Fan Clogging Detection via Power-Speed Deviation Correction
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Solution Overview
Problem
Existing electronic devices, such as notebook personal computers, face challenges in detecting performance degradation of cooling units due to dust clogging, which is exacerbated by fan aging, making it difficult to accurately determine when dust clogging occurs.
Innovation Solution
An electronic device with a radiator, fan, temperature measuring unit, adjustment unit, rotational speed measuring unit, deviation value calculation unit, clogging detection unit, and deviation value correction unit that calculates and corrects for fan aging to accurately detect dust clogging in the air duct by analyzing the relationship between driving power and fan rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fan rotational speed is monitored to detect dust clogging, then dust clogging detection is enabled, but fan aging causes rotational speed degradation that masks clogging detection accuracy
Solution Approach 1:
The patent changes the detection parameter from absolute rotational speed to the relationship between driving power and rotational speed. By monitoring how rotational speed responds to changes in driving power (the power-speed characteristic curve), the system can detect dust clogging regardless of fan aging. The deviation from the normal power-speed relationship indicates clogging, while accounting for the gradual speed degradation caused by aging.
Solution Approach 2:
The system continuously monitors the relationship between driving power and rotational speed, comparing actual values against predetermined normal ranges. This feedback mechanism allows the system to detect when dust clogging causes the rotational speed to deviate from expected values for a given driving power, enabling ongoing detection accuracy despite fan aging.
2Device complexity
If fan rotational speed is used as the sole detection parameter, then detection simplicity is maintained, but aging effects cause false negatives in clogging detection
Solution Approach 1:
Instead of using only rotational speed as the detection parameter, the patent introduces the relationship between driving power and rotational speed. The system measures both the driving power supplied to the fan and the resulting rotational speed, then evaluates whether their relationship deviates from normal patterns. This dual-parameter approach maintains reasonable system complexity while dramatically improving detection precision.
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 stable detection of dust clogging, compensating for fan aging effects, thereby improving the accuracy of dust clogging detection and maintenance alerts.
Implementation Method 1
Heat from the heat generating portion is transferred to the heat disperser that is in contact with it and transported to the radiator through the heat pipe
Implementation Method 2
The air cools the radiator and the heat generating portion, too
Implementation Method 3
a fan which rotates and sends air to the radiator according to a driving power
Implementation Method 4
an adjustment unit which adjusts the driving power in accordance with a driving condition corresponding to the measured temperature
Data Source
AI summary
An electronic device includes a deviation value calculation unit which calculates a deviation value from the normal boundary of the relationship between a power index associated with the driving power and the measured rotational speed of the fan, a clogging detection unit which detects, based on the deviation value, clogging in an air duct through which the fan takes in air outside the case and sends it to the radiator, and a deviation value correction unit which corrects the deviation value in accordance with aging of performance of the fan to compensate for deterioration of the clogging detection capability of the clogging detection unit caused by the aging.