Quote:
Originally Posted by oldbeaver
Dear AndrzejM,
I try hard to understand and follow yr thoughts, but I cannot do it fully.
RPM is also a signal that is present at every moment. When shall we consider that it is triggering the measure of Rack + ELR? Are you talking of sampling signal values?
Let me think: we have one injection per cylinder every two turns of the engine, right? Equals 0,5 injections per turn per cylinder. If so, as we have 6 cylinders, then we have: 0,5 * 6 = 3 injections per turn of the engine.
So you want to sample (measure) rack position 3 times per revolution, and just in the moment injection is produced? Is that the idea? And how do you do that?
I am very slow today but I perceive you have a very clear idea in mind, but not how it Works. But my interest increase any minute.
Thank you for the graphic and the explanation, but I still donīt follow you.
I lack of knowledge for it. Please. try to express it even simpler, if posible.
Looking forward for it,
Old Beaver
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Dear AndrzejM,
On our email conversations, we come to the fact that it is possible to get the necessary signals from a 1993 MBZ diesel turbo, non OBDII compliant, for feeding a MPGuino trip computer.
In brief:
VSS signal is available in Mercedes and possibly in any old diesel. Or can be taken from a GPS.
Fuel injection signal will be obteined from Governor + ECU and rpm.
Sampling will be triggered by revolution sensor.
To make a signal that is suitable for MPGuino, we need to process it a little bit, before input it to that board.
Y have a old MPguino, very well assembled, with English units which carries a ATMega168 processor. I tried to load to it the Canadian version of the software but it has not enough memory for that.
Due to that, I bought a ATMega 368 processor thinking in swapping it in the MPGuino, having this way a lot more memory, which we eventually may use for the additional code needed.
I also have a programmer which carries a ATMega368 also.
And I have a FreeDuino board, however, with no parts, empty. All bought in the US by mail a couple of years ago.
Bellow I attached small pictures of all these parts.
What is the best way to accomplish our objectives, from the hardware point of view?
Oldbeaver