JP5380407B2 - Safety elevator - Google Patents

Description

  The present invention relates to an elevator in which a car moves up and down in a hoistway, and is particularly suitable for an elevator equipped with a position sensor that detects the position of the car (landing detection) and the door zone.

  Conventional elevators, for example, install a photoelectric position detection device on the car and detect the position of the car in the hoistway by detecting the plate to be detected corresponding to the floor. To do. And it is used to detect the door zone (the door opening / closing permission area of the car door with respect to the door of the landing) to align the floor of the car and the floor of the landing (landing detection) and prevent the door from opening Has been.

  To prevent malfunction of the photoelectric landing detection switch (position detection device), a landing detection plate (detected plate) is attached to the landing door sill, and light other than the light from the landing detection switch enters. It is known to provide a cover for preventing malfunction, which is described in Patent Document 1.

  In addition, in order to detect that the conducting wire connecting the detection sensor unit and the detection circuit unit has been disconnected, operation plates having different arrangement patterns for each operation position are attached in the ascending / descending direction of the car, and four cars are detected on the car. It is known that a sensor is provided to detect an operation plate, and when a code based on a signal that cannot be normal operation does not match the arrangement pattern, it is determined to be abnormal, for example, described in Patent Document 2.

JP 2004-224529 A JP 2004-142882 A (FIG. 2)

  In the above prior art, the one described in Patent Document 1 simply prevents malfunction due to external light, so that not only the position detection sensor failure itself cannot be detected, but also the detection of the door zone and the small step difference. It is difficult to make multifunctional as a sensor for re-flooring to be corrected, and for that purpose, the number of sensors has to be increased.

  Moreover, in the thing of patent document 2, it does not consider detecting the failure of a detection sensor itself, and when a detection sensor becomes an ON or OFF failure and becomes a pattern which can also be a normal operation, it is judged abnormality. It was something that could not be done. Therefore, in order to further improve safety and reliability, for example, the detection sensor must be duplicated, and the system configuration is complicated.

  The object of the present invention is to solve the above-mentioned problems of the prior art, and in particular, the position detection sensor can detect each floor and a specific position (various limit switches, etc.), and can be multifunctional only by the position detection sensor. At the same time, it is possible to detect a failure of the detection sensor itself and to detect a failure as an elevator system, thereby improving safety and reliability.

  Another object is to simplify the configuration of the elevator system even if it is multifunctional, improved in safety and reliability, and to increase the redundancy of the entire system including false detection.

  The present invention is to achieve at least one of the above objects.

In order to achieve the above object, according to the present invention, in a safety elevator in which the position of a car that moves up and down in a hoistway is detected and operation is controlled based on the detected position, according to the lift position of the car. A position detection sensor that outputs an output pattern by a plurality of outputs, a position database that stores a specific output pattern corresponding to a specific position in the up-and-down direction, and the car reaches the specific position, and the output pattern is the specific output A car position data section that updates and stores current car position information if the pattern matches the pattern, and the specific output pattern is an even number of the plurality of outputs that are turned on, and the specific position And in the meantime, when the output pattern that is ON is an odd number, the position detection sensor determines that it is out of order.

According to the present invention, when the number of output patterns output by the position detection sensor is an odd number, the position detection sensor is determined to be faulty. Therefore, the function capable of identifying each floor and the number of specific positions detected As the elevator system can be multi-functionalized, failure detection can be performed not only at a specific position of the detection plate but also between them, and when the position detection sensor is output, it is possible to immediately determine the failure , making it safer , Reliability can be improved.

