NTK UEGO response

[Gar Willis]

On Sun, 23 May 1999 09:36:33 -0400, "C. Brooks" <cbrooks1 at tqci.net> wrote:

>There is now a file on the FTP site called NTK_UEGO.JPG
>
>It is the UEGO controller output as a function of A/F ratio for the model#
>TC-6110A.
>
>There are three control boxes available from NGK
>
>TC-6110A Lean/Rich measurement for A/F ratios between 10:1 and 30:1
>TC-6110C Lean measurement for A/F ratios between 14:1 and 55:1
>TC-6110D Rich measurement for A/F ratios between 10:1 and 15:1

What you see there is a curve that has remained the same since the TC-6000.

Also, everybody should understand that's NOT a voltage out curve of the sensor,
of course, since it's a current-pump device, but rather the result of the
equivalent R of the current-pump's feedback circuit in the NTK interface box,
multiplied times the Ipump. The two roughly linear slopes on either side of
stoich (this point of zero pump current is set in the NTK boxes to fall on 3.0V
out) represent the cases of the pump having to add or extract O2 from the
measurement cavity, and since it takes a diff. amount of current per amount of
O2 to pump, depending on whether you're removing or adding O2, you get those two
diff. slopes on either side of stoich.

Just wanna emphasize that these output curves and model #s Charles has post are
for a complete NTK interface box/system, not sensors per se. Thas why he said
"UEGO *controller*" output in his post.

Gar

P.S. The *shape* of these curves is just like EGOR-the-module's output (because
the shape is inherent to the sensor), although the output voltage range and
stoichpoint can be altered as you wish. EGOR-the-meter will have linearized
them, and allow programming the range of AFR inspection and output voltage, as
well as the crossover voltage for stoich. Hadta get that lil advert in, ya know.
B)