JP2006131402A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator control device capable of preventing reduction in the operation efficiency of an elevator. <P>SOLUTION: A pulse generator 11 has a command correcting part 19 for measuring the pulse number of a pulse signal generated according to a moving distance of a car 4 in a measuring section between a first reference position and a second reference position set in a hoistway. The command correcting part 19 stores the pulse number measured in advance in the measuring section as an initial pulse total number, and corrects a tail end speed command value by a rate of the change of the initial pulse total number and a present pulse total number with the pulse number measured in the measuring section as the present pulse number after storing the initial pulse total number. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator control device that monitors an abnormal speed of a car near a terminal floor.

  In the prior art, an end speed command signal is obtained from outputs from a plurality of end point detectors provided near the end floor of a hoistway and outputs from a pulse generator. And when the failure of the apparatus which generate | occur | produces a regular speed command signal has occurred, the cage | basket | car was controlled to decelerate and land on the floor of a termination | terminus floor according to the termination | terminus speed command signal (for example, refer patent document 1).

Japanese Patent Laid-Open No. 58-685

  The prior art as described above does not take into account the aging of the drive sheave, governor sheave and rope. That is, as the sheave diameter decreases due to wear, the number of pulses per car travel distance increases. In addition, when the rope becomes thin due to wear or when the rope becomes thick due to oil adhesion, the sheave diameter is the sum of the rope diameters, resulting in a change in the apparent sheave diameter. The number of pulses per car movement distance will change. In this way, when the number of pulses per car movement distance changes due to aging of each device, the extracted terminal speed command value changes, and as a result, when the terminal speed command signal interferes with the normal speed command signal, As a countermeasure against interference, for example, a situation in which the car suddenly stops or cannot be restarted may occur, which may reduce the operation efficiency of the elevator.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an elevator control device that can prevent a decrease in the operation efficiency of the elevator.

  In the elevator control device according to the present invention, the number of pulses of the pulse signal generated by the pulse generator in accordance with the amount of movement of the car is set between the first reference position and the second reference position set in the hoistway. A command correction unit that measures in the measurement interval between, and the command correction unit stores the number of pulses measured in advance in the measurement interval as the initial pulse total number and is measured in the measurement interval after storing the initial pulse total number The number of pulses is the current pulse number, and the terminal speed command value is corrected based on the rate of change between the initial pulse total number and the current pulse total number.

  According to the present invention, the number of pulses measured in advance in the measurement section is stored as the initial pulse total number, and the number of pulses measured in the measurement section after storing the initial pulse total number is set as the current pulse number. Since the terminal speed command value is corrected based on the rate of change from the total number of pulses, it is possible to prevent a decrease in elevator operating efficiency.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, the front of the position of the predetermined distance L ₀ from floor 1 of the top floor, are disposed cams 2. Also, the first end point detector 3A, the second end point detector 3B, the third end point detector 3C, and the fourth end point detector 3D, which are switches, are respectively located at a predetermined distance L ₁ from the floor 1 (first ), L ₂ position (second reference position), L ₃ position, and L ₄ position (L ₀ > L ₁ > L ₂ > L ₃ > L ₄ ).

  The car 4 is provided with a deceleration preparation point detector 5 that engages with the cam 2. Further, the car 4 is provided with an end point detection cam 6 that engages with the first end point detector 3A to the fourth end point detector 3D. The car 4 and the counterweight 7 are suspended by the main rope 8. The main rope 8 is wound around the drive sheave 9. The drive sheave 9 is rotated by the hoisting machine 10. The hoisting machine 10 is connected to a pulse generator 11 that generates a pulse signal according to the amount of movement of the car 4.

A pulse counter 12 is connected to the pulse generator 11. The pulse counter 12 counts the pulse signals from the pulse generator 11 and outputs a car position signal 12 a according to the movement amount of the car 4. Further, a subtraction counter 13 is connected to the pulse generator 11. The subtraction counter 13 uses L _{1 to} L ₄ that are distances from the first end point detector 3A to the fourth end point detector 3D to the top floor 1 as the remaining distance, and the number of pulses corresponding to the remaining distance. Is received as the number of remaining pulses. Then, the subtraction counter 13 receives the number of received pulse signals from the pulse generator 11 for each calculation cycle as the number of extracted pulses. The subtraction counter 13 subtracts the number of extracted pulses from the number of remaining pulses every calculation cycle and outputs the content as a remaining distance signal.

