Comparative Fuel Probe for Aircraft Accuracy
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Solution Overview
Problem
Existing fuel-level detection systems in aircraft, particularly capacitive fuel gauges, face challenges due to the need to account for various factors like fuel blend properties, temperature, corrosion, and humidity, leading to complexity and weight issues, and require redundant mechanical systems for reliability.
Innovation Solution
A comparative fuel probe system that uses a combination of capacitive and float-type sensors to determine a correction factor, simplifying the calculation of fuel levels by comparing capacitive readings with float readings, thereby reducing the complexity and weight of sensors needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive fuel gauges are used to detect fuel level, then measurement precision is improved, but device complexity increases due to the need to account for multiple factors like fuel blend properties, temperature, corrosion, and humidity
Solution Approach 1:
A correction factor is introduced as an intermediary element that encapsulates the complex relationships between fuel level, fuel blend properties, temperature, corrosion, and humidity. Instead of directly measuring and processing multiple individual parameters, the system uses the correction factor as a mediator to adjust capacitive readings, thereby simplifying the overall system complexity while maintaining measurement precision.
Solution Approach 2:
The system changes the parameter being processed from multiple individual factors (fuel blend properties, temperature, corrosion, humidity) to a single corrected capacitive reading. By applying the correction factor to the raw capacitive measurement, the system transforms complex multi-parameter data into a simplified single parameter that directly indicates fuel level, reducing processing complexity.
2Measurement precision
If multiple sensors and processing equipment are used to account for various factors, then measurement precision is improved, but weight increases significantly
Solution Approach 1:
The invention extracts the complex correction logic from the physical sensor assembly and encapsulates it in a mathematical correction factor. This allows the system to achieve high measurement precision without requiring additional physical sensors for each factor (temperature, humidity, corrosion, etc.), thereby significantly reducing the weight of the detection system while maintaining accuracy.
3Reliability
If a mechanical drip stick system is added as redundant backup, then reliability is improved, but device complexity and weight increase
Solution Approach 1:
The invention replaces the mechanical drip stick system with an electronic correction factor-based system. Instead of using a mechanical probe that physically contacts the fuel, the system uses capacitive sensing combined with mathematical corrections to achieve reliable fuel level detection. This substitution eliminates the need for mechanical redundancy while maintaining or improving reliability through electronic means.
4Measurement precision
If numerous factors are accounted for in calculation, then measurement precision is improved, but ease of operation deteriorates due to complex calculations
Solution Approach 1:
The correction factor is calculated and determined in advance based on the specific fuel tank conditions, fuel blend properties, and environmental factors. By performing this complex calculation beforehand, the system transforms the operational phase into a simple application of the pre-computed correction factor to the capacitive reading, thereby maintaining measurement precision while significantly improving ease of operation during actual fuel level detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides accurate fuel level determination by accounting for multiple factors in a single correction factor, reducing the weight and complexity of the detection system while ensuring reliability, including in high-intensity radiation fields.
Implementation Method 1
Capacitive fuel gauges operate by measuring the capacitance between various probes. The fuel is, in essence, working as the dielectric between the probes.
Implementation Method 2
The fuel is, in essence, working as the dielectric between the probes.
Implementation Method 3
a float assembly configured to provide a comparative float reading
Data Source
AI summary
A fuel-level detection system is configured to determine a fuel level in a fuel system. A comparative fuel probe is associated with the fuel system and includes a capacitive probe assembly configured to provide a comparative capacitive reading, and a float assembly configured to provide a comparative float reading. A comparator is configured to receive the comparative capacitive reading and to receive the comparative float reading, and to determine a corrective factor based at least in part on the comparative capacitive reading and the comparative float reading. A set of capacitive probes is associated with the fuel system. The fuel level in the fuel system is determined by comparing each local capacitive reading from each capacitive probe in the set of capacitive probes with the corrective factor.