Device for displaying an energy variation and an energy variation bound of an aircraft

A system for displaying information relative to a flight of an aircraft, comprising:

• an estimator configured to determine a current value of a variable representative of an energy variation of the aircraft during the flight of the aircraft;
• a monitor configured to determine a threshold value of the variable, the threshold value corresponding to an authorized acceleration bound for the aircraft to keep or bring a speed of the aircraft in or toward a predefined usage speed range;
• and
• a display device configured to show, on a viewing screen, an energy variation symbol representative of a current value of the variable and at least one energy variation bound symbol representative of the threshold value of the variable;
• wherein the energy variation bound symbol comprises an oblique segment and a vertical segment, and
• wherein the threshold value corresponds to an upper authorized acceleration bound and, when a current acceleration of the aircraft becomes strictly higher than the upper acceleration bound, the vertical segment of the energy variation bound symbol elongates relative to the oblique segment, the elongation of the vertical segment being proportional to the deviation between the value of the upper acceleration bound and the current acceleration of the aircraft;
• or wherein the threshold value corresponds to a lower authorized acceleration bound and, when a current acceleration of the aircraft becomes strictly lower than the lower acceleration bound, the vertical segment of the energy variation bound symbol elongates relative to the oblique segment, the elongation of the vertical segment being proportional to the deviation between the value of the lower acceleration bound and the current acceleration of the aircraft.

A system for displaying information relative to a flight of an aircraft, comprising:

• an estimator configured to determine a current value of a variable representative of an energy variation of the aircraft during the flight of the aircraft;
• a monitor configured to determine a threshold value of the variable, the threshold value corresponding to an authorized acceleration bound for the aircraft to keep or bring a speed of the aircraft in or toward a predefined usage speed range, the usage speed range being a maneuverability range of the aircraft defined between a maximum usage speed and a minimum usage speed;
• and
• a display device configured to show, on a viewing screen, an energy variation symbol representative of a current value of the variable and at least one energy variation bound symbol representative of the threshold value of the variable;
• wherein the estimator is configured to determine:
• a first speed range corresponding to a speed range achievable by the aircraft, the first speed range being defined between a maximum speed corresponding to a structural limit of the aircraft and a minimum speed;
• a second speed range, comprised in the first speed range, the second speed range corresponding to the usage speed range;
• a third speed range, comprised in the second speed range, the third speed range corresponding to an operational speed range of the aircraft and being defined between a maximum operational speed and a minimum operational speed;
• and wherein the monitor is configured to compare the speed of the aircraft at, each moment, to the third speed range, in order to determine whether the speed of the aircraft is comprised in the operational speed range of the aircraft, and to generate an alert, intended for the crew, if the speed at that moment is above the maximum operational speed or below the minimum operational speed.