JP6682177B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system.

  Conventionally, an air conditioning system is composed of an indoor unit and an outdoor unit. For example, Patent Document 1 discloses an air conditioning system in which one outdoor unit and a plurality of indoor units are connected by a common refrigerant pipe, and a control device corresponding to each of the outdoor unit and each indoor unit is provided. ing.

Japanese Patent Laid-Open No. 2012-98020

  However, in the above-described air conditioning system, since the control device (processor) is provided in each of the outdoor unit and the indoor unit, the cost of the indoor unit and the outdoor unit increases. Further, since the indoor unit and the outdoor unit control the air conditioning system while communicating, it is necessary that all control programs used for control have the same control version. Therefore, it was difficult to change some of the indoor units and outdoor units that compose the air conditioning system to devices with new control specifications.

  The present invention has been made in view of the above circumstances, and provides an air conditioning system that can reduce the price of an outdoor unit and an indoor unit and can easily upgrade the system version. The purpose is to

A first aspect of the present invention includes an outdoor unit including a communication unit and an outdoor protection control unit, an indoor unit including a communication unit, and a control device existing independently of the outdoor unit and the indoor unit. The control device is capable of communicating with the outdoor unit via a communication medium, and is also capable of communicating with the outdoor unit control unit existing independently of the outdoor unit via the communication medium with the indoor unit. And an indoor unit control unit that exists independently of the indoor unit, the outdoor unit control unit and the indoor unit control unit are capable of exchanging information, the outdoor unit control unit Acquires the information of the device mounted on the outdoor unit via the communication medium, and outputs a control command to the device mounted on the outdoor unit, and the indoor unit control unit controls the communication medium. Information on the equipment installed in the indoor unit via Together with outputting a control command to the device mounted in the indoor unit, the outdoor protection control means determines whether a preset emergency stop condition is satisfied, and when the emergency stop condition is satisfied, The compressor is stopped, the outdoor unit control unit and the indoor unit control unit are mounted on the control device as a virtualized control unit, the control device has a master control unit, and the master control unit is , At the time of start-up, acquiring attribute information of the indoor unit and the outdoor unit connected to the communication medium, and based on the attribute information, the virtualized indoor unit control unit and the virtualized outdoor It is an air conditioning system that generates a machine control unit .

According to the above air conditioning system, since the indoor unit control unit and the outdoor unit control unit are provided independently of the indoor unit and the outdoor unit, it is possible to simplify the configurations of the indoor unit and the outdoor unit, and reduce the cost. Can be achieved. Furthermore, it is not necessary to install a high-level program in the indoor unit and the outdoor unit (for example, only communication, actuating function of parts, outdoor protection control function are installed), there is no obsolescence of equipment, and the outdoor unit Also, the indoor unit can be easily replaced.
Furthermore, since the indoor unit control unit and the outdoor unit control unit are provided independently of the indoor unit and the outdoor unit, for example, place the indoor unit control unit and the outdoor unit control unit under the control of the manufacturer of the air conditioning system. Thus, it becomes possible to easily perform work such as updating related to the program.
Further, according to the air conditioning system, the outdoor unit is provided with the outdoor protection control means having the emergency stop function. Therefore, even if the communication between the outdoor unit and the outdoor unit control unit is interrupted, it is possible to immediately stop the compressor when an event that requires an emergency stop occurs. Become.

  In the above control system, the outdoor protection control means, for example, when the low pressure side pressure is equal to or lower than a preset first threshold value, or when the high pressure side pressure is equal to or higher than a preset second threshold value. Then, it is determined that the emergency stop condition is satisfied, and the compressor is stopped.

  In the control system, the outdoor protection control means may be configured such that when the low pressure side pressure is equal to or lower than a third threshold value that is set to a value larger than the first threshold value, or the high pressure side pressure is higher than the second threshold value. Is greater than or equal to the fourth threshold value that is set to a small value, protection control may be performed to reduce the rotation speed of the compressor.

  According to such a control system, since the protection control is performed before the emergency stop occurs, it is possible to prevent the emergency stop as much as possible.

