elevator system

Abstract

This elevator system comprises, for example, a tape (8), a sensor (11), a correction plate (12), a sensor (13), an operation control unit (25), a setting unit (23), and a calculation unit (24). The setting unit (23) sets a reference correction amount for a reference position code on the basis of the result of detection of the correction plate (12) by the sensor (13) when a car (1) stops at the reference floor under the control of the operation control unit (25). The calculation unit (24) calculates a correction amount for each position code attached to the tape (8), on the basis of the reference correction amount set by the setting unit (23). The operation control unit (25) controls movement of the car (1) on the basis of the position code read by the sensor (11) and the correction amount calculated by the calculation unit (24).

Description

[Technical Field]

[0001] The present disclosure relates to elevator systems. [Background technology]

[0002] Patent Document 1 describes an elevator device. The elevator device described in Patent Document 1 includes a first tape for detecting the position of the car. The first tape is arranged across the top and bottom of the elevator shaft. A reading device is provided in the car for reading the position information attached to the first tape.

[0003] The elevator system described in Patent Document 1 further includes a second tape for detecting the stopping position of the car. The second tape is arranged in accordance with the stopping position of each floor. The stopping position information attached to the second tape is read by the reading device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-66567 Summary of the Invention [Problem to be solved by the invention]

[0005] In the elevator system described in Patent Document 1, the car position is corrected based on the stop position information of the second tape. However, in order to correct the car position, the elevator system requires that the second tape be installed according to the stop position of each floor. This creates a problem of a complex configuration.

[0006] The present disclosure has been made to solve the above-mentioned problems. An object of the present disclosure is to provide an elevator system that can correct the position of a car with a simple configuration. [Means for solving the problem]

[0007] An elevator system according to the present disclosure is an elevator system in which a car travels in a hoistway, stops at a plurality of floors, some of which are set as reference floors. The system includes: a tape provided in the hoistway and bearing a position code over a specific range within which the car can travel; a first sensor provided in the car and reading the position code on the tape; a detectable object provided in the hoistway in accordance with the position of the reference floor; a second sensor provided in the car and detecting the detectable object; an operation control unit that controls the movement of the car; a setting unit that sets a reference correction amount for the reference position code based on the result of the second sensor detecting the detectable object when the car stops at the reference floor under the control of the operation control unit; and a first calculation unit that calculates a correction amount for each position code on the tape based on the reference correction amount set by the setting unit. The operation control unit controls the movement of the car based on the position code read by the first sensor and the correction amount calculated by the first calculation unit. The reference position code is a code that is preset as a code indicating the position of the reference floor among the position codes attached to the tape. [Effects of the Invention]

[0008] The elevator system according to the present disclosure can correct the position of the car with a simple configuration. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an example of an elevator system according to a first embodiment. [Figure 2] 10A and 10B are diagrams for explaining the functions of a correction plate and a sensor. [Figure 3] FIG. 2 is a diagram for explaining the function of a control device. [Figure 4] 3 is a flowchart showing an example of the operation of the elevator system in the first embodiment. [Figure 5] FIG. 10 is a diagram showing a state in which the car has stopped at the reference floor. [Figure 6]FIG. 10 is a diagram showing another state in which the car stops at the reference floor. [Figure 7] FIG. 10 is a diagram showing another state in which the car stops at the reference floor. [Figure 8] FIG. 10 is a diagram for explaining heat transfer in a hoistway. [Figure 9] FIG. 4 is a diagram for explaining the temperature distribution in the elevator shaft. [Figure 10] FIG. 10 is a diagram for explaining the amount of expansion and contraction of the tape. [Figure 11] FIG. 10 is a diagram illustrating an example of a correction function. [Figure 12] FIG. 12 is a diagram showing the difference between the curve shown in FIG. 11 and the straight line representing the correction function. [Figure 13] FIG. 10 is a diagram for explaining another example of a correction function. [Figure 14] FIG. 14 is a diagram showing the difference between the curve shown in FIG. 13 and the straight line representing the correction function. [Figure 15] FIG. 10 is a diagram showing the temperature distribution in a hoistway measured in an actual elevator system. [Figure 16] FIG. 16 is a diagram showing the amount of expansion and contraction of the tape calculated from the temperature distribution shown in FIG. [Figure 17] FIG. 10 is a diagram illustrating an example of a correction function. [Figure 18] FIG. 10 is a diagram illustrating an example of a correction error. [Figure 19] FIG. 10 is a diagram illustrating the relationship between the position detected by the sensor and the maximum absolute value of the correction error. [Figure 20] This is a diagram corresponding to FIG. 13. [Figure 21] This is a diagram corresponding to FIG. 14. [Figure 22] FIG. 10 is a diagram illustrating the relationship between the position detected by the sensor and the maximum absolute value of the correction error. [Figure 23] FIG. 10 is a diagram illustrating the relationship between the position detected by the sensor and the maximum absolute value of the correction error. [Figure 24] This is a diagram corresponding to FIG. 13. [Figure 25] This is a diagram corresponding to FIG. 14. [Figure 26]FIG. 10 is a diagram showing the ratio of correction errors in each building. [Figure 27] FIG. 10 is a diagram illustrating an example of calculation of a correction amount when three reference floors are set. [Figure 28] FIG. 10 is a diagram for explaining a method for calculating a delay time. [Figure 29] FIG. 2 illustrates an example of hardware resources of a control device. [Figure 30] FIG. 10 is a diagram illustrating another example of hardware resources of a control device. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following detailed description will be given with reference to the drawings. Duplicate descriptions will be simplified or omitted as appropriate. In each drawing, the same reference numerals indicate the same or corresponding parts.

[0011] Embodiment 1 FIG. 1 is a diagram showing an example of an elevator system according to a first embodiment. The elevator system shown in FIG. 1 includes a car 1 and a counterweight 2. The car 1 moves up and down in a hoistway 3. The car 1 and the counterweight 2 are suspended from the hoistway 3 by a rope 4. The counterweight 2 moves up and down in the hoistway 3 in the direction opposite to the direction in which the car 1 moves. FIG. 1 shows an example of a 1:1 roping type elevator system.

[0012] The rope 4 is wound around a hoisting machine 5. The hoisting machine 5 drives the car 1. A control device 6 controls the hoisting machine 5. That is, the movement of the car 1 is controlled by the control device 6. FIG. 1 shows an example in which the hoisting machine 5 and the control device 6 are provided in a machine room 7 above the hoistway 3. The hoisting machine 5 and the control device 6 may also be provided in the hoistway 3. The hoisting machine 5 may be provided at the top of the hoistway 3 or in a pit of the hoistway 3.

