Car position detection system, method, elevator system and machine-readable storage medium

Abstract

The present application relates to the field of computer technology, and specifically to a car position detection system, method, elevator system and machine-readable storage medium. A car position detection system includes a car, which is installed in an elevator shaft and can move up and down, and also includes: a first code track belt, a second code track belt, a first acquisition device, a second acquisition device and a calibration and output module. In the car position detection system provided by the present invention, by installing a double code track belt in the elevator shaft and detecting the double code track information on the steel belt, absolute position measurement and reading calibration are achieved, and accurate car position information is sent to the elevator control system, which is conducive to the control system to make accurate judgments, thereby improving the safety performance of the elevator. In addition, the structure required to build the detection system is simple, easy to install, and low cost.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and in particular to a car position detection system, a car position detection method, an elevator system and a machine-readable storage medium. Background Art

[0002] At present, the leveling position of elevators is generally determined by rotary encoders and photoelectric detectors. The rotary encoder is used to measure the speed of the traction machine to calculate the travel of the car, and the photoelectric detector is used to determine whether the car is in the leveling door opening area. However, when the elevator suddenly stops or the power is cut off, the car will brake and slide for a distance, which may cause problems such as inaccurate reading / judgment of the elevator position or staggered floors. Therefore, determining the absolute height value of the car and thus determining the accurate car position will help the elevator control system make accurate judgments and ensure the safety performance of the elevator. Summary of the invention

[0003] The purpose of the embodiment of the present application is to provide a car position detection system and method. In this system, absolute position measurement and reading calibration are achieved by installing a dual-channel belt and detecting the dual-channel information on the steel belt, which is beneficial to improving the safety performance of the elevator. In addition, the structure required to build the detection system is simple, easy to install, and low-cost.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a car position detection system, the car is installed in the elevator shaft and can move up and down, the system comprises: a first code track belt, vertically installed in the elevator shaft, the first code track belt is provided with a plurality of openings at equal intervals along the length direction, and the opening range of the first code track belt can cover the up and down movement range of the car; a second code track belt, vertically installed in the elevator shaft, the second code track belt is provided with a plurality of code hole areas along the length direction, the code hole groups opened in the code hole areas are arranged according to specific rules, the code hole groups are used to indicate the absolute height value of the position thereof, and the spacing between adjacent code hole areas is greater than the length of the code hole areas; a first acquisition device, installed on the car and facing the The first code track band is set up, and is used to collect the opening information on the first code track band in real time and count the openings, and calculate the first absolute height value based on the opening count value; the second acquisition device is installed on the car and faces the second code track band, and is used to collect the coded hole group information on the second code track band in real time, and determine the second absolute height value based on the coded hole group information; the calibration and output module is connected to the first acquisition device and the second acquisition device, and is used to: output the first absolute height value as the car height value to the elevator control system; determine whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value; if so, use the second absolute height value to calibrate the opening count value, and update the first absolute height value based on the calibrated opening count value.

[0005] Based on the first aspect, in some embodiments of the present invention, the first code track belt and the second code track belt are arranged in parallel on the same steel belt.

[0006] Based on the first aspect, in some embodiments of the present invention, the first acquisition device includes a plurality of detection probes, which are arranged at equal intervals in the vertical direction, and the interval between two adjacent detection probes is equal to the interval between adjacent openings on the first code track band.

[0007] Based on the first aspect, in some embodiments of the present invention, the coding hole group provided on the second code channel band includes n coding elements arranged at equal intervals, the number of detection probes included in the second acquisition device is not less than n, and the multiple detection probes are arranged at equal intervals in the vertical direction, and the spacing between two adjacent detection probes is equal to the spacing between two adjacent coding elements.

[0008] Based on the first aspect, in some embodiments of the present invention, auxiliary holes are provided between adjacent code hole areas for assisting in determining the moving direction of the car.

[0009] In the second aspect, the present application provides

[0010] A car position detection method is implemented using the above-mentioned car position detection system. The car is installed in an elevator shaft and can move up and down. The method is characterized in that the method includes the following steps: real-time acquisition of opening information on a first code track band and counting of openings, calculating a first absolute height value based on the opening count value, and outputting the first absolute height value as a car height value to the elevator control system; real-time acquisition of coded hole group information on a second code track band, and obtaining a second absolute height value based on the coded hole group information; determining whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value; if so, calibrating the opening count value using the second absolute height value, and updating the first absolute height value based on the calibrated opening count value.

