JP2000357012A - Cooperative control system for central control unit and plural terminal control units - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the whole system from being not controlled smoothly while suppressing an adverse influence upon another normal system terminal by easily detecting all the kinds of abnormality in system terminals without providing a dedicated sensor. SOLUTION: A control unit 7 is joined with a function for obtaining the correlation value of a set room temperature SP and a measured room temperature PV transmitted for each of VAV control units 10-1 to 10-n, invalidating a request ability from the relevant control unit 10 when this correlation value is smaller than a prescribed threshold value and controlling the air conditioning ability of an air conditioner 1 on the basis of request abilities from the other VAV control units 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a central control unit and a plurality of terminals in a VAV (variable air volume control), VAT (variable air temperature control), VWV (variable flow rate control), VWT (variable water temperature control) system and the like. The present invention relates to a cooperative control system with a control device.

[0002]

2. Description of the Related Art Conventionally, for example, in a VAV system,
A variable air supply amount adjustment unit (VAV unit) is provided for each air supply outlet of each air conditioning target area (controlled object).
The amount of air blown from the AV unit is controlled by the VAV control unit according to the load condition (control condition) of the area to be air-conditioned. That is, by adjusting the damper opening of the VAV unit (terminal device) by the VAV control unit (terminal control device), the amount of air blown from the air conditioner (central device) to the area to be air-conditioned via the air supply duct is controlled. Like that. In this VAV system, the required capacity from each VAV control unit is given to a control device (central control device), and the control device sends out the performance of the air conditioner (such as air temperature Blowing volume)
Control.

[0003] In this case, if each VAV control at the system end is normally performed, the control of the entire system can be performed properly. However, some of the system ends deviate from the normal VAV control and a failure occurs in the VAV unit. If this occurs, not only that end but also other ends, that is, the control of the entire system will not be performed normally. Therefore, such VAV
In a system, it is desired to detect an abnormal end of the system, and if an abnormal end is detected, it is desired to take measures to prevent the abnormal end from affecting the entire system.

As a method of detecting an abnormality at the end of the system, in a VAV system disclosed in Japanese Patent Application Laid-Open No. 3-149396, each of the VAV units at the end of the system has an upper opening (full opening) and a lower opening (lower opening) of the damper opening. A sensor for detecting an opening lower than the full opening by a predetermined amount) is attached, and based on the detection output of this sensor, an abnormality in the damper opening of each VAV unit is detected, and the output of the opening information from the VAV unit in which the abnormality is detected is output. Is banned.

[0005]

However, in such a system, it is necessary to provide a dedicated sensor for detecting the abnormality at a place where the abnormality is assumed to occur, which greatly increases the cost of system construction. . In addition, it is possible to detect only an abnormality assumed in advance, and erroneously determines that the abnormality is normal even when an undetectable abnormality occurs,
The control of the whole system does not work well.

The present invention has been made in order to solve such a problem, and an object of the present invention is to easily detect any kind of abnormality at the end of the system without providing a dedicated sensor. It is an object of the present invention to provide a cooperative control system of a central control device and a plurality of terminal control devices that can prevent adverse effects on other normal system terminals and prevent the control of the entire system from becoming unsuccessful.

[0007]

In order to achieve the above object, the present invention provides a central control unit which obtains a correlation value between a target value and a control amount for each terminal control unit, and determines the correlation value to be a predetermined value. When the threshold value is smaller than the threshold value, the function requested from the corresponding terminal control device is invalidated, and the capability of the central device is controlled based on the request capability from the other terminal control devices. " According to the present invention, the correlation value between the target value and the control amount is obtained for each terminal control device, and when the correlation value is smaller than a predetermined threshold, the required capability from the corresponding terminal control device is invalidated, The performance of the central device is controlled based on the required capabilities from other terminal control devices. For example, in a VAV system, a correlation value between a set room temperature and a measured room temperature is obtained for each VAV control unit, and if the correlation value is smaller than a predetermined threshold, the required capability from the corresponding VAV control unit is invalidated, The performance of the air conditioner is controlled based on the required performance from other VAV control units.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 is an instrumentation diagram showing a VAV system employing a cooperative control system according to the present invention. In FIG. 1, reference numeral 1 denotes an air conditioner (central unit), which includes a cooling coil 3 to which cold water CW is supplied via an electric valve 2, a heating coil 5 to which hot water HW is supplied via an electric valve 4, and a blower 6. It is configured.

