RE: Tire reliabilty, and traction control

["Albaugh, Neil" <albaugh_neil@ti.com>]

Dave;

Just make sure those op amps and comparators are Texas Instruments products!
(adv.) :)

Regards, Neil   Tucson, AZ

-----Original Message-----
From: Dave Dahlgren [mailto:ddahlgren@snet.net]
Sent: Friday, November 30, 2001 4:33 AM
To: rtmack
Cc: Joe Timney; Land-speed List
Subject: Re: Tire reliabilty, and traction control


I am for it but if it runs the throttle or brakes count me out....There are
ways to
control tire spin that do not effect either.. If a guy wanted to build a
simple
traction control all you need to do is this...
measure the wheel speeds front and rear
If the speeds are different by more than a preset amount you can do one of
two things

activate a light that informs the driver he is spinning more than he should
and let
him make the decisions
or
activate a soft rev limiter that will slow the engine down so the tires can
catch
up...

Well Russ you seem to think this will cost a ton of money 5k or more.. I beg
to
differ..
you use one chip to turn the frequency to to a voltage about 1.00 each
you use an op amp to subtract the undriven wheel voltage from the driven
wheel
voltage 0.39
you use a comparator to see if the difference is greater than the set point
uses same
chip you bought for 0.39
you adjust the set point with a trim pot 0.15
you need a little wire and a case to put it in maybe 5.00
oh I forgot the voltage reference a chip about 1.50 and a few resistors and
caps
>1.00
So it is a 10.00 project.... you can use the rev limiter on the msd that is
used for
staging the car.... it is voltage activated..

See cheap and does not fool with the throttle or brakes.. By the way there
may be  a
patent pending on this idea so I would not go into full scale production
this
afternoon.. :>)....
Dave Dahlgren

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