| 摘要 |
PURPOSE: To hold a door or a flap door at an arbitrary opening position by opening a locking valve when a door movement pulse is introduced at an arbitrary point of the door, and controlling the locking valve until the locking valve is closed when a braking pulse is introduced to the door. CONSTITUTION: When a door with its locking valve 537 is opened is opened to a desired opening position, instantaneous door movement is detected by sensors 553 to 557. When the desired door position is achieved, minus acceleration is detected by the sensors 553 to 557, which is supplied to an evaluation unit 561 as a signal. The evaluation unit 561 generates a regulating signal to an actuator 539, to thereby switch the locking valve 537 to a locked position. When the door is moved to a closed position, a signal is automatically generated, and therefore the locking valve 537 remains open at the instant of closing the door. |
