Air conditioner and control method thereof

Abstract

The present invention discloses an air conditioner and a control method thereof. It is unnecessary to install an indoor air state sensor (such as a CO2 concentration sensor or a PM2.5 concentration sensor) on the air conditioner. Only a humidity sensor is added on the basis of a conventional air conditioner sensor. By collecting indoor temperature, indoor humidity and outdoor temperature, the outdoor temperature and indoor humidity are respectively compared with corresponding threshold values. The working states of a fresh air device and an electric heating device are controlled according to the comparison results. The indoor temperature and outdoor temperature are respectively compared with corresponding threshold values. The operation mode of the air conditioner is controlled according to the comparison results. The operation state of the air conditioner can be automatically adjusted to achieve a comfortable, energy-saving and healthy effect.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a control method thereof. Background Art

[0002] The refrigeration system of a conventional air conditioner is mainly divided into four parts: compressor, condenser, throttling device, and evaporator. The compressor, condenser, and throttling device are generally installed in the outdoor unit, and the evaporator is installed in the indoor unit, mainly realizing the functions of cooling, heating, and dehumidification. In recent years, as people pay more attention to health, fresh air air conditioning has become a trend. Unlike conventional air conditioning, fresh air air conditioning not only introduces fresh air from the outside, but also brings in cold, hot air and moisture, which causes changes in the air state in the room. At present, the control of fresh air air conditioning is generally based on the sampling data of indoor air quality sensors (such as CO2 concentration sensors or PM2.5 concentration sensors) to judge the air quality and take corresponding actions, but the price of air quality sensors is relatively high, which limits their wide application in mid- and low-end fresh air air conditioners. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide an air conditioner and a control method thereof, which does not have an indoor air quality sensor and can automatically adjust the operating state of the air conditioner by collecting indoor temperature, indoor humidity and outdoor temperature to achieve comfortable, energy-saving and healthy effects.

[0004] To achieve the above object, an embodiment of the present invention provides an air conditioner, comprising:

[0005] Indoor unit, used to adjust the temperature and humidity of indoor air;

[0006] An outdoor unit connected to the indoor unit via a connection pipe;

[0007] A fresh air device is provided in the outdoor unit or the indoor unit and is used to transport outdoor air to the indoor room;

[0008] The controller is used to obtain the outdoor temperature, and control the operation of the fresh air device when it is detected that the outdoor temperature is less than or equal to a first outdoor high temperature threshold and greater than a first outdoor low temperature threshold; obtain the indoor humidity when it is detected that the outdoor temperature is less than a second outdoor high temperature threshold and greater than the first outdoor high temperature threshold; control the fresh air device to stop operating when it is detected that the indoor humidity is greater than or equal to a high humidity threshold; wherein the second outdoor high temperature threshold is greater than the first outdoor high temperature threshold, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold.

[0009] As an improvement of the above scheme, the controller is also used to control the operation of the fresh air device when it is detected that the indoor humidity is less than or equal to a low humidity threshold; when it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, the controller is used to control the fresh air device to maintain the current operating state unchanged.

[0010] As an improvement of the above solution, the controller is also used to control the fresh air device to stop working when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or less than or equal to the first outdoor low temperature threshold.

[0011] As an improvement of the above solution, the air conditioner further comprises:

[0012] An electric heating device, arranged in the outdoor unit, for heating the air delivered to the room;

[0013] The controller is further configured to:

[0014] When it is detected that the outdoor temperature is greater than or equal to a second outdoor high temperature threshold, or less than or equal to a first outdoor low temperature threshold, controlling the electric heating device to be turned off;

[0015] When it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold and greater than the first outdoor low temperature threshold, the electric heating device is controlled to turn on; wherein the second outdoor low temperature threshold is less than the first outdoor high temperature threshold, and the second outdoor low temperature threshold is greater than the first outdoor low temperature threshold.

[0016] As an improvement of the above solution, after obtaining the indoor humidity, the controller is further used to:

[0017] When it is detected that the indoor humidity is greater than or equal to a high humidity threshold, controlling the electric heating device to be turned off;

[0018] When it is detected that the indoor humidity is less than or equal to a low humidity threshold, the electric heating device is controlled to operate cyclically according to a preset on / off time;

[0019] When it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, the electric heating device is controlled to maintain the current operating state unchanged.

