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What does low EGR mean

Posted: Wed Sep 08, 2021 6:41 am
by stevenchi
Low EGR %, in which state it will have a value, what does the value represent

Thank you :D :D

Steven

Re: What does low EGR mean

Posted: Wed Sep 08, 2021 2:25 pm
by admin
The value corresponds to the closing percentage of the EGR valve.

100% means that the valve is fully closed and the exhaust gas doesn't recirculate.
0% means that the valve is fully open and the exhaust gas recirculation is maximum.
All the intermediate values mean a partial gas recirculation.

You can read about the EGR here:
https://en.wikipedia.org/wiki/Exhaust_gas_recirculation

Re: What does low EGR mean

Posted: Fri Sep 10, 2021 2:20 am
by stevenchi
understood!

Thank you

steven

Re: What does low EGR mean

Posted: Sat Sep 11, 2021 1:12 pm
by stevenchi
Yesterday I used this software for the first time, there is no CZJA engine, I chose the system menu BY ECU but my LOW EGR is red light, is it the current software does not support this engine?

Re: What does low EGR mean

Posted: Sun Sep 12, 2021 12:23 pm
by admin
If the engine ins't in the supported engine list, there are 2 possibilities: the engine has been tested and it's not supported or it hasn't been tested.
In your case is the second option.
In your picture I see that all parameters are read correctly but the EGR value.
You should try to manually change the engine group in the options menu, maybe some other group makes the EGR values readable.
Some groups differ only in a few parameters, try every group and check if the EGR value is read.

Try and let me know.

Re: What does low EGR mean

Posted: Mon Sep 13, 2021 5:52 am
by stevenchi
In the menu, the setting of Read from ECU is corrected to GROUP 9. At that time, I will inform whether it is feasible

Thank You!

StevenChi

Re: What does low EGR mean

Posted: Tue Sep 14, 2021 5:51 pm
by stevenchi
Select the group 9 Low EGR so far there is no error message.
But one thing is that the Refresh status is not continuously updated. I have to press REFRESH bottom to complete the value display. What options do I need?

please see the photo

Re: What does low EGR mean

Posted: Tue Sep 14, 2021 5:57 pm
by admin
Good!

For the automatic update you simply have to tap on the dpf filter image.
You can also enable this function to be already on after the Bluetooth connection, see in the options menu.

If you want to make some log while driving, then send me the log file so I can analyze it and if everything will be ok, I'll add your engine to the supported engine list.

Re: What does low EGR mean

Posted: Wed Sep 15, 2021 7:03 am
by stevenchi
Please see the bellow Red


For the automatic update you simply have to tap on the dpf filter image.

Can mark which icon on the screen for automation update

You can also enable this function to be already on after the Bluetooth connection, see in the options menu.

Can mark which icon on the options menu.

If you want to make some log while driving, then send me the log file so I can analyze it and if everything will be ok, I'll add your engine to the supported engine list.

In general option make Write log can recording that I'll send you the data for analysis at that time

Re: What does low EGR mean

Posted: Wed Sep 15, 2021 8:40 am
by admin
These are the pictures for you.

The log recording can be enabled/disabled pressing the icon on the top right of the screen with the text "LOG" inside.
When the log is enabled you can see the icon below the filter dpf image.

Re: What does low EGR mean

Posted: Wed Sep 15, 2021 1:01 pm
by stevenchi
Thank you very much for your assistance

Re: What does low EGR mean

Posted: Tue Sep 21, 2021 4:58 am
by stevenchi
Save date(yyyy-MM-dd HH:mm:ss): 2021-09-17 08:55:47 / Application Release: VAG DPF v.3.18.8 / Log Format: 1.3
Time (ms) Soot Mass Calc. (g) Regen. Duration (min) Distance Since Last Regen. (km) Time Since Last Regen. (min) Oil Ash Residue (g) Low Press. EGR Closing (%) DPF Input Gas Temp. (°C) DPF Output Gas Temp. (°C) Soot Mass Measured (g) Post injection 2 (mg/str) Post injection 3 (mg/str) Differential Pressure (hPa) Distance driven (km)

1631861602539 18.19 0 179 307 2.2 76 159 147 7.62 0.00 0.00 18 8945
1631861605503 18.19 0 179 307 2.2 76 160 147 7.62 0.00 0.00 19 8945

