Regen Question
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Regen Question
So i drove 140 miles round trip, through a mtn pass to go snowboarding yesterday. No traffic, 70MPH + most of hte time, with dips down to 50, but not below that.
I check my DPF % this morning, and it's at 90%. Seems odd it would be this high after 2 hours of highway driving.
So i hop on the freeway and drive an hour straight at 75MPH , even locked out the top 2 gears so it ran closer to 1800/2000 rpm.
So, DPF screen not moving....as i'm getting home..it goes up to 95%.
Am I missing something here? Why wouldn't it have gone into passive regen over the course of the last 3 hours of highway driving?
What happens when I leave to head up to the mountain again and it hits 100?
I check my DPF % this morning, and it's at 90%. Seems odd it would be this high after 2 hours of highway driving.
So i hop on the freeway and drive an hour straight at 75MPH , even locked out the top 2 gears so it ran closer to 1800/2000 rpm.
So, DPF screen not moving....as i'm getting home..it goes up to 95%.
Am I missing something here? Why wouldn't it have gone into passive regen over the course of the last 3 hours of highway driving?
What happens when I leave to head up to the mountain again and it hits 100?
Senior User
Joined: Mar 2014
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You may be over thinking this, it handles Regen regardless of what you are doing, if you head back into the mountains and it gets to 100% it will Regen, you won’t notice much except higher fuel burn.
back to your driving conditions, just cruising along on the highway exhaust temps are low, so you build particulate relatively rapidly, might need a Regen after 300 or 400 miles. So you saw the increase to 90%.
when you went back out and drove it in lower gears, your EGT’s were probably higher, so you build particulate slower, so it only increased a little bit, most likely you were burning off some particulate as you drove, but not quite as much as you were making, close, but not quite.
enjoy the truck, it will mange this process just fine without you paying much attention.
back to your driving conditions, just cruising along on the highway exhaust temps are low, so you build particulate relatively rapidly, might need a Regen after 300 or 400 miles. So you saw the increase to 90%.
when you went back out and drove it in lower gears, your EGT’s were probably higher, so you build particulate slower, so it only increased a little bit, most likely you were burning off some particulate as you drove, but not quite as much as you were making, close, but not quite.
enjoy the truck, it will mange this process just fine without you paying much attention.
Tuned
Joined: Oct 2019
Posts: 362
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From: Lowcountry
I have rarely seen passive regen displayed on the instrument cluster DPF %. There are two types of soot % calculations, opened loop and closed loop. The truck displays the open loop calculation. There are monitors that will display the closed loop and I have seen passive regen when monitoring the closed loop PID.
Also, where you towing any significant weight? You are more likely to see passive regen when working the truck hard.
Also, where you towing any significant weight? You are more likely to see passive regen when working the truck hard.
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okay, thanks for the replies. final question(s).
Would it be correct to say that the truck will for sure go into regen when it his 100%?
Also, would it be correct to say that the truck only enters regen at 100%, unless working the truck hard enough to hit passive regen?
I mistakenly thought the truck would go into regen mode to avoid ever hitting 100%, rather than...building up to 100% then starting regen...
Would it be correct to say that the truck will for sure go into regen when it his 100%?
Also, would it be correct to say that the truck only enters regen at 100%, unless working the truck hard enough to hit passive regen?
I mistakenly thought the truck would go into regen mode to avoid ever hitting 100%, rather than...building up to 100% then starting regen...
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Joined: Aug 2008
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From: Frederick, MD
truck will regen when it wants. Of course if it gets to 100% then it certainly will do an active regen. Working the truck with temps hot enough to passively regen will usually prevent an active regen.
Passive regen temps would need to be hot enough to burn the soot off faster then the build up of the soot.
Passive regen temps would need to be hot enough to burn the soot off faster then the build up of the soot.
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tseekins
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Aug 29, 2013 10:10 AM
