JPH0123699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal controller used in an air conditioning control device for a building or the like.

Such conventional air conditioning control equipment consists of a central control unit using a computer, etc., and local converters distributed throughout the premises, and the central control unit performs judgment processing based on data from each local converter. The results are sent to local converters to control each part of the air conditioning equipment, and control decisions are made all at once in the central control unit, so if the central control unit fails, all air conditioning equipment is This had the disadvantage that control was impossible.

In addition, because the central control unit and each local converter are connected by individual wiring or by multiple busbars, the amount of wiring is extremely large, and the cost of required wire materials and wiring man-hours is high. becomes more expensive,
It is not easy to change the configuration by adding a local converter, and it also has drawbacks such as the inability to freely combine various combinations due to the device configuration.

Furthermore, if you have a contract for heat from a local heat source, you will be subject to a penalty for using more than a certain amount of heat. To prevent this, it is necessary to control the amount of heat supplied to below a certain amount of heat, but in the past, such control to reduce the amount of heat supplied could only be done manually, much less managed.

In addition, in the past, all decisions were made in the central control unit, which required a lot of information processing and required a lot of operating time, and had the disadvantage that various controls could not be carried out smoothly and quickly. .

The present invention has the purpose of fundamentally solving such drawbacks of the conventional technology, and provides judgment and control functions to terminal controllers that transmit and receive data with the main controller and locally control each type of air conditioner. The present invention provides a highly effective terminal controller with a heat demand control function that does not cause a general uncontrollable state and performs control smoothly and promptly by distributing the heat amount demand.

FIG. 9 is a complaint correspondence diagram, and FIG. 10 is a configuration diagram of another terminal controller. In FIG. 9, 1 is a fixed memory that stores instructions, 2 is a variable memory that accesses data, 3 is a clock means, and 4 is a clock means 3.
5 is a communication interface, and 6 is a control level that stores a control level received via the communication interface 5. storage means; 7; demand level setting means for determining its own demand level; 8;
is a supply heat amount control unit that compares the control level and the demand level and performs control to reduce the heat supply to the air conditioner when the demand level is lower than the control level. Further, in FIG. 10, numeral 9 is a heat quantity detector, 10 is a control level calculation means based on the heat quantity of the heat quantity detector 9, and 11 is a communication interface for transmitting a control level signal which is the calculation result of the control level calculation means 10. It is.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

Figure 1 is a block diagram of the entire configuration, and the main controller
Air conditioning equipment TE such as a keyboard and cathode ray tube display device are connected to the MCT, and by transmitting and receiving data with these devices, data can be freely input by the operator and data can be output to the operator.
The main controller MCT is connected to the sub-controllers SCT ₁ to SCTm by a common transmission path La, and transmits predetermined data to each sub-controller SCT ₁ to SCTm.
It is designed to receive data from SCTm.

Further, the sub-controllers SCT ₁ to SCTm each control a plurality of terminal controllers through respective transmission paths Lb ₁ to Lbm.
TCT ₁₁ ~TCT ₁ n, TCT ₂₁ ~TCT ₂ n, TCTm ₁ ~
It is connected to TCTmn and relays data transmission and reception between these and the main controller MCT as necessary, and each terminal controller TCT ₁₁ to _{TCT no-1}
The temperature sensor T, humidity sensor H, status contact of the fan motor FM, etc. are connected as local sensors, and the motor control valve MV and electromagnetic switch MS, etc. for controlling various air conditioners are connected to the and each terminal controller TCT ₁₁ ~
TCTmn sends and receives data to and from the sub-controllers _SCT1 to SCTm, and makes control decisions based on the detection outputs of each sensor T and H and the status of the fan motor FM's status contacts, and controls motor valves MV, electromagnetic switches MS, etc. By sending control outputs to the air conditioners, each type of air conditioner can be locally controlled.

However, the terminal control TCTmn is installed near a heat source such as a boiler or a refrigerator, and the temperature and flow rate of the heat medium such as hot water, steam, and cold water supplied from these to each control device is monitored by the temperature sensor T and the flow rate sensor. It is designed to be detected by F.