Save date(yyyy-MM-dd HH:mm:ss): 2021-09-19 11:10:32 / Application Release: VAG DPF v.3.18.8 / Log Format: 1.3
Time (ms) Soot Mass Calc. (g) Regen. Duration (min) Distance Since Last Regen. (km) Time Since Last Regen. (min) Oil Ash Residue (g) Low Press. EGR Closing (%) DPF Input Gas Temp. (°C) DPF Output Gas Temp. (°C) Soot Mass Measured (g) Post injection 2 (mg/str) Post injection 3 (mg/str) Differential Pressure (hPa) Distance driven (km)
1632021032456 20.14 0 191 351 2.2 100 155 144 6.87 0.00 0.00 15 8957
1632021034935 20.14 0 191 351 2.2 100 155 144 6.87 0.00 0.00 15 8957
1632021037305 20.14 0 191 351 2.2 100 155 144 6.87 0.00 0.00 15 8957
1632021039603 20.14 0 191 351 2.2 100 154 144 6.87 0.00 0.00 15 8957
1632021041934 20.14 0 191 351 2.2 99 155 144 6.87 0.00 0.00 15 8957
1632021044247 20.14 0 191 351 2.2 100 155 145 6.87 0.00 0.00 15 8957


1632028852914 24.09 1 262 468 2.3 65 174 179 15.44 0.00 0.00 21 9029
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1632028857499 24.09 1 262 468 2.3 65 173 178 15.44 0.00 0.00 22 9029
1632028859873 24.10 1 262 468 2.3 65 173 178 15.44 0.00 0.00 22 9029
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1632028869392 24.10 1 262 468 2.3 58 177 175 15.45 0.00 0.00 33 9029
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1632028873953 24.11 1 262 468 2.3 100 181 174 15.46 3.24 2.86 37 9029
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1632029025270 24.19 4 264 471 2.3 100 308 302 15.58 3.03 1.50 36 9031
1632029027736 24.19 4 264 471 2.3 100 310 303 15.57 4.72 2.84 42 9031
1632029030010 24.20 4 265 471 2.3 100 314 303 15.57 1.39 1.50 36 9031
1632029032365 24.20 4 265 471 2.3 100 318 304 15.56 3.89 3.01 40 9031
1632029034792 24.20 4 265 471 2.3 100 324 304 15.56 5.00 3.56 46 9031
1632029037220 24.20 4 265 471 2.3 100 331 305 15.56 0.00 0.00 38 9031
1632029039712 24.20 4 265 471 2.3 100 336 306 15.55 5.31 3.95 46 9031
1632029042124 24.20 4 265 471 2.3 100 341 306 15.54 5.55 4.06 53 9031
1632029044548 24.20 4 265 471 2.3 100 345 307 15.53 0.00 0.00 44 9031
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1632029103289 24.21 5 266 472 2.3 99 343 324 15.40 2.22 1.50 47 9032
1632029105613 24.21 5 266 472 2.3 99 343 325 15.39 0.00 0.00 39 9032
1632029107933 24.21 5 266 472 2.3 99 342 325 15.39 0.00 0.00 39 9032
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1632029112550 24.21 5 266 472 2.3 100 342 326 15.38 0.00 0.00 38 9032
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1632029121959 24.22 6 266 472 2.3 100 344 329 15.34 4.04 2.04 45 9033
1632029124308 24.22 6 266 472 2.3 100 344 329 15.34 0.00 0.00 37 9033
1632029126739 24.22 6 266 473 2.3 100 343 329 15.34 2.95 1.50 39 9033
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1632029136359 24.22 6 266 473 2.3 100 335 330 15.30 0.00 0.00 38 9033
1632029138738 24.22 6 266 473 2.3 100 335 330 15.29 0.00 0.00 35 9033
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1632029180699 24.22 7 267 473 2.3 99 312 330 15.18 1.05 1.50 33 9033
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1632029243684 24.23 8 268 474 2.3 100 341 322 15.03 5.16 3.69 56 9034
1632029246085 24.23 8 268 474 2.3 100 345 322 15.03 0.00 0.00 42 9034
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1632029260527 24.23 8 268 475 2.3 100 356 323 15.03 0.00 0.00 38 9035
1632029262846 24.23 8 268 475 2.3 100 356 323 15.03 0.00 0.00 33 9035
1632029265274 24.23 8 268 475 2.3 100 355 323 15.02 4.34 2.65 37 9035
1632029267583 24.23 8 268 475 2.3 100 354 323 15.00 4.67 4.14 56 9035
1632029269930 24.23 8 268 475 2.3 100 353 324 14.99 5.74 3.94 65 9035
1632029272376 24.23 8 268 475 2.3 100 348 325 14.98 4.09 3.50 57 9035
1632029274786 24.23 8 268 475 2.3 100 344 326 14.97 4.84 2.94 54 9035
1632029277220 24.23 8 268 475 2.3 100 341 327 14.96 4.68 2.81 56 9035
1632029279484 24.23 8 268 475 2.3 100 339 327 14.94 4.53 2.72 58 9035
1632029281844 24.23 8 268 475 2.3 100 340 328 14.93 4.58 3.16 62 9035
1632029284186 24.23 8 268 475 2.3 100 342 329 14.92 4.49 2.38 46 9035
1632029286577 24.23 8 268 475 2.3 100 347 329 14.93 2.01 2.44 38 9035
1632029288955 24.23 8 268 475 2.3 100 351 329 14.92 1.26 1.50 35 9035
1632029291224 24.24 8 268 475 2.3 100 356 330 14.91 3.99 1.50 40 9035
1632029293562 24.24 8 269 475 2.3 99 361 330 14.90 4.27 2.46 43 9035
1632029295967 24.23 9 269 475 2.3 100 367 330 14.90 0.00 0.00 32 9035
