Lock Position Sensing Using Solenoid Inductance Verification
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Solution Overview
Problem
Existing lock position sensing in thrust reverser systems relies on multiple proximity switches, which can lead to inefficiencies and potential misinterpretation of lock statuses, particularly when determining the status of primary and tertiary locks.
Innovation Solution
A method involving the use of solenoid inductance values in conjunction with proximity switch data or solenoid inductance values alone to confirm lock status, allowing for more accurate determination of lock positions and preventing deployment of thrust reverser actuation systems when locks are not properly unlocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple proximity switches are used to sense lock positions, then the lock status can be monitored, but the system complexity increases and measurement accuracy may be compromised due to potential misinterpretation of lock statuses
Solution Approach 1:
The patent combines multiple sensing methods (proximity switch data and solenoid inductance measurement) into a single integrated lock status determination system. The control unit processes both proximity switch signals and inductance values together to confirm lock status, reducing reliance on any single sensor and improving overall reliability while managing system complexity through unified processing.
Solution Approach 2:
The patent introduces inductance measurement as an intermediary parameter to verify lock status. Instead of relying solely on proximity switches, the system uses inductance changes in the solenoid circuit as an additional verification layer, helping to prevent misinterpretation of lock statuses and improving measurement accuracy.
2Measurement precision
If multiple proximity switches are deployed per lock, then lock position detection is possible, but the potential for misinterpretation of lock statuses increases
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors both proximity switch outputs and solenoid inductance values, comparing them against expected values to confirm lock status. This cross-verification feedback loop prevents misinterpretation by requiring consistent readings from multiple sources before confirming a particular lock status.
Solution Approach 2:
The patent uses excessive measurement action by measuring both proximity switch positions and solenoid inductance values, then processing only the necessary combination of these measurements to confirm lock status. This approach ensures high measurement precision by gathering more data than minimally required, then using selective processing to maintain reliability.
3Measurement precision
If inductance values from solenoids are used to confirm lock status, then measurement accuracy improves, but the complexity of data processing increases
Solution Approach 1:
The control unit is designed with multi-functionality to handle both proximity switch data reading and inductance value calculation and processing. By making the control unit universal in its capabilities, the patent improves measurement precision through multiple measurement methods without requiring separate dedicated processing systems, thus managing complexity through consolidated functionality.
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
Enhances the accuracy of lock position sensing by reducing reliance on multiple proximity switches, thereby improving the reliability of thrust reverser actuation system operations.
Implementation Method 1
calculating an inductance value from a solenoid, the proximity switch and solenoid located in or around a lock
Data Source
AI summary
A method of determining the status of a lock. The method includes reading data from a proximity switch and calculating an inductance value from a solenoid, the proximity switch and solenoid located in or around a lock, and processing the data from the proximity switch and the inductance value. The method further includes comparing the processed data with an expected value to confirm the lock status.