Building Air Conditioning Control With Dual-Sensor Head Counting
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Solution Overview
Problem
Current building air conditioning control systems face inaccuracies in head count calculations due to limitations in image sensors and weight sensors, particularly under severe illumination changes and when passengers carry heavy goods, leading to suboptimal comfort and energy efficiency.
Innovation Solution
A dual-module system that combines weight change data from elevator sensors and image sensor data to correct head count changes, using weighted averaging to improve accuracy, with specific weighting based on error conditions detected by comparative calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image sensor is used to count head changes, then head count data can be acquired, but measurement precision deteriorates under severe illumination changes
Solution Approach 1:
The patent combines image sensor data with weight sensor data from the elevator to compensate for the weaknesses of each individual sensor. The image sensor provides head count information but fails under severe illumination changes, while the weight sensor provides weight change data that can be converted to head count estimates. By merging these two data sources through a correction mechanism, the system achieves more reliable head count measurement than either sensor alone.
Solution Approach 2:
The system uses feedback by comparing results from two different measurement approaches (image sensor and weight sensor) and using the weight sensor data to correct the image sensor data. This feedback loop allows the system to identify and compensate for errors in the image sensor measurements caused by illumination changes, thereby improving overall measurement precision.
2Measurement precision
If weight sensor is used to count head changes, then head count data can be acquired, but measurement precision deteriorates when persons carry heavy goods
Solution Approach 1:
The patent merges weight sensor data with image sensor data to compensate for the limitation where weight sensor accuracy deteriorates when persons carry heavy goods. The image sensor provides independent verification of head count that is not affected by the weight of carried goods, and combining both data sources allows the system to distinguish between weight from persons and weight from goods.
Solution Approach 2:
The system employs feedback by using image sensor head count data to correct and verify weight sensor-based head count calculations. When the image sensor detects a certain number of persons, this information feeds back to adjust the interpretation of weight change data, helping to distinguish actual head count changes from weight changes caused by carried goods.
3Measurement precision
If single sensor method is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent applies the merging principle by integrating two different sensing approaches (image sensor and weight sensor) into a unified head count measurement system. Although this increases device complexity compared to using a single sensor, the combination enables the system to overcome the limitations of each individual sensor and achieve superior measurement precision that justifies the added complexity.
Data Source
AI summary
A building air conditioning control system for controlling the comfort degree of air in at least one floor area of the building, and includes: a first head counting module to acquire first head count change data of a floor area according to a weight change of a cabin of an elevator when passing the corresponding floor area; a second head counting module to acquire second head count change data of the floor area according to data acquired by an image sensor mounted in the corresponding floor area; and an air conditioning control module to correct head count change data based on the first head count change data and the second head count change data, and control the comfort degree of air in the floor area based on the corrected head count change data. The building air conditioning control system and control method provide accurate control and good user experiences.