1632029298362 24.23 9 269 475 2.3 99 371 331 14.90 0.00 0.00 29 9035
1632029300760 24.23 9 269 475 2.3 99 375 331 14.90 2.51 0.00 42 9035
1632029303077 24.23 9 269 475 2.3 99 379 331 14.90 0.00 0.00 40 9035
1632029305397 24.23 9 269 475 2.3 99 381 331 14.90 0.00 0.00 40 9035
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1632029319840 24.24 9 269 476 2.3 100 379 334 14.87 4.27 2.44 40 9035
1632029322321 24.24 9 269 476 2.3 100 374 335 14.86 0.80 0.00 32 9035
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1632029326992 24.24 9 269 476 2.3 100 366 336 14.85 0.00 1.17 45 9035
1632029329361 24.24 9 269 476 2.3 100 362 337 14.83 4.84 3.49 67 9035
1632029331742 24.24 9 269 476 2.3 100 360 338 14.82 0.80 1.42 39 9036
1632029334098 24.24 9 269 476 2.3 100 359 339 14.82 3.23 3.42 42 9036
1632029336416 24.24 9 269 476 2.3 99 358 340 14.81 0.00 0.00 34 9036
1632029338765 24.24 9 269 476 2.3 100 356 341 14.80 4.96 3.56 44 9036
1632029341029 24.24 9 269 476 2.3 99 355 341 14.79 0.00 0.00 34 9036
1632029343394 24.24 9 269 476 2.3 100 353 342 14.78 3.64 1.50 38 9036
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1632029350289 24.24 9 269 476 2.3 99 349 344 14.76 4.34 2.28 40 9036
1632029352818 24.24 9 269 476 2.3 99 349 344 14.76 3.13 1.18 35 9036
1632029355181 24.24 9 269 476 2.3 100 349 344 14.75 2.86 1.50 37 9036
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1632029362332 24.24 10 270 476 2.3 100 349 345 14.72 4.63 3.17 43 9036
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1632029367035 24.24 10 270 477 2.3 100 348 346 14.70 0.00 0.00 37 9036
1632029369325 24.24 10 270 477 2.3 100 347 346 14.70 0.00 0.00 32 9036
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1632029381037 24.24 10 270 477 2.3 100 343 347 14.66 2.54 1.50 37 9036
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1632029385668 24.24 10 270 477 2.3 100 341 347 14.65 1.83 1.47 38 9036
1632029388040 24.24 10 270 477 2.3 100 341 347 14.64 0.00 0.00 34 9036
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1632029392684 24.24 10 270 477 2.3 100 336 347 14.63 4.91 2.83 43 9036
1632029395130 24.24 10 270 477 2.3 100 333 346 14.62 5.53 4.03 58 9036
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1632029402149 24.24 10 270 477 2.3 100 322 345 14.59 4.75 2.50 48 9036
1632029404490 24.24 10 270 477 2.3 100 322 345 14.59 0.00 1.17 31 9037
1632029406742 24.24 10 270 477 2.3 100 322 344 14.58 0.00 0.00 29 9037
1632029409168 24.24 10 270 477 2.3 100 322 344 14.58 0.00 0.00 40 9037
1632029411547 24.24 10 270 477 2.3 100 325 343 14.58 0.00 1.25 39 9037
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1632029423058 24.24 11 270 477 2.3 100 346 340 14.54 5.03 3.79 68 9037
1632029425293 24.24 11 270 477 2.3 100 349 339 14.54 4.08 3.92 56 9037
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1632029429983 24.24 11 270 478 2.3 100 346 337 14.53 0.00 0.00 37 9037
1632029432368 24.24 11 270 478 2.3 100 344 337 14.53 0.00 0.00 34 9037
1632029434714 24.24 11 270 478 2.3 100 341 336 14.53 2.02 1.50 35 9037
1632029437015 24.24 11 271 478 2.3 100 339 335 14.52 0.00 1.47 35 9037
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1632029441615 24.24 11 271 478 2.3 100 338 334 14.52 0.00 0.00 31 9037
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1632029459963 24.24 11 271 478 2.3 100 347 331 14.49 0.00 0.00 32 9037
1632029462309 24.24 11 271 478 2.3 100 345 331 14.50 0.00 0.00 38 9037
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1632029471538 24.24 11 271 478 2.3 100 341 331 14.46 3.40 3.54 53 9037
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1632032163029 5.98 0 7 20 2.3 57 268 252 -9.59 0.00 0.00 16 9056
1632032165299 5.99 0 7 20 2.3 70 268 253 -9.59 0.00 0.00 17 9056
1632032167743 5.99 0 7 20 2.3 75 268 254 -9.58 0.00 0.00 18 9056
1632032170185 5.99 0 7 20 2.3 71 268 254 -9.57 0.00 0.00 17 9056
1632032172533 5.99 0 7 20 2.3 73 267 255 -9.57 0.00 0.00 20 9056
1632032174815 6.00 0 7 20 2.3 35 266 256 -9.56 0.00 0.00 19 9056
1632032177088 6.00 0 7 20 2.3 73 265 257 -9.56 0.00 0.00 20 9056
1632032179430 6.00 0 7 20 2.3 69 264 257 -9.56 0.00 0.00 20 9056
1632032181900 6.00 0 7 20 2.3 17 264 258 -9.55 0.00 0.00 17 9056
1632032184232 6.00 0 7 20 2.3 56 265 258 -9.54 0.00 0.00 17 9056
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1632032189030 6.01 0 7 21 2.3 41 270 258 -9.52 0.00 0.00 19 9057

