UEGO IDEA was(Re: More UEGO stuff)

Tue Feb 2 01:54:30 GMT 1999

-----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: Monday, February 01, 1999 7:08 PM
Subject: Re: UEGO IDEA was(Re: More UEGO stuff)

This cal with everything turned off would be the first trick.
The only systems I have a clue about are gm so I speaking specifically about
them.
If your serious about even trying then I suggest you look at a
aussie 808 since it uses the least code, and has room to
write on the existing bin..

Would seem to me, just using a piggy back devise using the EGOR
would be the ticket.  Just use a Stamp/Pic and monitor the O2.
Reverse engineering a prom to disable it is alot of work, and I've
been warned that deleting to much can cause "routine" problems.
One thing I think would work is using a series of 555s for fuel,
and the oem box for timing.
Bruce

>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
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
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>>>>
>>>
>>
>