Changing output of WB O2 setup (Autronic)

[Jörgen Karlsson]

Hi,

The curve is not linear, that is required by autronics autotune feature.

It is ok from 10-14AFR, where 10:1AFR=1.46v and 14:1AFR=2.53v.
But 15:1AFR=2.63v and 20:1AFR=2.97v.

It should be pretty easy to convert the 10-14AFR range to a suitable signal.
10:1 must be 0v and 14:1 must be 0.47v. Then you can run autotune in that
range, if you want a leaner mixture you make the change in the open loop
table after you have run autotune.

But I think that it is pretty simple create a linear voltage signal from the
serial ouput, the serial stream used to communicate with a pc is simple
text. The display cannot be used together with a laptop because the protocol
is different, maybe it is simpler to convert this with a microcontroller.

Jörgen Karlsson
Gothenburg, Sweden.


> JK, could you elaborate a little more on this? Do you really mean the
> "curve" itself (it's shape or something else?), *or* the fact that it
> occupies 1-4V instead of 0-5v? I have teetered on the verge of buying one
> of the FJO's, and would appreciate any feedback you have. Also, I recall
> at least one other person on the list who was already using an FJO unit.
> If I remember, that bloak's feedback was fairly positive. Tnx.

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