JPH04338072A - Elevator control device - Google Patents

Abstract

PURPOSE:To ease starting shock positively by correcting change with the elapsed time of the in-cage load detection value detected by a load detecting means after confirming the no-load state in a cage by a loaded state confirming means. CONSTITUTION:After the no-load state in a cage 1 is confirmed by a CCD camera 4 and an image processor 5 serving as loaded state confirming means, the flexural quantity of vibration-proof rubber 2 is detected by a differential transformer 3 to detect the load of the cage 1. The elapsed change of the differential transformer 3 is thereby corrected by a microcomputer 6 in relation to the elapsed change of output of the load in the cage 1 detected by the differential transformer 3. Accordingly, the correction to the elapsed change of load output is performed to improve the accuracy of weighed value and to ease starting shock resulting in the improvement of riding comfort.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control system, and more particularly, to an elevator control system that prevents overload of an elevator car and suppresses starting shock using the output of a weighing device that detects the load in the elevator car. This relates to a control device.

0002

BACKGROUND OF THE INVENTION Conventionally, elevators have been equipped with weighing devices that detect the load in the elevator car to ensure safety by preventing operation in an overloaded state where the elevator car is overloaded.
Further, by performing startup control according to the load, startup shock caused by differences in load is suppressed. A weighing device generally measures the load inside the elevator car by installing a detector such as a differential transformer under the elevator car and detecting the amount of deflection of an elastic body such as vibration-proof rubber that elastically supports the elevator car. I try to do that.

By the way, the amount of deflection of vibration-proof rubber, which is generally used to elastically support an elevator car, changes over time, and the output value of the weighing device changes accordingly, causing an error. Corrections are being made in a timely manner. However, this correction does not only have to be performed on the output when the car load is zero, but also on the rate of change of the output value with respect to the car load, that is, the ratio between the elevator car load and the output of the weighing device. Since the slope of the straight line when the relationship is shown on a graph also changes, it is also necessary to correct the rate of change of the output with respect to the load in the elevator car. For this reason, conventionally,
It was necessary to actually load and adjust the weight inside the elevator car, consuming a great deal of labor, time, and money.

[0004] Therefore, in order to easily perform the adjustment, a technique is disclosed in Japanese Patent Laid-Open No. 3-26673. The elevator control device according to the present invention multiplies the output of the weighing device when the car is loaded by a coefficient corresponding to the output of the weighing device when there is no load inside the car, and adds this multiplied value to the output of the weighing device when there is no load inside the car. It is equipped with a means to generate a scale signal for elevator start control by adding a bias value according to the output of the device, and automatically detects changes in the output of the scale device due to changes in the deflection of the vibration isolating rubber over time. Moreover, the amount of change can be corrected automatically. As a result, even if the output of the scale device changes due to changes in the anti-vibration rubber over time, it is possible to perform startup control with good ride comfort using the above-mentioned scale signal for elevator startup control.

[0005]

[Problems to be Solved by the Invention] By the way, the technology disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-26673 has a method for detecting when there is no load in the elevator car. It is assumed that there is no load inside the elevator car. but,"
Even if there are no calls in the elevator car and a predetermined period of time (3 minutes) has passed, if luggage or trolleys, etc. are left in the elevator car, the elevator car will be judged as unloaded even though there is actually a load. Therefore, even if a correction means is provided, there is a risk that a weighing error will occur instead. For this reason, it cannot be said that the reliability of ensuring safety through overload prevention and alleviating starting shock is sufficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an elevator control device that can improve the accuracy of correction for changes over time in the output of a weighing device by reliably detecting the no-load state in the elevator car. be.

[0007]

[Means for Solving the Problems] The elevator control device according to the present invention detects the load inside the elevator car detected by the load detection means after confirming that the inside of the elevator car is in a no-load state by the load state confirmation means. The correction means corrects changes in detected values over time.

