Quote:
Originally Posted by reid-o
I haven't looked at the link software, but I'm guessing that there is no gain on the knock signal? I'm interested in the knock block now. I'll go look it up. Is the value that its converting the analog to digital for processing as opposed to just applying a threshold to the analog signal?
I've found the same by logging raw knock voltage on the ems 2, and even with the raw voltage amplified to get some readings to pass 1v its difficult to see deltas unless the knock is severe. Actually I don't even know its severe. I just know that I can't make out sharp deltas unless they're really high.
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Knock detection is more than just a voltage threshold on advanced systems.
Knock detection is about the frequency range, the amplitude, the window, detection duration etc etc. Knowing the proper settings for this helps to eliminate false knock detection as well as more precise light knock detection on par with OEM systems. Basic systems like those found in the hydra use a generic logic applied to a simple voltage threshold for overall engine noise.
So with Bariga, it isn't like he's just checking volume. He's been working hard to find the actual frequency that the knock is occurring, while trying to balance that with background valvetrain noise and the duration of the detection window. If this was a hydra, the thresholds would have been set a few hours into the tune and not touched again. (I'm not bagging the Hydra, I'm just using it as a standard that more people are familiar with)