[0013] A tape 8 is provided in the hoistway 3. The tape 8 is a long, narrow strip-shaped member. The tape 8 is preferably arranged in a straight line across the top and bottom of the hoistway 3. For example, the upper end of the tape 8 is fixed to a support member 9 provided at the top of the hoistway 3. The lower end of the tape 8 is supported by a support device 10 provided in the pit of the hoistway 3. A downward force is applied to the tape 8 by a spring, weight, or the like provided in the support device 10.

[0014] A position code is attached to the tape 8 over a specific range in which the car 1 can move. It is preferable that the position code is attached over the entire range in which the car 1 can move. The position code may be a magnetic code or an optical code. Other types of codes may also be recorded on the tape 8 as the position code.

[0015] A sensor 11 is provided on the car 1 to read the position code attached to the tape 8. The elevator system shown in FIG. 1 does not indirectly detect the position of the car 1 based on a signal from an encoder provided on the hoist 5 or the like, but detects the position of the car 1 by directly reading the position code attached to the tape 8 with the sensor 11. In other words, the elevator system shown in FIG. 1 is equipped with an absolute positioning system. The sensor 11 transmits a signal according to the read position code to the control device 6.

[0016] Table 1 shows an example of table TA stored in memory unit 20 (not shown in Figure 1) of control device 6. Position codes for specific positions within elevator shaft 3 are registered in table TA. As an example, stop position codes are registered in table TA. Car 1 stops at multiple stop floors. The stop position codes are pre-set codes that indicate the positions of each stop floor among the position codes attached to tape 8. In the example shown in table TA, the stop position code indicating the position of the first floor is "5000". The stop position code indicating the position of the top floor is "100000".

[0017] [Table 1]

[0018] Table TA is created by a specialized engineer, for example, when the system is installed. The engineer manually operates the system to position car 1 in accordance with the position of each stopping floor, and registers the position code read by sensor 11 at that time in table TA. Table TA shows an example in which sensor 11 reads position code "5000" when car 1 is positioned in accordance with the position of the first floor during manual operation. The position code indicating the bottom position, which is below the lowest floor, may be calculated from the position code indicating the position of the first floor. As another example, the position code indicating the bottom position may be a fixed value.

[0019] Table TA shows an example in which, during manual operation, sensor 11 reads position code "100000" when car 1 is positioned to align with the position of floor N. The position code indicating the position of the top, which is above the top floor, may be calculated from the position code indicating the position of floor N. As another example, the position code indicating the position of the top may be a fixed value. Note that "car 1 is positioned to align with the position of floor 1" means that the floor of car 1 and the floor of the landing on the first floor are positioned at the same height. An engineer may perform manual operation and update table TA during periodic maintenance.

[0020] A correction plate 12 is provided in the elevator shaft 3. A sensor 13 for detecting the correction plate 12 is provided in the car 1. The correction plate 12 is an example of an object to be detected by the sensor 13. The correction plate 12 is arranged to match the position of a specific reference floor. The reference floor is a part of the stopping floors at which the car 1 stops. For example, the reference floor is one of the stopping floors and is set in advance.

[0021] FIG. 2 is a diagram for explaining the functions of the correction plate 12 and the sensor 13. A plurality of zones are set on the correction plate 12. A zone is an area that the sensor 13 can distinguish and detect. Below, a preferred example will be described in detail in which three zones are set on the correction plate 12: a central zone 12a, a lower zone 12b directly below the central zone 12a, and an upper zone 12c directly above the central zone 12a. The number of zones set on the correction plate 12 may be two. Four or more zones may be set on the correction plate 12.

[0022] The correction plate 12 is positioned so that the sensor 13 detects the central zone 12a when the car 1 is positioned in accordance with the position of the reference floor. Preferably, the correction plate 12 is positioned so that the detection position of the sensor 13 coincides with the center of the central zone 12a when the car 1 is positioned in accordance with the position of the reference floor. The lower zone 12b extends downward in a straight line from the lower end of the central zone 12a. The upper zone 12c extends upward in a straight line from the upper end of the central zone 12a.

[0023] The sensor 13 may be magnetic, optical, or mechanical in type to detect the correction plate 12. The sensor 13 is required to have the function of being able to distinguish between the central zone 12a, the lower zone 12b, and the upper zone 12c.

[0024] To achieve this function, multiple plates for different zones may be provided as the correction plate 12. Each of the multiple plates may be provided with identification information that can be detected by the sensor 13. Instead of providing the identification information, the multiple plates may be arranged with a vertical or horizontal offset. As another example, the sensor 13 may be provided with multiple detection elements arranged vertically.

[0025] The sensor 13 transmits a signal to the control device 6 according to the detected zone.

[0026] Fig. 3 is a diagram for explaining the function of the control device 6. As shown in Fig. 3, the control device 6 further includes a receiving unit 21, a receiving unit 22, a setting unit 23, a calculation unit 24, and an operation control unit 25, in addition to a storage unit 20. The receiving unit 21, the receiving unit 22, the setting unit 23, and the calculation unit 24 may be provided in the system as a device separate from the control device 6, for example, as a safety control device.

[0027] The receiving unit 21 receives a signal from the sensor 11. The receiving unit 22 receives a signal from the sensor 13.

[0028] In the following, a detailed explanation will be given of an example in which table TA is stored in storage unit 20. That is, as shown in table TA, the first floor, which is the lowest stopping floor, is set as the reference floor. The reference position code is a code that is preset as a code indicating the position of the reference floor among the position codes attached to tape 8. In the example shown below, the reference position code is the position code "5000" indicating the position of the first floor.

[0029] The setting unit 23 sets a correction amount for the reference position code. Hereinafter, the correction amount for the reference position code will also be referred to as a reference correction amount. The calculation unit 24 calculates a correction amount for each position code attached to the tape 8 based on the reference correction amount set by the setting unit 23. The operation control unit 25 controls the movement of the car 1 based on the position code read by the sensor 11 and the correction amount calculated by the calculation unit 24. The movement control of the car 1 includes at least speed control or position control of the car 1.

[0030] The operation of this system will be described in detail below with reference to Figures 4 to 7. Figure 4 is a flowchart showing an example of the operation of the elevator system in the first embodiment.

[0031] When a manual operation is performed by an engineer and a table TA is newly created or updated, the reference correction amount is set to 0 (S101).

