MPG Cruise Control Algorithm

[GasSavers_maximilian]

After analyzing how I'd try and optimize fuel economy if I were limited to only the information available from the OBDII port, I came up with the following. I can think of a few ways to make it more involved, but it may not be necessary so I figured I'd run it by the more experienced hypermilers out there. A simple system couldn't take advantage of anticipation (speeding up before going uphill or coasting to stop signs), but one with GPS could in theory, so as a separate issue, I would love to see any thoughts you have for that algorithm as well. I hope my pseudo-code is clear. I didn't want to create a flowchart.

Repeat {

if( speed <= MIN_SPEED ) {

// very steep uphill, economy is not the concern
adjust throttle as needed to maintain MIN_SPEED;

} else if( throttle <= MAX_EFFICIENT_THROTTLE ) {

// level travel, downhill, and shallow uphill
adjust throttle to be as low as possible to maintain at least LEVEL_CRUISE_SPEED;

} else {

// moderately steep uphill
keep throttle at MAX_EFFICIENT_THROTTLE, allowing speed to diminish;

}

}