| 摘要 |
A motorized window covering has a motor and a housing that holds the motor and a dc battery. When the motor is energized to move a window covering, a pulse detector counts the motor current pulses to determine the position of the window covering. A user can save a motor current pulse count corresponding to a desired position and then return the desired position from a different position by simply pressing a button on a remote control unit. Further, inaccuracies caused by motor current pulses that were not counted by the pulse detector, e.g., at start up, at shut down, or during coast down, are minimized by error correction logic.
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