JPH0859124A - Elevator operation control method - Google Patents

Abstract

(57) [Summary] [Purpose] In an elevator having multiple drive systems, if a part of the drive system fails, a sound drive system is used to safely stop the car on the floor. [Configuration] Upon detection of a failure signal, the failure system determination processing unit 1 separates a failed drive system from a healthy drive system and stores the failed drive system. The failure system isolation processing unit 2
The output of the drive command to the faulty drive system is stopped by turning OFF SW2, and at the same time (within the same control cycle), SW3 or SW4 is switched to the “× 2” side to set the torque command value to the healthy drive system to 2 Double. In addition, the stop floor setting processing unit 3
Is a floor that can be safely stopped using the position of the car when the failure of the drive system is detected, the car speed at that time, and the deceleration at the time of stop when the processing unit 3 is enabled. The floor is calculated and the floor is given to the control system as the target floor. [Effect] When a failure of any one of the plurality of drive systems is detected, the sound drive system can be used to safely stop the car on the target floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator operation control method and, in particular, to a multi-drive type elevator having a plurality of drive systems, and is applied when a part of the plurality of drive systems fails. And a preferred elevator operation control method.

[0002]

2. Description of the Related Art As a conventional technique relating to control of a multi-drive type elevator, for example, Japanese Patent Laid-Open No. 3-3699.
The technique described in Japanese Patent Publication No. 1 or the like is known.

In this prior art, one car is driven by two inverters during normal operation, and when a failure occurs, the failure side inverter circuit is disconnected by a relay, and a sound side circuit (system) is provided. It is to continue operation only by itself.Specifically, when a failure is detected, the circuit on the side where the failure is detected is turned off by a relay, the inverter on the failure side is disconnected, and the inverter on the normal side is disconnected. The current command to the inverter is controlled so as to be twice as large as the normal condition.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When one car is driven by two inverters and is operated, and when one of the inverters fails, first, the failure side inverter circuit is disconnected by a relay, and then the current command for the normal inverter is set to 2 Since it is doubled, (1) the total torque amount is reduced (the speed of the car is reduced) by disconnecting one system, and (2) Therefore,
The torque load on the normal system temporarily increases and the current command value increases rapidly (the speed of the car rapidly increases). (3) Furthermore, the current command is given twice as much to the normal system (the speed of the car increases Control will be performed by the process of (changing).

For this reason, the above-mentioned prior art causes a great variation in the speed of the car during the above-mentioned steps (1) to (3), which gives a great sense of anxiety to passengers. Have a point.

The object of the present invention is to solve the above-mentioned problems of the prior art, and in the operation control of a multi-drive type elevator, even when a failure of any drive system is detected,
It is an object of the present invention to provide an elevator operation control method capable of safely stopping a car on the floor using a sound (normal) system without causing fluctuations in the speed of the car.

The drive system referred to in the present invention means at least a converter / inverter system, and at least one motor should be provided.

[0008]

According to the present invention, when the control system detects a failure of any drive system in an elevator having a plurality of drive systems, the failure system stores the failed system. Immediately when the output of the drive command to the judgment processing unit and the drive system in which the failure has occurred is stopped (within the same control cycle), the control gain of the speed control system or the torque command value obtained from the speed control system is displayed simultaneously. N / (N-n) times the stored failure system, the drive command value to be output to a sound drive system other than the stored failure system is determined, and a failure system disconnection processing unit that outputs to a sound drive system is provided. This is accomplished by prohibiting the restart of the car based on the stored presence or absence of the drive system of the stored failure after carrying and stopping the car.

Further, in the elevator having a plurality of drive systems, when the control system detects a failure of any drive system, a failure system determination processing section for storing the failed drive system, and a failure occurrence. Stop floor setting processing unit that gives the control system as the target floor by finding the nearest floor that can safely stop the car from the car position, car speed and deceleration at the time, and drive to the drive system where the failure occurred Immediately after the output of the command is stopped (within the same control cycle), the control gain of the speed control system or the torque command value obtained from the speed control system is multiplied by N / (N-n), and the stored failure system is stored. Other than the above, it is equipped with a fault system disconnection processing unit that obtains a drive command value to be output to a sound drive system and outputs it to a sound drive system. The basket After sealed, it is achieved by so as to prohibit the restart of the car based on the presence or absence of stored fault system.

