Variable speed compressor based AC system and control method
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Solution Overview
Problem
Conventional variable speed air conditioners require multi-parameter communication and new components to accurately match load, making upgrading from fixed-speed units costly and difficult, while existing fixed-speed units lack the necessary communication for precise speed adjustment.
Innovation Solution
A control system comprising a speed control calculation unit, data storage unit, and information acquisition unit that self-learns indoor load without requiring room temperature or set temperature inputs, using a lookup table to adjust compressor speed based on outdoor temperatures and sensor data, ensuring accurate speed matching within the existing on/off signaling mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional variable speed AC uses multi-parameter communication to accurately match load, then speed control precision is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent extracts the load calculation function from the indoor unit/thermostat and relocates it to the outdoor unit's microcontroller. The outdoor unit independently calculates cooling load based on outdoor temperature and runtime using stored historical data, eliminating the need for complex multi-parameter communication between indoor and outdoor units while maintaining accurate speed control.
Solution Approach 2:
The outdoor unit performs self-learning by automatically recording and analyzing its own operational data (runtime, outdoor temperature, compressor speed) to build load characteristics. This self-service approach allows the system to adapt to specific installation environments without requiring manual programming or complex communication infrastructure.
2Use of energy by moving object
If existing fixed-speed AC is upgraded to variable speed with new components, then energy efficiency is improved, but installation cost and difficulty increase
Solution Approach 1:
The patent designs the outdoor unit's microcontroller to perform multiple functions: it not only controls compressor speed but also independently calculates cooling load, stores historical operational data, and adapts to different installation environments. This multi-functionality allows the same hardware platform to serve both fixed-speed and variable-speed applications, simplifying upgrade paths.
Solution Approach 2:
The system uses parameter changes in outdoor temperature and runtime as proxies for load conditions, eliminating the need for complex temperature differential calculations that would require indoor temperature sensors. By changing the control parameters from indoor/outdoor temperature difference to outdoor temperature and runtime-based load coefficients, the system simplifies the upgrade requirements.
3Device complexity
If variable speed AC uses indoor vs outdoor temperature difference to determine load, then load estimation is simplified, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary action by pre-storing load coefficient data corresponding to different outdoor temperatures and runtimes in the microcontroller's memory. During operation, the system quickly retrieves and applies the appropriate pre-calculated coefficients rather than performing complex real-time calculations, achieving both simplicity and precision.
Solution Approach 2:
The patent replaces the traditional mechanical/thermal measurement approach (indoor temperature sensors and temperature differential calculations) with an information-processing approach using stored load coefficients based on outdoor temperature and runtime. This substitution eliminates the need for indoor temperature measurement while maintaining accurate load estimation through data-driven calculations.
Data Source
AI summary
The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control system based on a variable speed AC compressor.