Heat Pump Three-State Control Using Modified Y Signal Protocol
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Solution Overview
Problem
Conventional 24 VAC systems used in cooling air-conditioning systems lack the necessary signal lines to control the three states (shutdown, cooling, and heating) required for heat pump systems, necessitating costly modifications or additional wiring and communication schemes that are prone to interference.
Innovation Solution
A heat pump air conditioning system with an outdoor unit featuring a main controller unit, sensor acquisition unit, data storage unit, and driving unit that interprets thermostat instructions and manages mechanical components like the compressor, fan, and four-way valve, using a modified Y signal protocol to distinguish between cooling and heating modes without requiring line transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional signal lines (O or B) are added to the conventional 24 VAC system to enable three-state control, then the heat pump system can achieve cooling and heating functions, but the wiring cost increases and the installation complexity increases
Solution Approach 1:
The patent makes the existing Y signal line perform multiple functions by encoding different control states (cooling, heating, shutdown) through different signal patterns rather than requiring separate dedicated lines for each function. The Y line universally handles both cooling control and heating control by varying its signal characteristics.
Solution Approach 2:
The patent changes the parameters of the existing Y signal (frequency, duty cycle, pulse width) to encode different control states. By modulating the signal parameters rather than adding new signal lines, the system achieves three-state control using the same physical wiring infrastructure.
2Device complexity
If network communication (RS485, CAN bus) is used to transmit control signals, then three-state control can be achieved without additional wiring, but the system cost increases and the transmission reliability decreases due to distance and obstacles
Solution Approach 1:
The patent replaces complex electronic communication protocols (RS485, CAN bus) with a simplified electrical signal modulation approach using the existing 24 VAC infrastructure. This substitution maintains reliability by using robust electrical signals that are less susceptible to interference while avoiding the complexity of digital communication networks.
Solution Approach 2:
The existing Y signal line serves itself by being modulated to carry multiple control functions without requiring separate communication infrastructure. The line that originally only controlled cooling now self-adapts to also control heating and shutdown states through parameter modulation.
3Ease of operation
If wireless transmission is used to control the outdoor unit, then installation flexibility improves, but the system cost increases due to wireless modules and the signal is easily affected by distance and obstacles
Solution Approach 1:
The patent extracts the control function from complex wireless communication modules and implements it directly through the existing electrical infrastructure. By taking out the need for wireless transceivers and processing units, the system achieves control through simple signal modulation on the Y line.
Solution Approach 2:
The patent uses the existing, already-installed Y signal line infrastructure rather than adding expensive wireless modules. The solution leverages the existing wiring as a free communication medium, avoiding the cost of additional hardware while maintaining control functionality.
Data Source
AI summary
The present disclosure relates to the field of air conditioning technology. In particular, it involves a heat pump system and control method.