  When the normal speed calculator 14 receives a signal generated when the deceleration preparation point detector 5 is engaged with the cam 2, the current speed of the car 4 is detected by the car position signal 12a and the call detection signal 15 for detecting the call of each floor. The distance from the position to the position of the floor 1 is calculated as a normal speed command distance. Then, the normal speed calculator 14 extracts the normal speed command value according to the normal speed command distance and outputs it to the normal speed command D / A converter 16. The normal speed command D / A converter 16 converts the normal speed command value from the normal speed calculator 14 into an analog signal and outputs a normal speed command signal (Vn).

When the terminal speed calculator 17 receives a signal generated when the end point detection cam 6 is engaged with the first end point detector 3A, the terminal speed calculator 17 starts from the position where the end point detection cam 6 is engaged with the first end point detector 3A. Up to the position of is set as the end section. The terminal speed calculator 17 sets the distance of the terminal section as the remaining distance L ₁ and sets the number of pulse signals corresponding to the remaining distance L ₁ in the subtraction counter 13 as the number of remaining pulses.

Further, when the car 4 rises and the terminal speed calculator 17 receives a signal generated when the end point detection cam 6 is engaged with the second end point detector 3B, the end point detection cam 6 receives the second end point detector 3B. The position from the position engaged to the position of the floor 1 is set as the end section. Terminal velocity calculator 17, the distance of the end section and the remaining distance L _2, set to the subtraction counter 13 the number of pulse signals corresponding to the remaining distance L ₂ as the remaining number of pulses.

Similarly, the terminal speed calculator 17 receives a signal generated when the end point detection cam 6 is engaged with the third end point detector 3C or the fourth end point detector 3D and receives the remaining distance L ₃ or the remaining distance L. _The number of pulse signals corresponding to ₄ is set in the subtraction counter 13 as the number of remaining pulses. The terminal speed calculator 17 receives the remaining distance signal from the subtraction counter 13 after setting the number of remaining pulses.

  The terminal speed calculator 17 converts the remaining distance signal into an extraction address for extracting the terminal speed command value. The terminal speed calculator 17 extracts the terminal speed command value corresponding to the extraction address. Then, the terminal speed calculator 17 outputs the terminal speed command value to the terminal speed command D / A converter 18. The terminal speed command D / A converter 18 converts the terminal speed command value from the terminal speed calculator 17 into an analog signal, and corrects and outputs the terminal speed command signal (Vs). Thus, the terminal speed command signal is corrected and output every time the remaining distance signal received by the terminal speed calculator 17 changes.

  The terminal speed calculator 17 has a command correction unit 19. The command correction unit 19 sets the interval between the first end point detector 3A and the second end point detector 3B as a measurement section. The command correction unit 19 stores the total number of pulse signals from the pulse generator 11 as the initial pulse total number in accordance with the amount of movement of the car 4 moving in the measurement section.

  The timing at which the command correction unit 19 stores the initial pulse total number is, for example, when an external switch provided on a control panel (not shown) is turned on. Specifically, the command correction unit 19 determines the value of the pulse counter 12 when a signal generated by the end point detection cam 6 engaging with the first end point detector 3A is received when the external switch is on. Store as PL1. Next, the command correction unit 19 sets the value of the pulse counter 12 as PL2 when the car 4 is raised and a signal generated by the end point detection cam 6 engaging the second end point detector 3B is received. Remember. Then, the command correction unit 19 stores the value obtained by subtracting PL1 from PL2 as the initial pulse total number.

  After storing the total number of initial pulses, the command correction unit 19 obtains the total number of pulse signals generated by the pulse generator 11 as the current total number of pulses according to the amount of movement of the car 4 moving in the measurement section. Then, the command correction unit 19 obtains the rate of change by dividing the initial pulse total number by the current pulse total number. This rate of change indicates a variation in the number of pulses from the pulse generator 11 per moving distance of the car 4 due to the secular change of the main rope 8 and the drive sheave 9. For example, when the sheave diameter of the drive sheave 9 is reduced due to wear, the number of pulses from the pulse generator 11 per moving distance of the car 4 increases. If the main rope 8 becomes thicker due to oil or the like adhering to it, the apparent sheave diameter of the drive sheave 9 increases, and the number of pulses from the pulse generator 11 per movement distance of the car 4 decreases.

  The command correction unit 19 confirms the pulse count value inside the pulse counter 12 and sets the amount of change in the pulse count value for each calculation cycle as the number of extracted pulses. The command correction unit 19 multiplies the extraction pulse number by the change rate to obtain the correction pulse number, and replaces the extraction pulse number of the subtraction counter 13 with the correction pulse number. Thereby, the terminal speed command value extracted corresponding to the remaining distance signal is corrected. That is, the value obtained by subtracting the number of correction pulses from the number of remaining pulses for each calculation cycle has a change corresponding to the rate of change multiplied by the value obtained by subtracting the number of extracted pulses from the number of remaining pulses. . This change is reflected in the remaining distance signal, and correction is performed in such a way that a change occurs in the extraction frequency of the terminal speed command value extracted by the extraction address.

