RE: Modifing pulses and analog signals to the PCM

From: Ronald Wong (ron-wong@home.com)
Date: Thu Mar 01 2001 - 20:45:11 EST


BWAHAHAHA..no wonder your Dak never runs right...."R" stands for reverse,
not "race"! ;-D

Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY

-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of steve preston
Sent: Thursday, March 01, 2001 5:26 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: Modifing pulses and analog signals to the PCM

Between you and Shane,I feel that you guys have this
all about wrapped up! WOW! I thought PLC was a fried
chicken place! Steve P.
--- WOT or waiting at a Red <dakatack@home.com> wrote:
> My intent here to produce an inexpensive tool for
> tweaking the signals from
> the sensors before they are read by the PCM. The
> sensors are themselves not
> mapped, as you know the mapping occurs in a data
> table residing in the PCM.
> I would love to interface with the PCM directly but
> I do not know anything
> about it's communication protocol.
>
> I've considered reading the EPROM's and attempting
> to get some useful data
> in a binary format. On a few projects I've found
> ASCII text in with the data
> that gave me some clues to what the EPROM's data was
> doing.
>
> With regard to speed, I haven't got a clue how fast
> I will need to scan the
> IO but I do have access to the fasted PLCs made. I
> can write code in C++
> and run a multi-tasking mutli-threaded application
> in the PLC and interface
> through high speed IO designed for Data logging.
> This PLC can run up to 256
> PID loops with out affecting scan time. Scan times
> for 1000 lines of code
> are way under 1ms.
>
> Thanks for the link. That will help me get started.
>
> Patrick O'Day
>
>
>
>
> ----- Original Message -----
> From: "Shane Moseley" <smoseley@ix.netcom.com>
> To: <dakota-truck@buffnet.net>
> Sent: Thursday, March 01, 2001 12:00 PM
> Subject: Re: DML: Modifing pulses and analog signals
> to the PCM
>
>
> > 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)
> >
> >
>

=====
Steve Preston 1999 Dakota Sport
3.9V6,4x4,3.92 Anti-spin,42RE auto,Intense Blue,regular cab.



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