Diesel Particulate Filter

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The DPF is designed to combat soot that is created by the diesel engine. The DPF is a honeycomb design that collects the soot and stores it to be burned off at a predetermined time. The DPF goes through a regeneration phase which burns off the soot collected within the filter. The DPF is located close to the engine to increase its efficiency by using the heat generated by the engine to help in the regeneration phase. The DDE initiates the regeneration phase depending on several factors. The regeneration phase will occur approximately every 500 miles. The DPF is also monitored by pressure sensors installed in the filter. Monitoring of the DPF begins when the exhaust gas and DPF temperature reach a predetermined value. If the differential pressure within the DPF surpasses a defined value within a predetermined amount of time a regeneration phase is initiated. During a regeneration phase the exhaust temperature is increased by post injection events. Diesel fuel is injected after combustion has taken place increasing the exhaust temperature in turn burning off the accumulated soot in the DPF. During the regeneration phase a small loss of power may be experienced for a short amount of time.

The DPF and DOC are combined on newer diesel engines, limiting the number of components within the exhaust system. On the E70 X5 the low pressure EGR is fed off of the DPF/DOC this setup is only found on this model due to the possibility of the vehicle being used for towing.

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