O2 sensor duplicator

[Walter Petermann]

Bruce Plecan wrote:
> 
> From: Walter <corsaro at brokersys.com>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Subject: Re: O2 sensor duplicator
> 
> >> Some one (and I lost my note, so sorry list), was working on
> >> a 3 op-amp signal generator for the O2 input for benching
> >> running ecms.  Please contact me!.
> >> Cheers
> >> Bruce
> > What would this circuit have to do, just generate a 0-1
> >volt signal or
> >also react to the change in injector pulse duration and
> >change the o2 reading accordingly ?
> > Walter
> >
> Also react to injector pulse lenght.
> Bruce

Bruce,
 I have been trying to come up with a circuit. I will be
needing one too sooner or later. I also test/repair ecms for
Jaguars, and I'm starting to get into the newer ones (90's)
which will need a little more sophisticated method of
testing the o2 circuit. Up to now, I just measure the
%change from open loop when the o2 is either 0 or 1 volt.
The newer ecms I'm sure will go into 'limp home' mode if I
try to use this same method.
Anyway, what is the range of injector on times for your
application?
What is the highest rate of firing (pulses per second to one
injector) that you use in your tests?

  Walter