| 摘要 |
PURPOSE:To minimize the partial distribution of temperature in a cabin by allowing the opening of a mix door to be changed step by step with the smaller increment than the width of hysterisis, when the signal variation computed by an arithmatic means is found to be within the stated range. CONSTITUTION:In a device where the opening of a mix door 17 is controlled by a mix door actuator 3 through a selection output means 8 based on the output from an arithmatic means 2 which computes signals related with the deviation of the cabin (34) temperature from the target temperature, memory means 4 and 5 are provided which store No.1 and No.2 signals which are arithmatic signals from the arithmatic means 2. And a discriminating means 6 determines whether or not the difference between No.1 and No.2 signals, is within the stated range, and if it is found to be YES, an arithmatic means 7 is allowed to add or subtract the stated amount of value to or from No.2 signal permitting it to be changed by that much. Simultaneously, the selecting means 8 is switched over to the arithmatic means 7 allowing the actuator 3 to be controlled by the output of the arithmatic means 7. |
