Hi Barry,
This is how simple it is to get a Maximite (MM) to control efi.
The O2 sensor is connected to pin 10 on the MM.
programing running
--------------------------------------------------
BakGnd:
O2Sensor = Pin(10) 'A to D on pin 10. Read in the
voltage. Load the O2 sensor voltsd.
PWFlowPt = ScaleFact * O2Sensor ' the Scale factor is a number that
controls
'..........................................................how much fuel
is to be injected controlled
'..........................................................and depending
on the O2 reading
PWinteger = Int(PWFlowPt) 'get rid of decimal stuff if any and convert
to an integer
PWM 20, PWinteger 'pulse width on primary injectors The pulse width
comes out of
...............................' the pin connected to a transistor
switch controlling the injector
..............................' 20 times a second
GoTo BakGnd 'do it again and again
--------------------------------------------------------------------------------------------
Thats it. The engine will run on this alone. It does this over and over
again
many times a second.
You can make a test set up on the bench with a small voltage applied to
the top of a potentiometer to simulate the O2 sensor. Rotate the shaft
knob to change
the mixture reading.
Observe the result on the MM PWM out put pin with an O scope..
The program is stored as a text file on the MM SD card.
It can be read on your computer by unplugged it from the MM and
plugging it into your computer SD card reader slot. If you don't
have that you can get a SD card to USB adpater.
The MM has a complete operating system. It treats the 32 gig SD card as
a hard disk.
It works just like DOS with a lot of the same commands. You can have dozens
of variations on this program so if one doesn't work try another by just
loading it off the SD card. This takes just a few seconds.
Basically the IDE is built into the MM. There is a program editor in
the MM so you use that to write your programs. All very simple to use.
These programs can be sent as plain text email so it is easy for me to
look at
your program and suggest changes. If several more people are
doing the same thing we can share all the programs
It is all super low cost with one $60 MM per rotor. Most after
market EFI's are a $1000 or more.
Paul Lamar
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