Audi: quattro in reverse?

"eBob.com" <com> wrote in message
news:VzbPb.31848$srv.hcvlny.cv.net... 

Yes.
 

Yes.
--
C.R. Krieger
(Been there; done that)

On Tue, 20 Jan 2004 15:12:53 GMT, "eBob.com" <com>
wrote:
 

Is there even such a thing as a uni-directional differential?

daytripper wrote:
 

No, but there are all-wheel drive systems that use electronically
controlled clutches instead of differentials, and I'd imagine that these
might not operate in reverse. It could be that the OP doesn't know or
understand the difference.

--
Mike Smith

"Mike Smith" <DOT.org> wrote in message
news:supernews.com... 
quattro 

Exhaust pipes at the back, and the seat with the round hand-rail faces the
front?

;o)

(Semi-non-facetious bit: like brakes, clutches only operate in one
rotational and one linear dimension. Direction is irrelevant, just the
outcome. A bit like a politician.. ;o)
--

Hairy One Kenobi

Disclaimer: the opinions expressed in this opinion do not necessarily
reflect the opinions of the highly-opinionated person expressing the opinion
in the first place. So there!

Hairy One Kenobi wrote: 

Yes, but that's only *if* the clutch engages. Given that they're
electronically controlled in such systems, the electronics could easily
be programmed not to engage the clutch while in reverse.

--
Mike Smith

"Mike Smith" <DOT.org> wrote in message
news:supernews.com... 

But /why/ would someone do that..? Why would a rational engineer increase
the cost of a product in order to reduce the performance, efficiency and
safety?

It makes no sense.

H1K

Hairy One Kenobi wrote:
 

What makes it cost more to disable the clutch operation? It's all
software anyway. It probably looks something like this (just a
wild-ass-guess example):

if (wheelslip > THRESHOLD)
{
if (speed < CUTOFF)
engage_clutch(MODE_ONE);
else
engage_clutch(MODE_TWO);
}

....uh, or something. If they allowed operation in reverse, they might
very well have to add more code, like this:

if ((wheelslip > THRESHOLD) or (wheelslip < REVERSE_THRESHOLD))
{
if ((speed < CUTOFF) and (speed > REVERSE_CUTOFF))
engage_clutch(MODE_ONE);
else
engage_clutch(MODE_TWO);
}

That's a little bit more code that someone has to write, someone has to
maintain, someone has to test, one more thing to screw up, etc. Maybe
it's just simpler (and better for the bottom line) to disallow operation
of the clutch pack while in reverse gear.

--
Mike Smith

"Mike Smith" <DOT.org> wrote in message
news:supernews.com... 
increase 

You've made my point, but then missed it. How about if you replace the code
with:

<Absolutely nothing>

Which seems even easier to design, code, and maintain ;o)

H1K