Control method and control system

Abstract

The invention provides a control method and a control system. The control method comprises the steps that the operation mode of an air conditioner system in an air conditioner water heating mode, the initial target operation frequency of a compressor in a single air conditioner mode corresponding to the air conditioner water heating mode and the water storage capacity of a water tank are obtained; according to the operation mode of the air conditioner system in the air conditioner water heating mode and the water storage capacity of the water tank, the correction frequency of the compressor is determined to obtain the actual target operation frequency of the compressor; and controlling a compressor to operate at the actual target operation frequency, or comparing the actual operation frequency of the compressor with the actual target operation frequency, and regulating and controlling the operation mode of the air conditioning system according to the comparison result of the actual operation frequency and the actual target operation frequency. According to the technical scheme, the technical problem that in the prior art, a heat pump air conditioner cannot adaptively adjust the operation frequency of the compressor when the water tank is heated can be solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and more specifically, to a control method and a control system. Background Technology

[0002] Currently, heat pump air conditioners can achieve both cooling and heating, while heat pump water heaters can produce hot water. During the summer cooling cycle, air conditioners release a large amount of condensation waste heat outdoors, which can be utilized to produce hot water. By combining an outdoor unit, an indoor unit, and a water tank, multiple operating modes can be achieved, including air conditioning cooling, air conditioning heating, hot water production by a water heater, and heat recovery.

[0003] However, existing air source heat pump water heater systems (one-to-two) generally have fixed system configurations, operating at the corresponding compressor frequency when heating the air or when cooling the air, and cannot adaptively adjust the compressor operating frequency according to the heating situation of the water tank. Summary of the Invention

[0004] The main objective of this invention is to provide a control method and control system to solve the technical problem that existing heat pump air conditioners cannot adaptively adjust the operating frequency of the compressor when heating the water tank.

[0005] To achieve the above objectives, the present invention provides a control method adapted to an air conditioning system. The air conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, and a water tank heat exchanger. The air conditioning system has a water tank heating mode for heating the water tank via the water tank heat exchanger and a single air conditioning mode for separately regulating indoor air. The water tank heating mode includes an air conditioning water heating mode that heats the water tank and regulates the indoor air. The control method includes:

[0006] The system obtains the operating mode of the air conditioning system in the air conditioning water heating mode, the initial target operating frequency of the compressor in the single air conditioning mode corresponding to the air conditioning water heating mode, and the water storage capacity of the water tank.

[0007] The correction frequency of the compressor is determined based on the operating mode of the air conditioning system in the air conditioning water heating mode and the water storage capacity of the water tank, and the initial target operating frequency is corrected using the correction frequency to obtain the actual target operating frequency of the compressor.

[0008] The compressor is controlled to operate at the actual target operating frequency; or, the actual operating frequency of the compressor is compared with the actual target operating frequency, and the operating mode of the air conditioning system is adjusted according to the comparison result.

[0009] Further, the air conditioning water heating mode includes a cooling heat recovery mode that cools indoor air and heats the water tank, and a hot air / hot water mode that heats the water tank and heats indoor air; the step of determining the compressor's correction frequency based on the air conditioning system's operating mode in the air conditioning water heating mode and the water tank's storage capacity, and using the correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes:

[0010] When the air conditioning system is in the cooling and heat recovery mode, the water storage capacity of the water tank is used to determine whether it is compatible with the initial target operating frequency of the compressor, and whether the initial target operating frequency needs to be corrected.

[0011] When the air conditioning system is in the hot air and hot water mode, the correction frequency is the target frequency of the water heater that heats the water tank, and the actual target operating frequency is the sum of the initial target operating frequency and the correction frequency.

[0012] Furthermore, the air conditioning water heating mode includes a cooling heat recovery mode that cools indoor air and heats the water tank; the step of determining the compressor's correction frequency based on the air conditioning system's operating mode in the air conditioning water heating mode and the water tank's storage capacity, and using the correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes:

[0013] When the air conditioning system is in the cooling and heat recovery mode, determine whether the initial target operating frequency of the compressor is compatible with the water storage capacity of the water tank;

[0014] When the water storage capacity of the water tank is compatible with the initial target operating frequency of the compressor, the actual target operating frequency of the compressor is determined to be the initial target operating frequency of the compressor.