Figure 2 is a block diagram of the main controller MCT.
Mainly processor CPUm, fixed memory ROMm, variable memory for microprocessors etc.
RAMm, transmission circuit TRXm, and interface IFm are arranged, and these are connected by bus BUSm, and fixed memory ROMm is installed in advance.
Processor CPUm executes the instructions stored in
Sub-controller SCT ₁ ~ SCTm via transmission circuit TRXm
The data transmitted and received with the terminal device TE and the data transmitted and received with the terminal equipment TE via the interface IFm are accessed as necessary to the variable memory RAMm.

Figure 3 is a block diagram of the sub-controllers _SCT1 to SCTm, which, like the main controller MCT, are
CPUs are the center, and fixed memory ROMs, variable memory RAMs, and transmission circuits TRXs ₁ and TRXs ₂ are arranged around them, and these are connected by bus BUSs.Based on the instructions stored in the fixed memory ROMs, the transmission circuit Main controller via TRX ₁ and TRX ₂
Variable memory for data required for data transmission and reception between the MCT and each terminal controller TCT ₁₁ to TCTmn
It is designed to relay while accessing RAMs.

FIG. 4 is a block diagram of the terminal controllers TCT ₁₁ to TCTmn, which, like the main controller MCT, are centered around a processor CPUt as a control unit, a fixed memory ROMt, a variable memory RAMt, and a transmission circuit.
TRXt and interfaces IFt ₁ and IFt ₂ are arranged around the periphery and connected by a bus BUSt, but a write memory PROM using programmable read-only memory is provided. It is connected to the bus line BUSt via a writer (write circuit) WRT for writing data to the BUSt, and data is accessed to the write memory PROM via this. Once written data is exposed to ultraviolet rays or The data is retained forever until it is erased by electrical means or the like.

In addition, the variable memory RAMt has a large capacitor C _Ps connected to the +V side of the power supply, so even if the main power supply fails, the variable memory will remain available for about 48 hours.
The data stored in RAMt will not be deleted. However, the same effect can be obtained even if a battery is used instead of the capacitor C _P s.

Note that the processor CPUt is a fixed memory ROMt.
Executes instructions stored in the controller, transmits and receives data to and from sub-controllers SCT ₁ to SCTm via the transmission circuit TRXt, and inputs digital data from each sensor and status contact via the interface IFt ₁ .
DI, analog data input AI reception, and digital data output DO for each control part,
The analog data output AO is sent and the necessary data is accessed to the variable memory RAMt, but important data is fixedly stored in the write memory PROM via the writer WRT, and the detection of each sensor The processor CPUt makes control decisions based on each data DI, AI, and sending/receiving data indicating the status of output and status contacts.
Each data output DO, AO is sent out as a control output.

In addition, a small and portable setting device PST with a keyboard and character display is connected to the connector CN via the interface IFT ₂ , and its operation allows the processor CPUt
responds to variable memory RAMt and write memory
The contents of the PROM can be displayed and data can be updated or newly stored in the PROM at will.

However, the terminal controller TCTmn determines the amount of heat of the heat medium based on the data from the temperature sensor T and flow rate sensor F, compares it with multiple predetermined target values, and calculates the amount of heat of the heat medium in each air conditioner. The control level that determines the amount of reduction in the opening of the supply valve is determined for each hot water, steam, and cold water, and these are sent as data to the main controller MCT.

Figure 5 shows the processor of the terminal controller TCTmn.
This is a flowchart showing the control operation by CPUt. After "START" by turning on the power or recovering from a power outage, "initialization" is performed to set the initial state, and test data is accessed to the variable memory RAMt. Judging whether access to this is normal or not, judging whether the set value data is stored in the variable memory RAMt, and checking whether the total number of bits of the data stored in the variable memory RAMt is the same as before the power outage. "Self-diagnosis" is performed by determining whether the data is the same or not, and if YES in "Is there an abnormality?", the write memory
After performing "abnormality countermeasure processing" such as transferring the contents of the PROM and newly storing it in the variable memory RAMt, "data transmission/reception" is performed to send and receive data from the sub-controllers SCT ₁ to
The main controller MCT is notified of the occurrence of an abnormality via the SCTm, and the required data is received from the main controller MCT and stored in the variable memory RAMt.

If “Is there an abnormality?” is NO, the temperature sensor T
According to the data from the flow rate sensor F and flow rate sensor
After storing the actual “measured value and target value”
Then, "control level determination" is performed to determine the reduction opening degree of the heat source supply valve in each air conditioner, depending on which of the measured values is larger than the target value.