1 is a block diagram showing the overall configuration of an embodiment according to the present invention. The perspective view which shows the detail of the boarding point threshold part of one Embodiment by this invention. 1 is a block diagram illustrating a logic unit according to an embodiment. The list figure which shows the relationship between a position detection sensor, an action | operation piece, and a specific output pattern at the time of setting a specific position as a floor in one embodiment. The block diagram which shows the detail of the logic unit of one Embodiment. The state transition diagram which shows the output transition of the position detection sensor in one Embodiment. The figure which shows the relationship between the specific output pattern and transition prediction data in one embodiment. The flowchart which shows the failure detection in one Embodiment. The list figure which shows the relationship between a position detection sensor, an action | operation piece, and a specific output pattern when a specific position is made into a floor in other embodiment. The block diagram which shows the detail of the logic unit of other embodiment. The flowchart which shows the failure detection in other embodiment.

Hereinafter, an embodiment will be described in detail with reference to the drawings.
FIG. 1 is an overall configuration diagram illustrating an elevator system, in which 102 is a landing threshold and 115 is a floor surface. The car 100 moves across a plurality of floors in a hoistway formed in the building, and is connected to a weight 111 via a rope 101. The car 100 is provided with a car-side door 110 that engages and opens and closes the landing-side door 109. The car 100 is moved when the sheave 103 is driven by the electric motor 105. Electric power for driving is supplied to the electric motor 105 by the power converter 107.

  A pulse generator 106 such as an encoder is attached to the electric motor 105, and the system controller 108 counts pulses generated by the rotation of the electric motor 105, so that the speed of the electric motor 105, the moving direction of the hoistway of the car 100, Calculate position, distance traveled, etc.

  The position detection sensor 4 (position detection device) is composed of a plurality of sensors 11a, 11b, 11c, and 11d, and is provided at a predetermined distance on the car 100 side. The outputs 12a, 12b, Reference numerals 12 c and 12 d are connected to the system controller 108 via the logic unit 5. A detected plate 10 is installed on a landing threshold 102 facing the position detection sensor 4 on the landing side, and the position detection sensor 4 detects the detected plate 10 to detect the position of the car 100 in the hoistway. To do. Then, based on the detected result, the positioning of the floor surface of the car 100 and the floor surface 115 of the landing (landing position), the door zone (the door opening / closing permission area of the car side door 110 with respect to the landing side door 109). Detection and operation control are performed.

  As a sensor for detecting the position, it is preferable to use a non-contact type detection sensor such as a photoelectric type, a magnetic type (magnet use, high frequency magnetic field use, etc.), a capacitance type, etc. Reflective photoelectric detection sensor that projects light onto the sensor and detects the reflected light. There is no risk of ropes being caught on the sensor itself or the plate 1 to be detected during an earthquake, etc. It is desirable in that it can be detected. However, since infrared light or the like is used, there is a risk of erroneous detection due to ambient light such as sunlight, dust, or water droplets.

  In particular, when the position detection sensor 4 that detects the door zone is erroneously detected or malfunctioned, the car side door 110 may be erroneously recognized as being openable regardless of the position at which the car door 110 cannot be opened and closed. Despite being in an openable / closable position, it may be recognized that it cannot be opened and closed, and passengers may be trapped.

  FIG. 2 shows the details of the landing sill 102. The sill 102 includes a toe guard 113 that protects the toes and prevents a person from falling into the hoistway, a metal that reflects light, such as iron, and plastic. The detected plate 10 composed of the operating pieces 10a, 10b (not shown in FIG. 2), 10c, 10d is attached. A position detection sensor 4 including sensors 11a, 11b, 11c, and 11d is attached to the car 100 so as to face the operating pieces 10a, 10b, 10c, and 10d. The outputs 12a, 12b, 12c, and 12d of each sensor are input to a logical operation unit 5 that is a logical operation circuit configured by operations of a logic IC or a microcomputer.

  FIG. 2 shows a case where there are four sensors. The detected plate 10 is in a state in which only three operating pieces 10a, 10c, and 10d are provided, and three of the four sensors can be detected (for example, , An output 1 indicating the presence of detection at a position where the operating piece 10a and the sensor 11a face each other, and since 10b is not shown in FIG. 2, there is no working piece 10b facing the sensor 11b, and an output 0) indicating “no detection”. It has become.

