Hi everyone,

I have a project where I want to provide some additional fuel to a vehicle
for  improved throttle enrichment. I need some help with a TPS (throttle
position sensor) rate of change (ROC) function.

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. The code
is pretty ugly, a bunch of if..then  statements.

Does anyone have an equation that accumulates   sample differences  of
increasing values or an equation that could be modified for this purpose?

Sampling frequency is  a significant issue.  I guess I probably want to
average a few readings then wait a period of time, then resample. The time
between measurements will greatly affect the rate of change value. If it is
quick, like 10 msec, it will be very difficult to measure because the TPS is
a human activated event. If sample time is long like 1 second, the event is
over before the system can react. I believe that 100 msec between averaged
samples will work.


Does anyone have any strategy ideas?

Thanks in advance

Jon