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Runtime Assurance Protection for Advanced Turbofan Engine ControlThis paper describes technical progress made in the application of run time assurance (RTA) methods to turbofan engines with advanced propulsion control algorithms that are employed to improve engine performance. It is assumed that the advanced algorithms cannot be fully certified using current verification and validation approaches and therefore need to be continually monitored by an RTA system that ensures safe operation. However, current turbofan engine control systems utilize engine protection logic for safe combustion dynamics and stable airflow through the engine. It was determined that the engine protection logic should continue to be used to provide system safety and should be considered as a part of the overall RTA system. The additional function that an RTA system provides is to perform diagnostics on anomalous conditions to determine if these conditions are being caused by errors in the advanced controller. If this is the case, the RTA system switches operation to a trusted reversionary controller. Initial studies were performed to demonstrate this benefit. The other focus was to improve the performance of the engine protection logic, which was deemed too conservative and reduced engine performance during transient operations. It was determined that the conservative response was due to poor tuning of one of the controller channels within the protection logic. An automatic tuning algorithm was implemented to optimize the protection logic control gains based on minimizing tracking error. Improved tracking responses were observed with no change to the existing protection logic control architecture.
Document ID
Document Type
Conference Paper
Schierman, John D.
(Barron Associates, Inc. Charlottesville, VA, United States)
Neal, David A.
(Barron Associates, Inc. Charlottesville, VA, United States)
Wong, Edmond
(NASA Glenn Research Center Cleveland, OH, United States)
Chicatelli, Amy K.
(Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
August 10, 2018
Publication Date
January 8, 2018
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Meeting Information
AIAA SciTech Forum 2018(Kissimmee, FL)
Funding Number(s)
WBS: WBS 340428.
Distribution Limits
Public Use Permitted.
runtime monitoring
advance propulsion control
runtime assurance
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