Indoor air conditioning management system with seat occupancy sensing and control method thereof

Abstract

The present application relates to a kind of indoor air conditioner management system and its control method of seat in position sensing, the method includes: the corresponding RFID reader of each air conditioner in current space is set;Periodically by all RFID readers, electromagnetic wave is transmitted to the area, the in-position signal returned by the corresponding RFID sensing system of each seat in current space is obtained;Control system receives the in-position signal returned by RFID reader and the RSSI value of in-position signal, the air conditioner corresponding to the RFID reader whose mean value of the RSSI value exceeds first threshold is started;The number of the air conditioner corresponding to the adjustment is calculated, and the fresh air delivery capacity of the air conditioner is adjusted according to the change value of the adjustment number.The system includes: a plurality of RFID readers, a plurality of air conditioners, a plurality of seats, control system.In-position sensing is realized by seat to realize indoor air conditioner management.

Description

Technical Field

[0001] This invention relates to the field of air conditioning management, specifically to an indoor air conditioning management system and its control method that uses seat presence sensing. Background Technology

[0002] In places with high personnel flow, such as conference rooms, train stations, and hospitals, air conditioning is installed to regulate fresh air. Air conditioning management systems can control the activation and adjustment of the air conditioning units. However, due to the movement of people, the number and location of people indoors are variable. It's possible that there are empty rooms where the air conditioning is still running in fresh air mode, or that people are concentrated in one area while other areas are empty, resulting in all air conditioning units running in fresh air mode and wasting energy.

[0003] To address the aforementioned issues, existing technologies incorporate pressure or gravity sensors into the seats. When a person sits on the seat, the data from the corresponding sensors changes. Since pressure or gravity sensors are active devices, they require power supplies via power lines and communication lines to acquire their feedback data signals. Therefore, seats with presence sensing capabilities suffer from complex wiring, high costs, and require specific structural designs and modifications to the seat's interior based on the wiring.

[0004] Furthermore, existing sensor seats can only detect whether there are people. The control system corresponding to the sensor seats cannot determine the location of people or areas with high population density. Therefore, the control system blindly adjusts the fresh air of the air conditioner, which can easily lead to waste of resources.

[0005] The purpose of this invention is to design an indoor air conditioning management system and control method with seat presence sensing to address the problems existing in the prior art. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides an indoor air conditioning management system and control method for seat presence sensing, which can effectively solve at least one of the problems existing in the prior art.

[0007] The technical solution of this invention is:

[0008] A control method for an indoor air conditioning management system based on seat presence sensing, wherein the indoor air conditioning management system based on seat presence sensing includes:

[0009] A plurality of RFID readers are disposed in the current space, the current space is divided into a plurality of regions, and an RFID reader is disposed at the center of each region, and the reading range of the RFID reader covers the corresponding region;

[0010] Several air conditioners are installed indoors;

[0011] A plurality of seats, each seat including a seat surface and an RFID sensing system, the RFID sensing system being used for seat presence sensing;

[0012] A control system is connected to the RFID reader and the air conditioner. The control system is used to start the air conditioner corresponding to the RFID reader and adjust the fresh air delivery volume and direction of the air conditioner.

[0013] The control method includes:

[0014] Configure the corresponding RFID reader for each of the air conditioners in the current space;

[0015] By periodically transmitting electromagnetic waves into the area by all RFID readers, the presence signal returned by the RFID sensing system corresponding to each seat in the current space is obtained;

[0016] The control system receives the presence signal and RSSI value of the presence signal returned by the RFID reader, and starts the air conditioner corresponding to the RFID reader whose average RSSI value exceeds a first threshold.

[0017] Calculate the number of people who need to use the air conditioner, and adjust the fresh air delivery volume of the air conditioner based on the change in the number of people who need to use it.

[0018] Furthermore, the RFID reader corresponding to each of the air conditioners in the current space includes:

[0019] The control system assigns a number to the acquisition port of each RFID reader.

[0020] Each RFID reader is assigned a number to the control port of the nearest air conditioner.

[0021] Furthermore, the RFID sensing system includes a base, a first RFID chip and a second RFID chip without an RFID antenna, an RFID antenna, and a push button. The base defines the push button's movement direction as up and down. The surface of the push button is provided with the first RFID chip and the second RFID chip, with the first RFID chip located above the second RFID chip. The push button moves up or down due to changes in the shape or position of the chair surface. The RFID antenna is attached to one side of the base along the push button's movement path. When the push button moves downward, it causes the first RFID chip and the RFID antenna to form a first RFID tag. When the push button moves upward, it causes the second RFID chip and the RFID antenna to form a second RFID tag. The ID information stored in the first RFID chip and the second RFID chip are different.

