Distributed Compressor Control for Simpler Refrigeration Wiring
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Solution Overview
Problem
Existing commercial refrigeration systems have complex and costly wiring due to the need for separate power and control lines for compressors, lack of continuous monitoring of operating parameters, and limited information about compressor conditions, leading to inefficiencies and potential damage during installation and operation.
Innovation Solution
A commercial refrigeration system with a compressor safety and control module that integrates digital communication over a single power and communication line, allowing for continuous monitoring of operating parameters and independent operation in case of master controller failure, reducing wiring complexity and enhancing safety and control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power and control lines are used for compressors, then control accuracy and reliability are improved, but wiring complexity and installation cost increase
Solution Approach 1:
The patent combines power transmission and control communication into a single wiring harness. The control system transmits both power and digital control signals through the same physical medium (wiring harness), eliminating the need for separate control lines while maintaining system reliability through integrated design and error correction protocols.
Solution Approach 2:
The wiring harness is designed to serve multiple functions simultaneously: it provides power transmission, control signaling, and status monitoring all through a single integrated connection. This multi-functional approach reduces the number of components and simplifies installation while maintaining full control capability.
2Reliability
If continuous monitoring of operating parameters is implemented, then system reliability and safety are improved, but device complexity and cost increase
Solution Approach 1:
The compressor control system performs self-diagnosis and continuous self-monitoring of its own operating parameters. The system automatically detects faults, monitors performance metrics, and triggers protective actions without requiring external monitoring equipment, thereby improving reliability while avoiding additional system complexity.
Solution Approach 2:
The control system continuously monitors operating parameters and uses feedback loops to adjust compressor operation in real-time. Sensors monitor parameters such as temperature, pressure, and motor current, and the control system responds automatically to maintain optimal operation and prevent faults, enhancing reliability through closed-loop control.
3Reliability
If distributed intelligence control is implemented with independent compressor operation, then system availability is improved during controller failure, but control system complexity increases
Solution Approach 1:
The control system is divided into independent modular units, with each compressor having its own intelligent control capability. This segmentation allows individual compressors to operate autonomously if the central controller fails, maintaining system availability while using standardized modular components that don't significantly increase overall complexity.
Solution Approach 2:
The control system includes built-in redundancy and fail-safe mechanisms that are prepared in advance. If the master controller fails, pre-programmed backup control logic takes over to maintain compressor operation, ensuring system availability without requiring complex real-time decision-making during failure conditions.
4Productivity
If accurate data on compressor conditions is provided, then maintenance efficiency and safety are improved, but measurement and communication complexity increase
Solution Approach 1:
The system replaces complex mechanical measurement devices with electronic sensors and digital communication. Instead of using mechanical gauges and manual readings, the patent employs electronic sensors that continuously monitor parameters and transmit data digitally, improving maintenance efficiency through automated monitoring while using compact, integrated sensor packages.
Data Source
AI summary
A commercial refrigeration system has a control system which distributes intelligence to increase granularity of the control and simplify wiring, assembly and installation. Compressors of the refrigeration system each have a bus compatible compressor safety and control module including a processor and sensors. All control and safety modules communicate over a single power and communications line with the controller, providing digital transmissions to the controller of measurements taken by the sensors. The information provided may include that the compressor is outside of a specific safety parameter, so that the controller knows not only that a safety parameter has been traversed, but exactly which one. The control and safety modules are capable of executing commands from the controller to cycle the compressors. The control and safety modules preferably contain sufficient intelligence to continue system operation upon failure of the controller. A compressor is also disclosed which has an intelligent control and safety module. The compressor also houses control and safety devices within a hermetically or semi-hermetically sealed shell. A condenser controller is also disclosed that is capable of communicating with the controller to affect intelligent control of one or more compressor fans.