DIESEL PARTICULATE FILTERS DPF
A diesel particulate filter sometimes referred to as a DPF removes the diesel particulate matter (or soot) from the exhaust gas of a diesel vehicle, therefore reducing particulate emissions.
Why Do Cars Have DPF's?
With changes to the car emissions legislation, the 'Euro 5' standards will make diesel particulate filters a commonplace in diesel car exhausts as catalytic converters are in petrol cars.
How Does a Diesel Particulate Work or DPF Work?
Unlike a Catalytic Converter a DPF is not a flow through device, and works by forcing the gasses to flow through the filter. As the channels of the filter are blocked at alternate ends, the gasses are forced to flow through the cell walls in order to exit the filter. As the cell walls are porous, the gasses are allowed to pass through, but the particulate matter is deposited on the cell walls. This ensures that only the clean exhaust gasses can exit, and the particulate matter is trapped in the filter.