[0020] As an improvement of the above solution, the controller is also used for:

[0021] Get the indoor temperature;

[0022] When the indoor temperature is greater than the indoor high temperature threshold, controlling the air conditioner to enter a cooling mode;

[0023] When the indoor temperature is less than or equal to the indoor high temperature threshold and greater than the indoor medium temperature threshold, determine whether the outdoor temperature is less than or equal to the target low temperature threshold, if so, control the air conditioner to enter the air supply mode, if not, control the air conditioner to enter the dehumidification mode;

[0024] When the indoor temperature is less than or equal to the indoor medium temperature threshold and greater than the indoor low temperature threshold, controlling the air conditioner to enter the air supply mode;

[0025] When the indoor temperature is less than or equal to the indoor low temperature threshold, determine whether the outdoor temperature is greater than or equal to the target high temperature threshold. If so, control the air conditioner to enter the air supply mode; otherwise, control the air conditioner to enter the heating mode; wherein, the target high temperature threshold is less than the second outdoor high temperature threshold, the target low temperature threshold is less than the target high temperature threshold, and the target low temperature threshold is greater than the first outdoor low temperature threshold.

[0026] To achieve the above object, an embodiment of the present invention further provides an air conditioner control method, wherein an indoor unit or an outdoor unit of the air conditioner is provided with a fresh air device for conveying outdoor air to indoor space, and the air conditioner control method comprises:

[0027] Get the outdoor temperature;

[0028] When it is detected that the outdoor temperature is less than or equal to a first outdoor high temperature threshold and greater than a first outdoor low temperature threshold, controlling the fresh air device to operate;

[0029] When it is detected that the outdoor temperature is less than the second outdoor high temperature threshold and greater than the first outdoor high temperature threshold, obtaining the indoor humidity;

[0030] When it is detected that the indoor humidity is greater than or equal to the high humidity threshold, the fresh air device is controlled to stop running; wherein, the second outdoor high temperature threshold is greater than the first outdoor high temperature threshold, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold.

[0031] As an improvement of the above solution, the method further includes:

[0032] When it is detected that the indoor humidity is less than or equal to a low humidity threshold, controlling the fresh air device to operate;

[0033] When it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, the fresh air device is controlled to maintain the current operating state unchanged.

[0034] As an improvement of the above solution, the method further includes:

[0035] When it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or is less than or equal to the first outdoor low temperature threshold, the fresh air device is controlled to stop working.

[0036] As an improvement of the above solution, the air conditioner further includes an electric heating device for heating the air delivered to the room; then, the air conditioner control method further includes:

[0037] When it is detected that the outdoor temperature is greater than or equal to a second outdoor high temperature threshold, or less than or equal to a first outdoor low temperature threshold, controlling the electric heating device to be turned off;

[0038] When it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold and greater than the first outdoor low temperature threshold, the electric heating device is controlled to turn on; wherein the second outdoor low temperature threshold is less than the first outdoor high temperature threshold, and the second outdoor low temperature threshold is greater than the first outdoor low temperature threshold.

[0039] Compared with the prior art, the air conditioner and control method thereof described in the embodiment of the present invention do not need to install an indoor air conditioner sensor (such as a CO2 concentration sensor or a PM2.5 concentration sensor). Only a humidity sensor is added to the conventional air conditioner sensor. By collecting the indoor temperature, indoor humidity and outdoor temperature, the outdoor temperature and indoor humidity are compared with the corresponding thresholds respectively. The working states of the fresh air device and the electric heating device are controlled according to the comparison results. The indoor temperature and outdoor temperature are compared with the corresponding thresholds respectively. The operation mode of the air conditioner is controlled according to the comparison results. The operation state of the air conditioner can be automatically adjusted to achieve comfortable, energy-saving and healthy effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the external structure of an air conditioner provided by an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the internal framework of an air conditioner provided by an embodiment of the present invention;

[0042] Figure 3 is another internal frame schematic diagram of an air conditioner provided by an embodiment of the present invention;

[0043] Figure 4 is a first working flow diagram of a controller in an air conditioner provided by an embodiment of the present invention;

[0044] Figure 5 is a second working flow chart of the controller in the air conditioner provided by an embodiment of the present invention;

[0045] Figure 6 is a third working flow diagram of the controller in the air conditioner provided by the embodiment of the present invention;

[0046] Figure 7 is a fourth working flow diagram of a controller in an air conditioner provided by an embodiment of the present invention;

[0047] Figure 8 is a fifth working flow chart of the controller in the air conditioner provided by the embodiment of the present invention;

[0048] Fig. 9 is a sixth working flow diagram of a controller in an air conditioner provided by an embodiment of the present invention;

[0049] Fig.10 The present invention provides a flowchart of an air conditioner control method.

