Opening/closing control device

An opening/closing control device that controls an opening/closing operation of an opening/closing body by driving a motor, the device comprising:

• a processor and a memory having program code stored therein, wherein when the processor executes the program code, the processor is configured into:
• a trap detecting unit configured to detect a trap of an object, the trap being caused by the opening/closing body;
• a rotation amount detecting unit configured to detect an amount of rotation of the motor;
• a voltage detecting unit configured to detect a voltage to be supplied to the motor;
• a position detecting unit configured to detect a position of the opening/closing body with respect to the position of the opening/closing body with the opening/closing body in a fully closed state, according to a change in a detected amount of rotation from a reference amount of rotation, the reference amount of rotation being the amount of rotation detected by the rotation amount detecting unit in the fully closed state;
• a motor control unit configured to perform trap prevention control when the trap detecting unit detects the trap, a rotation of the motor being reversed in the trap prevention control, if the position, detected by the position detecting unit, of the opening/closing body is more distant from the position of the opening/closing body in the fully closed state than a preset boundary position is, and to disable the trap prevention control if the detected position of the opening/closing body is closer to the position of the opening/closing body in the fully closed state than the boundary position is;
• and
• a boundary position setting unit configured to set the boundary position;
• wherein
• the boundary position setting unit sets the boundary position according to a sum of:
• a first amount of rotation having a value depending on a change in the voltage detected by the voltage detecting unit from a reference voltage, the reference voltage being a voltage detected by the voltage detecting unit in the fully closed state, the first amount of rotation approximating a change in the reference amount of rotation, the change corresponding to the change in the detected voltage from the reference voltage, and
• a second amount of rotation having a value depending on the detected voltage, the second amount of rotation being smaller than a difference between the reference amount of rotation and a specific amount of rotation at a stop, the specific amount of rotation being the detected amount of rotation at a position, the opening/closing body being stopped at the position by the trap prevention control because the trap of the object with a predetermined thickness has been detected, and being larger than an amount of variations in the reference amount of rotation.