Bezel Filter Clog Detection Using a Force Sensing Resistor
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Solution Overview
Problem
Existing information handling systems lack an effective method to determine the saturation level of filters, leading to potential airflow restrictions and inadequate cooling of components due to particle buildup, which can impact system performance.
Innovation Solution
Incorporating a force sensing resistor (FSR) between the filter and chassis bezel to measure the force exerted by airflow resistance, allowing a baseboard management controller to calculate the filter's clogged level and provide alerts for replacement or cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is installed in the chassis bezel to block particles, then particle buildup is prevented, but airflow restriction occurs when the filter becomes clogged
Solution Approach 1:
The system performs preliminary monitoring of filter saturation levels using the FSR sensor before complete clogging occurs. By detecting changes in electrical resistance caused by particle accumulation, the system can alert users to replace or clean the filter proactively, preventing total airflow blockage while maintaining continuous particle protection.
2Reliability
If the filter is monitored continuously to detect clogging, then system reliability is improved, but device complexity increases due to additional sensing components
Solution Approach 1:
The FSR sensor acts as an intermediary element that converts the physical state of filter saturation into an electrical signal. This mediator component enables continuous monitoring without requiring complex mechanical or optical sensing systems, maintaining reliability while minimizing added complexity through a simple resistance-based detection mechanism.
Solution Approach 2:
The patent replaces potential mechanical monitoring systems (such as moving parts or optical sensors) with an electrical sensing approach. The FSR sensor uses electrical resistance changes caused by particle buildup on the filter to provide monitoring data, simplifying the overall system architecture while maintaining continuous reliability.
3Device complexity
If the filter saturation level is not monitored, then device complexity is minimized, but component cooling performance deteriorates due to restricted airflow
Solution Approach 1:
The system implements feedback by continuously measuring the FSR resistance value and comparing it against threshold levels. When the filter reaches a saturation point that would restrict airflow and compromise cooling, the system provides feedback through alerts or notifications. This feedback mechanism enables proactive maintenance to preserve component cooling performance without requiring overly complex monitoring infrastructure.
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
Enables real-time monitoring and notification of filter clogging, ensuring optimal airflow and component cooling, thereby maintaining system performance and reliability.
Implementation Method 1
a force sensing resistor (FSR) between the filter and chassis bezel to measure the force exerted by airflow resistance
Data Source
AI summary
An information handling system includes a chassis, a filter, a force sensing resistor, and a baseboard management controller. The chassis includes a bezel. The filter is in physical communication with the bezel of the chassis. The force sensing resistor is in physical communication with the bezel and with the filter. The baseboard management controller communicates with the force sensing resistor and receives a voltage level from the force sensing resistor. Based on the voltage level, the baseboard management controller determines a clogged level for the filter. The baseboard management controller determines whether the clogged level is greater than a threshold level. In response to the clogged level being greater than the threshold level, the baseboard management controller determines that the filter needs to be replaced and provides a filter clogged message.