Thermally Conductive Particulate Sensor for Filter Clogging Detection
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Solution Overview
Problem
Filters in electronic devices become clogged over time, reducing their effectiveness and posing risks due to inaccurate measurement methods using spaced electrodes, which can lead to erroneous readings and potential device failures.
Innovation Solution
A thermally conductive particulate sensor (TCPS) system that includes a temperature sensor to measure temperature changes and compare them to a target rate, providing a notification when a difference indicates significant particulate accumulation, thus avoiding the use of spaced electrodes and allowing for accurate monitoring of filter clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If spaced electrodes are used to measure particulate accumulation, then measurement capability is provided, but measurement precision deteriorates due to hot spots and erroneous readings
Solution Approach 1:
The patent replaces the electrical measurement system (spaced electrodes) with a thermal measurement system (thermally conductive sensor). Instead of using electrical fields to detect particulates, the invention uses thermal conduction through a thermally conductive material that accumulates particulates, measuring temperature changes to determine particulate accumulation levels. This substitution eliminates the hot spot problem inherent in electrical measurements.
Solution Approach 2:
The patent introduces a thermally conductive material as an intermediary between the measurement system and the particulates. This material serves as a mediator that accumulates particulates on its surface and conducts heat from an internal heat source, allowing indirect measurement of particulate accumulation through temperature sensing without direct electrical contact with the particulates.
2Reliability
If filters are used to remove particulates, then device safety is improved, but filter effectiveness deteriorates over time due to clogging
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring particulate accumulation on the filter using the thermally conductive sensor. The system measures temperature changes over time and provides feedback about filter clogging status, enabling predictive maintenance scheduling. This feedback loop allows the system to maintain optimal filter performance by prompting timely cleaning or replacement before significant clogging occurs.
Solution Approach 2:
The patent enables preliminary action by detecting particulate accumulation trends before the filter becomes fully clogged. By monitoring the rate of temperature change and predicting when the filter will reach its capacity, the system allows maintenance to be performed proactively rather than reactively, preventing loss of filter effectiveness and maintaining device safety.
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
The TCPS system effectively predicts when a filter needs cleaning or replacement, ensuring optimal performance and safety by providing accurate particulate accumulation measurements without the risks associated with spaced electrodes, and allowing for timely maintenance.
Implementation Method 1
The TCPS includes a thermally conductive material and a temperature sensor. The temperature sensor measures a temperature of the thermally conductive material
Implementation Method 2
A filter can be used in various types of electronic devices to remove or reduce particulates from fluid entering the electronic devices. For example, an electronic device can use a flow of air to perform convective heat transference.
Data Source
AI summary
In an example, an air filter system includes an air filter and a thermally conductive particulate sensor (TCPS). The TCPS includes a temperature sensor to measure a first temperature of the TCPS at a first time, measure a second temperature of the TCPS at a second time, and provide the measured first temperature and the measured second temperature to a controller. The controller to determine an actual rate of temperature change based on the measured first temperature and the measured second temperature, compare the actual rate of temperature change to a target rate of temperature change, and provide a notification when a difference between the actual rate of temperature change and the target rate of temperature change is greater than an accumulation threshold indicative of a threshold amount of particulate accumulation on the TCPS.