Closed-Loop Oscillation Mitigation via Signal Correlation

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Solution Overview

Problem

Closed-loop systems in information handling systems often experience undesirable oscillation due to unstable controller responses and oscillating workloads, leading to psychoacoustical annoyance and reduced component lifespan due to overheating.

Innovation Solution

A feedback controller system that calculates an error between a setpoint and measured process values, detects oscillation in the driving signal and operational parameters, and adjusts control parameters to minimize oscillation, using a combination of oscillation detection, correlation analysis, and gain scheduling to stabilize the system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a closed-loop feedback system is used to control air mover speed for temperature management, then temperature control capability is improved, but oscillation in the driving signal occurs causing psychoacoustical annoyance

Engineering Contradiction:

Improvetemperature control capabilityVSAvoidpsychoacoustical annoyance from oscillation

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The system uses a feedback controller that continuously monitors the driving signal for oscillation and adjusts control parameters accordingly. The feedback mechanism detects oscillation in the driving signal and operational parameters, then modifies controller behavior to reduce oscillation while maintaining temperature control effectiveness.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controller dynamically adjusts its behavior based on real-time detection of oscillation conditions. By monitoring the driving signal and operational parameters, the controller adapts its control parameters to minimize oscillation, transitioning from static control to dynamic adaptation that responds to changing system conditions.

Inventive Principle:

Principle #15Dynamics

2Speed

If controller gain is increased to improve response speed, then temperature response speed is improved, but oscillation amplitude increases

Engineering Contradiction:

Improvetemperature response speedVSAvoidoscillation amplitude

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The system changes controller parameters dynamically based on detected oscillation conditions. When oscillation is detected, the controller adjusts parameters such as gain to reduce oscillation amplitude while attempting to maintain acceptable response speed. This involves modifying control parameters in response to real-time system state.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The controller applies partial correction to the driving signal when oscillation is detected, rather than full correction that would maintain original response characteristics. By applying only the necessary correction to reduce oscillation, the system accepts some reduction in response speed to achieve stability.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If oscillation detection and correlation analysis are added to the control system, then oscillation mitigation capability is improved, but system complexity increases

Engineering Contradiction:

Improveoscillation mitigation capabilityVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control system performs self-diagnosis by automatically detecting oscillation in its own driving signal and operational parameters. The system monitors itself for oscillation conditions and autonomously adjusts control parameters to mitigate oscillation without requiring external intervention or complex additional hardware.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The feedback controller serves multiple functions: it controls temperature, detects oscillation, analyzes correlation between driving signal and operational parameters, and adjusts control parameters. By combining these functions in a single integrated controller, the system avoids the need for separate dedicated components for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10180690B2Systems and methods for mitigation of oscillation in a closed-loop system

Publication Date: 2019.01.15 DELL PROD LP

AI summary

In accordance with embodiments of the present disclosure, a system may include a feedback controller and logic. The feedback controller may be configured to, based on a setpoint value and a measured process value calculate an error between the setpoint value and the measured process value and generate a driving signal based on the error. The logic may be configured to determine if oscillation is present in the driving signal, determine if oscillation is present in an operational parameter other than the driving signal such that oscillation of such operational parameter may cause oscillation in the measured process value, determine if oscillation present in the driving signal is correlated with oscillation present in the operational parameter, and adjust a control parameter of the feedback controller responsive to determining that oscillation present in the driving signal is not correlated to oscillation present in the operational parameter.