excelerator pump

[Clive Apps Techno-Logicals 416 510 0020]

> 
> can someone come up with a circuit that will take the output from the
> throttle position sensor (0-5v), and sense when it has been suddenly opened?
> 
> ie. if you open the throttle suddenly the output goes high...

use a comparator
put the output of the TPS on 1 sense
put the output of the TPS on the other sense with a capacitor that charges up

put diodes in both lines at the TPS to isolate them
out a small resistor as a pull down on the cap

when you tromp it the capacitor will take a while to charge up
while there is a difference the output can be configured to be either
logical 1/0 or a proportional value related to the difference which can be used
to control the amount of enrichment
adjusting the capacitor size can control the amout of time that the enrichment
is active
additionally it can take a little time time to charge adding a starting
enrichment for a brief time period

adjusting the resistor can be used to control a decel enleanment circuit
by allowing a -ve compare output sense while the cap discharges

simple but elegant

Clive