CN113932398B - Air conditioner and carbon dioxide concentration detection method - Google Patents
Air conditioner and carbon dioxide concentration detection method Download PDFInfo
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- CN113932398B CN113932398B CN202010670582.XA CN202010670582A CN113932398B CN 113932398 B CN113932398 B CN 113932398B CN 202010670582 A CN202010670582 A CN 202010670582A CN 113932398 B CN113932398 B CN 113932398B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/70—Carbon dioxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention provides an air conditioner and a carbon dioxide concentration detection method, wherein the method is applied to the air conditioner comprising a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor fan, a fresh air fan, a carbon dioxide concentration sensor and a controller, and the controller is configured to receive a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval; determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence; the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence, so that the indoor carbon dioxide concentration is accurately measured, and the carbon dioxide concentration of indoor air is timely prompted to a user.
Description
Technical Field
The present application relates to the field of air conditioner control technologies, and in particular, to an air conditioner and a carbon dioxide concentration detection method.
Background
Carbon dioxide is colorless, odorless or colorless odorless and slightly sour gas at normal temperature and normal pressure, is also a common greenhouse gas, and is also one of the components of air. When the concentration of carbon dioxide in the air is lower than 2%, the carbon dioxide is not obviously harmful to people, and when the concentration exceeds the concentration, the human respiratory organs can be damaged, namely, under the general condition, the carbon dioxide is not a toxic substance, but when the concentration of the carbon dioxide in the air exceeds a certain limit, the poisoning phenomenon of the human body can be generated, and the people can be choked by the high-concentration carbon dioxide. Animal experiments prove that: in normoxic (20%) air, the higher the concentration of carbon dioxide, the higher the mortality of the animals. At the same time, pure carbon dioxide causes more rapid death due to lower oxygen in animal death. In addition, under the condition of low oxygen, the carbon dioxide with the concentration of 8-10% can cause death of people and animals in a short time.
However, in the prior art, when the indoor fan starts to send air after the air conditioner is started, the indoor carbon dioxide concentration is increased and then reduced due to air circulation, and the fluctuation time length is different based on the indoor room area and the fresh air rotating speed. There is a need for a method of identifying the length of time to alert the user to the value of carbon dioxide concentration during that period of time.
Therefore, how to provide an air conditioner capable of accurately prompting the indoor carbon dioxide concentration of a user is a technical problem to be solved at present.
Disclosure of Invention
Because in the prior art, when an indoor fan starts to send air, the indoor carbon dioxide concentration can be increased and then reduced due to air circulation, so that the air conditioner cannot accurately identify the indoor carbon dioxide concentration value, in order to solve the technical problem, the invention provides the air conditioner, which comprises the following components:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an indoor heat exchanger operating as a condenser or an evaporator;
an indoor fan for introducing air flow through the suction inlet and sending out through the air outlet after passing through the indoor heat exchanger;
the fresh air fan is used for providing outdoor fresh air for the indoor;
a carbon dioxide concentration sensor for detecting the concentration of carbon dioxide in the room;
the controller is configured to receive a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval;
determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence;
the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence.
In some embodiments, the controller is specifically configured to:
determining the normal sampling time of the carbon dioxide concentration according to the change phase;
and determining the normal carbon dioxide concentration according to the sampling value of the carbon dioxide concentration after the normal sampling time.
In some embodiments, the controller is further specifically configured to:
if the carbon dioxide concentration in the sampling sequence sequentially passes through the first stage, the second stage, the third stage and the fourth stage, determining the normal sampling time according to the ending time of the fourth stage;
the first stage comprises a first sampling value and a second sampling value which are adjacent, and the difference value between the second sampling value and the first sampling value is not smaller than a first preset difference value; the second stage comprises a third sampling value, a fourth sampling value and a fifth sampling value which are adjacent, wherein the third sampling value is not greater than the fourth sampling value and the fourth sampling value is not greater than the fifth sampling value; the third stage comprises a sixth sampling value and a seventh sampling value which are adjacent, and the difference value between the sixth sampling value and the seventh sampling value is not smaller than the first preset difference value; the fourth stage comprises an eighth sampling value and a ninth sampling value which are adjacent, and the difference value between the eighth sampling value and the ninth sampling value is not larger than a second preset difference value.