[0015] If the water storage capacity of the water tank is not compatible with the initial target operating frequency of the compressor, the corrected frequency of the compressor is calculated based on the water storage capacity of the water tank.

[0016] Furthermore, the water tank heating mode also includes a heat pump water heating mode that heats the water tank but does not cool or heat the indoor air; the calculation of the correction frequency based on the water tank's storage capacity includes:

[0017] Obtain the maximum heating capacity of the air conditioning system in the heat pump hot water mode, and calculate the maximum suitable water storage capacity V0 corresponding to the maximum heating capacity based on the maximum heating capacity.

[0018] The corrected frequency k is calculated based on V1 / V0=k / F0;

[0019] Wherein, V1 is the water storage capacity of the water tank, and F0 is the operating frequency of the compressor corresponding to the maximum heating capacity.

[0020] Further, the step of correcting the initial target operating frequency of the compressor using the corrected frequency to obtain the actual target operating frequency includes:

[0021] Compare the magnitude of the corrected frequency k with the initial target operating frequency of the compressor;

[0022] When the correction frequency k is less than or equal to the initial target operating frequency, the actual target operating frequency is made equal to the correction frequency k.

[0023] When the correction frequency k is greater than the initial target operating frequency, the actual target operating frequency is made equal to the initial target operating frequency.

[0024] Furthermore, the water tank heating mode includes a cooling heat recovery mode for both indoor air cooling and water tank heating. The cooling heat recovery mode includes: a partial heat recovery mode where both the outdoor heat exchanger and the water tank heat exchanger are in a condensation and heat release state; and a full heat recovery mode where the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensation and heat release state. The control method further includes:

[0025] Under the aforementioned cooling and heat recovery mode;

[0026] The actual operating frequency fc of the compressor is compared with the actual target operating frequency Fc(k);

[0027] The air conditioning system is determined to switch to either the full heat recovery mode or the partial heat recovery mode based on the comparison between the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k).

[0028] Further, determining whether the air conditioning system switches to the full heat recovery mode or the partial heat recovery mode based on the comparison result between the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k) includes:

[0029] When the air conditioning system activates the cooling and heat recovery mode; when fc≤Fc(k)-δf0, the air conditioning system is controlled to enter the full heat recovery mode; when fc>Fc(k)-δf0, the air conditioning system is controlled to enter the partial heat recovery mode.

[0030] After entering the full heat recovery mode; when fc≥Fc(k), control the air conditioning system to switch to the partial heat recovery mode; when fc<Fc(k), control the air conditioning system to continue in the full heat recovery mode;

[0031] After entering the partial heat recovery mode; when fc≥Fc(k), the air conditioning system is controlled to continue in the partial heat recovery mode; when fc<Fc(k), the air conditioning system is controlled to switch to the full heat recovery mode.

[0032] δf0 is the allowable error value.

[0033] Furthermore, the water tank heating mode includes a heat pump water heating mode that heats the water tank but does not cool or heat the indoor air; the control method further includes:

[0034] The corrected frequency is calculated based on the capacity of the water tank, and the compressor operates at the corrected frequency.

[0035] Furthermore, the single air conditioning system has an air conditioning mode that does not heat the water tank, the air conditioning mode including a single heating mode and a single cooling mode; the water tank heating mode includes a heat pump hot water mode that heats the water tank but does not cool or heat the indoor air; the control method further includes:

[0036] The air conditioning system is controlled to start the hot air and hot water mode, and the actual operating frequency fh of the compressor is controlled to run at the actual target operating frequency Fh(z);

[0037] Wherein, the actual target operating frequency Fh(z) is equal to the sum of the initial target operating frequency Fk of the air conditioning system when operating in the single heating mode and the compressor frequency z when heating the water tank using the heat pump hot water mode alone.

