Multi-Sensor Fan Speed Control for Stable Cooling and Low Noise
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Solution Overview
Problem
Existing fan controlling systems in electronic devices face issues with abrupt rotation speed changes due to temperature fluctuations, leading to reduced fan lifespan and noise generation.
Innovation Solution
A fan controlling system with multiple temperature sensors and a mapping table that linearly adjusts the fan's rotation speed based on sensed temperature ranges, using a processing module to control the fan's operation and reduce noise and extend lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotates at high rotation speed to dissipate heat efficiently, then heat dissipation performance is improved, but noise increases and fan lifespan decreases
Solution Approach 1:
The fan control system dynamically adjusts the rotation speed based on real-time temperature monitoring. Instead of maintaining a fixed high speed, the system continuously adapts the fan speed to match the actual thermal conditions, allowing the fan to operate at high speed only when necessary and reducing speed when temperature thresholds are not exceeded, thereby minimizing noise while maintaining effective heat dissipation
2Productivity
If the fan changes rotation speed frequently in response to temperature fluctuations around the threshold, then temperature control responsiveness is improved, but fan lifespan decreases
Solution Approach 1:
The system implements a hysteresis mechanism with predetermined temperature thresholds (first and second thresholds) that are set in advance. When the temperature exceeds the first threshold, the fan speed is increased; when it drops below the second threshold, the speed is reduced. This preliminary setup of threshold boundaries prevents frequent oscillations around a single threshold value, reducing the frequency of speed changes and extending fan lifespan while maintaining adequate temperature control responsiveness
3Device complexity
If a single temperature threshold is used for fan speed control, then control simplicity is improved, but fan operation stability deteriorates due to frequent switching
Solution Approach 1:
The temperature control range is segmented into multiple zones defined by a first temperature threshold and a second temperature threshold. The first threshold triggers fan speed increase, while the second threshold (set lower than the first) triggers speed reduction. This segmentation creates distinct operational zones that prevent frequent switching around a single threshold, improving fan operation stability while maintaining relatively simple control logic through the use of multiple discrete threshold values
Data Source
AI summary
A fan controlling system and method is applicable to an electronic device with a fan for adjusting a temperature of the electronic device. The fan controlling system includes a plurality of temperature sensors installed in different regions inside of the electronic device for sensing temperatures around the regions, a mapping table for mapping a plurality of temperature ranges onto a plurality of rotation speeds, and a processing module for comparing the temperatures sensed by the temperature sensors and controlling the fan to rotate according to one of the rotation speeds onto which the mapping table maps one of the temperature ranges within which a highest one of the sensed temperatures is. Therefore, the fan can operate stably and does not generate a loud noise even when its rotation speed is changing, and has a longer lifespan.