RU2797066C1 - Device for controlling elevator doorway based on a photo curtain - Google Patents

Abstract

FIELD: elevator equipment.

SUBSTANCE: device for controlling the doorway of elevators based on a photo curtain contains a control unit and two optical sensors. The sensors contain modules of infrared optical transceivers placed on the board with a pitch providing illumination of two receiving elements of one sensor by one transmitting element of the other. The transceiver elements are an infrared LED and a phototransistor, eight pieces, which are controlled by a microcomputer, which turns on the transmitters in turn and interrogates the receivers in accordance with the commands of the control unit, and also transmits information about the signal levels on the receiving elements of the module to the control unit.

EFFECT: accuracy of obstacle detection is increased.

1 cl, 4 dwg

Description

1. Technical field

The invention relates to an automation tool, namely a set of software, hardware and software tools designed to create a method for detecting objects entering and exiting through the doorway of passenger and cargo-passenger elevators, with the subsequent transfer of this information to the control system, in order to ensure the safety of work lift equipment.

2. State of the art

Currently, control systems for the doorway of passenger and passenger-and-freight elevators exist. As examples of such systems are: CN202010674638.9A; CN203079495U; CN203486717U; CN106044503A; CN102530690A.

The above inventions prevent pinching of objects located in the doorway of elevators.

However, the currently existing inventions recognize objects entering and exiting the elevator, usually using a camera or, as a rule, include a separate optical transmitter unit and a separate optical receiver unit, when the optical emission is interrupted by an obstacle, design and circuitry which has significant differences, which, in the event of a partial failure of one of these units (malfunctions of individual receivers and (or) transmitters), leads to the impossibility of reliably determining the presence of an obstacle of a set size, that is, to the inoperability of the device. In addition, for the operation of such a device, it is necessary that the obstacle interrupt the radiation in the vicinity of an imaginary line connecting the transmitter of the optical transmitter unit and the corresponding receiver of the optical receiver unit, which does not make it possible to reliably determine an obstacle with linear dimensions less than the step between the receiving and transmitting elements.

In the presence of spurious illumination of the receiver, the device also turns out to be inoperative (in this case, in the presence of constant spurious illumination, it is necessary to swap the receiver and transmitter).

The main objective of the invention is to eliminate the above disadvantages, namely, the operation of the system is aimed at guaranteed detection of the presence of an obstacle of the stated dimensions, in the presence of illumination of one of the modules of the optical transceivers.

3. Disclosure of the essence of the invention

The control device for the doorway of passenger and passenger-and-freight elevators is shown in Fig. 1, 2 and consists of a control unit (4), two sensors (a device for receiving and transmitting optical radiation, mounted in an aluminum profile housing) (1), including from one to four modules of optical transceivers (3), , on each of which there are transceiver elements - an infrared LED and a phototransistor - in the amount of eight pieces.

The design of the control unit is shown in Fig. 3. Overall dimensions of the control box correspond to the following dimensions: 200*200*50 (W*H*D). The unit of measurement is millimeters.

The control unit (4) generates commands for the sensors (1) to turn on the transmitter and interrogate the receivers for each sensor and sends a signal “OBSTACLES” or “NO OBSTACLES” to adjacent systems. The size of the detected obstacle: 50 mm or more. The obstacle detection height (from the cabin threshold) is from 25 to 1800 mm. The receiver and transmitter provide control of an opening with a width of 600 to 2400 mm.

Each optical module (3) includes a microcomputer, which, by controlling a shift register with serial input and parallel output, sequentially outputs signals to transmitters and, using an analog switch and a built-in analog-to-digital converter, collects signals from optical receivers (2 ).

Microcomputer - is a built-in software for controlling the doorway control device for passenger and passenger-and-freight elevators, which is included in the Register of Computer Programs, registration No. 2022667821 dated 09/21/2022. The certificate confirming the registration of a microcomputer as a computer program is available for review in the relevant state register at: https://fips.ru/EGD/584dd6fe-6603-4016-9a4c-d0c3a4f601cd

A distinctive feature of the invention is that the sensors of the device have the same circuitry and design, as well as the scalability of the device. Optical transceiver modules are connected in series, thereby providing the required height of the control zone. It is possible to use from one to four modules.

The claimed invention allows to achieve the following technical results:

• Reduced power consumption, due to the absence of the need to simultaneously turn on all sources of optical radiation - thanks to the software algorithm used, only one radiation source is used at a time, the power consumption of which is low.

• Diagnostics of transceivers due to illumination of the receiving element by the transmitting one.

• Constant self-calibration of optical radiation receivers allows avoiding false alarms of the device when the general light background changes.

• Interchangeability of sensors (each of them contains receivers and transmitters of optical radiation), so that if one of the sensors fails, the device's operability is automatically restored by replacing the faulty sensor.

