I wonder how is designed the command chain from the throttle lever or the auto-throttle to the fuel injection in recent jetliners. I have 4 questions:
What is set by the throttle?
- When the pilot actuates the throttle, what are they setting exactly? (I can imagine the lever position corresponds to a fuel rate, to a RPM, to a thrust value, etc).
- Is this value a linear function of the throttle position (e.g. 73% of the full lever rotation is 73% of the maximum N1).
Is the throttle output standardized or customized for an engine model?
- What type of output has the throttle lever: mechanical, electric, digital data?
- Which subsystems in the engine receive the throttle output(s)?
- Is this output customized/calibrated for an engine model, or standardized.
How are the throttle outputs processed in the engine?
- Does the electronic engine control apply further adjustment to the throttle input?
How does the auto-throttle (auto-thrust) interact with the manual throttle?
- Does the auto-throttle send its command directly to the engine or to the mechanical throttle?
- Is the manual throttle position adjusted, according to the A/T output?