Re: What does low EGR mean

Posted: Tue Sep 21, 2021 12:10 pm
by admin
I checked you log:
during the regeneration, for the first 14 minutes the gas temperature never goes above 400°C that is a very low temperature for the regeneration process. Consequently the "soot mass calculated" decreases very low.
After that I see the temperature reaching 500-550 °C and the soot starts to decrease a little, then the readings are spaced by many minutes and in only 3 rows the regeneration finishes apparently ok with correct values.
It's a little strange.

Globally the process seems ok, just a little slow, maybe due to a slow start with low temperatures.

The differential pressure maximum value seems low compared to my engine. With my DETA TDI I can see values above 400 hPa versus 71 hPa maximum of your engine, but I'm not really sure the 2 values are comparable if coming from different engines.

Re: What does low EGR mean

Posted: Wed Sep 22, 2021 8:48 am
by stevenchi
When running at a high speed of 100km/hr, the regeneration temperature is about 560 degrees and the regeneration is completed soon.

This time when I was born, I ran the mountain road at a speed of only 30-40km/hr, and it was indeed a long time to regenerate.

Re: What does low EGR mean

Posted: Wed Sep 22, 2021 11:53 am
by admin
Ok clear, so it's a normal behavior, good

Re: What does low EGR mean

Posted: Wed Sep 22, 2021 4:56 pm
by stevenchi
I would like to ask you another question, what does post injection 2 & post injection 3 mean?
What does the unit (mg/str) mean?

thanks

Re: What does low EGR mean

Posted: Thu Sep 23, 2021 5:09 pm
by admin
The value means the injected quantity for every engine combustion cycle (stroke).

The pre and post injections are used in modern engines to control the noise and to reduce pollution, but also to start and maintain the regeneration burning process. Especially the post injection 2 and 3 are dedicated to the regeneration, the injected quantity helps the filter to reach the soot self burning temperature with a double action: first they raise the gas temperature and second they allow the unburned fuel to reach the DPF filter in which it burns further raising the internal temperature.
When you see these values higher that 0, a regeneration is going to start or is running.