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Originally Posted by Phast SVX
Wow
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Very succinctly put sir.
He was right about the ballcock, but missed the fact that the feedback from its position was the only 'function of control', whatever that means. There is no attempt to measure and act upon the either the input water pressure or the output water flow.
Similarly with the pendulum, which works solely as a feedback mechanism. Without it, the hands would rotate at a speed related to how tightly the mainspring was wound up. Once again the pendulum is the sole 'function of control'.
Lastly he seems to think that the oven thermostat is an input control sensor, like the MAF, rather than an output measurement sensor, like the O2 sensor!
The oven has no idea of how much energy is being fed in, what the thermal load is inside the oven, or what the external air temperature is, all it knows is the feedback from the internal temperature sensor, and uses that to control the input energy source. The oven has no MAF equivalent, it doesn’t need one!
Finally he mentions the AVC (more properly called AGC) in a domestic radio. Not only does it not act as he said it does; if it did pianissimo sections would be as loud as fortissimo sections, flattening the dynamic range of the music, but also, it doesn’t work as he describes either.
What it actually does is attempt to keep the amplitude of the carrier wave constant so that powerful nearby radio stations are as subjectively as loud as distant weaker radio stations. All of this control is achieved by feeding back the rectified carrier wave voltage, which is extracted before the volume control, to control the gain of the radio-frequency stages. The volume control plays no part in this process at all, and certainly is not ‘the controlling component’. The AGC system is totally unaware of the volume control setting.