CN115875808A - Centralized control system - Google Patents

Abstract

The invention discloses a centralized control system, wherein the centralized controller comprises: a main control unit; a communication loop; the address setting unit is used for setting a communication address of the centralized controller; the level setting unit is used for setting the priority of the centralized controller; only one highest-priority integrated controller is set in the plurality of integrated controllers as a master integrated controller, and the rest integrated controllers are slave integrated controllers; the master centralized controller is communicated with the air conditioning unit, each slave centralized controller is communicated with the master centralized controller, and the master centralized controller forwards the state information of the air conditioning unit to each slave centralized controller; the control instruction of the main centralized controller is directly issued to the air conditioning unit; the control instruction of each slave centralized controller is issued to the air conditioning unit through the master centralized controller; and forwarding the control instructions issued by the slave centralized controllers through the master centralized controller based on the priority of each current slave centralized controller issuing the control instructions. The invention can realize the hierarchical control of a plurality of centralized controllers and meet the use flexibility in multiple scenes.

Description

Centralized control system

Technical Field

The invention relates to the technical field of centralized control, in particular to a centralized control system.

Background

The centralized controller of the central air conditioner is mainly divided into a local end and a remote end for convenient operation brought to users. The remote end is mainly accessed to the network in a wired mode (such as LAN) or a wireless mode (such as 4G, NB-Iot, wiFi and the like), can acquire state parameters of the air conditioning unit and send the state parameters to the centralized controller, and receives a control instruction sent by the centralized controller in the air conditioning unit.

The system design of the conventional centralized controller is shown in fig. 1, and includes a Main Control Unit (MCU) 10, a communication loop 20, a communication interface 30, and a power loop 40.

Wherein the communication loop 20 is responsible for communicating with the air conditioning unit; the communication interface 30 is used for connecting a touch/display module (used for displaying and controlling the local state of the air conditioner), a remote APP end or PC end upper computer (used for displaying and controlling the remote state of the air conditioner); the touch/display module is used for displaying and controlling the local state of the air conditioner; the power supply loop 40 provides power for the centralized control system.

Currently, for remote-end centralized applications, for example, the field of remote control using APP or Web end, hierarchical management of a central air conditioner can be easily achieved, authority allocation can be performed according to different users, a highest administrator can allocate control authority to other administrators or end users, and thus, multi-level authority management can be achieved. The local centralized controller can be used by connecting a plurality of local centralized controllers in parallel on the bus, but the local centralized controller is used in a flat level mode and lacks a hierarchical management function.

Even if the authority is distributed through remote APP and the like, the control of the central air conditioner by the remote APP and the like is in a level, even if a highest administrator issues a certain control instruction to the central air conditioner, a common administrator or an end user can adjust the central air conditioner for the second time, the control instruction is not classified in a level manner, and only is classified in a sequence manner.

In some special application occasions, for example, in hospitals, governments and other units, it has become a demand to realize the hierarchical control of the central air conditioner, for example, the manager with the highest level authority controls a certain temperature, while the manager with the lower level authority cannot modify the temperature, and only the manager with the higher authority can operate the temperature, so that the chaotic control is avoided.

Disclosure of Invention

The invention provides a centralized control system which can perform priority division on a plurality of centralized controllers mounted on a communication bus, realize hierarchical control on an air conditioning unit, avoid the problem of control confusion and effectively reduce the occupancy rate of the communication bus.

The application provides a centralized control system for connect a plurality of centralized controllers on same communication bus, centralized controller includes:

the main control unit is used for executing the centralized control function of the air conditioning unit;

the communication loop is connected with the main control unit and is used for transmitting a communication message on the communication bus;

the address setting unit is connected with the main control unit and used for setting communication addresses of the integrated controllers and the air conditioning unit, and the communication addresses of the integrated controllers are different from each other;

the level setting unit is connected with the main control unit and is used for setting the priority of the centralized controller;

only one centralized controller with the highest priority is set in the plurality of centralized controllers as a master centralized controller, and the rest centralized controllers are slave centralized controllers.

According to the communication control method and device, the address setting unit and the level setting unit are used for ensuring that a plurality of centralized controllers on the same communication bus can carry out hierarchical control through the set priority while mutually not interfering communication, and hierarchical management of the plurality of centralized controllers is facilitated.

In some embodiments of the present application, the master centralized controller communicates with the air conditioning unit, each slave centralized controller communicates with the master centralized controller, and the master centralized controller synchronizes the status information of the air conditioning unit to each slave centralized controller, so that each slave centralized controller can update the status information synchronously through the master centralized controller.

