Air conditioner and control method thereof for reducing indoor temperature fluctuation

Abstract

The present application relates to air conditioning equipment technical field, especially to a kind of air conditioner and its control method for reducing indoor temperature fluctuation.The method can detect the change rate of indoor environment temperature, judge the actual heat load in the room, when the compressor is started again to operate refrigeration or heating, select the appropriate indoor heat exchanger evaporation temperature (when operating refrigeration) or indoor heat exchanger condensation temperature (when operating heating), control the heat exchange capacity of indoor heat exchanger by controlling the evaporation temperature or condensation temperature of indoor heat exchanger, so that the refrigeration, heating capacity generated by compressor operation is close to the actual refrigeration load, heating load in the room, maximum limit reduces the fluctuation of subsequent indoor environment temperature, improves the thermal comfort of indoor environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning equipment, in particular to an air conditioner and a control method thereof for reducing indoor temperature fluctuation. BACKGROUND

[0002] The existing variable frequency air conditioner can adjust the actual output capacity of the air conditioner by adjusting the operating speed of the compressor according to the actual heat load of the indoor environment space, so as to adjust the indoor environment temperature, humidity and other parameters.

[0003] When the actual heat load of the indoor environment space is small, the compressor can stop operating, and when the indoor temperature rises by a certain value (in the cooling operation mode) or decreases by a certain value (in the heating operation mode), the compressor is restarted to operate, which may cause the compressor to operate periodically, and the indoor environment temperature also fluctuates periodically, affecting the thermal comfort of the indoor environment. SUMMARY

[0004] To solve the above problems, the first purpose of the present application is to provide a control method for reducing indoor temperature fluctuation, which can calculate the actual heat load of the indoor environment by calculating the change rate of the indoor environment temperature during the period when the air conditioner is not operating after the temperature is reached and the air conditioner is not operating for cooling or heating, so as to select the appropriate indoor heat exchanger evaporation temperature (in the cooling operation mode) or indoor heat exchanger condensation temperature (in the heating operation mode) when the air conditioner is restarted for cooling or heating operation, and control the heat exchange amount of the indoor heat exchanger by controlling the evaporation temperature or condensation temperature of the indoor heat exchanger, so as to avoid the periodic and severe fluctuation of the indoor environment temperature.

[0005] To achieve the above purpose, the present application adopts the following technical solution: a control method for reducing indoor temperature fluctuation applied to an air conditioner, the air conditioner comprising a controller, an indoor unit and an outdoor unit; the indoor unit comprising an indoor heat exchanger, an indoor heat exchanger temperature sensor, an indoor fan and an indoor environment temperature sensor; the outdoor unit comprising a compressor, a four-way reversing valve, an outdoor heat exchanger, an outdoor fan and an outdoor throttling mechanism for controlling the flow; the indoor heat exchanger and the outdoor heat exchanger form a loop through a first refrigerant linking pipeline and a second refrigerant linking pipeline, the compressor and the outdoor throttling mechanism are arranged in the loop, and the four-way reversing valve is used to switch the valve port to make the air conditioner have a cooling mode and a heating mode; characterized in that the control method comprises the following steps:

[0006] Step 1: the air conditioner is turned on, the cooling or heating mode is turned on, and the user inputs the set operating temperature Ts and the set indoor fan operating speed Rs on the controller, and the air conditioner receives the set Ts and Rs for operation;

[0007] Step 2: After the air conditioner runs for a period of time, the controller reads the current indoor environment temperature Tr collected by the indoor environment temperature sensor, and judges whether Tr and Ts satisfy condition 1, i.e. whether Tr is close to the set operating temperature Ts. If yes, the next step is entered. If no, the controller judges whether the user modifies the set temperature parameters of the air conditioner. If yes, the process returns to step 1. If no, the air conditioner continues to operate according to the set parameters.

