Stall prevention/recovery system and method

摘要

A method for operating an aircraft to prevent/recover from a stall condition includes the steps of detecting an actual vertical velocity of the aircraft, calculating vertical velocity error of the aircraft, the vertical velocity error being based upon a comparison between the actual vertical velocity of the aircraft and a commanded vertical velocity of the aircraft, and determining if the aircraft is in one of a near stalled condition and a stalled condition based upon at least the detected vertical velocity error and the polarity of the vertical velocity error. The method further includes the steps of taking control of the aircraft from an operator of the aircraft, reducing a bank angle of the aircraft, pitching the aircraft downward, and increasing the airspeed of the aircraft if the aircraft's airspeed is outside an airspeed window if the aircraft is in one of the near stalled condition and the stalled condition.

主权项

1. A method for operating an aircraft to prevent/recover from a stall condition, comprising the steps of:
providing a flight control computer; detecting an actual vertical velocity of the aircraft; calculating a vertical velocity error of the aircraft, the vertical velocity error being based upon a comparison between the actual vertical velocity of the aircraft and a commanded vertical velocity of the aircraft; determining if the aircraft is in one of a near stalled condition and a stalled condition based primarily upon the detected vertical velocity error and the polarity of the vertical velocity error; and if the aircraft is in one of the near stalled condition and the stalled condition:
taking control of the aircraft from an operator of the aircraft so that the operator does not have control authority of the aircraft;reducing a bank angle of the aircraft;pitching the aircraft downward; andincreasing the airspeed of the aircraft if the aircraft's airspeed is outside an airspeed window; detecting a new vertical velocity of the aircraft; calculating a new vertical velocity error; detecting a vertical acceleration of the aircraft; detecting an airspeed of the aircraft; determining if the aircraft is in one of a near stalled condition and a stalled condition based upon at least the calculated new vertical velocity error of the aircraft and a polarity of the new vertical velocity error of the aircraft; determining if a timer has expired if the aircraft is in one of a near stalled condition and a stalled condition; and
returning control of the aircraft to the aircraft operator if the aircraft is not in one of a near stalled condition and a stalled condition.