And the control instruction of the main centralized controller is directly issued to the air conditioning unit. In addition, the control instruction of each slave centralized controller is issued to the air conditioning unit through the master centralized controller; and forwarding the control instructions issued by the slave centralized controllers through the master centralized controller based on the priorities of the current slave centralized controllers issuing the control instructions.

The master centralized controller with the highest priority is arranged in the centralized control system, the master centralized controller forwards state information to enable the remaining slave centralized controllers to synchronize the state information, and air conditioner control instructions from the slave centralized controllers are forwarded to the air conditioning unit through the master centralized controller based on the priorities of the slave centralized controllers, so that the absolute master right of the master centralized controller is realized.

In some embodiments in the application, based on the priority of each current slave centralized controller issuing a control instruction, the master centralized controller is controlled to forward the control instruction issued by the slave centralized controller, specifically:

based on the priority of each slave centralized controller which issues the control instruction, forwarding the control instruction which is higher than or equal to the priority issued by the slave centralized controller of the current centralized controller through the master centralized controller, and enabling the forwarded control instruction to control the current state of the air conditioning unit;

wherein the current centralized controller is a slave centralized controller used for setting the current state of the air conditioning unit.

In some embodiments of the present application, the level setting unit is a step dial switch.

The priority of a plurality of centralized controllers can be set through the hierarchical dial switch, and the priority can be classified into a plurality of types, such as 3 types, 5 types and the like.

Different priority values may also be set for different priorities, i.e. priority values and priorities are in one-to-one correspondence.

In some embodiments of the present application, the master centralized controller searches for a slave centralized controller on the communication bus, and establishes a mapping table corresponding to the searched slave centralized controller, where the mapping table stores communication addresses and priorities of the slave centralized controllers;

and the slave centralized controller periodically sends an online communication message to the master centralized controller so as to identify the online state of the slave centralized controller and update the mapping table.

Therefore, the master centralized controller can know the communication address and the priority of the slave centralized controller, and the master centralized controller can conveniently realize the hierarchical control of each slave centralized controller.

In some embodiments of the present application, the master centralized controller establishes a state parameter table corresponding to the searched air conditioning unit by searching the air conditioning unit on the communication bus, and the state parameter table stores an air conditioning address and state information of the air conditioning unit mounted on the communication bus.

The slave centralized controller can synchronize the state information through the master centralized controller, so that the master centralized controller can firstly acquire the state information, and the master centralized controller can be used as a transfer station to transfer and send the state information.

In some embodiments of the present application, in order to avoid that any setting of the centralized controller can change the state information of the air conditioning unit, a centralized disable bit is set to prevent the slave centralized controller with low priority from operating the air conditioning unit.

In some embodiments of the present application, the master centralized controller broadcasts status information to each slave centralized controller on the communication bus in a broadcast manner, so as to achieve the purpose of fast synchronization;

after receiving and responding to the master centralized controller, the slave centralized controller determines the synchronized state information of the slave centralized controller;

and when the master centralized controller does not receive the response from the slave centralized controller, the master centralized controller retransmits for preset times to ensure that whether the slave centralized controller synchronizes the state information or not is reliably confirmed.

In some embodiments of the application, each centralized controller may set a centralized prohibition bit, the master centralized controller stores the centralized prohibition bits of each slave centralized controller, and the setting of the centralized prohibition bits is to avoid the slave centralized controller with a low priority from randomly controlling the air conditioning unit, or to avoid the slave centralized controller with a high priority from controlling the air conditioning unit and having the same centralized prohibition bit, so as to implement hierarchical control on the air conditioning unit, and ensure that the centralized controller with a high priority has a priority control right.

The centralized forbidding bit represents a state value indicating whether the state information is forbidden or not, and is divided into a valid state and an invalid state.

When the centralized forbidding bit is valid, the state information corresponding to the centralized forbidding bit can be set only from the centralized controller side, and when the centralized forbidding bit is invalid, the centralized forbidding bit is not set.

In some embodiments of the present application, the priority of the master centralized controller is the highest, and therefore, when the master centralized controller sets the centralized disable bit and is valid, the master centralized controller may shield all the air conditioning control instructions issued by the slave centralized controller, and the master centralized controller directly issues the air conditioning control instructions to the air conditioning unit.

When the slave centralized controllers set the centralized prohibition bits and are effective, whether the air-conditioning control instruction is forwarded to the air-conditioning unit through the master centralized controller is judged based on the priority of each slave centralized controller and the centralized prohibition bits, so that the air-conditioning control instruction controls the air-conditioning state corresponding to the effective centralized prohibition bits.

