Introduction & O2 Sensor Questions

[Tom Cloud]

Jim, you're sending those undecipherable attachments with
your e-mail (see bottom)

        8^)

>Neil wrote:
>>I wonder if an O2 sensor with an integrated heater would help?
>
>I don't think the heater will control to a constant temperature.  The OEMs use the heater to allow them to go closed loop faster on the Federal Test Procedure (FTP) tests which reduces emissions.  Without a heater the controller must wait for exhaust gases to heat the zirconia element to its operating temperature which is too far into the test for them.

you'd need some feedback -- a thermistor or such and then a
control circuit for the heater.  If the mfgrs would use a PTC
thermistor (probably can't make one that'd stand the heat)
or use a ferrite's Curie point a-la the Weller soldering iron
temperature control elements -- but now we're just wishing.

  [ snip ]

>Jim Boughton
>boughton at bignet.net
>
>
>Attachment Converted: C:\UTCONN\EUDORA\ATTACHMENTS\REIntrod
>

Tom Cloud <cloud at peaches.ph.utexas.edu>