Sensor Questions?

[FIScot at aol.com]

    Subj:   Re: Sensor Questions?
    Date:   96-01-30 15:17:01 EST
    From:   Wayne.Braun at Develcon.com (Wayne Braun)

 >  O.K.  call me what ever names you would like here ***BUT*** what are
 >  the acronyms BLM and PE supposed to stand for?????

    BLM = Block Learn Memory
    PE = Power Enrichment

 >  Yes I know in this context, CL is Closed Loop and conversly OL would be
 >  Open Loop.

 >  Many people seem to neglect to explain the shortened terms that they
 >  use.  In a lot of cases, no one questions this.  After all, if you do
 >  not even know what "THAT" means well you obviously don't know much at
 >  all.  Well fine, I'll admit it, I don't.  So educate me a little and
 >  explain what you mean.

    Guilty as charged.  BLM is usually a 4x4 matrix that has on one axis
    an RPM component and on the other, a load component.  This matrix is
    updated when the ECM is in closed loop and BLM learn conditions are
    met.  The particular BLM that is used is defined by the particular
    combination of RPM and load.  If the ECM is operating in open loop, the
    ECM can still operate close to the ideal AFR (air/fuel ratio) by using
    the 'learned' value of BLM.

    Seeing as GM does not necessarily use hard and fast rules, the number
    of BLM locations can be as few as 2, to as many as 16 BLM locs.
    (Personal experience cited.)

 >  Unfortunately, this points directly at Mr.  Sealander and I do not mean
 >  to single him out as the only person that does this.  After all, he is
 >  NOT the only person that does this.  I ended up re-reading one
 >  paragraph several times ( in someone elses posting ) before the term
 >  "catcon" fell into place as meaning catalytic converter.

    I guess we all sometimes assume a basic level of understanding that is
    uniform all around.

    [text deleted]

 >  If we could just be a bit more carefull about how we explain things
 >  some of the postings would be a lot clearer.

    I suppose that I could take a little more time.  I forget that everyone
    on the list may not understand all those acronyms.  ;-)  I can't give
    proper credit here, but someone did define a lot of acronyms here on
    the list.  Look in the archives for the info.

 >  Mr.  Sealander, I do enjoy reading the information that you have
 >  provided even if I sometimes have to work to understand them ( that may
 >  not be a bad thing either 8^)).

    Hey, that's good for you!  There is really is no substitute for
    personal effort!

    Scot Sealander FIScot at aol.com (Yeah, I know, someday I'll get a real IP.)