Control system and control method thereof
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Solution Overview
Problem
Existing air-conditioning systems face inefficiencies due to mismatched internal and external volume ratios in screw compressors, leading to over-compression or under-compression, increased power consumption, and vibration, especially when an economizer is present, which affects the compressor's performance.
Innovation Solution
A control system and method that adjusts the sliding valve position of the compressor based on real-time sensor data to match the internal volume ratio with the external system ratio, optimizing efficiency by deriving and storing a corrected volume ratio value for future use, and iteratively refining this value to maximize the coefficient of performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sliding valve position is adjusted based on the system volume ratio without considering economizer operation, then the compressor internal volume ratio matches the external system ratio, but the compressor experiences over-compression when the economizer is activated, leading to increased power consumption and reduced efficiency
Solution Approach 1:
The patent implements dynamic adjustment of the sliding valve position based on real-time detection of economizer operation state. The control system continuously monitors whether the economizer is activated and adjusts the sliding valve position accordingly, transforming the static volume ratio matching into a dynamic adaptation process that responds to changing system conditions, thereby preventing over-compression and optimizing compressor efficiency
Solution Approach 2:
The patent employs a feedback mechanism where the control system detects the economizer operation state and uses this information to adjust the sliding valve position. The system acquires the volume ratio corrected value based on the economizer state, creating a closed-loop control that continuously optimizes the compressor internal volume ratio to match external system requirements, preventing energy waste from over-compression
2Ease of operation
If the sliding valve position is directly adjusted using the system volume ratio parameter without correction, then the control system is simple to operate, but the compressor operates at suboptimal efficiency due to mismatched internal and external volume ratios
Solution Approach 1:
The control system automatically acquires and applies the volume ratio corrected value without requiring manual intervention or complex user input. The system self-adjusts the sliding valve position based on the detected economizer state and stored correction values, making the optimization process transparent and effortless for operators while maintaining high compressor efficiency
Solution Approach 2:
The patent pre-stores volume ratio corrected values for different economizer operation states in the control system. When the economizer state is detected, the corresponding corrected value is immediately retrieved and applied, eliminating the need for real-time complex calculations or manual adjustments, thus maintaining both simplicity of operation and optimal efficiency
Data Source
Figure 1
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Figure 4A
AI summary
A control system, a control method, and a compressor. The control system (100) comprises: a compressor (102) and a control apparatus (114). The compressor (102) comprises a sliding valve (232) having a plurality of sliding positions, and one sliding position of the sliding valve (232) corresponds to one internal volume ratio of the compressor (102). Under a working condition, the control apparatus (114) is configured to: acquire a volume ratio corrected value under the working condition; acquire an optimal internal volume ratio of the compressor (102) according to the volume ratio corrected value and a system volume ratio; and adjust a sliding position of the sliding valve (232) according to the optimal internal volume ratio of the compressor (102). According to the control system, the optimal internal volume ratio is obtained by acquiring the optimized volume ratio corrected value, thereby adjusting the position of the sliding valve to enable the compressor to operate efficiently.