SENSOR SYSTEM FOR SWITCHING VENTILATION INSTALLATIONS IN TRANSPORT VEHICLES Russian patent published in 2004 - IPC

FIELD: devices for switching ventilation systems in transport vehicles.

SUBSTANCE: sensor system includes gaseous sensing member whose electric resistance lowers at presence of reducing gases and increases at presence of oxidizing gases; computing unit whose outlet is connected to controller of ventilation unit. Novelty is that it is possible to feed to computing unit signal satisfying to next conditions: after increase of concentration of reducing gases, gas sensor signal fed to computing unit increases; increase of said signal is approximately equal to lowering of gas sensor signal fed to computing unit at respective increase of concentration of oxidizing gases. Computing unit provides possibility for calculating increase or lowering per time unit of gas sensor signals fed to computing unit and it also provides generation of signal for switching ventilation installation to recirculation mode as soon as increase or lowering of gas sensor signal per time unit exceeds threshold value.

EFFECT: simplified operational condition of gas sensor, simplified process of evaluating desired parameters.

23 cl, 23 dwg