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Author Topic: Actual pre-control in LDRPID  (Read 50639 times)
soul87
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« Reply #255 on: July 31, 2019, 01:08:18 AM »

Yeah but for example limiting Imax for max boost at 4000rpm after gear change for prevent spike will limit Imax also when I will go on full boost from low rpm (3000) to max rpm (6000) ... and passing 4000rpm region it will in some way disable I positive adaptation in this range because of lower Imax...

I agree with using I for limiting boost spike but for me its stupid design that I always start from Imax not from I directly from KFLDIMX>KFLDRL giving a LDDIMXN to work only if its needed...
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nyet
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« Reply #256 on: July 31, 2019, 02:04:01 AM »

Yep. You'll have to choose a happy medium. Some overshoot is always needed to bring I back down if it isn't capped. Its the nature of PIDs.
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prj
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« Reply #257 on: July 31, 2019, 01:02:29 PM »

1. You should not use positive adaptation.
2. During spool IMAX is irrelevant because all the DC comes from P/D, IMAX is irrelevant until you go into steady state.
3. If you do the linearization runs correctly and tune correctly you will not have any boost spikes.
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nyet
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« Reply #258 on: July 31, 2019, 03:45:20 PM »


2. During spool IMAX is irrelevant because all the DC comes from P/D, IMAX is irrelevant until you go into steady state.


But as soon as it approaches target, p and d approach zero, and i is already maxed due to windup, so by definition it has to bounce off the imx.
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

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 experience.
soul87
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« Reply #259 on: July 31, 2019, 11:29:02 PM »

1. You should not use positive adaptation.

I know.

Question is for what is the LDDIMXN for... it add a constant number to imax, why ?
Its a I positive regulation limit? I belive no
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prj
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« Reply #260 on: August 01, 2019, 12:39:58 AM »

But as soon as it approaches target, p and d approach zero, and i is already maxed due to windup, so by definition it has to bounce off the imx.

I does not always have to be maxed due to windup.
But regardless, if you use the approach outlined in the OP, and you actually have the correct DC through LDRL, and have D set correctly, then just before reaching peak it will do a spike down in DC to stabilize and then it will just track the target.


I know.

Question is for what is the LDDIMXN for... it add a constant number to imax, why ?
Its a I positive regulation limit? I belive no

It simply is there to add a constant number instead of having to modify the whole table.
You can set it to zero.

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marto7
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« Reply #261 on: August 29, 2019, 12:21:57 PM »

I read all 18 pages in this topic, and still not sure how to take logs. What logs i need to use in the GUI tool ? From what i understand i need to change WGDC map(KFLDRL). First when i use 10% everywhere. After that 20% everywhere, than 30,40,50,60,70,80%. Also i need to make LDDIMXN map to 0 everywhere. Am i right or no ?
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