Re: italian-cars-digest V7 #45

[Abarth750@domain.elided]

In a message dated 98-02-09 17:32:05 EST, you write:

<< Despite differences in mounting and heated/unheated configuration, all   
 O2 sensors are basically the same.  The oxygen sensor is a wonderful   
 thing, but it has an almost purely "on-off" output.  That is, it can tell   
 the computer "too lean" or "too rich", but it can't say "just right".  So   
 you get 0.1 V at "lean" OR 0.9 V at "rich" (or is it vice versa?), but   
 never, say, 0.45 V ("just right").
 
   It actually works the same way as the thermostat in your house - the   
 furnace can only be either "on" or "off", but the thermostat can still   
 control the temperature in the room by deciding when "on" and "off"   
 occur. >>

Close but not exactly. the O2 sensor is not on off pattern but a sin wave
pattern.The trick is to reduce the amplitude of the sin wave in order to stop
the constant rise in fall.