Air Conditioner Control Using CO2 Trends for Occupancy Detection
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Solution Overview
Problem
Current intelligent air condition systems rely on simple temperature and humidity sensors, leading to inaccurate control decisions and energy inefficiencies, particularly when determining user presence or absence based on luminaire device status.
Innovation Solution
An intelligent control system that uses multiple sensors, including CO2, PM2.5, and image capture units, to monitor environmental parameters and adjust air condition device operations based on trends and user presence, reducing false determination probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air condition device is controlled based solely on luminaire device status, then the control operation is simple, but false determination probability increases and control accuracy deteriorates
Solution Approach 1:
The patent combines multiple detection methods (luminaire status detection, CO2 concentration detection, and image capture) into a unified control system. The control device integrates data from these different sources to determine user presence, merging simple status checking with more complex environmental sensing to achieve both operational simplicity and high accuracy.
Solution Approach 2:
The patent introduces CO2 concentration as an intermediary parameter to verify user presence. Instead of directly relying on luminaire status, the system uses CO2 levels as a mediator to confirm whether users are actually present in the room, reducing false determinations while maintaining simple control operations.
2Measurement precision
If multiple sensors are used to improve control accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The control device is designed with multi-functionality, serving as both a simple luminaire status checker and a complex environmental monitoring system. By making the control device universal, the patent avoids adding separate dedicated systems for each function, thereby improving measurement precision without proportionally increasing overall device complexity.
Solution Approach 2:
The system uses existing infrastructure (luminaire devices, built-in CO2 sensors, and image capture units) rather than requiring entirely new dedicated components. The control device leverages these existing elements to perform multiple functions, reducing the need for additional complex hardware while improving detection accuracy.
3Loss of energy
If the air condition device turns off automatically based on luminaire status, then energy efficiency improves, but user convenience deteriorates due to false determination
Solution Approach 1:
The patent implements a feedback mechanism where the control device continuously monitors multiple parameters (luminaire status, CO2 concentration, and image data) to verify user presence before making turn-off decisions. This feedback loop ensures that the air condition device only turns off when users are truly absent, preventing energy waste while avoiding false determinations that would inconvenience users.
Solution Approach 2:
The system performs preliminary verification using CO2 concentration and image capture before executing the turn-off action. By checking multiple indicators in advance, the system ensures that turning off the air condition device will not inconvenience users who are still present, thereby maintaining both energy efficiency and user convenience.
Data Source
AI summary
An intelligent control method used in an intelligent control system includes an intelligent control device and an air condition device. The intelligent control device records CO2 amount value in an area continuously after the air condition device is started, and calculates a CO2 reference value based on the recorded CO2 amount value after a luminaire device in the area is turned off. Then, the intelligent control device records the CO2 amount value for a time period and calculates a CO2 compared value after the time period passes. The intelligent control device determines whether the CO2 amount value trend is varied upwardly or downwardly for choosing among keeping the current state, switching the operating mode of the air condition device or turning off the air condition device.