[0032] As described above, the operation control unit 25 controls the movement of the car 1 based on the position code read by the sensor 11 and the correction amount calculated by the calculation unit 24 (S102). The operation control unit 25 calculates the current position of the car 1 using equation (1). [Current position of car 1] = [APS detected position] + [correction amount] (1) In equation (1), the "APS detected position" is the position indicated by the position code read by the sensor 11. The "correction amount" is the correction amount calculated by the calculation unit 24, and is the correction amount for the position code read by the sensor 11. As an example, the correction amount is calculated from a function f(APS detected position, reference correction amount) of the APS detected position and the reference correction amount.

[0033] If the reference correction amount is 0, the correction amount is 0. In this case, the operation control unit 25 controls the movement of car 1, taking the position indicated by the position code read by sensor 11 as the current position of car 1. For example, if car 1 is to be stopped on the second floor, the operation control unit 25 stops car 1 at the position where sensor 11 reads the position code "9000".

[0034] While the car 1 is being serviced by the operation control unit 25, the control device 6 determines whether or not the correction plate 12 has been detected by the sensor 13 (S103). While the service is being performed, the operation control unit 25 controls the movement of the car 1 based on the position code read by the sensor 11, and causes the car 1 to respond to registered calls. Basically, when the car 1 stops at the reference floor, the correction plate 12 is detected by the sensor 13. Also, when the car 1 passes through the reference floor, the correction plate 12 is detected by the sensor 13. As a result, a Yes determination is made in S103.

[0035] If the result of S103 is Yes, it is determined whether the position code read by the sensor 11 is included in a specific code group CG (S104). The code group CG is set in advance. The code group CG includes multiple position codes that are consecutively arranged vertically. The code group CG also includes a reference position code. As an example, the code group CG includes a position code that exists within the range of "the position indicated by the reference position code ± the determination distance." Regarding the determination distance, it is preferable that the following formula be satisfied when the total length of the correction plate 12 is L0. L0 / 2≦[judgment distance]≦L0

[0036] If the sensor 11 reads a position code that is not included in the code group CG even though the correction plate 12 is detected by the sensor 13, the result of S104 is No. If the result of S104 is No, the operation control unit 25 stops the car 1 at the nearest floor or the destination floor, and then stops service by the car 1 (S106). As a result, the car 1 will no longer respond to calls. In order to stop service in S106, the operation control unit 25 may also interrupt the safety circuit and stop the power supply to the hoisting machine 5.

[0037] If the correction plate 12 is not detected by the sensor 13, a No determination is made in S103. If a No determination is made in S103, it is determined whether or not the position code read by the sensor 11 is included in the code group CG (S105). If a No determination is made in S105, service by car 1 continues, and the process returns to S102.

[0038] If the position code included in the code group CG is read by the sensor 11 even though the correction plate 12 is not detected by the sensor 13, the determination in S105 is Yes. If the determination in S105 is Yes, the operation control unit 25 stops the service by the car 1 in S106.

[0039] S103 to S105 show processing for determining whether a specific stop condition is met. The stop condition is a condition for stopping the service and is set in advance. That is, in the example shown in FIG. 4, the stop condition is met when S104 is judged as No. This shows an example in which the stop condition is met when a signal indicating that the correction plate 12 has been detected is input from the sensor 13, even though the car 1 is located far from the reference floor. Also, in the example shown in FIG. 4, the stop condition is met when S105 is judged as Yes. This shows an example in which the stop condition is met when a signal indicating that the correction plate 12 has been detected is not input from the sensor 13, even though the car 1 is located sufficiently close to the reference floor.

[0040] If the sensor 11 reads the position code included in the code group CG when the correction plate 12 is detected by the sensor 13, a Yes determination is made in S104. If a Yes determination is made in S104, it is determined whether or not car 1 has stopped at the reference floor (S107). If car 1 passes the reference floor, a No determination is made in S107. If a No determination is made in S107, the process returns to S102.

[0041] When car 1 stops at the reference floor, S107 is judged as Yes. For example, if there is no change in the position code read by sensor 11 for a certain period of time, or if there is a change, the amount of change is small, S107 is judged as Yes. If S107 is judged as Yes, processing for setting the reference correction amount is started. Specifically, the setting unit 23 sets the reference correction amount based on the result of detection of the correction plate 12 by the sensor 13 when car 1 stops at the reference floor under the control of the operation control unit 25.

[0042] First, the setting unit 23 identifies the zone detected by the sensor 13 (S108). Next, the setting unit 23 determines whether the identified zone is the central zone 12a (S109).

[0043] As described above, if the reference correction amount is 0, the correction amount is 0. In this case, the operation control unit 25 stops the car 1 at a position where the sensor 11 reads the position code "5000." When the car 1 stops at the reference floor, i.e., the first floor, under the control of the operation control unit 25, the floor of the car 1 and the floor of the first floor landing are not necessarily positioned at exactly the same height. For example, the tape 8 may be stretched due to factors such as temperature changes. In such a case, when the car 1 stops at the first floor under the control of the operation control unit 25, the floor of the car 1 is positioned at a lower position than the floor of the first floor landing. Figure 5 is a diagram showing the state in which the car 1 has stopped at the reference floor. Figure 5 shows the state in which the car 1 is positioned at a position slightly lower than the first floor.

[0044] 5, the setting unit 23 determines in S108 that the sensor 13 has detected the central zone 12a. As a result, a Yes determination is made in S109. If a Yes determination is made in S109, the setting unit 23 does not change the reference correction amount from its current value (S110). In other words, if the sensor 13 has detected the central zone 12a when the car 1 stops at the reference floor under the control of the operation control unit 25, the setting unit 23 does not change the reference correction amount.

[0045] FIG. 6 is a diagram showing another state in which car 1 has stopped at the reference floor. FIG. 6 shows a state in which car 1 is positioned at an even lower position than the state shown in FIG. 5. In the example shown in FIG. 6, the setting unit 23 determines in S108 that the sensor 13 has detected the lower zone 12b. As a result, a determination of No is made in S109. The determination of S111 will be described later. When three zones, namely, the central zone 12a, the lower zone 12b, and the upper zone 12c, are set on the correction plate 12, a determination of Yes is always made in S111. When a determination of No is made in S109, the setting unit 23 resets the reference correction amount (S112).

[0046] For example, when the setting unit 23 determines in S108 that the sensor 13 has detected the lower zone 12b, it changes the reference correction value so that the stopping position of the car 1 at the reference floor is a distance L1 above the current stopping position. The distance L1 is a distance corresponding to the distance between the central zone 12a and the lower zone 12b. As an example, the distance L1 is set to the distance between the center of the central zone 12a and the center of the lower zone 12b.

