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Author Topic: LAMBTS Algorithm  (Read 30148 times)
dgpb
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« Reply #30 on: March 01, 2016, 02:01:31 PM »

Well guys. I've finally been able to get Me7Logger working by fighting with fuses 11 and 15 and the ignition.

Logged lambts_w, lamfa_w, lamsbg_w, lamsoni_w, tabgbts_w, tabgm_w, talsuf, tavvkm_w and tikatm_w

As I suspected TABGBTS sets a point (with DTBTS histeresys to unset) where LAMBTSENABLE activates and sets flbts_w. That enables LAMBTS. But it keeps lambts_w stoichiometric as FBSTABGM is multiplying by 0 until 900ºC.

I logged those other exhaust temperatures to ensure that I was no exceeding safety values in any component (The highest point I saw was 840ºC is it ok?)

That means that below 3680rpm I was running on lamfa_w (equals to lamsbg_w, final requested lambda). Passed that point tabgbts_w goes above 900ºC and lambts_w enables effectively (equals to lambsg_w)



Things cleared now, time to keep documenting my project. Aaaand you were right guys, VCDS sucks compared to ME7L, It's a shame that connecting is so time consuming... I even had to reset the airbag after all the process. Is putting a direct K-Line really the only way to make it simpler?
« Last Edit: September 02, 2016, 05:51:54 PM by diegogpb » Logged
nyet
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« Reply #31 on: March 01, 2016, 02:08:42 PM »

Excellent! Thanks for the update.

I'd appreciate any feedback on the s4wiki BTS section that you think needs work.

TIA!
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dgpb
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« Reply #32 on: March 01, 2016, 02:12:11 PM »

Excellent! Thanks for the update.

I'd appreciate any feedback on the s4wiki BTS section that you think needs work.

TIA!

Of course nyet, this night I'll take a look of it to post here my advices (Or via PM if you prefer)
« Last Edit: March 01, 2016, 02:26:34 PM by diegogpb » Logged
dgpb
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« Reply #33 on: March 03, 2016, 02:11:17 PM »

I had no time for taking a look at s4wiki. But I don't forget about it.

Let's see if this days I can do it.
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dgpb
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« Reply #34 on: March 16, 2016, 05:23:55 PM »

As nyet suggested, I took a look at this section on S4wiki. Although LAMBTS seems to be a little short and superficial, compensates it very well in the EGT subsection.

The only things that I think could improve the wiki even more are the following (from my point of view):

Don't blindly trust TABGBTS, as FBSTABGM is usually 0 on its first column. So if TABGBTS is 400ºC and FBSTABGM has a 0 as its first value (let's say at 900ºC), then FBSTABGM is the real trigger.

tabgbts_w (Calculated exhaust gas temperature for component protection) is very pessimistic. Higher than the rest of calculated temperatures, likely higher than real temperature too.


Regards.
« Last Edit: March 16, 2016, 05:51:54 PM by diegogpb » Logged
dgpb
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« Reply #35 on: March 16, 2016, 05:45:57 PM »

BTS is disabled if FBSTABGM == 0.

If the output is zero, a condition bit is set and evaluated the same as the other enabling condtions. When set, the map lookups are skipped and output is automatically 1.

To answer your previous question, yes, modeled egt is corrected for ignition angle efficiency.

Mate, I just realized about this part of your answer. Thanks a lot!
« Last Edit: March 18, 2016, 04:14:52 AM by diegogpb » Logged
nubcake
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« Reply #36 on: March 17, 2016, 03:38:42 PM »

tabgbts_w (Calculated exhaust gas temperature for component protection) is very pessimistic. Higher than the rest of calculated temperatures, likely higher than real temperature too

Just to illustrate this statement, a piece of today's log from my rs6. It's not a stocker, running bigger turbos with an unfinished tune. You can see that the model is fairly accurate, being a bit "slow-ish" for high load pulls, but that's most likely just my setup.
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nyet
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« Reply #37 on: March 17, 2016, 04:30:50 PM »

If you do the same with a bone stock car, you'll see that the model is actually very very accurate.
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
dgpb
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« Reply #38 on: March 24, 2016, 11:16:36 AM »

One of my best friends has recently bought an AQX ibiza, 6k0906032. I was taking a look at his stock file and that thing goes always in BTS.

TABGBTS 100ºC
FBSTABGM always 1

I knew some cars were programmed like this from factory but I had never worked with one of them until now. It's interesting to see different stock strategies.
« Last Edit: March 24, 2016, 02:03:13 PM by diegogpb » Logged
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