In some embodiments, the controller is further specifically configured to:
before the normal sampling time, displaying first prompt information which does not comprise the normal carbon dioxide concentration to a user;
and after the normal sampling time, displaying second prompt information comprising the normal carbon dioxide concentration to the user.
Correspondingly, the invention also provides a carbon dioxide concentration detection method which is applied to an air conditioner comprising a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor fan, a fresh air fan, a carbon dioxide concentration sensor and a controller, and comprises the following steps:
according to a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started at a preset sampling interval;
determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence;
the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence.
In some embodiments, the normal carbon dioxide concentration of the indoor space is determined according to the change phase of the carbon dioxide concentration in the sampling sequence, specifically:
determining the normal sampling time of the carbon dioxide concentration according to the change phase;
and determining the normal carbon dioxide concentration according to the sampling value of the carbon dioxide concentration after the normal sampling time.
In some embodiments, the change phase includes a first phase, a second phase, a third phase, and a fourth phase, and the determining the normal sampling time of the carbon dioxide concentration according to the change phase specifically includes:
if the carbon dioxide concentration in the sampling sequence sequentially passes through the first stage, the second stage, the third stage and the fourth stage, determining the normal sampling time according to the ending time of the fourth stage;
the first stage comprises a first sampling value and a second sampling value which are adjacent, and the difference value between the second sampling value and the first sampling value is not smaller than a first preset difference value; the second stage comprises a third sampling value, a fourth sampling value and a fifth sampling value which are adjacent, wherein the third sampling value is not greater than the fourth sampling value and the fourth sampling value is not greater than the fifth sampling value; the third stage comprises a sixth sampling value and a seventh sampling value which are adjacent, and the difference value between the sixth sampling value and the seventh sampling value is not smaller than the first preset difference value; the fourth stage comprises an eighth sampling value and a ninth sampling value which are adjacent, and the difference value between the eighth sampling value and the ninth sampling value is not larger than a second preset difference value.
In some embodiments, the method further comprises:
before the normal sampling time, displaying first prompt information which does not comprise the normal carbon dioxide concentration to a user;
and after the normal sampling time, displaying second prompt information comprising the normal carbon dioxide concentration to the user.
By applying the above technical scheme, the controller of the air conditioner is configured to receive a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval; determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence; the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence, so that the indoor carbon dioxide concentration is accurately measured, and the carbon dioxide concentration of indoor air is timely prompted to a user.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view showing an external appearance of an air conditioner of an embodiment;
fig. 2 is a circuit diagram showing an outline of the structure of the air conditioner of the embodiment;
fig. 3 is a block diagram showing an outline of a structure of a control system of an air conditioner;
fig. 4 is a schematic view illustrating a structure of an air conditioner according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart showing a method for detecting carbon dioxide concentration according to an embodiment of the present invention;
fig. 6 is a schematic diagram showing a relationship between carbon dioxide concentration and sampling time interval proposed by an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The air conditioner in this application performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state 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 may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is, for example, an indoor unit (shown in the figure), and the indoor unit is usually mounted on an indoor wall surface WL or the like. For another example, an indoor unit (not shown) is also an indoor unit mode.
The outdoor unit 2 is usually installed outdoors and is used for heat exchange in an indoor environment. In fig. 1, the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 across the wall surface WL, and the outdoor unit 2 is indicated by a broken line.
Fig. 2 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of performing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected to each other by a connection pipe 4 to form a refrigerant circuit 10 through which a refrigerant circulates.
As shown in fig. 3, the air conditioner 1 includes a control unit 50 for controlling operations of the respective components in the air conditioner so that the respective components of the air conditioner 1 operate to realize respective predetermined functions of the air conditioner. A remote controller 5 is attached to the air conditioner 1, and the remote controller 5 has a function of communicating with the control unit 50 using, for example, infrared rays or other communication means. The remote controller 5 is used for various controls of the air conditioner by a user, and interaction between the user and the air conditioner is realized.
