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Title: What is Knock Voltage? Post by: dokalanyi 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? Title: Re: What is Knock Voltage? Post by: 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. Title: Re: What is Knock Voltage? Post by: nyet on November 15, 2016, 01:58:25 AM None. It is irrelevant. Knock detection is done based on delta at the correct knock window. And a notch filter as well. Title: Re: What is Knock Voltage? Post by: dokalanyi on November 15, 2016, 03:10:59 AM Thanks Nyet and Prj. Although the only thing I've understood is "None. It is irrelevant."
Title: Re: What is Knock Voltage? Post by: opticaltrigger on November 17, 2016, 03:02:55 PM 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. Title: Re: What is Knock Voltage? Post by: nyet on November 17, 2016, 06:42:55 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). Title: Re: What is Knock Voltage? Post by: prj 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.
Title: Re: What is Knock Voltage? Post by: opticaltrigger 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. |