The operation of the inverter 6b, the motor-operated valve 2 and the motor-operated valve 4 in the air conditioner 1 is controlled by a control device (central control device) 7, and the air supplied from the fan 6a in the air conditioner 1 is supplied as air. The air is supplied to the air conditioning target areas (controlled objects) 9-1 to 9-n via the duct 8. The air conditioning target areas 9-1 to 9-n are provided with temperature sensors T1 to Tn for detecting room temperature for each area,
VAV control unit (terminal control device) in which room temperature PV measured by temperature sensors T1 to Tn is locally provided
10-1 to 10-n.

VAV control units 10-1 to 10-1
0-n is the measured room temperature PV and the set room temperature S given to each individual.
The required air volume to the air-conditioned areas 9-1 to 9-n is calculated based on the deviation from P and the blast temperature given by the control device 7, and the calculated air volume is returned to the control device 7, while the required air volume is secured. VAV unit (terminal device) 1
The degree of opening of the dampers 12-1 to 12-n of 1-1 to 11-n is controlled while observing the detection force (actual air volume) of the wind speed sensors 13-1 to 13-n.

The VAV control unit 10-
1 to 10-n determines the allowable range of the blast temperature to the air-conditioning target areas 9-1 to 9-n capable of processing the air-conditioning load Q at the current time as the allowable blast temperature range, and controls the obtained allowable blast temperature range. It also has a function of sending to the device 7. The method of obtaining the permissible air temperature range in this case is disclosed in Japanese Patent Application No. 8-31710 (Japanese Patent Application Laid-Open No. 9-22943) filed by the present applicant, and a detailed description thereof will be omitted. .

The control device 7 sets the allowable air temperature range sent from the VAV control units 10-1 to 10-n to a weighting coefficient Wn (0 <Wn <1: @ Wn = The air conditioner 1 is converted into the vote rate range indicated by 1), and the temperature of the air blown from the air conditioner 1 is determined based on the vote rate range. Further, the sum of required airflows sent from the VAV control units 10-1 to 10-n is obtained, and the airflow from the air conditioner 1 is determined based on the sum of the required airflows.

The control device 7 has a function unique to the present embodiment, such as “VAV control unit 10 (1
Set room temperature SP transmitted for each of 0-1 to 10-n)
A correlation value between the (target value) and the measured room temperature PV (control amount) is obtained, and when the correlation value is smaller than a predetermined threshold, the required capacity (permissible air temperature range or required air volume) from the corresponding VAV control unit 10 is obtained. ) Is invalidated and other V
The function of “controlling the performance of the air conditioner 1 (blowing temperature and blowing volume) based on the required performance from the AV control unit 10” is added.

With the function added to the control device 7,
All types of abnormalities at the end of the system can be easily detected without providing a dedicated sensor, preventing adverse effects on other normal ends of the system and preventing malfunction of the entire system. it can.

That is, various abnormalities (hardware failure, system configuration failure, control software failure, etc.) may occur at the end of the system. It occurs in a different way than in some cases. In this case, at the end of the system, the correlation between the measured room temperature PV and the set room temperature SP is broken.

FIG. 2A illustrates a correlation between the set room temperature SP and the measured room temperature PV in a normal case. FIG. 2B illustrates a correlation between the set room temperature SP and the measured room temperature PV in the case of an abnormality. As described above, when any abnormality occurs at the end of the system, the correlation between the set room temperature SP and the measured room temperature PV is broken.

In this embodiment, the state in which the correlation is broken is detected as a case where the correlation value between the set room temperature SP and the measured room temperature PV is smaller than a predetermined threshold, and an abnormality occurs in the VAV control at the terminal. Judge that it is. Also. If it is determined to be abnormal, the corresponding VAV control unit 1
The allowable air temperature range and the required air volume from 0 are invalidated, and the air temperature and air volume of the air conditioner 1 are determined based on the allowable air temperature range and the required air volume from the other VAV control units 10.

