JP7684841B2 - Elevator car position monitoring system and car position monitoring method - Google Patents

Description

The present invention relates to an elevator car position monitoring system that monitors the position of a passenger car installed in an elevator, and a car position monitoring method using this car position monitoring system.

In recent years, elevators have been designed to control the position of their cars so that when the car arrives at a landing on each floor of a building, there is no misalignment (step) between the floor of the car and the floor of the landing, in order to ensure barrier-free access and prevent passengers from falling over.

In general, elevator car position control uses a position detection device that is installed on each floor of a building and detects the arrival position of the car. For example, JP 2016-155623 A (Patent Document 1) shows a car position detection device that is installed in an elevator with a car that moves to a landing on each floor and detects the position of the car relative to the landing.

The car position detection device in Patent Document 1 is composed of a magnetized permanent magnet installed at the platform, a magnetic flux density detection unit installed in the car that detects changes in the magnetic flux density of the magnetic field formed by the permanent magnet when the car approaches the platform, and a position identification unit that identifies the position of the car based on the magnetic flux density detected by the magnetic flux density detection unit.

JP 2016-155623 A

It is necessary to monitor elevator operation status and abnormal conditions, and recently, proposals have been made to remotely monitor elevator operation status and abnormal conditions from a central control center.

However, elevators installed in buildings constructed in the past are often used for long periods of time, for example several decades, from when they were installed at the time of construction until they are renovated. Furthermore, old elevators from the past do not have remote monitoring functions, and a new method for detecting the position of the car is required to realize remote monitoring of the car position even in these old elevators.

For this reason, it is conceivable to install a car position detection device such as that described in Patent Document 1 on each floor of a building. However, there is a problem in that the magnetic flux density characteristics vary depending on the installation position of the permanent magnet that constitutes the car position detection device for each floor, magnetization variations, and variations in the distance between the permanent magnet and the magnetic sensor, making it difficult to accurately estimate the amount of position deviation.

Therefore, it is necessary to understand the relationship between the amount of positional deviation of the elevator car (distance of the step) and the magnetic flux density corresponding to this amount of positional deviation, and to estimate the amount of positional deviation of the elevator car from the detected magnetic flux density.

To counter the effects of this fluctuation in magnetic flux density, the car is moved slightly (for example, every few centimeters) to cause a position shift, and information on the position shift and magnetic flux density at this time is obtained, which makes it possible to understand the relationship between the position shift and magnetic flux density and to estimate the exact amount of position shift.

However, the task of acquiring information regarding this positional deviation and magnetic flux density is performed manually by workers on each floor, resulting in a huge amount of labor required for data acquisition, and creating issues such as high labor costs when building a remote monitoring system.

The object of the present invention is to provide an elevator car position monitoring system and a car position monitoring method that can automatically obtain information regarding position deviation and magnetic flux density without manual intervention.

The present invention relates to
The elevator system includes a magnetic sensor installed in the elevator car, a magnetic marker installed on the building side, a distance sensor that measures the vertical distance between the car frame and the car, a data collection unit that stores magnetic flux density information and distance information obtained from the magnetic sensor and the distance sensor, respectively, and a signal processing unit that estimates the amount of vertical positional deviation between the car and the building,
The data collection unit stores magnetic flux density information and distance information measured at any time during a predetermined period during normal operation,
The signal processing unit is characterized in that, when the specified period has ended, it calculates a specified function that represents the relationship between the magnetic flux density information and distance information stored in the data collection unit, and estimates the amount of vertical positional deviation between the car and the building based on new magnetic flux density information obtained from the magnetic sensor and the specified function.

According to the present invention, information regarding positional deviation and magnetic flux density can be obtained automatically without manual intervention, which can significantly reduce the labor costs involved in building a remote monitoring system. Problems, configurations, and effects other than those described above will become clear from the following description of the embodiment of the invention.

FIG. 1 is a diagram showing the configuration of an elevator. This is an explanatory diagram explaining the positional relationship between the elevator car and the elevator hall, and shows the initial state when no passengers are on board. This is an explanatory diagram explaining the positional relationship between the elevator car and the elevator hall, and shows the state when passengers are on board. 1 is a configuration diagram showing a configuration of an elevator car position monitoring system according to an embodiment of the present invention. FIG. 2 is a process flow diagram illustrating a car monitoring method by the elevator car position monitoring system.

The following describes in detail an embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the following embodiment, and the scope of the present invention includes various modifications and applications within the technical concept of the present invention.

