DIY Traction Control

[md4etal]

As a supplier and mfg of Doppler speed radars, be aware that they do not
work at low speed (1-5 mph range) with much reliability.  It has to do with
filtering out low frequency noise.  Also, depending upon signal processing,
they can have a startup delay when moving off of a Dead stop.  I have been
toying with the idea of using one of these as a wheel slip measurement
(already done on agricutural tractors) but only above 5 mph.

Are you in the Rally crowd??

Mike Dekutoski
----- Original Message -----
From: "Axel Rietschin" <axel_rietschin at CompuServe.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, March 12, 2002 3:56 PM
Subject: Re: DIY Traction Control


> > but why would I need deal with
> > the spark timing as well?
>
> On a turbocar you want to retard (not cut) the sparks to avoid slowing
down
> the turbo too much while reducing engine power. At some point you may have
> to make a compromise between reducing slip and keeping the boost up.
Cutting
> too much cycles will kill the boost and turbolag is not exactly your best
> friend in launch and traction control scenarii. A certain amount of
ignition
> retard is a smooth way to reduce power on NA engines. You may want to
begin
> by retarding a few degrees first, then start cutting cylinders as
necessary.
>
> --Axel
>
> 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?
>
>
>
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