WPSLPGExhaust Gas Oxygen (EGO) sensor Information

[rr]

Maybe I shouldn't have butt'd in, however I know as fact that the
proportional term is used to keep the reading of the O2 sensor
crossing stoich. That is the way the code works.

The proportional term is always applied in the opposite direction
of the O2 sensor reading. If rich, the prop term reduces bpw, if
the O2 is reading lean, the prop term increases bpw.

Yes, in the end, the BLM is adjusted from the prop term through
the INT to the BLM.

As for the derivative term, there are resets of both the prop term
and int term that occur. On the other hand, the PID loop is slow
enough where no derivitive term is required.

BobR.

Greg Hermann wrote:

> With regard to last night's little flap about PID control, bang-bang
> control, etc.:
>
> I believe that a bit more investigation would show those concerned that the
> INT term, and the other one mentioned have a bit more to do with adjusting
> the block learns than with cycling the mixture across stoich.
>
> As for the "little people" on this list, they all live at CSH-HQ, so far as
> I know!
>
> Ain't any insecurity in saying to learn to walk before you try to run--as
> in learn to read plugs before trying to use a sensor (an EGO or a HEGO) for
> a purpose for which it will not work in anything resembling a useful
> manner. A WBO2 is another story, but still no substitute for reading plugs.
>
> Greg
>

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