Next, the presence or absence of the setting device PBT is determined by "PST check", and if "PST present?" is NO, the process immediately shifts to "data transmission/reception".
If this is YES, it performs "PST processing" such as sending data to the setting device PST and storing data from the setting device PST, and also performs "data transmission/reception" to obtain the necessary current data. At the same time, the received data is stored in the variable memory RAMt, and the above operations are repeated.

FIG. 6 is a flowchart showing the control operation by the processor CPUt of the terminal controllers TCT ₁₁ to _{TCT no-1} . "time schedule control," which allows power to be turned on to air conditioners only during predetermined time periods, and "time schedule control," which allows power to be turned on to air conditioners only during predetermined times; After performing "upper and lower limit monitoring," which compares the upper and lower limit values and sends out data indicating an alarm when the actual measured value is above the upper limit or below the lower limit, By calculation, hot water valves, steam valves,
Performs "adjustment control" to set the opening degree of each heat source supply valve such as the cold water valve.

In addition, following this, "level control", which will be described later, is performed, thereby determining the final opening degree of the heat source supply valve, and depending on this result, control data is sent to digital data output "DO sending" and analog data output. After data is sent using the data output "AO send", as in Fig. 5, "PST check", "PST present?" determination, "PST processing", etc. are performed, and then "data transmission/reception" is performed. Repeat these actions.

FIG. 7 is a flowchart showing details of "level control" in FIG. 6, and shows the main controller MCT.
The control level given from the terminal controller TCTmn is stored in variable memory by “control level capture”.
Read from RAMt and compare the chilled water control level with the chilled water demand level corresponding to its own importance using “chilled water/control level > demand level”. If this is YES, the chilled water valve is set according to the control level. The amount of opening reduction is subtracted from the opening set by the "adjustment control" to determine the opening for cold water reduction.

In addition, regarding hot water and steam,
“Hot water/control level > demand level”, “hot water reduction opening determination” and “steam/control level > demand level”, “steam reduction opening determination” are performed in the same way. Therefore, based on these results, each heat source The opening degree of the supply valve is determined and the amount of heat supplied from the heat source is reduced accordingly, preventing overloading of the heat source and excess consumption of energy.

In addition, the valve opening degree is set by a ratio that takes the maximum opening as 100% in "adjustment control", and the reduction amount is also set by the same ratio. If the valve opening is 80% and the reduction amount is 20%, the final reduction opening will be 60%.

FIG. 8 is a diagram showing the determination status of the control level in the above control. If the amount of heat C supplied from the heat source changes according to the transition of time t as shown in A of the figure, the amount of heat C On the other hand, the first target value M ₁ ,
The second target value M ₂ and these day gradations
Md ₁ and Md ₂ are determined, and when the amount of heat C reaches the first target value M ₁ , the control level L is set as shown in Figure B.
becomes “1”, and furthermore, the amount of heat C becomes the second target value M ₂
When the control level L reaches "2", the control level L becomes "2".

However, when the amount of heat C decreases, in order to prevent hunting from occurring in the control situation, the control level L changes from "2" to "1" when the day gradient Md decreases to ₂ . Further, the control level L changes from " ₁ " to "0" when the decrement Md1 is lowered.

Therefore, if the amount of heat supplied from heat sources such as boilers and refrigerators increases, the amount of heat consumed by each air conditioner will be reduced in accordance with the increase, preventing overload of the heat source and saving energy. Ru. As described above, according to the present invention, the amount of heat to be supplied can be controlled to be reduced in accordance with the control level of the amount of heat, so there is no need to incur a fine for using more than a certain amount of heat. In addition to preventing fines, it can also be used to manage the amount of heat used. For example, the amount of heat supplied is controlled to be reduced (compared to its own demand level) in accordance with the control level signal corresponding to the output (amount of heat supplied) of the heat source device (boiler, refrigerator, etc.), so the amount of heat is managed. becomes possible. In heat management, if the target of air conditioning is an important room, etc., the relationship with the control level can be adjusted by increasing the demand level so that the amount of heat supplied is not reduced. In a certain room, the demand level can be set to the lowest and the amount of heat can be reduced first.
In this way, various controls can be made by adjusting the relationship between the demand level and the control level.

