I have noticed something rather strange about 'Soot Mass Measured' levels while watching the value for a longer time.

 

So it goes like this:

Value rising way quicker than 'Soot Mass Calculated' during normal drive and as soon as I keep driving above 2600-3000RPM, the value starts going down ( no passive regen happening ! EGT below 370-400 deg Celsius ). 

 

Any idea why this might be happening?

That is a passive regeneration, anywhere between 350°c and 500°c, active regeneration raises the exhaust temperature to 600°c.

 

At 50% soot loading the regen temp rises to 650°c.

 

Unless you have problems then unplug the bloomin thing, let the emissions control systems take care of themselves and keep your eyes on the road!

That's why I mentioned that no passive regen is happening (even if I drive it in 1st gear, 3000RPM, 20km/h, it starts dropping). During a passive regen, Soot Mass Calculated also drops.

 

The problem is that if I drive it like a granny, the mileage between regens drops by around 50%, and is triggered by Soot Mass Measured and not Soot Mass Calculated.

Also, when turning on the engine for the first time (engine cold), this value also rises by about 1g in a few hundred meters. Something seems off to me, just can't figure out what.

Edited 9 June, 20223 yr by BogdanB

The regen will be triggered by whichever of the parameters reaches the 22.5g (probably) threshold, if your calculated figure drops then your vehicle has not had the emissions fix which is good news, the bad news is that your actual measured readings are going up faster than the calculated ones, on my car it would regen at 22.5 calculated but the measured was only ever 3g.

 

so it sounds to me like your DPF is pretty clogged with oil ash unless there is a problem with the differential pressure sensor or its adaptation, I think you said you have already done that, there are at least 2 different contributors both raising multiple threads clutching at straws hoping to be told that their DPF's are not actually clogged.

 

 

I've always wondered how some guys get those insane mileage between regens (some state 500kms or more) since the calculated value just climbs steadily and barely drops on passive regens ?