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Author Topic: What is Delta?  (Read 3333 times)
opticaltrigger
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« on: January 31, 2017, 04:15:31 PM »

I read through the FR and keep seeing references to delta in many of the sections.
But I have to hold my hands up here and admit that I don't really understand what this means which frustrates me because I want to.

Can anyone shed some light on this or at least point me in the direction so that I can better understand it?
In particular I'm trying to get a handle on knock control,and I recall that in dockalani's great post on "what is knock voltage" a comment was made that knock voltage is irrelevant to the level of knock and that it is a result of delta.I really want to better understand this 

All the best guy's
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nyet
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« Reply #1 on: January 31, 2017, 04:29:50 PM »

delta = difference.

It is a general term.

Might want to head back to school and take some math classes Tongue
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opticaltrigger
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« Reply #2 on: January 31, 2017, 05:14:47 PM »

delta = difference.

It is a general term.

Might want to head back to school and take some math classes Tongue

Ahh...........Nyet.
Ok... so in the case of the knock voltage please tell me then exactly why the knock voltage is irrelevant?
How can it possibly be irrelevant?...... If it's based on delta or difference,then difference from what?

And thanks so much for your constructive suggestion of retaking math but I'll pass.
And in any case Nyet, I don't think any amount of math classes is going to help me in any way understand the specific correlation between "difference" and knock amplitude.Let alone how ME7.5 computes the appropriate action to be taken in response to it.

Perhaps you have some more of those invaluable and constructive,confidence building comments that so help us noobs down here in the NefMoto basement called the "noob" section where apparently "There are no dumb questions, just bad answers!"
Or perhaps you just have a technically biased and constructive comment on the subject matter in hand.
 
« Last Edit: January 31, 2017, 06:19:12 PM by opticaltrigger » Logged

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nyet
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« Reply #3 on: January 31, 2017, 06:18:01 PM »

Ahh...........Nyet.
Ok... so in the case of the knock voltage please tell me then exactly why the knock voltage is irrelevant?
How can it possibly be irrelevant?...... If it's based on delta or difference,then difference from what?

http://www.nefariousmotorsports.com/forum/index.php?topic=444.msg3219#msg3219

"delta" is just plain wrong in this context, I have no idea why he used that term.

The knock sensors get a ton of filtering (notch filter, cyl window) etc.

The reported voltage is totally irrelevant.

Quote
And in any case Nyet I don't think any amount of math classes is going to help me in any way understand the specific correlation between "difference" and knock amplitude

You're wrong. You might learn about FFTs, notch filters, etc.

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