Misc ?? EFI

[Bill the arcstarter]

It was written:
>>     While in PE it stays closed loop but it no longer is in learn 
mode,
>> meaning that the BLM and INT values are no longer being modified, the
>> same thing happens on closed throttle deceleration, it stays in 
closed
>> loop but learn mode turns off.  
>
>On Fri, 20 Nov 1998, Scot Sealander wrote:
>
>> When in PE, the process is open loop, i.e., the feedback device is 
not
>> being used.
>
>I've seen both these conflicting viewpoints expressed before.  To me,
>"closed loop" refers to a control process that is presently using 
feedback
>(like an O2 sensor) to maintain some parameter (like AFR).
>
>It may be just a question of semantics, but I think it is hindering 
some
>of the discussions.  If we can't all be on the same page, knowing what
>individuals mean by their use of "closed loop" may be good enough.

So it sounds like there are two different processes to consider:
1) The processing of the self-learn, ie, adjustment of BLM, INT values
2) The injector fuel delivery is trimmed based on O2 and other sensor 
inputs.

I would nominate the term "Closed-loop" to mean item #2.  Any comments?

Thanks.
-Bill 

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