The embodiments are merely examples for explaining the present invention, and some parts have been omitted or simplified as appropriate for clarity of explanation. The present invention can also be implemented in various other forms.

An embodiment of the car position monitoring system according to the present invention is combined with an elevator 1 installed in a building as shown in FIG. 1, for example. This elevator 1 is equipped with a car 4 that moves up and down in a hoistway 2 to a landing 3 on each floor of the building, a main rope 5 having one end attached to the car 4, and a counterweight 6 to which the other end of the main rope 5 is attached and which is suspended in the hoistway 2.

The elevator 1 is also provided in a machine room 7 located above the elevator shaft 2, and is equipped with a hoist 8 that drives the car 4 and the counterweight 6, a deflector wheel 9 arranged near the hoist 8, a car operation panel 10 that is provided on the inner wall of the car 4 and controls the operation of the car 4, and a control device 11 that is provided in the machine room 7 and controls the operation of the elevator 1, including the raising and lowering of the car 4.

In this embodiment, the car 4 is provided with a position detection device that detects the position between the floor surface 4A of the car 4 and the floor surface 3A of the platform 3, and a distance sensor that detects the distance between the floor surface of the car frame that supports the car 4 and the floor surface 4A of the car 4. The specific configuration and function of these will be described later.

The hoist 8 has a drive sheave 8A around which the main rope 5 is wound, an electric motor 8B that rotates the drive sheave 8A, and a brake device (not shown) that brakes the rotation of the drive sheave 8A.

The control device 11 is connected to the car operation panel 10 and the electric motor 8B of the hoist 8, and raises and lowers the car 4 relative to the counterweight 6 in response to the operation of the operation panel 10 or the operation of a platform button (not shown) installed at the platform 3.

In an elevator with the above configuration, we will explain the functions of the magnetic sensor and magnetic marker that detect the position of the car 4 in this embodiment, and the distance sensor that detects the positional deviation of the car.

Figure 2A shows the state in which the car 4 has arrived at a specified floor. The car 4 is composed of a car frame 20 and a car body 21 housed inside the car frame 20. The car frame 20 is raised and lowered in the elevator shaft 2 by winding up and lowering the rope 5. A buffer part 22 made of a metal coil spring or the like is disposed between the bottom surface 21F of the car body 21 and the bottom surface 20F of the car frame 20.

As is well known, this buffer section 22 has the function of buffering external shocks and the like for passengers, and is configured to expand and contract according to the load. Therefore, when a passenger boards the car 4, it is compressed, and the car body 21 moves so as to sink relative to the car frame 20, and when the passenger disembarks, it moves back to its original position. In this embodiment, the amount of movement of the car body 21 due to this sinking is regarded as the amount of positional deviation of the car 4.

When viewed in the direction of movement of the car 4 (hereinafter sometimes referred to as the vertical direction), a magnetic sensor 23 is provided on the top surface of the car body 21. This magnetic sensor 23 has the function of detecting the magnetic flux density generated by a magnetic marker (permanent magnet) 25 fixed to the building 24.

A distance sensor 26 is provided on the bottom surface 20F of the car frame 20, and this distance sensor 26 is provided facing the bottom surface 21F of the car body 21 when viewed in the direction of movement of the car 4. The distance sensor 26 has a function of detecting the amount of sinking of the car body 21, in other words, the amount of positional deviation. The distance sensor 26 may be provided on the bottom surface 21F side of the car body 21. The point is that it is sufficient if it can detect the change in the vertical distance between the car body 21 and the car frame 20.

On the other hand, on the side opposite the car 4, there is a landing 27 in the elevator hall, and a hall door 28 is provided at the landing 27. This hall door 28 has the function of opening when the car 4 arrives and closing when the car 4 departs.

A magnetic marker (permanent magnet) 25 is provided on the door frame 29 at the top of the hall door 28, generating a magnetic field. The magnetic flux density of the magnetic field generated by this magnetic marker 25 is detected by a magnetic sensor 23, making it possible to detect the position of the car 4.

Figure 2A shows the initial state when no passengers are on board, with the magnetic marker 25 and magnetic sensor 23 facing each other in the correct position. As can be seen from this, the floor surface 27F of the platform 27 and the floor surface 21F of the car body 21 are adjusted so that there is no positional misalignment (step). And, when the car body 21 moves up and down (sinks), the magnetic sensor 23 also follows with the same amount of up and down movement.

