EFI system design

[Sandy]

I have one of those on my PC too, about 50% done, but toss out what you
have, might be interesting to some folks.

Sandy

At 11:08 PM 6/26/98 +1000, you wrote:
>I am designing an efi system and also an ign timing system for myself
>initially but with a view to market these eventually. I am hoping for a
>little bit of market research from the people on this list. So if i
>describe the way i plan to implement this can people comment on how easy
>they think it sounds to tune and also if it sounds "smart" enough for
>their usage.
>My background is in electronics engineering and i have also build
>several efi systems for friends race cars over the last few years. This
>system is designed for track cars and import type engines retrofitted to
>old cars that do not need to meet emissions specs.
>The aim of this system is for it to be easy for the average mechanic or
>car enthusiast to set up and get going but still have enough features so
>that when it is taken to a dyno for fine tuning the person doing the
>tuning has enough control to get it right.
>
>The plan :-
>Small alloy box approx 6" x 2" x 2"
>
>Plug in connector with screw terminals for the wires. No fancy crimps or
>soldering required.
>Pickup for engine speed and position fromn either coil -ve , reluctor,
>hall or opto sensor probably in dist but maybe crank pickup if needed.
>Drives all injectors in batch mode once per revolution.
>Sensor inputs from water temperature, air temperature, Manifold
>pressure, and throttle position.
>Auxiliiary outputs for fuel pump, idle speed valve, and valve timing
>solenoid.
>The box would have 7 trim pots adjustable via a screwdriver to adjust
>the following parameters.
>
>Idle fuel
>cruise fuel
>Cruise fuel position. Ie what load is cruise load.
>full load fuel
>cold start
>accelerator pump
>boost enrichment
>
>By pluging a PC in you will be able to edit RPM compensation for each of
>the fuel knobs, number of cylinders, and switch on points for each of
>the auxilliary outputs.
>
>Anyway this is the basic spec of the efi system I have half designed and
>built. Ie PCB layout done and software half written.
>If people are interested in more details i can share some more hints in
>the right direction and also the ign system if people are interested.
>
>
>What do you think?
>David
>