For further describing the scheme of the present application, fig. 4 shows a schematic structural diagram of an air conditioner based on a fresh air function according to an embodiment of the present application, which specifically includes:
and the refrigerant circulation loop enables the refrigerant to circulate in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer.
In a preferred embodiment of the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
And the compressor is used for compressing the low-temperature low-pressure refrigerant gas into the high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser.
In a preferred embodiment of the present application, the compressor compresses refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The indoor heat exchanger operates as a condenser or an evaporator.
In a preferred embodiment of the present application, the outdoor unit of the air conditioner includes a portion of the refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and the expansion valve may be provided in the indoor unit or the outdoor unit.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state 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 may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
An indoor fan 101 for introducing an air flow through the suction port and sending the air flow out through the air outlet after passing through the indoor heat exchanger.
A carbon dioxide concentration sensor 103 for detecting the concentration of carbon dioxide in the room.
The controller 104 is configured to receive a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval;
determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence;
the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence.
In order to measure the carbon dioxide concentration more accurately, in the preferred embodiment of the application, the research shows that when the fresh air fan starts to send air after the air conditioner is started, the indoor carbon dioxide concentration has a process of rising and then reducing due to air circulation, wherein the time length of the fluctuation can be different according to the size of the indoor room area and the rotating speed of the fresh air fan. The carbon dioxide sensor in the air conditioner receives and indicates to the user that the carbon dioxide concentration is actually unstable, so that the air conditioner needs a more accurate method for indicating the carbon dioxide concentration to the user, so that the user is informed of only reference when the carbon dioxide concentration is unstable, and the user is informed of the sampled value after the carbon dioxide concentration in the room is transited to the normal state.
Specifically, when the fresh air fan or the air conditioner is just started, because the air in the room can circulate, the concentration sampled by the carbon dioxide sensor is changed from the original non-flowing air to the concentration in the flowing air, wherein the carbon dioxide concentration can be divided into two parts, as shown in fig. 6, the left side of the dividing line is a transition zone, and the right side is a normal change zone. In the transition interval, the fluctuation of the carbon dioxide concentration is larger, the sampling value is not used as the actual room carbon dioxide concentration value, the user can be informed of the time belonging to the air circulation stage through the mobile phone APP or the display screen indicator lamp, and the concentration is not used as the room actual value. When to the right of the dividing line, it is indicated that the room carbon dioxide concentration has entered the normal change zone.
It should be noted that, the scheme of the above preferred embodiment is only a specific implementation scheme provided in the present application, and the user can be informed that the period of time belongs to the air circulation stage through the mobile phone APP, the concentration is not used as the real value of the room, and the user can also be prompted through the display screen indicator lamp, and the different modes of specifically informing the user belong to the protection scope of the present application.
In order to better determine whether the carbon dioxide concentration in the room is stable, in the preferred embodiment of the present application, as shown in fig. 3, the method for determining the normal carbon dioxide concentration in the indoor space according to the change phase of the carbon dioxide concentration in the sampling sequence and prompting the user to divide the carbon dioxide concentration in the room into two parts according to time, specifically identifying the dividing line and then prompting the user is as follows:
condition 1: when the fresh air fan or the air conditioner is started, the carbon dioxide concentration is sampled every 30ms, the difference value of the carbon dioxide concentration at the time t1 and the carbon dioxide concentration at the time t2 is compared, and if C2-C1 is more than or equal to delta C0, the condition 1 is satisfied.
Condition 2: after the condition 1 is satisfied, the carbon dioxide concentration is sampled every 30ms, and the carbon dioxide concentration values at the time t3, the time t4 and the time t5 are compared, so that the condition 2 is satisfied when the C3 is less than or equal to C4 and less than or equal to C5 is satisfied.
Condition 3: after the condition 2 is met, the carbon dioxide concentration is sampled every 30ms, the difference value of the carbon dioxide concentration at the time t6 and the carbon dioxide concentration at the time t7 is compared, and if C6-C7 is more than or equal to delta C0, the condition 3 is met.
Condition 4: after the condition 3 is satisfied, the carbon dioxide concentration is continuously sampled every 30ms, the concentration difference between the next moment and the previous moment is compared, and if Cn-Cn+1 is less than or equal to delta C1, the moment tn+1 is the dividing line.