[0047] FIG. 7 is a diagram showing another state in which car 1 has stopped at the reference floor. FIG. 7 shows a state in which car 1 is positioned higher than the first floor due to shrinkage of tape 8 caused by factors such as temperature change. In the example shown in FIG. 7, the setting unit 23 determines in S108 that the sensor 13 has detected the upper zone 12c. As a result, a determination of No is made in S109. For example, when the setting unit 23 determines in S108 that the sensor 13 has detected the upper zone 12c, it changes the reference correction value so that the stopping position of car 1 at the reference floor is lower by a distance L2 than the current stopping position. The distance L2 is a distance corresponding to the distance between the central zone 12a and the upper zone 12c. As an example, the distance L2 is set to the distance between the center of the central zone 12a and the center of the upper zone 12c. The distance L2 may be the same as or different from the distance L1.

[0048] When the reference correction amount is reset in S112, the calculation unit 24 calculates the correction amount for each position code attached to the tape 8 based on the reset reference correction amount. Since each stop position code is also one of the position codes attached to the tape 8, the calculation unit 24 also calculates the correction amount for each stop position code. As an example, the calculation unit 24 calculates each correction amount so that the correction amount for each position code is proportional to the distance from the top end of the tape 8. Note that the correction amount for the top is 0, and the correction amount for the reference position code is the reference correction amount. Table 2 shows an example in which car 1 stops at the reference floor in the state shown in Figure 6, and the reference correction amount is set to "-100" in position code conversion in S112.

[0049] [Table 2]

[0050] As described above, the operation control unit 25 calculates the current position of car 1 from equation (1). Therefore, when the sensor 11 reads the position code "5000," the operation control unit 25 calculates the current position of car 1 as the position indicated by the position code plus the correction amount "-100," that is, the position indicated by the position code "4900." If car 1 is to be stopped at the first floor, the operation control unit 25 stops car 1 near the position where the sensor 11 reads the position code "5100" so that the position calculated from equation (1) matches the position indicated by the already registered position code "5000."

[0051] In the example shown in this embodiment, the reference correction amount for the reference position code is set by the setting unit 23, and the correction amount for each position code attached to the tape 8 is calculated by the calculation unit 24. Therefore, in order to correct the position of the car 1, it is not necessary to install a correction plate 12 in accordance with the position of each stopping floor. There can be only one reference floor for installing the correction plate 12. Therefore, in the example shown in this embodiment, even if the tape 8 expands or contracts, the position of the car 1 can be corrected with a simple configuration. Furthermore, because it is not necessary to install a correction plate 12 in accordance with the position of each stopping floor, accidents such as the rope 4 getting caught on the correction plate 12 during an earthquake are less likely to occur.

[0052] Other functions that can be adopted by the elevator system are described below. If possible, the elevator system may adopt a combination of the following functions.

[0053] In order to periodically perform the process for setting the reference correction amount, the operation control unit 25 may forcibly stop the car 1 at the reference floor when a certain time has elapsed since the car 1 last stopped at the reference floor. The certain time is set in advance.

[0054] In the present embodiment, an example has been described in which three zones are set on the correction plate 12. As described above, four or more zones may be set on the correction plate 12. For example, when five zones are set on the correction plate 12, in addition to the central zone 12a, the lower zone 12b, and the upper zone 12c, a bottom zone immediately below the lower zone 12b and a top zone immediately above the upper zone 12c are further set on the correction plate 12.

[0055] In such a case, if the determination in S109 of Fig. 4 is No, then in S111 it is determined whether the difference between the detection zones is equal to or less than the allowable value. As an example, if it is determined in S108 that the sensor 13 has detected the lower zone 12b or the upper zone 12c, then the determination in S111 is Yes. If it is determined in S108 that the sensor 13 has detected the lowest zone or the highest zone, then the determination in S111 is No. If the determination in S111 is No, then the operation control unit 25 stops service by car 1 in S106.

[0056] In the present embodiment, an example has been described in which the first floor, which is the lowest floor, is set as the reference floor, but the reference floor does not have to be the lowest floor.

[0057] As a result of research by the applicant, it was found that when only one reference floor is set, it is preferable to set the reference floor to a stopping floor that is in the range of 11 to 17 from the bottom end of tape 8, where the total length of tape 8 is 100, among the stopping floors at which car 1 stops. It was also found that when there is no stopping floor in that range, it is preferable to set the reference floor to a stopping floor that is in the range of 0 to 21 from the bottom end of tape 8. The reasons for this will be explained below with reference to Figures 8 to 26.

[0058] It is preferable that the upper end of the tape 8 is positioned slightly above the position of the top floor, and the lower end is positioned slightly below the position of the bottom floor. Compared to the distance from the top floor to the bottom floor, the distance that the tape 8 protrudes upward from the position of the top floor and the distance that the tape 8 protrudes downward from the position of the bottom floor are extremely small. For this reason, the total length of the tape 8 may be considered the distance from the top floor to the bottom floor. In the explanations regarding Figures 8 to 26, the total length of the tape 8 and the distance from the top floor to the bottom floor are considered to be synonymous.

[0059] FIG. 8 is a diagram for explaining heat transfer in a hoistway 3. As shown in FIG. 8, a building 40 stands on land 41. The hoistway 3 is a vertically extending space formed inside the building 40. The hoistway 3 is formed to extend below the ground level. A tape 8 is hung from the top of the hoistway 3.

[0060] The building 40 is exposed to the outside air. Therefore, the temperature of the portion of the elevator shaft 3 formed inside the building 40 is affected by the temperature of the outside air. On the other hand, the lowest portion of the elevator shaft 3 contacts the land 41. The heat capacity of the land 41 is extremely large compared to the heat capacity of the building 40. Therefore, the temperature of that portion of the elevator shaft 3 is not significantly affected by the temperature of the outside air and is close to the temperature of the land 41. Therefore, a temperature gradient in the height direction of the elevator shaft 3 occurs according to the temperature of the outside air. The tape 8 expands and contracts depending on the temperature. Therefore, when detecting the position of the car 1 based on the position code attached to the tape 8, it is preferable to make a correction that takes into account the expansion and contraction of the tape 8.

[0061] FIG. 9 is a diagram illustrating the temperature distribution in the elevator shaft 3. The vertical axis of FIG. 9 represents the temperature D of the elevator shaft 3. The horizontal axis of FIG. 9 represents the position P in the elevator shaft 3. For position P, the position of the lowest floor is set to 0, and the position of the highest floor is set to 100. Furthermore, when representing position P, normalized numerical values ​​are shown in parentheses. For example, position P[0] is the position of the lowest floor. Position P

[0100] is the position of the top floor. Position P

[30] is the position 30 from the lowest floor, where the position of the lowest floor is set to 0 and the position of the top floor is set to 100. On the horizontal axis of FIG. 9, the position of the top floor is shown on the left, and the position of the lowest floor is shown on the right.

