O2 sensor response times- catalyst

[Bernd Felsche]

Will McGonegal writes:

>Just for anyone interested, in the NTK wide ratio sensor manual it
>states that the O2 "pump" current varies from -12.5 to 12.5 mA, the O2
>sensor is biased with a 25 uA +/- 3 uA current (the sensor output
>voltage (450 mV for stoich) is read on top of that).  The heater
>voltage is 10.5  +/- 0.5 volts.  I still don't know how you go from
>pump current to AFR!

This is derived from the new Bosch SI Engine Management book:

The -25 mA would correspond to approx lambda of 0.7, +25 mA to
approx 2.2. 0 mA is lambda = 1.

You should be able to fit a curve through those three points.

Not that it's not often useful to have a lambda of 0.7 - that's way
more rich than any steady-state running would require.

-- 
Real Name: Bernd Felsche
    Email: nospam.bernie at perth.DIALix.com.au
     http://www.perth.dialix.com.au/~bernie - Private HP
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