Further, the above-mentioned object is, in the above, that the maintenance company of the elevator when the control system detects a failure,
This is achieved by issuing a notification to that effect to a monitoring center or the like.

In the above description, the command value is N / (N-
The number n) is set when the total number of drive systems is N and the number of failed drive systems is n (N> n ≧ 0).

[0012]

When the control system detects a failure of one of the drive systems of the elevator having a plurality of drive systems, the failure system determination processing unit stores the failed drive system, and the failure system disconnection processing unit performs the failure. Immediately when the output of the drive command to the drive system is stopped (within the same control cycle), the control gain for the speed control system or the torque command value obtained from the speed control system is set to N / (N-n). The drive command value to be multiplied and output to the healthy drive system is obtained and output to the healthy drive system.

As described above, according to the present invention, since the drive system which has failed in the same control cycle can be disconnected and the output of the drive command to the sound drive system can be switched smoothly, the sound drive system is used. By suppressing the speed fluctuation caused by switching to elevator operation, the car can be safely driven to the destination floor and stopped, and then the door can be opened to safely rescue passengers. Further, it is possible to prohibit the restart of the car before the normal recovery based on the stored presence or absence of the failure drive system.

In addition to the above, the present invention further comprises a stop floor setting processing unit, and when the stop of the drive system is detected, the stop floor setting processing unit detects the car position, car speed and Depending on the deceleration, find the nearest floor where the car can be safely stopped and set it as the destination floor.

According to the present invention, since it is possible to smoothly disconnect the failed drive system and switch the output of the drive command to the sound drive system within the same control cycle, the sound drive system is used. To suppress speed fluctuations caused by switching to elevator operation, drive the car to the nearest floor where the car can be safely stopped (newly requested destination floor), and then open the door to rescue passengers safely. You can Further, it is possible to prohibit the restart of the car before the normal recovery based on the stored presence or absence of the failure drive system.

Furthermore, the present invention can notify the maintenance company of the elevator, the monitoring center, etc., when the control system detects a failure.

As described above, according to the present invention, when an elevator having a plurality of drive systems is operated, passengers can be prevented from being confined due to the occurrence of a failure of some drive systems, and the car can be changed to a sound drive system. Speed fluctuations can be suppressed, and passengers' anxiety can be eliminated.

Further, since it can be notified to the elevator maintenance company, the monitoring center, etc., the downtime of the elevator due to a failure can be minimized.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an elevator operation control method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a control system according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the configuration of a multi-drive type elevator to which the present invention is applied, and FIG. 3 is a diagram showing the effect of the present invention. FIG. 4, FIG. 4 is a flowchart for explaining the processing operation of the failure system determination procedure, FIG. 5 is a flowchart for explaining the processing operation of the failure system isolation procedure, and FIG. 6 is a failure system determination procedure and a failure system isolation procedure. FIG. 7 is a flowchart for explaining the processing operation in the case of doing, and FIG. 7 is a flowchart for explaining the processing operation of the stop floor setting procedure. 1 and 2, 1 is a failure system determination processing unit, 2 is a failure system separation processing unit, 3 is a stop floor setting processing unit, 9 is a speed control unit, 21 is a power supply, 22 and 23 are converter-inverters, 24 and 25 are motors, 26 is a sheave, 27 is a car, 28 is a counterweight, 29 and 30 are PWM signal generating units, 31 is a rotary encoder, 32 is a speed control system,
SW0 to SW4 are changeover switches.

First, a configuration example of a current source multi-drive elevator to which the present invention is applied will be described with reference to FIG.

The elevator shown in FIG. 2 is provided with two motors A24 and B25 which are independent from each other on one motor shaft, and each motor A24 and B25 is an independent converter-inverter (hereinafter, simply inverter A). , B
22) and 23, and by rotating the sheave 26 directly connected to the motor shaft by the driving force, the elevator car 27 that is wrapped around the sheave 26 by the rope together with the counterweight 28 is moved up and down. Is configured.

