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A Stall Protection System can activate the..
  • A
    Automatic Pitch Trim just before the wing stalls.
  • B
    Autopilot when the Angle of Attack becomes too high.
  • C
    Stick Shaker just before the horizontal stabiliser stalls.
  • D
    Autothrottle when the speed drops below a minimum limit.
Some aircraft types, such as the Airbus, provide the airplanes with a high angle of attack protection which activates when the AOA becomes greater than alpha PROT. Between the alpha prot and alpha max, the alpha floor auto-thrust function will activate and command full available thrust, independent of the thrust levers position.  
Bear in mind that this is only type specific and not airplanes have this thrust increase function.
Since the correct recovery maneuver to get out of stall is to pitch the aircraft’s nose down, an inhibition logic could be used to prevent the pilot from pitching up.
 

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