Throttle pump circuit of analog fuel injection system

This system is part of the summed analog circuits that will become the "brains" of my analog fuel injection system. This part creates a boost/drop in the output relative to a CHANGE in the throttle position (the 1k potentiometer to the left side of the circuit) the bottom left op amp and top left op amp both output voltages relative to the position of the pot wiper, the top amp being inverted but equal to the pot wiper voltage. The bottom op amp outputs to a simple rc circuit that delays the signal slightly and outputs a small signal across the resistor that feeds the capacitor. This output signal from the resistor is buffered through the bottom right op amp and summed with the inverted original signal in the top right op amp, the output of the top right op amp is the voltage across the resistor in the rc circuit which is proportional to the rate of change in the throttle potentiometer. I will try another circuit that puts the resistor on the bottom of the rc circuit that I hope will eliminate the need for inverting and summing the original signal and hopefully reduce if not halve the parts count. The red output of the top right op amp should approximate what a throttle pump does in a carburetted system, keeping the system at stoichiometric ratio when the pressure drops due to throttle usage. I will upload other parts of my AFI system when I manage to work out the details.

published 8 years ago