抄録
An automated car ventilation system (automatic damper), that avoids the intake of the exhaust fume of the foregoing vehicles almost completely, was developed. The system utilizes two gas sensors to detect the exhaust fume, one for gasoline cars and the other for diesel cars. It is well known that semiconductor gas sensors show certain response delay and contaminated air may be introduced during the delay period. The present system adopts the air reservoir to store the outside air temporally to compensate the response delay. It has been demonstrated that the present system effectively discarded the contaminated air, while it introduced clean and fresh outside air. Further the data on highways suggested that the level and type of the contamination varies widely with the number and type(gasoline or diesel, freight or passenger) of running cars, traffic conditions, geographical features, and wind.
