Op amping the O2 sensor

[Clare Snyder]

Boucher, Joe C wrote:
> 
> We have discussed altering the sensor signals to the ECU the last couple
> of days.  I'm disappointed no has mentioned the O2 sensor.  I understand
> the slope of current sensors response around stoichiometric is very
> steep.  The way GM ecu's handle this is to cycle the air/fuel ratio back
> and forth through stoichiometric.
> 
> My thought is if you could change the output of the sensor, it would
> change the mixture lean or rich.  An op amp with a variable resistor
> could swing the signal a small amount richer or leaner as required.
> EXCEPT, from my readings about op amps, there is a frequency limit where
> the amplification falls off.  (HE CAN BE TAUGHT!)
> 
> The question of the post:  Is the frequency of the GM ECU swinging of
> the mixture back and forth through stoichiometric beyond the frequency
> limit of op amps?
> 
> Joe Boucher
If it is, the opp amp is a snail!!! You can watch the needle swing from
rich to lean and back on an EGA, as it follows the O2 sensor.
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