4. Brief description of the drawings

Fig.1. General view of the elevator doorway control device based on a photo curtain.

Fig.2. Design of an elevator doorway control device based on a photo curtain.

Fig. 3. The design of the control unit for the elevator doorway device based on a photo curtain.

Fig. 4. Correspondence table of the states of the transmitters of the elevator doorway device based on the photo curtain.

5. Implementation of the invention

The device for controlling the doorway of elevators based on a photo curtain is provided by a control unit and two sensors, the principle of operation of which is based on the interruption of optical radiation by an obstacle, characterized in that the sensors have the same circuitry and design and contain from one to four modules of optical transceivers, on each of which are transceivers containing receiving and transmitting elements of the infrared optical range, placed on the printed circuit board of the modules of optical transceivers with a step that provides illumination of at least two receiving elements of one sensor with one transmitting element of the other, each of which has transceiver elements - an infrared spectrum LED and a phototransistor - in the amount of eight pieces, controlled by a microcomputer, which alternately turns on the transmitters and interrogates the receivers in accordance with the commands of the control unit, as well as transmits information about the signal levels at the receiving elements of the module via a serial single-wire bus to the control unit, which carries out the decision on the presence or absence of an obstacle in the controlled area and the issuance of a signal to external systems based on the results of the algorithm, which provides a guaranteed determination of the presence of an obstacle due to the formation and subsequent analysis of the correspondence between the states of the receivers and transmitters of both sensors, as well as the detection of malfunctions of the receiving and transmitting elements and correct operation of the device, in case of failure of up to two receiving and/or transmitting elements on one or more sensor modules, in the presence of partial or complete parasitic illumination of one of the sensors by external radiation sources.

The operation algorithm of the control unit (Fig. 3) of the device for controlling the doorway of passenger and passenger-and-freight elevators, to ensure control of the doorway of elevators, is as follows:

1. Saving the results of comparison of lookup tables obtained at the previous iteration, or their initialization, if the iteration is the first one.

2. Turn off the transmitters on the sensors.

3. Interrogation of sensor receivers and registration of the backlight value.

4. Switching on the transmitters of Sensor 1 in series, taking data from all receivers of Sensor 2 and forming a table of correspondence between the states of Sensor 2 receivers and Sensor 1 transmitters (Fig. 4). The performance of each transmitter is controlled by the presence of a signal at the output of the corresponding receiver.

5. Sequential connection of Sensor 2 transmitters, data acquisition from all Sensor 1 receivers and formation of a table of correspondence between the states of Sensor 1 receivers and Sensor 2 transmitters. The performance of each transmitter is controlled by the presence of a signal at the output of the corresponding receiver.

6. Making a decision about the malfunction of individual receivers and transmitters based on the results of a comparison of lookup tables.

7. Making a decision about the presence of an obstacle based on the results of a comparison of the correspondence tables, taking into account the possible presence of faulty receivers and transmitters.

The logic for determining malfunctions of receivers and transmitters, false illumination, as well as the presence of obstacles is shown in Fig. 4.

The minimum distance between the sensors is determined by the radiation angle of the transmitter φ (6) and the step between the transceivers of the optical transceiver modules (3) so that the transmitting data element of the models of one sensor illuminates at least two receiving elements of the optical transceiver modules of another sensor (5).

The above method of operation of the invention allows to detect objects with the greatest accuracy, in the range of the device, the size of which should be at least 50 mm.

Claims (1)

The device for controlling the doorway of elevators based on a photo curtain is provided by the presence of a control unit and two sensors, the principle of operation of which is based on the interruption of optical radiation by an obstacle, characterized in that the sensors have the same circuitry and design and contain from one to four modules of optical transceivers, on each of which contains transceivers containing receiving and transmitting elements of the infrared optical range, placed on the printed circuit board of the modules of optical transceivers with a step that provides illumination of at least two receiving elements of one sensor with one transmitting element of the other, each of which has transceiver elements - an infrared spectrum LED and a phototransistor - in the amount of eight pieces, which are controlled by a microcomputer, which alternately turns on the transmitters and interrogates the receivers in accordance with the commands of the control unit, as well as transmits information about the signal levels at the receiving elements of the module via a serial single-wire bus to the control unit, which makes a decision on the presence or absence of an obstacle in the controlled area and issues a signal to external systems based on the results of the algorithm, which ensures a guaranteed determination of the presence of an obstacle due to the formation and subsequent analysis of the correspondence between the states of the receivers and transmitters of both sensors, as well as the detection of malfunctions of the receiving and transmitting elements and the correct operation of the device, in case of failure of up to two receiving and/or transmitting elements on one or more sensor modules, in the presence of partial or complete parasitic illumination of one of the sensors by external radiation sources.

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