[0062] As shown in FIG. 9, temperature D at position P[0] is the temperature of land 41. On the other hand, because the heat capacity of building 40 is smaller than that of land 41, temperature D monotonically increases or decreases as one approaches the top floor. For example, when the outside air temperature is higher than the temperature of land 41, temperature D increases as one approaches the top floor, as indicated by the solid arrow in FIG. 9. When the outside air temperature is lower than the temperature of land 41, temperature D decreases as one approaches the top floor, as indicated by the dashed-dotted arrow in FIG. 9.

[0063] FIG. 10 is a diagram for explaining the expansion and contraction amount of tape 8. When the temperature D of the elevator shaft 3 changes linearly with respect to the position P as shown in FIG. 9, the expansion and contraction characteristics of tape 8 are as shown in FIG. 10. Specifically, the expansion and contraction amount of tape 8 is 0 at position P

[0100] . When the outside air temperature is higher than the temperature of the ground 41, the expansion and contraction amount of tape 8 increases as the floor approaches the lowest floor, as shown by curve C1 in FIG. 10. Note that curve C1 is an upward convex curve, and the center of curvature is located below curve C1. When the outside air temperature is lower than the temperature of the ground 41, the expansion and contraction amount of tape 8 decreases as the floor approaches the lowest floor, as shown by curve C2 in FIG. 10. Curve C2 is a downward convex curve, and the center of curvature is located above curve C2.

[0064] FIG. 11 is a diagram illustrating an example of a correction function. Curve C1 shown in FIG. 11 is the same as curve C1 shown in FIG. 10. FIG. 11 corresponds to curve C1 shown in FIG. 10 with correction function F1 added. FIG. 11 shows an example in which the amount of expansion and contraction of tape 8 on the lowest floor is detected by a sensor. This sensor corresponds to sensor 13. That is, in the example shown in FIG. 11, the amount of expansion and contraction of tape 8 on the top floor is 0, and the amount of expansion and contraction of tape 8 on the bottom floor is the value detected by the sensor. Correction function F1 is defined as a linear function by the line segment connecting the amount of expansion and contraction on the top floor and the amount of expansion and contraction on the bottom floor, i.e., the value detected by the sensor.

[0065] As can be seen from curve C1, the amount of expansion and contraction of tape 8 is greatest on the lowest floor. Therefore, in the example shown in Figure 11, the amount of expansion and contraction of tape 8 is detected at the position where the amount of expansion and contraction is greatest. Figure 12 is a diagram showing the difference between curve C1 shown in Figure 11 and the straight line representing correction function F1. Hereinafter, this difference will also be referred to as the correction error. In the example shown in Figure 12, the correction error is always a positive value. Furthermore, the correction error on the top floor and the correction error on the bottom floor are 0. The curve representing the correction error is an upward convex curve, and the peak of this mountain is the maximum value of the correction error.

[0066] The correction error is preferably as small as possible because it directly affects the error in the stopping position of car 1. Furthermore, the polarity of the correction error does not need to be constant. Below, we will explain an example in which the maximum value of the correction error is reduced by mixing positive and negative values ​​in the correction error.

[0067] FIG. 13 is a diagram illustrating another example of the correction function. The curve C1 shown in FIG. 13 is the same as the curve C1 shown in FIG. 10. FIG. 13 corresponds to the curve C1 shown in FIG. 10 to which the correction function F2 has been added. FIG. 13 shows an example in which the amount of expansion or contraction of the tape 8 at position P[n] is detected by a sensor. n is greater than 0 and less than 100. For example, n=15. In the example shown in FIG. 13, the amount of expansion or contraction of the tape 8 on the top floor is 0, and the amount of expansion or contraction of the tape 8 at position P[n] is the value detected by the sensor. The correction function F2 is defined as a linear function by the line segment connecting the amount of expansion or contraction on the top floor and the amount of expansion or contraction at position P[n], i.e., the value detected by the sensor.

[0068] FIG. 14 is a diagram showing the difference between the curve C1 shown in FIG. 13 and the straight line representing the correction function F2. In the example shown in FIG. 14, the correction error at position P[n] is 0. The correction error from position P[0] to position P[n] is a negative value. The correction error from position P

[0100] to position P[n] is a positive value. In this way, by positioning the detection position by the sensor above the lowest floor, the maximum absolute value of the correction error can be reduced. It is preferable that the detection position by the sensor is set so that the absolute value of the maximum positive value of the correction error is equal to the absolute value of the maximum negative value (minimum value).

[0069] Next, the results of a survey conducted by the applicant based on data obtained from an actual elevator device will be described.

[0070] Fig. 15 is a diagram showing the temperature distribution in the hoistway 3 measured in an actual elevator system. The horizontal axis of Fig. 15 represents the ratio of the length of the tape 8 from the top floor to the total length of the tape 8. For example, the ratio value at the top floor is 0, and the ratio value at the bottom floor is 100. The notation of the horizontal axis in Fig. 15 is substantially the same as the notation of the horizontal axis in Figs. 9 to 14.

[0071] In Figure 15, the solid line indicates temperature data measured in the summer in an elevator shaft 3 formed in an existing building α. The range in which car 1 can move in building α is just under 200 m. The dashed-dotted line indicates temperature data measured in the summer in an elevator shaft 3 formed in an existing building β. The range in which car 1 can move in building β is just over 200 m. The dashed-double-dotted line indicates temperature data measured in the winter in an elevator shaft 3 formed in an existing building γ. The range in which car 1 can move in building γ is just under 40 m.

[0072] Fig. 16 is a diagram showing the amount of expansion and contraction of the tape 8 calculated from the temperature distribution shown in Fig. 15. Fig. 16 shows the result of calculating the amount of expansion and contraction Δl [m] using equation (2). Δl=l×G×ΔT (2) Here, l is the length of the tape 8, G [1 / K] is the temperature expansion coefficient, and ΔT [K] is the temperature difference. To obtain the results shown in Figure 16, temperature data for the elevator shaft 3 was actually measured at multiple heights, and the temperature at each tape length ratio was calculated using first-order linear interpolation. Furthermore, the temperature difference ΔT was calculated as the difference from 25 degrees Celsius.