Note that a state without misalignment (step) refers to a state that is acceptable when using an elevator, and there is no problem if the step can be ignored when using the elevator. In this state, the distance between the bottom surface 20F of the car frame 20 and the bottom surface 21F of the car body 21 is in the initial state. This distance is the standard for misalignment (step).

On the other hand, in FIG. 2B, when a passenger is on board and the car body 21 is in a sunk state with the buffer section 22 compressed, it can be considered that a positional deviation (step) has occurred between the floor surface 27F of the landing 27 and the floor surface 21F of the car body 21. The amount of positional deviation at this time can be detected by the distance sensor 26.

The magnetic sensor 23 is permanently attached to the car body 21, so it moves vertically as the car body 21 sinks, and can detect fluctuations in magnetic flux density when a positional discrepancy (step) occurs between the floor surface 27F of the platform 27 and the floor surface 21F of the car body 21.

Therefore, by detecting the distance information of the positional deviation when passengers board on each floor of a building and the magnetic flux density information at that time and correlating this information, it is possible to obtain the correlation function between the positional deviation and the magnetic flux density. Once the correlation function is found, it becomes possible to derive the amount of positional deviation from the new magnetic flux density information using the correlation function.

In this way, position deviation information and magnetic flux density information at that time can be detected automatically while the elevator is in operation without the need for human intervention, resulting in a significant reduction in the labor costs involved in building a remote monitoring system.

Next, the configuration of the remote monitoring system will be explained using FIG. 3. FIG. 3 shows the configuration of a sensor terminal 30 installed in the elevator 4 and a management server 34 connected to this sensor terminal 30.

As described above, the sensor terminal 30 is equipped with a sensor unit 31 including a magnetic sensor 23, a distance sensor 26, and an air pressure sensor (not shown). The output of each sensor is processed by a control unit 32, and the output of the magnetic sensor 23 is generated as magnetic flux density information, the output of the distance sensor 26 is generated as distance information, and the output of the air pressure sensor is generated as air pressure information. The air pressure information of the air pressure sensor is used to determine the arrival floor of the car 4 from the air pressure. This sensor information is sent to a communication unit 33 and then sent to a management server 34 by wire or wirelessly.

The management server 34 includes a data collection unit (DB: database) 35 and a position deviation detection unit (signal processing unit) 38.

The data collection unit 35 includes a communication unit 36 that receives sensor information from the sensor terminal 30, and a data storage unit 37 that classifies the received sensor information by sensor and stores it in chronological order. In the data storage unit 37, magnetic flux density information and distance information are linked to each piece of air pressure information representing a floor. Therefore, it is possible to associate magnetic flux density information and distance information for each floor.

In this way, while the elevator is operating, the data collection unit 35 can automatically acquire magnetic flux density information from the magnetic sensor 23, distance information from the distance sensor 26, and air pressure information from the air pressure sensor.

As explained above, when a passenger is on board, the car body 21 compresses the buffer section 22 and sinks, so it can be considered that a positional deviation (step) has occurred between the floor surface 27F of the platform 27 and the floor surface 21F of the car body 21. In addition, since the magnetic sensor 23 is integrally provided on the car body 21, it moves vertically together with the sinking of the car body 21, and can detect fluctuations in magnetic flux density when a positional deviation (step) has occurred between the floor surface 27F of the platform 27 and the floor surface 21F of the car body 21.

This eliminates the need for workers to manually determine the relationship between the amount of positional deviation and magnetic flux density, as was previously done, allowing for significant reductions in labor costs.

The time period during which magnetic flux density information and distance information is acquired is suitable to be a time period when there are relatively many passengers and the car body 21 sinks significantly, for example, the commuting time. This makes it possible to increase the detection range of position deviations. However, this time period varies depending on the type of building and the type of business of the occupants, so it can be set appropriately. Furthermore, multiple time periods can be set in order to extract a large amount of sinking (sample amount) depending on the number of passengers.

In addition, if the magnetic flux density information and distance information are retrieved when the hall door 28 is opened or closed, rather than retrieved constantly, the computing time of the computer in the management server 34 can be used for other computations, making it possible to make effective use of computer resources.

The above explanation is for the process when the elevator is in operation for a specified period of time. This allows the relationship between the magnetic flux density information and distance information for each floor to be understood, and from this point on, the actual position deviation will be detected.

Next, the position deviation detection unit 38 includes a communication unit 39 that receives data from the data collection unit 35, a floor calculation unit 40 that calculates the arrival floor of the car 4 from the received air pressure information, a correlation function calculation unit 41 that calculates a correlation function from the correlation between the received magnetic flux density information and distance information, and a car position calculation unit 42 that calculates the car position of the car 4 from the calculated correlation function and new magnetic flux density information.