In this way, the slave centralized controller having higher priority than the slave centralized controller determines based on the central prohibition bit of the slave centralized controller having higher priority than the slave centralized controller, and further implements the hierarchical control of the slave centralized controller.

In some embodiments of the present application, the master centralized controller may obtain the centralized disable bit of each slave centralized controller in advance through the communication bus, and therefore, the master centralized controller performs broadcast query to each slave centralized controller on the communication bus, and establishes a disable bit table corresponding to the queried slave centralized controller, where the disable bit table stores the communication address, the priority, and the centralized disable bit corresponding to the centralized disable instruction of the slave centralized controller.

In some embodiments of the present application, whether the control instruction can be issued by other slave controllers is determined by determining whether the same centralized disable bit exists in other slave controllers having higher priority than the slave controller.

Therefore, whether an air conditioner control instruction is forwarded to the air conditioning unit through the main centralized controller is judged, specifically:

s1: the slave centralized controller sends an air conditioner control instruction corresponding to the centralized forbidden bit;

s2: the master centralized controller receives the air conditioner control command through the communication bus and replies a response command;

s3: the master centralized controller inquires the centralized forbidding bit table, inquires whether a slave centralized controller with the priority higher than that of the slave centralized controller sets a centralized forbidding bit which is the same as the centralized forbidding bit, if so, returns to S2, and if not, proceeds to S4;

s4: and the main centralized controller forwards the air conditioner control command to the air conditioning unit.

Drawings

FIG. 1 shows a system diagram of a centralized control system;

FIG. 2 illustrates a system diagram of a centralized control system according to some embodiments;

FIG. 3 illustrates priorities set by the centralized controllers in the centralized control system, in accordance with some embodiments;

FIG. 4 illustrates a mapping table established by a master hub in a centralized control system, in accordance with some embodiments;

FIG. 5 illustrates a flow diagram for handshaking communication by a master hub after initial power-up in a centralized control system, in accordance with certain embodiments;

FIG. 6 illustrates a state parameter table established by a master hub in a centralized control system, in accordance with some embodiments;

FIG. 7 illustrates a centralized inhibit bit table established by a master hub in a centralized control system in accordance with some embodiments;

FIG. 8 illustrates a signal line diagram between an air conditioning unit, a master cluster controller, and a slave cluster controller in a cluster control system according to some embodiments;

FIG. 9 illustrates a flow diagram for a master hub updating a centralized inhibit bit table in a centralized control system, in accordance with some embodiments;

fig. 10 illustrates a flow chart of issuing air conditioning control commands when a central inhibit bit is set from a centralized controller in a centralized control system according to some embodiments.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The centralized control system shown in fig. 1 is used for centralized control of a central air conditioner, can realize local end and remote end control, and needs to be networked through a wireless communication unit and log in the centralized control system for operation if the centralized control system is used for remote end control and remote data uploading.

The basic principle of the air conditioning assembly is described below.

The air conditioning unit performs a cooling and heating cycle of the air conditioning unit by using a compressor, a condenser, an expansion valve, and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

The low-temperature and low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas in a high-temperature and high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioning unit may regulate the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioning unit refers to a portion of a refrigeration cycle including a compressor, an outdoor heat exchanger, and an outdoor fan, the indoor unit of the air conditioning unit includes a portion of an indoor heat exchanger and an indoor fan, and a throttling device (such as a capillary tube or an electronic expansion valve) may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioning unit performs a heating mode when the indoor heat exchanger functions as a condenser, and performs a cooling mode when the indoor heat exchanger functions as an evaporator.

The indoor heat exchanger and the outdoor heat exchanger are switched to be used as a condenser or an evaporator, a four-way valve is generally adopted, and specific reference is made to the setting of a conventional air conditioning unit, which is not described in detail herein.

The refrigeration working principle of the air conditioning unit is as follows: the compressor works to enable the interior of the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger to become cold air which is blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the outdoor fan, so that the refrigeration effect is achieved by circulation.

The heating working principle of the air conditioning unit is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.

The central air conditioner is connected with the plurality of centralized controllers through the communication bus, and the centralized control of the plurality of centralized controllers is realized.

Referring to fig. 2, the present application further sets a communication address of the centralized controller through an address setting unit 50, so as to ensure that a plurality of centralized controllers on the same communication bus can not interfere with each other.

