Introduction & O2 Sensor Questions

[James Boughton]

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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.

>My local library has a 1988 version but that may be too old to contain =
a=20
>section on O2 sensors.  I will check it out.

My copy of Heywood is from 1988, also.  I think this is the only edition =
he wrote.

>Can you recommend a source of info on the Nernst equation?

Page 301 in Heywood has the Nernst equation as it applies to oxygen =
sensors.  It may be worth your while to look into the diy_efi book list =
which lists several publications regarding oxygen sensors.  There is =
even an EPA paper listed there that claims the sensor reads H2 and CO =
until it is fully heated (I haven't read this yet).

John Gwynne:  If you have a copy of the aforementioned paper I would =
like to read it also.  I believe it was you who listed the document? =
Yes?:-)

Jim Boughton
boughton at bignet.net




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