[0038] Furthermore, after controlling the compressor to operate at the actual target operating frequency Fh(z), the control method further includes:

[0039] The actual operating frequency fh of the compressor is compared with the upper limit frequency Fx of the air conditioning system operating in the heating mode;

[0040] Based on the comparison between the actual operating frequency fh of the compressor and the upper limit frequency Fx of the air conditioning system operating in the heating mode, it is determined whether the air conditioning system should switch to the heating mode or continue to operate in the hot air / hot water mode.

[0041] Further, determining whether the air conditioning system should switch to the heating mode or continue operating in the hot air / hot water mode based on the comparison result between the actual operating frequency fh of the compressor and the upper limit frequency Fx of the air conditioning system operating in the heating mode includes:

[0042] When the air conditioning system is in the hot air / hot water mode; when fh≤Fx-δf1, the air conditioning system is controlled to continue in the hot air / hot water mode; when fh>Fx-δf1, the air conditioning system is controlled to switch to the heating mode.

[0043] After entering the hot air and hot water mode; when fh≥Fx, control the air conditioning system to switch to the heating mode; when fh<Fh(z), control the air conditioning system to continue in the hot air and hot water mode;

[0044] After entering the heating mode; when fh≤Fx-δf1, control the air conditioning system to switch to the hot air / hot water mode; when fh>Fx-δf1, control the air conditioning system to continue in the heating mode;

[0045] δf1 is the allowable error value.

[0046] Furthermore, after entering the heating mode, the control method further includes:

[0047] Acquire signals indicating whether the user is using hot water and whether the hot water temperature meets the user's set temperature;

[0048] If a signal is received indicating that the user is using hot water and the hot water temperature does not meet the user's set temperature, the air conditioning system is controlled to switch to the hot air and hot water mode.

[0049] Furthermore, the control method further includes:

[0050] Obtain the operating status of the air conditioning system and the water temperature of the water tank;

[0051] When the air conditioning system is in cooling mode; when the water temperature in the water tank is less than or equal to a first preset temperature, the air conditioning system is controlled to heat the water tank; when the water temperature in the water tank is greater than or equal to a second preset temperature, the air conditioning system is controlled to exit the mode of heating the water tank.

[0052] The second preset temperature is the water temperature set by the user, and the first preset temperature is lower than the second preset temperature.

[0053] Furthermore, the control method further includes:

[0054] The system controls the air conditioning system to start cooling and heating the water tank, and switches the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank.

[0055] Furthermore, the water tank heating mode includes a heat recovery mode in which both indoor heat exchangers are in an evaporative heat absorption state. The heat recovery mode includes: a partial heat recovery mode in which both the outdoor heat exchanger and the water tank heat exchanger are in a condensing heat release state; and a full heat recovery mode in which the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensing heat release state. The water tank heating mode also includes a heat pump hot water mode in which the outdoor heat exchanger is in an evaporative heat absorption state, the indoor heat exchanger is stopped, and the water tank heat exchanger is in a condensing heat release state. Switching the operating mode of the air conditioning system based on the indoor environment Ta and / or the water temperature Tc of the water tank includes:

[0056] When Ta≥T1+δTa, Tc≤T4-δTc, the air conditioning system is controlled to be in the full heat recovery mode;

[0057] When Ta≥T1+δTa, the air conditioning system is controlled to be in cooling operation mode;

[0058] When Tc≤T4-δTc, the air conditioning system is controlled to be in the heat pump hot water mode;

[0059] When Ta≤T1, the air conditioning system is controlled to stop cooling;

[0060] When Tc≥T4, the air conditioning system is controlled to stop heating the water tank.

[0061] Furthermore, the control method further includes:

[0062] The system controls the air conditioning system to start heating and heat the water tank, and switches the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank.

[0063] Furthermore, the water tank heating modes include a cooling heat recovery mode that cools indoor air and heats the water tank, a heat pump hot water mode that heats the water tank but does not cool or heat indoor air, and a hot air hot water mode that heats the water tank and heats indoor air; the control method further includes:

[0064] When Ta≤T2-δTb and Tc≤T3-δTc, the air conditioning system is controlled to operate in the hot air and hot water mode;

[0065] When Ta≤T2-δTb, the air conditioning system is controlled to operate in a single heating mode that heats the air but not the water tank.