The floor calculation unit 40 determines the arrival floor of the car 4 from the air pressure information, identifies the magnetic flux density information and distance information of this arrival floor, and determines the correlation function between the magnetic flux density information and the distance information. The correlation function is determined by the correlation function calculation unit 41. In addition to this correlation function, it is also possible to determine the relationship between the magnetic flux density information and the distance information using an approximation formula, and furthermore, this correlation function is determined for each floor.

In this embodiment, this is described as a correlation function, but since the relationship between magnetic flux density information and distance information can also be calculated using an approximation formula, it can be considered as a "predetermined function" that represents the relationship between magnetic flux density information and distance information.

Then, as explained above, once the correlation function between the magnetic flux density information and the distance information has been calculated, the car position calculation unit 42 can use the correlation function to calculate distance information, which is the amount of positional deviation, from the magnetic flux density information newly obtained from the magnetic sensor 23. Once the distance information (amount of positional deviation) has been calculated, it is compared with a predetermined threshold value (corresponding to the allowable amount of positional deviation), and if this threshold value is exceeded, an alarm can be issued.

Next, the case where the above-mentioned car position remote monitoring system is constructed in an old-type elevator will be explained with reference to FIG. 4. The process flow shown in FIG. 4 shows the process from constructing the car position remote monitoring system to detecting a position deviation. In this case, it is assumed that the magnetic sensor 23, magnetic marker 25, and distance sensor 26 have not been installed in advance. The process flow explained below is the process flow for a certain floor, and is executed for each floor.

<Step S10>
In step S10, the height (step) between the floor surface 21F of the car body 21 and the floor surface 27F of the landing 27 is set to an allowable height (preferably no step) (state of FIG. 2A). This height means the above-mentioned positional deviation or step. This sets the initial state. Once this initial state is set, the process proceeds to step S11.

<Step S11>
In step S11, a distance sensor 26 is installed to measure the vertical distance between the bottom surface 20F of the car frame 20 and the bottom surface 21F of the car body 21 (state of FIG. 2A). This distance sensor 26 is attached to either the bottom surface 20F of the car frame 20 or the bottom surface 21F of the car body 21. When installation of the distance sensor 26 is completed, the process proceeds to step S12.

<Step S12>
In step S12, the magnetic sensor 23 is installed on the upper surface of the car body 21, and further the magnetic marker 25 is installed at a predetermined position on the building side (the state shown in FIG. 2A). In this embodiment, the magnetic marker 25 is installed in the door frame 29 at the upper part of the hall door 28. The magnetic sensor 23 and the magnetic marker 25 are installed at positions where the magnetic flux density detected by the magnetic sensor 23 is maximized.

In addition, a door magnetic sensor (not shown) is also provided in the hall door 28, and the magnetic marker 25 is also used as a magnetic marker for the magnetic sensor for the hall door 28, which reduces the manufacturing costs of the elevator. The above-described process is performed for each floor. Once the installation of the magnetic marker 25 is complete, the process proceeds to step S13, and from this point on, the elevator is operated normally to acquire data.

<Step S13>
In step S13, during a predetermined period (initialization period), while the elevator is operating normally, magnetic flux density information from the magnetic sensor 23 and distance information from the distance sensor 26 at any time (T) are acquired and stored in the data storage unit (DB) 37 (state in FIG. 2B). During normal operation, passengers board the elevator, so the elevator car body 21 sinks, and the magnetic flux density information and distance information at this time can simulate the relationship when a positional deviation occurs.

As mentioned above, this data is stored for each floor in chronological order and by data type. The floor information, magnetic flux density information, and distance information are linked to each other. Once each piece of information has been saved, the process moves to step S14.

<Step S14>
In step S14, it is determined whether or not a predetermined "predetermined period" has elapsed. If it is determined that the predetermined period has not elapsed, the process returns to step S13 to repeat the same process, and if it is determined that the predetermined period has elapsed, the process proceeds to step S15.

The specified period here can be any length of time, and is set to a period that provides a sufficient number of samples for magnetic flux density information and distance information to establish a sufficient correlation. In particular, elevators are required to undergo regular inspections every three months, so the schedule can be determined based on this.

For example, steps S10 to S12 can be performed in the first month, and steps S13 to S14 can be performed in the remaining two months. Then, from the next regular inspection, actual positional deviation can be monitored from step S15 onwards.

