What does low EGR mean

stevenchi
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What does low EGR mean

Post by stevenchi » Wed Sep 08, 2021 6:41 am

Low EGR %, in which state it will have a value, what does the value represent

Thank you :D :D

Steven

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Re: What does low EGR mean

Post by admin » Wed Sep 08, 2021 2:25 pm

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

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Fri Sep 10, 2021 2:20 am

understood!

Thank you

steven

stevenchi
Posts: 13
Joined: Wed Sep 08, 2021 5:01 am

Re: What does low EGR mean

Post by stevenchi » Sat Sep 11, 2021 1:12 pm

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?
Attachments
2.PNG
1.PNG

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Re: What does low EGR mean

Post by admin » Sun Sep 12, 2021 12:23 pm

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.

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Mon Sep 13, 2021 5:52 am

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

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Tue Sep 14, 2021 5:51 pm

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
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Screenshot_20210914-213224_VAG DPF.jpg

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Re: What does low EGR mean

Post by admin » Tue Sep 14, 2021 5:57 pm

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.

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Wed Sep 15, 2021 7:03 am

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

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Re: What does low EGR mean

Post by admin » Wed Sep 15, 2021 8:40 am

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.
Attachments
photo_2021-09-15_08-38-03.jpg
photo_2021-09-15_08-38-07.jpg

stevenchi
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Joined: Wed Sep 08, 2021 5:01 am

Re: What does low EGR mean

Post by stevenchi » Wed Sep 15, 2021 1:01 pm

Thank you very much for your assistance
Attachments
Screenshot_20210915-185736_VAG DPF.jpg
Screenshot_20210915-185740_VAG DPF.jpg

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Tue Sep 21, 2021 4:58 am

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


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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
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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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admin
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Re: What does low EGR mean

Post by admin » Tue Sep 21, 2021 12:10 pm

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.

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Wed Sep 22, 2021 8:48 am

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.

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Re: What does low EGR mean

Post by admin » Wed Sep 22, 2021 11:53 am

Ok clear, so it's a normal behavior, good

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Wed Sep 22, 2021 4:56 pm

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

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Re: What does low EGR mean

Post by admin » Thu Sep 23, 2021 5:09 pm

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.

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Wed Sep 29, 2021 2:21 am

So dpf has two injectors for accelerating combustion, right

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Re: What does low EGR mean

Post by admin » Wed Sep 29, 2021 8:44 am

The injectors are the same used for the normal injections (one for every cylinder) but they can be commanded more than one time for cycle: you have the main injection containing the fuel quantity required by the accelerator, moreover the ECU can command up to 3 pre-injections and up to 3 post-injections in the same cycle. These additional injections were introduced to reduce the engine emissions, to reduce the noise, to increase the performance and to optimize the efficiency. With the introduction of the DPF systems, the post injections were used to increase the gas temperature and then to burn the accumulated soot.

stevenchi
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Re: What does low EGR mean

Post by stevenchi » Fri Oct 01, 2021 2:26 am

I don’t know what you said about mg/std injector action

Is there a video or animation

Does the fuel injector inject more fuel in each stroke and regenerate at dpf?

Is this fuel injector the one above the piston and cylinder?

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