Automatic door control system
First Claim
1. An automatic sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor, said system comprising:
- sliding door means movable between closed and opened positions;
motor means to produce bidirectional multispeed rotary drive for drivably moving said sliding door means;
motor control means to control the direction and speed of said motor means and produce dynamic braking therein comprising circuitry including a pulse width modulator to control the speed of the motor means and a braking resistor for effecting dynamic braking of the motor meansposition means responsive to the rotary drive of the motor means to translate the rotary drive into a linear position scale and determine the direction of movement of the rotary drive and to produce position signals indicative thereof;
sensor means to detect an activating event and produce an operate signal indicative thereof; and
motion control means responsive to said position signals and operate signal to sequentially control and pace the operation of the motor means, said motion control means transmitting direction and speed signals to said motor control means.
1 Assignment
0 Petitions
Accused Products
Abstract
An automatic control system for controlling the operation of a sliding door system employs an electric motor for driving the sliding door system. An encoder is mounted to the shaft of the motor for generating signals which are decoded to detect the operational position of the sliding door system. A clock paced sequential logic circuit produces speed and directions signals in accordance with the detected operational position to control the speed and direction of the electric motor. Means are provided for recording the last stop position and slowing the sliding door system prior to reaching the last stop position. Safety means are provided to de-energize the motor in the event of malfunction of the motor speed control. The system also includes a reduced opening stop feature and a means for automatically establishing a sliding door reference position.
-
Citations
22 Claims
-
1. An automatic sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor, said system comprising:
-
sliding door means movable between closed and opened positions; motor means to produce bidirectional multispeed rotary drive for drivably moving said sliding door means; motor control means to control the direction and speed of said motor means and produce dynamic braking therein comprising circuitry including a pulse width modulator to control the speed of the motor means and a braking resistor for effecting dynamic braking of the motor means position means responsive to the rotary drive of the motor means to translate the rotary drive into a linear position scale and determine the direction of movement of the rotary drive and to produce position signals indicative thereof; sensor means to detect an activating event and produce an operate signal indicative thereof; and motion control means responsive to said position signals and operate signal to sequentially control and pace the operation of the motor means, said motion control means transmitting direction and speed signals to said motor control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An automatic sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor, said sliding door system comprising:
-
sliding door means movable between closed and opened positions; motor means to produce bidirectional multispeed rotary drive for driving the sliding door means in opening and closing directions including a drive shaft mounting an encoder means to generate a train of signals upon rotary motion of the drive shaft; motor control means to control the direction and speed of said motor means; sensor means to detect an activating event and produce an OP signal indicative thereof; position means responsive to said train of signals to generate an OCK signal indicative that the door means is opening in an opening check zone, a CCK signal indicative that the door means is closing in a closing check zone, a CP signal indicative that the door means is in a closed position, and a RATE signal indicative of the speed of the drive shaft; motion control means responsive to said OP, OCK, CCK, CP, and RATE signals to sequentially control and pace the operation of the motor control means, said motion control means selectively transmitting direction and speed signals to said motor control means; and reference means to automatically establish a reference open position for said door means, said opening check zone, said closing check zone, and said closed position being defined in relation to said reference open position. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. An automatic sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor, said sliding door system comprising:
-
sliding door means linearly movable between opened and closed positions; motor means to produce bidirectional multispeed rotary drive for driving said sliding door means; motor control means to control the direction and speed of the motor means; encoder means to generate a pair of signal trains in accordance with the rotary drive of the motor means; decoder means to produce position signals, direction signals and speed signals indicative of the operation of the sliding door means by decoding said signal trains; motion control means to provide speed control and direction control signals to the motor control means in response to said position, direction, and speed signals so that said sliding door means is driven by said motor means in a closing direction at a selected speed in accordance with the linear position of the sliding door means and is driven in the opening direction at a selected speed in accordance with the linear position of the sliding door means, said motion control means comprising reference means to automatically establish a reference position for said sliding door means with the linear position of the sliding door means being defined in relation to said reference position. - View Dependent Claims (17, 18, 19)
-
-
20. A method for automatically controlling the operation of a sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor comprising:
-
(a) driving a sliding door system by means of the rotary drive of a multispeed bidirectional motor; (b) generating position pulses in accordance with the rotary drive of the motor; (c) decoding the position pulses to produce operational position signals indicative of the position and direction of movement movement of said sliding door system; (d) processing said operational position signals to produce corresponding motor speed and motor direction signals; (e) controlling the speed and direction of said motor in accordance with the motor speed and motor direction signals; and (f) automatically recording the last stop position of the sliding door system and slowing the sliding door system prior to reaching the last stop position.
-
-
21. The method of claim 21 further comprising:
(g) automatically de-energizing the motor in the event of a malfunction in the process of controlling the speed of the motor. - View Dependent Claims (22)
Specification