Open/closed loop

[Bob Wooten]

I used Data master to record the runs & the flag did not go out of "closed
loop".  i did notice that teh integrator (& i think BL) are locked @ 128 &
thought how odd.  I am not smart enough to know that this is not "closed
loop".  i am assuming that there are some conditions that have to be met
for the car to be in closed loop & when one or more of them are not met any
more that it ought to go out of that state.  is there a bit that gets set
(or more basically, is there a name for) the period that the "closed loop"
bit is set but the computer is not using the O2 data for determining
Injector on time?  is there another Bit that is set (or not set) that tells
you when the computer comes out of closed loop?  this is considered PE mode
is it not, when the CPU is using the additional data in the other tables
for additional fuel enrichment?

thank you gents.
BW

I am going to re-read the tuning tips & 101 & see if some more of it will
get absorbed.  


> [Original Message]
> From: Bob Valentine <bob at tecmark.com>
> To: <gmecm at diy-efi.org>
> Date: 12/3/00 8:45:04 PM
> Subject: Re: Open/closed loop
>
> What makes you say it doesn't go open loop?
> 
> When mine's (730/$8D) in PE or Highway the scan tool shows "closed loop",
> but closer investigation shows that the Integrator is locked at 128, which
> effectivly is open loop.
> 
> -> Bob Valentine
> -> bob at tecmark.com
> 
> At 07:59 PM 12/3/2000 -0800, you wrote:
> >I just came back from the track today & i am a bit confused.  i thought
> >that when you were past a certain percent TPS (setable via a lookup
table)
> >that the ecm would go into open loop.  i made 6 WO passes & never once
did
> >it go into open loop.  
> >
> >BTW, this is a 7730/$8D ecm.  i don't know what the broadcast code is i
> >have not been able to figure that out yet.  
> >
> >I am going to analyze the data tomorrow, i am pooped.  it is terrible
what
> >the sun does to you.  i bet it was 75 Deg in the stands & probably closer
> >to 80-85 on the track.  you gotta hate those Southern Californians.  
> >
> >thanks Guys, 
> >BW
> >
> >
> >--- Bob Wooten
> >--- r71chevy at earthlink.net
> >--- 71-91 Camaro
> >
> >
>
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--- Bob Wooten
--- r71chevy at earthlink.net
--- 71-91 Camaro


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