Aircraft Fuel Calculation Backup for Gauge Failure
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Solution Overview
Problem
Aircraft fuel gauges can fail, leading to inaccurate assessment of remaining fuel amounts, compromising safety.
Innovation Solution
A fuel calculation device that includes a remaining fuel amount calculation unit, failure determination unit, and display control unit to estimate and display fuel amounts even when gauges fail, using fuel flow rates and measured values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fuel gauge is used to measure remaining fuel amount, then real-time fuel level information is available, but measurement accuracy decreases when the gauge fails
Solution Approach 1:
The system performs preliminary actions by continuously calculating estimated fuel amounts based on fuel flow rates before the gauge actually fails. This allows the system to maintain accurate fuel level information even when the gauge fails, as the estimated values are already computed and ready for display.
Solution Approach 2:
The invention introduces an intermediary calculation mechanism that uses fuel flow rate sensors and integration algorithms as a mediator between the actual fuel consumption and the displayed fuel level. This intermediary system provides an alternative measurement path that remains reliable even when the direct gauge measurement fails.
2Reliability
If only fuel gauge measurement is used, then the system is simple, but safety decreases when gauge failure occurs
Solution Approach 1:
The system merges two different measurement approaches: direct gauge measurement and indirect calculation based on fuel flow rate integration. By combining these methods, the system achieves enhanced reliability through redundancy while maintaining operational simplicity, as both methods work together seamlessly under normal conditions.
Solution Approach 2:
The system changes the measurement parameter from direct level measurement (gauge) to flow rate integration (calculation). This parameter change provides an alternative measurement approach that is insensitive to gauge failures, thereby improving safety without requiring complex additional hardware.
3Measurement precision
If estimated fuel amount calculation is always performed, then backup accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs estimation calculation periodically rather than continuously, updating the estimated fuel amount at specific intervals. This periodic action maintains adequate accuracy for safety purposes while significantly reducing energy consumption compared to continuous calculation.
Solution Approach 2:
The system performs estimation calculation partially - only when gauge failure is detected or at periodic intervals - rather than continuously. This partial action provides sufficient backup accuracy when needed while minimizing unnecessary energy consumption during normal gauge operation.
Data Source
AI summary
This fuel calculation device comprises: a remaining fuel amount calculation unit that periodically calculates and stores an approximate value of the remaining fuel amount on the basis of the measurement value of the remaining fuel amount remaining in a fuel container, and the fuel flow rate of fuel supplied from the fuel container; a failure determination unit that determines whether a remaining fuel amount meter that outputs the measurement value of the remaining fuel amount has failed; and a display control unit that controls so as to display the measurement value of the remaining fuel amount when the remaining fuel amount meter has not failed, and to display the approximate value of the remaining fuel amount when the remaining fuel amount meter has failed.