[0073] As shown in Figure 15, the temperature at the bottom floor of the elevator shaft 3, i.e., at a tape length ratio of 100%, is approximately room temperature at 19 to 26°C in all buildings. In buildings α and β, the temperature data was collected in the summer, so the temperature of the elevator shaft 3 tends to be higher the closer to the top floor. In building γ, the temperature data was collected in the winter, so the temperature of the elevator shaft 3 tends to be lower the closer to the top floor. Figure 16 shows that the amount of expansion and contraction of the tape 8 increases monotonically in the summer and decreases monotonically in the winter. Furthermore, because the tape 8 expands and contracts depending on the temperature of the elevator shaft 3, it is clear that corrections are required in accordance with this expansion and contraction.

[0074] First, consider the case where the amount of expansion / contraction of the tape 8 on the lowest floor is detected by a sensor. FIG. 17 is a diagram for explaining an example of a correction function. The three curves shown in FIG. 17 are the same as the three curves shown in FIG. 16. FIG. 17 corresponds to the three curves shown in FIG. 16 to which a correction function has been added, as in the example shown in FIG. 11. The correction function Fα is a correction function for the curve indicating the amount of expansion / contraction of the tape 8 attached to building α. The correction function Fβ is a correction function for the curve indicating the amount of expansion / contraction of the tape 8 attached to building β. The correction function Fγ is a correction function for the curve indicating the amount of expansion / contraction of the tape 8 attached to building γ.

[0075] Fig. 18 is a diagram showing an example of a correction error. Fig. 18 corresponds to a correction error calculated based on the example shown in Fig. 17 in the same manner as the example shown in Fig. 12. That is, the solid curve shown in Fig. 18 represents the difference between the solid curve shown in Fig. 17 and the straight line representing the correction function Fα. The dashed-dotted curve shown in Fig. 18 represents the difference between the dashed-dotted curve shown in Fig. 17 and the straight line representing the correction function Fβ. The two-dot-dash curve shown in Fig. 18 represents the difference between the dashed-dotted curve shown in Fig. 17 and the straight line representing the correction function Fγ.

[0076] The solid curve and the dashed-dotted curve shown in Figure 18 are upwardly convex mountain-shaped curves, and the correction error is always a positive value. On the other hand, the two-dot-dash curve shown in Figure 18 is a downwardly convex curve, and the correction error is always a negative value. For this reason, by positioning the sensor detection position above the lowest floor, it is possible to mix positive and negative values ​​in the correction error and reduce the maximum absolute value of the correction error. Below, we will consider the appropriate range of the sensor detection position for each building.

[0077] [Building α] Fig. 19 is a diagram showing the relationship between the detection position by the sensor and the maximum absolute value of the correction error. As shown in Fig. 19, the maximum absolute value of the correction error is smallest when the detection position by the sensor is 13 from the bottom end of tape 8, assuming the total length of tape 8 is 100. This minimum value is reduced to approximately 64% of the maximum value when the detection position by the sensor is on the lowest floor.

[0078] FIG. 20 is a diagram corresponding to FIG. 13. FIG. 21 is a diagram corresponding to FIG. 14. That is, the curve shown in FIG. 20 is the same as the solid curve shown in FIG. 17. FIG. 20 shows an example of a correction function when the sensor detection position is 87% of the tape length ratio. The curve shown in FIG. 21 represents the difference between the curve shown in FIG. 20 and the straight line representing the correction function. As shown in FIG. 21, the polarity of the correction error is reversed at the sensor detection position. Furthermore, the absolute values ​​of the maximum and minimum correction errors are the same.

[0079] [Building β] FIG. 22 is a diagram showing the relationship between the detection position by the sensor and the maximum absolute value of the correction error. FIG. 22 is a diagram corresponding to FIG. 19. As shown in FIG. 22, the maximum absolute value of the correction error is smallest when the detection position by the sensor is 15 from the bottom end of tape 8, assuming the total length of tape 8 to be 100. This minimum value is reduced to approximately 66% compared to the maximum value when the detection position by the sensor is on the lowest floor. For building β, diagrams corresponding to FIG. 20 and FIG. 21 can be similarly obtained.

[0080] [Building γ] Fig. 23 is a diagram showing the relationship between the detection position by the sensor and the maximum absolute value of the correction error. As shown in Fig. 23, the maximum absolute value of the correction error is smallest when the detection position by the sensor is 17 from the bottom end of tape 8, assuming the total length of tape 8 is 100. This minimum value is reduced to approximately 68% of the maximum value when the detection position by the sensor is on the lowest floor.

[0081] FIG. 24 is a diagram equivalent to FIG. 13. FIG. 25 is a diagram equivalent to FIG. 14. That is, the curve shown in FIG. 24 is the same as the two-dot chain curve shown in FIG. 17. FIG. 24 shows an example of a correction function when the sensor detection position is at a tape length ratio of 83%. The curve shown in FIG. 25 represents the difference between the curve shown in FIG. 24 and the straight line representing the correction function. As shown in FIG. 25, the polarity of the correction error is reversed at the sensor detection position. Furthermore, the absolute values ​​of the maximum and minimum correction errors are the same.

[0082] Fig. 26 is a diagram showing the ratio of correction errors in each building. On the vertical axis of Fig. 26, the correction error is set to 100 when the sensor detection position has a tape length ratio of 100%, that is, when the sensor detection position is on the lowest floor. The solid polygonal line shown in Fig. 26 corresponds to the polygonal line shown in Fig. 19. The dashed-dotted polygonal line shown in Fig. 26 corresponds to the polygonal line shown in Fig. 22. The dashed-two-dotted polygonal line shown in Fig. 26 corresponds to the polygonal line shown in Fig. 23.

[0083] As shown in FIG. 26, if the total length of tape 8 is 100 and the position detected by the sensor is in the range of 0 to 21 from the bottom end of tape 8, the correction error will not be larger than the correction error when the position detected by the sensor is the lowest floor. More preferably, if the position detected by the sensor is in the range of 11 to 17 from the bottom end of tape 8, the correction error will be smaller than 80% of the correction error when the position detected by the sensor is the lowest floor. Therefore, it is preferable that the reference floor is a stopping floor that is within the above range. Furthermore, it is preferable that the reference floor is a stopping floor that is within the above range and the calculation unit 24 calculates the correction amount using linear interpolation.

