Alterations to new car emissions laws scheduled for 2009 the ‘Euro 5’ standards, will make particulate filters as commonplace in diesel auto exhausts as catalytic converters are on petrol autos.
The goal is an eighty% reduction in diesel particulate (soot) emissions, but the technology’s not with out difficulties roadside support patrols are currently being referred to as to vehicles with the particulate filter warning gentle illuminated, which normally indicates a partial blockage of the DPF filter.
Clearly, alterations to driving types could be essential for highest gain from these emission-reducing systems.
How do the filters function?
delete maxxforce 13 (DPF) or ‘traps’ do just that, they catch bits of soot in the exhaust.
As with any filter (feel of the bag in your vacuum cleaner) they have to be emptied regularly to sustain efficiency. For a DPF this procedure is referred to as ‘regeneration’ the gathered soot is burnt off at substantial temperature to depart only a little ash residue. Regeneration might be both passive or lively.
Passive regeneration – Passive regeneration normally takes location instantly on motorway-variety runs when the exhaust temperature is substantial. Numerous autos do not get this type of use however so companies have to layout-in ‘active’ regeneration in which the motor administration computer (European) will take control of the process.
Lively regeneration – When the soot loading in the filter reaches a set restrict (about 45%) the Ecu can make modest adjustments to the fuel injection timing to improve the exhaust temperature and initiate regeneration. If the journey’s a bit stop/commence the regeneration may not full and the warning gentle will illuminate to display that the DPF is partially blocked.
It ought to be attainable to commence a total regeneration and distinct the warning light just by driving for 10 minutes or so at speeds better than 40mph.
If you overlook the mild and keep driving in a relatively slow, quit/start sample soot loading will continue to construct up until all around 75% when you can count on to see other dashboard warning lights illuminate way too. At this point driving at pace on your own will not be sufficient and the car will have to go to a seller for regeneration.
If warnings are still ignored and soot loading continues to improve then the most likely final result will be a new DPF costing around £1000.
Mainly city based driving
If your very own vehicle use or lease car use is primarily town-primarily based, end/start off driving it would be sensible to decide on petrol rather than chance the trouble of incomplete DPF regeneration.
The most widespread kind of DPF functions an built-in oxidising catalytic converter and is found extremely close to the motor the place exhaust gases will nonetheless be fairly sizzling so that passive regeneration is achievable.
There is certainly not constantly area shut to the engine even though so some manufacturers use a distinct sort of DPF which relies on a gasoline additive to decrease the ignition temperature of the soot particles so that the DPF can be positioned additional from the motor.
The additive is stored in a different tank and is routinely mixed with the fuel every time you fill up. Very small quantities are necessary however so a litre of additive need to treat about 2,800 litres of fuel, adequate to include 25,000 miles at 40mpg.
With this sort of DPF regeneration will be initiated by the Ecu each and every 300 miles or so depending on car use and will just take five to ten minutes to complete. You shouldn’t observe anything other than possibly a puff of white smoke from the exhaust when the approach is finished.
The AA has witnessed proof of DPF programs failing to regenerate – even on cars – that are utilized mainly on motorways. Their summary is that on automobiles with a really higher sixth gear engine revs are also lower to create ample exhaust temperature, but occasional more challenging driving in reduce gears ought to be sufficient to bum off the soot in this kind of instances.
Examine the handbook
If you get or lease a automobile with a DPF equipped it is crucial to go through the relevant section of the car handbook so that you recognize exactly what actions to just take if the warning mild illuminates and how, if at all, your driving type might want to be modified to make certain highest DPF performance and life.