[0022] Furthermore, the step of periodically transmitting electromagnetic waves into the area through all RFID readers to obtain the presence signal returned by the RFID sensing system corresponding to each seat in the current space includes:

[0023] Acquire the data signal returned by the first RFID tag or the second RFID tag corresponding to each seat in the current space;

[0024] The data signal returned by the first RFID tag is marked as an in-situ signal.

[0025] Furthermore, the control system receives the presence signal and the RSSI value of the presence signal returned by the RFID reader, and activates the air conditioner corresponding to the RFID reader whose average RSSI value exceeds a first threshold, including:

[0026] Calculate the mean RSSI value of the in-situ signal for each of the RFID readers;

[0027] If the average RSSI value of the in-situ signal of the RFID reader exceeds a first threshold, the air conditioner corresponding to the RFID reader is activated.

[0028] Furthermore, the calculation of the number of people required to operate the air conditioner includes:

[0029] Calculate the number of in-situ signals acquired by each of the RFID readers;

[0030] Calculate the number of presence signals of all the RFID readers corresponding to the air conditioner, and generate the number of people to be adjusted for the air conditioner.

[0031] Furthermore, adjusting the fresh air delivery volume of the air conditioner based on the change in the number of people being adjusted includes:

[0032] Calculate the difference between the current number of people adjusted and the previous number of people adjusted to obtain the change in the number of people adjusted, Δn.

[0033] The total fresh air delivery volume ΔQ required is calculated by using the change value Δn of the number of people to be adjusted and the fresh air volume per person q, that is, ΔQ=Δnq;

[0034] The change in the operating frequency of the air conditioner, Hb, is calculated by using the total fresh air delivery volume ΔQ, the rated operating frequency He, and the rated air volume Qe. That is, Hb = ΔQ * He / Qe.

[0035] Furthermore, after calculating the number of people to be adjusted for the air conditioner and adjusting the fresh air delivery volume of the air conditioner according to the change in the number of people to be adjusted, the following steps are performed: adjusting the operating direction of the air conditioner according to the personnel density.

[0036] Furthermore, adjusting the operating direction of the air conditioner according to the personnel density includes:

[0037] Establish a horizontal two-dimensional coordinate system based on their spatial location, and mark the two-dimensional coordinates of each RFID reader and air conditioner;

[0038] Calculate the number of people in each direction of the air conditioner's operation. If the number of people in a direction of operation is lower than a second threshold, then turn off that direction of operation.

[0039] Furthermore, the calculation of the number of people in each direction of air conditioning operation includes:

[0040] Calculate the relative distance between each seat with the said presence signal and the RFID reader;

[0041] A triangle is constructed by selecting the two-dimensional coordinates of the three RFID readers corresponding to the seat with the presence signal;

[0042] The two-dimensional coordinates of the seat are calculated using the triangle centroid formula, and the distribution of people in each direction of the air conditioner is plotted using the two-dimensional coordinates of the seat and the two-dimensional coordinates of the air conditioner.

[0043] The number of people in each operating direction of the air conditioner is calculated using the aforementioned population distribution map.

[0044] Therefore, the present invention provides the following effects and / or advantages:

[0045] First, by using the RSSI value of the presence signal on each seat, the nearest RFID reader for each seat can be quickly determined. Then, by identifying the air conditioner corresponding to the RFID reader, the corresponding air conditioner can be quickly identified. By using the average RSSI value received by each RFID reader, it can be determined whether the corresponding air conditioner should be turned on. This ensures that the air conditioner is only activated when there are a sufficient number or density of people in the area corresponding to each air conditioner, thus ensuring energy-saving use of the air conditioner.

[0046] Secondly, by calculating the number of in-situ signals, the number of people corresponding to each air conditioner can be determined. In this way, when adjusting the fresh air, the adjustment amount and the number of people are matched, so that the fresh air adjustment is smooth and will not make people feel abrupt. At the same time, the fresh air delivery volume is adjusted according to the changes in the number of people, which further saves energy.

[0047] Third, by using the RSSI value of each in-situ signal and the coordinate value of its corresponding RFID reader, the two-dimensional coordinate value of each in-situ signal can be determined. Based on the known two-dimensional coordinates of the air conditioner, the number of different in-situ signals in different fresh air directions of the air conditioner can be determined. Then, based on the number of in-situ signals in different fresh air directions, it can be determined whether to shut down the fresh air supply in that direction, thereby realizing the adjustment of fresh air supply in various directions and further achieving energy saving.