In the above description, a VAV system has been described as an example, but VAV (variable air volume control), VA
T (variable air temperature control), VWV (variable flow rate control), V
In the same way, in a WT (variable water temperature control) system, etc., it is also possible to detect abnormalities at the terminal end of the system from the correlation value between the target value and the control amount. Can be detected. Further, by invalidating the capability requested from the terminal control device determined to be abnormal, it is possible to prevent adverse effects on other normal system terminals, thereby preventing the control of the entire system from becoming unsuccessful.

FIG. 3 is an instrumentation diagram showing a VWV system employing the cooperative control system according to the present invention. In the figure, 31-1 to 31-n are air conditioners (controlled objects), 32
-1 to 32-n are control valves (terminal devices) attached to the air conditioners 31-1 to 31-n, and F1 to Fn are control valves 32-1 to 32-1.
VW, a flow meter for detecting the flow rate of cold / hot water flowing through 32-n
V1 to VWVn control valves 32-1 to 32-32 so that the flow rates of the cold and hot water detected by the flow meters F1 to Fn match the set flow rates provided by the air conditioner controllers 33-1 to 33-n.
-N is a valve opening control unit for controlling the opening.

33-1 to 33-n are air conditioner controllers constituting a terminal control device in combination with the valve opening control units VWV1 to VWVn, and 34-1 to 34-n are air conditioners 31-1 to 31-n. Temperature sensor for detecting the supply air temperature from the air, 35 is a flow meter, 36 is a heat source controller (central control unit), 37 is a pressure controller, 38 is a pressure transmitter for detecting the water supply pressure at the end of the piping system, 39-1, 39-2
Are secondary pumps (booster pumps), 40-1, 40-2
Is an inverter, 41 is a bypass valve, 42-1 and 42-2.
Is a primary pump, 43-1 and 43-2 are cold and hot water generators (central unit), 44-1 is an outgoing water line, 44-2 is a return water line,
45-1 to 45-3 are headers.

In this VWV system, the air conditioner 31
-1 to 31-n are provided on the first floor to the nth floor of the building, receive cold and hot water supplied through the outgoing water pipeline 44-1 to generate cold and hot air, and supply the cold and hot air to each floor through ducts. Supply to each room. A VAV unit is provided in the air supply passage of each room on each floor, and the room temperature of each room is adjusted to the set temperature by adjusting the air volume (damper opening) in the VAV unit. The adjustment status of the air volume in each VAV unit on each floor is sent from each VAV control unit to the air conditioner controllers 33-1 to 33-n.

Air conditioner controllers 33-1 to 33-n
Is an air conditioner 3 based on the adjustment of the air volume in each VAV unit sent from each VAV control unit.
The air supply temperature from 1-1 to 31-n is set, and the set air supply temperature SP (target value) and the actual air supply temperature PV (control amount) are set.
The set flow rate Qsp is obtained in accordance with the deviation from the above, and the set flow rate Qsp is supplied to the valve opening control units VWV1 to VWVn. The valve opening control units VWV1 to VWVn control the control valve 32- so that the flow rate Qpv of the cold / hot water detected by the flow meters F1 to Fn matches the set flow rate Qsp provided from the air conditioner controllers 33-1 to 33-n. The opening degree of 1-32-n is controlled.

Further, the air conditioner controllers 33-1 to 33 are provided.
-N determines the control state (air conditioner control status) of the air conditioners 31-1 to 31-n based on the flow control state by the valve opening control units VWV1 to VWVn, and sets the air conditioner control status to the heat source controller 36. Send to

The heat source controller 36 determines the overall water supply state (total water supply status) based on the air conditioner control status sent from the air conditioner controllers 33-1 to 33-n. Then, based on the determined total water supply status, the set value change width for the current set water supply pressure at the end of the piping system is determined, and the set water supply pressure Psp is calculated from the determined set value change width, and the pressure controller 3
Send to 7.

