JPWO2018016033A1 - Elevator control device and control method - Google Patents

Abstract

The present invention provides a floor position detector that detects a floor position by detecting a floor plate provided at a floor position in a hoistway with a floor plate detector provided in the car, and a governor rope or a main rope. A car movement distance detection unit that detects a movement distance of the car based on the movement; a drive control unit that performs a floor height learning operation on the car during floor height learning; and the floor detected during the floor height learning operation. A measurement processing unit that measures a floor height based on a position and a moving distance of the car, and a storage unit that stores the measured floor height, wherein the drive control unit is at least the lowest floor during the floor height learning operation. It exists in the control apparatus of an elevator etc. which let the said cage | basket | car pass the said landing plate at a fixed speed.

Description

  The present invention relates to an elevator control device and control method, and more particularly to more accurate measurement of floor height between floors.

In a conventional rope type elevator, a position detecting means for detecting the position of a car based on a landing plate provided at a position corresponding to a stop floor of a car in a hoistway and a rope provided in a governor or a hoisting machine In addition to the information obtained from the above, the floor height information is used to calculate the remaining distance to the stop floor and to control the landing of the car.
Accurate floor height information is required to achieve highly accurate landing. Therefore, the floor height is learned using the information obtained from the landing plate and the position detection means (see, for example, Patent Documents 1-3 below).

JP-A-60-197572 (FIG. 1) JP-A-2-106574 International Publication No. 2006-063379 Pamphlet

  However, with the conventional technology, the floor height measurement data on the final floor, especially the lowest floor where the rope is long, includes measurement errors due to rope expansion and contraction caused by the acceleration / deceleration of the car. It becomes difficult to obtain.

  The present invention has been made to solve the above-described problem, and when performing floor height learning using a governor rope or a main rope, the effect of rope expansion and contraction due to acceleration / deceleration is eliminated, and an accurate floor height is learned. It is an object of the present invention to provide an elevator control device and a control method that can be used.

  The present invention provides a floor position detector that detects a floor position by detecting a floor plate provided at a floor position in a hoistway with a floor plate detector provided in the car, and a governor rope or a main rope. A car movement distance detection unit that detects a movement distance of the car based on the movement; a drive control unit that performs a floor height learning operation on the car during floor height learning; and the floor detected during the floor height learning operation. A measurement processing unit that measures a floor height based on a position and a moving distance of the car, and a storage unit that stores the measured floor height, wherein the drive control unit is at least the lowest floor during the floor height learning operation. It exists in the control apparatus of an elevator etc. which let the said cage | basket | car pass the said landing plate at a fixed speed.

  According to the present invention, the floor height can be learned without being affected by the expansion and contraction of the rope by controlling the car to pass through the landing floor of the terminal floor, particularly the lowest floor, at a constant speed.

1 is a diagram schematically showing an overall configuration of an elevator control apparatus according to Embodiment 1 of the present invention. FIG. It is a figure for demonstrating the car running control at the time of floor height learning by control of the control processing apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the car running control for the floor height measurement of the lowest floor at the time of floor height learning by control of the control processing apparatus in Embodiment 1 of this invention. It is a figure which shows an example of the internal structure of the measurement process part by Embodiment 1 of this invention. It is a figure which shows schematically the whole structure of the elevator control apparatus by Embodiment 2 of this invention. It is a figure for demonstrating the car traveling control at the time of floor height learning by control of the control processing apparatus in Embodiment 2 of this invention. It is a figure which shows schematically the whole structure of the elevator control apparatus by Embodiment 3 of this invention. It is a figure for demonstrating the car running control at the time of floor height learning by control of the control processing apparatus in Embodiment 3 of this invention. It is a schematic block diagram of an example at the time of comprising the control processing apparatus of the elevator control apparatus of this invention with a computer.

  Hereinafter, an elevator control device and a control method according to the present invention will be described with reference to the drawings according to each embodiment. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing an overall configuration of an elevator control apparatus according to Embodiment 1 of the present invention. In the elevator, a car 1 for passengers to ride on one end of the main rope 2 and a counterweight 3 are attached to the other end. The main rope 2 is hung on the hoisting machine 4, and the car 1 and the counterweight 3 are raised and lowered in opposite directions by hoisting or lowering the main rope 2 by the hoisting machine 4.
The car 1 is provided with a governor 5. The governor 5 includes a loop-shaped governor rope 5a to which the car 1 is fixed, and upper and lower governor sheaves 5b on which the governor rope 5a is hung. The governor 5 is provided with a rotational speed detector 6 that detects the rotational speed, for example, an encoder, and outputs the rotational speed NRO. The rotation speed detector 6 may be provided in the hoisting machine 4 as indicated by a broken line. The rotation speed detector 6 is not shown in other drawings of the present application.

