Passive regeneration is an approach used to oxidise particulate matter (PM) in the diesel particulate filter (DPF). In contrast to higher temperature active regeneration, passive regeneration uses normal exhaust temperatures and nitrogen dioxide (NO2) as the catalyst to oxidise PM in the DPF.
At what of soot load passive regen will happen?
Passive Regen starts to occur at catalyst temperatures of about 270° C. Higher temperatures will increase the efficiency of Passive Regen with the most efficient Regen occurring anytime the temperature is above 550° C. When passive Regen occurs, it does not necessarily mean the soot level in the DPF goes down.
Is premium diesel better for DPF?
Use premium (expensive) fuel – This may be a contentious tip but the makers of the expensive versions of diesel claim that their fuels burn cleaner. Presuming that this is true, less unburnt fuel (soot) is likely to be produced, which benefits the DPF, especially in winter.
What are the three types of regeneration concerning diesel exhaust?
DPF filters go through a regeneration process which removes this soot and lowers the filter pressure. There are three types of regeneration: passive, active, and forced.
How long does a passive regen take?
Parked/Stationary regeneration is used when the Passive, Assist and Reset regenerations do not adequately reduce the soot in the soot filter. This process requires the operator or technician to start a Parked regeneration within the InfoCenter’s Service menu (it typically takes about 30 minutes).
How do you manually regenerate a DPF?
To kick off a manual DPF regeneration you should
- Put the vehicle in neutral.
- Put on the hand brake.
- Leave the pedals alone!
- Press and hold the DPF button for 2 seconds or longer.
What is the difference between active and passive regeneration?
Passive — This occurs when the load and speed of the engine produce temperatures greater than 350 degrees C, and it burns off the trapped soot as the vehicle operates. During active regeneration, raw fuel is injected into the diesel oxidation catalyst (DOC) to achieve appropriate regeneration temperatures in the DPF.
How many times can you regen a DPF?
Active regeneration will be initiated every 300 miles or so depending on how you use your car and will take 5 to 10 minutes to complete. But it’s a problem if your journey’s too short and the regeneration doesn’t finish.
How do I stop my DPF from clogging?
Our top five tips on keeping your DPF clean
- Drive Faster. Contrary to popular belief, driving faster could actually save you money in the long run.
- Use the right Oil.
- Get your EGR valve checked.
- Keep out of town.
- Buy the right car!
- Get clued up!
Can I clean a DPF myself?
Don’t DPFs clean themselves? In theory, yes. “Passive Regeneration” or if appropriate Active DPF regeneration will take place as part of a healthy diesel engine running cycle, but active regeneration can fail once a blockage reaches a certain level. Sometimes a “forced” regeneration may be carried out by a mechanic.
Can you regen while driving?
When everything is working as it should, regeneration occurs automatically while the vehicle is in motion, unnoticeable to the driver. Using the heat of the exhaust itself, soot is burned off the DPF often as quickly as it accumulates. This is known as passive regeneration.