  In the above control system, the indoor unit may further include an indoor protection control unit that fully closes the expansion valve when the temperature of the heat exchanger is equal to or lower than a preset fifth threshold value.

  According to such an air conditioning system, the indoor unit is provided with a function (anti-frost function) of fully closing the expansion valve when the temperature of the heat exchanger falls below the fifth threshold value. As a result, even if the communication between the indoor unit and the indoor unit control unit is interrupted, if an event requiring anti-frost occurs, the expansion valve will be fully closed immediately. It becomes possible.

  In the above air conditioning system, the outdoor unit control unit and the indoor unit control unit may be mounted in a control device as a virtualized control unit.

As described above, the presence of the virtualized control unit makes it possible to flexibly generate the control unit according to the connected device. Further, since the hardware resources of the control device may be determined according to the scale of the air conditioning system, it is possible to reduce the waste of CPU resources.
In the air conditioning system, the outdoor unit control unit outputs a control command to a driver that drives the device installed in the outdoor unit, and the indoor unit control unit includes the device installed in the indoor unit. The control command may be output to the driver that drives the.

  Advantageous Effects of Invention According to the present invention, it is possible to reduce the prices of an outdoor unit and an indoor unit, and it is possible to easily upgrade the system version.

It is a figure showing the refrigerant system of the air-conditioning system concerning one embodiment of the present invention. It is an electric lineblock diagram of an air-conditioning system concerning one embodiment of the present invention. It is a figure showing an example of a hierarchical structure of communication of an air-conditioning system concerning one embodiment of the present invention. 5 is a flowchart showing a processing procedure when the control device is activated.

An air conditioning system and a control method thereof according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a refrigerant system of an air conditioning system 1 according to this embodiment. As shown in FIG. 1, the air conditioning system 1 includes one outdoor unit B and a plurality of indoor units A1 and A2 connected to the outdoor unit B by a common refrigerant pipe. Although FIG. 1 illustrates a configuration in which two indoor units A1 and A2 are connected to one outdoor unit B for convenience, the number of installed outdoor units and the number of connected indoor units are not limited. .

  The outdoor unit B includes, for example, a compressor 11 that compresses and sends out a refrigerant, a four-way valve 12 that switches the circulation direction of the refrigerant, an outdoor heat exchanger 13 that exchanges heat between the refrigerant and the outside air, an outdoor fan 15, and a refrigerant. The accumulator 16 and the like provided in the suction side pipe of the compressor 11 are provided for the purpose of separating the machine liquid.

The indoor units A1 and A2 include indoor heat exchangers 31a and 31b, indoor fans 32a and 32b, and electronic expansion valves 33a and 33b, respectively. The two indoor units A1 and A2 are connected to the refrigerant pipes 21A and 21B branched by the header 22 and the distributor 23 in the outdoor unit B, respectively.
Further, the outdoor unit B and the indoor units A1 and A2 include a pressure sensor 21 that measures the refrigerant pressure (including a pressure sensor 21a that measures the high-pressure side pressure and a pressure sensor 21b that measures the low-pressure side pressure), a refrigerant temperature, and the like. Various sensors 20 (see FIG. 2) such as a temperature sensor 24 for measuring (including a temperature sensor 24a for measuring the temperature of the indoor heat exchanger 31a and a temperature sensor 24b for measuring the temperature of the indoor heat exchanger 31b) are provided. ing.

FIG. 2 is an electrical configuration diagram of the air conditioning system 1 according to the present embodiment. As shown in FIG. 2, the indoor units A1 and A2, the outdoor unit B, and the control device 3 are connected via a common bus 5 and are capable of exchanging information with each other. The common bus 5 is an example of a communication medium, and the communication may be wireless or wired.
The control device 3 is connected to the maintenance / inspection device 6 that performs maintenance / inspection via the communication medium 7, and is configured to periodically transmit operation data and to promptly notify when abnormality occurs. .

