Flight control laws for automatic hover hold

摘要

A system and method to control hovering flight of a rotary aircraft. The system including a lateral speed hold loop, a longitudinal loop, a vertical control loop, and a directional loop. The method includes defining a first flight envelope having a first groundspeed threshold; defining a second flight envelope having a second groundspeed threshold, the second flight envelope being defined within the first envelope; engaging a hover hold with a control law hover hold architecture as the aircraft enters the first flight envelope; and engaging a position hold with a control law position hold architecture as the aircraft enters the second flight envelope.

主权项

1. A method to control hovering flight of a rotary aircraft, the rotary aircraft having a longitudinal controller and a lateral controller, the method comprising:
defining a first flight envelope having a first groundspeed threshold; defining a second flight envelope having a second groundspeed threshold, the second flight envelope being defined within the first envelope; engaging an automatic hover hold with a control law hover hold architecture as the aircraft enters the first flight envelope; engaging an automatic position hold with a control law position hold architecture as the aircraft enters the second flight envelope; and interchanging the automatic hover hold and the automatic position hold as the rotary aircraft moves between the first flight envelope and the second flight envelope; wherein at least one of the engaging the automatic hover hold and the engaging an automatic position hold is performed in response to at least one of the longitudinal controller and the lateral controller being in a detent position.