More UEGO stuff)

[Raymond C Drouillard]

Going one step beyond that:

You can replace the regular HEGO sensor with a UEGO sensor that has
additional circuitry that allows any mixture to be seen as stoich by the
stock computer.  It can be made to see 11.5:1 (to use your example) as
stoich at WOT, and around 16:1 as stoich during light throttle cruise. 
There were a few of us toying with that idea a few months ago.  The
circuitry to do that would be fairly simple.  Simply feed the UEGO signal
and an appropriate DC level into a adder, then amplify it to get the
desired slope.

Ray Drouillard


On Sun, 31 Jan 1999 21:02:39 -0800 "Walter Sherwin"
<wsherwin at idirect.com> writes:
>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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>>
>
>

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