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Re: ABS facts and myths

To: DOUG GILL 383-4291 <DGILL@a1.stim.tec.tn.us>
Subject: Re: ABS facts and myths
From: Brian M Kennedy <kennedy@i2.com>
Date: Fri, 05 Mar 1999 22:58:53 -0600
DOUG GILL 383-4291 wrote:
> 
>           >Oh, you wanted me to cite my references!
> 
>           Not exactly! I just asked where can I find this info so I can be so
>           smart like you!  :)
> 
>           >Sorry, I don't keep track of my citations.
> 
>           I just asked where can I find this knowledge that every believes.
>           Sorry, if you are making this personal.

Doug, you are the one who seems to be making this personal.  My comments are 
serious.
I am telling you that I _did_ read it somewhere more official than a chat line,
but then apologizing that I can't give you the hard pointers you are looking 
for.
Like you, I often push to find the authoritative documentation on things.
I had found some in this case, but didn't do a good job of recording it.

>           All the studying of ABS
>           that I have done says the rear brakes are operated together during
>           ABS activation.

That is typical.  But it is also contrary to what the newer ASC / DSC / PSM / 
etc.
systems are trying to accomplish.  Those systems try to control not only tire 
slippage,
but actually yaw and other undesirable car movements.  They will brake single 
rear
wheels to reduce throttle-on oversteer, and un-brake single rear wheels to 
reduce
throttle-off oversteer, etc.  As part of such systems, it is actually easier to 
allow
the ABS to operate independently -- and clearly it is superior.

But again, I'm telling you what I've read -- my apologies that I didn't keep 
good
references.  If you ask on the BMW lists, I suspect someone will know references
and will be able to point you to them.


>           Sorry, I shoudln't have asked an honest
>           question. Contrary to your tone, I would really like some sort of
>           documentation. For me, it's a professional curiosity.

Well, its tough to have a "tone" in Internet mailing lists.  If you're hearing
a tone, you should always ask yourself:  "Could the words I'm reading be read
with a different tone and still make sense?"  If so, be careful the tone you 
assume.

I don't have a problem with your request -- I was simply giving you the best 
info
I had -- and I regret that I cannot give you better.  I usually can.

Sorry if my previous note came off badly,

Brian

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