[0050] Among them, 100, indoor unit; 200, outdoor unit; 11, compressor; 12, four-way valve; 13, outdoor heat exchanger; 14, throttling device; 15, indoor heat exchanger; 16, indoor fan; 17, outdoor fan; 18, indoor ambient temperature sensor; 19, outdoor ambient temperature sensor; 20, indoor humidity sensor; 21, fresh air device; 22, electric heating device. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] See also Figure 1 , Figure 1 It is a structural diagram of an air conditioner provided by an embodiment of the present invention. The air conditioner described in the embodiment of the present invention includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 is used to adjust the temperature and humidity of indoor air, and the indoor unit 100 includes an indoor fan; the outdoor unit 200 is connected to the indoor unit 100 through an online pipe, the outdoor unit 200 is installed outdoors, and the indoor unit 100 is installed indoors. A fresh air supply device is installed in the outdoor unit 200 to transport outdoor air to the room, and the fresh air supply device includes an outdoor air inlet, a fresh air fan and an indoor air supply port; the indoor fan is arranged in the indoor unit of the air conditioner; the control unit controls the operation of the fresh air fan according to the rotation speed and air quality of the indoor fan.

[0056] See also Figure 2 , Figure 2 is a schematic diagram of the internal structure of an air conditioner provided in an embodiment of the present invention, in which the fresh air device is arranged in the indoor unit 100; see Figure 3 , Figure 3 2 is another schematic diagram of the internal structure of the air conditioner provided in an embodiment of the present invention, in which the fresh air device is arranged in the outdoor unit 200.

[0057] The air conditioner comprises a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a throttling device 14, an indoor heat exchanger 15, an indoor fan 16, an outdoor fan 17, an indoor ambient temperature sensor 18, an outdoor ambient temperature sensor 19, an indoor humidity sensor 20, a fresh air device 21 and an electric heating device 22. The evaporator 15, the indoor fan 16 and the indoor ambient temperature sensor 18 are arranged on the indoor unit, and the compressor 11, the four-way valve 12, the condenser 13, the throttling device 14, the outdoor fan 17 and the outdoor ambient temperature sensor 19 are arranged on the outdoor unit. The electric heating device 22 is arranged in the outdoor unit and is used to heat the air delivered to the room.

[0058] The air conditioner described in the embodiment of the present invention includes a cooling condition and a heating condition. When the air conditioner is cooling, the refrigerant first passes through the compressor to become a high-pressure gas, and then passes through the outdoor unit heat exchanger (condenser) to condense and release heat to become a high-pressure liquid. The high-pressure liquid passes through the throttling device and becomes a low-temperature, low-pressure liquid. It evaporates and absorbs heat through the indoor unit heat exchanger (evaporator) to become a low-temperature, low-pressure gas, and finally returns to the compressor. When the air conditioner is heating, the refrigerant first passes through the compressor to become a high-pressure gas, and then passes through the indoor unit heat exchanger (condenser) to condense and release heat to become a high-pressure liquid. The high-pressure liquid passes through the throttling device and becomes a low-temperature, low-pressure liquid. The low-temperature, low-pressure liquid evaporates and absorbs heat through the outdoor unit heat exchanger (evaporator) to become a low-temperature, low-pressure gas, and finally returns to the compressor.

[0059] Exemplarily, the refrigerant flows in different directions during cooling and heating. During cooling, it first flows through the outdoor unit heat exchanger, at which time the outdoor unit is a condenser and the indoor unit is an evaporator; during heating, the refrigerant first flows through the indoor unit heat exchanger, at which time the indoor unit is a condenser and the outdoor unit is an evaporator. In different states of cooling and heating, the air conditioner changes the flow direction of the refrigerant through a four-way valve. Without a four-way valve, the air conditioner can only achieve single cooling or heating, and cannot switch between cooling and heating. The present invention achieves indoor fresh air supply by installing the fresh air device on the outdoor unit or the indoor unit to connect with the indoor environment. Furthermore, the fresh air device includes an outdoor air inlet, a fresh air fan and an indoor air supply port, and these three components form a closed air flow channel. After the fresh air is started, the airflow direction flows through the outdoor air inlet, the fresh air fan, the indoor air supply port in sequence, and then is transported to the room.

