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Diesel Particulate Filters DPF


Diesel Particulate Filter

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.

DPF Passive Regeneration

Passive regeneration takes place automatically on motorway-type runs when the exhaust temperature is high. Many cars don't get this sort of use though so manufacturers have to design-in 'active' regeneration where the engine management computer (ECU) takes control of the process.

Active Regeneration

Active Regeneration occurs when the level of soot in the filter reaches around 45%. The ECU makes small adjustments to the fuel injection timing and increases the exhaust gas temperature. This increases the exhaust temperature which then initiates the regeneration process, burning away the soot trapped in the DPF.

What cars do you have DPF's for?

We currently stock DPF's for the above vehicles, however our parts catalogue is always growing so make sure you contact us if you need a diesel particulate filter.