This project belongs to Fighter Aircraft...

Somebody is not taking this seriously, I suspect.

 

With the four numbers sets, I get a smooth X/Y curve as follows:
View attachment 131563

And it looks wrong with sets 2 and/or 3?

If you look at the three points given, they form a linear relationship to each other. I don't think the assumption that the sensor goes through 0,0 is valid.

It looks like the relationship is

Fuel = Vsense * (1.15 lb/mV) - 622 lb

of

Fuel = (Vsense - 541 mV) * (1.15 lb/mV)

My guess is that the sensor is nominally supposed to provide a 500 mV output at zero fuel and then scale at 1 V per thousand pounds, but that it has been calibrated to match the engine's calibration.

The offset actually makes sense. You want the fuel indication to become more accurate as your fuel state gets lower. In fact, in General Aviation, the only reading that a fuel gauge is required to be accurate at is zero (and few of them provide reliable indications at any other point). So the systems are designed with an offset so that they can be easily calibrated to indicate zero when empty.

 

---> Yup

It's like an back light LED Display...
I dont have any other data points....
Yes, the engine is just buffering the signal...

Then you need to know how to drive that particular LED display.

 

Thank you for your replies...
Customer provide lookup table for the conversion... Problem Solved

thanks