John,
I don't wish to change the direction of this thread to discuss knock detection, but, I had also considered using a uC for this, however, how long does a 'knock' last? will the sample rate ever be fast enough to ensure capturing the peak? I suppose analysing a knock link is a good way to get some further info but I would have though that understanding how the std ECU reacts to different levels of knock would be more useful if you want to know how to integrate it into a Boost/Ignition 'optimiser'. Keep up the good work. Andrew... |
http://home.netcom.com/~bsundahl/kno...Rtb11_1_18.gif
http://home.netcom.com/~bsundahl/kno...nockSounds.htm 16ms on the top picture - they are the backslash \ light blue strokes at 6KHz. The Atmel 90S4433 runs at 8 MIPS and has an ADC conversion time of 65-260uS. I'll have a look at the signal processing that the Knocklink does at some point. No worry about going off topic - this is entirely on-topic! [Edited by john banks - 3/14/2002 3:09:01 PM] |
You could get an A'PEXi Power FC and fine tune it, would display knock and other ECU info...
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Spoils the fun though - I want to learn to do it myself :)
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You CAN do it yourself with the FC!
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No I mean design and build the circuits as well. It's a "hobby".
Like this one which is an EBC: http://www.i-club.com/forums/attachm...postid=1454322 [Edited by john banks - 3/14/2002 5:26:38 PM] |
John
What's the status of your EBC ? Do you have it up and running yet ? Need a test dummy ? ;) |
I have a loom to which I can attach a working example, but it doesn't use RPM mapping yet. I've been thinking about your WI knock trigger - will post new thread on that :D
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Evo Andy
Thanks for those fuel calcs, that seems to tie up nicely with my actual test results :) One thing I have become more aware of is fuel surge, from 1/3 tank down I'm getting fuel pressure fluctuations (which I have no safety margin for) Time for fuel system mods to fit a surge tank I think. cc |
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