Remap180
18-12-2009, 13:48
DPF Diesel Particulate Filters
DPF diesel particulate filters are also called particulate filters and FAP (usually by French car makers) the following information will help understand the function, and potential issues associated with DPF filters.
The latest diesel engines have a diesel particulate filter (DPF) and a reactivating unit. The DPF collects particulates such as black smoke, soot, HC, etc, which are found in the exhaust gas. The recovery unit is further upstream than the DPF in order to maintain the function of the DPF.
The recovery unit has an oxidation catalyst. The NO and O2 in exhaust gas react with each other, and NO2 is generated. The generated NO2 reacts with the particulates. As a result, the particulates collected in the filter are eliminated, and the DPF is recovered.
The particulates react with O2 at a temperature of approx 550° C. or more, and react with NO2 at a temperature of approx 250° C. or more.
When a vehicle is driven at a low continuous revs on a regular basis, the temperature of exhaust gas is maintained at approx 250° C.
Even given this type of use, provided that NO2 is supplied by the recovering unit, the DPF can achieve continuous recovering state in which particulates are burnt while collecting the particulates.
However, if light load operation continues, the temperature of the exhaust gas falls. As a result, it is difficult to maintain the temperature of the oxidation catalyst further up system than the DPF, so there are situations in which recovery of the DPF is insufficient.
If the continuous recovering function deteriorates, the DPF is in an over-collected state, and clogging by particulates occurs. As a direct result, an exhaust gas pressure increases, and the fuel efficiency and the power performance of the engine will deteriorate.
Summary
If you drive a modern diesel vehicle that incorporates a DPF (diesel particulate filter) you need to be aware that short journeys on a regular basis, may result in DPF associated problems.
For more information on DPF and other aspects of ecu remapping and tuning please visit http://www.rapidremap.co.uk/#/diesel-particulate-filter/4535184778
DPF diesel particulate filters are also called particulate filters and FAP (usually by French car makers) the following information will help understand the function, and potential issues associated with DPF filters.
The latest diesel engines have a diesel particulate filter (DPF) and a reactivating unit. The DPF collects particulates such as black smoke, soot, HC, etc, which are found in the exhaust gas. The recovery unit is further upstream than the DPF in order to maintain the function of the DPF.
The recovery unit has an oxidation catalyst. The NO and O2 in exhaust gas react with each other, and NO2 is generated. The generated NO2 reacts with the particulates. As a result, the particulates collected in the filter are eliminated, and the DPF is recovered.
The particulates react with O2 at a temperature of approx 550° C. or more, and react with NO2 at a temperature of approx 250° C. or more.
When a vehicle is driven at a low continuous revs on a regular basis, the temperature of exhaust gas is maintained at approx 250° C.
Even given this type of use, provided that NO2 is supplied by the recovering unit, the DPF can achieve continuous recovering state in which particulates are burnt while collecting the particulates.
However, if light load operation continues, the temperature of the exhaust gas falls. As a result, it is difficult to maintain the temperature of the oxidation catalyst further up system than the DPF, so there are situations in which recovery of the DPF is insufficient.
If the continuous recovering function deteriorates, the DPF is in an over-collected state, and clogging by particulates occurs. As a direct result, an exhaust gas pressure increases, and the fuel efficiency and the power performance of the engine will deteriorate.
Summary
If you drive a modern diesel vehicle that incorporates a DPF (diesel particulate filter) you need to be aware that short journeys on a regular basis, may result in DPF associated problems.
For more information on DPF and other aspects of ecu remapping and tuning please visit http://www.rapidremap.co.uk/#/diesel-particulate-filter/4535184778