HVAC signaling system and method
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Solution Overview
Problem
Modern HVAC systems with multiple energy levels or variable speed operations are not backwards compatible with existing thermostat wiring, leading to inefficiencies and increased resource consumption.
Innovation Solution
The implementation of a signaling system that encodes signals across standard thermostat wires using a signal encoder and decoder, allowing for enhanced functionality without requiring wiring upgrades, enabling operation at reduced capacity to conserve resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing thermostat wiring is used with modern HVAC systems, then compatibility is maintained, but enhanced functionality and energy efficiency are lost
Solution Approach 1:
The signaling system enables existing two-wire thermostat wiring to perform multiple functions: traditional heating/cooling control plus variable speed control and energy level management. The encoder/decoder architecture allows a single wiring infrastructure to carry both legacy control signals and new enhanced functionality signals, making the system universally compatible while expanding capabilities.
Solution Approach 2:
The system changes the parameter encoding method by using pulse width modulation and signal frequency variations to convey multiple levels of control information through the existing wiring. Instead of requiring separate wires for each control function, the system varies temporal and frequency parameters of the electrical signals to encode enhanced control data.
2Productivity
If wiring infrastructure is upgraded to support enhanced functionality, then energy efficiency and operational control are improved, but installation cost and complexity increase
Solution Approach 1:
The signaling system enables existing two-wire thermostat wiring to perform multiple functions: traditional heating/cooling control plus variable speed control and energy level management. The encoder/decoder architecture allows a single wiring infrastructure to carry both legacy control signals and new enhanced functionality signals, making the system universally compatible while expanding capabilities.
Solution Approach 2:
The system creates a virtual copy of the enhanced control architecture by implementing encoder/decoder pairs that replicate the functionality of dedicated control wires through signal processing. The decoder at the HVAC equipment side reconstructs the control signals as if they came from separate physical wires, achieving the same operational效果 without the physical complexity.
3Reliability
If HVAC systems operate at full capacity, then heating/cooling effectiveness is maximized, but resource consumption increases
Solution Approach 1:
The system dynamically adjusts HVAC equipment operation based on real-time environmental conditions and control signals. The encoder transmits variable speed commands and energy level instructions that allow the HVAC system to continuously modulate its output, transitioning from static on/off control to dynamic variable speed operation, thereby matching output to actual demand.
Solution Approach 2:
The signaling system uses periodic pulse width modulated signals to control HVAC equipment cycling and speed variation. By varying the duty cycle and frequency of periodic control signals, the system achieves precise control over equipment operation intensity and timing, enabling energy-efficient cycling patterns that maintain comfort while reducing overall resource consumption.
Data Source
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AI summary
A system (100) incudes an equipment interface module (EIM) (120) and a control unit (140). The EIM (120) includes a signal encoder (150) that is operable to generate one or more encoded signals by encoding one or more instructions onto one or more electrical signals according to one or more received commands from a thermostat unit (130). The signal encoder is further operable to transmit the generated one or more encoded signals on one or more of a plurality of electrical wires. The control unit (140) is coupled to the EIM (120) via the plurality of electrical wires and includes a signal decoder (160). The signal decoder (160) is operable to decode the one or more instructions from the one or more encoded signals on the one or more electrical wires. The control unit (140) is operable to control one or more functions of a motor (116A) according to the decoded instructions from the signal decoder (160).