On the other hand, the speed control system 32 uses the sheave speed obtained from the rotary encoder 31, that is, the torque command calculated based on the car speed, to control signals for driving the system (DC current command value I, inverter output current). A command value ω and a phase command value θ) are created, and the inverter A22 and the inverter B23 are controlled based on this control signal. That is, the inverter A22 and the inverter B23
Is controlled via PWM signal generating units 29 and 30 which use the control signal from the speed control system 32 as a PWM signal.

In the example shown in FIG. 2, the inverter A22 is
System, the inverter B23 is a B system, and the speed control system 32 is
As a control signal for the A system inverter A22, a DC current command value I _A *, an inverter output current command value ω _A *, and a phase command value θ _A * are output to the PWM signal creating unit 29 to control the B system inverter B23. As signals, DC current command value I _B *, inverter output current command value ω _B *, phase command value θ
_B * is output to the PWM signal creation unit 30.

A speed control system 32, a PWM signal generating section 29,
30, inverters A22, B23, motors A24, B2
Reference numeral 5 constitutes a closed loop that creates a drive command value based on the torque command value calculated by the speed control system using the received sheave speed and supplies the created drive command value to each inverter.

In the present invention, the control signals for driving the inverter (DC current command value I, inverter output current command value ω, phase command value θ) are collectively referred to as a drive command.

Next, the control system of the present invention applied to the above-mentioned elevator will be described.

The control system according to the embodiment of the present invention shown in FIG. 1 has a configuration of a conventional speed control system (ASR system) indicated by a thin line, and switches SW0 to SW4 and a failure determination processing section indicated by a thick line frame. 1, a failure system separation processing unit 2, and a stop floor setting processing unit 3 are added. Further, in the illustrated embodiment, there are two drive systems, A and B, and each system divides the torque command value equally, so that a failure occurs in one drive system and the other one. When the car is driven by the drive system, the torque command is multiplied by “× 2”.

The embodiment of the present invention can be applied to a case where the total number of drive systems is N. In this case, assuming that the number of drive systems in failure is n (N> n ≧ 0), the torque command is given as N / (N−n) times.

The control system shown in FIG. 1 is based on a speed control unit 9 for generating a torque command based on a deviation between a target speed value and an actual speed of a car, and a torque command corrected based on a load detection amount. Function unit that generates a drive command that is a control signal for driving an inverter, and a failure system determination processing unit 1 that stores a failed drive system based on a failure signal of an elevator.
And a stop floor setting processing unit 3 which provides the control system as a target floor by finding the nearest floor where the car can be safely stopped from the car position, car speed and deceleration when a failure occurs
When the output of the drive command to the drive system in which the failure has occurred is immediately stopped (within the same control cycle), the control gain of the speed control system or the torque command value obtained from the speed control system is set to N / ( N−n) times the stored faulty system, a faulty system disconnection processing unit 2 for obtaining a drive command value to be output to a healthy drive system other than the faulty system and outputting it to a healthy drive system.

The switches SW0 and SW1 included in the control system having the above-described configuration are switches for switching the operation mode of the embodiment of the present invention, and the switch SW2 is
A switch for stopping the output of the drive command to the failure system,
The switches SW3 and SW4 are changeover switches when a failure occurs.

The first operation mode of the embodiment of the present invention when SW0 and SW1 are set to the side a will be described below.

When a failure signal is detected, the failure system determination processing unit 1 separates the failed drive system from the healthy drive system, stores the failed drive system, and stores the failed system separation processing unit 2.
Turns off the switch SW2 to stop the output of the drive command to the faulty drive system (within the same control cycle), and at the same time, switches the switch SW3 to the “× 2” side to generate a torque for the sound drive system Double the command value.

The first embodiment of this embodiment of the present invention
In the above operation mode, the stop floor setting processing unit 3 uses the switch S
It does not work because it is separated by W0.

FIG. 3 shows the current command value and the car speed for a normal drive system when one of the drive systems fails when the elevator car with two drive systems runs at a constant speed. It is shown.