[0008] Step 3: The controller judges whether Tr and Ts satisfy condition 2, i.e. whether Tr reaches the set operating temperature Ts. If yes, the controller controls the air conditioner to enter the temperature-reached shutdown state and records the current time of the compressor operating frequency Fs and the indoor environment temperature Trs, and the compressor stops operating. If no, the controller adjusts the speed of the indoor fan to the minimum speed Rmin.

[0009] Step 4: The operating time t of the temperature-reached shutdown state is counted. The controller judges whether the time t reaches the preset threshold α. If yes, the controller re-reads the current indoor environment temperature Tr and judges whether the compressor satisfies the start condition. If yes, the compressor is restarted and the air conditioner continues to operate according to the set parameters. If no, the operating time t of the temperature-reached shutdown state is continued to be counted. When counting t, the controller judges whether the user modifies the set temperature parameters of the air conditioner. If yes, the controller re-reads the current indoor environment temperature Tr and judges whether the compressor satisfies the start condition according to the new set temperature parameters. If yes, the compressor is restarted and the air conditioner continues to operate according to the new set parameters. If no, the counting of t is continued.

[0010] Step 5: The controller calculates the indoor environment temperature change rate ΔT during the temperature-reached shutdown state, ΔT = |Tr - Trs| / t, and clears the counting time t. Step 6 is entered.

[0011] Step 6: The controller calculates the evaporation temperature Te (in cooling operation mode) or the condensation temperature Tc (in heating operation mode) based on the values of ΔT, Ts and Rs, where Te = Ts × (1 - Cx) and Cx is a correction coefficient related to ΔT and Rs; Tc = Ts × (1 + Hx) and Hx is a correction coefficient related to ΔT and Rs. The controller controls the air conditioner to operate according to the target Te (in cooling operation mode) or Tc (in heating operation mode).

[0012] As a preferred embodiment, the indoor environment temperature change rate ΔT during the temperature-reached shutdown state gradually increases or gradually decreases, and the correction coefficients Cx and Hx also gradually increase or gradually decrease accordingly. The higher the set indoor fan operating speed Rs, the lower the correction coefficients Cx and Hx.

[0013] As a preferred embodiment, in step 2:

[0014] In the cooling mode, condition 1 is Tr-Ts≤a, a is a preset threshold value;

[0015] In the heating mode, condition 1 is Ts-Tr≤a, a is a preset threshold value.

[0016] As preferred, in step 3:

[0017] In the cooling mode, condition 2 is Tr-Ts≤b, b is a preset threshold value;

[0018] In the heating mode, condition 2 is Ts-Tr≤b, b is a preset threshold value.

[0019] As preferred, in step 4, when judging whether the compressor meets the starting condition, the condition is that Tr and Ts do not meet condition 1, or Tr and Ts meet condition 1 but do not meet condition 2.

[0020] As preferred, in step 4, when judging whether the user modifies the set temperature parameter of the air conditioner, it is necessary to judge whether the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode), if the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode), the controller re-reads the current indoor environment temperature Tr and sets the temperature parameter according to the new setting of the user, if the user does not increase the set temperature (in the cooling mode) or decrease the set temperature (in the heating mode), the air conditioner continues to operate under the previous setting.

[0021] As preferred, in step 6, it is necessary to judge whether the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode), if the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode), the user sets the value of Ts and Rs, and recalculates Te and Tc, if the user does not increase the set temperature (in the cooling mode) or decrease the set temperature (in the heating mode), the air conditioner continues to operate under the previous setting.

[0022] As preferred, the controller comprises an indoor control mechanism and an outdoor control mechanism capable of communicating with each other and respectively controlling the indoor unit and the outdoor unit.

[0023] An air conditioner applied to the control method for reducing indoor temperature fluctuation in any one of the above.

[0024] The air conditioner and the control method for reducing indoor temperature fluctuation have the following effects:

[0025] ①When the indoor environment temperature of the indoor space where the air conditioner is located and the operating temperature set by the user meet condition 1, the air conditioner can adjust the indoor fan speed to the lowest speed.

