JPH0312715A - Water supply controller - Google Patents

Abstract

PURPOSE:To collectively monitor and control an entire water supply system by transferring the signals between a central controller and a local controller IC. CONSTITUTION:The data on the valve opening amount, etc., which are collected by an IC 8 at each fixed time interval are periodically fetched by a central controller 18. That is, the controller 18 sends a transmission request command to the LC 8 via the communication systems 19, 20 and 17 respectively. Then the LC 8 sends various data on the pressure given from a sensor for a control valve, the valve opening amount, the differential pressure, the flow rate calculated from the differential pressure, etc., to the controller 18. The controller 18 stores these received data into a floppy device 21 and displays a bar graph, a broken line graph, etc., via a printer 22. These operations are applied to plural LC 8a - 8n. As a result, the controller 18 can monitor collectively the data.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a water distribution control device for waterworks and the like.

2. Description of the Related Art When controlling water distribution by controlling the flow rate and pressure of a water distribution channel such as a conventional water supply channel, a control valve is provided in the distribution channel, and a control device for controlling the control valve is attached to the control valve. Generally, they are provided in a corresponding manner. Then, in order to supply water from one water distribution source to multiple water distribution areas,
A control valve and a control device are provided for each water distribution section. The control device is capable of collecting data regarding the control valve and the water distribution channel, for example, data such as valve opening, flow rate, and pressure. Further, the control device can control the control valve in a plurality of control modes, such as opening degree control, flow rate control, and pressure control, and one of the modes is selected. Which mode to select is determined based on the above data.

Problems that the invention aims to solve However, with conventional systems like this, data is collected individually for each water distribution area, so it is said that it is important for the country to monitor the entire water distribution system at once. There are problems. In addition, since the control mode and control amount settings are changed individually for each control device, an operator must go to the installation location of each control device when retrieving control records or performing manual operations. There is also the problem that it does not.

Therefore, the present invention aims to solve these problems and to enable monitoring and control of the entire water distribution system at once.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a control valve provided in a distribution channel; a local controller that is capable of collecting data regarding the control valves and water distribution channels; and provided corresponding to a plurality of local controllers.

It is possible to receive the collected data from each local controller, and to execute a calculation for controlling the control valve via the local controller from the received data, based on the result of the calculation in parentheses. The present invention has a central control device capable of transmitting a command for changing the control mode and a command for changing the control amount setting in each control mode to the local controller.

Effect: According to this configuration, data such as valve opening, flow rate, pressure, etc. collected by the local controller is sent from the local controller to the central control device. The central controller performs calculations based on the received data,
Based on this calculation result, a change command is sent to the local controller. Based on the received change command, the local controller changes the control mode and the control amount. In this way, communication between each local controller and the central control device allows the entire water distribution system to be controlled. Monitoring and control will be performed all at once.

Embodiment FIG. 5 shows an example of a local controller in a water distribution control device based on the present invention. Here, 1 is a distribution channel for water supply, and is capable of supplying water supply 3 to demand area 2. A control valve 4 using a multi-hole variable orifice valve is provided in the water distribution channel 1, and a pressure difference between the flow side and the downstream side of the control valve 4 is detected at a position adjacent to the control valve 4. A differential pressure sensor 5 is provided for this purpose. The control valve 4 is also provided with an opening sensor 6 for detecting the opening of the control valve 4. A pressure sensor 7 for detecting water pressure in the distribution channel 1 is provided in the distribution channel 1 on the downstream side of the control valve 4 .

8 is a local controller using a computer,
Signal lines from each sensor 5, 6.7 are connected. A valve control circuit 11 is connected to the opening/closing control output terminal 9 of the local controller 8 via an automatic/manual changeover switch 10 . This valve control circuit 11 receives an automatic control signal from the local controller 8 or a manual control signal from the manual switch 12, and can adjust the opening degree of the control valve 4 based on these control signals. Further, the valve control circuit 11 receives a fully open signal and a fully closed signal from the control valve 4, and
This can be supplied to the input terminal 13 of the local controller 8. The local controller 8 is connected to a commercial power source 14.
．． A console 15 for remote control and an output printer 16 for displaying data are connected.

FIG. 4 schematically shows the overall configuration of a water distribution control device based on the present invention. Here, 8a, . . . , 8n are local controllers similar to those in FIG. 5, and modems 17ae, . . . , 17n, also shown in FIG. 5, are connected. Reference numeral 18 denotes a central control device composed of a host computer, and each local controller 8a.