It should be noted that each centralized controller has a communication address, and the communication addresses of every two centralized controllers are different from each other, so that the communication of the air conditioning unit on the communication bus by the centralized controllers with different communication addresses is not interfered with each other.

In some special situations, it is necessary to perform hierarchical control on a plurality of centralized controllers mounted on the same communication bus, so as to avoid using the centralized controllers to arbitrarily change state information (e.g., on/off, temperature, air volume, mode, etc.).

With continued reference to fig. 2, in order to perform hierarchical control on a plurality of centralized controllers, in some embodiments of the present application, the centralized controller further includes a level setting unit 60, which is connected to the main control unit 10.

The level setting unit 60 is used to set the priority of the centralized controller.

In some embodiments of the present application, the level setting unit 60 selects the dial switch, and the number of bits of the dial switch can be selected according to the kind of priority required.

Two-bit dip switches may be selected, defining three priorities: high priority (01), medium priority (10) and low priority (11), and if 00 occurs, no classification is indicated.

Corresponding to the priority, a numerical value corresponding to the priority may be set, for example, a numerical value of 01 or 1 indicates a high priority, a numerical value of 10 or 2 indicates a medium priority, and a numerical value of 11 or 3 indicates a low priority.

In some embodiments of the present application, a priority is set for each of the plurality of centralized controllers.

For example, six centralized controllers with different communication addresses are connected to the communication bus at the same time, and the priority as shown in fig. 3 may be set.

It is desirable and only necessary to set one centralized controller with the highest priority, which may be referred to as a master centralized controller.

That is, the centralized controller corresponding to the communication address 0xA0 in fig. 3 is the master centralized controller, and the remaining centralized controllers are the slave controllers.

The rest centralized controllers are set according to actual needs without limitation.

For example, as shown in fig. 3, three centralized controllers having medium priority are set, and two centralized controllers having low priority are set.

As described above, three levels of priority are set: high, medium and low priority; two levels of priority may also be set: high and medium priority, or high and low priority, etc.

In some embodiments of the present application, the number of priorities may also be other numbers, such as four, respectively referred to as high priority, first priority, second priority and low priority, wherein the high priority, first priority, second priority and low priority are sequentially lower.

In some embodiments of the present application, for hierarchical control of the centralized controller, once the priorities are divided by the level setting unit, corresponding priorities must be assigned, and no priority is allowed.

When the priority of the multiple centralized controllers is not divided, no authority classification function is defaulted, and the priority is consistent with the level control of the existing centralized controller.

As above, priority setting for a plurality of centralized controllers is described.

Thus, each centralized controller has a communication address and a priority.

The task division of the master centralized controller and the slave centralized controller is different.

In terms of communication, referring to fig. 8, only the master centralized controller is allowed to communicate with the air conditioning unit, and the slave centralized controller communicates with the master centralized controller.

The master centralized controller is generally used by the highest administrator and has the highest control authority.

The main centralized controller is responsible for: (1) Searching the number, air conditioner address and state information of the air conditioner units hung on the communication bus; (2) Searching the number, communication addresses and priorities of slave controllers on a communication bus; (3) Forwarding the state information to the slave centralized controller to enable the slave centralized controller to synchronize the state information; (4) And receiving an air conditioner control command sent from the centralized controller and forwarding the air conditioner control command to the air conditioning unit.

The master centralized controller can establish a state parameter table of the air conditioning unit when (1) as described above is completed, see fig. 6.

The air-conditioning address may refer to an address formed by combining a system number and an address number in the central air-conditioning system. The state information Argi (i =1,2, … n) may be, for example, a switch, a mode, a temperature, an air volume, or the like.

The master can establish a mapping table for the slave upon completion of (2) as described above, see fig. 4.

The slave centralized controller can be distributed to a common administrator or an owner for use, only communicates with the master centralized controller, acquires the state information of all the air conditioning units from the master centralized controller, or sends an air conditioning control instruction to the air conditioning units to the master centralized controller.

Meanwhile, the slave centralized controller periodically sends an online communication message to the master centralized controller, and identifies the online state of the slave centralized controller, so that the master centralized controller updates the mapping table.

As described above, the communication relationship between the master centralized controller and the slave centralized controller and the task division of work in the communication process are described.

As follows, referring to fig. 5 and 8, during the communication process, the communication connection between the master centralized controller and the slave centralized controller is established according to the handshake flow.

