Server Fan Speed Control With Modified PID for Stable Cooling

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Solution Overview

Problem

Existing air-cooling systems in servers face instability and prolonged stabilization time when abruptly increasing fan speed to manage high temperatures, leading to inefficient power consumption and noise control.

Innovation Solution

A fan speed control method utilizing a modified PID formula with a corrected proportional term and suppressed integral and derivative terms to rapidly adjust fan speeds based on temperature deviations, ensuring quick response to high temperatures and stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If fan speed is abruptly increased to control high temperatures, then temperature control effectiveness is improved, but system stability deteriorates and stabilization time increases

Engineering Contradiction:

Improvecomponent temperature controlVSAvoidfan speed stability

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent modifies the PID control parameters, specifically the proportional term, to dynamically adjust fan speed based on temperature deviations. By changing the control parameters rather than using fixed speed settings, the system achieves both rapid temperature response and stable fan operation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where temperature sensors continuously monitor component temperatures, and the Baseboard Management Controller adjusts fan speed based on real-time temperature data. This closed-loop feedback ensures both effective temperature control and stable fan speed operation.

Inventive Principle:

Principle #23Feedback

2Temperature

If fan speed is abruptly increased to control high temperatures, then temperature control effectiveness is improved, but stabilization time increases

Engineering Contradiction:

Improvecomponent temperature controlVSAvoidstabilization time

Core Design Contradiction:

TemperatureVSLoss of time

Solution Approach 1:

The patent prepares the control system in advance by setting appropriate PID parameters and ensuring the feedback loop is ready. When temperature deviations occur, the system can immediately respond with pre-configured control actions, reducing the stabilization time rather than reacting slowly to each temperature change.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

By dynamically adjusting control parameters based on the magnitude and rate of temperature changes, the system achieves rapid response while maintaining stability. The proportional term modification allows the system to anticipate and compensate for temperature deviations before they become critical.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12635107B2Fan speed control method

Publication Date: 2026.05.19 INVENTEC PUDONG TECH CORPOARTION

AI summary

A fan speed control method performing by a baseboard management controller includes following steps: obtaining a first temperature from a first temperature sensor, determining a first rotational speed according to the first temperature and a proportional-integral-derivative (PID) equation, wherein a proportional term of the PID equation is:∫0 tf⁡(E⁢V⁡(t),p) [EV′(t)]2⁢d⁢t-∫0 t-Δ⁢tf⁡(E⁢V⁡(t-Δ⁢t),p) [EV′(t-Δ⁢t)]2⁢dt;where t denotes time, Δt denotes an interval time, EV(t) denotes an error between the first temperature and a set temperature when the time is t, EV′(t) denotes a first derivative of EV(t), ƒ(EV(t),p) denotes a coefficient of the proportional term, and controlling said at least one fan according to said at least the first rotational speed.