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Author Topic: Knock Control, Motronic 2.3  (Read 38596 times)
Acki
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« Reply #45 on: April 10, 2013, 05:13:32 AM »

I don't know it. Most ICs Google don't knows - the stuff is too old.
But however, there must be some connection between knock control (in which way ever it works) and fuel injection and DTCs.
Because there were DTCs from out of knock control etc - I guess the counter for the DTC is internal and it would be nice to know this "count" function to maybe see when it knocks...

I think the Philips CC151 V1 should be investigated... Smiley But didn't find information about this Sad
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prj
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« Reply #46 on: April 10, 2013, 05:28:12 AM »

DTC's are a different story, but on 2.2T at least there is no logic to diagnose anything related to knock control in the chip that you communicate with when you read DTC's...
Same like the main chip knows nothing about a MAP sensor. But there is logic for the two chips to talk... So when a fault code is detected the other chip sends a message at very high speed to the main chip and main chip stores it in fault memory.

I don't know how it is done in V8, but I imagine in a similar fashion, where the knock control chip does all the diagnosis.
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Acki
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« Reply #47 on: April 10, 2013, 10:33:18 AM »

I don't know.
But I tested the 551B software at my ABH ECM. Engine starts but don't runs very long.
How ever - diagnostic of throttle position works at VAG COM.
So I maybe only have to perform some copy and paste.
When it would be so easy. Sad
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karel5000
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« Reply #48 on: April 10, 2013, 12:22:51 PM »

I think he is speaking about his understanding of knocking and not about the function in the software.
The software only looks in a window before the next ignition event.
To don't get in trouble with other engine noise.
And also the level - louder combustion and higher revs.
But of course a knock event also depends on the load (VE) of the cylinder.
Lean mixtures need more ignition for example because flame front is slower.
Also the knock event is different "sound level" than at x bar of boost because much more energy knocks (detonation is the wrong word for it).
I guess he means this.

Yes. Exactly.

The knock windows, frequency and the level depends much on RPM. But it needs to be tuned very seldom...

If the knock maps are directly dependent of IGA, i find it nice and very flexible.

I would like to know, if there are even some corrections necessary but may be none is needed...
« Last Edit: April 10, 2013, 12:27:59 PM by karel5000 » Logged
prj
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« Reply #49 on: April 10, 2013, 03:20:53 PM »

Yes, there are some adjustments needed when you change MAP sensor. But not for the reasons you think...
Will work fine on WOT without.
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karel5000
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« Reply #50 on: April 11, 2013, 12:46:05 PM »

Yes, there are some adjustments needed when you change MAP sensor. But not for the reasons you think...
Will work fine on WOT without.

Well, can you tell me please why? The level, the dB bondary because of more noice?
Or because of the correct pressure steps during the knock control or the adaptation?
« Last Edit: April 11, 2013, 12:48:54 PM by karel5000 » Logged
prj
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« Reply #51 on: April 11, 2013, 01:53:33 PM »

Well, can you tell me please why? The level, the dB bondary because of more noice?
Or because of the correct pressure steps during the knock control or the adaptation?

No, it's not what you think. I will not say more about this, sorry.
If you want to know reverse engineer it in IDA pro.
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kaross
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« Reply #52 on: April 24, 2013, 02:32:43 PM »


Nothing to do with knock.


o.k. Can you give a hint what are these maps all changed to 128?

Found out where are located knock maps.
But don't know how they really works... Sad


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kaross
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« Reply #53 on: April 26, 2013, 01:56:12 PM »

everybody quiet. no replies, thoughts?
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