  The normal speed command signal and the terminal speed command signal are input to the speed command comparator 20, respectively. The speed command comparator 20 looks at the value of each speed command signal and outputs Vn if Vn <Vs. If Vn ≧ Vs, Vs is output. However, when the value of the terminal speed command signal decreases and Vn ≧ Vs, the safety circuit of the speed command comparator 20 operates and the speed command comparator assumes that the terminal speed command signal has interfered with the normal speed command signal. The output of 20 is stopped and the operation of the elevator is restricted. Specifically, the elevator apparatus is in a state where the car 4 is suddenly stopped or cannot be restarted. The speed control device 21 controls the hoisting machine 10 according to the normal speed command signal or the terminal speed command signal from the speed command comparator 20.

  FIG. 2 is an explanatory diagram showing the relationship between the calculation time after the normal speed calculator 14 and the terminal speed calculator 17 of FIG. 1 start extracting the speed command value and the value of the speed command signal. In the figure, if the elevator apparatus is operating normally, a relationship of Vn <Vs is established. If any of the pulse counter 12, the deceleration preparation point detector 5, the normal speed calculator 14, or the normal speed D / A converter 16 fails and Vn ≧ Vs, the speed command comparator 20 terminates. A speed command signal is output. Further, when the number of pulses output from the pulse generator 11 per moving distance of the car 4 increases due to aging of the main rope 8 and the drive sheave 9, the extraction speed of the terminal speed command value extracted by the remaining distance signal is increased. There is a possibility that Vn ≧ Vs.

  FIG. 3 is a block diagram showing the terminal speed calculator 17 of FIG. In the figure, the terminal speed calculator 17 has an input device 17A, a CPU (Central Processing Unit) 17B, a ROM (Read Only Memory) 17C, a RAM (Read / Write Memory) 17D, and an output device 17E. The input device 17A includes a first end point detector 3A, a second end point detector 3B, a third end point detector 3C, a fourth end point detector 3D, a pulse counter 12, a subtraction counter 13, and a speed command comparator 20. Is connected. In the CPU 17B, the program used in the first embodiment is executed and data is processed. The ROM 17C stores programs used in the first embodiment and end speed command value data. The RAM 17D stores data on the total number of initial pulses. The output device 17E converts the information processed by the CPU 17B into a signal that can be processed externally and outputs the signal.

  Next, the operation will be described. FIG. 4 is a flowchart showing the initial pulse total number storing operation when the command correcting unit 19 in FIG. 1 stores the initial pulse total number. In the command correction unit 19, the initial pulse total number storing operation shown in FIG. 4 is executed only once when the external switch of the control panel is turned on. In the initial total pulse number storing operation, first, the pulse count value of the pulse counter 12 when the end point detection cam 6 is engaged with the first end point detector 3A is stored as PL1 (step S101). Next, the pulse count value of the pulse counter 12 when the end point detection cam 6 is engaged with the second end point detector 3B is stored as PL2 (step S102). Then, PL1 is subtracted from PL2 and calculated as an initial pulse total number (step S103), and the initial pulse total number is stored as PINIT (step S104).

  FIG. 5 is a flowchart showing the change rate calculation operation when the change rate of the command correction unit 19 of FIG. 1 is calculated. In the command correction unit 19, the change rate calculation operation shown in FIG. 5 is executed every time the car 4 moves through the measurement section after storing the total number of initial pulses. In the change rate calculation operation, first, similarly to the calculation of the initial pulse total number PINIT, the pulse number corresponding to the distance between the first end point detector 3A and the second end point detector 3B is the current total pulse number. Calculated as PNOW (step S201). Next, a value obtained by dividing PINIT by PNOW is calculated as a change rate PER (step S202).

  FIG. 6 is a flowchart showing the terminal speed command value correcting operation when the terminal speed command value of the command correcting unit 19 in FIG. 1 is corrected. In the command correcting unit 19, the terminal speed command value correcting operation shown in FIG. 6 is executed every time the car 4 moves in the terminal section. In the terminal speed command value correcting operation, first, a pulse count value that changes every calculation cycle is calculated as PULSE inside the pulse counter 12 (step S301). Then, PULSE is multiplied by the change rate PER to calculate the correction pulse number PNM (step S302).

