DPF Reset Audi A4 8K CJCD: Adjustment & Calibration

Hi there,
There is something on top of the engine.
a) Reset the "Particle Filter Initialization" APK value to 0 km, as it currently shows a mileage of approximately 70,000 km.
b) The basic settings function "Reset the particle filter learning values."
How would one perform an ash mass balance check here? For a new DPF, set the APK (ash percentage) to the current mileage. For a cleaned DPF, set it to a slightly lower value to simulate accumulated mileage.
Does the default settings function involve resetting the soot values?
Service regeneration is available both in the initial settings and during adjustment (service generation while driving, with a stored value of 0).
I didn't find this topic to be very specific here.
hg
Herbert.

I've only done this procedure once before, on a Sharan 7N. After cleaning the DPF, I set the initialization to 20,000 km. I didn't adjust any of the learned values.

The initialization always shows 0 unless you actively enter something there... but after restarting, it's back to zero, although the loaded data has obviously changed then.

Hi Herbert,

I'm quite sure it's (a). Since everything depends on the specific control unit or engine, but it's always best to include a car scan and Screenshot so I can provide more informed advice.

Sure, here is the translation of the text from German to English:

"Background information:"
Ash mass matching or ash volume matching in TDI engines

Best regards, Rainer.

Hi there,
"@ Matthias - assuming the theoretical ash loading is 1 ml per 1000 km, then an input of 0 km would result in an entry of 0 ml, and an input of 20,000 km would result in an entry of 0.2 ml?"

"@Dieselschrauber - Providing the data from the MSG along with an image would be more helpful, and I plan to post that here soon."

hg
Herbert.

Yes, that's how it was. I regenerated the filter, removed it, and flushed it. Then, with the settings at 20,000 km, it resulted in 0.2 ml. The regeneration cycles seemed reasonable, so I didn't change anything else after that.

I'm sure you don't get everything out of it.

Here is the excerpt from the Autoscan and the MSG image.
Screenshots are failing due to open input masks.
hg
Herbert.

Hi Herbert,

I'm guessing it's "IDE00275 - Particle filter initialization," as that seems to be the only value that makes sense in this context.

Just try entering the corresponding value, then read it normally from the control unit, wait a bit, turn the ignition off and on, take a test drive, and check the ash volume or mass. I'm not sure if turning the ignition off and on and driving is really necessary; it depends on how and when the ash values are updated. However, it shouldn't cause any harm.

The "Print Screen" (PrtSc) key copies the screen content as an image to the clipboard. It can then be pasted into any drawing program using Ctrl+V.

Best regards, Rainer.

Hi,
Matthias already did that on the Sharan 7N.
Since
I probably won't change it until the DPF needs to be replaced or cleaned.
I just want to get a handle on the currently somewhat frequent regenerations and understand the difference between "calculated soot mass" and "measured soot mass." With the current regeneration rate of 17g down to 4g after 220 km, it will regenerate again soon.
hg
Herbert.

Quote:

I would like to get a better understanding of the currently somewhat frequent regenerations and the difference between "soot mass calculated" and "soot mass measured." With the current values of 17g decreasing to 4g after 220 km, it will regenerate again soon.

Hmm, I'm not aware of any other way to manipulate the ash content or ash volume figures.

Have you checked if the values from the differential pressure sensor are reasonable, especially when the system is in a standstill state?

"Perhaps someone has data on the amount of soot buildup at which regeneration starts in a similar engine, so we can estimate whether regeneration is starting at unusually low levels of soot."

Can you rule out the fuel tank as a cause? I once had an issue where I got "funny" fuel, and I could see a Russian truck in my rearview mirror because the engine didn't have a DPF. After filling up elsewhere, everything was fine again. Since it happened repeatedly, I'd rather not know what was actually in the tank at that time. It's also possible that a DPF is filling up too quickly.

Best regards, Rainer.

The differential pressure at standstill is 1 hPa, with an offset of 0 hPa.
Regeneration begins at approximately 23 grams (calculated value). Any potential impurities from the gas station should be reflected in the measured value.
Sure, here's the translation:

"Best regards," or "Sincerely," (depending on the context).
Herbert.

Good evening.
And here is a Screenshot of the possible default configuration routines. The APK files are as shown in the image.
I'm considering waiting for the next regeneration cycle and then resetting the learned values of the DPF to bring both values for soot mass as close to zero as possible (i.e., measured soot mass and calculated soot mass).
What do you mean?
hg
Herbert.

Hello Herbert.

Okay. Is the charge air cooler system airtight? If you have time, could you run a full-throttle log from 1500 to 4000 rpm, recording engine speed, actual boost pressure, and actual airflow? I would then create a function showing the relationship between actual boost pressure and actual airflow as a function of engine speed. This could help determine if there's a leak in the charge air cooler system or if the EGR valve isn't closing properly, especially when comparing engines with similar mechanics and displacement.

Best regards, Rainer.

Hi Rainer,
Sure, I can do that, but it will take until the weekend.
Could you explain your thought process to me?
hg
Herbert.

At a specific engine speed, a certain amount of air is drawn in for each unit of boost pressure.
Mechanically similar engines should be compared in such a way that visible deviations can reveal leaks in the charge air system or AGR valves that are not closing properly. Both of these could be reasons why the DPF in your engine is regenerating unusually often.

Best regards, Rainer.

Hi there,
Attached is the log data showing engine speed, target vs. actual boost pressure, air mass, differential pressure, etc.
It was fully accelerated twice in the fourth gear: once from approximately 1800 RPM to 4000 RPM, and once from about 1500 RPM to 3500 RPM. It can be a bit challenging to drive on the highway during rush hour.
The CSV file is the original, while the XLSX file has been cleaned and filtered to include only the specified sections.
I tried resetting the learning parameters specifically for that purpose.
hg
Herbert.

Do deviations between the target and actual values of LM (likely meaning "Load Management" or a similar parameter) indicate a leak when the LD (likely meaning "Line Drop" or a similar parameter) is high?
If so, I will start a new thread.
Okay, please provide the German text you would like me to translate into English. I will only provide the translation.