[0066] When Tc≤T3-δTc, the air conditioning system is controlled to operate in the heat pump hot water mode;

[0067] When Ta ≥ T2, the air conditioning system stops heating;

[0068] When Tc≥T3, the air conditioning system stops heating the water tank.

[0069] According to another aspect of the present invention, an air conditioning system is provided, employing the control method provided above, the air conditioning system comprising:

[0070] Indoor heat exchange branch, including indoor heat exchange pipeline and indoor heat exchanger installed on the indoor heat exchange pipeline;

[0071] An outdoor heat exchange branch includes an outdoor heat exchange pipeline and an outdoor heat exchanger installed on the outdoor heat exchange pipeline.

[0072] The water tank heat exchange branch includes a heating pipe and a water tank installed on the heating pipe;

[0073] A compression branch includes a compression pipeline and a compressor disposed on the compression pipeline;

[0074] At least two of the indoor heat exchange branch, the outdoor heat exchange branch, and the water tank heat exchange branch are connected to the compression branch to form a heat exchange loop.

[0075] Furthermore, one end of the water tank heat exchange branch can be selectively connected to or disconnected from the compressor's exhaust port, and the other end of the water tank heat exchange branch can be selectively connected to one end of the indoor heat exchange branch and / or one end of the outdoor heat exchange branch. The other end of the indoor heat exchange branch can be selectively connected to the compressor's suction port or the exhaust port, and the other end of the outdoor heat exchange branch can be selectively connected to the compressor's suction port or the exhaust port.

[0076] Furthermore, the air conditioning system also includes:

[0077] A four-way valve and a first solenoid valve, wherein the four-way valve has four connecting ports including a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port; the exhaust port is selectively connected to or disconnected from the first connecting port; the intake port is connected to the third connecting port; the second connecting port is selectively connected to or disconnected from the other end of the outdoor heat exchange branch; and the fourth connecting port is selectively connected to or disconnected from the indoor heat exchange branch; the first solenoid valve is disposed on the pipeline connecting the exhaust port and the first connecting port; and / or,

[0078] A second solenoid valve is installed on the heat exchange branch of the water tank; and / or,

[0079] The third solenoid valve is installed on the outdoor heat exchange branch.

[0080] By applying the technical solution of this invention, the air conditioning system can achieve both cooling and heating, and can also produce hot water. During summer cooling, the outdoor unit releases a large amount of condensation waste heat, which can be utilized to produce hot water. Through a combination of an outdoor unit, an indoor unit, and a water tank, multiple operating modes can be achieved, including air conditioning cooling, air conditioning heating, hot water production, and heat recovery. This solves the technical problem of existing air source heat pump water heater systems (one-to-two), where the system configuration is generally fixed, making it difficult for residential users to flexibly match suitable water tank specifications. Attached Figure Description

[0081] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0082] Figure 1 A flowchart illustrating a control method provided according to an embodiment of the present invention is shown;

[0083] Figure 2 A schematic diagram of the control flow of a water tank heating mode provided according to an embodiment of the present invention is shown;

[0084] Figure 3 A schematic diagram of the control flow of a hot air hot water mode according to an embodiment of the present invention is shown;

[0085] Figure 4 A schematic diagram of the control flow for refrigeration start-up according to an embodiment of the present invention is shown;

[0086] Figure 5 A schematic diagram of the control flow for heating start-up according to an embodiment of the present invention is shown;

[0087] Figure 6 A schematic diagram of the control flow for starting up heating and hot water production according to an embodiment of the present invention is shown;

[0088] Figure 7 A schematic diagram of the control flow for starting up a cooling and hot water system according to an embodiment of the present invention is shown.

[0089] Figure 8 A schematic diagram of the control flow for starting up a heat pump for hot water production according to an embodiment of the present invention is shown;

[0090] Figure 9 A schematic diagram of an air conditioning system according to an embodiment of the present invention is shown.

