JP2002284460A - Abnormality detecting device for speed detector in elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detecting device for a speed detector in an elevator capable of securely detecting abnormality in the speed detector without detection errors. SOLUTION: When the elevator is started by automatic operation, start of it from a door zone is recognized based on a start command signal generated from a seed control means, a door zone detection signal to indicate a possible door opening/closing position of the elevator, and a speed detection signal outputted from the speed detector. As the speed detection signal is below a specified value, and when it is recognized that a car is outside the door zone, it is determined as abnormality in the speed detector. When the elevator is started by manual operation, an abnormality detection time limit is set based on cage load quantity by a cage load detector and a start direction generated from the speed control means, and when the speed detection signal is less than a specified value at the abnormality detection time limit after starting, it is determined as abnormality in the speed detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device, and more particularly to a device for detecting an abnormality of a speed detector in an elevator.

[0002]

2. Description of the Related Art FIG. 7 is a simplified view of a conventional speed detector abnormality detection device in an elevator disclosed in Japanese Patent Application Laid-Open No. H6-1100254. In the figure, 21
Is a car that runs on the hoistway of the elevator. The car 21 is suspended in a sheave 24 from a sheave 24 by a rope 23 having a counterweight 22 attached to the other end.

The sheave 24 is connected to an elevator driving motor 25 and a brake 26 by a rotating shaft. The elevator driving motor 25 has a rotary encoder (speed detector) that generates a pulse in response to the rotation of the motor 25. 27 are connected. Reference numeral 28 denotes an elevator control device that controls the operation of the elevator, and 29 denotes a speed detector abnormality detection device that detects an abnormality of the rotary encoder 27.

A control device 28 for controlling the operation of the elevator
The brake 26 is released and the electric motor 25 is rotated in response to the start command signal to drive the car 21. At this time, a pulse is output from the rotary encoder 27 connected to the electric motor 25, and the abnormality detection device 29 turns on the speed detection signal when the number of pulses during the predetermined period has exceeded a predetermined value.

An abnormality detecting device 29 compares an operation time difference between a start command signal from the control device 28 and the speed detection signal with a predetermined abnormality detection time limit value, and when a deviation from the predetermined time limit value is large, a speed detector (encoder). Is detected.

[0006]

A conventional abnormality detecting device for a speed detector in an elevator is constructed as described above. At the time of starting, the speed detecting device detects the abnormality of the speed detector based on an operation time difference between a start command signal and the speed detection signal. An abnormality was determined.

However, since the operating time difference between the start command signal and the speed detection signal at start-up varies depending on the load state and the driving direction in the car, the operating time difference is required to accurately detect the abnormality of the speed detector. It is necessary to detect an abnormality after a lapse of a specified time period from the start so as not to be affected by the variation due to.

That is, in this case, the abnormality detection is compared when the speed reaches the predetermined speed. Therefore, if the speed cannot be detected due to the failure of the speed detector, the abnormality cannot be detected promptly.

Therefore, when there is no output from the speed detector due to the abnormality of the speed detector, the control device for controlling the operation of the elevator attempts to make the speed of the elevator follow the speed command value by the deviation. The elevator driving motor is rotated at a higher speed. Therefore, there is a problem that the elevator rapidly accelerates from the start to the start of the abnormality detection.

Further, in order to start abnormality detection of the speed detector early and to avoid erroneous detection, a high-accuracy speed detector and a microcomputer with a high calculation speed are required. For this reason, there is a new problem that the cost of the elevator increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not require a high-accuracy speed detector or a microcomputer having a high calculation speed. It is an object of the present invention to provide an abnormality detection device for a speed detector in an elevator that can detect the abnormality at a speed.

[0012]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention calculates a car operation torque command based on a deviation between a car speed command and an actual car speed detected by a speed detector. An abnormality detection device for a speed detector in an elevator for controlling the speed of a car, wherein the abnormality detection device for a speed detector in the elevator detects an abnormally low speed of the car at a predetermined distance after the start of the car.