[0060] Specifically, the controller in the air conditioner is used to: obtain the outdoor temperature, and control the operation of the fresh air device when it is detected that the outdoor temperature is less than or equal to the first outdoor high temperature threshold TG, and greater than the first outdoor low temperature threshold TH; obtain the indoor humidity when it is detected that the outdoor temperature is less than the second outdoor high temperature threshold TA, and greater than the first outdoor high temperature threshold TG; control the fresh air device to stop operating when it is detected that the indoor humidity is greater than or equal to the high humidity threshold RHA; wherein the second outdoor high temperature threshold TA is greater than the first outdoor high temperature threshold TG, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold TH, that is, TA>TG>TH.

[0061] For example, see Figure 4 , Figure 4 is a first working flow chart of a controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S11 to S17:

[0062] S11, obtain the outdoor temperature, and then proceed to step S12.

[0063] S12, determine whether the outdoor temperature satisfies: less than or equal to the first outdoor high temperature threshold TG, and greater than the first outdoor low temperature threshold TH, that is, TG≥outdoor temperature>TH. If so, proceed to step S13, if not, proceed to step S14.

[0064] S13, when TG≥outdoor temperature>TH is satisfied, the fresh air device is controlled to operate, which means that the outdoor temperature is moderate at this time, and starting the fresh air supply will not cause the indoor temperature to be too high or too low.

[0065] S14. When TG≥outdoor temperature>TH is not satisfied, further determine whether the outdoor temperature satisfies: less than the second outdoor high temperature threshold TA, and greater than the first outdoor high temperature threshold TG, that is, TA>outdoor temperature>TG. If so, proceed to step S15, if not, execute the remaining control logic.

[0066] S15. When TA>outdoor temperature>TG is satisfied, it means that the indoor temperature is relatively high at this time, and the indoor humidity is further obtained, and then the process goes to step S16.

[0067] S16, determine whether the indoor humidity is greater than or equal to the high humidity threshold, that is, whether the indoor humidity ≥ RHA is satisfied. If so, proceed to step S17, otherwise, execute the remaining control logic.

[0068] S17. When the indoor humidity ≥ RHA is satisfied, it indicates that the outdoor air humidity is too high and it is not suitable to deliver outdoor air into the room. Therefore, the fresh air device is controlled to stop running.

[0069] In an embodiment of the present invention,

[0070] Specifically, the controller is also used to: when it is detected that the indoor humidity is less than or equal to the low humidity threshold RHB, control the fresh air device to operate; when it is detected that the indoor humidity is less than the high humidity threshold RHA and greater than the low humidity threshold RHB, control the fresh air device to maintain the current operating state unchanged

[0071] For example, see Figure 5 , Figure 5 is a second working flow chart of the controller provided in an embodiment of the present invention. After executing steps S11 to S17, the controller is further configured to execute steps S18 to S19:

[0072] S18. When the indoor humidity is less than or equal to RHB, it indicates that the humidity of the outdoor air is too low and it is not suitable to supply the outdoor air into the room. At this time, the fresh air device is controlled to stop running.

[0073] S19. When RHA> indoor humidity> RHB is satisfied, the fresh air device is controlled to maintain the current operating state. At this time, the humidity is moderate and air can continue to be supplied into the room. However, if the fresh air device was shut down in the previous stage, it does not need to be restarted at this time. For example, if the fresh air device was in the working state in the previous stage, it continues to be in the working state; if the fresh air device was in the shut down state in the previous stage, it continues to be in the shut down state.

[0074] Specifically, the controller is further used to control the fresh air device to stop working when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold TA, or less than or equal to the first outdoor low temperature threshold TH.

[0075] For example, see Figure 6 , Figure 6 is a third working flow chart of the controller provided in an embodiment of the present invention. After executing steps S11 to S17, the controller is further configured to execute step S20:

[0076] S20, when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold TA, or less than or equal to the first outdoor low temperature threshold TH, that is, when the outdoor temperature ≥TA or the outdoor temperature ≤TH is satisfied, the fresh air device is controlled to stop working. This means that the outdoor temperature is too high / too low at this time, and starting the fresh air supply will cause the indoor temperature to be too high / too low.

