Communication method, refrigeration and air conditioning-related system, and communication node
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Solution Overview
Problem
Existing large-scale refrigeration and air conditioning systems face challenges in efficiently managing data communication between multiple units, leading to potential signal attenuation and increased load on centralized control devices due to unmanaged data transmission.
Innovation Solution
A communication method is implemented where a first communication node generates a message with transmission timing information for a second node to transmit data upon detecting a state change, using a daisy chain connection and multi-hop functionality with OFDM modulation, reducing signal attenuation and load concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted from multiple indoor units to a centralized control device through outdoor units in a large-scale refrigeration and air conditioning system, then centralized control and cooperative operation are achieved, but signal attenuation occurs and load on central devices increases
Solution Approach 1:
The patent introduces a relay device as an intermediary component in the communication path between indoor units and the centralized control device. This relay device receives data from indoor units, performs signal amplification and regeneration, and forwards the cleaned signal to the central device, thereby mitigating signal attenuation without increasing the load on the centralized control device.
Solution Approach 2:
The patent segments the large-scale refrigeration and air conditioning system into multiple communication zones or groups, each managed by a relay device. This segmentation prevents excessive data transmission distances from a single indoor unit to the centralized control device, reducing signal attenuation by breaking the communication path into shorter segments with intermediate relay points.
2Adaptability or versatility
If multiple indoor units are connected to outdoor units which are connected to a centralized control device, then system scalability is improved, but load concentration on central devices occurs
Solution Approach 1:
The patent divides the system into multiple communication groups with relay devices serving as intermediate controllers for each group. Each relay device manages data collection and preliminary processing for its group, distributing the computational and communication load away from the centralized control device while maintaining system scalability through modular group expansion.
Solution Approach 2:
Relay devices act as intermediary controllers that handle data aggregation, filtering, and preliminary processing before forwarding to the centralized control device. This intermediary layer reduces the processing burden on the central device while allowing the system to scale by adding more relay devices and associated indoor units without proportionally increasing central device load.
3Productivity
If data transmission timing is not managed in a multi-node communication system, then communication simplicity is maintained, but communication efficiency decreases
Solution Approach 1:
The patent implements periodic data transmission intervals where indoor units transmit data at scheduled times rather than continuously or immediately upon state change. This periodic action improves communication efficiency by reducing unnecessary transmissions and optimizing network utilization, while the timing management is handled by simple interval counters in each device rather than complex centralized scheduling.
Solution Approach 2:
The patent incorporates preliminary actions such as data buffering and local filtering at each indoor unit and relay device before transmission. Devices prepare data in advance during idle periods and only transmit when necessary or at scheduled intervals, improving communication efficiency by reducing peak traffic while maintaining simple transmission protocols without requiring complex real-time coordination.
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 approach extends signal transmission distance, reduces load on central devices, and ensures efficient data communication by managing transmission timing, enhancing the reliability and efficiency of data exchange in refrigeration and air conditioning systems.
Implementation Method 1
using a daisy chain connection and multi-hop functionality with OFDM modulation
Data Source
AI summary
A communication method for communicating data regarding a change in state of a refrigeration and air conditioning-related unit between a plurality of communication nodes, in which a first communication node generates a message including information regarding a timing at which, when a second communication node detects a change in state, the second communication node transmits data to a communication node to which the data is to be transmitted, transmits the message generated to the second communication node, generates a message, and transmits the message generated to the second communication node.