[0048] It should be understood that the above summary and the following detailed description of the invention are exemplary and explanatory, and are intended to provide further explanation of the invention as claimed. Attached Figure Description

[0049] Figure 1 This is a schematic diagram showing the distribution of the area, RFID reader, and air conditioner in Embodiment 1 of the present invention.

[0050] Figure 2 This is a schematic diagram of the seat structure according to Embodiment 1 of the present invention.

[0051] Figure 3 This is a partially enlarged schematic diagram of Embodiment 1 of the present invention.

[0052] Figure 4 This is a schematic diagram of the RFID sensing system structure according to Embodiment 1 of the present invention.

[0053] Figure 5 This is a schematic diagram of the seat structure according to Embodiment 2 of the present invention.

[0054] Figure 6 This is a schematic diagram of the RFID sensing system structure according to Embodiment 2 of the present invention.

[0055] Figure 7 A schematic diagram illustrating the control method provided by the present invention.

[0056] Figure 8 This is a schematic diagram illustrating the control of air conditioner startup provided by the present invention.

[0057] Figure 9 This is a schematic diagram illustrating the control of the air conditioner's operating direction provided by the present invention. Detailed Implementation

[0058] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings:

[0059] refer to Figure 1 An indoor air conditioning management system with seat presence sensing, characterized in that it includes:

[0060] A plurality of RFID readers 4 are disposed in the current space 100, the current space 100 is divided into a plurality of regions 110, and an RFID reader 4 is disposed at the center of each region 110, and the reading range of the RFID reader 4 covers the corresponding region.

[0061] In this embodiment, the current space 100 can be a large conference room, a train station, etc., with a large area and multiple air conditioners installed for cooling and fresh air conditioning. It can also be an ordinary indoor room, etc. No specific limitation is made here. This embodiment uses a conference room as an example. The conference room is divided into several areas 1-12 of the same area, and areas 1-12 constitute the complete area of ​​the conference room. At the same time, areas 1-12 do not overlap with each other.

[0062] In this embodiment, the RFID reader 4 is a prior art technology, and its coverage range can be about 3-5 meters. Therefore, the area 110 is also about 3-5 meters in length and width. At this time, the scanning range of the RFID reader 4 can cover the area 110, and the scanning range of the RFID reader 4 in the current area 110 can be non-overlapping with the scanning range of the adjacent area 110.

[0063] Several air conditioners are installed indoors to regulate the amount and direction of fresh air in the space.

[0064] Several seats, for reference Figure 2The seat includes a seat surface 2, seat legs 1, and an RFID sensing system 3. The RFID sensing system 3 includes a base 301, a first RFID chip 303 and a second RFID chip 304 (not connected to an RFID antenna 302), an RFID antenna 302, and a press button 305. The base 301 limits the movement of the press button 305 to up and down. The surface of the press button 305 is provided with the first RFID chip 303 and the second RFID chip 304, with the first RFID chip 303 located above the second RFID chip 304. The press button 305 is controlled by the seat surface 2. The shape or position change causes it to move upward or downward. The base 301 has the RFID antenna 302 attached to one side of the moving path of the press button 305. When the press button 305 moves downward, it drives the first RFID chip 303 and the RFID antenna 302 to form a first RFID tag. When the press button 305 moves upward, it drives the second RFID chip 304 and the RFID antenna 302 to form a second RFID tag. The ID information stored in the first RFID chip 303 and the second RFID chip 304 are different.

[0065] The control system is connected to the RFID reader 4 and the air conditioner. The control system is used to start the air conditioner corresponding to the RFID reader 4 and adjust the fresh air delivery volume and direction of the air conditioner.

[0066] In this embodiment, the RFID chip refers to the part of the RFID tag excluding the RFID antenna; it can also be called an RFID chip, which stores certain data. The structure and working principle of the RFID chip and RFID antenna are existing technologies. The principle is that the RFID antenna couples to a carrier wave emitted by an external reader, thereby providing power to the RFID chip. Driven by this power, the RFID chip emits the data stored within it. This data is transmitted through the RFID antenna and read by the external reader, thus obtaining the data stored in the RFID chip. In other words, if the RFID chip's radio frequency terminal is not electrically connected to the RFID antenna, the RFID chip cannot obtain external power and therefore cannot function.

[0067] In this embodiment, the RFID reader 4 can be installed on the wall, floor, or ceiling. It reads the data of the RFID tag on the seat through wireless scanning. This eliminates the need to install weight or pressure sensors on the seat, as well as batteries or power cords inside the seat to power the weight or pressure sensors, and communication lines inside the seat to transmit the data from the weight or pressure sensors. This simplifies the structure of the seat and minimizes the number of components.