[0011] Based on the second aspect, in some embodiments of the present invention, multiple detection probes are used to collect the opening information on the first code track band in real time and count the openings. The multiple detection probes are arranged at equal intervals in the vertical direction, and the spacing between two adjacent detection probes is equal to the spacing between adjacent openings on the first code track band. The method also includes: comparing whether the counting results of the multiple detection probes are consistent. If inconsistent, using the second absolute height value to calibrate the count value.

[0012] Based on the second aspect, in some embodiments of the present invention, the method further includes: using an n-bit binary array to represent the absolute height value of the position of the coding hole group, and the arrangement position of the coding holes in the coding hole group corresponds to the arrangement position of the number 1 in the n-bit binary array.

[0013] Based on the second aspect, in some embodiments of the present invention, the method further includes: determining the running direction of the car, if the car runs upward / downward, the opening count is positive; if the car runs in the reverse direction, the opening count is negative.

[0014] In a third aspect, the present application provides an elevator system, comprising an elevator control system and the above-mentioned car position detection system, wherein the elevator control system obtains an absolute height value of the elevator from the car position detection system.

[0015] In a fourth aspect, the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configure the processor to execute the above-mentioned car position detection method.

[0016] Through the above technical solution, the present invention has at least the following beneficial effects:

[0017] In the car position detection system provided by the present invention, a double-track belt is installed in the elevator shaft and the double-track information on the steel belt is detected to achieve absolute position measurement and reading calibration, and accurate car position information is sent to the elevator control system, which is conducive to the control system making accurate judgments, thereby improving the safety performance of the elevator. In addition, the structure required to build the detection system is simple, easy to install, and low-cost.

[0018] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0020] Figure 1 A flowchart of counting calibration of a first acquisition device according to an embodiment of the present application is schematically shown;

[0021] Figure 2 The schematic diagram of the planar structure of the first code channel band and the second code channel band according to the embodiment of the present application is schematically shown.

[0022] Description of Reference Numerals

[0023] 1- first code track; 2- second code track. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0027] Example 1

[0028] This embodiment provides a car position detection system, including a car, wherein the car is installed in an elevator shaft and can move up and down, and further includes:

[0029] The first code track 1 and the first acquisition device. The first code track 1 is vertically installed in the elevator shaft and is set close to the inner wall of the elevator shaft. A number of openings are arranged on the first code track 1 at equal intervals along the length direction, for example, Figure 2As shown. The first acquisition device is installed on the car and is arranged facing the first code track belt 1, and is used to collect the opening information on the first code track belt 1 in real time and count the openings, and calculate the first absolute height value based on the opening count value. That is, in this embodiment, the elevator control system mainly relies on the data collected by the first acquisition device as the basis for judging the position of the car. In this embodiment, the number of openings passed by the first acquisition device as the elevator moves up and down is used to calculate the current position of the car. Since the calculation of the position of the car depends on the openings on the first code track belt 1, the range of the openings on the first code track belt 1 must cover the up and down movement range of the car, so as to ensure that the elevator control system can collect the position information of any point in the car (accurate to the distance between adjacent openings), so the first code track belt 1 needs to be arranged from the top of the shaft to the bottom pit.

[0030] In order to facilitate counting and ensure the accuracy of height position calculation, in this embodiment, the longitudinal coordinate axis is established with the moving direction (vertical direction) of the elevator, and the position of the elevator on the first floor is set as the coordinate origin and recorded as 0. It is more convenient to calculate the number of openings based on this. For example, when the elevator goes up, the opening count is positive and increases one by one. If it passes through 1000 openings on the way up, if the spacing between adjacent openings is 5mm, the upward distance of the car is 5000mm, and 5000mm also represents the absolute height of the car. Then, if the car goes down and passes through 200 openings, the opening count is negative at this time, and the absolute height value of the car at this time is equal to the distance of 800 openings.

[0031] The system also includes a second code track belt 2 and a second acquisition device. The second code track belt 2 is vertically installed in the elevator shaft. The second code track belt 2 is provided with a plurality of code hole areas along the length direction. The code hole groups opened in the code hole areas are arranged according to specific rules, and the arrangement of the code hole groups in each code hole area is different. The length of the code hole group (corresponding to the number of coding elements) can be the same or different. If they are different, it is necessary to ensure that the number of detection probes on the second acquisition device is not less than the longest number of codes. For example, if the code hole group contains n coding elements, the number of detection probes m≥n is required, so as to ensure that the second acquisition device can read the code hole group completely. Since the arrangement of any two code hole groups in the code hole area is different, the code hole group can be made to represent a specific value, such as the absolute height value of its location. When the second acquisition device reads the complete code hole group, the second absolute height value of the car at this time can be obtained. Based on this, the first absolute height value calculated based on the opening count can be verified and calibrated.