  Next, the number of extracted pulses of the subtraction counter 13 is replaced with the correction pulse number PNM (step S303). In the subtraction counter 13, the number of subtractions for each calculation cycle for reducing the number of remaining pulses changes and is reflected in the remaining distance signal output from the subtraction counter 13. Then, the terminal speed calculator 17 converts the remaining distance signal into the extracted address, and corrects the terminal speed command value extracted from the extracted address (step S304).

  As described above, according to the elevator apparatus according to the first embodiment, the command correction unit 19 stores the number of pulses measured in advance in the measurement section as the initial pulse total number, and the measurement section after storing the initial pulse total number. The terminal speed command value is corrected based on the rate of change between the initial pulse total number and the current pulse total number, with the number of pulses measured in step 1 as the current pulse number. Can prevent the car 4 from being suddenly stopped or restarted due to interference with the regular speed command signal, and can prevent a decrease in the operation efficiency of the elevator.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. The overall apparatus configuration of the second embodiment is the same as that shown in FIG. In the second embodiment, the command correction unit 19 determines whether to correct the terminal speed command value based on the calculated change rate, based on whether the correction command signal from the speed command comparator 20 is received. When receiving the correction command signal, the command correction unit 19 changes the built-in FLAG register value. The FLAG register value is 00H at the initial value when the correction command signal is not received. When the correction command signal is received, the FLAG register value is FFH. The command correction unit 19 sets the rate of change to 1 when no correction command signal is received. As a result, the terminal speed command value is brought into the same state as that which has not been corrected.

  Further, the command correction unit 19 indicates the correction status of the terminal speed command value by converting the FLAG register value into a signal and outputting it as a warning signal. The warning signal is output to a warning display unit (not shown) which is an LED on the substrate of the terminal speed calculator 17. The warning display unit that has received the warning signal when the FLAG register value is FFH turns on the LED to correct the terminal speed command value and notify the elevator that an abnormality has occurred.

  The speed command comparator 20 subtracts the value of the normal speed command signal from the value of the terminal speed command signal, and determines whether or not the difference between the values of the speed command signals is equal to or less than a predetermined value. The speed command comparator 20 outputs a correction command signal to the command correction unit 19 if the difference between the values of the speed command signal is equal to or less than a predetermined value.

  FIG. 7 is a flowchart showing the FLAG register value changing operation of the command correction unit 19 of FIG. In the command correction unit 19, the FLAG register value changing operation shown in FIG. 7 is repeatedly executed at a predetermined cycle. In the initial state, the FLGA register value is 00H. In the FLAG register value changing operation, first, it is determined whether or not the terminal speed command signal interferes with the normal speed command signal and the correction command signal is received (step S401). If the correction command signal has been received, the FLAG register value is changed to FFH (step S402). If the correction command signal has not been received, this operation is terminated as it is.

  As described above, according to the elevator apparatus according to the second embodiment, the command correction unit 19 determines the correction of the terminal speed command value by receiving the correction command signal. Therefore, the command correction unit 19 depends on the aging of the main rope 8 and the drive sheave 9. The start time of correction of the terminal speed command value can be known, and the maintainability of the elevator can be improved.

  The command correction unit 19 indicates the correction status of the terminal speed command value by converting the FLAG register value into a signal and outputting it as a warning signal. When the terminal speed command value is corrected, a warning display unit Since the information indicating the abnormality of the elevator is displayed, the time required until the maintenance worker confirms the abnormality of the elevator can be shortened, and the maintainability of the elevator can be improved.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. The overall apparatus configuration of the third embodiment is the same as that shown in FIG. In the third embodiment, when the operation of the elevator is restricted by the safety circuit of the speed command comparator 20, the command correction unit 19 calculates the rate of change to cancel / unrelease the restriction of the elevator operation, Judgment is made by checking whether the rate of change is within a predetermined range. When the value of the uncorrected terminal speed command signal decreases and falls below the value of the normal speed command signal, it is assumed that the terminal speed command signal has interfered with the normal speed command signal. Limited by the circuit.

  If the rate of change is within a predetermined range, the command correction unit 19 determines that the operation of the elevator is restricted due to an abnormality in the elevator device other than the secular change of the main rope 8 and the drive sheave 9, Do not lift restrictions on elevator operation. Further, if the rate of change is not within the predetermined range, the command correction unit 19 determines that the operation of the elevator is restricted because the main rope 8 and the drive sheave 9 have changed over time, and the operation of the elevator is Remove the restriction. The restriction release / non-release is determined based on, for example, whether the rate of change is within a range of 0.99 to 1.01.

