ECU pulse width calculations

[G. Scott Ponton]

<unlurk>
    There is a lot of good information in the archives about how the OEM
systems use the o2 sensor. As the OEMs implement it it is used more as a
switch than anything else. This has been an ongoing disagreement for some of
us. The O2 sensor is capable of being used as an analog device if it is not
connected to the OEM computer system.
    The problem with it is that it has a very narrow operating window. It
won't read AFRs much either side of stoich. So using it in a manner other
than it was intended by the OEM system isn't necessarily going to give you
the info you always want.

<relurk>
Scott