How are cruise control process parameters measured?
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 !