[0026] 2. When the indoor environment temperature of the indoor space where the air conditioner is located and the operating temperature set by the user satisfy condition 2, the air conditioner can enter the temperature-reached stop operation control state, and the compressor stops operating.

[0027] 3. When the air conditioner reaches the temperature-reached stop condition, the air conditioner can record the compressor operating frequency and the indoor environment temperature value at that time.

[0028] 4. When the actual environment temperature of the indoor space where the air conditioner is located and the operating temperature set by the user satisfy the compressor start condition, the compressor can start operating again.

[0029] 5. After the air conditioner enters the temperature-reached stop operation control state, the air conditioner can detect the change rate of the indoor environment temperature.

[0030] 6. When the air conditioner restarts the refrigeration or heating operation after ending the temperature-reached stop control, the air conditioner can adjust the evaporation temperature (in the refrigeration operation) or the condensation temperature (in the heating operation) of the indoor heat exchanger according to the change rate of the indoor environment temperature after the air conditioner enters the temperature-reached stop operation control state and the indoor set air speed.

[0031] Specifically, in the above scheme, during the period when the air conditioner does not operate in the refrigeration or heating mode, the actual indoor heat load is calculated by calculating the change rate of the indoor environment temperature, so that the appropriate indoor heat exchanger evaporation temperature (in the refrigeration operation) or indoor heat exchanger condensation temperature (in the heating operation) is selected when the air conditioner restarts the refrigeration or heating operation, and the heat exchange amount of the indoor heat exchanger is controlled by controlling the evaporation temperature or condensation temperature of the indoor heat exchanger, so as to avoid periodic and drastic fluctuations of the indoor environment temperature. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 The figure is a structural schematic diagram of the air conditioner involved in the present application.

[0033] Fig. 2 The figure is a control logic schematic diagram of the control method for reducing indoor temperature fluctuations involved in the present application.

[0034] Fig. 3 The figure is a condensation temperature or evaporation temperature control correction coefficient value diagram involved in the present application. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0036] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] Example one:

[0041] As Figs. 1-3The control method for reducing indoor temperature fluctuation is applied to an air conditioner, which comprises a controller, an indoor unit 10 and an outdoor unit 20; the indoor unit 10 comprises an indoor heat exchanger 101, an indoor heat exchanger temperature sensor 102, an indoor fan 103 and an indoor environment temperature sensor 105; the outdoor unit 20 comprises a compressor 201, a four-way reversing valve 202, an outdoor heat exchanger 203, an outdoor fan 204 and an outdoor throttling mechanism 205 for controlling flow; the indoor heat exchanger 101 and the outdoor heat exchanger 203 form a loop through a first refrigerant linking pipeline 30 and a second refrigerant linking pipeline 40, the compressor 201 and the outdoor throttling mechanism 205 are arranged in the loop, and the four-way reversing valve 202 is used for switching valve ports so that the air conditioner has a cooling mode and a heating mode; the control method comprises the following steps:

[0042] Step 1: the air conditioner is started, the cooling or heating mode is started, the user inputs a set operating temperature Ts and a set indoor fan operating speed Rs on the controller, and the air conditioner receives the set Ts and Rs for operation;

[0043] Step 2: after the air conditioner operates for a period of time, the controller reads the current indoor environment temperature Tr collected by the indoor environment temperature sensor 105, judges whether Tr and Ts satisfy condition 1, i.e. whether Tr is close to the set operating temperature Ts, if yes, proceeds to the next step, if not, judges whether the user modifies the set temperature parameters of the air conditioner, if yes, returns to step 1, if not, the air conditioner continues to operate according to the set parameters;

[0044] Step 3: the controller judges whether Tr and Ts satisfy condition 2, i.e. whether Tr reaches the set operating temperature Ts, if yes, the controller controls the air conditioner to enter a temperature-reached shutdown state and records the current time of the compressor operating frequency Fs and the indoor environment temperature Trs, and the compressor stops operating; if not, the controller adjusts the speed of the indoor fan to the minimum speed Rmin;