[0068] In this embodiment, one RFID antenna 302 and two RFID chips are used. Only one RFID chip can be connected to the RFID antenna 302 to form an RFID tag at a time. That is, when the press button is moved upward, only the second RFID chip 304 and the RFID antenna 302 can form an RFID tag that can work in coordination with the carrier wave of the RFID reader 4. At this time, the first RFID chip 303 cannot work, and the RFID reader 4 can read the information stored in the second RFID chip 304. When the press button 305 is moved downward, only the first RFID chip 303 and the RFID antenna 302 can form an RFID tag that can work in coordination with the carrier wave of the RFID reader 4. At this time, the second RFID chip 304 cannot work, and the RFID reader 4 can read the information stored in the first RFID chip 303.

[0069] Furthermore, the ID information stored in the first RFID chip 303 and the second RFID chip 304 is different. For example, the ID information stored in the first RFID chip 303 is 001, and the ID information stored in the second RFID chip 304 is 002. When the RFID reader 4 reads the 001 information, it determines that the information was sent by the first RFID chip 303. At this time, the first RFID chip 303 and the RFID antenna 302 form an RFID tag, and it can be determined that the first RFID chip 303 is in a downward position, which is caused by a person sitting on the seat 2. Therefore, it can be determined that there is someone in the seat. Conversely, when the RFID reader 4 reads the 002 information, it determines that the information was sent by the second RFID chip 304. At this time, the second RFID chip 304 and the RFID antenna 302 form an RFID tag, and it can be determined that the second RFID chip 304 is in an upward position, which is caused by no person sitting on the seat 2. Therefore, it can be determined that there is no one in the seat.

[0070] Furthermore, it includes a buffer mechanism 5, which is connected between the chair leg 1 and the chair surface 2. The RFID sensing system 3 is located below the chair surface 2. When a person sits on the chair surface 2, the chair surface 2 sinks and drives the pressing button 305 to move downward. When the person leaves the chair surface 2, the chair surface 2 floats up and drives the pressing button 305 to move upward.

[0071] Furthermore, the buffer mechanism 5 includes a hydraulic damper, the cylinder of which is fixedly connected to the chair leg 1, the piston of which is supported at the bottom of the chair surface 2, the base 301 is disposed on the cylinder of the hydraulic damper, and the top end of the push button 305 is fixedly connected to the piston of the hydraulic damper.

[0072] In this embodiment, the hydraulic damper is existing technology. A hydraulic damper is a system that uses the damping properties of a liquid to control mechanical movement. It provides a certain buffering effect when a person sits on the seat 2, allowing the seat to slowly sink a certain distance due to the person's weight, and slowly rises back to its original height when the person leaves the seat 2. This gives the seat 2 a certain amount of floating space, making the chair more comfortable. This embodiment utilizes the characteristic of the hydraulic damper to raise or lower the seat 2 by a certain height, and incorporates an RFID sensing system 3. For example... Figure 3 As shown, the cylinder of the hydraulic damper is fixedly connected to the chair leg 1, and the top of the pressing key 305 is fixedly connected to the piston of the hydraulic damper. Therefore, when the piston of the hydraulic damper moves, it can drive the pressing key 305 to move up and down, thereby enabling different RFID chips to be connected to the RFID antenna 302.

[0073] Furthermore, the device includes a bearing 6, the inner ring of which is fixedly connected to the cylinder of the hydraulic damper, and a base 301 fixedly connected to the outer ring of the bearing 6. A plurality of guide posts 306 are connected between the base 301 and the top end of the push button 305. The guide posts 306 limit the top end of the push button 305 to rotate with the base 301 and limit the direction of movement of the push button 305 to up and down.

[0074] Since the seat can rotate, to avoid the RFID sensing system 3 restricting the seat's rotation, this embodiment uses the bearing 6 to allow the base 301 to be fixedly mounted on the outer ring of the bearing 6, allowing it to rotate freely. Simultaneously, when the seat 2 rotates, pressing the button 305 will cause the base 301 to rotate as well, while the chair legs 1 will not rotate, thus achieving the function of free rotation of the seat 2.

[0075] Furthermore, the lower end of the press button 305 is housed within the base 301, such that the side of the press button 305 protrudes from the outside of the base 301, and the first RFID chip 303 and the second RFID chip 304 are disposed at the position where the side of the press button 305 protrudes from the base 301.

