JPS61141002A - Control system - Google Patents

Abstract

PURPOSE:To improve the responsiveness with a controlled system by ensuring the simultaneous start and stop of each device of the controlled system within the load variation allowable capacity and within a load variation allowable range and at the same time setting the control time interval for each device. CONSTITUTION:The cool/hot water is sent from a heat source device via a header by plural pumps and supplied to an air conditioning load via a header. Those pumps are started and stopped by a controller which consists of interfaces I/F1-I/F4, a fixed memory ROM, a variable memory RAM, a timer TM, etc. centering on a processor CPU. The control signal is sent to the pump from the I/F4. Then the maximum number of devices which are started and stopped simultaneously are decided in response to the load variation allowable capacity of the receiving facilities and the variation allowable range of a controlled system. The simultaneous start/stop control is carried out with the number of devices under said maximum number. The start/stop time interval is decided for each device of the controlled system in consideration of the change of the control state, the response characteristics, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a control method applied when starting and stopping control of various controlled devices such as motors, pumps, refrigerators, heaters, etc. is in danger. It is related to.

[Conventional technology]

For example, when starting or stopping multiple water pumps for air conditioners, depending on the capacity and voltage fluctuation characteristics of the power receiving and substation equipment, distribution equipment, and distribution equipment,
In order to suppress inrush current and keep voltage fluctuations below a certain value, each unit is started or stopped one by one at fixed time intervals.

[Problem that the invention seeks to solve]

However, in the conventional method, even if the load fluctuation tolerance such as power reception capacity and voltage fluctuation characteristics is less than the tolerance, and the disturbance corresponding to the control of the controlled system is within the fluctuation tolerance,
Since each unit is started and stopped at regular intervals, it takes a long time to change the operating status of multiple units, resulting in a delay in the control response of the air conditioning status. ing.

Note that this applies not only to power receiving, substation, and distribution equipment, but also to boilers,
A similar problem arises regarding the relationship with energy sources involved in the operation of various devices to be controlled, such as compressors.

[Means for solving problems]

The present invention has the purpose of fundamentally solving the problems of the conventional art, and in order to achieve this purpose, it is constructed by the following means.

In other words, the maximum number of simultaneous startups and the maximum number of simultaneous stops of the target equipment are determined according to the load fluctuation tolerance capacity of the energy source involved in the operation of the target equipment and the variation tolerance range of the controlled system, and one start control and stop control are also carried out. The time intervals are determined for each individual device, and after each time interval has elapsed, the target devices are controlled according to the maximum number of simultaneous activations and the maximum number of simultaneous stops.

[Effect]

Therefore, the target devices are started and stopped simultaneously within the load fluctuation tolerance of the energy source and within the fluctuation tolerance of the controlled system, and the time intervals between startup control and shutdown control are individually set. By optimizing the time interval and simultaneously starting and stopping the devices, responsiveness in control via the target equipment is improved.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 2 is an instrumentation diagram of a water pump group for an air conditioner. Cold and hot water W is supplied from the heat source equipment (not shown in the diagram) via the header H.
1 is pressure-fed by a plurality of pumps P, ~Pn, and sent to the air conditioning load as water supply Wr via a header Ml.
Starting and stopping are controlled by K.

In addition, the control device CNT sends and receives data to and from a host device (not shown in the figure) via a transmission path, and uses control calculations corresponding to received control commands and detected forces from various sensors S. The control output is determined to control the pumps P1 to Pn and the various actuators AC.

FIG. 3 is a block diagram of the control device CNT, which mainly includes a processor such as a microprocessor, an interface I/F+ = I/Fa, and a fixed memory ROM.
, variable memory RAM, oscillator OSC for clock pulse generation, and timer TM are arranged around the periphery.
A terminal device TB consisting of a display device, a keyboard, etc. is connected via the interface I/F, and a transmission path is connected via the interface I/F for sending and receiving. Actuator AC and sensor S are connected, while control signals for pumps P, -Pn are sent from interface I/Fa.

In this, processor CPU Fi, oscillator O8C
Fixed memory IJ operates based on clock pulses from
It executes instructions in the ROM and performs control while accessing predetermined data to the variable memory RAM.
Control timing is determined according to the timing of the timer TM by counting clock pulses, while control is based on command data from the host device stored in the variable memory RAM, self-management data, detection data from the sensor S, etc. It performs calculations and control decisions, and sends control signals to pumps P1 to Pn and actuator AC.

In addition, the terminal equipment TE can display, input, and update necessary data, thereby making it possible to monitor and change the control status.

- Note that the variable memory RA111[ stores tables to be described later, and these are used for control decisions regarding Pong P and -PnK.

FIG. 1 is a flowchart of the control situation by the processor CPU, including the time intervals OND for start-up control, the time intervals OFD for stop control, and
In addition, the maximum number of simultaneous startup machines and the maximum simultaneous stoppage number are stored in the variable memory RAM, and these are used as necessary, as well as the 11% ranking table and the second table shown below. The status table is also stored in the variable memory RAM and is used in the same way.

Table 1 Table 2 In FIG. 1, in accordance with control command data for each pump P, ~pa, equipment numbers are stored in the ranking table according to the east starting order as shown in Table 1 (1101), and then a pointer that addresses the
For the counter that counts the number of simultaneous startups, set -IN and %□I respectively by 1 pointer, l = 1/counter, C = O'102, and -OND from the previous startup.
Progress? ' If 111 becomes Y due to the time up of the timer TM, is the command to the % flea by the command data ON?
'l12 determines the command for the pump at address 1, and depending on Y, the town is currently OFF? ``113 is checked according to the operating status in Table 2, and if it is Y, a new start is performed, and the start command of 'i is stored in the memory'' 121 saves this data to the variable memory IJRAM.
%C=MAX+
? "Judging from 1234C, if this is N (No), after adding 'i=1+1' 124 to the grain pointer, step 11
Repeat steps 2 onwards.

