There seems to be a few parameters involved, with transducers feeding info to the throttle control, and automatic gearbox.
I have an oldish Saab 900SE. It has a 4-speed auto gearbox.
It amazes me that you just drive into a speed limit area correctly, hit the stalk, and it will stay within 1mph, feet off.
Similarly, in more rural areas, say going up a hill, it decides to go down a gear.
Also it has to know the If I press a pedal, it is over-rided, and switches off,
There is a management system that does all this in a mysterious black box
It must be looking at road speed, revs, pedals, etc.
The senders, or transducers, must therefore by of a different nature, some analogue, as in speed, some digital on/off jobs.
Thank the Gods that it has yet to steer the thing !
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