Inside the hoistway, a landing plate 7 is provided at a position corresponding to the landing zone of each floor. There may be a case where a plurality of landing plates 7 are installed on each floor, such as a door zone that is a zone that permits door opening and closing of doors, a relevel zone that permits releveling, and the like.
The landing plate detector 8 is installed in the car 1 in order to detect the landing plate 7. When a plurality of types of landing plates 7 are installed, such as a door zone and a relevel zone that permits releveling, a landing plate detector 8 is installed for each type. The car 1 to which the landing plate detector 8 is attached moves and comes to a height position equivalent to the landing plate 7, and the landing plate detector 8 faces the landing plate 7. The detector 8 detects the landing plate 7 and outputs a landing plate detection signal PDS. As will be described later, the landing plate detector 8 detects one of both ends of each landing plate 7 along the traveling direction of the car 1, and this is a measurement point where the rotation speed NRO from the rotation speed detector 6 is counted. Become.

  A control processing device 9 according to Embodiment 1 of the present invention includes a measurement processing unit 10, a storage unit 11, and a drive control unit 12.

The control processing device 9 can be constituted by, for example, a computer 100 whose schematic configuration is shown in FIG. Input / output is performed via the interface 101. The memory 103 stores in advance various function programs indicated by functional blocks for control, which will be described later, and information, data, and the like necessary for processing, and further stores processing results and the like. The processor 102 performs arithmetic processing on a signal input via the interface 101 in accordance with various programs, information, and data stored in the memory 103, and outputs a processing result via the interface 101, or a necessary processing process. The processing result is stored in the memory 103. For example, various functions indicated by blocks described later of the measurement processing unit 10 and the drive control unit 12 in FIG. 1 are stored in the memory 103 as programs. The storage unit 11 corresponds to the memory 103.
In addition, the control processing device 9 can also be configured by one or a plurality of digital circuits that execute various functions indicated by blocks described later of the measurement processing unit 10 and the drive control unit 12.

The measurement processing unit 10 counts the rotation speed NRO from the rotation speed detector 6 in accordance with the measurement command DEC from the drive control unit 12, and the landing plate is detected according to the landing plate detection signal PDS obtained from the landing plate detector 8. The count value of the rotational speed NRO at the timing of detection of escape from 7 or detection of entry into the landing plate 7 is measured. Then, the floor height is calculated by obtaining a difference in count values relating to landing floors 7 of different floors, for example, adjacent floors.
The floor height data FHD calculated by the measurement processing unit 10 is stored in the storage unit 11. Although not directly related to the present invention, the drive control unit 12 performs the landing control of the car 1 to the stop floor after the floor height learning, based on the floor height data stored in the storage unit 11, By outputting a control command COC to the hoisting machine 4, the landing control of the car 1 to the floor requested by the car call, landing, etc. is performed.

The drive control unit 12 causes the car 1 to perform a floor height learning operation during floor height learning, and causes the car 1 to travel from the lowest floor to the top floor at the first speed V1 that is the rated speed. Thereafter, the drive control unit 12 causes the car 1 to travel at a second speed V2 that is lower than the first speed V1 in order to obtain the floor height of the lowest floor. As will be described later with reference to FIG. 3, the second speed V2 is accelerated from the lowest floor to the second speed V2, and the car 1 is at the lowest floor from the time when the speed becomes the second speed V2. Time until exiting the landing plate 7, more specifically, the landing plate detector 8 of the car 1 passes through the end of the lower floor landing plate 7 from the time when the speed reaches the second speed V2. It is determined that the set time length that is set in advance is secured.
The preset time length is determined by obtaining the natural frequency, damping coefficient, etc. from the machine specifications of the elevator mechanical mechanism including the car 1, the main rope 2, the counterweight 3, the hoisting machine 4, and the governor 5. Is set to a value larger than the time length during which the signal sufficiently attenuates. Taking into account variations in machine specifications, it is preferable to determine with sufficient margin for the obtained decaying time length.