[0008]

[Operation] In the present invention, since the load state confirmation means accurately determines that the inside of the elevator car is in a no-load state, the correction means is applied to the detected value of the load inside the elevator car detected by the load detection means. Corrected weighing accuracy is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a block diagram showing an elevator control device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a differential transformer in FIG. 1, and FIG. 3(a) is an image captured by the image processing device in FIG. An image diagram showing an image in a loaded state; (b) is an image diagram also showing an image in a loaded state.

In the figure, 1 is an elevator car, and 2 is an elastic body that is attached between a car frame (not shown) that holds the elevator car 1 from the outside and a floor plate of the elevator car 1, and elastically supports the elevator car 1. The swing rubber 3 is a differential transformer installed between the car frame and the floor plate of the elevator car 1. The differential transformer 3 is composed of a primary winding 3a, a secondary winding 3b, a secondary winding 3c, and a core 3d that moves up and down as the anti-vibration rubber 2 expands and contracts.
The load inside the elevator car 1 is detected by the sinking of the floorboard of the elevator car 1, that is, by the deflection of the vibration isolating rubber 2. 4 is a CCD camera using a charge-coupled device attached to the ceiling inside the elevator car 1, and 5 is an image processing device for processing images captured by the CCD camera 4. 6 is a microcomputer that controls the elevator;
A PU (central processing unit) 6a, a ROM (read only memory) 6b, a RAM (random access memory) 6c, a timer device 6d, and buses 6e such as an address bus and a data bus for connecting these are incorporated. 7 is AC power supply,
8 is a rectifier circuit that converts the alternating current output from the differential transformer 3 into direct current, 9 is an A/D converter that converts analog input to digital output, and 9a is a digital signal output from the A/D converter 9. It is connected to the bus 6e of the microcomputer 6.

Next, the operation of the elevator control device of this embodiment configured as described above will be explained. When a passenger gets into the elevator car 1, the vibration isolating rubber 2 is compressed and the core 3d of the differential transformer 3 moves downward. As a result, the reactance of the secondary winding 3b and the secondary winding 3c of the differential transformer 3 changes, and a difference occurs between the outputs of both windings to generate an output voltage. Next, the rectifier circuit 8 converts the alternating current output from the differential transformer 3 into direct current, and the A/D converter 9 converts the analog input into digital output, and then this digital signal 9a is sent to the microcontroller that controls the elevator. Send to computer 6.

On the other hand, the CCD camera 4 installed on the ceiling of the elevator car 1 captures the load condition inside the elevator car 1 as an image, and the image processing device 5 processes the image inside the elevator car 1 captured by the CCD camera 4. do. Currently, there are no passengers in elevator car 1, and there are no passengers in elevator car 1.
In the case of no load without a cart or the like, the image is as shown in FIG. 3(a). On the other hand, as described above, when two passengers board the vehicle, for example, the image shown in FIG. 3(b) is obtained. The image processing device 5 stores in advance the no-load state shown in FIG. 3(a), generates an output when the inside of the elevator car 1 becomes the same state as shown in FIG. 6 to transmit the output signal. Therefore, when a passenger is on board as described above, the image of the image processing device 5 captured by the CCD camera 4 does not match that shown in FIG. 3(a), so no output is generated.

Next, the procedure of the program operated by the microcomputer 6 will be explained based on the flowchart shown in FIG. 4 showing the operation of the elevator control device according to one embodiment of the present invention. This program corrects the detected value of the load in the elevator car 1 by taking in the detection signal output by the differential transformer 3 and the output signal from the image processing device 5 during normal elevator operation control, It is called when the timer device 6d operates to periodically perform repeated calculations.

First, in step S51, it is determined whether the elevator has stopped, and if it has stopped, step S52
Proceed to. In step S52, it is determined whether the inside of the elevator car 1 is in a no-load state based on the presence or absence of a signal from the image processing device 5. If there is no load, the process proceeds to step S53 and the output from the differential transformer 3, that is, the elevator car A digital signal 9a output from the differential transformer 3 corresponding to the load within 1 and input via the rectifier circuit 8 and the A/D converter 9 is input as Vn+1. Here, Vn+1 is shown as the current output, and Vn is shown as the output input using the same method last time. Next, in step S54, the previous output Vn and the current output Vn+1 are compared, and the difference is a predetermined value Ve.
If it exceeds the previous output Vn in step S55
is corrected to the current output Vn+1. Note that when the elevator car 1 is not stopped in step S51 and the inside of the elevator car 1 is not unloaded in step S52, the previous output Vn and the current output Vn are determined in step S54.
+1 is less than the predetermined value Ve, exits from this routine.