[0077] Specifically, the controller is also used to: control the electric heating device to turn off when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold TA, or less than or equal to the first outdoor low temperature threshold TH; control the electric heating device to turn on when it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold TI, and greater than the first outdoor low temperature threshold TH; wherein the second outdoor low temperature threshold TI is less than the first outdoor high temperature threshold TG, and the second outdoor low temperature threshold TI is greater than the first outdoor low temperature threshold TH, that is, TA>TG>TI>TH.

[0078] For example, see Figure 7 , Figure 7 is a fourth working flow chart of the controller provided in an embodiment of the present invention, wherein the controller is further configured to execute steps S21 to S26:

[0079] S21. Obtain the outdoor temperature, and then proceed to step S21.

[0080] S22, determine whether the outdoor temperature satisfies: greater than or equal to the second outdoor high temperature threshold TA, or less than or equal to the first outdoor low temperature threshold TH, that is, when the outdoor temperature is greater than or equal to TA or the outdoor temperature is less than or equal to TH, if so, proceed to step S23, if not, proceed to step S24.

[0081] S23. When the outdoor temperature ≥TA or the outdoor temperature ≤TH is satisfied, since the fresh air device stops running in step S20, there is no need to start the electric heating device at this time.

[0082] S24, judging whether the outdoor temperature satisfies: less than or equal to the second outdoor low temperature threshold TI, and greater than the first outdoor low temperature threshold TH, that is, satisfying TI≥outdoor temperature>TH, if so, proceed to step S25, if not, proceed to step S26.

[0083] S25. When TI≥outdoor temperature>TH is satisfied, since the fresh air device has been started in step S13 and the outdoor temperature is relatively low at this time, the electric heating device can be started to send the air into the room for electric heating.

[0084] S26. When TA>outdoor temperature>TG is satisfied, the indoor humidity is obtained, and then the remaining control logic is entered.

[0085] Specifically, after obtaining the indoor humidity, the controller is also used to: when it is detected that the indoor humidity is greater than or equal to the high humidity threshold RHA, control the electric heating device to turn off; when it is detected that the indoor humidity is less than or equal to the low humidity threshold RHB, control the electric heating device to cycle according to the preset start and stop time; when it is detected that the indoor humidity is less than the high humidity threshold RHA and greater than the low humidity threshold RHB, control the electric heating device to maintain the current operating state unchanged.

[0086] For example, see Figure 8 , Figure 8 is a fifth working flow chart of the controller provided in an embodiment of the present invention. After executing steps S21 to S26, the controller is further configured to execute steps S261 to S263:

[0087] S261, when it is detected that the indoor humidity is greater than or equal to the high humidity threshold RHA, that is, when the indoor humidity ≥ RHA is satisfied, since the fresh air device stops running in step S17, the electric heating device is also controlled to be turned off;

[0088] S262, when it is detected that the indoor humidity is less than or equal to the low humidity threshold RHB, that is, when the indoor humidity satisfies the indoor humidity ≤ RHB, in step S18, the fresh air device is in operation, and the electric heating device is controlled to work in a cycle according to the preset start-stop time, such as a 3-minute start-stop 3-minute cycle, to avoid excessively high temperature of the fresh air delivered into the room;

[0089] S263: When it is detected that the indoor humidity is less than the high humidity threshold RHA and greater than the low humidity threshold RHB, that is, RHA>indoor humidity>RHB is satisfied, the electric heating device is controlled to maintain the current operating state unchanged.

[0090] Specifically, the controller is also used to: obtain the indoor temperature; when the indoor temperature is greater than the indoor high temperature threshold TB, control the air conditioner to enter the cooling mode; when the indoor temperature is less than or equal to the indoor high temperature threshold TB, and greater than the indoor medium temperature threshold TC, determine whether the outdoor temperature is less than or equal to the target low temperature threshold TF, if so, control the air conditioner to enter the air supply mode, otherwise, control the air conditioner to enter the dehumidification mode; when the indoor temperature is less than or equal to the indoor medium temperature threshold TC, and greater than the indoor low temperature threshold TD, control the air conditioner to enter the air supply mode; when the indoor temperature is less than or equal to the indoor low temperature threshold TD, determine whether the outdoor temperature is greater than or equal to the target high temperature threshold TE, if so, control the air conditioner to enter the air supply mode, otherwise, control the air conditioner to enter the heating mode; wherein the target high temperature threshold TE is less than the outdoor second high temperature threshold TA, the target low temperature threshold TF is less than the target high temperature threshold TE, and the target low temperature threshold TE is greater than the outdoor first low temperature threshold TH, that is, it satisfies: TA>TE>TF>TH, TA>TB>TC>TD>TH.