...8n modems 17a, ...17n are connected to corresponding modems 19a, ...19n, respectively.

Modems 19a, . . . 19n and modems 17a, . . . 1
7n can be connected to each other via telephone lines 20a, . . . 20n.

The central control unit 18 includes a floppy device 2 for storing data.
1, a printer 22 for data output, and an input/output device 23 for system expansion are connected.

Next, the central controller 18 and the local controller 8
This section explains the water distribution control procedure. FIG. 1 shows the control flow in the central controller 18. As shown in FIG.

First, in step 31, a measurement and control routine for water distribution control is started, and in step 32, initial settings of the device and job selection for this total 8111 control are performed.

Next, data such as the valve opening degree collected by the local controller 8 is taken into the central controller 18. This import work is performed periodically at regular time intervals. That is, first, in step 3:3, it is determined whether the time corresponding to the fixed period for data reception has elapsed. If this time has not elapsed, this step: wait for the time to elapse by cycling through the loop around 'I3.

If the time corresponding to the fixed period has elapsed, step 34
Then, data is received from the local controller 8.

At this time, the central control device 18 sends a transmission request command to the local controller 8 via the communication system shown in FIG. Then, the local controller 8 collects various data such as pressure, valve opening, differential pressure, and flow rate calculated from the valve opening and differential pressure, which are collected through the sensors 5, 6, and 7 shown in FIG. The data is sent towards the central control bag [18]. In step 35, the central control unit 18 performs processing such as storing the received data on the floppy disk 21 shown in FIG. 4 and displaying it on the printer 22 or other display device. Data display methods include trend display using bar graphs, system diagrams, list charts, and line graphs.

A plurality of local controllers 8a,
...8n, the central controller 18
The data is monitored all at once.

Next, the local controller 1 and roller 8 are controlled by the central controller 18.
control is performed. Note that the local controller 8 can control the control valve 4 in a plurality of control modes such as opening control, pressure control, and flow rate control, and can selectively execute one of these control modes. Further, the control amount of each control mode, for example, the pressure setting value in pressure control, can be changed.

First, in step 36, the local controller 8 is automatically controlled by the central controller I8, or the central controller 1
-F to 8 - Select whether to perform manual control based on labor force. When manual control is selected, in step 37, based on the data obtained in step 34, the aforementioned force control modes 1 to 1 are selected and the control amount in the control mode 1 is set or changed.

And once this manual control is completed, step: (3
Return to

If automatic control is selected, calculations for automatic control are performed in step 38. Here, based on the data obtained in step 34, it is determined whether it is necessary to change the control mode, change the set value of the control amount, etc. When it is determined that such a change is necessary, a change operation is performed in step 39, and the change controller is sent to the local controller 8. The local controller 8 changes the control mode and changes the control amount settings based on the received command, and starts control based on the changed control mode. The local controller 8 also transmits data regarding mode changes and the like to the central controller 18. The central control unit 18 checks the changes in step 40. Once the check is complete, step 33
Return to

FIG. 2 shows this automatic control routine in detail. When the automatic control routine is started in step 51, first in step 52 the flow rate value is checked. That is, the data of the current flow rate sent from the local controller 8 to the central control bag [+8] at step 34 in FIG.
It is compared with its upper and lower limits. Then, in accordance with the comparison results, the work of setting and resetting flags in the CPU constituting the central control unit 18, such as setting the corresponding flag when the current flow rate value exceeds its upper limit, is carried out. This is done in step 53.

Similarly, the pressure value is checked in step 54, and the valve opening degree is checked in step 56.

And correspondingly, step 55 and step 5
At step 7, flags are similarly set and reset.

In addition to the above, the local controller 8 calculates the cumulative flow rate of the distribution channel 1 and stores the value.

Therefore, in step 58, this integrated flow rate is checked. If the integrated flow rate exceeds the -L limit value.

At step 59, the corresponding flag is set. When this flag setting is performed, the stored cumulative flow rate value is reset to O, and flag cellar 1~ is performed. - Applicable in cases where daily water intake is regulated by cumulative amount.

In waterworks, the flow rate ratio between daytime and nighttime is l
It tends to be as large as O:1 to 20:1.

