Hybrid Aircraft Drivetrain Power Margin Calculation for Feasible Control
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Solution Overview
Problem
Determining power limits in hybrid drive trains for aircraft is challenging due to complex architectures and heterogeneous power parameters, leading to potential power failures that can compromise flight safety, especially in VTOL aircraft, and oversizing the drive train to ensure safety increases weight and reduces embarkable mass.
Innovation Solution
A method to determine a minimum power margin by acquiring and converting power parameters into standardized units, calculating source and consumer margins, and validating control orders within available power limits using a control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power capacity of the drive train is oversized to provide a large safety margin, then flight safety is improved, but the mass of the drive train increases and the mass embarkable by the aircraft is reduced
Solution Approach 1:
The patent changes the parameter of power margin calculation from static/conservative to dynamic/real-time. By continuously monitoring actual power parameters and recalculating margins based on current operating conditions, the system can reduce the oversized capacity while maintaining safety through adaptive parameter adjustment.
Solution Approach 2:
The patent implements a feedback mechanism where power margins are continuously calculated and used to inform control decisions. The system monitors power parameters, calculates margins, and adjusts control orders accordingly, creating a closed-loop feedback system that replaces the need for oversized static capacity with dynamic adaptation.
2Reliability
If the power margin calculation is performed in real-time with high precision, then flight safety is improved, but the calculation complexity increases
Solution Approach 1:
The patent segments the power margin calculation into distinct modules: acquiring power parameters, comparing to thresholds, calculating margins for individual components, and aggregating to system-level margins. This segmentation reduces calculation complexity by breaking down the complex problem into manageable, independent steps that can be executed systematically.
Solution Approach 2:
The patent performs preliminary actions by pre-establishing threshold values for power parameters and preparing calculation frameworks before flight operations. This allows real-time calculations to focus only on measuring current parameters and applying predefined logic, significantly reducing computational complexity during critical flight moments.
3Reliability
If the hybrid drive train operates in multiple configurations to compensate for failures, then reliability is improved, but the difficulty of determining power limits increases
Solution Approach 1:
The patent creates a universal power margin calculation method that works across all operating configurations (nominal, battery-only, turbogenerator-only). By designing a single calculation framework that adapts to different configurations rather than separate systems for each, the patent simplifies power limit determination while maintaining comprehensive failure compensation capability.
Data Source
AI summary
A method for determining at least one minimum power margin of a hybrid drive train for a transport vehicle, each drive element being associated with at least one power source and at least one power consumer. The method including a step of acquiring measurements of power parameters, a step of comparing each measurement with at least one limitation threshold, so as to deduce therefrom at least one gross margin, a step of converting the gross margins into refined margins expressed according to the same common magnitude, a step of transposing into standardised margins at least at one reference point, a step of determining a source power margin and a consumer power margin at said reference point and a step of determining the minimum power margin by selecting the lowest power margin.