[0091] For example, see Fig. 9 , Fig. 9 is a sixth working flow chart of the controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S31 to S41:

[0092] S31, obtain the indoor temperature, and then go to step S32.

[0093] S32, judging whether the indoor temperature satisfies: the indoor temperature is greater than the indoor high temperature threshold TB, that is, the indoor temperature>TB is satisfied. If so, proceed to step S33, if not, proceed to step S34.

[0094] S33. When the indoor temperature > TB, the air conditioner in the control room enters the cooling mode; this indicates that the indoor temperature is too high (and has not reached the set temperature) and needs cooling.

[0095] S34, determine whether the indoor temperature satisfies: less than or equal to the indoor high temperature threshold TB, and greater than the indoor medium temperature threshold TC, that is, TB≥indoor temperature>TC. If so, proceed to step S35, otherwise proceed to step S37.

[0096] S35. When TB≥indoor temperature>TC is satisfied, further determine whether the outdoor temperature satisfies: less than or equal to the target low temperature threshold TF, that is, outdoor temperature≤TF. If so, proceed to step S38; otherwise, proceed to step S36.

[0097] S36: When the outdoor temperature ≤ TF is satisfied, control the air conditioner to enter a dehumidification mode.

[0098] S37, determine whether the indoor temperature satisfies: less than or equal to the indoor medium temperature threshold TC, and greater than the indoor low temperature threshold TD, that is, TC≥indoor temperature>TD. If so, proceed to step S38, otherwise proceed to step S39.

[0099] S38, controlling the air conditioner to enter air supply mode.

[0100] S39, determine whether the indoor temperature satisfies: less than or equal to the indoor low temperature threshold TD, if so, proceed to step S40, if not, return to step S32.

[0101] S40, determining whether the outdoor temperature satisfies: being greater than or equal to the target high temperature threshold TE, if so, proceeding to step S38, if not, proceeding to step S41.

[0102] S41, controlling the air conditioner to enter a heating mode.

[0103] In the embodiment of the present invention, by comparing the indoor temperature and the outdoor temperature with the corresponding threshold values ​​respectively, the operation mode of the air conditioner is controlled according to the comparison results, so that the operation state of the air conditioner can be automatically adjusted.

[0104] Compared with the prior art, the air conditioner described in the embodiment of the present invention does not need to install an indoor air conditioner sensor (such as a CO2 concentration sensor or a PM2.5 concentration sensor). It only adds a humidity sensor on the basis of the conventional air conditioning sensor. By collecting the indoor temperature, indoor humidity and outdoor temperature, the outdoor temperature and indoor humidity are compared with the corresponding thresholds respectively. The working states of the fresh air device and the electric heating device are controlled according to the comparison results. The indoor temperature and outdoor temperature are compared with the corresponding thresholds respectively. The operation mode of the air conditioner is controlled according to the comparison results. The operation state of the air conditioner can be automatically adjusted to achieve comfortable, energy-saving and healthy effects.

[0105] See also Fig.10 , Fig.10 1 is a flow chart of an air conditioner control method provided by an embodiment of the present invention. The air conditioner control method is implemented by a controller of the air conditioner. The indoor unit or outdoor unit of the air conditioner is provided with a fresh air device for conveying outdoor air to indoor space. The air conditioner control method includes:

[0106] S1, obtain outdoor temperature;

[0107] S2. When it is detected that the outdoor temperature is less than or equal to a first outdoor high temperature threshold and greater than a first outdoor low temperature threshold, controlling the fresh air device to operate;

[0108] S3, when it is detected that the outdoor temperature is less than the second outdoor high temperature threshold and greater than the first outdoor high temperature threshold, obtaining the indoor humidity;

[0109] S4. When it is detected that the indoor humidity is greater than or equal to the high humidity threshold, the fresh air device is controlled to stop running; wherein, the second outdoor high temperature threshold is greater than the first outdoor high temperature threshold, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold.

