Dynamic Fan Speed Thresholds for Filter Clogging Detection
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Solution Overview
Problem
Existing methods for detecting filter clogging in electronic apparatuses, such as telecommunication equipment, lack accuracy, leading to potential overheating due to inadequate detection of dust accumulation, which is critical for reliable 24/7 operation.
Innovation Solution
A method and device that monitor ambient parameters like temperature, atmosphere pressure, and supply voltage to dynamically adjust fan speed thresholds, using a lookup table to set RPM-based alarms for clogging detection, ensuring accurate and reliable alerts by comparing fan speed over a predetermined time period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple fan speed sensor and fixed threshold method is used for filter clogging detection, then the device complexity is low, but the measurement precision and reliability of clogging detection are insufficient
Solution Approach 1:
The patent applies dynamics by making the detection threshold dynamic rather than fixed. The threshold is adjusted based on ambient temperature conditions, allowing the system to adapt to varying environmental conditions. This resolves the contradiction by improving detection accuracy through dynamic adaptation while maintaining relatively simple device architecture.
Solution Approach 2:
The patent changes the detection parameter by introducing temperature as an additional variable that influences the threshold. Instead of using a single fixed speed threshold, the system uses temperature-compensated thresholds stored in lookup tables, thereby improving measurement precision without significantly increasing device complexity.
2Measurement precision
If ambient temperature compensation is introduced to improve detection accuracy, then the measurement precision improves, but the device complexity increases due to additional sensors and processing
Solution Approach 1:
The patent merges the temperature sensing function with the existing control system by utilizing the microcontroller's built-in temperature sensor. This approach improves detection accuracy through temperature compensation while avoiding the need for separate external temperature sensors, thereby minimizing the increase in device complexity.
Solution Approach 2:
The system uses its own internal temperature sensor to perform self-diagnosis and automatic threshold adjustment. This self-service approach eliminates the need for additional external sensors and reduces processing complexity, as the microcontroller handles both temperature reading and threshold selection internally.
3Reliability
If multiple ambient parameters are monitored with dynamic thresholds, then the reliability of detection improves, but the device complexity and processing requirements increase
Solution Approach 1:
The patent implements partial monitoring by focusing on the most critical ambient parameter (temperature) that has the greatest influence on fan performance. While the system is capable of monitoring multiple parameters, it prioritizes temperature compensation to achieve sufficient reliability without the full complexity of multi-parameter monitoring systems.
Solution Approach 2:
The patent uses pre-calculated threshold values stored in lookup tables that are determined during system design and testing. This preliminary action eliminates the need for complex real-time calculations during operation, as the microcontroller simply retrieves pre-determined thresholds based on measured temperature, thereby improving reliability while keeping processing requirements low.
Data Source
AI summary
The invention discloses a method and device for detecting clogging of a filter. The method comprises obtaining an ambient parameter, obtaining a threshold associated with the ambient parameter, and obtaining a speed of a fan which is located near the filter. The method further comprises comparing the fan speed with the threshold and outputting an alarm signal indicative of the clogging if the fan speed exceeds the threshold. The ambient parameter may comprise at least one of ambient temperature, atmosphere pressure and supply voltage.