  Here, in the conventional air conditioning system, as shown in Patent Document 1, a control device is provided inside each of the indoor unit and the outdoor unit. On the other hand, in this embodiment, the indoor unit controllers 41 and 42 and the outdoor unit controller 43 are provided independently of the indoor units A1 and A2 and the outdoor unit B. Specifically, the indoor unit control unit 41 that controls the indoor unit A1, the indoor unit control unit 42 that controls the indoor unit A2, and the outdoor unit control unit 43 that controls the outdoor unit B are virtualized control units. Each is mounted in the control device 3.

  That is, the indoor unit control units 41 and 42 and the outdoor unit control unit 43 are integrated into the control device 3 having one piece of hardware, and the hardware included in the control device 3 can independently operate. . The control device 3 has a master control unit 40 for virtually allowing the indoor unit control units 41 and 42 and the outdoor unit control unit 43 to exist in the control device. The generation processing of the indoor unit control units 41 and 42 and the outdoor unit control unit 43 by the master control unit 40 will be described later.

  In the control device 3, the indoor unit control units 41 and 42 and the outdoor unit control unit 43 are configured to be able to exchange information with each other. Further, the indoor unit control units 41 and 42 and the outdoor unit control unit 43 may perform autonomous decentralized control for realizing independent autonomous decentralized control while sharing information, for example. Here, the autonomous decentralized control means the sensors 20 and other control units (for example, in the case of the indoor unit control unit 41, the indoor unit control unit 42 and the outdoor unit control unit 43 correspond to other control units). Information is received from the device and a predetermined application receives the information as input and gives a control command to a corresponding indoor unit or outdoor unit (for example, the indoor unit A1 in the case of the indoor unit control unit 41) according to a control rule. Say.

  The indoor unit A1 is provided with various devices (including some sensors) 51, an indoor fan 32a, an electronic expansion valve 33a, and the like (see FIG. 1) provided in the indoor unit A1, respectively. A driver 52, a gateway (communication means) 53, and an indoor protection control unit 54 are provided. Each of these devices is connected to the common bus 5 via an internal bus and also via a gateway 53.

  The indoor protection control unit 54 is realized by, for example, a processor loading an indoor protection program (for example, an anti-frost program) recorded in a computer-readable recording medium into a main storage device and executing the program. The indoor protection control unit 54 receives a measured value from the temperature sensor 24a that measures the temperature of the indoor heat exchanger 31a (see FIG. 1), for example, via an internal bus, and the measured value is a preset threshold value. When it is (fifth threshold value) or less, it is determined that freezing may occur, and anti-frost control is performed to fully close the electronic expansion valve 33a of the indoor unit A1.

  As will be described later, the indoor protection control unit 54 can acquire the temperature measurement value of the indoor heat exchanger 31a from the sensors 20 via the common bus 5 and the gateway 53, but in this case, the common bus is used. When a communication failure occurs in 5, the temperature measurement value cannot be acquired, and the protection control becomes impossible. Therefore, it is preferable to acquire the temperature measurement value via the internal bus. Note that the temperature measurement values may be acquired from both routes via the internal bus and the common bus 5.

  Although not shown, the indoor unit A2 has the same configuration as the indoor unit A1.

  In the outdoor unit B, various devices (including some sensors) 61 such as the compressor 11, the four-way valve 12, the outdoor fan 13 and the like (see FIG. 1), and various drivers provided corresponding to the various devices 61, respectively. 62, a gateway (communication means) 63, and an outdoor protection control unit 64 are provided. Each of these devices is connected to the common bus 5 via the internal bus and also via the gateway 63.

The outdoor protection control unit 64 is a function realized by, for example, a processor loading an outdoor protection program recorded in a computer-readable recording medium into a main storage device and executing the program. The outdoor protection control unit 64 acquires the high-pressure side pressure from the pressure sensor 21a (see FIG. 1) and the low-pressure side pressure from the pressure sensor 21b at a predetermined timing via the internal bus, and the low-pressure side pressure is preset. If it is less than or equal to the first threshold value, or if the high-pressure side pressure is greater than or equal to a preset second threshold value, it is determined that an emergency stop is necessary, and emergency stop control for stopping the compressor 11 is performed. . Further, the outdoor protection control unit 64 determines that the low pressure side pressure is equal to or lower than the third threshold value set to a value larger than the first threshold value, or the high pressure side pressure of the compressor 11 is smaller than the second threshold value. When the value is equal to or higher than the fourth threshold value set in, the protection control for reducing the rotation speed of the compressor 11 is performed.

