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II) SPECIFIC FAULT STRATEGIES TUNING :
A fault strategy can be implemented by adding a second line to the map, on which the three first
columns define the minimum tension below which the sensor is faulty, the maximum tension above
which the sensor is also faulty, and the converted value to give in case of error.
The faults will appear when the user diagnostic is asked.
PRESSURE SENSORS
This is an example of atmospheric pressure sensor conversion with a specific fault strategy tuning:
The sensor is a 1 bar one and the sensor conversion is given in bars on the first line.
The second line defines:
- 1st column = black-out validity limit: if the sensor tension goes down below 125 millivolts,
the sensor is declared in black-out
- 2nd column = short circuit validity limit: if the sensor tension goes up above 4950 millivolts,
the sensor is declared in short circuit (to 5 volts)
- 3rd column = replacement error value: if the sensor is declared in error, the atmospheric
pressure value will be fixed to 0.840 bars (840 millibars = widely above 2000 meters high in altitude).
Note that the standard conversion pressure sensors maps have only two columns: example:
So we had, with 'Map specific editing' function, to not only create a second line to give the fault
strategy, but also to create a third column, between the two original previous ones, because the
strategy needs 3 columns:
We began by creating a supplementary column with [Insert] function
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Challenger 4 Tuning Pack