Control system for a motor actuated door operating mechanism
First Claim
1. A control system for a door operator, said door operator including an operating mechanism connected to a door and a motor for actuating said operating mechanism for moving said door in either direction between a closed position and an open position, said control system comprising:
- a selectively actuable start switch means;
control circuitry connected to said start switch means and to said motor for selectively controlling energization of said motor for moving said door in either direction from one of said closed and open positions to the other of said positions in response to actuation of said start switch means; and
an encoder driven by said motor during movement of said door;
said control circuitry including circuit means associated with said encoder for detecting the direction of movement of said door as well as increments of travel by said door;
said control circuitry energizing said motor for moving said door in said detected direction from one of said closed and open positions toward the other of said positions;
said control circuitry de-energizing said motor when the sum of said detected increments of travel equals the distance between said closed and open positions.
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Accused Products
Abstract
A system is disclosed for controlling a motor which drives an operating mechanism for moving a door, such as an overhead garage door, in either direction between a closed position and an open position in response to actuation of a start switch. The control system includes an encoder including a rotatable disc driven by the motor and control circuitry including an encoder pulse verification circuit associated with the encoder for detecting the direction of door movement as well as increments of travel by the door when the door is moved by the motor under control of a motor command circuit in response to actuation of the start switch. The start switch and a start circuit cooperate with the motor command circuit for energizing the motor to move the door in one direction, for de-energizing the motor to stop the door at any position, and for re-energizing the motor to reverse the door in response to repeated actuation of the start switch. An up/down counter circuit is responsive to the direction as well as the increments of travel by the door for containing a count representative of the actual position of the door. A programming circuit is included for setting an up limit setpoint which is stored in a latch circuit. A decoder circuit cooperates with the motor command circuit, the up/down counter circuit, the latch circuit, and a comparator circuit for de-energizing the motor when the door reaches the up limit setpoint as the door is opened. The decoder circuit cooperates with the motor command circuit and the up/down counter circuit for de-energizing the motor when the door reaches the threshold as the door is closed. An obstruction detector circuit is responsive to rate of movement of the door for sensing an obstruction. The obstruction detector circuit cooperates with the motor command circuit for de-energizing the motor if an obstruction is sensed as the door is opened and cooperates with the motor command circuit, the up/down counter circuit, and the decoder circuit for reversing the motor if an obstruction is sensed as the door is closed unless the door is a predetermined distance or less above the threshold whereupon reversal of the motor is inhibited and the motor is merely de-energized. A reset circuit is included for resetting the control circuitry so that the initial actuation of the start switch will cause the door to be opened. Other features are also disclosed.
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Citations
30 Claims
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1. A control system for a door operator, said door operator including an operating mechanism connected to a door and a motor for actuating said operating mechanism for moving said door in either direction between a closed position and an open position, said control system comprising:
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a selectively actuable start switch means; control circuitry connected to said start switch means and to said motor for selectively controlling energization of said motor for moving said door in either direction from one of said closed and open positions to the other of said positions in response to actuation of said start switch means; and an encoder driven by said motor during movement of said door; said control circuitry including circuit means associated with said encoder for detecting the direction of movement of said door as well as increments of travel by said door; said control circuitry energizing said motor for moving said door in said detected direction from one of said closed and open positions toward the other of said positions; said control circuitry de-energizing said motor when the sum of said detected increments of travel equals the distance between said closed and open positions.
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2. A control system for a door operator, said door operator including an operating mechanism connected to a door and a motor for actuating said operating mechanism for moving said door in either direction between a closed position and an open position, said control system comprising:
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a selectively actuable start switch means; a motor command circuit connected to said start switch means and to said motor for energizing said motor for moving said door in either direction from one of said closed and open positions toward the other of said positions in response to actuation of said start switch means; a encoder driven by said motor during movement of said door; an encoder pulse verification circuit connected to said encoder for detecting the direction of movement of said door as well as increments of travel by said door; an up/down counter circuit connected to said encoder pulse verification circuit for counting said increments of travel in a first direction during movement of said door from said closed position to said open position and for counting said increments of travel in a second direction during movement of said door from said open position to said closed position; and circuit means connected to said up/down counter circuit and to said motor command circuit for detecting when the count in said up/down counter circuit indicates that said door has been moved from one of said closed and open positions to the other of said positions; said motor command circuit de-energizing said motor in response to detection by said circuit means that said door has been moved from one of said closed and open positions to the other of said positions. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30)
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29. A method for controlling a door operator, said door operator including an operating mechanism connected to a door and a motor for actuating said operating mechanism for moving said door in either direction between a closed position and an open position, said control system comprising:
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actuating a start switch means; controlling energization of the motor for moving the door in either direction from one of the closed and open positions toward the other of position in response to actuation of the start switch means; driving an encoder by means of the motor during movement of the door for detecting the direction of movement of the door as well as increments of travel by the door; energizing the motor for moving the door in the detected direction from one of the closed and open positions toward the other position; and de-energizing the motor when the sum of the detected increments of travel equals the distance between the closed and open positions.
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Specification