  FIG. 3 shows a position detection sensor 4 and a logical operation unit 5. The logical operation unit 5 is composed of two microcomputers, and the output of the position detection sensor 4 is input to each of them. Moreover, a soft error and a hard error are detected by comparing the two microcomputers with each other.

  The logic unit 5 outputs a signal 14 to the system controller 108. The signal 14 includes door zone and sensor failure diagnosis information, floor identification information, and the like. In addition, when it is necessary to stop the elevator due to a sensor failure or reaching a specific position, an output for shutting off the power and stopping the elevator from the logic unit 5, a system controller, An output for notifying that the blocking process has been executed is transmitted to 108. When two microcomputers are used, more complicated processing is possible. However, the present invention is not limited to the form using two microcomputers, and one is a microcomputer and the other is a logic IC or FPGA (in the field). Rewritable (programmable programmable), LSI (semi-custom LSI with logic gates arranged in a grid), or a single microcomputer. If this processing is executed, it is advantageous for high-speed processing with a simpler configuration.

  FIG. 4 shows a configuration of the detection plate 10 (operating pieces 10a, 10b, 10c, 10d) provided on each floor for identifying each floor, 1st to 6th floors. As shown, specific output patterns corresponding to a plurality of specific positions in the ascending / descending direction are output. And the length of the to-be-detected board 10 is taken as the length corresponded to the door zone which shows a door openable / closable area.

  The length of the plate 10 to be detected may be determined by the function executed with the specific output pattern. For example, when executing the function of a final limit switch for detecting the overrun at the terminal floor of the car, the plate 10 to be detected Should be the length from the buffer to the lowest floor.

  In addition to the door zone and final limit switch, the specific position includes a maintenance limit switch that secures a top clearance for maintenance personnel to perform work safely, a direction limit switch that detects when the car has reached the final floor, It is determined as a fixed position required in the hoistway such as a terminal floor forced deceleration switch for causing the car to collide with the buffer below the rated speed when the car becomes overspeed for some reason.

  FIG. 5 is a block diagram of the logical operation unit 5, and the output of the position detection sensor 4 is input to the position determination unit 21. The position determination unit 21 stores the output pattern of the position detection sensor 4 and the position database 23, and corresponds to each floor, and when the car 100 reaches a specific position, information on the specific output pattern required for the output pattern. Compare. As a result, when the output pattern of the position detection sensor 4 matches the specific output pattern stored in the position database 23, the current car position information in the car position data unit 22 is updated and stored. Information for executing the determined function is transmitted to the function execution unit 26.

  If the output pattern of the position detection sensor 4 is not in the position database 23 and does not match any specific output pattern, it is determined that the sensor is faulty, and a signal indicating the fault is transmitted to the function execution unit 26.

  In addition, since the output pattern detected by the position detection sensor 4 is stored in the car position data unit 22 every time it changes, the transition abnormality determination unit 25 changes the output pattern before being updated with the current output pattern, If the transition does not match the transition prediction data stored in the transition database 24, it is determined that the transition is abnormal, and this is transmitted to the function execution unit 26.

  The function execution unit 26 executes a function according to the specific output pattern. In the case of the floor position, the function execution unit 26 transmits a door zone signal to the transmission unit 27 in order to execute the function of the door zone that is a door openable / closable area. The transmission unit 27 is a process for outputting a signal to the outside, and is connected to, for example, an elevator operation control system.

Next, the failure detection and transition abnormality determination unit 25 using the state transition of the output pattern of the position detection sensor 4 will be described in detail.
FIG. 6 is an example in which the specific position is the floor position, and shows a state transition diagram showing the output transition of the position detection sensor 4 in the case of the sixth floor. The state transition of the position detection sensor 4 is repeated with a transition between a state in which the outputs of all the sensors not detected by each sensor are 0 and a state in which a specific floor is detected (specific output pattern). Therefore, since the output pattern suddenly jumps from the first floor to the sixth floor, or after detecting the second floor, the second, third, and fourth floors should be the next output patterns. When a specific output pattern indicating the fifth floor is detected as the output pattern, it can be determined that the transition is abnormal.

