Fan Wind Speed Control for Vulnerable Users to Prevent Cold Exposure
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Solution Overview
Problem
Existing fan control methods are prone to misidentification and inaccurate wind speed control due to camera failures, leading to reduced user experience and accelerated aging of control circuits and motors, especially when switching between start and stop modes.
Innovation Solution
A fan control method that adjusts wind speed and rotation based on user-specific parameters, including sleeping time periods, human parameters, and image information, using a damped oscillation curve control algorithm to provide soft and comfortable wind, while extending the fan's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fan is stopped or powered off when the distance between the child and the fan is relatively small, then the user experience is improved by preventing cold wind exposure, but the service life of the fan is reduced due to accelerated aging of the control circuit and motor from repeated switching
Solution Approach 1:
The fan operates in a dynamic manner by adjusting wind speed gears continuously rather than switching between on and off states. The control module adjusts the wind speed gear based on real-time distance detection, allowing the fan to operate at low wind speeds when the user is close, thereby preventing cold wind exposure while avoiding the harmful effects of repeated start-stop cycling on the motor and control circuit.
Solution Approach 2:
The system changes the operational parameter from binary (on/off) to continuous (wind speed gear levels). By adjusting the wind speed gear parameter based on detected distance, the fan can provide gentle airflow when the user is close without completely stopping, thus protecting the user from cold wind while extending the service life through reduced mechanical stress from avoided repeated switching.
2Measurement precision
If the camera is used for distance recognition, then the wind speed control accuracy is improved, but the reliability of the system deteriorates due to misidentification from camera failure
Solution Approach 1:
The patent introduces an intermediary distance detection mechanism that works alongside or替代 the camera. When the camera fails or is unavailable, the system can switch to alternative distance detection methods, ensuring continuous and reliable operation. This intermediary approach maintains measurement precision while improving system reliability by not depending solely on the camera.
Solution Approach 2:
The system prepares for potential camera failure by having alternative distance detection capabilities ready in advance. This cushioning measure ensures that if the camera fails, the system can seamlessly transition to backup methods, maintaining both distance recognition accuracy and system reliability without interruption or misidentification.
3Ease of operation
If the fan enters child mode with automatic wind speed adjustment, then the user experience is improved, but the device complexity increases due to additional control circuits and processing requirements
Solution Approach 1:
The control module is designed with multi-functionality, handling both distance detection processing and wind speed control in a single integrated unit. This universal approach allows the system to provide automatic wind speed adjustment for child mode while avoiding the need for separate dedicated circuits for each function, thereby reducing overall device complexity while maintaining ease of operation.
Data Source
Figure 1~2a
Figure 2b~3a
Figure 3b~3c
AI summary
A fan control method, comprising the following steps: S1, obtaining, after controlling a fan to enter a scene wind running mode, the sleep time of a particular user corresponding to the scene wind running mode; S2, obtaining a gear control time sequence of the fan according to the sleep time of the particular user; and S3, controlling the fan according to the gear control time sequence of the fan to adjust the wind speed of the fan. The method can provide gentler wind during sleep of particular users such as babies and pregnant women to prevent the users from catching a cold, and also can provide a quitter sleep environment for babies and pregnant women to improve their sleep quality.