FIG. 2 is a diagram for explaining car traveling control during floor height learning under the control of the control processing device 9 according to Embodiment 1 of the present invention. 2A is a schematic diagram of the elevator, FIG. 2B is a measurement location, FIG. 2C is the speed of the car 1, FIG. 2D is the amount of expansion / contraction of the governor rope 5a, and FIG. . The vertical axis indicates the car position corresponding to (a).
The drive controller 12 causes the car 1 to travel from the lowest floor to the highest floor at the first speed V1. In the floor height learning, the end of the landing plate 7 indicated by a black circle in FIG.

In the case of a high head, when accelerating from the lowest floor, the car 1 is accelerating at the upper end portion of the landing plate 7 on the lowest floor. Therefore, as shown in FIGS. The amount of expansion / contraction of the main rope 2 increases. Therefore, an error due to expansion and contraction is superimposed on the rotation speed count value at the time of detecting the escape from the upper end of the landing plate 7 in the measurement processing unit 10, and this becomes an error in floor height learning.
Further, the magnitude of the rope expansion / contraction of the governor rope 5a or the main rope 2 is proportional to the magnitude of the acceleration / deceleration. When the acceleration and deceleration are equal, when the car 1 is decelerated to the lowest floor, the rope expansion / contraction direction of the governor rope 5a or the main rope 2 is equal, but the rope expansion / contraction direction changes.
In the case of upper floors, the mechanical system becomes highly rigid, the amount of expansion and contraction of the rope becomes small, and errors superimposed as floor height learning are often negligible.

  FIG. 3 is a diagram for illustrating car traveling control for measuring the floor height of the lowest floor during floor height learning under the control of the control processing device 9 according to Embodiment 1 of the present invention. The drive control unit 12 causes the car 1 to travel at a second speed V2 lower than the first speed V1 with respect to the floor height of the lowest floor. 3A is a schematic diagram of the elevator, FIG. 3B is a measurement location, FIG. 3C is the speed of the car 1, FIG. 3D is the amount of expansion / contraction of the governor rope 5a, and FIG. . The vertical axis indicates the car position corresponding to (a).

As shown in FIG. 3, since the acceleration time is short at the second speed V2, the expansion / contraction amount of the governor rope 5a (d) and the expansion / contraction amount of the main rope 2 (e) during acceleration are large, but The car 1 is traveling at a constant speed at the measurement point of the landing plate 7 on the lowest floor shown in FIG. Further, the length of time shown in FIG. 3 corresponding to the car position until the landing plate detector 8 of the car 1 escapes from the upper end of the landing plate 7 after the speed after the acceleration is finished becomes the second speed V2. The set time length is secured for T, and the vibration generated when the acceleration changes is sufficiently attenuated. Therefore, an error due to expansion / contraction of the main rope 2 or the governor rope 5a is not superimposed on the rotation speed count value at the time of measuring the position of the landing plate 7 in the measurement processing unit 10.
In the travel shown in FIG. 3, measurement is performed on the lowest floor and the next adjacent floor.

  FIG. 4 shows an example of the internal configuration of the measurement processing unit 10 according to Embodiment 1 of the present invention. The measurement processing unit 10 includes a floor height measurement unit 10a, an error calculation unit 10b, and a correction unit 10d. Although the storage unit 11 is shown as being shared in the control processing device 9, for example, a dedicated storage area of the measurement processing unit 10 may be set in the storage unit 11, or a separate memory may be provided.

  The floor height measuring unit 10a counts the rotational speed NRO from the rotational speed detector 6 in accordance with the measurement command DEC from the drive control unit 12, and more specifically, the floor plate measuring unit 10a The count value of the number of rotations at the timing of detection of escape from the front end in the traveling direction of the car 1 or entry detection of the car 1 to the front end in the traveling direction on the landing plate 7 is measured. Subsequently, the floor height of the lowermost floor is calculated by calculating the difference in count value between the lowermost floor and the adjacent floor. Here, both the lowest floor height LFH1 at the first speed V1 and the lowest floor height LFH2 at the second speed V2 are output as floor height data LFHD.

