wow
New Member
Posts: 4
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Post by wow on Feb 17, 2020 11:07:23 GMT
Hello,
today I´ve looked at DPF related values. The DPF warning light was on each 250 km. I dismounted the DPF, cleaned it with a Kärcher and now I took a view to the DPF-values and would make a reset of the soot charging values. But the values are strange:
  
MSG_A12:
Value 1: 0rpm - ok, motor was off Value 2: soot mass/g: 0! The car has 144800km, we bought is with 144400km, how can be this value 0? How is this value determined? The DPF would not be weight. Calculated - by which formula? Value 3: Consumption since last regeneration: 4l - maybe correct. Value 4: Driven distance since last regeneration/km: 40. Strange. I made a test drive of 10 km and the value was unchanged at 40.
MSG_MW67:
Value 1: DPF-load/%: 21 - 21% of what? sood? ash? Both? How fit this 21% to 0g mass of ash of MSG_A12? Value 2: ash mass/g: 0 - How ist this value determined? calculated? How fit the 0g ash mass to the value 1 with 21% load? Value 3: Ash mass learning value/g or % - g and % do not fit together. What is the meaning of this value?
Then I made two meassurements of the DPF-differential pressure value: MSG_MW_67 at idle: Diff-pressure 2,55 (Unit?), offset 10,2 (Unit mbar?) MSG_MW_67 at 2000rpm in neutral position: Diff-pressure 12,75 mbar - ist this a reasonable value?
regards wow
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tomkasz
Closed beta tester
Posts: 31
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Post by tomkasz on Feb 24, 2020 19:36:40 GMT
Hello Wow, I don't have a T5.1, but I have a T6 2.0 tdi with DPF. In my case the data is downloaded by UDS, which I guess causes that I don't have to give the channel number (live data, long coding, adaptation, basic settings), I can find the values by filtering the text values. If you switch the application to English and give values that I would check, we could find out which sensor/etc. is not working correctly. For me, with a mileage of just over 40,000 km, I have DFP filter filled with ash (oil ash mass) at 13.05 g with an upper limit of 110.00 g regards, Tomkasz. PS Maybe it's 21% soot filling, and at 100% it's burning(?). In my T6, the whole process works like this ( Engine Control Module (01), live data):  Particulate filter ash load limit: 110.00 g - maximum possible ash filling. Particulate filter, oil ash mass: 13.05 g - current ash filling. Particulate filter, soot mass calculated: 13.98 g - current soot filling. This value increases to ~30 g, afterburning takes place (the amount of soot decreases, the amount of ash increases), the value decreases to ~8 g, afterburning stops. Particulate filter, soot mass measured: -0.36g - I haven't been able to explain it yet. It's been given quite strangely. A special case. When driving ~140 km/h, the DPF reaches a temperature of ~350 degrees (C), the soot value increases slowly and the ash value increases very slowly. I call this partial afterburning, formerly called passive. |
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wow
New Member
Posts: 4
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Post by wow on May 20, 2021 8:19:17 GMT
I saw, that I opened this DPF-Quetion last year and forgot to add my information I found. Now I will do it. MSG_A12: Value 1: 0rpm - ok, motor was off Value 2: wrong: soot mass/g This is wrong! Its the ash mass, displayed in gramms. To input a value - e.g. 10g - you must multiply it with 100. 1000 means 10g. 500 means 5g. Value 3: Consumption since last regeneration Value 4: Driven distance since last regeneration/km: MSG_MW68: Value 1: DPF-load/%: 21 - 21% of what? sood? ash? The answer is: Sood. It´s calculated by the electronic in dependance of the driven distance. Value 2: ash mass/g: Ash mass/g Value 3: Ash mass offset value/g. This is influenced by the Differential Pressure Sensor.
Hope, someone can use this info.
Regards WoW
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