In the example shown in FIG. 3, it is assumed that the car is operated by the two drive systems from the start of the car to the time t1, and a failure occurs in one drive system at the time t1. In this case, in the above-described embodiment of the present invention, as indicated by the thick line in the figure, at the time t1, the failure is detected, and at the same time, the failed drive system is disconnected and the torque command for the normal drive system is doubled. Since the setting process is executed, the current command for the normal drive system is immediately doubled. As a result, one embodiment of the present invention can continue to drive the car with little change in car speed.

FIG. 3 also shows the case of the prior art with a thin line, but in the case of the prior art, the current command for the normal drive system is doubled from time t1 when the failure of one drive system is detected. Until Δt elapses, the speed of the car decreases during this period, and the current command to the normal drive system increases by ΔI accordingly, and then the current command is doubled. . As a result, in the conventional technique, as indicated by a thin line in FIG. 3, a large change occurs in the current command, the speed of the car changes, and the passengers feel uneasy.

As described above, according to one embodiment of the present invention, as soon as a failure of one drive system is detected, the failed drive system is disconnected and the current command for the normal drive system is doubled [drive system]. Total number N, the number of failed drive trains n
(When N> n ≧ 0), N / (N−n) times can be set. Therefore, continue to operate the car in the same way as normal, and stop the car at the destination floor. Can be made.

Next, the processing operation of the failure system determination processing unit 1 and the processing operation of the failure system disconnection processing unit 2 in the first operation mode of the embodiment of the present invention configured as described above will be described in detail. To do.

First, the processing operation of the failure system determination processing section 1 will be described with reference to the flow shown in FIG.

(1) A failure signal from a control system (not shown) is monitored to determine whether a failure has occurred in the drive system. If no failure has occurred, the process ends (step 40).
1).

(2) When the occurrence of a faulty drive system is detected in step 401, the faulty drive system and the healthy drive system are determined and separated (step 402).

(3) The defective drive system separated in the process of step 402 is stored and the process is terminated (step 4).
03).

Next, the processing operation of the fault system isolation processing section 2 will be described with reference to the flow shown in FIG.

(1) A failure signal from a control system (not shown) is monitored to determine whether or not a failure has occurred in the drive system. If no failure has occurred, the process ends. The failure signal is given from the failure system determination processing unit 1 through or as the determination result of step 401 (step 4).
01).

(2) When the occurrence of a faulty drive system is detected in step 501, the faulty drive system stored in step 403 of FIG. 4 is used to output the switch SW2 for outputting the drive command value shown in FIG. The failure system side is turned off (step 502).

(3) Changeover switch SW3 shown in FIG.
Is switched to the “× 2” side, the torque command is doubled, and the process ends (step 503).

The above-described processes of FIGS. 4 and 5 are executed within the same control cycle. As a result, according to the above-described embodiment of the present invention, the elevator car does not undergo speed fluctuation due to disconnection of the failed drive system,
Alternatively, it can be kept to a minimum and operation can continue to the destination floor. And, since one embodiment of the present invention stores the failed drive system, after stopping the car at the destination floor, it is determined whether there is a failed drive system, and if there is a failed drive system, It is possible to perform processing such as prohibiting restart before returning to normal.

The flow shown in FIG. 6 is the same as that shown in FIGS.
The example of the case where the processing operations of the failure system determination processing unit 1 and the failure system disconnection processing unit 2 are performed in one process is shown. The details of the process are the same as those in FIGS. 4 and 5. , The description is omitted.

Next, the second operation mode in the embodiment of the present invention, which is an example in which the switches SW0 and SW1 are set to the b side in the above-mentioned embodiment of the present invention, will be described.

In this operation mode, the failure system determination processing unit 1
However, when a failure signal of the drive system is detected in the same manner as described above, the failed drive system is separated from the healthy drive system to store the failed drive system, and the stop floor setting processing unit 3 causes the drive system failure. Car position and car speed when is detected,
The floor that can be stopped safely is calculated using the deceleration at the time of stop, and the floor is given to the control system as the target floor, and the failure system separation processing unit 2 issues a drive command to the failed drive system by the switch SW2. Simultaneously with the stop (within the same control cycle), the switch SW4 is switched to the “× 2” side to double the control gain at the time of calculating the torque command value.