  As will be described later, the outdoor protection control unit 64 can also obtain the low pressure side pressure and the high pressure side pressure from the pressure sensors 21a and 21b (sensors 20) via the common bus 5 and the gateway 53. . However, in this case, when the communication failure occurs in the common bus 5, the pressure measurement value cannot be acquired, and the emergency stop and the protection control cannot be performed. Therefore, it is preferable to acquire the high-pressure side pressure and the low-pressure side pressure via the internal bath. Note that the pressure measurement values may be acquired from both routes via the internal bus and the common bus 5.

  The gateways 53 and 63 are a group of functions including, for example, a communication driver, an address storage area, a device attribute storage area, an OS, and a communication framework. The address storage area is a storage area for storing a unique address that is assigned in advance to communicate with the control device 3 and the like. The device attribute storage area is an area for storing the attribute information of itself and the attribute information of the owned devices 51 and 61. For example, whether it is an indoor unit or an outdoor unit, capability, installed sensors ( For example, information such as a temperature sensor, a pressure sensor, etc., device information (for example, the number of fan taps, a full pulse of a valve, etc.) is stored.

  Further, the sensors 20 (for example, a pressure sensor that measures the refrigerant pressure, a temperature sensor that measures the refrigerant temperature, etc.) provided in the outdoor unit B and the indoor units A1 and A2 are respectively connected to the common bus 5 via the AD board 71. It is connected to the. Here, when the measurement accuracy of the sensors 20 is low, a node having a correction function for correcting the measurement value may be provided between the AD board 71 and the sensors 20. In this way, by providing the correction function, it is possible to use inexpensive sensors that are not so high in measurement accuracy as the sensors 20.

In such an air conditioning system 1 , for example, the indoor unit control units 41 and 42 of the control device 3 acquire measurement data and control information from the sensors 20 and various drivers 52 and 62 via the common bus 5, and By executing a predetermined indoor unit control program based on the measurement data of, the control command is output to various devices (for example, the indoor fan 32, the electronic expansion valve 33, etc.) provided in the indoor units A1 and A2. To do. The control command is sent to the various drivers 52 via the common bus 5 and the gateway 53. The various drivers 52 drive corresponding devices based on the received control commands. Thereby, control of the indoor units A1 and A2 based on the control command is realized.

  Similarly, the outdoor unit control unit 43 of the control device 3 acquires measurement data and control information from the sensors 20 and the various drivers 52 and 62 via the common bus 5, and based on these measurement data, a predetermined outdoor unit. By executing the machine control program, control commands are output to various devices (for example, the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the outdoor fan 15) provided in the outdoor unit B. The control command is sent to the various drivers 62 via the common bus 5 and the gateway 63. The various drivers 62 drive the corresponding devices based on the received control commands.

  FIG. 3 shows an example of a hierarchical structure of communication of the air conditioning system 1. As shown in FIG. 3, the air conditioning system 1 includes a hardware layer (hereinafter referred to as “HW layer”), a driver layer, an operation system layer (hereinafter referred to as “OS layer”), a framework layer, and an application layer. have.

  The HW layer is a common bus, a fan motor, a louver motor, and sensors. The driver layer has a communication driver for communication via the common bus 5, a device driver for driving a fan motor, a louver motor, and the like, and a sensor driver for driving sensors. In particular, since communication between the control device 3, the indoor units A1, A2, and the outdoor unit A3 is performed using the driver layer (information defined in the driver layer), communication is performed using the application layer and the framework layer. The amount of each piece of information communicated via the common bus 5 can be reduced as compared with the case where the information is transmitted.

  The framework layer has a communication framework, a device operation control framework, and setting parameters. The framework layer converts, for example, a physical unit and a control unit of an actual device. For example, the physical unit of opening the valve opening by 1% corresponds to 12 pulses of the stepping motor.

