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rickair7777 is absolutely correct, and in software engineering and control systems, its referred to as a closed-loop system.Originally Posted by rickair7777
The computer would have AHRS data, which would most likely include inertial velocity data. I suspect the computer would flag a discrepancy between IAS and inertial velocity data (or GPS speed-over-ground). Or it would recognize a "reality mismatch" between very low IAS and other flight data parameters. Not smart enough to solve the problem, but smart enough to know there is one. Well, same could be said for the pilots.
Basically once the plane "decides" to go nose-up to slow down, it also expects to see a decrease in speed. (A complex model, a lot like a flight-simulator, would model the amount of nose-up and effect on airspeed).
If the predicted and measured values are close, within some tolerance, then its fine. But if the scenario happens where the exact opposite happens (more nose-angle results in more airspeed), it is trivial for the computer to recognize that the model and measured data are diverging, and getting further and further apart.
It cannot correct for that, but it can certainly alert human-crew to conflicting data.
The closed loop is basically, "Predict what will happen. Do something, and observe the results. See if the prediction matches the results. Adjust parameters, and repeat the cycle for desired effect".