[0045] Step 4: the operating time t of the temperature-reached shutdown state is counted, and whether the time t reaches a preset threshold α is judged, if T≥α, the controller re-reads the current indoor environment temperature Tr, judges whether the compressor satisfies the opening condition, if yes, the compressor is restarted, the air conditioner continues to operate according to the set parameters, if not, the operating time t of the temperature-reached shutdown state is continued to be counted; when the t is counted, the controller judges whether the user modifies the set temperature parameters of the air conditioner, if yes, the controller re-reads the current indoor environment temperature Tr and judges whether the compressor satisfies the opening condition according to the newly set temperature parameters of the user, if yes, the compressor is restarted, the air conditioner continues to operate according to the newly set parameters, and proceeds to step 5, if not, the t is continued to be counted;

[0046] Step 5: The controller calculates the rate of change of the indoor ambient temperature △T during the temperature stoppage, △T = |Tr-Trs| / t, clears the statistical time t, and enters step 6;

[0047] Step 6: The controller calculates the evaporation temperature Te (in the cooling operation mode) or the condensation temperature Tc (in the heating operation mode) based on the values of △T, Ts, and Rs, wherein Te = Ts × (1-Cx), Cx is a correction coefficient related to △T and Rs; Tc = Ts × (1+Hx), Hx is a correction coefficient related to △T and Rs; and the controller controls the air conditioner to operate at the target Te (in the cooling operation mode) or Tc (in the heating operation mode).

[0048] Further, the rate of change of the indoor ambient temperature △T gradually increases or decreases during the temperature stoppage, and the correction coefficients Cx and Hx also gradually increase or decrease accordingly; the higher the set indoor fan operating speed Rs, the lower the correction coefficients Cx and Hx.

[0049] Further, in step 2:

[0050] In the cooling mode, condition 1 is Tr-Ts≤a, and a is a preset threshold value;

[0051] In the heating mode, condition 1 is Ts-Tr≤a, and a is a preset threshold value.

[0052] Further, in step 3:

[0053] In the cooling mode, condition 2 is Tr-Ts≤b, and b is a preset threshold value;

[0054] In the heating mode, condition 2 is Ts-Tr≤b, and b is a preset threshold value.

[0055] Further, in step 4, when judging whether the compressor meets the start condition, the condition is that Tr and Ts do not meet condition 1, or Tr and Ts meet condition 1 but do not meet condition 2.

[0056] Further, in step 4, when judging whether the user modifies the set temperature parameter of the air conditioner, it is necessary to judge whether the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode). If the user increases the set temperature (in the cooling mode) or decreases the set temperature (in the heating mode), the controller re-reads the current indoor ambient temperature Tr and operates according to the new set temperature parameter of the user. If the user does not increase the set temperature (in the cooling mode) or decrease the set temperature (in the heating mode), the air conditioner continues to operate under the previous setting.

[0057] Further, in step 6, it is determined whether the user has increased the set temperature (cooling mode) or decreased the set temperature (heating mode), if the user has increased the set temperature (cooling mode) or decreased the set temperature (heating mode), the Ts and Rs values set by the user are updated, Te and Tc are recalculated, if the user has not increased the set temperature (cooling mode) or decreased the set temperature (heating mode), the air conditioner continues to operate under the previous settings.

[0058] Further, the controller comprises an indoor control mechanism 104 and an outdoor control mechanism 206 capable of communicating with each other and controlling the indoor unit 10 and the outdoor unit 20 respectively.