(1) After initial power-on

And initially electrifying, wherein all the slave centralized controllers are in a silent state, the master centralized controller and the air conditioning unit are only communicated, and the slave centralized controller synchronizes the state information of the air conditioning unit through the master centralized controller after the master centralized controller and the air conditioning unit finish handshaking.

The specific description is as follows.

(11) Powering on

The power supply loop of the integrated controller supplies power to the integrated controller.

(12) All slave controllers are in a silent state

Since the slave centralized controller only communicates with the master centralized controller, the slave centralized controller is in a silent state before the master centralized controller communicates with the air conditioning unit.

(13) Air conditioning unit with main centralized controller for searching

The main centralized controller searches the number, communication address, status information and the like of the air conditioning units connected on the current communication bus, and after the searching is finished, the status parameter table corresponding to the air conditioning units is established.

(14) Searching slave centralized controller by master centralized controller

(a) After all the air conditioning units are searched, the master centralized controller performs broadcast query to other slave centralized controllers to search all the slave centralized controllers on the communication bus.

In the present application, in order to ensure the reliability of the broadcast query, the query is broadcast twice, and after receiving the same reply ACK from the centralized controller each time, the mapping table corresponding to the slave centralized controller as described above is established.

(b) In some embodiments of the present application, the centralized controller also sets a centralized disable bit.

Namely, the master centralized controller can set a centralized forbidden bit, the slave centralized controller can also set a centralized forbidden bit, and the setting of the master centralized controller and the setting of the slave centralized controller are not interfered with each other.

The centralized disable bit represents a state value of whether state information (e.g., switch, mode, temperature, air volume, etc.) is disabled, and is divided into two states: a valid state and an invalid state.

The valid state can be represented by a state value "1", and the invalid state can be represented by a state value "0".

For example, the centralized disable bit is a disable mode switch, and when the state value of the disable mode switch is 1 (i.e., valid), the default centralized disable bit is released when the state value is 0.

When the centralized prohibition bit is valid, that is, the line controller is locked, the user is not allowed to operate from the line controller, for example, when the prohibition mode switching is set, the user cannot switch the mode from the line controller, and only the mode switching can be performed from the centralized controller side, or after the centralized prohibition bit is removed by the centralized controller, the line controller can perform the mode switching.

And setting a centralized forbidding bit through the centralized controller, and performing hierarchical control on other centralized controllers with higher priority than the slave centralized controller to be operated currently (see the following description specifically).

When each centralized controller is provided with a centralized forbidding position, after all air conditioning unit searches, and when the master centralized controller broadcasts and inquires other slave centralized controllers, the master centralized controller searches all the slave centralized controllers on the communication bus, and acquires the centralized forbidding positions of all the centralized controllers besides acquiring the communication addresses and the priority ultraviolet of all the slave centralized controllers as described in (a).

In the application, in order to ensure the reliability of the broadcast query, the query is broadcast twice respectively, and the same response command ACK replied from the centralized controller is received each time.

The master centralized controller stores the searched communication addresses, priorities and centralized disable bits of all the slave centralized controllers to form a centralized disable bit table, see fig. 7.

The priority may be represented by high, medium, and low levels, or may be represented by a numerical value corresponding to the priority level.

For example, forbid0 may represent a disabled mode switch, which has an active state and an inactive state; forbid1 may represent an inhibit temperature setting having an active state and an inactive state.

(15) Synchronizing state information from master to slave

The master centralized controller also sends the state information of the air conditioning unit to each slave centralized controller on the communication bus in a broadcasting mode, and the purpose of quickly synchronizing each slave centralized controller is achieved.

And each slave centralized controller receives the broadcast information and respectively replies an Acknowledgement (ACK), and the master centralized controller considers that the slave centralized controller receives the broadcasted state information, so that the state information is synchronized.

And the master centralized controller judges whether the response instructions ACK of all the slave centralized controllers are received or not, and if the master centralized controller does not receive the response instructions ACK, the master centralized controller retransmits for a preset number of times.

And after the preset times, when the master centralized controller still does not receive the response instruction ACK fed back by the slave centralized controller, the master centralized controller indicates that the synchronization state information of the corresponding slave centralized controller is unsuccessful.

As above, the handshake communication after the initial power-on is completed, and as follows, the normal control phase is entered.

(2) General control phase

Referring to fig. 8, in the normal control phase, when the status information of the air conditioning unit changes, the master centralized controller still broadcasts the status information of the air conditioning unit to the communication bus in a broadcast manner, so as to synchronize the current status information of the air conditioning unit to all the slave centralized controllers.

Referring to fig. 8 to 10, two aspects are explained for issuing the air conditioner control command.

