Coolant Level Compensation for Accurate Leak Detection
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Solution Overview
Problem
Existing aircraft cooling systems face challenges in accurately detecting coolant leakage due to temperature-induced volume changes, which can be misinterpreted as normal thermal contraction, requiring a method to differentiate between thermal expansion and actual fluid loss.
Innovation Solution
A temperature compensation system that uses a controller communicating with level and temperature sensors to correct coolant level signals based on density data, allowing for precise detection of coolant leakage by calculating the mass of coolant within the system, even under varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a level sensor is used to detect coolant level in the reservoir, then the coolant level can be monitored, but temperature-induced volume changes cause false leakage detection
Solution Approach 1:
The system changes the measurement parameter from volume-based level detection to mass-based detection by incorporating temperature compensation. The controller receives temperature signals and uses coolant density data to convert volume measurements into mass measurements, thereby eliminating false leakage detections caused by thermal expansion and contraction of the coolant.
Solution Approach 2:
The system implements feedback by continuously monitoring temperature signals from the temperature sensor and using this information to dynamically adjust the coolant level interpretation. The controller compares the actual coolant mass (corrected for temperature) against desired levels, enabling reliable leakage detection by distinguishing between thermal volume changes and actual mass loss.
2Device complexity
If coolant volume is monitored without temperature compensation, then the system is simpler, but thermal expansion is misinterpreted as coolant loss
Solution Approach 1:
The controller serves multiple functions: it monitors coolant level via the level sensor, receives temperature data from the temperature sensor, accesses coolant density information, performs temperature compensation calculations, and detects leakage conditions. This multi-functionality adds measurement precision without requiring entirely separate systems for each function.
3Measurement precision
If temperature compensation is implemented, then leakage detection accuracy improves, but system complexity increases
Solution Approach 1:
The controller acts as an intermediary that processes information from both the level sensor and temperature sensor, applies temperature compensation using coolant density data, and produces an accurate leakage detection result. This intermediary approach integrates the compensation logic without requiring direct modification of the sensors themselves, maintaining modularity while improving accuracy.
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 enables accurate detection of coolant leakage, including slow leaks, by accounting for temperature-induced volume changes, ensuring the system has sufficient fluid and preventing false alarms, with improved accuracy and reduced error margins.
Implementation Method 1
A temperature sensor is in communication with the cooling loop and is configured to provide a temperature signal
Implementation Method 2
The reservoir has a level sensor that is configured to provide a level signal indicative of a coolant level within the reservoir
Implementation Method 3
Some desired coolants may have a density that varies with temperature. As liquid temperatures change throughout the system, the system volume will also change.
Implementation Method 4
As liquid temperatures change throughout the system, the system volume will also change
Data Source
AI summary
A cooling system includes a cooling loop that includes a reservoir. The reservoir has a level sensor that is configured to provide a level signal indicative of a coolant level within the reservoir. A temperature sensor is in communication with the cooling loop and is configured to provide a temperature signal. A controller is in communication with the level sensor and the temperature sensor. The controller has a coolant density data. The controller is configured to correct the level signal based upon the temperature signal and detect a leakage condition of the cooling system. A method of determining a coolant amount within a cooling system includes the steps of determining an amount of coolant having a temperature-variable density, determining a coolant temperature, correcting the coolant amount based upon the coolant temperature, and comparing the corrected coolant amount to a desired coolant amount to detect a coolant leakage condition.