<Step S15>
In step S15, in order to monitor the actual positional deviation, the state shown in FIG. 2A is set and it is checked whether there is any positional deviation between the car and the landing. If there is no positional deviation, the distance information from distance sensor 26 is no longer needed, so it can be removed and reused in another elevator car position monitoring system.

Then, on the condition that there is no positional deviation, a correlation function is calculated that correlates the magnetic flux density information of the magnetic sensor 23 stored in the data storage unit (DB) 37 and the distance information of the distance sensor 26. The correlation function may differ for each floor, so it is calculated for each floor, but this correlation function can be calculated using a well-known method. In this way, the correlation function makes it possible to grasp the relationship between the magnetic flux density information and the distance information based on the positional deviation. Once the correlation function is calculated, the process of step S16 is executed.

<Step S16>
In step S16, the height (step) between the floor surface 21F of the car body 21 and the floor surface 27F of the landing 27 is estimated from the magnetic flux density information of the magnetic sensor 23 newly detected after step S14 and the correlation function calculated in step S15. When this height estimation is completed, the process proceeds to step S17.

<Step S17>
In step S17, it is determined whether the height estimated in step S16 is equal to or greater than a predetermined threshold (height). If it is determined that the height is not equal to or greater than the predetermined threshold, the process returns to step S16 and repeats the same process. If it is determined that the height is equal to or greater than the predetermined threshold, the process proceeds to step S18. In practice, since the configuration is such that almost no positional deviation occurs, steps S16 and S17 are repeatedly executed.

<Step S18>
In step S18, since it is determined that the height estimated in step S17 is equal to or greater than a predetermined threshold (height), an alarm is issued to call attention. When the manager at the management center recognizes this alarm, he or she contacts the elevator management company, etc., and the elevator management company takes measures to deal with the position deviation.

In this way, in this embodiment, distance information due to positional deviation when passengers board at each floor of a building and information on magnetic flux density at this time are detected, and by correlating this information, the relationship between positional deviation and magnetic flux density can be understood. In this way, positional deviation information and magnetic flux density information at this time can be automatically detected while the elevator is in operation without the manual intervention of an operator, which has the effect of significantly reducing the labor costs involved in building a remote monitoring system.

In the above embodiment, the sinking distance of the car is detected using the distance sensor 26, but instead, it is possible to use an existing weight sensor that issues an alarm when it detects an excess weight.

The weight sensor issues an alarm when the weight of the car reaches its upper limit, and this is often based on the distance between the car body 21 and the car frame 20, detected using a distance sensor or strain sensor. Therefore, by sharing the weight sensor that is already installed, it is possible to reduce the cost of the distance sensor 26 itself and the cost of installing it.

In addition, by providing a door magnetic sensor that detects the opening and closing of the hall door 28, it is possible to obtain magnetic flux density information from the magnetic sensor 23 and distance information from the distance sensor 26 in synchronization with the opening and closing of the hall door 28.

By doing this, instead of constantly acquiring magnetic flux density information and distance information, the magnetic flux density information and distance information can be acquired when the hall door 28 is opened or closed, and the calculation time required for the computer of the management server 34 to acquire the information can be used for other calculations, making effective use of computer resources.

As described above, the present invention is characterized by storing magnetic flux density information and distance information measured at any time during a specified period after the vehicle is set in a state in which vertical positional deviation between the vehicle and the building is tolerable, calculating a specified function that represents the relationship between the stored magnetic flux density information and distance information when the specified period ends, and estimating the amount of vertical positional deviation between the vehicle and the building based on new magnetic flux density information obtained from the magnetic sensor and the calculated specified function.

This allows information about positional deviation and magnetic flux density to be obtained automatically, without manual intervention, significantly reducing the labor costs involved in building a remote monitoring system.

The present invention is not limited to the above-mentioned embodiments, but includes various modified examples. The above-mentioned embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.

1...Elevator, 3...Landing, 3A...Floor, 4...Cab, 4A...Floor, 8...Hoist, 8A...Drive sheave, 8B...Electric motor, 11...Control device, 20...Cab frame, 21...Cab body, 22...Buffer, 23...Magnetic sensor, 24...Building, 25...Magnetic marker, 26...Distance sensor, 27...Landing, 28...Hall door, 29...Door frame, 30...Sensor terminal, 31...Sensor unit, 32...Control unit, 33...Communication unit, 34...Management server, 35...Data collection unit, 36...Communication unit, 37...Data collection unit, 38...Position deviation detection unit, 39...Communication unit, 40...Floor calculation unit, 41...Correlation function calculation unit, 32...Cab position calculation unit.

