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That's it, but instead of governing it to engine speed, here we're governing it to load. The aft side of the cylinder is connected to the vacuum reservoir.
I've let a few folks drive the car (who didn't understand the concept), they only seem to say "it feels like a really big spring on the gas pedal". Makes me wonder if the cylinder is big enough to suit the average driver. By nature they tend to "force" the throttle open into a higher load at low rpm. It really doesn't take a lot of effort to override the cylinder.
Following a gauge alone is mighty tricky, for me at least. Driving cars other than mine now give me a strange feeling, like driving a car with a fixed steering wheel.
The drawings for a full autothrottle are complete, just I've had a challenged initiative to make it real.
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