| 摘要 |
PURPOSE:To maintain air-conditioning at the lowest level even if some trouble occurs by providing a trouble decision unit to monitor input factors given from sensors and the like for locking an air control door at a state before a sensor or a resistance is troubled on the basis of the output of the trouble decision unit. CONSTITUTION:For example, when a mode sensor 18 is troubled and short- circuited, its output runs off from a normal area, and an H-signal is outputted from a decision circuit 43. Then, outputs of computation amplifiers 26 and 28 as well as a NOR circuit 57 are brought to L, and a motor 2 is stopped. Similarly, when an inner air temperature, an outer air temperature, or a solar radiation sensor 9, 12, or 15, or a door opening or a room temperature setter resistance 1 or 6 is suddenly short-circuited or disconnected during operation, the effect is detected by decision circuits 43-48 in an instant, and the motor 2 is stopped. consequently, an air-mix door is fixed at a state before the trouble, and a trouble indication lamp 60 is lit. |