[0091] The above figures include the following reference numerals:

[0092] 11. Indoor heat exchange piping; 12. Indoor heat exchanger;

[0093] 21. Outdoor heat exchange piping; 22. Outdoor heat exchanger;

[0094] 31. Heating pipes; 32. Water tank heat exchanger;

[0095] 41. Compression piping; 42. Compressor;

[0096] 50. Four-way valve;

[0097] 61. First solenoid valve; 62. Second solenoid valve; 63. Third solenoid valve;

[0098] 71. First electronic expansion valve; 72. Second electronic expansion valve. Detailed Implementation

[0099] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0100] like Figures 1 to 8 As shown, Embodiment 1 of the present invention provides a control method adapted to an air conditioning system. The air conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, and a water tank heat exchanger. The air conditioning system has a water tank heating mode for heating the water tank through the water tank heat exchanger and a single air conditioning mode for separately regulating indoor air. The water tank heating mode includes an air conditioning water heating mode for heating the water tank and regulating indoor air. The control method includes: acquiring the operating mode of the air conditioning system in the air conditioning water heating mode, the initial target operating frequency of the compressor in the single air conditioning mode corresponding to the air conditioning water heating mode, and the water storage capacity of the water tank; determining the correction frequency of the compressor based on the operating mode of the air conditioning system in the air conditioning water heating mode and the water storage capacity of the water tank, and using the correction frequency to correct the initial target operating frequency to obtain the actual target operating frequency of the compressor; controlling the compressor to operate at the actual target operating frequency; or, comparing the actual operating frequency of the compressor with the actual target operating frequency, and adjusting the operating mode of the air conditioning system based on the comparison result of the actual operating frequency and the actual target operating frequency.

[0101] By adopting the technical solution provided in this embodiment, the actual target operating frequency of the compressor can be adaptively adjusted according to the water storage capacity of the water tank, so that the operating frequency of the compressor can adapt to the situation of cooling heating the water tank, heating the water tank, and heat pump hot water heating. This optimizes the compatibility between the compressor and the water tank, improves the overall operating efficiency, and can effectively meet the heating needs of the water tank and the normal heating operation of the air conditioner.

[0102] Furthermore, in actual use, the specifications of the water tank can be flexibly adjusted and the water tank can be replaced. After the water tank is replaced, only the water storage capacity of the water tank needs to be adjusted accordingly to achieve synchronous adjustment of the compressor.

[0103] It should be noted that the air conditioning water heating mode includes a cooling and heat recovery mode that cools the indoor air and heats the water tank, and a hot air / hot water mode that heats the water tank and heats the indoor air. When the air conditioning system operates in cooling and heat recovery mode under air conditioning water heating mode, the corresponding single air conditioning mode is a single cooling mode that only cools the air; when the air conditioning system operates in hot air / hot water mode under air conditioning water heating mode, the corresponding single air conditioning mode is a single heating mode that only heats the air.

[0104] Correspondingly, "the initial target operating frequency of the compressor in the single air conditioning mode corresponding to the air conditioning water heating mode" is understood as the initial target operating frequency of the air conditioner in the single heating mode or single cooling mode. This initial target operating frequency does not take into account the impact of the heating water demand on the normal operation of the overall air conditioning system.

[0105] In this embodiment, the air conditioning water heating mode includes a cooling heat recovery mode that cools indoor air and heats the water tank, and a hot air hot water mode that heats the water tank and heats indoor air. The step of determining the compressor's correction frequency based on the air conditioning system's operating mode for air conditioning water heating and the water tank's storage capacity, and using the correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes: when the air conditioning system is in the cooling heat recovery mode, determining whether the water tank's storage capacity matches the compressor's initial target operating frequency to determine whether to correct the initial target operating frequency; when the air conditioning system is in the heat pump hot water mode, using the target frequency of the water heater that heats the water tank as the initial target operating frequency, determining the correction frequency as 0, and operating at the actual target operating frequency; when the air conditioning system is in the hot air hot water mode, the correction frequency is the target frequency of the water heater that heats the water tank, and the actual target operating frequency is the sum of the initial target operating frequency and the correction frequency. This allows for the determination of the correction amount based on different water tank heating modes, facilitating the correction of the initial target operating frequency. This ensures that the actual target operating frequency is better matched with the water tank heating and the air conditioner's cooling or heating functions, thereby improving the overall operating effect and meeting user needs.

