Diesel Particulate Filtration system (DPF) – Decreasing Diesel powered Soot Emissions By simply eighty Percent
Adjustments to new auto emissions laws scheduled for 2009 the ‘Euro 5’ specifications, will make particulate filters as commonplace in diesel vehicle exhausts as catalytic converters are on petrol cars.
The aim is an eighty% reduction in diesel particulate (soot) emissions, but the technology’s not without difficulties roadside assistance patrols are already getting referred to as to cars with the particulate filter warning light illuminated, which generally suggests a partial blockage of the DPF filter.
Clearly, alterations to driving styles could be needed for greatest benefit from these emission-reducing programs.
How do the filters perform?
Diesel Particulate filters (DPF) or ‘traps’ do just that, they capture bits of soot in the exhaust.
As with any filter (think of the bag in your vacuum cleaner) they have to be emptied frequently to maintain performance. For a DPF this process is called ‘regeneration’ the accumulated soot is burnt off at substantial temperature to go away only a little ash residue. Regeneration could be possibly passive or energetic.
Passive regeneration – Passive regeneration takes place immediately on motorway-kind operates when the exhaust temperature is high. A lot of vehicles never get this kind of use even though so manufacturers have to layout-in ‘active’ regeneration exactly where the motor management pc (Eu) requires manage of the approach.
Lively regeneration – When the soot loading in the filter reaches a set restrict (about forty five%) the Eu can make small adjustments to the gas injection timing to boost the exhaust temperature and initiate regeneration. If the journey’s a little bit cease/commence the regeneration might not full and the warning light will illuminate to demonstrate that the DPF is partly blocked.
It ought to be feasible to start off a full regeneration and clear the warning gentle merely by driving for ten minutes or so at speeds greater than 40mph.
If you disregard the light and hold driving in a comparatively sluggish, stop/begin pattern soot loading will keep on to develop up till close to seventy five% when you can count on to see other dashboard warning lights illuminate way too. At this point driving at velocity by yourself will not be ample and the car will have to go to a vendor for regeneration.
If warnings are even now disregarded and soot loading carries on to boost then the most very likely result will be a new DPF costing about £1000.
Largely city based driving
If your possess car use or lease vehicle use is mainly city-based mostly, quit/begin driving it would be wise to select petrol instead than threat the hassle of incomplete DPF regeneration.
The most typical variety of DPF attributes an integrated oxidising catalytic converter and is located extremely shut to the motor exactly where exhaust gases will even now be comparatively very hot so that passive regeneration is feasible.
There is certainly maxxforce 7 delete to the engine although so some manufacturers use a different variety of DPF which depends on a fuel additive to lower the ignition temperature of the soot particles so that the DPF can be positioned even more from the engine.
The additive is stored in a separate tank and is routinely mixed with the fuel each time you fill up. Small quantities are essential even though so a litre of additive need to deal with about 2,800 litres of gasoline, adequate to protect twenty five,000 miles at 40mpg.
With this kind of DPF regeneration will be initiated by the Eu every single 300 miles or so based on vehicle use and will consider five to ten minutes to comprehensive. You should not discover something other than possibly a puff of white smoke from the exhaust when the procedure is concluded.
The AA has observed proof of DPF methods failing to regenerate – even on autos – that are used primarily on motorways. Their summary is that on cars with a very large sixth gear motor revs are too lower to make adequate exhaust temperature, but occasional more challenging driving in reduce gears ought to be adequate to bum off the soot in this kind of instances.
Check out the handbook
If you buy or lease a car with a DPF equipped it truly is crucial to go through the pertinent section of the motor vehicle handbook so that you recognize exactly what actions to take if the warning gentle illuminates and how, if at all, your driving fashion may need to have to be altered to make sure maximum DPF efficiency and daily life.