UEGO IDEA was(Re: More UEGO stuff)

Tue Feb 2 03:35:46 GMT 1999

Curious...........how do you "Remap" a GM MAP based system at CSH Central?

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 6:33 PM
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: 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
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>___________________________________________________________________
>>>>>>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]
>>>>>>
>>>>>
>>>>
>>>
>>
>