Therefore, by measuring the current time, the central control device 18 can perform processing such as changing the control mode depending on the time zone. Therefore, in step 60, it is checked to which time zone of the day the current time belongs. Then, in step 61, the flag for the relevant time period is set and the others are reset.

Next, in step 62, it is determined whether conditions for changing the control mode or changing the set value are satisfied. That is, it is determined whether the combination of each of the above-mentioned flags and the current control mode matches a preset combination for change. If they do not match, it is determined that the conditions for the change are not satisfied, and the process proceeds to step 63 to end this routine. If they match, proceed to step 64, calculate the setting value to be changed,
Predetermined calculations are performed to determine the control mode, reset the integrated flow rate, and the like.

Step 65 is the same as step 39 in FIG.
Specifically, commands to change control modes and set values.

And if it is necessary to reset the cumulative flow rate, a reset command is sent to the local controller 8. Then, in step 66, after receiving data regarding changes from the local controller 8 and checking the changes,
Proceeding to step 67, this routine ends.

FIG. 3 shows the control flow in the local controller 8. Here, when the process is started in step 71, the process proceeds to step 72, and each sensor 5,
Data is read from 6 and 7. Then, in step 73, calculations are performed on the read data, and in step 74, the calculation results are displayed on the output printer 16 or the like as pressure values, opening values, etc.

Next, in step 75, it is determined whether or not there is a transmission request from the central control device 18. If there is no transmission request, the process advances to step 77. If there is a transmission request, the process advances to step 76, and the above data is sent to the central controller 1.
8. The local controller 8 also performs self-diagnosis based on the measured data, and the local controller 8 performs self-diagnosis based on the measured data.
Now, self-diagnosis information, i.e., predetermined alarms, in the central control unit! Send to 8.

For example, if the flow rate exceeds a certain level, it is determined that the piping is damaged, and measures such as emergency shutoff of the control valve 4 are taken.

Thereafter, the process proceeds to step 77, where it is determined whether there is a request from the central controller 18 to change the control mode or the like.

If there is no change request, the process advances to step 79. When there is a change request, the process proceeds to step 78, where one of the following steps is performed: changing the control mode, changing the set value, resetting the integrated flow rate, etc.
Execute the item you requested to change or reset. Then, the process advances to step 79.

The control valve 4 is controlled by the local controller 8 periodically at regular time intervals. So step 7
In step 9, it is determined whether this certain period of time has elapsed.

If this time has not elapsed, the process returns to step 72. When the time has elapsed, control calculations are executed in step 80 based on the data read in step 72. Then, in step 81, a control output is issued to control the control valve 4 via the valve control circuit 11 shown in FIG.

Note that the command data sent and received between the central control device 18 and the local controller 8 is not limited to the above-mentioned data. For example, as a signal to be sent from the central controller 18 to the local controller 8, control parameters such as set values, i'J
-iF, control period, etc. can be adopted.

Effects of the Invention As described above, according to the present invention, since signals are sent and received between the central control device and the local controllers, monitoring and control of the entire water distribution system can be performed at once by the central control device. With each Royal Con! - The roller allows the control valve to be controlled with an appropriate control motor and set value.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the control flow of the central control device in a water distribution control device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the main part of the flowchart in FIG. 1 in more detail, and FIG. A flowchart showing the control flow of a local controller in a water distribution control device according to an embodiment, FIG. 4 is a schematic diagram showing the overall configuration of a water distribution control device according to an embodiment of the present invention, and FIG. FIG. 2 is a schematic diagram showing the surroundings of a controller and a control valve. 1... Distribution channel, 4... Control valve, 5... Differential pressure sensor, 6... Opening sensor, 7... Pressure sensor, 8, 8a
, 8n... Local controllers 1 to rollers, 18... Central control unit, 20a, 20n... Telephone line.

Claims (1)

[Scope of Claims] 1. A control valve provided in a water distribution channel; a control valve provided corresponding to the control valve, capable of controlling the control valve in a plurality of alternative modes; A local controller capable of collecting data regarding distribution channels, and a local controller provided corresponding to a plurality of local controllers, capable of receiving the collected data from each local controller, and transmitting data from the received data via the local controller. capable of executing a calculation for controlling the control valve, and transmitting to the local controller a command for changing the control mode and a command for changing the setting of the control amount in each control mode based on the result of the calculation; A water distribution control device characterized in that it has a central control device capable of controlling the water.