more 747 questions

[Bruce Plecan]

From: steve ravet <steve at sun4c409.imes.com>
Subject: Re: more 747 questions


>> Your looking at two different tables, one is an enrichment (a fuel
>> VE addition), and the other a final air fuel ratio.  The 0487-048E
>> would be expressed after the conversion as something like 12.5:1,
>> the other as a percent.  The percentage is added as PE is enabled.
>
>But, at WOT you are open loop, right?

Open loop just means it's not looking at the O2 voltage at that moment.
There are still BL corrections applied, coolant temp
corrections applied.  The Injectors have to have enough capacity for
accleration modes.  So control of WOT AFR is nececessary,
and the fuel reguirements may or maynot be linear.

 so why do you need an A/F table
>at WOT, since you aren't trying to maintain a particular A/F ratio?

See above, and yes you are trying to maintain a specific AFR.  Also
the 00 is a way to turn off the power at high rpm.

>Keep talking about it and I'll figure it out.
>
>> Bruce      If this still isn't clear to any one, let me know and I'll try
to
>>                 splain it betters.
>Ok, you asked for it.
>--steve
>
Bruce