[Diy_efi] One wire o2 sensor to four wire sensor

[Steven P. Donegan]

A one wire sensor, by electrical requirements can only be narrow band.
Unless some genius comes up with the circuitry that can handle the temps
to make it just nicely do the currently required feedback work
internally :-) Well, even if that were done a wide band requires (again
at this time) a current source - that would likely make the sensor at
least require 3 current paths one of which could be the bung itself...

On Sun, 2007-06-03 at 06:13 -0700, Carter Shore wrote:
> C'mon folks,
> characterizing commercial O2 sensors solely by the
> number of leads is like trying to do the same with
> IC's. (8 pins? gotta be an op-amp, right?)
> 
> What actually matters is what's inside. The number of
> leads will usually be due to some combination of the
> following:
> 
> They are either narrow-band or wide-band.
> They are either heated, or not.
> They have seperate ground wire, or are case grounded.
> They have built in calibration/sensor elements or not.
> 
> etc., etc.
> 
> Carter
> 
> --- Ben Heidorn <b_the_j at hotmail.com> wrote:
> 
> > 2 and 4 wire sensors are resistors that modify
> > signals sent from the ecm, 1 
> > and 3 wire sensors are galvanic batteries that
> > produce thier own signal. 3 
> > and 4 wire sensors are equiped with heaters. you
> > probably wont find the need 
> > for a heated o2 unless you are going to run headers
> > with the sensor mounted 
> > down on the collector. Do a search for posts in the
> > electrical forum of TGO 
> > by b_the_j and you'll see how i ran mine.
> > 
> > 
> 
> 
> 
>        
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