  The error calculation unit 10b follows the calculation command ACO from the floor height measurement unit 10a, and the floor height LFH1 of the lowest floor at the first speed V1 output from the floor height measurement unit 10a and the second speed. The difference from the lowest floor height LFH2 is calculated as a correction amount (expansion / contraction amount) (ΔLFH = LFH2−LFH1) and stored in the storage unit 11.

The correction unit 10d uses the correction amount ΔLFH stored in the storage unit 11 according to the correction command CCO from the floor height measurement unit 10a, and calculates the lowest floor obtained at the first speed V1 included in the correction command CCO. The high LFH1 is corrected by the correction amount ΔLFH (LFH1−ΔLFH).
The floor height measuring unit 10a replaces the floor height of the lowest floor in the floor height data with the corrected floor height and stores it in the storage unit 11 as floor height data FHD.

The effects of the above configuration are summarized.
During floor height learning, the drive control unit 12 controls the car 1 to run at a constant speed at a second speed V2 lower than the first speed V1 from the lowest floor to the adjacent floor. As a result, the vehicle travels at the second speed V2 only because of the floor height of the lowermost floor, so that it is difficult to be affected by the lower floor with large rope expansion and contraction and the learning time can be shortened.
In addition, the second speed V2 is set to be a set length of time from when the speed is accelerated to the second speed until the car landing plate detector 8 passes through the landing plate 7. Decide as follows. Thereby, by the time the car 1 passes through the landing plate 7, the car vibration due to the rope expansion and contraction at the end of acceleration can be attenuated, and the accuracy of floor height learning can be improved.
The measurement processing unit 10 includes a correction unit 10d that corrects an error when re-learning at the first speed V1. Thus, by calculating and storing the correction amount, it is only necessary to travel at the first speed V1 for the adjusted floor height, and the car can be used to correct the floor height of the lowest floor. There is no need to travel at the second speed V2.

Embodiment 2. FIG.
FIG. 5 is a diagram schematically showing an overall configuration of an elevator control apparatus according to Embodiment 2 of the present invention.
The measurement processing unit 10aa counts the rotation speed NRO of the rotation speed detector 6 according to the measurement command DEC from the drive control unit 12aa, detects the escape of the car 1 from the landing plate 7, or enters the landing plate 7 The number of revolutions at the detection timing is measured to calculate the floor height and stored in the storage unit 11. The internal configuration of the measurement processing unit 10aa is the same as that shown in FIG. 4 of the first embodiment, for example, but the error calculation unit 10b, the correction unit 10d, and the storage unit 11 are not used.

  The drive control unit 12aa first causes the car 1 to travel by accelerating the lowest floor to a second speed V2 that is lower than the first speed V1 that is the above-described rated speed. Thereafter, the car 1 is reaccelerated where there is no landing plate 7, that is, when the landing plate detector 8 of the car 1 does not face the landing plate 7, and the car 1 runs at the first speed V1 up to the top floor. Let The second speed is a set time in which the length of time from when the speed reaches the second speed until the landing plate detector 8 of the car 1 escapes from the upper end of the landing plate 7 is set in advance. The length is determined to be secured. The preferred set time length is the same as in the above embodiment.

  FIG. 6 is a diagram for explaining the car traveling control at the time of floor height learning by the control of the control processing device 9 according to the second embodiment of the present invention. 6A to 6E show the same components as those in FIGS. 2 and 3 of the first embodiment.

  The drive control unit 12aa causes the car 1 to travel at the second speed V2 lower than the first speed V1 with respect to the lowest floor. As shown in FIG. 6, since the acceleration time is short at the second speed V2, the car 1 travels at a constant speed at the measurement point of the landing plate 7 on the lowermost floor indicated by a black circle in FIG. 6 (b). . The set time length is secured as the time length from when the speed after the acceleration ends to the second speed V2 until the landing plate detector 8 of the car 1 escapes from the upper end of the landing plate 7, Vibration generated when the acceleration changes is also sufficiently attenuated.

  After the landing plate detector 8 escapes from the lowest floor landing plate 7, the car 1 is reaccelerated to the first speed V1. There is a sufficient distance to the next floor next to the lowest floor, and the car 1 at the measurement point of the landing plate 7 on the next floor below the lowest floor shown in FIG. The vehicle travels at a constant speed of the first speed V1.