[0110] Specifically, the method also includes: when it is detected that the indoor humidity is less than or equal to a low humidity threshold, controlling the fresh air device to operate; when it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, controlling the fresh air device to maintain the current operating state unchanged.

[0111] Specifically, the method further includes: when it is detected that the outdoor temperature is greater than or equal to a second outdoor high temperature threshold, or is less than or equal to a first outdoor low temperature threshold, controlling the fresh air device to stop working.

[0112] Specifically, the air conditioner also includes an electric heating device for heating the air delivered to the indoor room; then, the air conditioner control method also includes: when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or less than or equal to the first outdoor low temperature threshold, controlling the electric heating device to turn off; when it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold, and greater than the first outdoor low temperature threshold, controlling the electric heating device to turn on; wherein, the second outdoor low temperature threshold is less than the first outdoor high temperature threshold, and the second outdoor low temperature threshold is greater than the first outdoor low temperature threshold.

[0113] Specifically, after obtaining the indoor humidity, the method also includes: when it is detected that the indoor humidity is greater than or equal to a high humidity threshold, controlling the electric heating device to turn off; when it is detected that the indoor humidity is less than or equal to a low humidity threshold, controlling the electric heating device to cycle according to a preset start and stop time; when it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, controlling the electric heating device to maintain the current operating state unchanged.

[0114] Specifically, the method also includes: obtaining the indoor temperature; when the indoor temperature is greater than the indoor high temperature threshold, controlling the air conditioner to enter the cooling mode; when the indoor temperature is less than or equal to the indoor high temperature threshold, and greater than the indoor medium temperature threshold, judging whether the outdoor temperature is less than or equal to the target low temperature threshold, if so, controlling the air conditioner to enter the air supply mode, otherwise controlling the air conditioner to enter the dehumidification mode; when the indoor temperature is less than or equal to the indoor medium temperature threshold, and greater than the indoor low temperature threshold, controlling the air conditioner to enter the air supply mode; when the indoor temperature is less than or equal to the indoor low temperature threshold, judging whether the outdoor temperature is greater than or equal to the target high temperature threshold, if so, controlling the air conditioner to enter the air supply mode, otherwise controlling the air conditioner to enter the heating mode; wherein, the target high temperature threshold is less than the second outdoor high temperature threshold, the target low temperature threshold is less than the target high temperature threshold, and the target low temperature threshold is greater than the first outdoor low temperature threshold.

[0115] It is worth noting that the working process of the air conditioner control method described in the embodiment of the present invention can refer to the working process of the controller in the air conditioner described in the above embodiment, which will not be repeated here.

[0116] Compared with the prior art, the air conditioner control method described in the embodiment of the present invention does not need to install an indoor air conditioner sensor (such as a CO2 concentration sensor or a PM2.5 concentration sensor). It only adds a humidity sensor on the basis of a conventional air conditioner sensor. By collecting the indoor temperature, indoor humidity and outdoor temperature, the outdoor temperature and indoor humidity are compared with the corresponding thresholds respectively. The working states of the fresh air device and the electric heating device are controlled according to the comparison results. The indoor temperature and outdoor temperature are compared with the corresponding thresholds respectively. The operation mode of the air conditioner is controlled according to the comparison results. The operation state of the air conditioner can be automatically adjusted to achieve a comfortable, energy-saving and healthy effect.

[0117] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that: include: Indoor unit, used to adjust the temperature and humidity of indoor air; An outdoor unit connected to the indoor unit via a connection pipe; A fresh air device is provided in the outdoor unit or the indoor unit and is used to transport outdoor air to the indoor room; An electric heating device, arranged in the outdoor unit, for heating the air delivered to the room; A controller, for obtaining an outdoor temperature, and controlling the operation of the fresh air device when detecting that the outdoor temperature is less than or equal to a first outdoor high temperature threshold and greater than a first outdoor low temperature threshold; When it is detected that the outdoor temperature is less than the second outdoor high temperature threshold and greater than the first outdoor high temperature threshold, obtaining the indoor humidity; When it is detected that the indoor humidity is greater than or equal to the high humidity threshold, the fresh air device is controlled to stop running; wherein the second outdoor high temperature threshold is greater than the first outdoor high temperature threshold, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold; When it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or less than or equal to the first outdoor low temperature threshold, the electric heating device is controlled to be turned off; when it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold, and greater than the first outdoor low temperature threshold, the electric heating device is controlled to be turned on; wherein the second outdoor low temperature threshold is less than the first outdoor high temperature threshold, and the second outdoor low temperature threshold is greater than the first outdoor low temperature threshold.