  The application layer has a function of operating a device of the indoor unit A1 according to a command from the common bus 5 or sending out device failure information, for example, and mainly has a device operation control application and a setting application. For example, the device operation control application is a program related to the control of various devices (for example, the indoor heat exchanger 31, the indoor fan 32, the electronic expansion valve 33, etc.) that configure the indoor unit A1, and, for example, starts up the indoor unit A1 and It is a program that performs control related to stoppage, changes in operating mode, set temperature, and other states.

The indoor units A1 and A2 and the outdoor unit B may be autonomously decentralized and controlled by the indoor unit control units 41 and 42 and the outdoor unit control unit 43, respectively. In this case, a control rule is set between the indoor units A1 and A2 and the outdoor unit B, and each controls according to this control rule. For example, when the refrigerant pressure is taken as an example, when the refrigerant pressure acquired from the sensors 20 is within a predetermined first allowable fluctuation range, the indoor units A1 and A2 set temperatures and settings set by the user or the like. A control command for matching the actual temperature and the actual air volume with the air volume is determined and output to the indoor units A1 and A2 via the common bus 5, respectively. Here, the indoor unit control units 41 and 42 may determine each control command by exchanging information and cooperating with each other. In addition, the outdoor unit control unit 43 controls the output command of the air conditioning system 1 for maintaining the refrigerant pressure within a predetermined second allowable fluctuation range, for example, the rotation speed of the compressor 11 and the rotation speed of the outdoor fan 15. The command is determined and transmitted to the outdoor unit B via the common bus 5.
For example, by setting the first permissible range wider than the second permissible range, the outdoor unit control unit 43 can determine the output change information of the indoor units A1 and A2 and determine the behavior of the outdoor unit B. It will be possible.

Next, an example of processing executed by the control device 3 will be described with reference to FIG.
FIG. 4 is a flowchart showing a processing procedure executed by the control device 3 when the air conditioning system is activated. First, when the air conditioning system 1 is activated, the master control unit 40 of the control device 3 is activated first. The activation of the master control unit 40 is realized by the CPU of the control device 3 executing a predetermined program. Here, the master control unit 40 is also a control unit that is virtually generated in the control device 3. The master control unit 40 transmits a connection device request (step SA1 in FIG. 4). As a result, the connection device request is transmitted to each connection device via the common bus 5. The gateways 53 of the indoor units A1 and A2 and the gateway 63 of the outdoor unit B that have received the connection device request read out the attribute information from the device attribute storage area, read out the address information from the address storage area, and associate them to control the controller. To 3 (step SA2).

As a result, the master control unit 40 acquires that the indoor units A1 and A2 and the outdoor unit B are connected as connected devices, and the installed devices and address information of each of the indoor units A1, A2 and the outdoor unit B.
The master control unit 40 grasps the number of connected devices based on the received attribute information, and arranges the virtual CPU and the memory area according to the number of connected devices (step SA3). As a result, virtual CPUs and memory areas corresponding to the indoor units A1 and A2 and the outdoor unit B are allocated in the control device 3. Next, the master control unit 40 acquires a control module corresponding to each attribute information from a control module storage unit (not shown) and generates a custom control program corresponding to each of the indoor units A1 and A2 and the outdoor unit B ( Step SA4).

Here, the control module is, for example, a control program provided corresponding to each of a plurality of devices (for example, a fan, an expansion valve, a compressor, etc.) included in the indoor units A1 and A2 and the outdoor unit B. In this way, by creating the control program for each control module, the custom control program can be customized according to the devices installed in each of the indoor units A1 and A2 and the outdoor unit B. As a result, the custom control program can be created with the minimum necessary control modules, and the memory capacity can be reduced.
As described above, instead of creating a custom control program for each control module, a general-purpose control program for indoor units and a general-purpose control program for outdoor units are prepared, and this general-purpose control program is used as it is. Good.
The control module storage unit may be provided in the control device 3 or may be provided on a server connected via a network. When downloading from an external server, the resources of the control device 3 can be effectively used.

