fuzzy logic controllers

[Clare Snyder]

Christopher Bruno wrote:
> 
> jb24 at chrysler.com wrote:
> >
> > >>In a similar vein, are "learning" or "self tuning" controllers
> > currently found in commercial automotive systems?
> >
> > Thanks for any help,
> > Jay<<
> >
> > Another consideration for lookup tables is failure modes.  Suppose you
> > lose a sensor, or many sensors to age or leaded fuel and so on.  The
> > so-called 'limp-home' modes will operate with few operating sensors, do
> > to a row in the lookup matrix for zero voltage or the like.  I'm not
> > sure what it is but my truck will light the check engine light after
> > hitting a few inches of water, cough and stumble for a little bit
> > (maybe ingestion, but hard to imagine on a 4x4) and continue on, then
> > find its breath again and the light goes out.  Any comments?
> >
> > John Bucknell is jb24 at chrysler.com
> 
> I've thought about this because I've heard many stories about these
> cars that have intakes WAY above the ground and then they die when
> they drive through a puddle only a few inches deep.  I wonder if it
> has something to do with the Oxygen sensors on the exaust.  Some of
> the O2 sensors are not heated and perhaps the splash of water on the
> exhaust/sensor cools it to below the 600 degrees it needs to be
> operating at and suddenly the car receives bogus data from the O2
> sensor.  Even if the sensor were heated the heater may not be able to
> react quickly enough to this kind of rapid heat loss.  Any comments?
> 
> --
> Christopher Bruno
> Teradyne
> 321 Harrison Ave. MS/H63
> Boston, MA 02118
> 617.422.2040 Office
> 617.422.2304 Fax
> bruno at icd.teradyne.com
On most engines you could pull the O2 sensor right off, and it would
keep running, even if it did not "learn" or "adjust" as the O2 sensor is
only used for fine tuning.
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