(21) All centralized controllers (including the master centralized controller and all slave centralized controllers) are not provided with centralized forbidden bits or the centralized forbidden bits are invalid states

(a) When the main centralized controller issues the air conditioner control instruction

Because the priority of the main centralized controller is highest, when the main centralized controller issues the air conditioner control instruction, the main centralized controller directly issues the air conditioner control instruction to the air conditioning unit.

(b) When the air conditioner control instruction is issued from the centralized controller

Because the slave centralized controller is communicated with the master centralized controller but not communicated with the air conditioning unit, the master centralized controller receives the air conditioning control command and forwards the air conditioning control command to the air conditioning unit.

The air conditioner control command is specifically issued by which centralized controller, and needs to be determined based on the priority of the centralized controller.

For the purpose of convenient description, note: the current slave hub operated (i.e., the slave hub currently issuing the air conditioning control command) is slave hub a, where the air conditioning control command may be, for example, a mode switch, and has currently been switched to the cooling mode.

Since the master has the highest priority, the master has the highest absolute control right, and only the slave will be described below.

If the mode of the air conditioning unit needs to be switched, it needs to be determined from which slave controller or slave controllers the air conditioning control command corresponding to the mode switching can be issued, which is described below.

The master centralized controller queries the slave centralized controllers with higher priority than the slave centralized controller a through the mapping table in fig. 4, and any one of the acquired slave centralized controllers can issue an air conditioner control instruction corresponding to mode switching and forward the air conditioner control instruction to the air conditioning unit through the master centralized controller, thereby realizing air conditioner state control.

For example, if the slave centralized controller B with higher priority than the slave centralized controller a is queried, the slave centralized controller may issue an air conditioning control command for mode switching, so that the mode of the air conditioning unit is changed from the current cooling mode, for example, to a heating mode.

And the priority is less than from centralized control ware A from the centralized control ware, can be shielded, can't realize the mode switch control to air conditioning unit.

In this way, by using the priority of the centralized controller, the slave centralized controller with low priority can be prevented from modifying the set state information, and the hierarchical control of the centralized controller can be realized.

After the air conditioner control instruction is issued, as described above, the master centralized controller broadcasts the status information in a broadcast manner, so as to synchronize the status information to the slave centralized controllers.

(22) When the centralized controller sets the centralized forbidding bit and is in an effective state

Referring to fig. 9, the master hub updates the centralized inhibit bit table when the centralized inhibit bit in the slave hub changes.

(a) When the master centralized controller sets the effective centralized forbidden bit

Because the master centralized controller has the highest priority, the master centralized controller can shield air conditioner control instructions from other slave centralized controllers and only execute the air conditioner control instructions which are issued by the master centralized controller and control the air conditioner unit.

For example, the master centralized controller sets a prohibition mode switching, the line controller cannot switch the mode, and cannot switch from other slave centralized controllers, and only the master centralized controller can realize the mode switching, so that the highest priority of the master centralized controller is ensured.

When the master centralized controller sets the valid centralized disable bit as described above, the slave centralized controller is masked and not executed regardless of whether the centralized disable bit is set.

(b) When the slave centralized controller sets the effective centralized forbidden bit and the master centralized controller does not set the centralized forbidden bit

Since the master cluster controller has the highest priority, the control of the air conditioning unit by the master cluster controller is not affected (i.e., can be performed).

Whether the air conditioner control command issued by other slave centralized controllers can be executed depends on the priority of other slave centralized controllers and the respective centralized prohibition bits.

The following description can be made with specific reference to fig. 10.

S1: and sending an air conditioner control instruction corresponding to the centralized forbidden bit from the centralized controller.

For example, a valid centralized disable bit is set from hub B and the centralized disable bit is a disable mode switch.

For example, a master centralized controller, a slave centralized controller C, and a slave centralized controller B are taken as an example, where the priority of the master centralized controller, the priority of the slave centralized controller C, and the priority of the slave centralized controller B are sequentially lowered.

The slave cluster controller in S1 may be one of the slave cluster controller C and the slave cluster controller B, and the air-conditioning control instruction in S1 refers to mode switching.

As described above, the master cluster controller has the highest priority control right as to whether the air conditioner control command issued from one of the slave cluster controller C and the slave cluster controller B can be executed, depending on two aspects: 1. priority of the slave centralized controller C relative to the slave centralized controller B; 2. slave B and slave C centralize disable bits.