In the time from the starting time to tn+1, the APP may prompt the user that the carbon dioxide concentration is being calculated by means of a display screen indicating the user that the carbon dioxide concentration is being calculated by means of a flashing indicator light or a ticker light cycle display, or similar, in this interval, the APP may prompt the user that the carbon dioxide concentration is being filtered due to the air cycle being processed, please wait slightly, or the like.
After passing through the dividing line, the APP display and the display screen display are restored to be normal.
It should be noted that, the solution of the above preferred embodiment is only a specific implementation solution provided in the present application, and the preset sampling interval (preferably 30ms in the present embodiment) may be a default value set after the air conditioner leaves the factory, or may be a value that the user considers that the operation is set, where the difference of the preset sampling intervals belongs to the protection scope of the present application.
By applying the technical scheme, the sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started is received according to a preset sampling interval; determining the normal carbon dioxide concentration of the indoor space according to the change stage of the carbon dioxide concentration in the sampling sequence; the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence, so that the indoor carbon dioxide concentration is accurately measured, and the carbon dioxide concentration of indoor air is timely prompted to a user.
Corresponding to an air conditioner based on a fresh air function in the embodiment of the present application, the embodiment of the present application further provides a carbon dioxide concentration detection method, where the method is applied to an air conditioner including a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor fan, a fresh air fan, a carbon dioxide concentration sensor and a controller, as shown in fig. 5, and the method includes:
step 201, receiving a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval.
And step 202, determining the normal carbon dioxide concentration of the indoor space according to the change phase of the carbon dioxide concentration in the sampling sequence.
In order to inform the user that the carbon dioxide concentration in the room is a normal value, in a preferred embodiment of the present application, the normal carbon dioxide concentration in the indoor space is determined according to the change phase of the carbon dioxide concentration in the sampling sequence, specifically:
determining the normal sampling time of the carbon dioxide concentration according to the change phase;
and determining the normal carbon dioxide concentration according to the sampling value of the carbon dioxide concentration after the normal sampling time.
Specifically, the air conditioner judges whether the carbon dioxide concentration in the indoor space is normal according to the change stage of the carbon dioxide concentration in the sampling sequence, and informs the user that the carbon dioxide concentration in the room is a normal value when the carbon dioxide concentration in the indoor space is normal.
In order to accurately determine whether the carbon dioxide concentration in the room is a normal value, in a preferred embodiment of the present application, the change phase includes a first phase, a second phase, a third phase and a fourth phase, and the determining the normal sampling time of the carbon dioxide concentration according to the change phase specifically includes:
if the carbon dioxide concentration in the sampling sequence sequentially passes through the first stage, the second stage, the third stage and the fourth stage, determining the normal sampling time according to the ending time of the fourth stage;
the first stage comprises a first sampling value and a second sampling value which are adjacent, and the difference value between the second sampling value and the first sampling value is not smaller than a first preset difference value; the second stage comprises a third sampling value, a fourth sampling value and a fifth sampling value which are adjacent, wherein the third sampling value is not greater than the fourth sampling value and the fourth sampling value is not greater than the fifth sampling value; the third stage comprises a sixth sampling value and a seventh sampling value which are adjacent, and the difference value between the sixth sampling value and the seventh sampling value is not smaller than the first preset difference value; the fourth stage comprises an eighth sampling value and a ninth sampling value which are adjacent, and the difference value between the eighth sampling value and the ninth sampling value is not larger than a second preset difference value.
Specifically, the air conditioner divides the time into a plurality of phases according to the relation between the carbon dioxide concentration and the sampling time interval in fig. 6, and when the sampling value in the carbon dioxide sensor sequentially satisfies all phases, the normal sampling time is determined, that is, the user is informed that the carbon dioxide concentration in the room is a normal value.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and the time is divided into a plurality of different phases according to the relationship between the carbon dioxide concentration and the sampling time interval, where the number of different phases is all within the protection scope of the present application.