[0032] Furthermore, during the counting process, the first acquisition device needs to detect the running direction of the elevator in order to determine the positive or negative number of the hole count, and the running direction can be determined directly by detecting the forward and reverse rotation of the traction machine. Auxiliary holes can also be set between adjacent code hole areas on the second code track belt 2. If the m detection probes on the second acquisition device detect the auxiliary holes in a sequence from bottom to top, it means that the elevator is going down at this time. If the auxiliary holes are detected in a sequence from top to bottom, it means that the elevator is going up at this time. In addition, in order to avoid the auxiliary holes being misjudged as the coding holes in the coding hole group, the coding hole group (16-bit code) uses a start segment mark, a middle segment position, and an end segment mark (such as Figure 2 The middle segment position mark is valid only when the start segment mark and the end segment mark are correct.

[0033] Since the distance between adjacent openings on the first code track belt 1 is fixed and the first code track belt 1 is also fixed, if there is an error in the calculated absolute height value, there must be a counting error. For example, when the elevator suddenly loses power, the first acquisition device will stop counting, and the elevator will continue to rise or descend a distance based on inertia, and inaccurate counting is likely to occur at this time. However, there will be no mistakes in obtaining the absolute height value by reading the coded hole group through the second acquisition device, because only when the complete coded hole group is read can the corresponding absolute height value be obtained, and the position of the car must match this value at this time.

[0034] Furthermore, the system also includes a calibration and output module, which is used to obtain a first absolute height value from the first acquisition device; to obtain a second absolute height value from the second acquisition device; to determine whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value (for example, it can be set to a distance of an opening, such as 5mm); if not, the first absolute height value is sent to the elevator control system; if so, the second absolute height value is used to calibrate the opening count value (specifically, the second absolute height value is divided by the distance between adjacent openings to calculate the number of openings), and then the updated first absolute height value is sent to the elevator control system (the first absolute height value is calculated again using the updated number of openings). The above data processing process can be referred to. Figure 1 The calculation flow diagram is shown.

[0035] Furthermore, in order to save materials and ensure that the absolute height values ​​represented by the openings of the first code track belt 1 and the coding hole groups of the second code track belt 2 correspond one to one, in this embodiment, the first code track belt 1 and the second code track belt 2 can be arranged side by side on the same steel belt. Correspondingly, preferably, the first acquisition device and the second acquisition device are also arranged side by side at the same height.

[0036] Example 2

[0037] Specifically, the first acquisition device and the second acquisition device in this embodiment both use infrared detectors. Exemplarily, the first acquisition device and the second acquisition device are built into the same infrared detector. The infrared detector is installed outside the car, and a steel belt guide groove is provided inside the infrared detector. During installation, the steel belt passes through the guide groove of the detector.

[0038] The infrared detector has an infrared emitter and two rows of sensor readers. The infrared emitter is used to emit infrared light onto the steel strip. After passing through the opening of the steel strip, the infrared light is absorbed by the guide groove and no longer reflected. When the infrared light is projected onto the surface of the steel strip, it is reflected back to the detector and received by the photosensitive element. The two rows of photosensitive elements in the infrared detector are used to read the opening information of the steel strip.

[0039] Furthermore, the first column of sensor heads may be composed of multiple photosensitive elements (the first acquisition device may include multiple detection probes), that is, there is an alternative option. If the first acquisition device has only one detection probe, if the only detection probe fails or is damaged, the elevator will not be able to continue to work and requires emergency repair. To avoid the above situation, illustratively, in this embodiment, the first column of sensor heads is composed of two photosensitive elements, and the distance between the two photosensitive elements is equal to the distance between the openings of the first code track belt 1 on the steel belt. The openings of the first code track belt 1 on the steel belt are detected and counted, and the first absolute height value is calculated based on the opening count value. By default, only the calculated value of the first photosensitive element is sent to the elevator control system. If the first photosensitive element fails, the calculated value of the second photosensitive element is sent to the elevator control system. If the difference between the counts of the two photosensitive elements is greater than the set value, the signal processing module will send out a warning signal and need to be recalibrated through the second code channel 2. If one of the photosensitive elements fails, the signal processing module will send out a fault signal and request the elevator control system to stop the elevator for maintenance. If both photosensitive elements fail, the signal processing module will send out an emergency fault signal and require the electronic control system to stop running.