[0076] Furthermore, it includes two sets of connectors 307 and two sets of brushes 308. The connectors 307 are respectively connected to the radio frequency ports of the first RFID chip 303 or the second RFID chip 304. The brushes 308 are disposed at the ends of the connectors 307 and face the ends of the RFID antenna 302. After the press button 305 moves down or up, the brushes 308 electrically connect the corresponding first RFID chip 303 or second RFID chip 304 to the RFID antenna 302.

[0077] refer to Figure 4 In this embodiment, the base 301 accommodates a portion of the lower side of the press button 305, thereby exposing the other portion of the lower side of the press button 305 beyond the base 301. The first RFID chip 303 or the second RFID chip 304 is disposed on the exposed portion of the press button 305, so that the first RFID chip 303 or the second RFID chip 304 can be on the same straight line and on the same plane, and are not easily blocked by the base 301 during the up-and-down movement of the press button 305. The radio frequency terminal of the chip can be led out through the connector 307. The connector 307 is an electrically connectable structure, such as a metal part. The connector 307 fixes the brush 308 toward the end of the RFID antenna 302. When the corresponding RFID chip moves to a position opposite to the RFID antenna 302, the brush 308 can contact the end of the RFID antenna 302, thereby electrically connecting the connector 307, the RFID chip, and the RFID antenna 302 to form a corresponding RFID tag. The brush 308 is a long strip in the longitudinal direction, which can widen the end of the connector 307. This is because when people of different weights sit on the seat 2, the descent space of the buffer mechanism is also different. Through the widening effect of the brush 308, the descent of the buffer mechanism for people of different weights can be connected to the corresponding RFID chip and RFID antenna.

[0078] In this embodiment, the RFID sensing system 3 is driven by the up-and-down movement of the chair surface 2.

[0079] This embodiment obtains different ID information and identifies whether the information is stored in the first or second RFID chip. This allows it to determine the current location of the RFID antenna corresponding to either the first or second RFID chip. It then determines whether the chair surface has been squeezed, deformed, or sunken, triggering the corresponding RFID chip and RFID antenna to form an RFID tag that works with an RFID reader. This allows it to know whether a seat is occupied and to activate the air conditioning in the appropriate area based on occupancy, achieving energy savings. Simultaneously, when no one is sitting on the chair, the second RFID chip remains connected to the RFID antenna and can be scanned within the readable range by an RFID reader. By recording the information stored in the second RFID chips corresponding to multiple seats, a quick inventory of seats can be performed, enabling convenient seat management and asset inventory.

[0080] Example 2

[0081] This embodiment is basically the same as Embodiment 1, except that the RFID sensing system 3 is set in a different location.

[0082] like Figure 5 As shown, the seat surface 2 is a soft seat surface, and the seat surface 2 is filled with a filling material to make the seat surface 2 expand. The RFID sensing system 3 is set at the bottom of the seat surface 2. When a person sits on the seat surface 2, the seat surface 2 is squeezed and deformed, which drives the pressing button 305 to move downward. When the person leaves the seat surface 2, the seat surface 2 naturally returns to its original state, which drives the pressing button 305 to move upward.

[0083] Furthermore, the RFID sensing system 3 includes an elastic element 309, which is connected between the press button 305 and the base 301, and the elastic element 309 causes the press button 305 to have an upward tendency.

[0084] In this embodiment, the RFID sensing system 3 is as follows: Figure 6 As shown, it does not include a guide post, but includes an elastic element 309, which may be a spring.

[0085] Furthermore, in this embodiment, the RFID sensing system 3 is not located on the outside of the seat surface 2, but rather inside the seat surface 2, which is inflated by a filling material, such as sponge. In its natural state, the expansion of the filling material keeps the seat surface 2 inflated, preventing the button 305 from being pressed, thus placing the second RFID chip 304 in a position connected to the RFID antenna 302. When a person sits on the seat surface 2, it is compressed and concave, causing the button 305 to move downwards. The elastic element 309 gives the button 305 an upward tendency, so that when the person is not sitting on the seat surface 2, the elastic element 309 can cause the button 305 to move upwards, achieving rapid recovery.

