O2 sensor duplicator

Bruce Plecan nacelp at bright.net
Sun May 10 12:54:30 GMT 1998


-----Original Message-----
From: Walter Petermann <corsaro at brokersys.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, May 10, 1998 4:52 AM
Subject: Re: O2 sensor duplicator


>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
>>
>> >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
>
Well I've been told on the TBI it should be 1-5 msec., and on
the TPI 2-10 msec.  One the TBI rate of fire would be 240/
sec, and TPI 120/sec.
   But, I'm still gathering parts to actually be able to fire one
up.
   If ya haveta have a more exact answer I quess I could
mock something up.  I was just "planning" on doing one real
nice set-up.
  If anyone has more accurate numbers, PLEASE say something.
Cheers
Bruce




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