Note that each terminal controller TCT ₁₁ to _{TCT no-1} stores basic control data in the variable memory RAMt and write memory PROM, so the main controller
MCT, sub-controller SCT ₁ to SCTm and each transmission line
Even if a failure occurs in any or all of La, Lb ₁ to Lbm, each terminal controller TCT ₁₁ to
TCT _no-1's unique operation allows local control of each air conditioner to be performed without any problems.

In addition, the main controller MCT and the sub controllers SCT ₁ ~ SCTm
are connected by a common transmission path La, and the sub controllers SCT ₁ to SCTm and each terminal controller SCT ₁₁ to
Since they are connected to SCTmn by individual transmission lines Lb ₁ to Lbm, if the sub-controllers SCT ₁ to SCTm are installed in the vicinity of each group of terminal controllers TCT ₁₁ to TCTmn, The amount of wiring and wiring man-hours can be reduced, and terminal controllers can be installed as needed.
Since it is only necessary to provide the TCT and the sub-controller SCT, it is extremely easy to change the overall configuration.

In addition, control decision functions are provided to each terminal controller.
Since it is distributed over _TCT11 to TCTmn, the decision processing speed is improved and control can be performed smoothly and quickly.

However, the order of each flowchart may be changed as appropriate depending on the conditions, or unnecessary steps may be omitted.Depending on the scale of the device configuration, it is also possible to omit the sub-controllers _SCT1 to SCTm. The same applies even if the functions of the terminal controller TCTmn are added to the main controller MCT depending on the situation.

Furthermore, the present invention can be modified in various ways without using a processor as the control section, and by using a dedicated control circuit made up of a combination of various logic circuits.

As is clear from the above description, according to the present invention, overload prevention of heat sources and energy saving are achieved, and distributed control functions are centrally managed, so general data changes and control are achieved. This makes it easier to monitor the situation, limits the impact of failures to local areas, and reduces the amount of wiring and wiring man-hours.
Changes can be made easily, and the control situation can be made smooth and quick, so that remarkable effects can be obtained in air conditioning control devices for various uses.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire configuration, Fig. 2 is a block diagram of the main controller, Fig. 3 is a block diagram of the sub-controller, and Fig. 4 is a block diagram of the terminal controller. The block diagram, Figures 5 and 6 are flowcharts showing control operations by the processor of the terminal controller, Figure 7 is a flowchart showing details of "level control", and Figure 8 is a flowchart showing the increase/decrease in heat amount and control level. Figure 9 is a complaint correspondence diagram, Figure 1 shows the relationship between
FIG. 0 is a configuration diagram of another terminal controller. MCT...Main controller, SCT ₁ to SCTm...Sub controller, TCT ₁₁ to TCTmn...Terminal controller, TE...
Terminal equipment, T...Temperature sensor, H...Humidity sensor, F...Flow rate sensor, MV...Motor control valve,
MS...Electromagnetic switch, CPUm, CPUs, CPUt...
...processor, ROMm, ROMs, ROMt...fixed memory, RAMm, RAMs, RAMt...variable memory, TRXm, TRXs ₁ , TRXt...transmission circuit,
IFm, IRt ₁ , IFt ₂ ...Interface, WRT
...Writer, PROM...Writing memory, BUSm,
BUSs, BUSt...Bus bar.

Claims (1)

[Claims] 1 An air conditioning control device consisting of a main controller that is connected to a terminal device and performs data transmission and reception with the terminal device, and a terminal controller that transmits and receives data with the main controller and performs local control for each type of air conditioning equipment. , a fixed memory storing instructions, a variable memory for accessing data, a timekeeping means, a control means for reading out instructions and data from each memory according to time measurement by the timekeeping means to perform time schedule control, and a communication interface. A control level storage means for storing the control level received via the ACE, and a demand level setting means for determining the own demand level, compares the control level with the demand level and compares the demand level with the demand level. a supply heat amount control unit that performs control to reduce the heat supply amount to the air conditioner when the temperature is low;
The control level is transmitted from another terminal controller that performs data transmission and reception with the main controller, and the other terminal controller includes a heat quantity detector, a control level calculation means based on the heat quantity of the heat quantity detector, 1. A terminal controller with a heat demand control function, comprising: a communication interface for transmitting a control level signal that is a calculation result of the control level calculation means.