[0086] In Embodiments 1 and 2, the control system can be a server, etc., and the seats can be movable, such as wheeled chairs, which can be moved randomly by the user. In this case, the distribution of the seats in the current space 100 is random. The seats can also be fixedly distributed, such as the seats in a movie theater, which are arranged in several rows. When a person sits on a seat, the first RFID chip 303 and the RFID antenna 302 form a first RFID tag. At this time, the RFID reader 4 can work in conjunction with the first RFID tag and read the ID information returned by the first RFID tag. The control system determines whether there is a person in area 110 by whether the RFID reader 4 has read the ID information returned by the first RFID tag, and then starts the air conditioner in that area. For example, if there is a seat in area 110 and the signal returned by the seat belongs to the ID information returned by the first RFID tag, the control system starts the air conditioner in area 2, and the air conditioners in other areas 2 are turned off. Therefore, the indoor lighting management system provided in Embodiments 1 or 2 can easily and quickly obtain the information of people in the seats. Only when there is a seat in the area and people are sitting on the seat will the air conditioner in that area be automatically started, achieving the effect of energy saving. Furthermore, the indoor lighting management system provided in Embodiment 1 or 2 uses RFID technology, which is a passive technology. It does not require the connection and deployment of power supply, communication lines, etc. for RFID chips or antennas. Only one RFID reader is needed to read all RFID tags in the area. Moreover, RFID chips and RFID antennas are inexpensive, which reduces the cost of the lighting management system.

[0087] A control method for an indoor air conditioning management system with seat presence sensing is further provided. Based on the indoor air conditioning management system with seat presence sensing described in Embodiment 1 or 2, the method includes the following steps:

[0088] S1 sets the corresponding RFID reader for each of the air conditioners in the current space;

[0089] S101 assigns a number to the acquisition port of each RFID reader through the control system;

[0090] S102 binds the number of each RFID reader to the control port of the nearest air conditioner.

[0091] In this step, since the data signal returned by the first RFID tag only contains the ID information stored in the RFID chip of the first RFID tag, it is not possible to directly determine which RFID reader received the data signal from the first RFID tag. During the installation and deployment of RFID readers, the acquisition ports of each RFID reader can be directly numbered through the control system. For example, the RFID reader port number in area 1 is 01, the RFID reader port number in area 2 is 02, and so on. The nearest air conditioner for each RFID reader can be manually assigned. Thus, a matching relationship between RFID readers and air conditioners can be established based on their numbers and their corresponding areas.

[0092] S2 periodically transmits electromagnetic waves to the area through all RFID readers, and obtains the presence signal returned by the RFID sensing system corresponding to each seat in the current space;

[0093] S201 Obtain the data signal returned by the first RFID tag or the second RFID tag corresponding to each seat in the current space;

[0094] S202 marks the data signal returned by the first RFID tag as an in-situ signal.

[0095] In this step, the RFID reader periodically emitting electromagnetic waves into the area and receiving data signals returned by the RFID tags is existing technology. The core of this step lies in the fact that the chips corresponding to the RFID tags differ depending on whether a person is sitting in the seat or not, thus resulting in different ranges of data signals. This embodiment can pre-store all the information that the first RFID tags can return in the control system, establishing a data table.

[0096] For example Figure 7 As shown, seats are present in areas 1, 2, and 3, while no seats are present in the other areas, and only the seats in area 2 are occupied. At this time, the RFID readers in areas 1 and 3 read the information returned by the second RFID tag, while the RFID reader in area 2 reads the information returned by the first RFID tag.

[0097] In this step, only the first RFID tag indicates the presence of personnel. When the ID information returned by the RFID tag is obtained, the data table mentioned above is checked to see if there is a corresponding ID information. If so, it can be determined that the ID information was returned by the first RFID tag.

[0098] Then, determine which RFID reader received the information returned by the corresponding first RFID tag. For example, if the RFID reader with the number 002 received it, then find the air conditioner corresponding to the RFID reader with the number 002 through the correspondence.

[0099] The S3 control system receives the presence signal and RSSI value of the presence signal returned by the RFID reader, and starts the air conditioner corresponding to the RFID reader whose average RSSI value exceeds a first threshold.

[0100] S301 calculates the mean RSSI value of the in-situ signal of each of the RFID readers;

[0101] S302 If the average value of the RSSI value of the in-situ signal of the RFID reader exceeds the first threshold, then the air conditioner corresponding to the RFID reader is activated.

[0102] In this step, because the seats may move, or even if the seats are fixed, the position where a person sits is random, the RSSI value of the received presence signal will be different for each RFID reader due to spatial distance; for example... Figure 8 As shown, if a person is sitting on a movable seat at the junction of Zone 6 and Zone 7, the RFID readers in both Zone 6 and Zone 7 may receive a presence signal. Since the presence signal is closer to the RFID reader in Zone 6, the average RSSI value of the presence signal received by the RFID reader is larger. Therefore, it is necessary to turn on the air conditioner 1 corresponding to the RFID reader in Zone 6, but not the air conditioner 2 corresponding to the RFID reader in Zone 7, thus achieving energy saving.

[0103] Furthermore, in this invention, the first threshold can be ±1 dBm of the RSSI value of an in-situ signal directly below the RFID reader.