As described above, the elevator control device of the above embodiment confirms that the inside of the elevator car 1 is in a no-load state using the CCD camera 4 and the image processing device 5, which serve as load state confirmation means, and then uses the load detection means as a load detection means. The load on the elevator car 1 is detected by the differential transformer 3 detecting the amount of deflection of the vibration isolating rubber 2 installed between the floor plate of the elevator car 1 and the car frame, and the microcomputer 6 serving as a correction means This is to correct changes over time in the output of the differential transformer 3.

Therefore, according to the above embodiment, the CCD
Since the camera 4 and the image processing device 5 can reliably determine that the inside of the elevator car 1 is in a no-load state, the microcomputer 6 uses the time-dependent change in the output of the load inside the elevator car 1 detected by the differential transformer 3. The accuracy of the corrected weight value can be improved. As a result, it is possible to reliably prevent overload due to overcapacity and to improve riding comfort by alleviating the starting shock of the elevator car 1 without expending much effort, time, and expense.

By the way, in the above embodiment, the elevator car 1 is installed between the floorboard of the elevator car 1 and the car frame.
Although the vibration isolating rubber 2 is used as an elastic body that elastically supports the It is possible to detect the amount of compression and correct the weighed value due to changes over time. Further, in the above embodiment, the vibration isolating rubber 2 is attached between the floor plate of the elevator car 1 and the car frame, and the amount of compression is detected by the differential transformer 3. However, when implementing the present invention, For example, it can be similarly applied to a device configured to detect the displacement amount of the spring of the rope stop part of the car upper beam, or the displacement amount of the spring of the rope stop part in 2:1 roping, and the same effect can be obtained. You can expect it. Furthermore, other load detection means may be used in place of the differential transformer 3. Furthermore, in the above embodiment, the load condition inside the elevator car 1 is checked using the CCD camera 4 and the image processing device 5, but when implementing the present invention, the present invention is not limited to this, and the load condition inside the elevator car 1 is checked. Any means may be used as long as it can reliably detect the no-load state within the vehicle.

[0018]

As described above, the elevator control device of the present invention detects the load inside the elevator car by the load detecting means after confirming that the inside of the elevator car is in a no-load state by the load state checking means, and then detects the load in the elevator car by the load detecting means. Accordingly, the change over time of the detected value of the load detecting means is corrected. Therefore, since it can be reliably determined by the load state confirmation means that the inside of the elevator car is in a no-load state, the weight is corrected by the correction means for the change over time of the detected value of the load in the elevator car detected by the load detection means. You can improve the accuracy of values. As a result, it is possible to reliably improve riding comfort by preventing overload of the elevator car and alleviating starting shock without expending a great deal of effort, time, and expense.

[Brief explanation of drawings]

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

FIG. 2 is a configuration diagram showing the differential transformer in FIG. 1;

3(a) is an image diagram showing an image in a no-load state captured by the image processing apparatus in FIG. 1, and FIG. 3(b) is an image diagram similarly showing an image in a loaded state.

FIG. 4 is a flowchart showing the operation of an elevator control device according to an embodiment of the present invention.

[Explanation of symbols]

1 Elevator car 3 Differential transformer 4 CCD camera 5 Image processing device

Claims (1)

[Claims] 1. A load state confirmation means for confirming that the inside of the elevator car is in a no-load state, a load detection means for detecting a load in the elevator car, and a load state confirmation means for confirming that the inside of the elevator car is in a no-load state. and a correction means for correcting a change over time in a load detection value in the elevator car detected by the load detection means after confirming that the load detection means is correct.