2. The air conditioner according to claim 1, characterized in that: The controller is also used to control the operation of the fresh air device when it is detected that the indoor humidity is less than or equal to a low humidity threshold; and to control the fresh air device to maintain the current operating state when it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold.

3. The air conditioner according to claim 1, characterized in that: The controller is also used to control the fresh air device to stop working when it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or less than or equal to the first outdoor low temperature threshold.

4. The air conditioner according to claim 1, characterized in that: After obtaining the indoor humidity, the controller is further used to: When it is detected that the indoor humidity is greater than or equal to a high humidity threshold, controlling the electric heating device to be turned off; When it is detected that the indoor humidity is less than or equal to a low humidity threshold, the electric heating device is controlled to operate cyclically according to a preset on / off time; When it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, the electric heating device is controlled to maintain the current operating state unchanged.

5. The air conditioner according to claim 1, characterized in that: The controller is also used for: Get the indoor temperature; When the indoor temperature is greater than the indoor high temperature threshold, controlling the air conditioner to enter a cooling mode; When the indoor temperature is less than or equal to the indoor high temperature threshold and greater than the indoor medium temperature threshold, determine whether the outdoor temperature is less than or equal to the target low temperature threshold, if so, control the air conditioner to enter the air supply mode, if not, control the air conditioner to enter the dehumidification mode; When the indoor temperature is less than or equal to the indoor medium temperature threshold and greater than the indoor low temperature threshold, controlling the air conditioner to enter the air supply mode; When the indoor temperature is less than or equal to the indoor low temperature threshold, determine whether the outdoor temperature is greater than or equal to the target high temperature threshold. If so, control the air conditioner to enter the air supply mode; otherwise, control the air conditioner to enter the heating mode; wherein, the target high temperature threshold is less than the second outdoor high temperature threshold, the target low temperature threshold is less than the target high temperature threshold, and the target low temperature threshold is greater than the first outdoor low temperature threshold.

6. An air conditioner control method, characterized in that: The indoor unit or the outdoor unit of the air conditioner is provided with a fresh air device for conveying outdoor air to the indoor room, the air conditioner also includes an electric heating device for heating the air conveyed to the indoor room, and the air conditioner control method includes: Get the outdoor temperature; When it is detected that the outdoor temperature is less than or equal to a first outdoor high temperature threshold and greater than a first outdoor low temperature threshold, controlling the fresh air device to operate; When it is detected that the outdoor temperature is less than the second outdoor high temperature threshold and greater than the first outdoor high temperature threshold, obtaining the indoor humidity; When it is detected that the indoor humidity is greater than or equal to the high humidity threshold, the fresh air device is controlled to stop running; wherein the second outdoor high temperature threshold is greater than the first outdoor high temperature threshold, and the first outdoor high temperature threshold is greater than the first outdoor low temperature threshold; When it is detected that the outdoor temperature is greater than or equal to a second outdoor high temperature threshold, or less than or equal to a first outdoor low temperature threshold, controlling the electric heating device to be turned off; When it is detected that the outdoor temperature is less than or equal to the second outdoor low temperature threshold and greater than the first outdoor low temperature threshold, the electric heating device is controlled to turn on; wherein the second outdoor low temperature threshold is less than the first outdoor high temperature threshold, and the second outdoor low temperature threshold is greater than the first outdoor low temperature threshold.

7. The air conditioner control method according to claim 6, characterized in that: The method further comprises: When it is detected that the indoor humidity is less than or equal to a low humidity threshold, controlling the fresh air device to operate; When it is detected that the indoor humidity is less than the high humidity threshold and greater than the low humidity threshold, the fresh air device is controlled to maintain the current operating state unchanged.

8. The air conditioner control method according to claim 6, characterized in that: The method further comprises: When it is detected that the outdoor temperature is greater than or equal to the second outdoor high temperature threshold, or is less than or equal to the first outdoor low temperature threshold, the fresh air device is controlled to stop working.

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