[0084] As another example, multiple stop floors at which the car 1 stops may be set as reference floors. One of the multiple reference floors is preferably set to the lowest stop floor. The remaining multiple reference floors are preferably set to the stop floors closest to the boundaries when the total length of the tape 8 is equally divided by the number of reference floors. In such a case, the setting unit 23 sets a reference correction amount for the reference position code indicating the position of each of the multiple reference floors. The calculation unit 24 calculates a correction amount for each position code attached to the tape 8 based on the multiple reference correction amounts set by the setting unit 23. Figure 27 is a diagram showing an example of calculation of the correction amount when three reference floors are set. When multiple reference floors are set, it is preferable that the calculation unit 24 calculates the correction amount using quadratic function approximation. Note that when multiple reference floors are set, the correction amount may be calculated using linear interpolation.

[0085] As another example, the control device 6 may perform control taking into consideration the delay time of the signal from the sensor 11. In such a case, as shown in FIG. 3, the control device 6 further includes an assigning unit 26 and a calculating unit 27.

[0086] As an example, the signal from the sensor 13 is transmitted to the control device 6 by parallel transmission. On the other hand, the signal from the sensor 11 is transmitted to the control device 6 by serial transmission. For this reason, a communication delay time Δt occurs in the signal from the sensor 11.

[0087] The assigning unit 26 assigns time information to the signal from the sensor 11. The assigning unit 26 assigns time information to the signal from the sensor 13. The signals from the sensors 11 and 13 to which the time information has been assigned by the assigning unit 26 are stored in the storage unit 20 for a certain period of time.

[0088] FIG. 28 is a diagram for explaining a method for calculating the delay time Δt. FIG. 28 shows an example in which car 1 moving downward stops at the reference floor. Sensor 13 detects the edge of correction plate 12 before car 1 stops at the reference floor. When sensor 13 detects the edge of correction plate 12, a signal from sensor 13 is generated. In other words, when sensor 13 detects the edge of correction plate 12, receiving unit 22 receives a signal to that effect. In the example shown in FIG. 28, assigning unit 26 assigns time t1 to the signal from sensor 13 when sensor 13 detects the edge of correction plate 12.

[0089] After the sensor 13 detects the end of the correction plate 12, the car 1 stops at the reference floor. The signal from the sensor 11 is sent to the control device 6 at regular intervals. Therefore, a signal indicating the position code read by the sensor 11 when the car 1 stops at the reference floor is also sent to the control device 6. In the example shown in Figure 28, the assigning unit 26 assigns time t3 to the signal from the sensor 11 when the car 1 stops at the reference floor.

[0090] The calculation unit 27 calculates the delay time Δt of the signal from the sensor 11 based on the times t1 and t3 assigned by the assignment unit 26. First, the calculation unit 27 calculates the entry distance L3 of the car 1. The entry distance L3 is the distance that the car 1 has moved since the sensor 13 detected the edge of the correction plate 12. If the sensor 13 has detected the central zone 12a when the car 1 stops, the calculation unit 27 may calculate the distance from the edge of the correction plate 12 to the center of the central zone 12a as the entry distance L3. The calculation unit 27 estimates the position obtained by subtracting the entry distance L3 from the stopping position of the car 1 based on the signal from the sensor 11 as the position of the edge of the correction plate 12.

[0091] As described above, the signal from the sensor 11 is sent to the control device 6 at a constant cycle. Therefore, the signal from the sensor 11 is not necessarily sent at the same timing as the timing when the car 1 is placed at the estimated position. Therefore, the calculation unit 27 identifies, from among the signals from the sensor 11, a signal that includes a position code indicating a position closest to the estimated position, and identifies the time information assigned to the identified signal. In the example shown in FIG. 28, the calculation unit 27 identifies time t2 as the time information based on time t3 and the entry distance L3. The calculation unit 27 calculates the delay time Δt using the following equation. Δt=t2-t1

[0092] The operation control unit 25 controls the movement of the car 1 based also on the delay time Δt calculated by the calculation unit 27. For example, the movement control of the car 1 includes speed control and position control of the car 1. For example, the current speed and position of the car 1 can be estimated from the following equations. [Speed ​​V]=[Speed ​​V APS ]+[acceleration A APS ] × [delay time Δt] [Position P]=[Position P APS ]+[Correction amount]+([Speed ​​V APS ]+1 / 2×[acceleration A APS ]× [Delay time Δt]) × [Delay time Δt] Here, the velocity V APS is the velocity calculated based on the signal from the sensor 11. APS is the acceleration calculated based on the signal from the sensor 11. APS is the position based on the signal from the sensor 11.

[0093] The operation control section 25 may simply estimate the current speed and position of the car 1 as shown in the following equations. [Speed ​​V]=[Speed ​​V APS ] [Position P]=[Position P APS ]+[Correction amount]+[Speed ​​V APS ] × [delay time Δt]

[0094] In this embodiment, an example has been described in which all processing is completed in one elevator device provided in the elevator system. When the elevator system includes multiple elevator devices, the multiple elevator devices may share necessary information with each other.

[0095] As an example, the above-mentioned elevator apparatus is referred to as elevator apparatus A. In addition to elevator apparatus A, the elevator system further includes elevator apparatus B. Elevator apparatus A and elevator apparatus B belong to the same bank and have similar configurations and functions. However, it is desirable that the reference floor of elevator apparatus B be set to a floor different from the reference floor of elevator apparatus A.

[0096] In the following, in order to distinguish between elevator apparatus A and elevator apparatus B, the description of elevator apparatus A will be accompanied by the letter A, and the description of elevator apparatus B will be accompanied by the letter B. For example, elevator apparatus A is equipped with a control device 6A, and elevator apparatus B is equipped with a control device 6B. A reference floor A is set in elevator apparatus A, and a reference floor B is set in elevator apparatus B. As an example, reference floor B is set to a floor different from reference floor A.

[0097] In this example, the control device 6A further includes a communication unit 28A as shown in FIG. 3. The communication unit 28A has a function of communicating with the control device 6B. Similarly, the control device 6B further includes a communication unit 28B. The communication unit 28B has a function of communicating with the control device 6A. The communication unit 28B transmits the reference correction amount B for the reference position code B, which has been set by the setting unit 23B, to the control device 6A.

[0098] The communication unit 28A acquires the reference correction amount B from the elevator device B. The calculation unit 24A calculates the correction amount for each position code attached to the tape 8 based on not only the reference correction amount A set by the setting unit 23A but also the reference correction amount B acquired by the communication unit 28A. The reference position code B is considered to be a code that is set in advance as a code indicating the position of the reference floor B among the position codes attached to the tape 8A. In this example, the calculation unit 24A can calculate the correction amount in the same way as when multiple reference floors A are set.

[0099] If an elevator system includes three elevator devices, it is possible to calculate the correction amount as shown in FIG. 27 even if only one reference floor is set in each elevator device.

