| 摘要 |
PURPOSE:To make it usable in a practical way, by correcting the extent of response sensitivity to air pollution in a lowering direction when economic driving is requing is required, in case of a device shutting out the intake of the outside air according to an electric signal commensurate to a pollution level in the outside air. CONSTITUTION:During operation on a car air conditioner, when a first switch 9a in a control switch 9 is made into a circuit whereby an automatic selector mode is indicated, a rising grade G of the given output signal is calculated on the basis of a difference between the newest output signal after an A/D conversion 5 for a gas sensor 4 and the previous output signal. Next, that whether it is an economic driving mode whose circuit is made by a switch 9d or not is discriminated, and if the case is YES, it is compared with a reference value Ga while if the case if NO, another reference value Gb (<Ga) is compared with the said rising grade G. And, when G>Ga (or Ga) is the case, in order to forbid the leading of polluted air into a car room, an in and outside air selector damper 2 is turned round to the closing side of an outside air intake 1a from an actuator 8 in an effort to make it turn to an inside air circulation. |