[0104] S4 calculates the number of people to be regulated by the air conditioner and adjusts the fresh air delivery volume of the air conditioner according to the change in the number of people to be regulated.

[0105] S4011 calculates the number of in-situ signals acquired by each of the RFID readers;

[0106] S4012 calculates the number of presence signals of all the RFID readers corresponding to the air conditioner, and generates the number of people to be adjusted for the air conditioner.

[0107] S4013 calculates the difference between the current number of people adjusted and the previous number of people adjusted, and obtains the change value Δn of the number of people adjusted;

[0108] S4014 calculates the required total fresh air delivery volume ΔQ using the change value Δn of the number of people to be adjusted and the fresh air volume per person q, that is, ΔQ=Δnq;

[0109] S4015 calculates the change value Hb of the air conditioner's operating frequency using the total fresh air delivery volume ΔQ, the air conditioner's rated operating frequency He, and the rated air volume Qe, i.e., Hb = ΔQ * He / Qe.

[0110] In this step, the standard requirement is to increase the fresh air supply by 30 cubic meters q (which can be set) for each additional person; that is, the average fresh air supply q per person is 30m³. 3 Therefore, the change in fresh air volume ΔQ can be calculated by considering the changing number of people, which represents the required adjustment of the fresh air supply ΔQ. The fresh air supply ΔQ is directly proportional to the air conditioner's operating frequency, He (typically 50Hz) and Qe. The formula is: Hb = ΔQ * He / Qe. This allows for a smooth adjustment of the fresh air supply based on the number of people using the system, preventing abrupt changes and further saving energy.

[0111] S5 adjusts the operating direction of the air conditioner according to the density of people.

[0112] S501 establishes a horizontal two-dimensional coordinate system based on the spatial location and calibrates the two-dimensional coordinates of each RFID reader and air conditioner;

[0113] S502 calculates the number of people in each operating direction of the air conditioner. If the number of people in the operating direction is lower than the second threshold, then the operating direction is turned off.

[0114] The calculation of the number of people in each direction of air conditioning operation includes:

[0115] S5021 calculates the relative distance between each of the seats with the said presence signal and the RFID reader;

[0116] In this step, RFID signal attenuation occurs during propagation, and the attenuation increases with distance. The RSSI-based ranging algorithm has a certain functional relationship P with the distance. This functional relationship P can be used to measure the relative distance between the on-site signal and the RFID reader. The expression for this functional relationship P is as follows:

[0117]

[0118] In this function, d represents the relative distance between the in-situ signal and the RFID reader; P(d0) represents the RSSI value when d = 1m; n represents the path loss ratio coefficient, indicating the degree of signal loss as distance increases, which is related to the positioning environment; ε represents a Gaussian distributed random variable with a mean of zero. Before deploying the equipment, the values ​​of ε and n need to be measured and fitted according to the actual environment.

[0119] S5022 Selects the two-dimensional coordinates of the three corresponding RFID readers of the seat with the in-situ signal to construct a triangle;

[0120] S5023 calculates the two-dimensional coordinates of the seat according to the triangle centroid formula, and draws a distribution map of the number of people in each operating direction of the air conditioner using the two-dimensional coordinates of the seat and the two-dimensional coordinates of the air conditioner;

[0121] S5024 calculates the number of people in each operating direction of the air conditioner using the aforementioned personnel distribution map.

[0122] In this step, existing large public places generally use central air conditioning. The central air conditioning can operate and ventilate from all sides. If there are few people or no people on one or two sides of the central air conditioning, the ventilator on that side can be turned off to achieve energy saving.

[0123] like Figure 9 As shown, the location of the in-situ signal can be achieved using the RSSI value of the in-situ signal. The two-dimensional coordinates (x1, y1), (x2, y2), and (x3, y3) of the three corresponding RFID readers around the in-situ signal are known. According to the formula for the centroid of a triangle: d1 2 =(x1-x) 2 +(y1-y) 2 d2 2 =(x²-x) 2 +(y2-y) 2 d3 2 =(x³-x) 2 +(y3-y) 2 ; Calculate the two-dimensional coordinates (x, y) of the presence signal. Once the two-dimensional coordinates of the presence signal are confirmed, the presence signal can be located around the central air conditioner. In this invention, the second threshold can be set to 2 people. When there is only 1 person in the running direction of one side of the central air conditioner, the air outlet of that side of the central air conditioner can be turned off to achieve energy saving.

