UEGO IDEA was(Re: More UEGO stuff)

Tue Feb 2 00:01:15 GMT 1999

Not quite Bruce.  Picture the following "Remapping"
procedure...............................

Create a cal which defeats all of the A/F modifiers such as AE, EGR, ECT,
etc.   Also, disable open loop PE enrichment so that the computer stays in
closed loop under all conditions.  Basically, you would now have a VE driven
cal, with closed loop correction capability.   But, instead of "learning"
towards stoich, the system would learn towards a safe setpoint (of say
11.5:1) defined by the electronic gizmo I had proposed.   You could never
map a turbo/supercharged car to stoich, but 11.5 should be safe under most
conditions.

Warm the engine, and verify that it is indeed in closed loop.  Attach the
little gizmo and drive the vehicle.  As you drive, the computer will iterate
towards a set of BLM's.  Stop every once in awhile, and check that you have
covered all of the  BLM cells and  perhaps even massage some of the raw VE
tables in order to help speed up the process.  When you are done, you will
have a VE map of correct "shape", but incorrect "magnitude".

When you are happy with the BLM learning exercise, then you must  shift the
new VE map to reflect stoich rather than the atrificial setpoint.  This is
just a ratiometric number crunching exercise that is easily handled in
something like Exel, or Lotus, with data parsing.

After  the "new" map has been dumped into the cal, restore the A/F modifiers
and PE function, and PRESTO, you would have a pretty good baseline cal that
you can begin to fine tune.  This is similar to the procedure that I use for
remapping my MAP based projects, but that elusive little electronic gizmo
would make my life a lot easier and would eliminate a lot of iterative data
manipulation.

Any thoughts, suggestions, recommendations?   Again,  build a wide band A/F
meter that can emulate a zirconia oxygen sensor, and accommodate a user
setpoint, and much of the world could be at your doorstep.

Walt.

-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, February 01, 1999 6:16 AM
Subject: Re: UEGO IDEA was(Re: More UEGO stuff)

>
>-----Original Message-----
>From: Walter Sherwin <wsherwin at idirect.com>
>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>Date: Sunday, January 31, 1999 9:13 PM
>Subject: UEGO IDEA was(Re: More UEGO stuff)
>
>This idea, just universally raises the entire table.  Seldon is what is
>needed.
>Playing with the coolant temp/MAT, and MAP signals all do the same thing.
>There ain't no short cuts, reprogramming done right, takes time.
>Bruce
>
>
>>Sounds like there is a lot of pent up UEGO talent out there.  Here is an
>>idea for a product that about half of us could really use right now  (I'd
>>buy two if I could find such an animal).   Picture
>>this........................................................you are
working
>>on a GM style MAP based system, that is to be converted to artificial
>>aspiration.  Perhaps it was originally artificially aspirated, or perhaps
>it
>>was not.   Once the basic control "system" is in place, you and I are
still
>>faced with the challenge of remappping the open loop VE tables.
Remapping
>>the VE's can be done labouriously, through data logging, and post hex
>>editing.
>>
>>What about a control box which would take a UEGO signal, and perform an
>>appropriate transform equation, and then export the resultant signal to an
>>output port which one could connect to the O2 sensor pin of an OEM  MAP
>>computer.    The goal would be to make an artificial setpoint (say 11.5:1
>>A/F ratio) appear to the OEM computer as stoich.  If this were possible,
>>then one could use the OEM computer to generate BLM's and iteratively
(read
>>this as safely) reach the perfect "MAP" while driving, or while on a
>chassis
>>dyno.  Imagine, in one afternoon, you could do the work of several days.
>>This would even help the normally aspirated guys.
>>
>>Just food for thought.  If anyone comes up with one of these (or knows
>where
>>I can find one)  then let me know, please.
>>
>>
>>
>>Thanks;
>>Walt.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>-----Original Message-----
>>From: Bruce Plecan <nacelp at bright.net>
>>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>>Date: Saturday, January 30, 1999 9:39 PM
>>Subject: Re: More UEGO stuff
>>
>>
>>>
>>>-----Original Message-----
>>>From: Raymond C Drouillard <cosmic.ray at juno.com>
>>>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>>>Date: Saturday, January 30, 1999 11:39 PM
>>>Subject: Re: More UEGO stuff
>>>
>>>Gee, sounds so easy.  Hmm, care to whip up a ION?.
>>>I certainly hope you weren't making light of Steve's work.
>>>Bruce
>>>
>>>
>>>>I would buy one.  Of course, if I happen to "stumble" across a design
>>>>before the kit is available, I would simply build it myself.  The
>>>>circuitry on a UEGO isn't all that complicated.  In its most basic form,
>>>>it is a single op-amp and a few discretes.  Add a few more components
for
>>>>a double-ended power supply, something to shut off the ion pump when
it's
>>>>not warm, something to regulate the heater, and you have it.
>>>>
>>>>Ray Drouillard
>>>>
>>>>
>>>>On Sat, 30 Jan 1999 14:25:13 -0600 Steve Gorkowski <kb4mxo at mwt.net>
>>>>writes:
>>>>>If one would come as a kit for under $200.00 with sensor. How many
>>>>>would
>>>>>buy the kit ? No sense to design if one if no one was interested in a
>>>>>wide O2 meter.
>>>>>
>>>>>Steve
>>>>>
>>>>>Mike Pitts wrote:
>>>>>
>>>>>> Any interest?  Is this a waste of bandwidth?
>>>>>>
>>>>>> "This invention provides an self-calibrating buffer amplifier
>>>>>> for a Universal Exhaust Gas Oxygen sensor interface circuit
>>>>>> which couples and processes a voltage signal proportional
>>>>>> to pumping cell current to a level and reference voltage suitable
>>>>>> for input to an A-to-D convertor. The goal of this invention is to
>>>>>> increase the accuracy of air-to-fuel ratio control by continually
>>>>>> correcting for the effects of offset quantities in the amplifier
>>>>>> stage necessary to the interface circuitry. This goal is
>>>>>accomplished
>>>>>> by an approach which effectively generates and subtracts these
>>>>>> offset quantities from the processed signal. "
>>>>>>
>>>>>> http://patent.womplex.ibm.com/details?pn=US05211154__
>>>>>>
>>>>>> -Mike
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>___________________________________________________________________
>>>>You don't need to buy Internet access to use free Internet e-mail.
>>>>Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
>>>>or call Juno at (800) 654-JUNO [654-5866]
>>>>
>>>
>>
>