  Therefore, an error due to expansion / contraction of the main rope 2 or the governor rope 5a is not superimposed on the rotation speed count value at the time of measuring the position of the landing plate 7 in the measurement processing unit 10aa.

  In the case of the upper floor, since the mechanical system has high rigidity, the amount of expansion and contraction of the rope is small, and the error superimposed as floor height learning is often negligible. Therefore, here, the car 1 does not pass the landing plate 7 at a constant speed on the top floor side.

The effects of the above configuration are summarized.
During floor height learning, the drive control unit 12aa causes the landing plate detector 8 of the car 1 to move after the car 1 travels at the second speed V2 that is lower than the first speed V1 on the lowest floor. The car 1 is reaccelerated at a position not facing the landing plate 7 and travels to the top floor at the first speed V1. This eliminates the need to individually learn the lowest floor height.
In addition, the second speed V2 has a set time length from the time when the speed after the acceleration is finished becomes the second speed V2 until the landing plate detector 8 leaves the upper end of the landing plate 7. Has been decided to be. Thereby, by the time the car 1 passes through the landing plate 7, the car vibration due to the expansion or contraction of the governor rope or the main rope at the end of acceleration can be attenuated, and the accuracy of floor height learning can be improved.

Embodiment 3 FIG.
FIG. 7 is a diagram schematically showing an overall configuration of an elevator control apparatus according to Embodiment 3 of the present invention.

The measurement processing unit 10bb is the same as the measurement processing unit 10aa in FIG. 5 of the second embodiment.
The drive control unit 12bb does not have the landing plate 7, that is, the car is stepwise up to the first speed V1 that is the rated speed for each section where the landing plate detector 8 of the car 1 does not face the landing plate 7. Re-accelerate 1 Further, after the acceleration for each acceleration section, the time length from the landing plate detector 8 to the escape or entry from the landing plate 7 is secured, so that the vibration generated when the acceleration changes is sufficiently attenuated. Control. The preferred set time length is the same as in the above embodiment.

FIG. 8 is a diagram for explaining car traveling control during floor height learning under the control of the control processing device 9 according to the third embodiment of the present invention.
The drive control unit 12bb travels at the second speed V2 lower than the first speed V1 with respect to the lowest floor. As shown in FIG. 8, since the acceleration time is short at the second speed V2, the car 1 travels at a constant speed at the measurement point of the landing plate 7 on the lowermost floor shown by a black circle in FIG. 8 (b). . Further, the set time length is secured as the time length Ta from when the speed after the acceleration is finished to the second speed until the landing plate detector 8 of the car 1 escapes from the upper end of the landing plate 7. Vibration generated when the acceleration changes is also sufficiently attenuated.

  After exiting the landing plate 7 on the lowest floor, the car 1 is re-accelerated to a third speed V3 (V1> V3> V2) lower than the first speed V1 and higher than the second speed V2. As shown in FIG. 8, the acceleration time to the third speed V3 is short. Furthermore, the time length Tb from when the speed after the end of acceleration reaches the third speed V3 until the car 1 enters the landing plate 7 on the adjacent floor is secured, and is generated when the acceleration changes. Vibration is also damped sufficiently. Therefore, the car 1 travels at a constant speed at the measurement location of the landing plate 7 on the next floor next to the lowest floor indicated by a black circle in FIG.

  Therefore, an error due to expansion / contraction of the main rope 2 or the governor rope 5a is not superimposed on the rotation speed count value at the time of measuring the position of the landing plate 7 in the measurement processing unit 10bb. Thereafter, re-acceleration is performed step by step up to the first speed V1 for each section where the landing plate 7 is not present, and no error is superimposed.

  In the case of the upper floor, since the mechanical system has high rigidity, the amount of expansion and contraction of the rope is small, and the error superimposed as floor height learning is often negligible. Therefore, here, the uppermost floor does not pass through the landing plate 7 at a constant speed.

The effects of the above configuration are summarized.
During floor height learning, the drive control unit 12bb performs re-acceleration step by step up to the first speed V1 for each section without the landing plate 7. Thereby, for example, even when the floor height is shortened in a car with a two-door configuration, it is difficult to be affected by rope expansion and contraction due to acceleration, and the learning time can be further shortened.
In addition, after the acceleration in each section where the landing plate 7 is not present, control is performed so that the set time length is ensured for the time length until the landing plate 7 of the car 1 escapes or enters. Thereby, by the time the car 1 passes through the landing plate 7, the car vibration due to the rope expansion and contraction at the end of acceleration can be attenuated, and the accuracy of floor height learning can be improved.

