Electronic Control Unit (ECU) Development Strategy
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My knowledge of the current control unit is next to nothing. Tasks here are
Verify if the pinouts of the ECU matches the limited information I currently
Take timing measurements of the ECU.
Dump the EPROM on the ECU and understand its workings
I was unable to make much sense of the EPROM. I believe some of the program
is stored on the 68HC11 that is used. I decided there was more work figuring
out the ECU than to design one from scratch.
The hardware design is straight foward. Basically it's just a microprocessor
driving 4 high powered coils - 2 injectors coils ( medium current/voltage
) and 2 spark coils ( high current/very high voltage.). To me the hardware
design is pretty much a no brainer. I'm thinking of giving away the schematics
with the unit. The idea after all is that is can be easily fixed by anyone
with a reasonable knowledge of electronics. The design uses standard off
the shelf components. Everything can be bought at Dick Smiths. I've used
an Atmel micro, the 8535. Very nice chip, 8k of Flash, 1/2k RAM and 1/2 k
of EEPROM. It also has an 8 channel ADC with 10 bit accuracy. All in a single
chip. Wonderful!. It also has an active development community using it and
GNU C compiler.
This is where the smarts are. I'm not going to give this away. If you want
you can write your own, I've given you the hardware. The software is written
completely in C. It will do everything the current controller can do, better
of course. It can be programmed in realtime by the rider by connecting to
a PC. I'm also looking at adding some handle bar mounted controller so parameters
can be tweaked on the fly.