Abstract
This paper proposes a novel architecture of limit protection including the references governors and limit governors and applies this architecture to limit protection in turbofan engines. References governors are designed as add-on schemes to a pre-stability engine control system that modifies reference commands to avoid constraints violation. Limit governors are proposed as an assistant part for references governors adjusting constraints to prevent references from stopping updates. The use of output admissible sets for a class of variable constraints is exploited to form invariant sets. Simulation results based on a turbofan engine model show that references governors with limit governors can effectively enforce the multiple constraints and provide enhanced engine thrust when steady violation occurs.
Highlights
The implementation of advanced control systems on aircraft turbofan engines requires the effective limit protection, which keeps the engine operating within its constraints [1]
One of the protection functions that are not based on the Min–Max structure have been developed for aircraft existing approaches to handle constraints is the model predictive control (MPC)
Paper, we we focus focuson onthe theapplication applicationofofreferences referencesgovernors governors (RGs) to to limit protection in in turbofan engines
Summary
The implementation of advanced control systems on aircraft turbofan engines requires the effective limit protection, which keeps the engine operating within its constraints [1]. These constraints prevent the engine components from risky operating conditions such as surge, stall and flame blowout avoidance, pressures and temperatures limits, over fan and core speeds, actuator magnitude and rate limits. Where L contains the indices of the regulators associated with the Min selector, H contains the indices of the regulators with the max selector, urj are the min-selected regulator outputs and urk are the max-selected regulator outputs In this paper, this approach will be considered as the traditional.
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