This technology is a subway air quality management system that operates by mounting air purification units—consisting of fans, air ducts, and filters—between the subway car roof and the tunnel ceiling. A management server controls both the purification and ventilation units based on real-time data from external and internal air quality, train operations, and ventilation status.
Subway tracks are enclosed spaces with poor natural ventilation, making them prone to trapping harmful pollutants from surface traffic. Furthermore, the piston effect generated by moving trains constantly stirs up fine dust, degrading air quality. Existing methods, which rely on ventilation facilities at tunnel entrances, have been unable to mitigate the piston effect caused by train movement itself.
This technology uses a server to monitor air quality; if external air is cleaner than internal air, it commands the purification filters to open for fresh air intake. If external air is worse, it closes the ventilation units along the route and calculates the required exhaust volume based on track spatial data. The purification units operate at a speed matched to the volume of air pushed by the train, reversing fan rotation to force exhaust in the direction opposite to the train's movement. Applicable to subway cars, station platforms, and long-distance tunnels, this system turns train operations into a mobile air purification process, effectively filtering tunnel air and preventing the influx of polluted air on days with poor outdoor air quality.
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