Are you facing a large bill for your DPF replacement?.The progress of the cycle is monitored by the temperature sensors and takes constant feedback from the differential pressure sensor which enables to know when the burn off process is complete. Once the ECU establishes the saturation level it is able to force a regeneration cycle. It is the variance in pressure between these two pick-ups which allows the ECU to calculate the percentage saturation of the DPF. There is differential pressure sensor mounted in the engine bay which picks up the pressure both before and after the DPF. The most common type of DPF runs two pressure sensors and a varying number of temperature sensors. The operation of the DPF is controlled by the ECU and requires multiple signal feeds from various sensors in order to operate effectively. A vehicle used on the motorway is also going to be able to regenerate more often and effectively as it is in the perfect driving environment for the regeneration process to occur. Once the DPF reaches a certain level of ‘Saturation’ it performs a regeneration cycle to burn off the particulate matter inside the filter.Ī car which is primarily used for motorway use will generally run at warmer temperatures and therefore produce far less particulate matter than one used in a stop/start city environment. By forcing the exhaust gases through the walls between the channels of the DPF, the particulate matter is deposited on the walls, so reducing the amount of air pollution. Inside is a complex honeycomb ceramic structure designed to filter the exhaust gases while minimising flow reduction (which would otherwise limit performance). The DPF looks similar to a traditional exhaust silencer, but is mounted close to the engine.
Standards aim to deliver an 80% reduction in diesel particulate (soot) emissions but as owners are finding out with great expense, the technology is not without its problems. In fact, many cars registered before 2009 will have had one fitted too in anticipation of the change in standards. The exhaust emissions standards for new cars have effectively required fitment of a DPF in the exhaust of diesel cars since 2009 when the 'Euro 5' standard came into force. BACKGROUND TO DIESEL PARTICULATE FILTERS (DPF)
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