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DucatiKiller
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How does an automatic gearbox know when to change gear?

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?

How does an automatic gearbox know when to change gear

As the title suggests, how does an automatic gearbox know when to change gear, for example, how does the autobox know to shift down when you hit a gradient for example, also how does it know to shift up at 2000 rpm when driving gently, but when driving 'enthusiastically' how does it know to hold until the redline ??

On a modern vehicle I guess this will be computer controlled, so in addition to the above, how did the older vehicles pre-computer controlled do it.

How does an automatic gearbox know when to change gear?

As the title suggests, how does an automatic gearbox know when to change gear?

For example, how does the autobox know to shift down when you hit a gradient? How does it know to shift up at 2000 rpm when driving gently? When driving 'enthusiastically' how does it know to hold the shift until redline?

On a modern vehicle this will be computer controlled. In addition to the above, how did older analogue transmissions accomplish this before computer controls?

Tweeted twitter.com/#!/StackMechanics/status/166845564128985088
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How does an automatic gearbox know when to change gear

As the title suggests, how does an automatic gearbox know when to change gear, for example, how does the autobox know to shift down when you hit a gradient for example, also how does it know to shift up at 2000 rpm when driving gently, but when driving 'enthusiastically' how does it know to hold until the redline ??

On a modern vehicle I guess this will be computer controlled, so in addition to the above, how did the older vehicles pre-computer controlled do it.