As the name suggests, the Diesel Particulate Diffuser (DPD) minimises the amount of PM a truck emits via the exhaust. The DPD, which is located midway along the truck's exhaust, combines an oxidation catalyst to clean nitrogen oxides and hydrocarbons, and a ceramic filter that traps harmful PM.
Pressure differential sensors within the ceramic filter are used to monitor the accumulation of trapped PM. Once a certain amount of PM is detected, the ceramic filter regenerates; this is done via post-injection which elevates the exhaust gas temperature to burn off the accumulated PM.
The cleaning process is aided by precision control of the exhaust brake and exhaust throttle, which assists in raising the exhaust gas temperature, promoting PM burning.
The truck's engine control unit (ECU) continually monitors the condition of the ceramic filter and under the great majority of operating conditions, regenerates the filter automatically without the driver even knowing. However, in some rare circumstances, the filter will require manual regeneration.
Manual regeneration requires the driver to press the regeneration button on the dashboard and keep the truck stationary and idling throughout the 15-20 minute process.
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How Diesel Particle Defuser work (DPD or DPF)
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