For example, the air conditioner control command corresponding to the centralized disable bit is issued from the centralized controller B, that is, the air conditioner control command for mode switching is issued from the centralized controller B.

S2: the main centralized controller receives the air conditioner control command through the communication bus and replies a response command.

Because the slave centralized controllers are connected with the master centralized controller through the communication buses, the air conditioner control instructions issued by the slave centralized controller B can be received by the master centralized controller.

Upon receipt, the slave B is replied with a response instruction.

S3: and the master centralized controller inquires the centralized forbidden bit table, inquires whether a slave centralized controller with the priority higher than that of the slave centralized controller is provided with a centralized forbidden bit which is the same as the centralized forbidden bit, if so, returns to S2, and if not, proceeds to S4.

As described in S1, the priority and the centralized disable bit of slave controllers B and C need to be determined.

Also, the master centralized controller as described above stores the centralized prohibition bit table, and therefore the master centralized controller inquires the centralized prohibition bit table, and inquires the priority and the centralized prohibition bits in the slave centralized controllers B and C.

The master centralized controller inquires the centralized forbidding bit table and inquires whether a slave centralized controller with higher priority than the slave centralized controller B is provided with a centralized forbidding bit which is the same as the centralized forbidding bit.

(1) The master centralized controller inquires that the slave centralized controller C has higher priority than the slave centralized controller B, and the centralized disable bit of the slave centralized controller C is in the disable mode switching and is in the active state (i.e., the slave centralized controller C has the same centralized disable bit as the centralized disable bit of the slave centralized controller), so returning to S2, the master centralized controller receives the air conditioner control command issued by the slave centralized controller C.

Then, the process proceeds to S3 to inquire whether a slave centralized controller having a higher priority than the slave centralized controller C is provided with a centralized disable bit identical to the centralized disable bit.

The master centralized controller does not inquire that a slave centralized controller with higher priority than the slave centralized controller C exists, namely, does not inquire that a slave centralized controller with higher priority than the slave centralized controller C is provided with the same centralized forbidding bit.

Therefore, the slave cluster controller C masks the air conditioning control command that the slave cluster controller B can issue for switching the mode to change the air conditioning control mode (see S4).

The slave cluster controller B is shielded, that is, the air conditioner control instruction for switching the mode issued by the slave cluster controller B is not executed.

Here, S2 and S3 are executed in a loop, and the control right of the slave centralized controller having the same centralized prohibition bit of the highest priority to the air conditioning unit is ensured, that is, the slave centralized controller C is ensured to have the highest control right among the slave centralized controllers.

(2) The master centralized controller inquires that the slave centralized controller C has higher priority than the slave centralized controller B, and the centralized disable bit of the slave centralized controller C is the disabled mode switching and is in an invalid state or the centralized disable bit does not disable the mode switching (i.e. the slave centralized controller C does not have the same centralized disable bit as the centralized disable bit of the slave centralized controller).

Thus, the air-conditioning control mode can be changed by issuing an air-conditioning control instruction for switching the mode from the centralized controller C.

At this time, the slave controller B can also issue an air conditioning control command for switching the modes.

It should be noted that, if the priority of each of the other slave controllers is lower than the priority of the slave controller B, the air conditioner control commands issued by the other slave controllers are all shielded and not executed.

S4: and the main centralized controller transmits the air conditioner control command to the air conditioning unit.

As described in S3 (1), the air conditioning control command for switching the mode issued by the slave centralized controller C can be forwarded to the air conditioning unit through the master centralized controller.

As described in S3 (2), the air conditioner control instruction for switching the mode issued from the centralized controller B can be forwarded to the air conditioning unit through the main centralized controller, or the air conditioner control instruction for switching the mode issued from the centralized controller C can also be forwarded to the air conditioning unit through the main centralized controller.

The centralized control system can realize the hierarchical control of a plurality of centralized controllers mounted on the same communication bus; and specific hierarchical control content can be realized by setting a centralized prohibition position through the centralized controller, so that the flexibility is high, and the low-priority centralized controller is prevented from arbitrarily setting the air conditioning unit.

In addition, the highest priority can be controlled by flexibly setting the centralized prohibition bit in the high-priority centralized controller, the highest control use in a special scene is realized, and the centralized control system can be flexibly used in different scenes.

