Helicopter engine speed enhancement during heavy rotor load...

G - Physics – 05 – D

Patent

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G05D 1/00 (2006.01) B64C 27/04 (2006.01) B64D 31/06 (2006.01) G05D 1/08 (2006.01)

Patent

CA 2113729

A helicopter engine speed reference (66) is increased (117, 118) in response to heavy rotor loading (102) in excess of a threshold at the current descent rate (fig. 4). The reference speed is faded up (117, 118) at a rapid rate to 107 % of rated speed (119). After a fixed time interval (129), reduced rotor loading (122), reduced pitch angle below a threshold magnitude (121) and reduced roll angle below a threshold magnitude (120) will cause the reference speed to be faded down slowly (146, 147) to rated speed (148). Automatic increase in engine reference speed is overridden to 107 % of rated speed (203) when a battle switch is activated (201) and weapons are ready (202). Increases in engine reference speed are prohibited (207) when the helicopter is operating in quiet mode (206) or the helicopter is resting on its wheels (208).

Le régime de référence d'un moteur d'hélicoptère (66) est augmenté (117, 118) en présence d'une charge de rotor élevée (102) dépassant le seuil admissible à la vitesse descentionnelle mesurée (fig. 4). Le régime de référence (117, 118) est relevé rapidement jusqu'à 107 % du régime nominal (119). Après un intervalle fixe (129), à l'allègement de la charge du rotor (122), au passage de l'angle de pas sous un seuil donné (121) et de l'angle de roulis sous un autre seuil donné (120), le régime de référence baisse lentement (146, 147) jusqu'au régime nominal (148). Le relèvement automatique du régime de référence du moteur est limité à 107 % du régime nominal (203) lorsque l'hélicoptère passe en mode combat (210) et que l'armement est prêt à tirer (202). Aucune augmentation du régime de référence n'est possible lorsque l'hélicoptère vole en mode discret (206) ou qu'il repose sur ses roues (208).

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