TPS fuel enrichment strategy. How implement rate of change

[Ward]

On Sat, 18 Sep 1999 21:42:57 EDT, PHXSYS at aol.com wrote:

> I have a project where I want to provide some additional fuel. I need some

> help with a TPS rate of change (ROC) function. 
> 
> How does GM EFI  calculate the rate of change on the TPS? 
> What is the TPS strategy for adding fuel? 
> What conditions activate the TPS fuel enrichment?
> 
> I have written some code reads the TPS in a timing loop. it accumulates
the 
> difference between increasing values, the result is  a 0-255 value. 
> 
> Does anyone know what  GM's TPS sample rate is for  calculating ROC?
> 
> My main concern is the timing of the whole procedure. If I detect rapid 
> throttle advance, can I ...?
> 
> 1. Add a percentange of fuel  (calculation directly proportional rate of 
> change value)
> 2. Engage a sustain period also based on TPS rate of change (ROC) value
> 
> ...without re-sampling the TPS ROC value during the enrichment period.
This 
> means that the TPS would not be sampled again until the sustain period is

> finished. 
> I am trying to keep it simple.
> 
> Can you see any serious problems with this strategy?
> 
> Thanks in advance

Not shure what you have, but most of these system update at 12.5 msec. The
outputs are then lag filtered. 

There is a lot of variation between "GM" systems, so generalizations are
very iffy.

Ward




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