Bus Air Curtain Control Using Vision-Based Temperature Screening
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Solution Overview
Problem
Existing bus cab protective doors and temperature measurement technologies fail to provide adequate protection against COVID-19 transmission, with varying door styles and inaccurate infrared measurements posing risks to bus drivers and passengers.
Innovation Solution
An intelligent air curtain system using computer vision technology to monitor passenger information, adjust air curtain supply, and broadcast warnings, integrating data collection, processing, and terminal control systems to enhance safety during epidemic prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If infrared temperature measurement guns are used to measure passenger temperatures, then the measurement is convenient and fast, but the measurement accuracy is poor and affected by measurement distance and environment
Solution Approach 1:
The patent introduces an air curtain as an intermediary protective barrier between the driver and passengers. The air curtain creates a controlled air flow that blocks respiratory droplets and aerosols from reaching the driver, while allowing optical temperature measurement to proceed through the air barrier without requiring direct contact or close proximity
2Measurement precision
If infrared thermal imaging temperature measurement technology is used to measure multiple passengers, then the temperature measurement situation can be intuitively displayed, but the cost is high and the device volume is large making it unsuitable for buses
Solution Approach 1:
The patent divides the temperature measurement function into individual passenger measurements using standard infrared guns, rather than requiring a single complex thermal imager. The air curtain enables multiple sequential measurements to be performed efficiently, achieving comprehensive temperature screening without the need for expensive thermal imaging equipment
Solution Approach 2:
The patent uses standard infrared temperature measurement guns that are already widely available and proven, rather than deploying expensive thermal imaging technology. The air curtain creates a controlled environment that allows these simpler devices to function effectively for temperature screening purposes
3Object-affected harmful factors
If bus cab protective doors are used to prevent droplet spread, then physical protection is provided to some degree, but different door styles cannot completely separate the cab space from the front door area
Solution Approach 1:
The patent employs an air curtain that uses controlled air flow (pneumatics) to create an invisible protective barrier. This air-based solution is compatible with various door styles and configurations, providing effective separation between the driver cab and passenger area without requiring specific door designs or modifications
4Object-affected harmful factors
If the air curtain is turned on to block cross-infection paths, then driver protection is improved, but energy consumption increases and cold air invasion may occur
Solution Approach 1:
The patent implements periodic temperature measurement and air curtain operation rather than continuous operation. The system measures passenger temperatures at regular intervals and activates the air curtain only when needed, reducing overall energy consumption while maintaining effective protection during critical periods
Solution Approach 2:
The patent incorporates feedback control where temperature measurement results and air curtain performance monitoring inform subsequent operational decisions. The system adjusts air curtain operation based on measured temperatures and environmental conditions, optimizing energy usage while maintaining protection effectiveness
Data Source
AI summary
An intelligent air curtain system on buses based on computer vision technology is provided, the air curtain system includes a data collection system, an information processing system, a terminal control system, and a terminal broadcast system. The data collection system collects video information in a front area. The information processing system includes an object detection part, a safety judgment part, a return air volume monitoring part, a posture judgment part, and an information calculation part. The object detection part and the safety judgment part judge the safety of a driver. The posture judgment part determines whether a passenger wears a mask properly. The information calculation part is configured to calculate a facial temperature of the passenger and transmit the facial temperature to the terminal control system and the terminal broadcast system. The terminal control system is configured to control an air curtain. The terminal broadcast system is configured for reminder.