[0124] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0125] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0126] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A control method for an indoor air conditioning management system with seat presence sensing, characterized in that, An indoor air conditioning management system based on seat presence sensing, comprising: A plurality of RFID readers are disposed in the current space, the current space is divided into a plurality of regions, and an RFID reader is disposed at the center of each region, and the reading range of the RFID reader covers the corresponding region; Several air conditioners are installed indoors; A plurality of seats, each seat including a seat surface and an RFID sensing system, the RFID sensing system being used for seat presence sensing; A control system is connected to the RFID reader and the air conditioner. The control system is used to start the air conditioner corresponding to the RFID reader and adjust the fresh air delivery volume and direction of the air conditioner. The RFID sensing system includes a base, a first RFID chip and a second RFID chip without an RFID antenna, an RFID antenna, and a push button. The base defines the push button's movement direction as up and down. The push button's surface is provided with the first RFID chip and the second RFID chip, with the first RFID chip located above the second RFID chip. The push button moves up or down due to changes in the shape or position of the chair surface. The RFID antenna is attached to one side of the push button's movement path on the base. When the push button moves downward, it causes the first RFID chip and the RFID antenna to form a first RFID tag. When the push button moves upward, it causes the second RFID chip and the RFID antenna to form a second RFID tag. The first RFID chip and the second RFID chip store different ID information. The control method includes: Configure the corresponding RFID reader for each of the air conditioners in the current space; By periodically transmitting electromagnetic waves into the area by all RFID readers, the presence signal returned by the RFID sensing system corresponding to each seat in the current space is obtained; The control system receives the presence signal and RSSI value of the presence signal returned by the RFID reader, and activates the air conditioner corresponding to the RFID reader whose average RSSI value exceeds a first threshold. Specifically: Calculate the mean RSSI value of the in-situ signal for each of the RFID readers; If the average RSSI value of the in-situ signal of the RFID reader exceeds a first threshold, then the air conditioner corresponding to the RFID reader is activated. Calculate the number of people who need to use the air conditioner, and adjust the fresh air delivery volume of the air conditioner according to the change in the number of people who need to use the air conditioner. The direction of operation of the air conditioner is adjusted according to the density of people, specifically: Establish a horizontal two-dimensional coordinate system based on their spatial location, and mark the two-dimensional coordinates of each RFID reader and air conditioner; Calculate the number of people in each direction the air conditioner operates. If the number of people in that direction is lower than a second threshold, then turn off that direction of operation. Specifically: Calculate the relative distance between each seat with the said presence signal and the RFID reader; A triangle is constructed by selecting the two-dimensional coordinates of the three RFID readers corresponding to the seat with the presence signal; The two-dimensional coordinates of the seat are calculated using the triangle centroid formula, and the distribution of people in each direction of the air conditioner is plotted using the two-dimensional coordinates of the seat and the two-dimensional coordinates of the air conditioner. The number of people in each operating direction of the air conditioner is calculated using the aforementioned population distribution map.

2. The control method for the indoor air conditioning management system with seat presence sensing according to claim 1, characterized in that: The setting of the corresponding RFID reader for each of the air conditioners in the current space includes: The control system assigns a number to the acquisition port of each RFID reader. Each RFID reader is assigned a number to the control port of the nearest air conditioner.

3. The control method for the indoor air conditioning management system with seat presence sensing according to claim 1, characterized in that: The process of periodically transmitting electromagnetic waves into the area through all RFID readers to obtain the presence signal returned by the RFID sensing system corresponding to each seat in the current space includes: Acquire the data signal returned by the first RFID tag or the second RFID tag corresponding to each seat in the current space; The data signal returned by the first RFID tag is marked as an in-situ signal.

4. The control method for the indoor air conditioning management system with seat presence sensing according to claim 1, characterized in that: The calculation of the number of people required to operate the air conditioner includes: Calculate the number of in-situ signals acquired by each of the RFID readers; Calculate the number of presence signals of all the RFID readers corresponding to the air conditioner, and generate the number of people to be adjusted for the air conditioner.

5. The control method for the indoor air conditioning management system with seat presence sensing according to claim 1, characterized in that: The step of adjusting the fresh air delivery volume of the air conditioner according to the change in the number of people being adjusted includes: Calculate the difference between the current number of people adjusted and the previous number of people adjusted to obtain the change in the number of people adjusted, Δn. The total fresh air delivery volume ΔQ required is calculated by using the change value Δn of the number of people to be adjusted and the fresh air volume per person q, that is, ΔQ=Δnq; The change in the operating frequency of the air conditioner, Hb, is calculated by using the total fresh air delivery volume ΔQ, the rated operating frequency He, and the rated air volume Qe. That is, Hb = ΔQ * He / Qe.

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