In this case, the air conditioner control status,
The method of determining the total water supply status and the change range of the set value is disclosed in Japanese Patent Application No. 6-215795 (Japanese Unexamined Patent Application Publication No. 8-75223) filed by the present applicant, and a detailed description thereof will be omitted.

The pressure controller 37 receives the set water supply pressure Psp from the heat source controller 36, calculates the difference between the set water supply pressure Psp and the actual water supply pressure Ppv, and outputs a control signal corresponding to the difference to the inverter 40-1, Then, the pumps 39-1 and 39-2 are controlled so that the set water supply pressure Psp and the actual water supply pressure Ppv match.

The heat source controller 36 has a function unique to the present embodiment, namely, the "air conditioner controller 33 (33-
Set air supply temperature SP transmitted for each of 1-33 to n)
A correlation value between the (target value) and the measured supply air temperature PV (control amount) is obtained. When the correlation value is smaller than a predetermined threshold, the required capacity (air conditioner control status) from the corresponding air conditioner controller 33 is determined. Invalid, and the cold / hot water generator 43 (4
3-1 and 43-2) to control the performance (water supply pressure).

The function added to the heat source controller 36 makes it possible to easily detect any kind of abnormality at the end of the system without providing a dedicated sensor, similarly to the above-described VAV system. It is possible to minimize adverse effects on the system end and prevent the control of the entire system from becoming unsuccessful.

[0029]

As is apparent from the above description, according to the present invention, a correlation value between a target value and a control amount is obtained for each terminal control device, and when the correlation value is smaller than a predetermined threshold value, The required capability from the corresponding terminal controller is invalidated, and the performance of the central unit is controlled based on the required capability from the other terminal controllers. The detection can be easily performed without the provision, and adverse effects on other normal system terminals can be suppressed, thereby preventing the control of the entire system from becoming unsuccessful.

[Brief description of the drawings]

FIG. 1 shows a V adopting a cooperative control system according to the present invention.
1 is an instrumentation diagram showing an AV system.

FIG. 2 shows a correlation between a set room temperature SP in a normal case and a measured room temperature PV, and a set room temperature SP and a measured room temperature PV in an abnormal case.
It is a figure which illustrates the correlation with.

FIG. 3 shows a V adopting the cooperative control system according to the present invention.
It is an instrumentation diagram showing a WV system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioner (central device), 2, 4 ... Electric valve, 3 ... Cooling coil, 5 ... Heating coil, 6 ... Blower, 7 ... Control device (Central control device), 9 (9-1 to 9-n) ... Air-conditioning target area (controlled target), 10 (10-1 to 10-n) ... VAV
Control unit (terminal control device), 11 (11-
1 to 11-n) VAV unit (terminal device), 12
(12-1 to 12-n) ... damper, 13 (13-1 to 1-1)
3-n) Wind speed sensor, 14 (14-1 to 14-n)
Opening sensors, T1 to Tn ... temperature sensors, 31-1 to 31
-N: air conditioner, 32-1 to 32-n: control valve, F1 to F
n: flow meter, VWV1 to VWVn: valve opening control unit, 33-1 to 33-n: air conditioner controller, 34-
1-34-n: temperature sensor, 36: heat source controller,
37: pressure controller, 38: pressure transmitter, 39-
1, 39-2: secondary pump; 40-1, 40-2: inverter; 43-1, 43-2: cold / hot water generator.

Claims (1)

[Claims] 1. A first to N-th unit provided for each controlled object.
(N> 1) terminal devices; first to N-th terminal control devices that individually control the first to N-th terminal devices according to a control situation of a controlled object; A central device that supplies energy to the controlled object via the terminal device, and a central control device that controls the performance of the central device based on the required capabilities sent from the first to Nth terminal control devices. The central control unit obtains a correlation value between a target value and a control amount for each of the terminal control devices, and when the correlation value is smaller than a predetermined threshold, a required capacity from the corresponding terminal control device is determined. A cooperative control system of a central control device and a plurality of terminal control devices, wherein the central control device and the plurality of terminal control devices are disabled, and the performance of the central device is controlled based on required capabilities from other terminal control devices.