Method and device for displaying speed information on an aircraft

摘要

The display device (1) comprises means (3) for correcting an acceleration value used for displaying on a screen (7) a speed trend of the airplane, making it possible to zero a speed trend symbol (11) when the Mach number of the airplane does not vary.

主权项

1. A method of displaying speed information on an airplane comprising the following steps performed automatically and in real time:
receiving a current air speed of the airplane; calculating a current acceleration value using said current air speed; and displaying on a viewing screen at least one speed trend symbol which is representative of an acceleration value received and which indicates a speed of the airplane at the end of a predetermined duration, wherein the speed trend symbol is displayed on a speed scale represented on the viewing screen; monitoring the aircraft and, based on the monitoring, identifying each of: the airplane being controlled to fly at a constant speed and the airplane being controlled to fly at a constant Mach number; calculating a corrected value of the current acceleration value by:
determining a current vertical speed of the airplane and a coefficient value based on a current altitude and Mach number of the airplane;calculating a corrective value based on a product of the current vertical speed and the coefficient value; andsumming the corrective value and the current acceleration value to obtain the corrected value of the current-acceleration; displaying on the viewing screen a speed trend symbol symbolizing:
the current acceleration value, while the airplane is controlled to fly at the constant speed; andthe corrected value while the airplane is controlled to fly at the constant Mach number.