Method and device for automatically determining an optimized approach profile for an aircraft

摘要

Method and device for automatically determining an optimized approach profile for an aircraft. The device provides for a flexible configuration change speed which is not limited to the standard single predetermined configuration change speed in order to prevent segments which are not authorized, in particular segments which are too steep, the following configuration (Ci+1) being able to be maintained during a configuration change in an upstream direction until the corresponding speed profile reaches a maximum speed.

主权项

1. A method for automatically determining an optimized approach profile for an aircraft, the approach profile comprising an intermediate approach profile comprising a sequence of segments and aerodynamic configuration change positions and a final approach profile comprising a fixed slope angle, wherein the approach profile is calculated backwards from a calculation start point, the method comprising:
at a flight management system: evaluating a type of a segment; and the method further comprising a sequence of steps to at least define on the aerodynamic configuration change positions of the intermediate approach profile and which steps involve, for each configuration change: (A) during backward calculation of the intermediate approach profile, with a continuous modification of a speed, if a predetermined speed referred to as a configuration change from an upstream configuration to a following downstream configuration is reached, evaluating a type of a segment upstream of a first position, and: (B1) if a slope of the segment upstream of the first position is of an authorized type, positioning the configuration change at the first position corresponding to the configuration change speed; (B2) if the slope of the segment upstream of the first position is of a prohibited type, maintaining a following backward configuration at the most until a corresponding speed profile reaches a maximum speed, the maximum speed being equal to a maximum configuration change speed minus a predetermined margin; and (B2a) evaluating a type of a segment upstream of a second position; and:
if a slope of a segment upstream of the second position is of an authorized type, positioning the configuration change at the second position corresponding to the maximum speed; andif the slope of the segment upstream of the second position is of a prohibited type, applying a logic for maintaining a current speed and adding a segment at a constant speed from the second position as far as a third position upstream of the upstream segment, and positioning the configuration change at the third position.