And the number of the centralized controllers which can communicate on the communication bus at the same time can be flexibly changed by hierarchical control, the occupancy rate of the communication bus is effectively reduced, and the communication efficiency is improved.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A centralized control system is used for connecting a plurality of centralized controllers on the same communication bus, and the centralized controller comprises:

the main control unit is used for executing the centralized control function of the air conditioning unit;

the communication loop is connected with the main control unit and is used for transmitting a communication message on the communication bus;

the address setting unit is connected with the main control unit and used for setting communication addresses of the integrated controllers and the air conditioning unit, and the communication addresses of the integrated controllers are different from each other;

the level setting unit is connected with the main control unit and is used for setting the priority of the centralized controller;

only one centralized controller with the highest priority is set in the plurality of centralized controllers as a master centralized controller, and the rest centralized controllers are slave centralized controllers;

the master centralized controller is communicated with the air conditioning unit, each slave centralized controller is communicated with the master centralized controller, and the master centralized controller synchronizes the state information of the air conditioning unit to each slave centralized controller;

the control instruction of the main centralized controller is directly issued to the air conditioning unit;

the control instruction of each slave centralized controller is issued to the air conditioning unit through the master centralized controller;

and forwarding the control instructions issued by the slave centralized controllers through the master centralized controller based on the priorities of the current slave centralized controllers issuing the control instructions.

2. The centralized control system according to claim 1, wherein based on the priority of each slave centralized controller currently issuing a control instruction, the master centralized controller is controlled to forward the control instruction issued by the slave centralized controller, specifically:

based on the priority of each slave centralized controller which issues the control instruction, forwarding the control instruction which is higher than or equal to the priority issued by the slave centralized controller of the current centralized controller through the master centralized controller, and enabling the forwarded control instruction to control the current state of the air conditioning unit;

and the current centralized controller is a slave centralized controller used for setting the current state of the air conditioning unit.

3. The centralized control system of claim 1, wherein the level setting unit is a hierarchical dip switch.

4. The centralized control system of claim 1,

the master centralized controller searches the slave centralized controllers on the communication bus to establish a mapping table corresponding to the searched slave centralized controllers, and the mapping table stores the communication addresses and the priorities of the slave centralized controllers;

and the slave centralized controller periodically sends an online communication message to the master centralized controller so as to identify the online state of the slave centralized controller and update the mapping table.

5. The centralized control system of claim 1,

the master centralized controller searches the air conditioning units on the communication bus to establish a state parameter table corresponding to the searched air conditioning units, and the state parameter table stores the air conditioning address and the state information of the air conditioning units mounted on the communication bus.

6. The centralized control system of claim 1,

the master centralized controller broadcasts state information to each slave centralized controller on the communication bus in a broadcasting mode;

after receiving and responding to the master centralized controller from the slave centralized controller, determining the synchronized state information of the slave centralized controller;

and when the master centralized controller does not receive the response from the slave centralized controller, the master centralized controller retransmits for a preset number of times.

7. The centralized control system of claim 1,

each centralized controller can be provided with a centralized forbidden bit, and the master centralized controller stores the centralized forbidden bit of each slave centralized controller;

the centralized forbidding bit represents a state value indicating whether the state information is forbidden or not, and when the centralized forbidding bit is valid, the state information corresponding to the centralized forbidding bit can be set only from the centralized controller side;

when a centralized prohibition position is set and is effective by a main centralized controller, only the main centralized controller can issue an air conditioner control instruction to the air conditioning unit;

when the slave centralized controllers set the centralized prohibition bits and are effective, whether an air-conditioning control instruction is forwarded to the air-conditioning unit through the master centralized controller is judged based on the priority of each slave centralized controller and the centralized prohibition bits, so that the air-conditioning control instruction controls the air-conditioning state corresponding to the effective centralized prohibition bits.

8. The centralized control system of claim 7,

the master centralized controller carries out broadcast query to each slave centralized controller on the communication bus, and establishes a centralized forbidden bit table corresponding to the queried slave centralized controller, wherein the centralized forbidden bit table stores the communication address, the priority and the centralized forbidden bit of the slave centralized controller.

9. The centralized control system of claim 8,

judging whether an air conditioner control instruction is forwarded to the air conditioning unit through the main centralized controller, specifically:

s1: the slave centralized controller issues an air conditioner control instruction corresponding to the centralized forbidden position;

s2: the master centralized controller receives an air conditioner control instruction through the communication bus and replies a response instruction;

s3: the master centralized controller inquires the centralized forbidding bit table, inquires whether a slave centralized controller with the priority higher than that of the slave centralized controller is provided with a centralized forbidding bit which is the same as the centralized forbidding bit, if so, returns to S2, and if not, proceeds to S4;

s4: and the main centralized controller forwards the air conditioner control command to the air conditioning unit.

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