What is Knock Voltage?

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dokalanyi

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	What is Knock Voltage? « on: November 15, 2016, 01:16:27 AM »

The reason I ask, is because I've seen 2 logs -- one mine, the other from the 1.8T community tune. Knock voltages are similar, however mine has timing being pulled, while the community one has no timing pull, so I assume negligible/NO knock.

What's the relationship between knock and knock voltage?


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prj

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	Re: What is Knock Voltage? « Reply #1 on: November 15, 2016, 01:50:18 AM »

None. It is irrelevant.
Knock detection is done based on delta at the correct knock window.


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nyet

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	Re: What is Knock Voltage? « Reply #2 on: November 15, 2016, 01:58:25 AM »

Quote from: prj on November 15, 2016, 01:50:18 AM

None. It is irrelevant.
Knock detection is done based on delta at the correct knock window.

And a notch filter as well.


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dokalanyi

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	Re: What is Knock Voltage? « Reply #3 on: November 15, 2016, 03:10:59 AM »

Thanks Nyet and Prj. Although the only thing I've understood is "None. It is irrelevant."


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opticaltrigger

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	Re: What is Knock Voltage? « Reply #4 on: November 17, 2016, 03:02:55 PM »

Quote from: nyet on November 15, 2016, 01:58:25 AM

And a notch filter as well.

Out of curiosity, whats the stop band parameters on this filter and where is it in the circuit?

O.T.


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	Re: What is Knock Voltage? « Reply #5 on: November 17, 2016, 06:42:55 PM »

Quote from: opticaltrigger on November 17, 2016, 03:02:55 PM

Out of curiosity, whats the stop band parameters on this filter and where is it in the circuit?

O.T.

I wish I knew. I assume it is in the sensor itself, there is no way the ECU is fast enough to do a FFT for the required freq (i think).


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prj

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	Re: What is Knock Voltage? « Reply #6 on: November 17, 2016, 07:08:48 PM »

Uhm there is a separate knock processing chip on the board, the workings of which are explained in detail in the FR and in it's datasheet.


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opticaltrigger

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	Re: What is Knock Voltage? « Reply #7 on: November 19, 2016, 10:02:07 AM »

Thanks for the response guy's,
I see where your coming from with the FFT nyet and thanks for the heads up with FR prj. I'll go have a read.

All the best guy's
O.T.


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