In order to display the second prompt information to the user, in a preferred embodiment of the present application, the method further comprises: before the normal sampling time, displaying first prompt information which does not comprise the normal carbon dioxide concentration to a user; and after the normal sampling time, displaying second prompt information comprising the normal carbon dioxide concentration to the user.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and other ways of prompting the user that the concentration of carbon dioxide in the room is a normal value are all within the scope of protection of the present application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. An air conditioner, comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an indoor heat exchanger operating as a condenser or an evaporator;
an indoor fan for introducing air flow through the suction inlet and sending out through the air outlet after passing through the indoor heat exchanger;
the fresh air fan is used for providing outdoor fresh air for the indoor;
a carbon dioxide concentration sensor for detecting the concentration of carbon dioxide in the room;
the controller is configured to receive a sampling sequence of the carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval;
determining the normal sampling time of the carbon dioxide concentration according to the change stage;
determining the normal carbon dioxide concentration according to the sampling value of the carbon dioxide concentration after the normal sampling time;
the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence.
2. The air conditioner of claim 1, wherein the controller is further specifically configured to: the change phase comprises a first phase, a second phase, a third phase and a fourth phase, and the normal sampling moment of the carbon dioxide concentration is determined according to the change phase, specifically: if the carbon dioxide concentration in the sampling sequence sequentially passes through the first stage, the second stage, the third stage and the fourth stage, determining the normal sampling time according to the ending time of the fourth stage;
the first stage comprises a first sampling value and a second sampling value which are adjacent, and the difference value between the second sampling value and the first sampling value is not smaller than a first preset difference value; the second stage comprises a third sampling value, a fourth sampling value and a fifth sampling value which are adjacent, wherein the third sampling value is not greater than the fourth sampling value and the fourth sampling value is not greater than the fifth sampling value; the third stage comprises a sixth sampling value and a seventh sampling value which are adjacent, and the difference value between the sixth sampling value and the seventh sampling value is not smaller than the first preset difference value; the fourth stage comprises an eighth sampling value and a ninth sampling value which are adjacent, and the difference value between the eighth sampling value and the ninth sampling value is not larger than a second preset difference value.
3. The air conditioner of claim 1, wherein the controller is further specifically configured to: before the normal sampling time, displaying first prompt information which does not comprise the normal carbon dioxide concentration to a user;
and after the normal sampling time, displaying second prompt information comprising the normal carbon dioxide concentration to the user.
4. A carbon dioxide concentration detection method is characterized by being applied to an air conditioner comprising a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor fan, a fresh air fan, a carbon dioxide concentration sensor and a controller, and comprises the steps of receiving a sampling sequence of carbon dioxide concentration sent by the carbon dioxide concentration sensor after the indoor fan or the fresh air fan is started according to a preset sampling interval;
determining the normal sampling time of the carbon dioxide concentration according to the change stage;
determining the normal carbon dioxide concentration according to the sampling value of the carbon dioxide concentration after the normal sampling time;
the change phase is determined according to the comparison result of the carbon dioxide concentration at adjacent moments in the sampling sequence.
5. The method according to claim 4, wherein the change phases comprise a first phase, a second phase, a third phase and a fourth phase, and the normal sampling time of the carbon dioxide concentration is determined according to the change phases, specifically: if the carbon dioxide concentration in the sampling sequence sequentially passes through the first stage, the second stage, the third stage and the fourth stage, determining the normal sampling time according to the ending time of the fourth stage;
the first stage comprises a first sampling value and a second sampling value which are adjacent, and the difference value between the second sampling value and the first sampling value is not smaller than a first preset difference value; the second stage comprises a third sampling value, a fourth sampling value and a fifth sampling value which are adjacent, wherein the third sampling value is not greater than the fourth sampling value and the fourth sampling value is not greater than the fifth sampling value; the third stage comprises a sixth sampling value and a seventh sampling value which are adjacent, and the difference value between the sixth sampling value and the seventh sampling value is not smaller than the first preset difference value; the fourth stage comprises an eighth sampling value and a ninth sampling value which are adjacent, and the difference value between the eighth sampling value and the ninth sampling value is not larger than a second preset difference value.
6. The method of claim 4, wherein the method further comprises: before the normal sampling time, displaying first prompt information which does not comprise the normal carbon dioxide concentration to a user;
and after the normal sampling time, displaying second prompt information comprising the normal carbon dioxide concentration to the user.
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