[0040] For example, if an n-bit binary array is used to represent the absolute height value of the position of the coding hole group, the arrangement position of the coding holes in the coding hole group corresponds to the arrangement position of the number 1 in the n-bit binary array. That is, 1 corresponds to the coding hole, and 0 corresponds to the blank, such as Figure 2 As shown, if the 16-bit binary array represents the absolute height value, the number corresponding to the coding hole group on the second code channel band 2 is 1100 01001000 0101.

[0041] Therefore, the counts of the photosensors of the first row of sensor heads can also be calibrated by the following method:

[0042] For example, if the 16-bit coded information of the previous distance is 1100010010000101, the counts of the sensor head in the first column are 5312 and 5312 respectively, and the 16-bit coded information of the elevator going up to the current position is 1100010010010101, and the counts of the sensor head in the first column are 00005512 and 00005526 respectively. According to the 16-bit coded hole spacing of the second code track of the steel strip is 1 meter and the hole spacing of the first code track is 5mm, that is, the first column of sensors scans the first code track with 1 small hole 200 times from the previous 16-bit coded position to the current 16-bit coded position, then the count of the sensor head in the first column should be 00005512, so the count of the sensor head in the first column is corrected to 00005512 and 00005512. It can be seen that the second photosensitive element of the sensor head in the first column is faulty and needs to be replaced in time, while the first photosensitive element is normal.

[0043] From the above, it can be seen that when the n-bit binary array used to represent the absolute height value is long, it means that the code hole area will occupy a larger range to represent an absolute value, and it cannot be encoded continuously, but can only be encoded after a certain distance.

[0044] The second code track belt 2 reader is composed of m photosensitive elements (m≥n) (second acquisition device) and is used to detect the openings of the second code track belt 2 on the steel belt.

[0045] Example 3

[0046] The first acquisition device can calculate the moving speed of the detector by calculating the displacement change per unit time.

[0047] The first acquisition device sends the calculated position information, speed, running direction and fault warning signal to the elevator control system, and the elevator control system controls the elevator operation according to the signal of the infrared detector.

[0048] The elevator control system obtains the position of the car through the position information of the infrared detector. The technician controls the elevator to run to the leveling position of each floor through the elevator control system, and marks the position as the position of the current floor through the elevator control system. After marking the positions of all floors, the elevator control system can obtain the leveling position information of all floors. The elevator controls the elevator to run to the leveling position of the destination floor according to the leveling position information of each floor.

[0049] The elevator control system calculates the upper limit position of the top floor according to the position information of the top floor and the set upper limit displacement offset.

[0050] The elevator control system calculates the lower limit position of the lowest floor according to the position information of the lowest floor and the set lower limit displacement offset.

[0051] When the position information provided by the infrared detector exceeds the upper limit position or the lower limit position, the elevator control system immediately stops the elevator operation.

[0052] When the elevator control system controls the elevator to run, when the speed information provided by the infrared detector exceeds the rated speed of the elevator control system, the elevator control system controls the elevator to slow down; when the speed information provided by the infrared detector exceeds a certain multiple of the rated speed of the elevator control system, the elevator control system controls the elevator to stop running.

[0053] Example 4

[0054] The present embodiment provides a method for detecting the position of a car. The car is installed in an elevator shaft and can move up and down. The method comprises the following steps: installing a first code track belt 1 in the elevator shaft along a vertical direction, wherein the first code track belt 1 is provided with a plurality of openings at equal intervals along a length direction, and the opening range of the first code track belt 1 can cover the up and down movement range of the car; installing a second code track belt 2 in the elevator shaft along a vertical direction, wherein the second code track belt 2 is provided with a plurality of code hole areas along a length direction, and the code hole groups opened in the code hole areas are arranged according to specific rules, and the code hole groups are used to indicate the absolute height value of the position thereof. , the spacing between adjacent code hole areas is greater than the length of the code hole area; the opening information on the first code track band 1 is collected in real time and the openings are counted; the coded hole group information on the second code track band 2 is collected in real time; the first absolute height value is calculated based on the opening count value, and the second absolute height value is obtained based on the coded hole group information; whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value, if not, the first absolute height value is sent to the elevator control system; if so, the opening count value is calibrated using the second absolute height value, and then the updated first absolute height value is sent to the elevator control system.