[0059] In the embodiment, the control logic steps involved in the control method for reducing indoor temperature fluctuations are as follows:

[0060] Step S0: Start the program in step S0, then go to step S1;

[0061] Step S1: In step S1, the air conditioner receives the set operating temperature Ts set by the user and the indoor fan operating speed Rs set by the user, then goes to step S2;

[0062] Step S2: In step S2, the air conditioner operates in the operating state set by the user, then goes to step S3;

[0063] Step S3: In step S3, the air conditioner operates in the current state, then goes to step S4;

[0064] Step S4: In step S4, read the indoor environment temperature information Tr collected by the indoor environment temperature sensor 105, then go to step S5;

[0065] Step S5: In step S5, it is determined whether the air conditioner has received a shutdown signal, if the air conditioner has received a shutdown signal, go to step S27, otherwise go to step S6;

[0066] Step S6: In step S6, it is determined whether Tr and Ts satisfy condition 1, if Tr and Ts satisfy condition 1, go to step S8, otherwise go to step S7;

[0067] In cooling mode, condition 1 is Tr-Ts≤a, a is a preset threshold, for example, a is preset to 1℃;

[0068] In heating mode, condition 1 is Ts-Tr≤a, a is a preset threshold, for example, a is preset to 1.5℃;

[0069] Step S7: In step S7, it is judged whether the user modifies the set temperature parameter of the air conditioner, if the user modifies the set temperature parameter, step S1 is entered, otherwise, step S3 is entered;

[0070] Step S8: In step S8, it is judged whether Tr, Ts satisfies condition 2, if Tr, Ts satisfies condition 2, step S10 is entered, otherwise, step S9 is entered;

[0071] In the cooling mode, condition 2 is Tr-Ts≤b, b is a preset threshold, for example, b is preset as -1℃;

[0072] In the heating mode, condition 2 is Ts-Tr≤b, b is a preset threshold, for example, b is preset as -1.5℃;

[0073] Step S9: In step S9, the speed of the indoor fan is adjusted, the speed of the indoor fan is adjusted to the minimum speed Rmin, and then step S7 is entered;

[0074] Step S10: In step S10, the unit operates in the temperature-reached stop state, the compressor stops operating, and then step S11 is entered;

[0075] Step S11: In step S11, the operation time t of the temperature-reached stop state is counted, and then step S12 is entered;

[0076] Step S12: In step S12, it is judged whether the time t reaches a preset threshold α (for example, α is preset as 3min), if t≥α, step S13 is entered, otherwise, step S11 is returned;

[0077] Step S13: In step S13, it is judged whether the user modifies the set temperature parameter of the air conditioner, if the user modifies the set temperature parameter, step S14 is entered, otherwise, step S15 is entered;

[0078] Step S14: In step S14, it is judged whether the user raises the set temperature (in the cooling mode) or lowers the set temperature (in the heating mode), if the user raises the set temperature (in the cooling mode) or lowers the set temperature (in the heating mode), step S19 is entered, otherwise, step S2 is entered;

[0079] Step S15: In step S15, the indoor environment temperature information Tr collected by the indoor environment temperature sensor 105 is read, and then step S16 is entered;

[0080] Step S16: In step S16, it is judged whether the compressor satisfies the start condition, if the compressor satisfies the start condition, step S2 is entered, otherwise, step S17 is entered;

[0081] Step S17: In step S17, the running time t of the temperature-reached stoppage state is continued to be counted, and then step S18 is entered;

[0082] Step S18: In step S18, it is judged whether the user modifies the set temperature parameter of the air conditioner, if the user modifies the set temperature parameter, step S14 is entered, otherwise step S19 is entered;

[0083] Step S19: In step S19, the indoor environment temperature information Tr collected by the indoor environment temperature sensor 105 is read, and then step S20 is entered;

[0084] Step S20: In step S20, it is judged whether the compressor satisfies the starting condition, if the compressor satisfies the starting condition, step S21 is entered, otherwise step S17 is entered;

[0085] Step S21: In step S21, the indoor environment temperature change rate AT during the temperature-reached stoppage is calculated, AT = |Tr - Trs| / t, the counting time t is cleared, and then step S22 is entered;

[0086] Step S22: In step S22, the appropriate evaporation temperature Te (in the cooling running mode) or condensation temperature Tc (in the heating running mode) is selected according to AT, Ts and Rs, and then step S23 is entered;

