Start circuit for electric starting of engines

F - Mech Eng,Light,Heat,Weapons – 02 – N

Patent

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Details

F02N 11/04 (2006.01) F02N 11/08 (2006.01)

Patent

CA 2384057

A start circuit controlled by an electronic control unit for providing power from one or both of a battery and TRU in parallel to a starter motor coupled to a gas turbine engine. The circuit includes contactors between the TRU and battery and a junction where the current from the TRU and battery combine. The circuit further includes two additional contactors in series between the junction and the starter motor. Voltage sensors and contactor position sensors are employed for diagnostics. A novel method of starting the engine using the start circuit contemplated by the present invention is also described. In this method, the start is initiated with power only from the battery. After a period of time power from the TRU is added.

Circuit de démarrage commandé par une unité de commande électronique afin d'alimenter en courant provenant soit d'une batterie, soit d'un ensemble transformateur-redresseur TRU, ou des deux, branchés en parallèle avec un moteur de démarrage couplé à un moteur de turbine à gaz. Ce circuit comprend des contacteurs entre le TRU et la batterie et une jonction combinant le courant provenant du TRU et de la batterie. Ce circuit, de plus, comporte deux contacteurs supplémentaires branchés en série entre la jonction et le moteur de démarrage. On utilise des détecteurs de tension et des détecteurs de position de contacteur afin d'effectuer des diagnostics. L'invention concerne également un nouveau procédé de démarrage de moteur au moyen de ce circuit de démarrage. Ce procédé consiste à déclencher le démarrage au moyen de courant provenant de la batterie seulement. Après une certaine durée, on ajoute du courant provenant de l'ensemble transformateur-redresseur (TRU).

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