  When the master control unit 40 generates the custom control programs corresponding to the indoor units A1 and A2 and the outdoor unit B, respectively, the master control unit 40 stores the custom control programs in the memory areas arranged earlier (step SA5). Subsequently, the master control unit 40 saves the memory image and the connected device information stored in each memory area in a master storage area (not shown) (step SA6). This is for promptly starting the second and subsequent times. Next, the master control unit 40 gives a startup instruction to each virtual CPU (step SA7). As a result, each virtual CPU executes the custom control program stored in the corresponding memory area to activate the indoor unit control units 41 and 42 and the outdoor unit control unit 43, and enter the ready state (step SA8). . That is, the indoor unit controllers 41 and 42 and the outdoor unit controller 43 are generated in the control device 3 by executing the custom control programs stored in the storage areas corresponding to the respective virtual CPUs.

  As a result, the indoor units A1 and A2 are controlled by the indoor unit controllers 41 and 42, and the outdoor unit B is controlled by the outdoor unit controller 43. In addition, after the indoor unit controllers 41 and 42 and the outdoor unit controller 43 are activated, the master controller 40 may be put into a dormant state or deleted. By deleting the master control unit 40, the CPU capability of the master control unit 40 can be made zero, and it is possible to avoid pressure on other resources.

In addition, in parallel with the control of the indoor units A1, A2 and the outdoor unit B by the indoor unit control units 41, 42 and the outdoor unit control unit 43, the protection control by the respective indoor protection control units 54 in the indoor units A1, A2 is performed. In the outdoor unit B, the outdoor protection control unit 64 performs emergency stop / protection control.
For example, the indoor protection control unit 54 of the indoor unit A1 determines whether or not the temperature of the indoor heat exchanger 31a is equal to or lower than a threshold value at predetermined time intervals, and if the temperature is equal to or lower than the threshold value, freezing may occur. As a result, the electronic expansion valve 33a is fully closed. Then, when such protection control is performed, information to that effect is notified to the indoor unit control section 41 in the control device 3 via the gateway 53.
Further, in the outdoor unit B, it is determined at predetermined time intervals whether the low pressure side pressure is equal to or lower than the third threshold value or the high pressure side pressure is equal to or higher than the fourth threshold value. The protection control for reducing the rotation speed of the compressor 11 is performed. In addition, at a predetermined time interval, it is determined whether the low pressure side pressure is equal to or lower than a first threshold value or the high pressure side pressure is equal to or higher than a second threshold value, and if this condition is satisfied, an emergency stop is required. Then, the compressor 11 is stopped urgently.
When such protection control or emergency stop control is performed, information to that effect is notified to the outdoor unit controller 43 in the control device 3 via the gateway 63.

  As described above, according to the air conditioning system 1 and the control method thereof according to the present embodiment, the indoor unit control units 41, 42 and the outdoor unit control unit 43 are integrated in the control device 3 and are virtualized. Generated with the controller. As a result, it is not necessary to provide a control unit in each of the indoor units A1, A2 and the outdoor unit B (excluding the CPU as a driver for driving various devices), and the indoor units A1, A2 and the outdoor unit B are The configuration can be simplified. As a result, cost reduction can be realized. Further, since the indoor units A1 and A2 and the outdoor unit B do not need to be loaded with a high-level program, the devices are not obsolete and can be partially updated (replaced). Furthermore, the control device 3 can update the program that is the source of the installed program, that is, the control module, to reflect the update in the control unit that is virtualized and generated. This makes it possible to easily upgrade the version of the entire system. Further, the hardware resources may be determined according to the scale of the air conditioning system 1, and the waste of CPU resources can be reduced.

  Further, since the indoor units A1 and A2 are provided with the indoor protection control unit 54 and the outdoor unit B is provided with the outdoor protection control unit 64, the indoor unit control units 41 and 42 provided in the control device 3 and the outdoor unit. A protection function can be provided as a configuration different from the control unit 43. Thereby, for example, even when a communication failure occurs in the common bus 5, the protection function can be continuously performed.