A door zone detector for detecting an openable / closable position of the door of the elevator, and a speed detection signal from the speed detector when the car is removed from the door zone from the door zone by the door zone detector. The abnormality detection of a speed detector in an elevator according to claim 1, further comprising first speed detector abnormality detection means for detecting that the speed detector is abnormal when the value is less than a predetermined value. In the device.

An abnormality detection of a speed detector in an elevator for calculating a car operation torque command based on a deviation between a speed command to the car and an actual speed of the car detected by the speed detector and controlling the speed of the car in accordance with the calculated torque command. An abnormality detection device for a speed detector in an elevator, wherein the device detects an abnormally low speed of a car after a predetermined time based on a time period set according to a car load after the start of the car.

Further, an in-car load detector for detecting a load in the car, and an abnormality detection time variable for setting an abnormality detection time of the speed detector in accordance with the load detection amount obtained from the in-car load detector. The speed detector is abnormal when the speed detection signal from the speed detector is less than a predetermined value after the time set by the abnormality detection time variable setting device has elapsed since the setting means and the elevator started. Second to detect
The abnormality detecting device for a speed detector in an elevator according to claim 3, further comprising a speed detector abnormality detecting means.

According to the first aspect of the present invention, the abnormality detecting device for the speed detector in the elevator detects that the speed detection signal is less than a predetermined value, for example, when it is recognized that the vehicle is started from the door zone by automatic operation. When it is recognized that the vehicle is outside the door zone, an abnormality of the speed detector is detected.

According to a second aspect of the present invention, there is provided an elevator speed detecting apparatus for detecting an abnormality of a speed detector, wherein the elevator control apparatus is activated, for example, by manual operation, after an abnormality detecting time period set in accordance with a detected amount of load in a car has elapsed. When the speed detection signal is less than a predetermined value, an abnormality of the speed detector is detected.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing an abnormality detection device for a speed detector in an elevator according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a door zone detector that detects an openable / closable position of an elevator installed in an elevator car, and 2 denotes a speed detector that detects a traveling speed of the car.

3 is a microcomputer for controlling the operation of the elevator. 4 is a microcomputer for calculating a torque command for operating the car based on a deviation between a speed command generated for the car and an actual speed detected by the speed detector 2. Speed control means of the elevator for performing speed control, 5 is a start detection means in the door zone for detecting start of the car from the door zone, 6 is a speed detection signal indicating a traveling speed of the car from the speed detector 2 is less than a predetermined value. A first speed detector abnormality detecting means for detecting an abnormality of the speed detector 2 by detecting that the car has escaped out of the door zone in the state of.

Reference numeral 7 denotes a sudden stop command generating means for urgently stopping the car in response to the abnormality detected by the first speed detector abnormality detecting means 6, and 8 designates an abnormal detection by the first speed detector abnormality detecting means. This is a start prevention command generating means for receiving the next travel and preventing the next running.

FIG. 3 is an operation flowchart of the abnormality detecting device according to the first embodiment of the present invention, and the operation will be described below according to the flowchart.

In step S1, based on the start command signal issued by the speed control means 4, if it is before the start, the process proceeds to step S2, and if it is after the start, the process proceeds to step S7.

In step S2, the door zone detector 1 determines whether the car is currently stopped inside or outside the door zone. If the car is stopped inside the door zone, step S3 is performed.
And turn on the signal DZSTART indicating that the next run is started from within the door zone (signal data is set to "1").
), And proceeds to step S5. If the vehicle has stopped outside the door zone, the process proceeds to step S4, and DZSTART is turned off.
(The signal data is set to “0”), and the process proceeds to step S5.

On the other hand, if it is after startup, in step S7,
It is determined by DZSTART whether the operation is started from the door zone. If the operation is started from the door zone, the process proceeds to step S8. If the operation is started from the outside of the door zone, the process proceeds to step S11.

