Rotorcraft Flight Control for Safe Engine Shutdown
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Solution Overview
Problem
Modern helicopter designs face challenges in safely shutting down an engine during flight due to difficulties in implementing single-engine failure recovery with conventional flight control systems, which can lead to risks during reduced-engine operations.
Innovation Solution
A flight control system that continuously calculates the minimum altitude required for reduced-engine operation by balancing aircraft descent rate with engine restart time, providing a pilot display with visual indications, status messages, and caution-warning-advisory messages to ensure safe engine shutdown and restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an engine is shut down during flight to improve fuel efficiency, then energy consumption is reduced, but the risk of single-engine failure increases and flight safety deteriorates
Solution Approach 1:
The system performs preliminary actions by continuously monitoring engine parameters, calculating minimum safe altitudes, and preparing restart procedures before an actual engine failure occurs. This allows the helicopter to be pre-positioned in a safe state for single-engine operation, reducing the risk when engine shutdown is initiated for fuel efficiency.
Solution Approach 2:
The system implements continuous feedback by monitoring engine performance, calculating real-time minimum safe altitudes based on current conditions, and providing alerts to the pilot. This feedback loop ensures that the helicopter maintains safe operating parameters during reduced-engine operation, allowing fuel efficiency improvements without compromising flight safety.
2Device complexity
If conventional flight control systems are used during single-engine operation, then device complexity is reduced, but the ability to recover from engine failure deteriorates
Solution Approach 1:
The patent introduces an intermediary engine control system that acts as a mediator between the pilot and the aircraft's flight control systems. This intermediary automatically manages asymmetric blade pitch control and other complex adjustments needed for single-engine operation, allowing conventional flight controls to be used while maintaining enhanced failure recovery capabilities through automated assistance.
3Ease of operation
If engine restart procedures are simplified to improve ease of operation, then operational complexity is reduced, but the reliability of successful restart deteriorates
Solution Approach 1:
The engine restart system incorporates self-service capabilities by automatically monitoring engine parameters, determining optimal restart timing, and executing restart procedures without requiring complex manual interventions from the pilot. This automation simplifies the operation for the pilot while maintaining high restart success rates through precise computer-controlled execution of the restart sequence.
Data Source
AI summary
Various implementations described herein are directed to an aircraft having a multi-engine configuration with multiple engines. The aircraft may have a flight control system coupled to the multiple engines with a multi-engine interface. The flight control system may be configured to shutdown at least one engine of the multiple engines during reduced-engine operation by continuously calculating altitude for the reduced-engine operation based on one or more of an aircraft descent rate of the aircraft and an engine restart time of the at least one engine.