Knock control value
Posted: Sat Oct 07, 2023 10:55 pm
I understand the overall ignition timing and knock control calculations, but the actual “knock control” value used in those calculations and displayed/logged as KNK.CTRL is still a bit of a mystery. On a guess I expected to see it driven by knock count, rising when knock is detected then falling quickly as knock is suppressed. What I see in the logs is a continuous series of spikes up then very gradual falls with no change in knock count. In the screenshot, red is knock count, green is knock control and light blue is intake air temp to confirm it isn’t somehow correlated (nor is coolant temp).
So, what drives the knock control value? Or is it really knock after all but that’s not being captured as an increasing count?
https://photos.app.goo.gl/J8BekVhBfF4dwupX8
So, what drives the knock control value? Or is it really knock after all but that’s not being captured as an increasing count?
https://photos.app.goo.gl/J8BekVhBfF4dwupX8