[0100] Furthermore, under normal circumstances, all processing may be completed in one elevator device, and necessary information may be acquired from another elevator device when, for example, sensor 13 fails. For example, if sensor 13A is functioning normally, calculation unit 24A calculates the correction amount based on reference correction amount A set by setting unit 23A. If sensor 13A fails, calculation unit 24A may calculate the correction amount based on reference correction amount B acquired by communication unit 28A.

[0101] As another example, only some of the elevator apparatuses among multiple elevator apparatuses belonging to the same bank may be equipped with the correction plate 12 and the sensor 13. In an elevator apparatus equipped with the correction plate 12 and the sensor 13, a reference correction amount for the reference position code is set based on the result of detection of the correction plate 12 by the sensor 13, and the correction amount is calculated. In an elevator apparatus not equipped with the correction plate 12 and the sensor 13, the control device 6 acquires information on the reference position code and the reference correction amount for the reference position code from an elevator apparatus equipped with the correction plate 12 and the sensor 13, and calculates the correction amount.

[0102] 29 is a diagram showing an example of hardware resources of the control device 6. The control device 6 includes, as hardware resources, a processing circuit 30 including a processor 31 and a memory 32. The processing circuit 30 may include multiple processors 31. The processing circuit 30 may include multiple memories 32.

[0103] In this embodiment, the units denoted by the reference numerals 20 to 28 represent functions possessed by the control device 6. The function of the storage unit 20 is realized by a memory 32. The functions of the units denoted by the reference numerals 21 to 28 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in the memory 32. The control device 6 realizes the functions of the units denoted by the reference numerals 21 to 28 by executing the program stored in the memory 32 using a processor 31 (computer).

[0104] The processor 31 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 32 may be a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD. Usable semiconductor memories include RAM, ROM, flash memory, EPROM, and EEPROM.

[0105] Fig. 30 is a diagram showing another example of hardware resources of the control device 6. In the example shown in Fig. 30, the control device 6 includes a processing circuit 30 including a processor 31, a memory 32, and dedicated hardware 33. Fig. 30 shows an example in which some of the functions of the control device 6 are realized by the dedicated hardware 33. All of the functions of the control device 6 may also be realized by the dedicated hardware 33. The dedicated hardware 33 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. [Industrial Applicability]

[0106] The elevator system according to the present disclosure can be applied to an elevator system equipped with an absolute positioning system. [Explanation of symbols]

[0107] 1 car, 2 counterweight, 3 elevator shaft, 4 rope, 5 hoist, 6 control device, 7 machine room, 8 tape, 9 support member, 10 support device, 11 sensor, 12 correction plate, 12a central zone, 12b lower zone, 12c upper zone, 13 sensor, 20 memory unit, 21 receiving unit, 22 receiving unit, 23 setting unit, 24 calculation unit, 25 operation control unit, 26 granting unit, 27 calculation unit, 28 communication unit, 30 processing circuit, 31 processor, 32 memory, 33 dedicated hardware, 40 building, 41 land

Claims

1. An elevator system in which a car moves through a hoistway, the car stops at a plurality of stopping floors, and some of the stopping floors are set as reference floors, a tape provided in the hoistway and having a location code over a specific range over which the car can travel; a first sensor provided in the car for reading the position code attached to the tape; A detection object provided in the elevator shaft in accordance with the position of the reference floor; a second sensor provided in the car for detecting the object to be detected; an operation control unit that controls the movement of the car; a setting unit that sets a reference correction amount for a reference position code based on a result of the second sensor detecting the object when the car stops at the reference floor under control of the operation control unit; and a first calculation unit that calculates a correction amount for each position code attached to the tape based on the reference correction amount set by the setting unit; Equipped with the operation control unit controls movement of the car based on the position code read by the first sensor and the correction amount calculated by the first calculation unit, An elevator system in which the reference position code is a code that is preset among the position codes attached to the tape as a code indicating the position of the reference floor.

2. a first zone, a second zone directly below the first zone, and a third zone directly above the first zone are set in the detection object; When the car stops at the reference floor, the setting unit When the second sensor detects the first zone, the reference correction amount is not changed, When the second sensor detects the second zone, the reference correction amount is set so that the stop position of the car at the reference floor is a first distance above the current stop position; When the second sensor detects the third zone, the reference correction amount is set so that the stop position of the car at the reference floor is lower than the current stop position by a second distance; the first distance is a distance corresponding to the distance between the first zone and the second zone, 2. The elevator system according to claim 1, wherein the second distance is a distance corresponding to a distance between the first zone and the third zone.

3. A code group including multiple vertically consecutive position codes is preset, the code group includes the reference position code, The operation control unit stops the service by the car when a specific stop condition is met, The stopping condition is: The condition is met when the first sensor reads a position code that is not included in the code group even though the object to be detected is detected by the second sensor, 3. The elevator system according to claim 1, wherein the condition is met when a position code included in the code group is read by the first sensor even though the object to be detected is not detected by the second sensor.

4. 4. The elevator system according to claim 1, wherein the operation control unit stops the car at the reference floor when a predetermined time has elapsed since the car last stopped at the reference floor.

5. an assigning unit that assigns time information to the signal from the first sensor and the signal from the second sensor; a second calculation unit that calculates a delay time of the signal from the first sensor based on time information assigned to the signal from the second sensor when the second sensor detects the end of the detection object and time information assigned to the signal from the first sensor when the car stops at the reference floor; Further provided with 5. The elevator system according to claim 1, wherein the operation control unit controls the movement of the car based also on the delay time calculated by the second calculation unit.

6. The reference floor is a stopping floor that is present within a range of 11 to 17 from the bottom end of the tape when the total length of the tape is 100, among the plurality of stopping floors, The elevator system according to claim 1 , wherein the first calculation unit calculates the correction amount using linear interpolation.

7. A plurality of the reference floors are set, The plurality of reference floors are the lowest stopping floor and the stopping floors that are closest to the positions of the boundaries when the total length of the tape is equally divided by the number of the reference floors, The setting unit sets a reference correction amount for a reference position code indicating each position of the plurality of reference floors, 6. The elevator system according to claim 1, wherein the first calculation unit calculates the correction amount based on a plurality of the reference correction amounts set by the setting unit.

8. a communication unit for acquiring a second reference correction amount for the second reference position code from another elevator device in the same bank, The second reference position code is a code that is preset as a code indicating the position of a second reference floor among the position codes attached to the tape, 8. The elevator system according to claim 1, wherein the first calculation unit calculates the correction amount based on the reference correction amount set by the setting unit and the second reference correction amount acquired by the communication unit.

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