UEGO temps

[Chad Clendening]

The UEGO heater controller circuit outputs a constant current UNTIL the preset max voltage is reached.  Then it limits the voltage to
the limit ( 10.5 or so).  This allows it to slowly warm up - without cracking the ceramic.

The constant voltage mode isn't by any means perfect, but sensing resistance of the circuit isn't the easiest thing to do in the
analog world.  With a digital controller, this would be pretty easy.

The control loop on this can be pretty slow, how fast will it really change temp?


Chad

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