In step S8, the door zone detector 1 determines whether the car is currently inside or outside the door zone. If the car is outside the door zone, the process proceeds to step S9. .

In step S9, it is determined whether or not the speed detection signal VT output from the speed detector 2 is smaller than a predetermined value α (α is a very small value). If it is not less than α, the process proceeds to step S11.

In step S10, the speed detector 2 detects that the car has started up from the inside of the door zone and the car has moved out of the door zone. It is determined that there is no output due to occurrence of, and the abnormality detection signal ENCFAIL is turned on (signal data is set to "1"), and the process proceeds to step S11.

In step S11, it is determined whether an abnormality of the speed detector 2 has been detected. If ENCFAIL is on, the process proceeds to step S12, and if ENCFAIL is off, the process ends.

In step S12, an abnormality of the speed detector 2 is detected, and if the vehicle continues to travel further, the elevator may continue to abnormally increase in speed. Command.

In step S5, it is determined whether an abnormality of the speed detector 2 has been detected. If the speed detector 2 is in an abnormal state, it is impossible to run normally, so if the abnormality detection signal ENCFAIL is on, a command is issued to the start prevention command generation means 8 to prevent the start of the elevator.

Here, steps S2, S3 and S4 are executed by the door zone activation detecting means, and steps S7, S8, S9 and S
Reference numeral 10 denotes a first speed detector abnormality detecting means, which is provided in step S1.
Steps S1 and S12 correspond to the sudden stop command generation means.
Reference numeral 6 denotes a start prevention command generating means, which can detect an abnormality of the speed detector without comparing the operation time difference between the start command signal and the speed command signal with a predetermined value, and reliably detect the speed detector without erroneous detection. Can be detected.

It should be noted that, due to disconnection of the output of the speed detector, etc.
Although the case where the speed is increased but the detected value of the speed is small has been described as an example, a case where sufficient acceleration cannot be performed due to some overload or a malfunction of the drive control system can be detected.

Further, in the above-described embodiment, the abnormality detection is performed at the end of the door zone by starting from inside the door zone. However, the invention is not limited to this. In this case, for example, a car position detector (not particularly shown) is provided instead of the door zone detector 1.

Embodiment 2 FIG. 2 is a block diagram showing an abnormality detection device for a speed detector in an elevator according to a second embodiment of the present invention. In FIG. 2, 2, 3,
4 and 7 correspond to those of the first embodiment.

Reference numeral 9 denotes an in-car load detector for detecting a load in the car installed in the elevator car, and 10 denotes an abnormality of the speed detector 2 in accordance with the detected amount of the in-car load from the in-car load detector 9. The abnormality detection time variable setting means 11 for setting the detection time is configured to detect that the speed detection signal from the speed detector 2 is less than a predetermined value after the time set by the abnormality detection time variable setting means 10 elapses. It is a second speed detector abnormality detecting means for judging abnormality of the speed detector 2.

FIG. 4 is an operation flowchart of the abnormality detecting device according to the second embodiment of the present invention, and the operation will be described below according to the flowchart. Although this operation is not shown, it is particularly effective when starting the manual operation.

In step S21, based on the start command signal issued from the speed control means 4, the process proceeds to step S22 if before the start, and to step S23 if after the start.

In step S22, the in-car load detector 9
The abnormality detection time period TM of the speed detector 2 is set based on the car internal load amount and the operating direction of the elevator.
This will be described in detail later.

In step S23, it is determined whether or not the elevator is decelerating. If the elevator is decelerating, the process proceeds to step S22. If not, the process proceeds to step S24.

In step S24, the abnormality detection time period TM set in step S22 is counted down every operation cycle of the operation control microcomputer 3, and the count value is set in step S2.
Go to 5.

In step S25, if the time period counted down in step S24 becomes 0 or less, step S2 is executed.
The process proceeds to step S6, and if the time limit is 1 or more, the process proceeds to step S28.

