What is Knock Voltage?

Pages: [1]

« previous next »

Author

Topic: What is Knock Voltage? (Read 4724 times)

dokalanyi

Full Member

Karma: +4/-1
Offline

Offline

Posts: 119

	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?


	Logged

prj

Hero Member

Karma: +1072/-480
Offline

Offline

Posts: 6035

	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.


	Logged

PM's will not be answered, so don't even try.
Log your car properly - WinOLS database - Tools/patches

nyet

Administrator
Hero Member

Karma: +607/-168
Offline

Offline

Posts: 12268

	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.


	Logged

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

dokalanyi

Full Member

Karma: +4/-1
Offline

Offline

Posts: 119

	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."


	Logged

opticaltrigger

Full Member

Karma: +3/-0
Offline

Offline

Posts: 80

	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.


	Logged

"It is dangerous to be right, in matters where established men are wrong." ....

Voltaire

nyet

Administrator
Hero Member

Karma: +607/-168
Offline

Offline

Posts: 12268

	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).


	Logged

prj

Hero Member

Karma: +1072/-480
Offline

Offline

Posts: 6035

	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.


	Logged

PM's will not be answered, so don't even try.
Log your car properly - WinOLS database - Tools/patches

opticaltrigger

Full Member

Karma: +3/-0
Offline

Offline

Posts: 80

	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.


	Logged

"It is dangerous to be right, in matters where established men are wrong." ....

Voltaire

Pages: [1]

« previous next »

Jump to:

Navigation

Personal Tools

November 24, 2024, 03:40:29 PM

Welcome, Guest. Please login or register.
Did you miss your activation email?

Navigation

Personal Tools

Search