Quote:
Originally Posted by ike84
I'm not an expert but I've exhausted my ability to learn about the sensor function operations so far, my questions are really toward how ME7.2 manages the information.
My plan is to modify the nbo2 sensor readings back to the dme in order to run rich.
The reason i asked whether the maf checked the nbo2 or vice versa is because the explicit logic that me 7.2 uses is not described anywhere that I can find and it will impact the design of my system.
If the NBO2 is the "trump all others" measure of fuel mixture settings in closed loop operations, then I can create a voltage divider to accomplish this task.
If the NBO2 readings are of secondary importance, then I need to focus moreso on modulation of the MAF output with an opamp and just feed back a constant .45V to the nbo2 sensor pickup at the dme.
The second approach would be less complicated but I don't think that it would work if the computers logic is centered around a [greater than or less to 0.45V execute x func] since the dme REQUIRES fluctuations, as opposed to a system that is shooting for a specific operational value range that it is constantly adjusting the variable outputs (i.e. fueling) to stay within.
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A few very limited things I can tell you is.
Motronic or the DME/ECU was as you may already know developed by Bosch.
I have only found limited info on the inner workings.
Searching everything I could find via Bosch only gave me very limited info.
The Motronic DME/ECU in it's various forms has been used in a wide range of automobiles.
Porsche, Rover, BMW, and even GM early on.
What you might try is cruising the BMW fourms those guys seem to be more informed and have dug deeper into the workings of the Motronic then any other place I have found.
There are people within the BMW community that have attempted or done the sort of things your talking about.
Tweaking fuel maps and lookup tables as well as changing or attempting to change the programing of the DME/ECU.
Perhaps you could find some useful info via the BMW guys.