Adaptive Fan Speed Control for Startup Noise and Cooling Balance
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Solution Overview
Problem
Existing fan noise control methods, such as maintaining constant rotation speed or controlling based on temperature variation, can adversely affect heat dissipation and cause sudden speed changes, leading to poor user experience.
Innovation Solution
A fan noise control method that adjusts fan rotation speed based on power consumption and temperature thresholds, ensuring the fan operates at acceptable noise levels while maintaining heat dissipation by switching control modes as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan is controlled according to temperature variation, then heat dissipation is improved, but noise increases significantly during power-on stage and idle state
Solution Approach 1:
The patent implements dynamic fan control by switching between two control modes: a first control mode that limits fan speed to reduce noise during power-on and idle states, and a second control mode that controls fan speed based on temperature during high-load operations. The system dynamically selects the appropriate control mode based on real-time temperature and power consumption conditions, allowing the fan to operate quietly when necessary while maintaining effective cooling when required.
Solution Approach 2:
The patent changes the control parameters of the fan based on system state. During power-on stage and idle states, the system uses a first control parameter that limits maximum fan speed to reduce noise. When temperature exceeds a threshold or power consumption is high, the system switches to a second control parameter that allows temperature-based speed adjustment, enabling the fan to adapt its operating parameters to different system conditions.
2Object-generated harmful factors
If the fan is maintained at constant rotation speed, then noise is controlled within acceptable range, but heat dissipation performance deteriorates
Solution Approach 1:
The patent transitions from static constant-speed control to dynamic adaptive control. The system continuously monitors temperature and power consumption, then dynamically adjusts fan speed based on the selected control mode. This dynamic approach allows the fan to maintain constant speed during low-demand periods for noise control, while enabling variable speed adjustment during high-demand periods for optimal heat dissipation.
3Temperature
If the fan operates at full speed during power-on stage, then heat dissipation is improved, but noise becomes significant
Solution Approach 1:
The patent applies preliminary action by implementing a specific control strategy during the power-on stage before the system enters full operation. The first control mode is activated during power-on to limit fan speed and reduce noise, based on the understanding that immediate full-speed operation is not necessary. This preliminary control approach prepares the system for subsequent temperature-based control while minimizing initial noise impact.
Solution Approach 2:
The system dynamically adapts fan control based on the power-on stage condition. Rather than using a fixed high-speed setting, the controller dynamically selects the first control mode during power-on to balance the temporary cooling need against noise concerns, then transitions to temperature-based control as the system stabilizes.
4Temperature
If the fan speed suddenly increases during idle state, then heat dissipation responds to temperature spikes, but user experience deteriorates
Solution Approach 1:
The patent implements smooth dynamic transitions between control modes to improve user experience. When switching from the first control mode (noise-reduced) to the second control mode (temperature-based), the system does so gradually rather than with sudden speed changes. This dynamic mode switching with smooth transitions maintains temperature control effectiveness while avoiding the jarring speed changes that degrade user experience during idle states.
Data Source
AI summary
A fan noise control method includes being activated by a power-on signal to perform: controlling a rotation speed of a fan not to be greater than a first predetermined rotation speed, obtaining a power consumption of a computing device, obtaining a first temperature, wherein the first temperature is a temperature of the computing device, obtaining a second temperature, wherein the second temperature is not the temperature of the computing device, and switching from controlling the rotation speed of the fan not to be greater than the first predetermined rotation speed to controlling the rotation speed of the fan according to the first temperature when the power consumption of the computing device is greater than a first predetermined power consumption, or the second temperature is greater than a predetermined temperature.