Subject:
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Re: automatic transmission
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 4 Feb 2004 09:08:47 GMT
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Viewed:
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1710 times
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phoenix@online.no (Øyvind Steinnes) wrote in <HsIMzr.19KB@lugnet.com>:
> But today I was reading the local newspaper and read about a new type of
> Automatic (or semiautomatic) transmission for cars. Its called DSG.
> Anybody heard about it? It is been used in Audi TT and Volkswagen Golf,
> VW Tuareg or some other models of the Audi/VW company. It is not really
> a utomatic transmission but works as one. There are two clutches
> involved, the first clutch handles gear 1, 3 and 5 and the second takes
> gear 2, 4 and 6. When you start in the first gear, and acellerate the
> computer will automaticly put in the next gear and transfer with the
> clutch when needed. This allows about 0.02sek between each gear.
This page:
<http://news.kak.net/modules.php?file=article&name=news&op=modload&sid=488>
contains two drawings of the DSG box.
Mechanically, it should be possible to build it: make two three-speed boxes
(driven by the engine at different speeds), and use clutch gears to connect
the outputs from the boxes.
Controlling it automatically will be more difficult: deciding which gear to
preselect depends on things like accelleration. I don't know if you can
measure accelleration with an RCX, and even if you can, the model will be
driving at a constant speed for most of the time (so there's no useful
data).
Maybe a simpler algorithm will work better:
- as long as the engine is on, keep preselecting higher gears
- when the engine is off, preselect a lower gear (or put the box into first
gear right away).
--
Harro de Jong
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Message is in Reply To:
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