of gasoline engines.
Key Features of a GPF:
- Purpose: The GPF captures soot particles produced during combustion and prevents them from being released into the atmosphere.
- Structure: It consists of a porous ceramic or metallic substrate that allows exhaust gases to flow through while trapping the particulate matter in the filter.
- Regeneration: Over time, the filter can become clogged with accumulated soot. To maintain performance, the filter undergoes a regeneration process, where the soot is burned off by raising the temperature of the exhaust gases, either passively through normal driving conditions or actively via a system that raises exhaust temperature.
- Emissions Reduction: GPFs significantly reduce particulate emissions, which are particularly important for meeting stricter air quality standards and regulations such as Euro 7
The implementation of GPFs is part of a broader trend to reduce the environmental impact of gasoline engines, which have been scrutinized for their contribution to air pollution.