First off this is going to be a water/methanol injection system for my 2006 LBZ Duramax Diesel. Currently I use EFI Live to modify the engine tune and transmission shift logic. I plan on creating a map within EFI live to use the old EGR control outputs to give a signal of 0-100% to arduino. I am leaning towards this method because there is the ability to also change the injection timing and pulse width based on current egr function (really going to be methanol function). I then would use a spare input to tell the ECU what the input rate is. This would then allow the truck to fall back to a standard mapping without injection. The whole goal of the system is to improve fuel economy and towing performance.
I am using the standard pump controlled injection method. I have a 1gpm devilsown pump, 2 mcmaster carr fogger nozzles, 2 solenoids, tank low level switch, motor speed controller, tank etc.
The arduino will be mapped to stage the nozzles and pump speed to allow me to flow the appropriate amount of water/methanol.
My first step was to control the pump so I can figure out the mapping. I was going to use the off-the-shelf pump controller becasue I have never tried to motor control and was unsure about frequency and such and I also never found a shield to allow me to control a motor that pulls 10amps.
I was looking at the motor control board the other night and I think I am just going to pull the IC and directly drive the transistors connected to the the IC pwm output for now. Then I can elaborate on it later. I have no way of building a decent board so this was the easy way for me to prototype.
I guess I posted a little early in the game. IT seems that nobody really wants to touch the subject. I don't know why?