Pseudo Temperature Fan Control for Quiet Information Handling Systems
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Solution Overview
Problem
Information handling systems face challenges in controlling fan speed effectively to maintain optimal operating temperatures and minimize noise, as conventional methods often result in fan noise issues under varying power loads and temperatures.
Innovation Solution
A method that calculates a single parameter (Tpseudo) based on measured temperature and power load, using a ratio of average to light and heavy power loads, to determine the operating fan speed, thereby optimizing fan operation and noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fan speed is increased to maintain optimal operating temperature under heavy power load, then temperature management is improved, but noise level increases
Solution Approach 1:
The patent implements dynamic fan speed adjustment based on real-time monitoring of power load and temperature conditions. The controller continuously adapts fan operation to match actual system demands, transitioning between different speed levels rather than maintaining a fixed speed, thereby optimizing the balance between cooling effectiveness and noise generation.
Solution Approach 2:
The system changes operational parameters by introducing a composite control parameter that combines power load percentage and temperature readings. This parameter transformation allows the controller to make informed decisions about fan speed by considering multiple factors simultaneously, enabling smoother transitions and more precise control over the fan operation characteristics.
2Object-generated harmful factors
If fan speed is decreased to reduce noise under light power load, then noise level is reduced, but temperature management may be compromised
Solution Approach 1:
The system employs feedback control by continuously monitoring temperature sensors and power load indicators, then using this information to adjust fan speed accordingly. The controller receives feedback from the system state and modifies fan operation to maintain temperature within acceptable ranges while minimizing noise, creating a closed-loop control system that adapts to changing conditions.
Solution Approach 2:
The patent implements dynamic fan speed adjustment based on real-time monitoring of power load and temperature conditions. The controller continuously adapts fan operation to match actual system demands, transitioning between different speed levels rather than maintaining a fixed speed, thereby optimizing the balance between cooling effectiveness and noise generation.
3Device complexity
If conventional fan control methods are used, then system simplicity is maintained, but effective fan speed control under varying power loads is compromised
Solution Approach 1:
The patent creates a universal control approach that handles multiple operating conditions (light load, heavy load, transient states) through a single integrated control algorithm. The composite parameter methodology provides a unified framework that works across different power load scenarios, eliminating the need for separate control strategies for each condition and simplifying the overall control architecture.
Solution Approach 2:
The system introduces an intermediary composite parameter that mediates between power load information and temperature readings to determine appropriate fan speed. This intermediate calculation layer translates complex multi-factor conditions into a single control directive, simplifying the decision-making process while improving control effectiveness across varying operating conditions.
Data Source
AI summary
A method for controlling operation of a fan in an information handling system using a single parameter includes measuring a temperature associated with the information handling system, determining an average power load of the information handling system, determining a ratio based on the average power load, a light power load and a heavy power load, calculating a single parameter based on the measured temperature and the ratio, determining an operating fan speed based on the single parameter and signaling a fan to operate at the operating fan speed. The ratio may be difference between the average power load and the light power load divided by a difference between a heavy power load minus the light power load. Determining an operating fan speed may include applying one or more constants to the ratio.