In this case, the processing operations of the failure system determination processing unit 1 and the failure system separation processing unit 2 are performed by switching the switch SW3 in the flow shown in FIGS.
The other operations are performed in the same manner except that only the switching of No. 4 is performed. Therefore, the description of the processing operation of the failure system determination processing unit 1 and the failure system disconnection processing unit 2 in this operation mode is omitted.

Therefore, here, the stop floor setting processing unit 3
The processing operation will be described with reference to the flow shown in FIG.

(1) First, the current position x0 of the car when the drive system failure is detected, and the current speed v of the car
And the deceleration α when the car is stopped, the floor where the car can safely stop is calculated by the following equation.

Calculation of stop time t = v / α (1) Calculation of stop distance X = vt + (αt ² ) / 2 (2) Remaining distance x = | XL−x0 | (3) where XL is the traveling direction This is the position of the end floor (step 7)
01).

(2) Based on the calculation result of step 701, it is determined whether or not there is a floor on which the car can be safely stopped using the following determination formula.

When x ≧ X, it is determined that there is a floor that can be safely stopped, and when x <X, it is determined that there is no floor that can be safely stopped (step 702).

(3) If it is determined in step 702 that the car has no floor that can be safely stopped, the control system is instructed to make an emergency stop of the car (step 7).
03).

(4) If it is determined in step 702 that there is a floor where the car can safely stop, the floor where the car can safely stop is given to the control system as the target floor. That is, in this case, there is a floor where the remaining distance is larger than the stopping distance and the car can safely stop.
The nearest floor where the car can safely stop is (x0 + X)
(When the car is descending, (x0-X)) is farther than (x0 + X) (When the car is descending, (x0-X)) It can be obtained as the floor position, which is the target floor. It is given to the control system (step 704).

According to the second operation mode of the above-described embodiment of the present invention, the elevator car does not undergo the speed fluctuation due to the disconnection of the defective drive system, or produces the minimum speed fluctuation. You will be driven with the nearest floor where you can safely stop as the destination floor. In this case as well, since the failed drive system is stored, after stopping the car at the destination floor, the presence or absence of the failed drive system is determined, and if there is a failed drive system, the normal operation is performed normally. It is possible to perform processing such as prohibiting restart before returning.

In the above-mentioned embodiment of the present invention,
It is possible to shorten the recovery time by adding the alarm processing to the elevator maintenance company or the monitoring center to the flow at the time of failure occurrence described with reference to FIGS.

In the above-described embodiment of the present invention, in the first operation mode, the switch S3 is used instead of the switch SW3.
W4 is switched to the "x2" side, and in the second operation mode, the switch SW3 is switched to "x2" instead of the switch SW4.
You may make it switch to the side.

[0063]

As described above, according to the present invention, in a multi-drive elevator having a plurality of drive systems, passenger safety is given the highest priority when some of the drive systems fail. , It is possible to safely stop the car on the target floor using a sound (normal) drive system.

Further, according to the present invention, since the failed drive system is stored, after stopping the car at the destination floor,
It is possible to determine the presence / absence of a faulty drive system and, if there is a faulty drive system, perform processing such as prohibiting restart before returning to normal.

Further, according to the present invention, it is possible to shorten the restoration time by issuing an alarm to the elevator maintenance company or the monitoring center.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a control system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a multi-drive elevator to which the present invention is applied.

FIG. 3 is a diagram illustrating an effect of the present invention.

FIG. 4 is a flowchart illustrating a processing operation of a failure system determination procedure.

FIG. 5 is a flowchart illustrating a processing operation of a failure system disconnection procedure.

FIG. 6 is a flowchart illustrating a processing operation when a failure system determination procedure and a failure system disconnection procedure are combined.

FIG. 7 is a flowchart illustrating a processing operation of a stop floor setting procedure.

