| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular ventilator capable of preventing an increase in the concentration of carbon monoxide in a cabin, without using an expensive carbon monoxide sensor.SOLUTION: The vehicular ventilator comprises an engine status sensor 2 for detecting whether or not an engine is rotating, a vehicle speed sensor 3, an oxygen sensor 6 for detecting the oxygen concentration in exhaust gas and estimation means for estimating the carbon monoxide concentration in the exhaust gas from its detection result by taking in the detection result from the oxygen sensor 6, and executes control for putting an air circulation state of an air conditioner unit in an inside air circulation state when determining that the engine is rotatingly driven, a travel speed of a vehicle is zero and the carbon monoxide concentration estimated by the estimation means also exceeds a predetermined value by taking in a detection result in the engine status sensor 2, a detection result in the vehicle speed sensor 3 and an estimation result in the estimation means. |
