Multi-Engine Exit Priority Control for Thermal Stress Reduction
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Solution Overview
Problem
Existing multi-engine systems, such as those in rotorcraft, face challenges in efficiently transitioning from asymmetric operating regimes due to rapid power changes that cause thermal stress and reduce engine durability.
Innovation Solution
A controller-based system that manages engine power profiles by detecting exit conditions with varying priority levels, allowing for smooth transitions between engine modes, including emergency and non-emergency scenarios, to prevent adverse thermal gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the standby engine transitions rapidly from low-power to high-power mode, then the response time to emergency conditions is reduced, but thermal stress increases and engine durability decreases
Solution Approach 1:
The system dynamically adjusts the power transition rate based on detected exit conditions. When an emergency exit condition is detected, the controller implements a rapid power increase to prioritize response time. When non-emergency conditions are detected, the controller implements a gradual power increase with warm-up phases to prioritize engine durability. This dynamic adaptation resolves the contradiction by making the transition speed variable rather than fixed.
Solution Approach 2:
The controller changes the power profile parameters (rate of power increase, warm-up phase duration) based on the detected exit condition type. For emergency conditions, the power increase rate is maximized and warm-up phases are minimized or eliminated. For non-emergency conditions, the power increase rate is limited and warm-up phases are maintained. This parameter adjustment resolves the contradiction by optimizing the balance between response time and thermal stress based on operational context.
2Loss of energy
If the standby engine operates in low-power mode to save fuel, then fuel efficiency is improved, but the engine cannot provide additional power quickly when needed
Solution Approach 1:
The system performs preliminary warming-up actions when a non-emergency exit condition is detected, preparing the engine for future power demands. The controller maintains the engine in a warm state with controlled power increases and warm-up phases, ensuring the engine is ready to provide additional power quickly if needed while still operating more efficiently than full power. This preliminary preparation resolves the contradiction by balancing fuel savings with maintained power availability capability.
3Adaptability or versatility
If the controller implements multiple power profiles for different exit conditions, then adaptability to various operational scenarios is improved, but control system complexity increases
Solution Approach 1:
The control system segments exit conditions into distinct categories (emergency vs. non-emergency) with associated standardized power profiles. Rather than creating custom profiles for every possible scenario, the system divides the operational space into segments handled by predefined profiles. This segmentation resolves the contradiction by providing adaptability through categorized responses while limiting complexity through standardization within each segment.
Solution Approach 2:
The controller continuously monitors engine parameters and operational conditions, using feedback to determine which exit condition type is present and selects the appropriate power profile accordingly. The system adjusts the power transition based on real-time feedback from sensors monitoring engine state, temperature, and operational context. This feedback mechanism resolves the contradiction by enabling adaptive response to varying conditions while using a manageable set of predefined profiles rather than requiring complex real-time optimization.
Data Source
AI summary
An apparatus includes a first connection configured to connect to a first engine, a second connection configured to connect to a second engine, and a controller coupled to the first connection and the second connection. The controller is configured to detect a first exit condition having a first priority level, implement a first engine power profile responsive to a detection of a first exit condition having the first priority level for the second engine in a standby mode of operation, detect a second exit condition having a second priority level for the second engine during implementation of the first engine power profile, maintain the first engine power profile responsive to a determination that the second priority level is not greater than the first priority level, and implement a second engine power profile responsive to a determination that the second priority level is greater than the first priority level.