[Explanation of symbols]

 1 Failure system determination processing unit 2 Failure system separation processing unit 3 Stop floor setting processing unit 9 Speed control unit 21 Power supply 22, 23 Converter-inverter 24, 25 Motor 26 Sheave 27 Car basket 28 Balance weight 29, 30 PWM signal creation unit 31 rotary encoder 32 speed control system SW0 to SW4 changeover switch

Claims (8)

[Claims] 1. In an elevator operation control method driven by a plurality of drive systems, when a failure of any drive system is detected, output of a drive command to the failed drive system is stopped, and at the same time, speed control is performed. The control gain of the system or the torque command value obtained from the speed control system is multiplied by a predetermined number determined by the total number of drive systems and the number of failed drive systems, and the remaining sound drive systems are An operation control method for an elevator, characterized in that a drive command capable of generating the same driving force is created and the drive command is output to a sound drive system. 2. In an operation control method for an elevator driven by a plurality of drive systems, when a failure of any of the drive systems is detected, output of a drive command to the failed drive system is stopped, and at the same time, speed control is performed. The control command gain of the system or the torque command value obtained from the speed control system is multiplied by a predetermined number determined by the total number of drive systems and the number of failed drive systems, and the remaining sound drive systems have no failed drive system. Create a drive command that can generate the same driving force, output this drive command to a sound drive system, and use the sound drive system to drive and stop the car to the destination floor or the nearest floor that can be stopped. An elevator operation control method characterized by the above. 3. An elevator operation control method driven by a plurality of drive systems, comprising: a failure system determination processing unit and a failure system disconnection processing unit, wherein the failure system determination processing unit is When a failure is detected, the failed drive system is stored, and the failure system disconnection processing unit stops the output of the drive command to the drive system of the failure stored by the failure system determination processing unit, and at the same time, speed control is performed. The control gain of the system or the torque command value obtained from the speed control system is multiplied by a predetermined value determined by the total number of drive systems and the number of failed drive systems, and the remaining sound drive systems have no failed drive system. By creating a drive command that can generate the same driving force and outputting this drive command to a sound system other than the stored failure system, the failed drive system is separated and a healthy drive system is used to remove the car. Destination floor A method for controlling the operation of an elevator, which is characterized by driving up to and stopping. 4. In an operation control method for an elevator driven by a plurality of drive systems, when a failure of any drive system is detected, a car position and a car speed at that time and a deceleration when stopped are used. Calculate the floor that can be stopped safely and stop the output of the drive command to the failed drive system, and at the same time, set the control gain of the speed control system or the torque command value obtained from the speed control system to the total number of drive systems. Create a drive command that can generate the same driving force as the case where there is no failed drive system by multiplying by a predetermined number determined by the number of failed drive systems, and output this drive command to a healthy system. By doing so, a faulty drive system is separated, and a healthy drive system is used to drive and stop the car until the floor at which the car can be safely stopped. 5. An elevator operation control method driven by a plurality of drive systems, comprising a failure system determination processing unit, a stop floor setting processing unit, and a failure system disconnection processing unit,
The failure system determination processing unit stores a failure drive system when a failure of any drive system is detected, and the stop floor setting processing unit determines the car position and car speed at that time and the stop time. The floor that can be stopped safely is calculated using deceleration and is newly set as the target floor, and the failure system disconnection processing unit issues a drive command to the drive system of the failure stored by the failure system determination processing unit. At the same time as stopping the output of, the control gain of the speed control system or the torque command value obtained from the speed control system is multiplied by a predetermined number determined by the total number of drive systems and the number of failed drive systems, and the remaining healthy drive system is Create a drive command that can generate the same drive force as when there is no broken drive system,
By outputting this drive command to a sound system other than the stored failure system, the failed drive system is separated and the sound drive system is used to drive and stop the car to the newly set destination floor. An elevator operation control method characterized by the above. 6. The failure system disconnection processing unit is a predetermined multiple determined by the total number of drive systems and the number of failed drive systems, the total number of drive systems is N, and the number of failed drive systems is n.
6. The elevator operation control method according to claim 1, wherein when (N> n ≧ 0), it is determined as N / (N−n) times. 7. The elevator operation control method according to claim 2, wherein after the car stops on the floor, restarting of the car before the normal return is prohibited. 8. The elevator according to claim 1, wherein when a failure of any drive system is detected, the fact is notified to an elevator maintenance company, a monitoring center, or the like. Operation control method.