02 sensor - temprature compensation.

[Bruce Plecan]

-----Original Message-----
From: Wen Yen Chan <chanwe at ecf.utoronto.ca>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Saturday, March 20, 1999 9:45 AM
Subject: Re: 02 sensor - temprature compensation.


The O2 sensor can catch individual cylinder firings way up in the rpm band,
and trying to isolate all that noise out of it seems like it would be a
whole lot harder then just referencing a temp to current draw of the heater.
With the isolated grounds, it would be much easier...
Bruce

>Just a thought... Why not use a cheaper 1 wire o2 sensor and monitor its
>temperature by measuring the sensor's impedence.
>Wen
>> Subject: 02 sensor - temprature compensation.
>> Need to have a second sensor, independent of O2 for sensing temp.
>> Now if you used a heated O2 sensor and used the resistance of the heater
as
>> an indication of the EG temperature, then your cooking.  Now that gm has
4
>> wire O2s that is something to look at......   830mv, can be 12.5 to
11.3:1
>> depending on EGT.
>> Bruce
>> >Seems like its difficult to accept that a regular o2 sensor is not
accurate
>> >in
>> >rich or lean and high temp conditions.
>> > Making  wide band sensor circuit have stranded 2 times......maybe its
to
>> >time consuming or to difficult?
>> >The wide band sensor is expensive......
>> >What about developing a temp compensating circuit for the LM 3914  based
>> >led meter?
>> >Is this easy?
>> >Maybe a led temp meter with it?
>> >Espen Hilde