  In the present embodiment, the indoor unit control units 41 and 42 and the outdoor unit control unit 43 are integrated into the control device 3 and exist as a virtualized control unit, but it is not always necessary to take this aspect. For example, the indoor unit control units 41 and 42 and the outdoor unit control unit 43 may exist independently of the indoor units A1 and A2 and the outdoor unit B. Further, the indoor unit controllers 41 and 42 and the outdoor unit controller 43 may be provided on the cloud. Further, in the present embodiment, the control device 3 and each of the indoor units A1, A2 and the outdoor unit B2 are connected by the common bus 5, but the present invention is not limited to this aspect and, for example, each of the indoor unit control units 41, 42. The indoor units A1 and A2 respectively corresponding to the above may be set to perform one-to-one correspondence communication. In this way, by making the control unit (for example, the indoor unit control unit 41) and the corresponding device (for example, the indoor unit A1) perform one-to-one communication, it is possible to mitigate the communication delay due to the increase in the communication amount. . Further, since high-speed communication can be applied to the communication between the control units in the control device 3, it is possible to avoid the influence of the decrease in the communication speed due to the increase in the data amount.

  Further, the flap control and fan control in the indoor units A1 and A2 are not controlled by the indoor control units 41 and 42 generated in the control device 3, but are provided in the indoor units A1 and A2. (Not shown) may be implemented. The flap control and the fan control are controlled according to an instruction from the remote controller, and the control is completed by the indoor unit alone. Therefore, the flap control and the fan control may be handled as described above.

1 Air Conditioning System 3 Control Device 40 Master Control Unit 41, 42 Indoor Unit Control Unit 43 Outdoor Unit Control Unit 54 Indoor Protection Control Unit 64 Outdoor Protection Control Unit A1, A2 Indoor Unit B Outdoor Unit

Claims (5)

An outdoor unit including a communication unit and an outdoor protection control unit;
An indoor unit equipped with communication means,
A control device that exists independently of the outdoor unit and the indoor unit,
Equipped with
The control device is
While being able to communicate with the outdoor unit via a communication medium, an outdoor unit control unit that exists independently of the outdoor unit,
While being able to communicate with the indoor unit via a communication medium, an indoor unit control unit that exists independently of the indoor unit,
Equipped with
The outdoor unit controller and the indoor unit controller are capable of exchanging information,
The outdoor unit control unit acquires information about a device mounted in the outdoor unit via the communication medium, and outputs a control command to the device mounted in the outdoor unit,
The indoor unit control unit acquires information on a device mounted in the indoor unit via the communication medium, and outputs a control command to the device mounted in the indoor unit,
The outdoor protection control means determines whether or not a preset emergency stop condition is satisfied, and when the emergency stop condition is satisfied, stops the compressor,
The outdoor unit control unit and the indoor unit control unit are mounted on the control device as a virtualized control unit ,
The control device has a master control unit,
The master control unit, at startup, acquires the attribute information of the indoor unit and the outdoor unit connected to the communication medium,
An air conditioning system that generates the virtualized indoor unit controller and the virtualized outdoor unit controller based on the attribute information .   The outdoor protection control means satisfies the emergency stop condition when the low pressure side pressure is equal to or lower than a preset first threshold value or when the high pressure side pressure is equal to or higher than a preset second threshold value. The air conditioning system according to claim 1, wherein the air conditioner system makes a determination and stops the compressor.   The outdoor protection control means sets the low pressure side pressure to a third threshold value or less set to a value larger than the first threshold value, or sets the high pressure side pressure to a value smaller than the second threshold value. The air-conditioning system according to claim 2, wherein protection control is performed to reduce the rotation speed of the compressor when it is equal to or higher than a predetermined fourth threshold value.   The said indoor unit is provided with the indoor protection control means which makes an expansion valve fully-closed state, when the temperature of a heat exchanger is below the preset 5th threshold value. Air conditioning system as described. The outdoor unit control unit outputs a control command to a driver that drives the device mounted in the outdoor unit,
The air conditioning system according to claim 1, wherein the indoor unit control unit outputs a control command to a driver that drives the device mounted on the indoor unit.

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