In step S26, it is determined whether or not the speed detection signal VT output from the speed detector 2 is smaller than a predetermined value α. If the speed detection signal VT is smaller than the predetermined value α, the process proceeds to step S27. Proceed to S28.

In step S27, since the speed detection signal is less than the predetermined value after the abnormality detection time set in accordance with the detected car internal load has elapsed, the speed detector 2
It is determined that some abnormality has occurred in the
CFAIL is turned on (signal data is set to "1"), and the process proceeds to step S28.

Steps S28 and S29 are the same as steps S11 and S12 in FIG.

Next, the speed abnormality detection time period T in step S22
An example of the setting of M will be described with reference to FIG.

In step S31, based on the start command signal issued from the speed control means 4, if the direction to be started is the Up direction, the process proceeds to step S36, and Down is performed.
If so, the process proceeds to step S32. If there is no start direction, the process exits from this flowchart.

In step S32, the in-car load detector 9
If more than the difference between the load W _BL of loading of the input-car load W _G and the car is in the car in a state that a balanced and counterweight -β (β> 0) Step S
34, if it is equal to or more than -β and equal to or less than β, step S33
If it exceeds β, the process proceeds to step S35.

At step S33, the load in the car is
It is in a state of being almost balanced with the
Set the error detection (start) time limit TM to_M(TM_S<TM_M<
TM _L).

In step S34, since the elevator is operated in the descending direction with no load in the car, that is, traveling in the heavy load direction, the elevator is difficult to move, and the operation time difference between the start command signal at start-up and the speed detection signal is large. Therefore to avoid abnormal detection start timing TM erroneous by setting the longer TM _L detection, it is possible to detect reliably the speed detector 2 made of an encoder or the like abnormality.

In step S35, since the elevator travels in the light load direction, the elevator is easy to move, and the operation time difference between the start command signal at start-up and the speed detection signal is small. Therefore abnormality detection
(Start) during the timed TM from the startup by setting the short TM _S until the start of the abnormality detection is shortened, while the elevator is reliably detect the abnormality of the encoder before the high and rapid acceleration speed It is possible to do.

On the other hand, in step S36, step S3
2 and the car body burden W _G input from the load detector 9 Kako similarly to, the difference between the load W _BL in the car in a state in which loading of the car is well-balanced with the counterweight −β
If less than (β> 0), the process proceeds to step S38. If −β or more and less than or equal to β, the process proceeds to step S37.

[0052] At step S37, a state in which loading of the car is well-balanced with the counterweight, as well as abnormality detection (start) and step S33 to set the timing TM to TM _M.

[0053] At step S38, the direction of upward pulled counterweight, i.e. likewise the abnormality detection and the step S35 for traveling in the light load direction (start) to set a timed TM short time period of TM _S.

[0054] In step S39, similarly abnormality detection (start) and step S34 for traveling in the heavy load direction to raise the heavy car to set a timed TM long timed TM _L.

It should be noted that, unlike the normal operation, the manual operation does not start the contract weighing by taking in the weighing signal at the time of starting.
As shown in FIG. 6, following the speed pattern can be sent until a torque command is issued at the time of startup by a speed deviation corresponding to the scale deviation. A shows a state of a full load drop state and a no-load rise state, and B shows a state of a full load rise state and a no-load fall state.

Therefore, when the speed check is performed on the basis of the elapsed time, an erroneous detection occurs unless the check time is delayed or advanced as the scale deviation increases. In particular, in the case of the state of FIG. 6A, for example, when the speed detection is zero, the speed increases more rapidly, so it is necessary to detect the speed as soon as possible.

In the state shown in FIG. 6B, the vehicle may run backward once, and if the detection time is early, erroneous detection of checking the reverse running occurs.

Therefore, this embodiment is particularly effective for manual operation.

