Rotorcraft In-Flight Engine Restart Control System
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Solution Overview
Problem
Existing engine restart systems for rotorcraft lack sufficient reliability and efficiency when restarting an engine in flight, particularly in scenarios where fuel conservation is desired or engine failures occur.
Innovation Solution
A control system that includes an engine operation control system capable of initiating health checks, processing engine mode commands, and communicating with flight control computers and engine control units to manage engine restarts, including the ability to shut down standby engines for fuel savings and automatically initiate restarts based on system status and pilot inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an engine is shut down in flight to conserve fuel, then fuel efficiency is improved, but engine restart reliability becomes critical
Solution Approach 1:
The system performs preliminary health checks and system status assessments before engine shutdown to ensure restart capability. The control system pre-configures restart parameters and monitors critical systems (fuel, ignition, air supply) to guarantee reliable engine restart when needed during flight operations.
2Reliability
If a complex control system is implemented for engine restart management, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control system merges engine restart management functions with existing flight control and engine control systems. The system integrates health monitoring, mode management, and restart execution into a unified control architecture that leverages existing sensors and actuators, reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
The system continuously monitors engine status, system health parameters, and environmental conditions, using this feedback to dynamically adjust restart parameters and provide real-time status information to pilots. This closed-loop feedback mechanism ensures reliable engine restart while simplifying control through automated decision-making based on sensor data.
3Ease of operation
If automated engine restart control is implemented, then pilot workload is reduced, but automation extent increases
Solution Approach 1:
The engine restart system operates autonomously by automatically detecting engine shutdown conditions, assessing system readiness, and executing restart sequences without pilot intervention. The control system self-manages the entire restart process including fuel flow control, ignition timing, and power setting adjustments, significantly reducing pilot workload while maintaining high levels of automation safety.
Data Source
AI summary
A control system for an in-flight engine restart system of a rotorcraft includes an engine control unit that controls and detects status of an engine. The control system also includes a flight control computer that communicates with the engine control unit, an engine operation control system, and a pilot interface including pilot controls. The engine operation control system includes a processor that initiates a health check of the in-flight engine restart system to determine an in-flight engine restart system status. The engine operation control system processes engine mode of operation commands to establish an engine mode of operation, and delivers commands to aspects of the in-flight engine restart system including the engine control unit based on processing of the engine mode of operation commands. The engine operation control system reports the in-flight engine restart system status and results of the engine mode of operation commands to the flight control computer.