| 摘要 |
<p>PURPOSE:To prevent the erroneous operation due to variation with time in an air conditioner which can detect pollution of exterior air, by taking the exterior air thereinto if the difference between the detected value and a reference value goes beyond a prescribed value and when the air in a car is within a prescribed value. CONSTITUTION:The signals of a gas sensor 4 positioned in an exterior gas inflow passage 1a for detecting the concentrations of toxic gases, an interior temperature sensor 7, etc. are stored into prescribed memories by the timer signals from a computer 6. The interior air will be taken in by the operation of a second switch 9b, the fresh air will be taken in by the operation of a third switch 9c, and automatic switching mode will be assumed by the operation of a first switch 9a, so that the interior air will be automatically taken in accordance with the output of the gas sensor 4. The output Vs thereof is compared with a minimum value Vmin, and at Vs<Vmin the first Vs becomes Vmin and will be stored from the ingnition-ON to the ignition-OFF. Then when the true output value Vout=Vs-Vmin has become larger than the reference value, it is switched to the state wherein the interior air is taken-in.</p> |
