[Gmecm] Re: BLM cell confusion
William Lucke
william.lucke
Sat Dec 10 14:42:43 UTC 2005
Any further thought on the two cell BLM issue?
What about the $6D mask that was used previous to the $a1 in 2.8 and 3.1 V6
apps? Does it have 2 cells or 16?
IOW, which one is the "best" code base from which to start? Or should I use
$8F and rescale the tables to 1 bar?
Will
>From: "WopOnTour" <wopontour at hotmail.com>
>Subject: Re: [Gmecm] BLM cell confusion
>
>Wow
>That just blows me away
>I gotta take a closer look at that $1A calibration as it appears to break
>all the rules that I thought I had somewhat straight in my head going back
>over 20 years now.
>Thanks for your insights
>Regards
>WopOnTour
>
>----- Original Message -----
>From: "Ryan Hess" <rgmecm at yahoo.com>
>To: <gmecm at diy-efi.org>
>Sent: Sunday, November 13, 2005 5:12 PM
>Subject: Re: [Gmecm] BLM cell confusion
>
>
> > Well according to Steve's previous post, it doesn't
> > increment linearly, but rather is like a
> > teeter-totter... The "plank" itself is always moving
> > to the rich or lean (like the integrator trying to
> > keep the engine stoich), and the pivot is moving to
> > bring everything into a long term balance (the BLM to
> > 128)
> >
> > It seems as though the increment of the BLM by one as
> > the INT hits it's limits is common in most other
> > applications (as you've seen with the 16 BLM cells),
> > but I have to say that the $a1 is different. It's
> > always trying to keep the int at 128 +/-4 (the INT
> > "action" window). It also appears that the INT takes
> > a much larger portion of the fueling equation.
> >
> > That's how I observe it, anyways...
> >
> > --- WopOnTour <wopontour at hotmail.com> wrote:
> >
> >> Well first you need to operate it so it's IN cell 2
> >> (In gear with some RPM
> >> above idle??)
> >> In any cell, as integrator climbs small amounts of
> >> injector pulse
> >> width/delivery (bpw x 1.001?) are occurring. When
> >> integrator hits it's high
> >> clamp point (eg 138) it will increment BLM +1 and
> >> reset integrator to 128.
> >> This would result in an increase from the base
> >> delivered fuel or base pulse
> >> width x 1.01 This cycle will continue if the O2
> >> feedback continues to show
> >> leaner than stoich. So in your example if BLM in any
> >> cell achieved 128+5
> >> (133) when it finally achieved a stoich ratio this
> >> would equate (depending
> >> on calibration) to say bpw x 1.05 This value will
> >> then remain "stored" in
> >> this cell so that next time the vehicle is at the
> >> same load (same cell) it
> >> will commence immediately with a 1.05 factor. Of
> >> course the opposite occurs
> >> if O2 feedback is indicating RICHER than stoich.
> >> Well that's the way I understand it anyway
> >> Hope it helps
> >> WopOnTour
> >>
> >> ----- Original Message -----
> >> From: "Ryan Hess" <rgmecm at yahoo.com>
> >> To: <gmecm at diy-efi.org>
> >> Sent: Sunday, November 13, 2005 10:52 AM
> >> Subject: Re: [Gmecm] BLM cell confusion
> >>
> >>
> >> > Any other ideas about getting cell 2 to learn?
> >> I'm
> >> > really stumped here.
> >> >
> >> > Or - maybe you can explain the relationship
> >> between
> >> > INT and BLM? I think I read somewhere that one
> >> INT
> >> > step is 1/2 a BLM step? So could I say an INT of
> >> 138
> >> > would correspond to the current BLM + 5?
> >> >
> >> > Ryan
> >> >
> >> >
> >> > --- Ryan Hess <rgmecm at yahoo.com> wrote:
> >> >
> >> >> That helps immensely, Gary, thanks!
> >> >>
> >> >> Since all the other conditions are being met,
> >> I'll
> >> >> just have to assume it's my BPW that isn't above
> >> >> 1.08.
> >> >> It's hard to tell when the ALDL data only puts
> >> out
> >> >> integers...
> >> >>
> >> >> But in starting to tune the main VE table, I
> >> guess I
> >> >> would want cell 2 'learn enabled' while I hold
> >> the
> >> >> engine at some specified RPM, and "anchor" the VE
> >> >> table at that point with a BLM of 128 by changing
> >> >> the
> >> >> BPC vs EGR constant, then go open loop and start
> >> >> tuning the VE via wideband.
> >> >>
> >> >> I guess the problem is in enabling block learn.
