EGO heater as temp sensor

[Robert Harris]

Dr Bruce has been inquiring about using the high positive temperature
resistance of the heater as a sensor.

Looking at my Heywood shows there is a very significant change in the output
of the sensor with the change in the sensor temperature.  The higher the
temperature, the lower the output voltage. This is over a range of at least
200mv.   The stoic switch over can take place anywhere from 650mv to  875mv
depending on temperature.  

One consequence of this is the cooler the sensor, the leaner the mixture for
any temperature over stoic crossover.  

Bob Hale has pointed out that the heater resistance increases rapidly with
temperature.  

Questions 

Does the O2 output vary by the heat of the gas or by the heat of the sensor?

By gas - can the heater be used to measure the temperature of the gas by
switching it over to measuring resistance when the sensor is warmed up?

By sensor - would a current regulator circuit be useful to keep the sensor at
a constant known temperature after warmup.

Inquiring minds want to know.  Thanks in advance

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