  FIG. 8 is a flowchart showing the operation restriction control operation of the command correction unit 19 of FIG. In the command correction unit 19, the operation restriction control operation shown in FIG. 8 is repeatedly executed at a predetermined cycle. In the operation restriction control operation, first, it is determined whether the terminal speed command signal interferes with the normal speed command signal and the correction command signal is received (step S501). If the correction command signal has not been received, this operation ends. If a correction command signal has been received, the rate of change is confirmed (step S502), and it is confirmed whether the rate of change is within a predetermined range (step S503).

  If the rate of change is within a predetermined range, the command correction unit 19 does not cancel the restriction on the operation of the elevator, and this operation is terminated as it is. If the rate of change is not within the predetermined range, the command correction unit 19 corrects the terminal speed command value (step S504), releases the restriction on elevator operation (step S505), and the operation ends.

  Thus, according to the elevator apparatus according to the third embodiment, the command correction unit 19 confirms the rate of change when the operation of the elevator is restricted by the safety circuit of the speed command comparator 20, and further changes the rate of change. If the change rate is not within the predetermined range, the main rope 8 and the drive sheave 9 have changed over time, and the terminal speed command signal is the normal speed command. Since it can be determined that the operation of the elevator is restricted due to interference with the signal, and then the restriction on the operation of the elevator can be released, it is possible to improve the service of the operation of the elevator.

In the above example, the timing at which the command correction unit 19 stores the initial pulse total number is when the external switch is turned on, but the timing at which the command correction unit stores the initial pulse total number is limited to this. Not. For example, the initial pulse total number may be stored by moving the car to the measurement section when the power is turned on.
In the above example, as the definition of the interference of the terminal speed command signal to the normal speed command signal, the value of the terminal speed command signal decreases and falls below the value of the normal speed command signal. It is not limited to this. For example, when the value of the normal speed command signal exceeds the value of the terminal speed command signal for whatever reason, the definition of interference may be used.
Furthermore, in the above example, the device provided with the safety circuit that is a countermeasure circuit in the event of interference between the terminal speed command signal and the normal speed command signal is the speed command comparator 20, but the device provided with the safety circuit is here. It is not limited.

Furthermore, in the above example, as a method of correcting the terminal speed command value, the method of subtracting the number of remaining pulses by the number of corrected pulses and changing the degree of decrease in the number of remaining pulses is shown. Not. For example, a device for multiplying the rate of change may be provided between the pulse generator and the subtraction counter. Alternatively, the terminal speed command value may be corrected by directly managing the remaining distance with the terminal speed calculator without using the subtraction counter.
In the above example, the warning display unit from which the command correction unit 19 outputs a warning signal is an LED on the substrate of the terminal speed calculator 17, but the type of the warning display unit is not limited to this. For example, a personal computer or a maintenance computer may be used as a warning display unit to display the contents of the warning signal.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is explanatory drawing which showed the relationship between the calculation time after the normal speed calculator and terminal speed calculator of FIG. 1 started extracting a speed command value, and the value of a speed command signal. It is a block diagram which shows the termination | terminus speed calculator of FIG. 3 is a flowchart showing an initial pulse total number storing operation when storing an initial pulse total number of a command correction unit in FIG. 1. It is a flowchart which shows the change rate calculation operation at the time of calculating the change rate of the instruction | command correction | amendment part of FIG. It is a flowchart which shows the terminal speed command value correction | amendment operation | movement at the time of correct | amending the terminal speed command value of the command correction part of FIG. 3 is a flowchart showing a FLAG register value changing operation of the command correction unit in FIG. 1. It is a flowchart which shows the operation | movement restriction | limiting control operation | movement of the command correction part of FIG.

Explanation of symbols

  19 Command correction unit.

Claims (3)

A command correction unit that measures the number of pulses of the pulse signal generated by the pulse generator according to the amount of movement of the car in a measurement section between the first reference position and the second reference position set in the hoistway. With
The command correction unit stores the number of pulses measured in advance in the measurement section as an initial pulse total number, and stores the number of pulses measured in the measurement section after storing the initial pulse total number as the current pulse number. An elevator control apparatus that corrects a terminal speed command value based on a rate of change between a total number of initial pulses and the total number of current pulses.   The said command correction part correct | amends the said termination | terminus speed command value with the said change rate, when it detects that the difference of the said termination | terminus speed command value and a normal speed command value is less than predetermined value. The elevator control apparatus according to 1.   The elevator control device according to claim 1, wherein the command correction unit indicates a correction status of the terminal speed command value by outputting a warning signal.

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