| 摘要 |
PURPOSE:To enable to prevent overdrive of a door, by applying a short-time pulse to an actuator little by little repeatedly until an actual opening and closing angle coincides with a target angle of opening and closing control of an air mixing door. CONSTITUTION:A CPU102 of a controller 10 computes a target angle A of opening and closing control of an air mixing door 4 through information from a switch sensor group 11. Then when angles A, R are both in the vicinity of either open end of closed end, opening or closing solenoid pumps 81, 82 of actuator 8 are opened or closed through an amplifier 12 by giving a long-time pulse so that the angle R coincides with the angle A through information from a potentiometer 9 corresponding to the actual opening or closing angle R. When both the angles A, R are in an intermediate region, a short-time pulse is given, then a matter whether both the angles A, R have entered within a range of a allowable error angle (a) or not is decided and when they are not within the angle (a), the short-time pulse is output repeatedly. With this construction, overdrive is prevented and comfortable air conditioning can be done. |