Claims (14)

The elevator system includes a magnetic sensor installed in an elevator car, a magnetic marker installed on the side of a building, a distance sensor that measures the vertical distance between the car frame and the car body, a data collection unit that stores magnetic flux density information and distance information obtained from the magnetic sensor and the distance sensor, respectively, and a signal processing unit that estimates the amount of vertical positional deviation between the car and the building,
The data collection unit stores the magnetic flux density information and the distance information measured at any time during a predetermined period during a normal operating state,
an elevator car position monitoring system, wherein the signal processing unit, when the specified period has ended, calculates a specified function that represents the relationship between the magnetic flux density information stored in the data collection unit and the distance information, and estimates the amount of vertical positional deviation between the car and the building based on new magnetic flux density information obtained from the magnetic sensor and the specified function. In the elevator car position monitoring system according to claim 1,
An elevator car position monitoring system, characterized in that the specified period is a period that is set after a state is reached in which vertical positional deviation between the elevator car and the building is tolerable. 3. The elevator car position monitoring system according to claim 2,
An elevator car position monitoring system, wherein the predetermined function is a correlation function that represents a correlation between the magnetic flux density information and the distance information. 3. The elevator car position monitoring system according to claim 2,
The elevator car position monitoring system is characterized in that the signal processing unit issues an alarm when the estimated position deviation amount exceeds a predetermined threshold. 3. The elevator car position monitoring system according to claim 2,
An elevator car position monitoring system characterized in that the data collection unit and the signal processing unit are provided in a management server, and the magnetic flux density information and the distance information from the magnetic sensor and the distance sensor are sent to the management server wirelessly or via cable. 3. The elevator car position monitoring system according to claim 2,
An elevator car position monitoring system characterized in that a buffer section that expands and contracts due to load is disposed between the bottom surface of the car body and the bottom surface of the car frame, and the distance sensor is attached to the bottom surface of the car body or the bottom surface of the car frame. 7. The elevator car position monitoring system according to claim 6,
An elevator car position monitoring system, characterized in that a weight sensor for measuring the weight of the elevator car body is used instead of the distance sensor. 2. The elevator car position monitoring system according to claim 1,
An elevator car position monitoring system characterized in that the magnetic markers are provided on each floor of the building, and the magnetic flux density information and distance information are measured for each floor and stored in the data collection unit. 9. The elevator car position monitoring system according to claim 8,
An elevator car position monitoring system characterized in that the magnetic flux density information and the distance information are linked to each floor and stored in the data collection unit. 10. The elevator car position monitoring system according to claim 9,
An elevator car position monitoring system characterized in that the car is equipped with an air pressure sensor, the air pressure sensor detects the arrival floor of the car, and the arrival floor, the magnetic flux density information, and the distance information are linked and stored in the data collection unit. 7. The elevator car position monitoring system according to claim 6,
a door magnetic sensor is provided in a hall door of a landing of the building, and the magnetic flux density information and the distance information are measured by the door magnetic sensor at the arbitrary time when the hall door is opened or closed.
An elevator car position monitoring method comprising: a magnetic sensor installed in an elevator car; a magnetic marker installed on the side of a building; a distance sensor that measures the vertical distance between the car frame and the car body; a data collection unit that stores magnetic flux density information and distance information obtained from the magnetic sensor and the distance sensor, respectively; and a signal processing unit that estimates a vertical positional deviation amount between the car and the building,
The magnetic flux density information and the distance information measured at any time during a predetermined period after the vertical positional deviation between the car and the building is set to a tolerable state are stored in the data collection unit,
After the end of a predetermined period of time, a predetermined function representing a relationship between the magnetic flux density information and the distance information stored in the data collection unit is calculated by the signal processing unit;
an elevator car position monitoring method comprising: estimating, after a specified period of time has elapsed, the amount of vertical positional deviation between the car and the building based on new magnetic flux density information obtained from the magnetic sensor and the specified function. The elevator car position monitoring method according to claim 12,
The method for monitoring the position of an elevator car, wherein the distance sensor is removed from the car when the specified period ends. The elevator car position monitoring method according to claim 12,
the predetermined function is calculated by the signal processing unit after the predetermined period has ended and on the condition that the vertical positional deviation between the elevator car and the building is in an acceptable state.

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