  FIG. 7 shows a specific output pattern expected after the second floor is detected. In this case, it is expected that the specific output patterns on the first floor, the second floor, and the third floor are detected as transition prediction data. If a specific output pattern other than is detected, it is determined as a failure. The transition database 24 has transition prediction data for each floor as shown in FIG. 7, and FIG. 8 shows a specific processing flow. In FIG. 8, the detected current and previous specific output patterns are read from the car position data unit 22 and compared with the transition prediction data, and it is determined whether the sensor is normal or failed, and a sensor failure or a failure of the position determination unit 21 is detected. To do.

  According to the above, a plurality of position detection sensors 4 provided on the car side and a detected plate 10 provided on the landing side and having a plurality of operating pieces identify specific positions and floors, It becomes possible to detect a sensor failure or the like.

  Note that the use of a reflective photoelectric sensor is desirable in terms of effective use of space, but the same can be achieved by using a transmissive photoelectric sensor or a magnetic sensor.

FIG. 9 shows another embodiment in which the configuration of the detection plate 10 (operating pieces 10a, 10b, 10c, 10d) provided on each floor is changed. The failure detection of the position detection sensor 4 will be described in detail based on FIG.
As the failure of the individual sensors 11a, 11b, 11c, and 11d constituting the position detection sensor 4, there is a high possibility that an ON failure due to a sensor element failure or an OFF failure due to disconnection or an element failure occurs. Specifically, in the case of an ON failure, 0 output between floors is 1 output, and in the case of an OFF failure, 1 output is supposed to be 1 output on a specific floor.

  In the configuration of FIG. 9, the operating pieces 10a, 10b, 10c, and 10d are provided so that the specific output pattern is output 1 (ON) only in an even number. It can be recognized immediately that the sensor is out of order, that is, the output pattern of the position detection sensor 4. Similarly, when the operating pieces 10a, 10b, 10c, and 10d are provided so that the output 1 (ON) of the specific output pattern is only an odd number, the number of sensors that are turned ON is one of the sensors. It turns out that is out of order.

  Specifically: In the configuration of FIG. 9, when the position detection sensor 4 is normal, the number of sensors that are output 1 (ON) by the specific output pattern is two or four. Between the floors, any position detection sensor 4 outputs 0 (OFF). When at least one of the position detection sensors 4 has an ON failure or an OFF failure, the number of sensors having an output 1 is 1 or 3 depending on the specific output pattern. Also, when one of the position detection sensors 4 fails between the floors, the number of sensors with output 1 (ON) is one. Therefore, any one of the position detection sensors 4 can be detected by setting an output pattern in which an even number of the position detection sensors 4 output 1 (ON) as normal and an output pattern in which an odd number of the output detection signals 1 (ON) as failure. It becomes possible to detect a failure. Since this failure detection method also functions between floors, a failure of the position detection sensor can be immediately determined when the position detection sensor 4 is output.

  The above failure detection means that two or more Hamming distances are taken between two types of output patterns, normal and failure. The Hamming distance represents the number of different characters at corresponding positions between two codes having the same number of data. For example, the Hamming distance between data A of 1100 and data B of 1101 is 1 because only the least significant digit data is different. In the present embodiment, at least one of the position detection sensors 4 has a Hamming distance of 2 or more between the output pattern “the position detection sensor 4 is normal” and the output pattern “the position detection sensor 4 is faulty”. Detect failure. In the present embodiment, as a configuration for detecting a single failure of the position detection sensor 4, the output pattern is divided into an odd number and an even number and the Hamming distance is 2 or more. However, a simultaneous failure of the position detection sensor is detected. In such a case, a configuration in which the Hamming distance is 3 or more may be used.

