Fan PID Parameter Switching for Precise Temperature Control
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Solution Overview
Problem
Conventional temperature control devices in server systems face challenges with overcooling and excessive power consumption due to fixed PID controller parameters, which fail to simultaneously manage transient and steady-state response periods effectively, leading to oscillations and inefficient energy use.
Innovation Solution
A temperature control device with a PID controller that uses multiple cooling parameter groups based on a transfer function, switching between initial and calculated parameter sets depending on detected temperature ranges to optimize fan speed and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed PID control parameters are used, then the control device is simple to implement, but the transient response and steady-state response cannot be simultaneously optimized, causing overcooling and oscillations
Solution Approach 1:
The patent applies dynamics by making the PID control parameters adjustable rather than fixed. The system dynamically switches between different parameter groups (first parameter group for transient response, second parameter group for steady-state response) based on the current temperature difference between the controlled region and target temperature. This dynamic adaptation resolves the contradiction by enabling both simple implementation through automated switching and precise temperature control through context-appropriate parameters.
Solution Approach 2:
The patent implements parameter changes by using multiple sets of PID parameters (first parameter group and second parameter group) with different characteristics. The system selects appropriate parameters based on the temperature difference magnitude: larger parameters for transient response when temperature difference is large, and smaller parameters for steady-state response when temperature difference is small. This parameter variation resolves the contradiction between implementation simplicity and control precision.
2Speed
If large control parameter values are used, then the fan speed increases rapidly in transient response period, but overcooling occurs and power consumption increases
Solution Approach 1:
The system dynamically adjusts fan speed control based on temperature difference magnitude. During transient response with large temperature difference, the first parameter group enables rapid fan speed increase for quick cooling. When approaching target temperature with small difference, the second parameter group reduces fan speed to prevent overcooling and reduce power consumption. This dynamic adjustment resolves the contradiction between speed response and energy consumption.
Solution Approach 2:
The patent applies periodic action through phased control strategies: first using aggressive cooling parameters during the transient phase when temperature difference is large, then switching to conservative parameters during the steady-state phase when temperature difference is small. This phased approach ensures rapid initial response while preventing excessive energy consumption in the later stabilization phase.
3Use of energy by moving object
If small control parameter values are used, then rapid fan speed increase is avoided, but the tracking effect in transient response period deteriorates and oscillations occur
Solution Approach 1:
The system dynamically selects parameter groups based on real-time temperature difference. When temperature difference is large (transient phase), the first parameter group with larger values provides strong tracking effect and rapid response. When temperature difference is small (steady-state phase), the second parameter group with smaller values maintains stability and prevents oscillations. This dynamic selection resolves the contradiction between power consumption and tracking accuracy.
Solution Approach 2:
The patent changes PID parameters based on operating conditions: using larger parameter values in the first group for transient response when tracking accuracy is critical, and smaller parameter values in the second group for steady-state when stability is prioritized. The switching mechanism ensures appropriate parameters are applied at each stage, resolving the contradiction between power consumption and tracking effect.
4Device complexity
If single parameter group is used for PID control, then the control device is simple, but both transient and steady-state response periods cannot be simultaneously optimized
Solution Approach 1:
The patent segments the control process into two distinct phases with different parameter groups: transient response phase using the first parameter group, and steady-state response phase using the second parameter group. This segmentation allows each phase to be optimized independently with appropriate parameters, resolving the contradiction between structural simplicity and overall control performance by dividing the complex control task into manageable segments.
Solution Approach 2:
The system dynamically switches between segmented parameter groups based on the current control phase. The switching criterion (temperature difference threshold) automatically determines which parameter group to use, enabling the system to adapt to different operating conditions without manual intervention. This dynamic segmentation resolves the contradiction by maintaining simplicity through automated phase detection while achieving optimal performance in each phase.
Data Source
AI summary
A temperature control device comprises a fan, a temperature sensor, a modeling circuit and a PID controller, with the PID controller connected with the fan, the temperature sensor and the modeling circuit. The fan drives airflows for controlling the temperature of a controlled region. The temperature sensor is disposed in the controlled region and obtains a detected temperature indicating the temperature of the controlled region. The modeling circuit obtains at least one cooling parameter group based on a transfer function. The PID controller controls the fan based on an initial parameter group when the detected temperature is lower than a first temperature, and controls the fan based on said at least one cooling parameter group when the detected temperature is equal to or higher than the first temperature. The initial parameter group comprises initial parameters, with the value of each of the initial parameters equal to a preset value.