DIY Traction Control

Brian Dessent brian at dessent.net
Thu Mar 21 08:24:13 GMT 2002


Axel Rietschin wrote:
 
> PS: I'm looking for a device having four wheel speed inputs and one output.
> I'd like to be able to choose what I want as output, for example the avg
> wheel speed, fastest wheel, slowest wheel, or the median speed, ignoring the
> fastest and slowest and averaging the remaining two. The idea is to do 4wd
> traction control with a 2wd TC system, using the output of this device as
> "driven" wheel speed and a non-contact speed sensor (a Doppler effect ground
> speed radar) as "undriven" wheel speed.
> 
> Any idea?

National's LM2907 can do select-low, select-high, and select-average of
two wheel speed inputs.  See page 16 of the datasheet for sample
circuits.

http://www.national.com/ds/LM/LM2907.pdf

Brian

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