Method of controlling a motorized window treatment

An electronic drive unit for controlling a motorized window treatment comprising:

• a motor coupled to the motorized window treatment for moving the motorized window treatment;
• a rotational position sensor coupled to the motor;
• a motor drive circuit coupled to the motor;
• a controller coupled to the motor drive circuit operable to drive the motor drive circuit so as to control the rotation of the motor to control the motorized window treatment in response to a command, the controller coupled to the rotational position sensor and operable to determine a rotational position of the motor, the controller further operable to adjust a present position of the motorized window treatment in response to the rotational position of the motor;
• a memory coupled to the controller, such that the controller is operable to store the command in the memory, the controller further operable to store the present position of the motorized window treatment in the memory in response to determining that the rotational position of the motor has changed by a predetermined angle, such that the controller stores the present position of the motorized window treatment in the memory each time the rotational position of the motor changes by the predetermined angle, and a plurality of positions are stored in the memory;
• wherein the controller is operable to recall the command from the memory after the controller is reset, examine the plurality of positions stored in the memory to locate a discontinuity in the plurality of positions, and determine the present position of the motorized window treatment in response to locating the discontinuity in the plurality of positions, the controller further operable to automatically drive the motor drive circuit in response to the command and the present position after the command has been recalled from the memory and the present position of the motorized window treatment has been determined.

A method of controlling a motorized window treatment through an overload condition in which a motor of the motorized window treatment draws substantially large amount of current of transitory duration, the method comprising the steps of:

• adjusting a present position of the motorized window treatment in response to the rotational position of the motor;
• storing the present position of the motorized window treatment in the memory each time the rotational position of the motor changes by the predetermined angle, such that a plurality of positions are stored in the memory;
• storing a desired position of the motorized window treatment prior to the overload condition;
• allowing a controller of the motorized window treatment to reset during the overload condition;
• recalling the desired position after the overload condition;
• examining the plurality of positions stored in the memory to locate a discontinuity in the plurality of positions;
• determining the present position of the motorized window treatment in response to locating the discontinuity in the plurality of positions;
• and
• automatically driving the motor of the motorized window treatment in response to the desired position and the present position after the desired position has been recalled and the present position of the motorized window treatment has been determined.

A method of controlling a motorized window treatment driven by an electronic drive unit having a motor, a controller, and a memory, the controller operable to determine the rotational position of the motor, the memory having a plurality of memory locations, the method comprising the steps of:

• adjusting a present position of the motorized window treatment in response to the rotational position of the motor;
• storing the value of the present position of the motorized window treatment in one of the memory locations of the memory each time the rotational position of the motor changes by a predetermined angle, such that a plurality of position values are stored in the memory in sequential order;
• locating a discontinuity in the plurality of position values;
• and
• determining the present position of the motorized window treatment in response to locating the discontinuity in the plurality of position values.

A method of controlling a motorized window treatment to a desired position, the motorized window treatment driven by an electronic drive unit having a motor, a controller, and a memory, the controller operable to determine the rotational position of the motor, the method comprising the steps of:

• adjusting a present position of the motorized window treatment in response to the rotational position of the motor;
• storing the desired position in the memory;
• storing the present position of the motorized window treatment in the memory each time the rotational position of the motor has changed by a predetermined angle, such that a plurality of positions are stored in the memory;
• recalling the desired position from the memory when the controller is reset;
• examining the plurality of positions stored in the memory to locate a discontinuity in the plurality of positions;
• and
• determining the present position of the motorized window treatment in response to locating the discontinuity in the plurality of positions;
• and
• automatically driving the motor in response to the desired position and the present position after the desired position has been recalled from the memory and the present position of the motorized window treatment has beed determined.