Therefore, according to the command data, an ONt or OFF command is randomly given to each of the pumps P and ~P+s, but the pump that is commanded to be ON is the maximum number of simultaneously activated pumps MA.
Only the numbers below X are selected according to the order of Table 1, and in step 121, the data thereof is stored in a predetermined area of the variable memory RAM.

Next, in the same way as in step 101, the device number is stored in the ranking table according to the 1st stop layer '131, and then 'pointer 1=1/counter C=-C'13
In addition to setting the pointer by 2, in order to offset the disturbance of the controlled system due to simultaneous start and stop, the previous count value is set as a negative value in the counter, and used in the command data in case of an emergency. Is there a command to stop 1st group? '14
After determining 1, and depending on the YK of this, is there a change specification for the maximum number of simultaneous stops 'MAX' in the command data? '1
42, if this is also Y, 1 specified number → MAX
, ' MAX is updated by 143, and the elapsed time from the previous command is ignored? '144 is judged.

However, if either step 141 or 144 is yN, similarly to steps 111 to 113, has the OFD elapsed since the previous stop? 1 according to command data according to Y of '151
Is the quantity command OFF'? In addition to determining '152, is the town currently ON based on Table 2? 〃153 is judged, and if both are Y, a new stop is performed, and step 1
As in 21, after storing the town stop command in the memory 1161, the counter is registered by 'C=C+l' 162, and %C=MAXt? ' After determining l 63, move to the pointer according to N 'l=1+1'164
Perform addition by %l=n? Step 152 and subsequent steps are repeated through N of '165.

Therefore, only the number of pumps ordered to be turned off by the command data that is less than or equal to the maximum number of simultaneously stopped pumps is selected according to the ranking in Table 1, and in step 161, this
f) F'-Y is stored in a predetermined area of the variable memory RAM.

When each of the above steps is completed, 1 output processing 171 is performed to interface I
The start and stop signals are simultaneously sent via /F4, and the contents of Table 2 are updated in accordance with these situations.

Therefore, by determining the maximum number of simultaneous startups and the maximum number of simultaneous stops according to the load fluctuation tolerance capacity of the power receiving equipment and the fluctuation tolerance range of the controlled system, simultaneous startup and shutdown are represented by the number of pumps P, P, ~P
Responsiveness to the empty furnace condition via a is improved, and inrush current and voltage fluctuations as well as disturbances in the controlled system are suppressed to below permissible values.

The maximum number of units that can be started simultaneously and the maximum number of units that can be stopped simultaneously are determined by taking into consideration the control situation change tolerance characteristics of the air conditioner, and the time interval between start and stop control is determined based on the similar control situation change response characteristics and control seven points. - It may be determined in consideration of prevention of pinching and backflow of water supply Wy due to sudden decrease in water supply pressure.

Further, as a specific method for step 101.131, the method disclosed in Japanese Patent Application No. 57-34640 filed separately by the present applicant may be used.

In addition to water supply pumps, refrigerators, heat pumps, heaters, fans, etc. may also be used as target equipment.
Accordingly, as an energy source, in addition to an electric power source, a steam source such as a boiler, or a pressurized air source such as a compressor may be used. may be omitted or replaced with an equivalent one, and in the configurations of FIGS. 2 and 3, the sensor S1 actuator AC may be omitted depending on the conditions, or the timer TM may be configured by software. Various modifications can be made.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a plurality of controlled devices can be controlled to start and/or stop at the same time within the load variation tolerance of the energy source and the variation tolerance of the controlled system. This improves the responsiveness of the control situation via the controlled equipment, does not exceed the load fluctuation tolerance capacity of the energy source, and maintains sufficient stability of the control situation. A remarkable effect can be obtained in controlling the equipment.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a flowchart of the control situation, Fig. 2 is an instrumentation diagram, and Fig. 3 is a pronk diagram of the control device. P, ~Pn...Pump (control target equipment), CNT
・@e・Control device, CPU... Pro sensor, ROM
-・・e fixed memory, RAM ・・φ・variable memory,
TM...Timer. Patent applicant: Yamatake Honeywell Co., Ltd. Agent: Masaki Yamakawa (and 2 others) Figure 2 trZ ---ce Procedural amendment (voluntary) Mr. Commissioner of the Japan Patent Office, April 41, 1939
Display of the case 1982 Patent Application No. 262826 2, Invention name control method 3, Person making the amendment Relationship with the case Patent Applicant name (name)
666) Yamatake Honeywell Co., Ltd. 5, Subject of amendment tll Detailed explanation of the invention in the specification column (2) Drawing 6 Contents of amendment (11 Specification page 8 line 10 r@l=n?”J “″l＝
n+1?2" and correct it. (2) Same book, page 10, line 3, r" I=n? 'J r-l
= turtle +1! "" I corrected it. [3] Revise Figure 1 as shown in the attached sheet. that's all

Claims (1)

[Claims] In a control device that controls the start and stop of multiple devices to be controlled, the maximum load change capacity of the energy source involved in the operation of the target devices and the allowable range of variation of the controlled system are In addition to determining the number of devices to be started simultaneously and the maximum number of devices to be stopped simultaneously, the time intervals for start control and stop control are determined for each device, and after the elapse of each time interval, the target devices are A control method characterized by performing control.