WOT or waiting at a Red wrote:
> I've been reading all the post, current and archive, to try to understand
> the PCM in my Dak better. The reason I am interested is I have been
> considering the possibility of using a small PLC (programmable logic
> controller) to interface key sensors to the PCM. Coupled with a simple OI
> (operator interface) you could take the incoming signals, buffer them (read
> change them) and send them on there way to the PCM.
While I do agree with the reasoning behind wanting to do this - I'm not so sure
if a PLC can make it easy to get there. I mostly say this because I am just
ignorant when it comes to PLCs. Don't they just map a set of inputs to a
selectable set of outputs? More importantly, what kind of speeds (of conversion
- or latency from in-to-output) can it achieve? Is this a 2D mapping because
you'll more than likely need at least a 3D-type mapping. If the speed is
adequate, what about after implementing a 3D (or greater) type of kludge - will
the speed still be there?
I personally have been working on a similiar solution - not with a PLC but a
full-blown custom-fabbed micro-based approach (see www.diy-efi.org section on
efi332). My reasoning is that I want TOTAL control.
Don't let me discourage you in any way as I have even heard of people having
success in fuel-injecting motors using not much more than a 555 timer IC...
(don't laugh - remember you can do EFI with only 1 input - TPS - called AlphaN -
I see it at the dragstrip all the time - winning most of the time!).
For a list of all sensors - check my writeup at the following URL:
http://home.netcom.com/~smoseley/DodgePCM.txt
Latr,
Shane
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:59:53 EDT