The landing plate 7 and the landing plate detector 8 detect the landing plate 7 provided at the floor position in the hoistway by the landing plate detector 8 provided in the car 1 to determine the floor position. A floor position detection unit (7, 8) for detection is configured.
The rotation speed detector 6 constitutes a car movement distance detector (6) that detects the movement distance of the car based on the movement of the governor rope 5a or the main rope 2.
Then, the measurement processing unit 10 measures the floor height from the detected floor position and the moving distance of the car during the floor height learning operation.

Further, even when the rotational speed detector 6 is attached to the hoisting machine 4, the main rope 2 is expanded and contracted as shown in FIGS. 2, 3, 6, and 8. By applying 1, 2 and 3, higher accuracy of floor height learning can be similarly expected.
In each of the above embodiments, the car 1 is raised from the lowest floor to the top floor during floor height learning. However, the same operation is performed even when the car 1 is lowered from the top floor to the bottom floor. Is possible.

Industrial applicability

  The elevator control apparatus and control method according to the present invention can be widely applied to elevators that use floor height information for landing control of rope type elevators.

Claims (10)

A floor position detector for detecting a floor position by detecting a floor plate provided at a floor position in the hoistway with a floor plate detector provided in the car;
A car movement distance detector that detects the movement distance of the car based on the movement of the governor rope or the main rope;
A drive control unit that performs floor height learning operation on the car during floor height learning;
A measurement processing unit that measures the floor height based on the detected floor position and the movement distance of the car during the floor height learning operation;
A storage unit for storing the measured floor height;
With
The elevator control device, wherein the drive control unit passes the car at a constant speed through at least the landing plate on the lowest floor during the floor height learning operation.   2. The drive control unit according to claim 1, wherein the drive control unit causes the car to travel at a constant speed at a second speed lower than the first speed, which is a rated speed, from a lowest floor to a next adjacent floor. Elevator control device. The floor position detection unit detects an end of the landing plate along the traveling direction of the car,
As for the second speed, the set time length is ensured from the time when the car is accelerated to reach the second speed until the landing plate detector passes through the end of the landing plate. The control device for an elevator according to claim 2, wherein the control device is determined as follows. The measurement unit is
The floor height of the lowest floor is obtained by storing an error between the floor height measured by running the car at the second speed and the floor height measured by running at the first speed in the storage unit. An error calculation unit;
A correction unit for correcting with the error when re-learning at the first speed;
The control apparatus of the elevator of Claim 2 or Claim 3 containing this.   The drive control unit causes the landing plate detector to move the floor at a constant speed at a second speed lower than the first speed, which is the rated speed of the car, on the lowest floor. The elevator control device according to claim 1, wherein the car is reaccelerated in a section where no plate is detected, and travels to the top floor at the first speed. The floor position detection unit detects an end of the landing plate along the traveling direction of the car,
As for the second speed, the set time length is ensured from the time when the car is accelerated to reach the second speed until the landing plate detector passes through the end of the landing plate. The control device for an elevator according to claim 5, wherein the control device is determined as follows.   The said drive control part re-accelerates the said car in steps to the 1st speed which is the rated speed of the said car for every area where the said landing plate detector does not detect the said landing plate. The elevator control device described in 1. The floor position detection unit detects an end of the landing plate along the traveling direction of the car,
The said drive control part controls the speed | rate of a cage | basket | car so that the time length to the escape or approach of the said landing plate of the said landing plate detector may be ensured after the acceleration in every said area. The elevator control device according to claim 7.   The elevator control device according to any one of claims 3, 6, and 8, wherein the set time length is a time length greater than a time length during which vibration of an elevator mechanical mechanism due to acceleration of a car is sufficiently attenuated. Let the car do the high-story learning driving,
Detecting the floor position by detecting the landing plate provided at the floor position in the hoistway with the landing plate detector provided in the car,
Detects the travel distance of the car based on the movement of the governor rope or main rope,
The floor height is measured and stored based on the detected floor position and the moving distance of the car,
A method for controlling an elevator, wherein the car is passed at a constant speed through at least the landing plate on the lowest floor.

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