Cruise control and downhill
#1
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Cruise control and downhill
I was driving this morning and found myself wondering why the car doesn't keep a constant speed with the cruise control on while going downhill.
I can see how it might not work on a 6MT, but in an automatic, the transmission will automatically downshift if you're braking on the way down a hill and the brakes can obviously be automatically controlled since they are by VSA. Thus, why couldn't a combination of engine braking and brakes be used to automatically keep the speed steady when going downhill?
I figure that it's technically possible, but isn't done for some safety reason. Any thoughts?
I can see how it might not work on a 6MT, but in an automatic, the transmission will automatically downshift if you're braking on the way down a hill and the brakes can obviously be automatically controlled since they are by VSA. Thus, why couldn't a combination of engine braking and brakes be used to automatically keep the speed steady when going downhill?
I figure that it's technically possible, but isn't done for some safety reason. Any thoughts?
#2
Three Wheelin'
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its not good to ride ure brakes going downhills, theyll heat up.
n most of the hills here the car keeps the same speed i beleive, annoys me tho cuz i want that momentum to keep me going rather than push it away. then again florida hills are not even hills =/
n most of the hills here the car keeps the same speed i beleive, annoys me tho cuz i want that momentum to keep me going rather than push it away. then again florida hills are not even hills =/
#4
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Originally Posted by drewba
I was driving this morning and found myself wondering why the car doesn't keep a constant speed with the cruise control on while going downhill.
I can see how it might not work on a 6MT, but in an automatic, the transmission will automatically downshift if you're braking on the way down a hill and the brakes can obviously be automatically controlled since they are by VSA. Thus, why couldn't a combination of engine braking and brakes be used to automatically keep the speed steady when going downhill?
I figure that it's technically possible, but isn't done for some safety reason. Any thoughts?
I can see how it might not work on a 6MT, but in an automatic, the transmission will automatically downshift if you're braking on the way down a hill and the brakes can obviously be automatically controlled since they are by VSA. Thus, why couldn't a combination of engine braking and brakes be used to automatically keep the speed steady when going downhill?
I figure that it's technically possible, but isn't done for some safety reason. Any thoughts?
We 6MT folks have to do that ourselves.
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#5
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Originally Posted by moda_way
I'm sure as soon as adaptive cruise systems get approved here, we'll see it, as for now, the compression of the engine is all that we get.
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#6
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Originally Posted by TSX.Fury
My father has adaptive cruise control in his new A8
So I think its already here :wink:
![Dunno](https://acurazine.com/forums/images/smilies/dunno.gif)
Thanks!!!
#7
Race Director
Originally Posted by TSX.Fury
My father has adaptive cruise control in his new A8
So I think its already here :wink:
![Dunno](https://acurazine.com/forums/images/smilies/dunno.gif)
Like all other technologies it will trickle down soon enough.
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#8
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Originally Posted by biker
You can get it as an option even in the relatively cheap IS350.
Like all other technologies it will trickle down soon enough.
Like all other technologies it will trickle down soon enough.
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