| 摘要 |
PURPOSE:To drive a door slowly and to improve the controllability by energizing or de-energizing a solenoid valve interlocked with a door for controlling the air flow passing through a heating and cooling heat-exchanger repeatedly at a predetermined frequency while said door is being moved. CONSTITUTION:A car air conditioner is provided with an inlet door 4 selecting inside and outside air intake ports 2, 3, a temperature control door 8 controlling the ratio of the air for feeding to a heater 7 in relation to the air passing through a cooler 6, a mode door 9 dividing the conditioned air into individual outlet ports 10-12 and a deaf door 13, and individual doors 4, 8, 9, 13 are operated by a negative pressure actuators 14. Each negative pressure actuator 14 is driven by the negative pressure introduced from a negative pressure tank 17 through a transfer solenoid valve 16 or an opening/closing solenoid valve 18. In this case, when the doors 4, 9 are controlled for instance, the transfer solenoid valve 16 is energized or de-energized at a fixed frequency, and after a predetermined time an energized state is maintained, thus holding the doors 4, 9 at their position. |
