I was doing EFI for my engine. We ve got a inverted signals from engine which make the ECU confused about injection timing. So i need to condition the signal.
Was figuring how to condition a signal generated from magnetic flux, it has a deep valley which is favorable if it is positive.
First we were filtering, trying to cut off the deep valley and make full use about the peaks, but it has two small peaks which is also confusing. We even thought of putting a heavy capacitor to cover off the smaller latter peak.
Thinking from digital aspect, invert it with an Op Amp, then make a square wave using Schmit Trigger. It could be working. However, my prof finally came and come out with another brilliant idea.
We use AC coupling and trigger the transistor switch inversely and thats it, simple, for widely available components with just capacitor, resistors and transistor plus a POT. We made a nice fat signal and it is also squared. What a wonderful analog conditioning.
No comments:
Post a Comment