The digital control systems for the Under-the-Wing (UTW) and Over-the-Wing (OTW) engines developed on the NASA/General Electric Quiet Clean Shorthaul Experimental Engine (QCSEE) program are described. The system to control engine variables includes three major functional parts: system sensors, digital control and system actuators. One of the primary control system functions is to prevent the engine from exceeding speed or temperature limits. The UTW control system also provides fault detection and condition monitoring. The control system requirements for the OTW engine are essentially the same as the UTW engine, however the inlet Mach number control requirement is eliminated, and failure indication and corrective action and full authority digital control are added. The digital controls scheduled the engine variables and maintained engine operation within all physical limits throughout the test program of approximately 200 hours of operation and provided stable and accurate control of both engines.


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    Title :

    Application of digital controls on the quiet clean short haul experimental engines


    Contributors:

    Conference:

    AIAA, SAE, and ASME, Joint Propulsion Conference ; 1979 ; Las Vegas, NV


    Publication date :

    1979-06-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English