As the title suggests, how does an automatic gearbox know when to change gear, for?
For example, how does the autobox know to shift down when you hit a gradient for example, also how? How does it know to shift up at 2000 rpm when driving gently, but when? When driving 'enthusiastically' how does it know to hold until the shift until redline ??
On a modern vehicle I guess this will be computer controlled, so in. In addition to the above, how did the older vehicles pre-computer controlled do it.analogue transmissions accomplish this before computer controls?