  In failure detection using state transition, for example, failure detection could only be performed when a specific output pattern was detected on each floor, but if failure detection was performed by limiting the sensor output pattern to even or odd, Since failure detection can be performed, it is possible to detect failure early.

  FIG. 10 is a block diagram of the logical operation unit 5, and a position determination unit 20 is added to FIG. FIG. 11 is a processing flow of the position determination unit 20, which acquires the output of the position detection sensor 4 and detects a sensor failure with a simple logic of whether one output out of the output of the position detection sensor is an odd number. it can. Therefore, if the position determination unit 20 is a logic IC or FPGA, faster failure detection is possible.

  Further, when combined with failure detection using state transition, detection of the detection sensor itself and double check of the system configuration can be performed, so that further improvement in safety and reliability can be achieved.

4 Position Detection Sensor 5 Logic Operation Unit 10 Detected Plates 10a, 10b, 10c, 10d Actuating Pieces 11a, 11b, 11c, 11d Sensor 22 Car Position Data Unit 23 Position Database 24 Transition Database 25 Transition Abnormality Determination Unit 100 Car

Claims (13)

In the safety elevator in which the position of the car that moves up and down in the hoistway is detected and the operation is controlled based on the detected position,
A position detection sensor that outputs an output pattern based on a plurality of outputs according to the lift position of the car;
A position database storing a specific output pattern corresponding to a specific position in the up-down direction;
A car position data unit that updates and stores current car position information when the car reaches the specific position and the output pattern matches the specific output pattern;
With
The specific output pattern is an even number of outputs that are ON among the plurality of outputs, and the position detection sensor is faulty when the output of the output pattern is an odd number between the specific position and between them. A safety elevator characterized by judging . The safety elevator according to claim 1, further comprising a transition database that stores a plurality of the specific output patterns expected after the specific position is detected as transition prediction data corresponding to each specific position, and the car is When the specific position is reached, if the detected current output pattern does not match any of the plurality of transition prediction data corresponding to the previous specific position, the operation is controlled by determining that there is a failure. Safety elevator to do. 3. The safety elevator according to claim 1, wherein the specific position indicates a floor on which the car is landed. 4. 3. The safety elevator according to claim 1, wherein the specific position indicates a final limit switch that detects an overshoot at the terminal floor of the car. 4. The safety elevator according to claim 1 or 2 , wherein the specific position indicates a maintenance limit switch for securing a top clearance. The safety elevator according to claim 1 or 2 , wherein the specific position indicates a direction limit switch for detecting that the car has reached the terminal floor. The safety elevator according to claim 1 or 2 , wherein the specific position indicates a terminal floor forced deceleration switch. 3. The safety elevator according to claim 1, wherein the position detection sensor is a plurality of sensors provided in the car, and a detected plate provided with an operating piece installed on the landing side facing the sensors. A safety elevator that outputs the output pattern by detecting The safety elevator according to claim 1 or 2 , wherein the specific position indicates a floor on which the car is landed, and the position detection sensor is a plurality of sensors provided on the car, and faces the sensor. The output pattern is output by detecting a detection plate provided with an operating piece installed on the landing side, and the length of the operating piece in the ascending / descending direction is a length corresponding to a door zone. Safety elevator to do. The safety elevator according to claim 1 or 2 , wherein the specific position is at least one of each floor and a final limit switch, a maintenance limit switch, a direction limit switch, or a terminal floor forced deceleration switch. elevator. 3. The safety elevator according to claim 1 or 2 , wherein, when the car has reached the specific position, the position detection sensor when the output pattern does not match any of the specific output patterns stored in the position database. A safety elevator characterized by a failure. 3. The safety elevator according to claim 1, wherein the output of the position detection sensor is input to two microcomputers. 3. The safety elevator according to claim 1, wherein an output of the position detection sensor is input to a microcomputer and an FPGA.

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