IGNITION PROJECT

Fri Oct 11 21:52:14 GMT 1996

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Sounds like a very good idea to me.
It would be interesting along the way to have your wish list, as it is =
your project at the beginning, to see if we can integrate them into what =
it grows into.

As to digitising, if you have access to a good camera, photo CD is a =
'cheap' one off way of doing it, but look at the prints before having =
the negs put on disk.

Mark

----------
From: 	jac at wave.sheridan.wy.us[SMTP:jac at wave.sheridan.wy.us]
Sent: 	Friday, October 11, 1996 3:30 PM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	RE: IGNITION PROJECT=20

Mark,

I have this project up and running with lots of hours on it.
The software works well but others could improve it of course.
The board is about six inched long and three inches tall.  A four=20
line by 20 character LCD  sits in the front. =20

For a number of reasons, the main board should be moved to a larger=20
box and the present format of 6 X 3 be retained for I/O functions in=20
dash mounted box.  There is lots of room for participation and=20
contribution to the project.  I think that it is important to agree=20
on format and direction so that the work can be parceled to the=20
participants.

I will post the whole project if people want to work on it and=20
improve it.  I am not the least bit interested in distributing a=20
bunch of code and drawings so that folks can argue about processors=20
or programming technique without contributing significantly to the=20
project.

The present board needs a little work, some traces have been cut and=20
jumped but about one more iteration would get finish it up.  I can=20
produce printer files for the present board. I would like to figure=20
out a way to post hand drawings of schematics.  Perhaps scanned=20
images.  A board and code exist for a test fixture that lets one=20
simulate engine conditions and run the whole thing on the bench.

I use assembled 8052 code for the core code and Basic, compiled and=20
assembled with Systronix's compiler, for the '232 and LCD screen I/O=20
routines. The box has buttons that can be used to modify the=20
inservice action of the device.  One version of the code runs on a=20
much smaller controller with no inservice I/O but has the same=20
control functions.

The processor is a Phillips 87C550. When I build more of these, the=20
logic will mostly move to an FPGA.  The code will move directly to=20
CAN capable devices.

There is no reason to build the coil driver circuitry when GM does=20
such a beautiful job of packaging the entire works for four and six=20
cylinder engines.  Two units will work for eights.  GM MAP and=20
variable reluctance magnetic pickups are a great bargain.  All of=20
these parts are hardened for an automotive environment and are=20
available at every auto parts store. The toughest procurement is for=20
wire ends to match the propritory GM configurations.  They are=20
available though.

The parts are a bargain, but not necessarily cheap. The same is true=20
for my time and probably yours.=20

The GM components add up to about $200 new, aftermarket.  I have=20
several wide temperature '550 available and some cases.  More are=20
available.  This may not be the proper forum for this project and I=20
do not have the time to manage another one.  If I figure out how to=20
use it I guess I have an FTP site available.  If you are interested=20
in extending this project, post your thoughts or e-mail direct.=20

-------------------------------------
john carroll
 jac at wave.sheridan.wy.us

---------------Original Message---------------
New question.. might develop into a thread, but I'm hoping to start=20
a discussion, and follow the whole design process through to a=20
running system.

Objective: Replace the distributor and points with a blob with some=20
inteligence.

Desired sensors: Combined engine speed/crank angle, MAP, water temp,=20
knock, and possibly air temp.

Desired outputs: 'points' output for as many coils as required. 1,2=20
or 4. Cooling fan out put. RS232 monitor port. High speed interface=20
for sensor output to possible further extension blocks.

Reasons: My engine is a 4 pot normally aspirated 1.5 liter engine.=20
Its distributor is shot, and needs replacing. It eats points, and=20
condensers and coils, and no there is no fault, all spitfires do=20
this!

Sensing: Speed and position from a machined chain sprocket bolted to=20
the front pulley (which in my case is keyed in one position to the=20
end of the crank), with 36 or 24 teeth. Pickup is to be the digital=20
magnetic pickup from RS components , it costs 16 UK Pounds or about=20
35 bucks to anybody over there if I have to send them (if you guys=20
cant buy them). MAP to be measure using MPX4250A, about 30 bucks (up=20
to 36 psi, so that allows turbos up to about 22 psi boost. Knock:=20
haven't even thought about this one yet, all suggestions welcome .=20
Water temp, million and one ways of doing this.

Processor: 68 something (but only if I'm doing the programming, if=20
you want to join, and do the software, I'll adapt to what you like)
On the fly re mapping, in flash.
All information to be made available to other systems on request, by=20
serial coms.
High speed programmable pulse chains indicating TDCs, firing points=20
etc for accurate timing by other systems (possible fuel inj?) and=20
scope diagnostics.
Remote controll of ignition events by other systems (eg, revlimiter,=20
traction control etc)

Extra sensor input from current points, to allow initial map to be=20
built from currently working mechanical system.

CUT TO THE CHASE:

Order of development:

Sensors first.

Chose sensors, and design their interfaces, then test.
Design software.
Chose uP
Design system.
Test system and refine.

Up shot.. publish the sensors and interfaces , so that other scratch=20
builders can just do a building block design on their own hardware.=20
If at the point I go 68xx(x) they want to go PC or Z80 or anything=20
else, they can, and the software design can be followed and=20
implemented, even if they cant use the code.

Things needed imediatly:

Suitable temp sensor, and a knock sensor, and preferably their=20
interface schematics if anybody has a suitable solution to these two=20
questions, I would dearly like to hear from them.

Does anybody want to join this idea.. or am I on my own for this=20
one?

A good programmer would be a bonus, I can do it, but I would prefer=20
to let somebody else do it. I am prepared to add dedicated hardware=20
for doing timing, and interrupt control, and stuff like that.=20
Anything that makes the programming easier. ;-)

Mark

(Who has decided to stop messing around and get on with it)

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