| 摘要 |
Pulse variable information is used to control at least obstacle detection and also, optionally, speed of movement of a movable barrier. In one embodiment, pursuant to a learning mode the movable barrier is moved and, while moving the movable barrier, at least one pulse variable that corresponds to movement of the movable barrier at a desired speed is measured and used to determine at least one predetermined threshold that corresponds to a level of excessive force as exerted by the movable barrier. This threshold can then be used during an operating mode to facilitate detection of barrier obstacles.
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