[Diy_efi] EEPROM based efi compter, DIY style.

[Ben P]

Hi people.

Just another of my less crazy ideas, I was wondering what it would take to 
build a computer that can make a pulsewidth output based primarily on a 
voltage (ie air flow meter).

The idea would be to have four or five tables:
1: Air-flow/Pulsewidth (with pulsewidth the output)
2: TPS/RPM (pulsewidth output, overrides table one while rpm AND throttle 
position are in range)
3: TPS change/Time (pulsewidth output, added to table one/two)
4: Temperature/Pulsewidth multiplier (simple warmup strategy, or a master 
rich/lean knob)
5: O2/Pulsewidth multiplier (simple closed loop under certain TPS and temp 
conditions)

I can see this being a simple computer for converting naturally aspirated 
engines to single point efi, with a minimum of wiring required, primarily 
for economy.

so how would you go about building something that can do this? My 
electronics ability is limited to assembling kits and understanding how 
simple components (transistors, capacitors, diodes etc) work, along with 
limited BASIC programming. My main interest is in how to program the EEPROM 
chip, and how to get the inputs to the correct format (ie frequency is easy 
enough to do, but converting a voltage into a digital signal is something I 
know nothing about). I am presuming that an EEPROM chip can make a 
pulsewidth output directly (with the aid of a transistor of course), is this 
correct?

thanks
Ben

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