Aircraft Overheat Detection Accuracy via Ratio-Based Location
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Solution Overview
Problem
Existing systems for detecting overheat, short circuit, and open circuit events in aircraft systems face challenges in accurately determining the relative location of events due to errors caused by internal controller circuitry variations and external installation variances, leading to inaccurate readings, especially near loop start and loop end locations.
Innovation Solution
The system employs a sensing element with an inner wire, conductive outer tube, and a thermally sensitive filler, along with an electronic controller that uses nonvolatile memory to store offset values for internal and external errors, and applies a novel formula to determine relative event locations, accounting for variations and providing a drive current based on stored values to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional voltage-based location detection is used, then the system can determine event location, but accuracy deteriorates near loop start and loop end locations due to internal controller circuitry variations and external installation variances
Solution Approach 1:
The patent transforms the location detection problem from direct voltage measurement to a ratio-based calculation using the formula L = (Vs/(Vs+Ve)) * 100. This parameter transformation eliminates the impact of internal offset errors and external installation variances, maintaining accuracy across all locations including near loop terminals where traditional methods fail.
Solution Approach 2:
The patent introduces an intermediary calculation method that uses the relationship between voltages at loop start (Vs) and loop end (Ve) to determine location. This intermediary approach through ratio calculation acts as a mediator that cancels out the effects of circuitry variations and installation differences, providing reliable location detection throughout the entire sensing element length.
2Measurement precision
If internal offset values are stored and applied, then measurement accuracy improves, but device complexity increases due to additional memory and correction calculations
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing the ratio relationship in the controller's memory during normal operation. This allows the system to compensate for internal offset variations without requiring complex real-time calculations or additional hardware, as the correction factors are prepared in advance and applied through simple arithmetic operations.
3Measurement precision
If external offset values are determined and stored, then accuracy under varying installation conditions improves, but system complexity and calibration requirements increase
Solution Approach 1:
The patent changes the measurement parameter from absolute voltage values to a normalized ratio (Vs/(Vs+Ve)) that inherently compensates for external installation variances. This parameter transformation eliminates the need for complex external offset calibration and storage systems, as the ratio-based measurement automatically adapts to different installation conditions.
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 solution enhances the accuracy of event location detection by correcting for internal and external errors, reducing signal noise and ensuring precise reporting of overheat, short circuit, and open circuit events, even in varying installation conditions.
Implementation Method 1
a filler interposed between the inner wire and the conductive outer tube, where an electrical resistance of the filler lowers at a temperature indicative of an overheat event
Data Source
AI summary
Embodiments relate to systems for improved relative location identification for overheat, short circuit, and open circuit events. The systems accomplish the improvements by utilizing any, or a combination, of implementing a novel calculation formula, determining and implementing an external offset value, and determining and implementing an internal offset value.