> >> The
> >> >> BPW you mentioned of 1.08 is in the low
> >> hysteresis
> >> >> constant... I don't understand hysteresis to
> >> begin
> >> >> with, but I assume if I changed it to 0.7, I
> >> would
> >> >> want to change the high hysteresis value to
> >> around
> >> >> 1...
> >> >>
> >> >> Ryan
> >> >>
> >> >>
> >> >> --- Gary Evans <gary at garyandliz.com> wrote:
> >> >>
> >> >> > The $A1 code uses 3 BLM cells:
> >> >> >
> >> >> > Cell 0 = idle
> >> >> > Cell 1 = part-throttle
> >> >> > Cell 2 = "overrun" aka no load
> >> >> >
> >> >> > As you have discovered, cell 2 is entered on
> >> the
> >> >> > conditions of high
> >> >> > (ish) RPM and low map, such as coasting with
> >> the
> >> >> > throttle closed. I'm
> >> >> > not sure what the point of the cell is other
> >> than
> >> >> > for emissions
> >> >> > purposes.
> >> >> >
> >> >> > From the ARUR bin, the vales required to enter
> >> >> Cell
> >> >> > 2 are:
> >> >> >
> >> >> > Map less than 32 kPa
> >> >> > BPW less than 1.95 mSec
> >> >> >
> >> >> > There are also a number of conditions that must
> >> be
> >> >> > met for block
> >> >> > learn to be enabled. MAP, BPW and RPM must all
> >> be
> >> >> in
> >> >> > a certain range.
> >> >> > For the ARUR bin, the conditions are:
> >> >> >
> >> >> > Closed loop conditions met (Coolant temp up,
> >> >> engine
> >> >> > run time met, no
> >> >> > fault codes, o2 sensor ready)
> >> >> > Charcoal canister not purging.
> >> >> > RPM between 400 and 6375
> >> >> > MAP above 22 kPa
> >> >> > BPW above 1.08
> >> >> >
> >> >> > If you are just revving the car in neutral, it
> >> is
> >> >> > likely that one of
> >> >> > the conditions is not being met. The time it
> >> takes
> >> >> > for the BLM to
> >> >> > update is also dependent on how far the INT is
> >> >> from
> >> >> > 128. The table
> >> >> > looks like this:
> >> >> >
> >> >> > ###########################################
> >> >> > # F58 TABLE #
> >> >> > # BLOCK LEARN DELAY TIME INTERVAL #
> >> >> > # VS. DELTA BETWEEN INT AND 128 #
> >> >> > # TABLE VALUE = SEC*20 #
> >> >> > ###########################################
> >> >> > 8997 52 82 F58A 4.1 SEC
> >> >>
> >> >> > 0 INT-DELTA
> >> >> > 8998 4C 76 3.8 SEC
> >> >>
> >> >> > 2
> >> >> > 8999 3C 60 3 SEC
> >> >>
> >> >> > 4
> >> >> > 899A 32 50 2.5 SEC
> >> >>
> >> >> > 6
> >> >> > 899B 2C 44 2.2 SEC
> >> >>
> >> >> > 8
> >> >> > 899C 28 40 2 SEC
> >> >> > 10
> >> >> > 899D 24 36 1.8 SEC
> >> >> > 12
> >> >> > 899E 20 32 1.6 SEC
> >> >> > 14
> >> >> > 899F 1C 28 1.4 SEC
> >> >> > 16
> >> >> > 89A0 18 24 1.2 SEC
> >> >> > 18
> >> >> > 89A1 14 20 1 SEC
> >> >> > 20
> >> >> > 89A2 14 20 1 SEC
> >> >> > 22
> >> >> > 89A3 14 20 1 SEC
> >> >> > 24
> >> >> > 89A4 14 20 1 SEC
> >> >> > 26
> >> >> > 89A5 14 20 1 SEC
> >> >> > 28
> >> >> > 89A6 14 20 1 SEC
> >> >> > 30
> >> >> > 89A7 14 20 1 SEC
> >> >> > 32
> >> >> >
> >> >> > So, a delta of 4 (INT at 124, for example) will
> >> >> not
> >> >> > start to move the
> >> >> > BLM for at least 3 seconds.
> >> >> >
> >> >> > Each calibration will be a little different,
> >> but
> >> >> > that is the gist of
> >> >> > it. With so few cells, the BLMs will naturally
> >> >> vary
> >> >> > with driving
> >> >> > conditions. If it varies a lot then there is
> >> room
> >>
> > === message truncated ===
> >
> >
> >
> >
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> >
>
>
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>End of Gmecm Digest, Vol 9, Issue 9
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