Step S22 in the operation flowchart of FIG. 4 according to this embodiment uses the abnormality detection time variable setting means as steps S23, S24, S25, S26 and S27.
Indicates the second speed detector abnormality detecting means in steps S28 and S28.
Reference numeral 29 designates a sudden stop command generating means, which can detect an abnormality of the speed detector without comparing the operation time difference between the start command signal and the speed command signal with a predetermined value, and can surely detect the speed detector without erroneous detection. Can be detected.

[0060]

According to the first aspect of the present invention, for example, when it is recognized that the vehicle is started from inside the door zone by automatic driving, the speed detection signal is less than the predetermined value and the car is outside the door zone. When the speed detector is recognized, the speed detector is detected as abnormal, so when compared with the abnormality detection using a value that varies depending on the load condition and operation direction in the car, the speed detector can be reliably detected without erroneous detection. Abnormality can be detected.

In the second invention, for example, when the speed detection signal is less than a predetermined value when the speed detection signal is less than a predetermined value after the abnormality detection time set in accordance with the detected load in the car has elapsed, for example, when the vehicle is started in the manual operation. Since the device is detected as abnormal, it is possible to reliably detect the abnormality of the speed detector without erroneous detection due to a variation in the starting time due to the load state in the car or the driving direction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an abnormality detection device for a speed detector in an elevator according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing an abnormality detection device for a speed detector in an elevator according to a second embodiment of the present invention.

FIG. 3 is an operation flowchart of the abnormality detection device according to the first embodiment of the present invention.

FIG. 4 is an operation flowchart of the abnormality detection device according to the second embodiment of the present invention.

FIG. 5 is an operation flowchart of an abnormality detection time varying means of the abnormality detection device according to the second embodiment of the present invention.

FIG. 6 is a diagram for explaining an abnormality detection time limit variable according to a second embodiment of the present invention.

FIG. 7 is a block diagram illustrating a conventional abnormality detection device.

[Explanation of symbols]

1 door zone detector, 2 speed detector, 3 operation control microcomputer, 4 speed control means, 5 door zone start detection means, 6 first speed detector abnormality detection means, 7 sudden stop command generation means, 8 start prevention command generation Means, 9 car load detector, 10 abnormality detection time limit variable setting means, 11 second speed detector abnormality detection means.

Claims (4)

[Claims] 1. An abnormality detection of a speed detector in an elevator that calculates a car operation torque command based on a deviation between a speed command to the car and an actual speed of the car detected by the speed detector and controls the speed of the car in accordance with the calculated torque command. An apparatus for detecting an abnormality of a speed detector in an elevator, wherein the apparatus detects an abnormally low speed of a car at a predetermined distance after the start of the car. 2. A door zone detector for detecting an openable / closable position of an elevator, and a speed detection signal from the speed detector when the car is removed from the door zone by the door zone detector. The abnormality detection of a speed detector in an elevator according to claim 1, further comprising: first speed detector abnormality detection means for detecting that the speed detector is abnormal when the value is less than a predetermined value. apparatus. 3. An abnormality detection of a speed detector in an elevator which calculates a car operation torque command based on a deviation between a speed command to the car and an actual speed of the car detected by the speed detector and controls the speed of the car in accordance with the calculated torque command. An apparatus for detecting an abnormality of a speed detector in an elevator, wherein the apparatus detects an abnormally low speed of a car after a predetermined time based on a time period set according to a car load after the start of the car. 4. An in-car load detector for detecting a load in the car, and an abnormality detection time variable for setting an abnormality detection time of the speed detector according to a load detection amount obtained from the in-car load detector. Setting means, and when the speed detection signal from the speed detector is less than a predetermined value after a time period set by the abnormality detection time variable setting means after the elevator is started, there is an abnormality in the speed detector. The abnormality detecting device for a speed detector in an elevator according to claim 3, further comprising: a second speed detector abnormality detecting means for detecting the abnormality.