| CPC A47H 5/0325 (2013.01) [E06B 9/68 (2013.01); A47H 2005/025 (2013.01); E06B 2009/6809 (2013.01)] | 6 Claims |
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1. A curtain control system, comprising:
a motor, adapted to drive a curtain up or down;
a braking module, adapted to release or brake the curtain;
a reel, which is coupled to the motor and the braking module and driven by the motor to wind the curtain up, the braking module being adapted to release the reel so as to lower the curtain or brake the reel so as to hold the curtain at the current position;
a torque-exerting module including an output reel, a storage reel, and a steel strip, wherein the reel is connected to the output reel, and the two ends of the steel strip are wound on the output reel and the storage reel respectively, and a constant torque applying a bias to wind the steel strip on the output reel is output through the output reel to counteract a part of a weight of the curtain when the reel unwinds the curtain down;
a current position detecting module, adapted to detect an absolute position of the curtain; and
a controller, electrically connected to the motor, the braking module, and the current position detecting module,
wherein when the controller receives a curtain-releasing signal, the controller controls the braking module to release the curtain and controls the current position detecting module to detect the absolute position of the curtain, and the controller calculates at least one of a current velocity and a current acceleration of the curtain according to a variation per unit time of the absolute position; when the current velocity is equal to zero or the current acceleration is smaller than zero, the controller controls the motor to lift the curtain or controls the braking module to brake the curtain at a current position.
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