[0087] Te = Ts x (1 - Cx), Cx is a correction coefficient, the reference parameter of the value of which is shown in Table 1, and the value of which is related to AT and Rs; Fig. 3

[0088] Tc = Ts x (1 + Hx), Hx is a correction coefficient, the reference parameter of the value of which is shown in Table 2, and the value of which is related to AT and Rs; Fig. 3

[0089] Step S23: In step S23, the running state of the air conditioner is controlled according to the target Te (in the cooling running mode) or Tc (in the heating running mode);

[0090] Step S24: In step S24, it is judged whether the air conditioner receives a shutdown signal, if the air conditioner receives the shutdown signal, step S27 is entered, otherwise step S25 is entered;

[0091] Step S25: In step S25, it is judged whether the user of the air conditioner adjusts the set temperature (in the cooling mode) or the set temperature (in the heating mode), if the user adjusts the set temperature (in the cooling mode) or the set temperature (in the heating mode), step S26 is entered, otherwise step S2 is entered;

[0092] ​​Step S26: In step S26, update the Ts and Rs data set by the user, and then proceed to step S22;

[0093] Step S27: In step S27, the air conditioner is turned off, and the program ends.

[0094] In this specific embodiment, a control method for reducing indoor temperature fluctuations can detect the rate of change of indoor ambient temperature, determine the actual indoor heat load, and select an appropriate indoor heat exchanger evaporation temperature (during cooling operation) or indoor heat exchanger condensation temperature (during heating operation) when the compressor restarts cooling or heating operation. By controlling the evaporation or condensation temperature of the indoor heat exchanger, the heat exchange capacity of the indoor heat exchanger is controlled, so that the cooling and heating capacity generated by the compressor operation is close to the actual indoor cooling and heating load, thereby minimizing subsequent fluctuations in indoor ambient temperature and improving the thermal comfort of the indoor environment.

[0095] Example 2:

[0096] like Fig. 1 An air conditioner is shown, which is applied to a control method for reducing indoor temperature fluctuations in Embodiment 1.

[0097] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A control method for reducing indoor temperature fluctuations, applied to an air conditioner, the air conditioner including a controller, an indoor unit (10) and an outdoor unit (20); the indoor unit (10) includes an indoor heat exchanger (101), an indoor heat exchanger temperature sensor (102), an indoor fan (103) and an indoor ambient temperature sensor (105); the outdoor unit (20) includes a compressor (201), a four-way reversing valve (202), an outdoor heat exchanger (203), an outdoor fan (204) and an outdoor throttling mechanism (205) for controlling flow; the indoor heat exchanger (101) and the outdoor heat exchanger (203) form a circuit through a first refrigerant connection pipe (30) and a second refrigerant connection pipe (40), the compressor (201) and the outdoor throttling mechanism (205) are disposed in the above circuit, and the four-way reversing valve (202) is used to switch the valve port so that the air conditioner has a cooling mode and a heating mode; characterized in that: The control method comprises the following steps: Step 1: Turn on the air conditioner and turn on either cooling or heating mode. The user inputs the set operating temperature Ts and the set indoor fan speed Rs on the controller. The air conditioner receives the set Ts and Rs and operates accordingly. Step 2: After the air conditioner has been running for a period of time, the controller reads the current indoor ambient temperature Tr collected by the indoor ambient temperature sensor (105). In the cooling mode, condition 1 is Tr-Ts≤a, and in the heating mode, condition 1 is Ts-Tr≤a, where a is a preset threshold. The controller judges whether Tr and Ts meet condition 1, that is, whether Tr is close to the set operating temperature Ts. If it meets the condition, the controller proceeds to the next step. If it does not meet the condition, the controller judges whether the user has modified the set temperature parameter of the air conditioner. If the judgment is yes, the controller returns to step 1. If the judgment is no, the air conditioner continues to operate according to the setting. Step 3: In cooling mode, condition 2 is Tr-Ts≤b, and in heating mode, condition 2 is Ts-Tr≤b, where b is a preset threshold. The controller determines whether Tr and Ts meet condition 2, i.e., whether Tr reaches the set operating temperature Ts. If it does, the controller controls the air conditioner to enter the temperature-reaching shutdown state and records the compressor operating frequency Fs and the indoor ambient temperature Trs at the current moment, and the compressor stops running. If it does not meet the condition, the controller adjusts the indoor fan speed to the minimum speed Rmin. Step 4: Calculate the operating time t of the temperature-reaching shutdown state. Determine if time t reaches the preset threshold α. If T≥α, the controller rereads the current indoor ambient temperature Tr. In cooling mode, the start condition is Tr-Ts>b, and in heating mode, it is Ts-Tr>b, where b is the preset threshold. Determine if the compressor meets the start condition. If it does, the compressor restarts, and the air conditioner continues to operate according to the settings. If not, continue calculating the operating time t of the temperature-reaching shutdown state. While calculating t, the controller checks if the user has modified the air conditioner's set temperature parameters. If so, the controller rereads the current indoor ambient temperature Tr and, based on the user's new temperature setting, checks if the compressor meets the start condition. If so, the compressor restarts, and the air conditioner continues to operate according to the new settings, proceeding to Step 5. Otherwise, continue calculating t. Step 5: The controller calculates the rate of change of indoor ambient temperature ΔT during the temperature-reaching shutdown period, ΔT=|Tr-Trs| / t, clears the statistical time t, and proceeds to step 6; Step 6: The controller calculates the evaporation temperature Te in cooling mode or the condensation temperature Tc in heating mode based on the values ​​of ΔT, Ts, and Rs. Te = Ts × (1 - Cx), where Cx is a correction coefficient and its value is related to ΔT and Rs; Tc = Ts × (1 + Hx), where Hx is a correction coefficient and its value is related to ΔT and Rs. The controller controls the air conditioner to operate according to the target Te in cooling mode or according to the target Tc in heating mode.