[0055] A plurality of detection probes are used to respectively collect the hole opening information on the first code track band 1 in real time and count the holes, the plurality of detection probes are arranged at equal intervals in the vertical direction, and the interval between two adjacent detection probes is equal to the interval between adjacent holes on the first code track band 1. The method further includes: comparing whether the counting results of the plurality of detection probes are consistent, and if not, calibrating the count value using the second absolute height value.

[0056] The method further comprises: using an n-bit binary array to represent the absolute height value of the position of the coding hole group, and the arrangement position of the coding holes in the coding hole group corresponds to the arrangement position of the number 1 in the n-bit binary array.

[0057] The method further includes: determining the running direction of the car, if the car runs upward / downward, the opening count is positive; if the car runs in the reverse direction, the opening count is negative.

[0058] The specific implementation scheme has been reflected in the above-mentioned embodiments 1-3, and will not be described in detail here.

[0059] Example 5

[0060] This embodiment provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the car position detection method described in the above-mentioned embodiment 4.

[0061] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0062] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0063] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0066] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0067] Computer readable media include permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A car position detection system, the car is installed in the elevator shaft and can move up and down, characterized in that: The system includes: A first code track belt is vertically installed in the elevator shaft, wherein the first code track belt is provided with a plurality of openings at equal intervals along the length direction, and the opening range of the first code track belt can cover the up and down movement range of the car; The second code track belt is vertically installed in the elevator shaft. The second code track belt is provided with a plurality of code hole areas along the length direction. The code hole groups opened in the code hole areas are arranged according to specific rules. The arrangement of the code hole groups in each code hole area is different. The code hole groups are used to indicate the absolute height value of the position where they are located. The spacing between adjacent code hole areas is greater than the length of the code hole area. A first acquisition device is installed on the car and arranged facing the first code track, and is used to collect the opening information on the first code track in real time and count the openings, and calculate the first absolute height value based on the opening count value; A second acquisition device is installed on the car and arranged facing the second code track band, and is used to collect the coding hole group information on the second code track band in real time, and determine the second absolute height value based on the coding hole group information; The calibration and output module is connected to the first acquisition device and the second acquisition device and is used to: Outputting the first absolute height value as the car height value to the elevator control system; Determine whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value; if so, calibrate the hole count value using the second absolute height value, and update the first absolute height value based on the calibrated hole count value; The coding hole group provided on the second code channel band includes n coding elements arranged at equal intervals, the number of detection probes included in the second acquisition device is not less than n, and the multiple detection probes are arranged at equal intervals in the vertical direction, and the interval between two adjacent detection probes is equal to the interval between two adjacent coding elements; Wherein, auxiliary holes are arranged between adjacent code hole areas, and the second acquisition device is also used to detect the sequence of the auxiliary holes through the detection probe to determine the running direction of the car in real time.

2. The car position detection system according to claim 1, characterized in that: The first code track belt and the second code track belt are arranged in parallel on the same steel belt.

3. The car position detection system according to claim 1, characterized in that: The first acquisition device includes a plurality of detection probes, which are arranged at equal intervals along the vertical direction, and the interval between two adjacent detection probes is equal to the interval between adjacent openings on the first code track.

4. A method for detecting the position of a car, implemented by the car position detection system according to any one of claims 1 to 3, wherein the car is installed in an elevator shaft and can move up and down, characterized in that: The method comprises the following steps: collecting the opening information on the first code track in real time and counting the openings, calculating a first absolute height value based on the opening count value, and outputting the first absolute height value as a car height value to the elevator control system; Collecting the coded hole group information on the second code track band in real time, and acquiring the second absolute height value based on the coded hole group information; Determine whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value; if so, calibrate the hole count value using the second absolute height value, and update the first absolute height value based on the calibrated hole count value; Compare whether the difference between the first absolute height value and the second absolute height value is greater than a threshold value. If not, send the first absolute height value to the elevator control system; if so, use the second absolute height value to calibrate the opening count value, update the first absolute height value based on the calibrated opening count value, and then send the updated first absolute height value to the elevator control system.

5. The method for detecting the car position according to claim 4, characterized in that: The absolute height value of the position where the coding hole group is located is represented by an n-bit binary array, and the arrangement position of the coding holes in the coding hole group corresponds to the arrangement position of the number 1 in the n-bit binary array.

6. An elevator system, characterized in that: It comprises an elevator control system and a car position detection system as described in any one of claims 1 to 3, wherein the elevator control system obtains an absolute height value of the elevator from the car position detection system.

7. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to perform the car position detection method according to claim 4 or 5.

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