DPF Regeneration Questions
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DPF Regeneration Questions
All . . . . I have low mileage problems with my truck that may be related to the generation of the diesel particulate filter. I have the following questions . . .
Are there two kinds of DPF regeneration systems, i.e. an active, and an inactive?
When do the regeneration systems work?
When do they start and when do they stop?
Is the inactive system on all of the time?
How do the engine exhaust temperatures respond to the regeneration processes? Typical values?
Thanks . . . . ken
Are there two kinds of DPF regeneration systems, i.e. an active, and an inactive?
When do the regeneration systems work?
When do they start and when do they stop?
Is the inactive system on all of the time?
How do the engine exhaust temperatures respond to the regeneration processes? Typical values?
Thanks . . . . ken
Post Fiend
Joined: Apr 2004
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From: North of Salt Lake City
The correct terminology is Active and Passive regeneration. The truck is capable of keeping the DPF clean all the time by itself if you drive in such a way that your exhaust temps are high and you are not flooring the go pedal. Think towing a good load but not racing up Eisenhower pass. This is the passive regeneration. The exhaust temps are high enough to burn out the accumulating soot.
Most of us don't drive like that and the truck has to take an active role in burning out the soot. When the computer detects a filling DPF, it "turns on" the Active regeneration process which is to inject diesel fuel into the exhaust stream which then burns at a very high temperature. This burns out the soot and cleans the exhaust filter.
Most of us don't drive like that and the truck has to take an active role in burning out the soot. When the computer detects a filling DPF, it "turns on" the Active regeneration process which is to inject diesel fuel into the exhaust stream which then burns at a very high temperature. This burns out the soot and cleans the exhaust filter.
Senior User
Joined: Jun 2009
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Epic has a good description there, just to add a bit...
Typically an active regen will last 10 to 15 minutes on the highway. If I'm running 550-600 degrees rolling down the highway the EGT will go up to 700+ while regen is active, this is on sensor #1. Sensor #4, which is the sensor closest to the tailpipe, the DashDaq monitors will typically climb to 1100-1200 degrees while regen is active.
Typically an active regen will last 10 to 15 minutes on the highway. If I'm running 550-600 degrees rolling down the highway the EGT will go up to 700+ while regen is active, this is on sensor #1. Sensor #4, which is the sensor closest to the tailpipe, the DashDaq monitors will typically climb to 1100-1200 degrees while regen is active.
Postmaster
Joined: Aug 2011
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From: Roll Tide, Roll
In addition to that if you constantly do short drives and it can't get cleaned out it will eventually give you a drive to clean exhaust message.then you will need to take out and give it just a good long drive.If you get to that point it will take a good while to get dpf clean.
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