Open-Loop Thermal Control for IHS Storage Cooling
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Solution Overview
Problem
Existing airflow cooling systems in Information Handling Systems (IHS) face challenges with closed-loop control systems, which can impact performance due to resource requirements and sensor failures, while open-loop systems are limited by their inability to adapt to new hardware configurations without firmware updates.
Innovation Solution
An airflow cooling system that includes a fan controller capable of retrieving airflow impedance information, determining estimated airflow delivery based on this information, and adjusting fan operations to match an airflow delivery target scaled by ambient temperature and storage device characteristics, allowing for efficient cooling without relying on sensor feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed-loop control systems are used to precisely control fan speeds based on sensor feedback, then temperature control precision is improved, but system reliability deteriorates due to sensor failures and performance impacts from data collection mechanisms
Solution Approach 1:
The patent extracts the temperature sensing function from the storage device itself and places dedicated temperature sensors in the airflow path near the storage device. This separation allows the storage device to focus on data operations while the cooling system independently monitors temperature through dedicated sensors, eliminating performance impacts from polling and improving reliability by removing sensor failures from the storage device.
Solution Approach 2:
The patent introduces dedicated temperature sensors as intermediaries between the cooling system and storage devices. These sensors are positioned in the airflow path to indirectly measure storage device temperature without requiring direct connection to or polling of the storage device, thus maintaining cooling precision while eliminating performance impacts and improving reliability.
2Reliability
If open-loop control systems are used to avoid sensor feedback issues, then system reliability is improved, but adaptability to new hardware configurations deteriorates
Solution Approach 1:
The patent implements dynamic adaptability in the open-loop control system by allowing the fan controller to automatically adjust fan speeds based on real-time temperature sensor feedback, even though this feedback is not used for closed-loop control. The system dynamically responds to changing thermal conditions and hardware configurations while maintaining the reliability benefits of open-loop control architecture.
Solution Approach 2:
The patent enables parameter changes in fan operating characteristics based on temperature sensor readings and stored thermal profiles for different hardware configurations. The fan controller can modify fan speed parameters dynamically while maintaining open-loop control, allowing adaptation to new hardware without requiring firmware updates to the control architecture.
3Measurement precision
If temperature polling mechanisms are implemented in closed-loop control systems, then temperature monitoring accuracy is improved, but productivity deteriorates due to latency in data storage operations
Solution Approach 1:
The patent segments the temperature monitoring function from the data storage operations by placing dedicated temperature sensors physically separate from the storage devices. This segmentation allows temperature monitoring to occur independently without interfering with data storage operations, maintaining both monitoring accuracy and operational productivity.
Solution Approach 2:
The patent uses dedicated temperature sensors as intermediaries that passively monitor temperature in the airflow path without requiring active polling of storage devices. This intermediary approach provides continuous temperature monitoring accuracy while eliminating the performance latency associated with polling mechanisms.
4Reliability
If fan speed is increased to compensate for sensor failures in closed-loop systems, then reliability is improved through fail-safe operation, but energy consumption increases
Solution Approach 1:
The patent applies partial action by using dedicated temperature sensors to monitor only the thermal conditions of storage devices in the immediate airflow path, rather than requiring comprehensive system-wide temperature monitoring. This partial monitoring approach provides sufficient reliability for the critical storage device cooling function while consuming less energy than full closed-loop control would require.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient airflow cooling that adapts to various hardware configurations without the need for firmware updates, improving reliability and performance by ensuring optimal airflow delivery to storage devices, even in scenarios where sensor data is limited or unavailable.
Implementation Method 1
one or more cooling fans configured to generate airflow that ventilates heated air from within the IHS
Data Source
AI summary
Method, systems are provided for providing automated open-loop control of an airflow cooling system in an IHS (Information Handling System), where the open-loop control is automatically adjusted based on changes to the components installed by the IHS. An airflow impedance, providing an amount a component physically impedes airflow, is retrieved for a new component. An estimated airflow delivery to the installed location of the new component is determined and scaled based on the airflow impedance of the new component and based on the ability to bypass the new component with ventilated airflow. An airflow delivery target for the new component is determined based on the ambient air temperature available at the installed new component. The airflow delivery target is scaled based on the installed location of the new component. The airflow cooling system is operated to equalize the estimated airflow delivery to the new component with the airflow delivery target for new component.