2. The control method for reducing indoor temperature fluctuations according to claim 1, characterized in that: During the temperature-controlled shutdown period, the rate of change of indoor ambient temperature ΔT gradually increases or decreases, and the correction coefficients Cx and Hx also gradually increase or decrease accordingly; the higher the set indoor fan operating speed Rs, the lower the correction coefficients Cx and Hx.

3. The control method for reducing indoor temperature fluctuations according to claim 1, characterized in that: In step 4, when determining whether the compressor meets the start-up conditions, the conditions are: Tr and Ts do not meet condition 1, or Tr and Ts meet condition 1 but do not meet condition 2.

4. The control method for reducing indoor temperature fluctuations according to claim 3, characterized in that: In step 4, when determining whether the user has modified the air conditioner's set temperature parameter, it is necessary to determine whether the user has increased the set temperature in cooling mode or decreased the set temperature in heating mode. If the user has increased the set temperature in cooling mode or decreased the set temperature in heating mode, the controller will reread the current indoor ambient temperature Tr and adjust the temperature parameter according to the user's new setting. If the user has not increased the set temperature in cooling mode or decreased the set temperature in heating mode, the air conditioner will continue to operate under the previous setting.

5. The control method for reducing indoor temperature fluctuations according to claim 1, characterized in that: In step 6, it is necessary to determine whether the user increases the set temperature in cooling mode or decreases the set temperature in heating mode. If the user increases the set temperature in cooling mode or decreases the set temperature in heating mode, the user-set Ts and Rs values ​​are updated, and Te and Tc are recalculated. If the user does not increase the set temperature in cooling mode or decrease the set temperature in heating mode, the air conditioner continues to operate under the previous settings.

6. The control method for reducing indoor temperature fluctuations according to claim 5, characterized in that: The controller includes an indoor control mechanism (104) and an outdoor control mechanism (206) that are capable of communicating with each other and controlling the indoor unit (10) and the outdoor unit (20) respectively.

7. An air conditioner, characterized in that: The control method for reducing indoor temperature fluctuations described in any one of claims 1 to 6 above is applicable.

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