> In addition to the mechanical low pressure fuel injection system
    > we are doing a PicAXE system. I am trying to find somebody to do
    > the actual work as I have a limited amount of time to do it myself.
    > I am talking to a couple of candidates as we speak.
    >
    > This is a paradigm shift in EFI. One computer per injector instead of
    > many injectors per one computer. Each tiny computer is designed
   to do
    > one thing and one thing only. My rule is software complexity is
   proportional
    > to the square of the number of features or things the computer
   must do.
    >
    > PicAXE computers are super cheap. Spark plugs now use one coil per
    > plug with built in electronics. Why not one cheap, tiny, $1
   computer per
    > injector. You can use two injector systems per rotor if you wish.
   These
    > systems will work with 1 to 4 rotor engines.
    >
    > This is a cheap and simple PicAXE system written in easy to
    > learn and modify BASIC programming language. The PC sends
    > English language commands to the PicAXE and the PicAXE
    > does it.
    >
    > A pulse is taken from the engine
    > crank  angle sensor and the computer measures the intake
    > manifold pressure or mass airflow sensor (A/D) and intake air
    > temperature and fires (PWM) one injector every time the one rotor
    > engine rotates once using a mixture look up table. A hardware
    > interrupt from the crank angle sensor is the easy way while
    > a do nothing loop runs in the back ground. Max RPM is 7500 or
    > 125 pulses per second or once every 8 msec. Should be enough time
    > to do the simple job.
    >
    > I'll gladly trade off computer speed and software simplicity for
    > hardware. No compiling and no chip burning. We want to keep
    > it as simple as possible so people with no experience in
    > programming or computer hardware can program it, understand it
    > and fix it. We also gain redundancy for safety reasons.
    >
    > The injector computer will get inputs from a manifold pressure
   sensor, or
    > a mass airflow sensor and an ignition pulse. All these sensors
   are capable
    > of supplying data to more than one computer simultaneously. It is a
    > massive trade off of additional cheap hardware for much simpler
   software.
    >
    > Ultimately it is designed to be used with a new generation
    > of small PC's in the cockpit that use flash RAM instead of hard
   drives.
    > Unlike hard drives flash ram is very rugged and works at high
   altitudes.
    >
    > What we will do long term is use several of these real simple systems
    > and have them talk to one small PC in the cockpit over a simple RS232
   serial
    > network. The PC sends out an address and the PicAXE injector with
   that
    > address responds with data. There are other data gathering modules
    > from www.Omega.com <http://www.Omega.com> that work the same way.
   Many mixture maps
    > can be stored in the PC and sent to the PicAXE injector computer.
    >
    > When we get one working will will build another and test it on
    > an actual engine on the dyno.
    >
    > Here is a project I did years ago using a 6502. I was also the
    > designer of the Superkim and the sole owner of Microproducts.
    >
    > Microprocessor-Based System for Roll-Down and Acceleration Tests
    > by D.K. Lynn, C.R. Derouin, and Paul Lamar
    > Los Alamos Scientific Laboratory
    > Published in IEEE Proceedings 29th Vehicular Technology Conference
    > (The technical details of the Lamar Instruments road test system.)
    > Arlington, Illinois, March 28-30, 1979
    >
    >
    > The most user friendly suppler of PicAXE parts and prototype boards
    > is http://world-educational-services.net/
    > You can actually call them and talk to a real person.
    > Phone:410-255-6333  The product I am buying is the AXE090 -
   Exper. Board
    >
    > PH Anderson comes up first if you google PicAXE but it is very
   frustrating
    > doing biz with him. He does not return emails and he does not
    > answer his home phone let alone the fact there is no phone number
    > on his web site. I don't do PayPal.
    >
    >
    > Paul Lamar ...No rotor no motor.



   Paul,
   I like the idea of one Picaxe per injector and probably could be
   packaged
   that way.  The cockpit computer would only be used for data storage and
   program loading?  Would the Picaxes take their cue from hardware
   mechanical
   means?  So if the cockpit cpu takes a dump the engine still runs?
    Keep us
   posted.  I would like to do some breadboarding as I have the 40 pin
   trainer.

   Joe Berki
   Limo EZ


   Yes on the cockpit computer the cockpit computer being used only for
   data storage and program loading.

   The PicAXE injector computers are stand alone. Only if you want to
   tune them in the air or want to display engine data is the cockpit
   computer necessary.

   Yes the Picaxes take their cue from hardware mechanical
   means.

   Yes if the cockpit cpu takes a dump the engine still runs.

   Paul Lamar ...No rotor no motor.



How about a picaxe per spark plug too.  Each picaxe monitor inlet
temperature (manifold pressure and RPM too) and retard spark to improve
det margin.


Matt-

That might be a great idea for turbo charged engines as well.

Paul Lamar ...No rotor no motor.

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