[0106] Specifically, the water tank heating mode also includes a heat pump water heating mode that heats the water tank but does not cool or heat the indoor air.

[0107] Specifically, the air conditioning water heating mode includes a cooling and heat recovery mode that cools indoor air and heats the water tank. The step of determining the compressor's correction frequency based on the air conditioning system's operating mode in the air conditioning water heating mode and the water tank's storage capacity, and then using this correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes: when the air conditioning system is in the cooling and heat recovery mode, determining whether the compressor's initial target operating frequency matches the water tank's storage capacity; if the water tank's storage capacity matches the compressor's initial target operating frequency, determining the compressor's actual target operating frequency as the compressor's initial target operating frequency; if the water tank's storage capacity does not match the compressor's initial target operating frequency, calculating the compressor's correction frequency based on the water tank's storage capacity. This method facilitates adjustments to the actual target operating frequency in cooling mode based on the water tank's storage capacity, enabling the compressor to effectively consider both cooling and water tank storage, ensuring both cooling and water tank heating effects.

[0108] Specifically, the water tank heating mode also includes a heat pump hot water mode that heats the water tank but does not cool or heat the indoor air. The air conditioning system has an air conditioning mode that does not heat the water tank, including a single heating mode and a single cooling mode. Calculating the correction frequency based on the water tank's storage capacity includes: obtaining the maximum heating capacity of the air conditioning system in the heat pump hot water mode; calculating the maximum suitable water storage capacity V0 corresponding to the maximum heating capacity; and calculating the correction frequency k according to V1 / V0 = k / F0; where V1 is the water tank's storage capacity and F0 is the compressor's operating frequency corresponding to the maximum heating capacity. This facilitates a more accurate determination of the compressor's actual target operating frequency, thereby improving control precision and enabling a more accurate calculation of the compressor's actual target operating frequency.

[0109] In this embodiment, correcting the initial target operating frequency of the compressor using the correction frequency to obtain the actual target operating frequency includes: comparing the magnitude of the correction frequency k with the initial target operating frequency of the compressor; when the correction frequency k is less than or equal to the initial target operating frequency, setting the actual target operating frequency equal to the correction frequency k; when the correction frequency k is greater than the initial target operating frequency, setting the actual target operating frequency equal to the initial target operating frequency. This method facilitates accurate determination of the corresponding actual target operating frequency based on the water tank's storage capacity and the correction frequency, and also facilitates energy conservation and emission reduction.

[0110] Specifically, the water tank heating mode includes a cooling and heat recovery mode for both indoor air cooling and water tank heating. The cooling and heat recovery mode includes: a partial heat recovery mode where both the outdoor heat exchanger and the water tank heat exchanger are in a condensing and releasing heat state; and a full heat recovery mode where the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensing and releasing heat state. The control method further includes: when in the cooling and heat recovery mode; comparing the actual operating frequency fc of the compressor with the actual target operating frequency Fc(k); and determining whether the air conditioning system switches to the full heat recovery mode or the partial heat recovery mode based on the comparison result of the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k). This is to better meet the user's hot water or air cooling needs, effectively utilize energy, and avoid energy waste.

[0111] In this embodiment, determining whether the air conditioning system switches to the full heat recovery mode or the partial heat recovery mode based on the comparison result of the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k) includes: when the air conditioning system starts the cooling heat recovery mode; when fc≤Fc(k)-δf0, controlling the air conditioning system to enter the full heat recovery mode; when fc>Fc(k)-δf0, controlling the air conditioning system to enter the partial heat recovery mode; after entering the full heat recovery mode; when fc≥Fc(k), controlling the air conditioning system to switch to the partial heat recovery mode; when fc<Fc(k), controlling the air conditioning system to continue in the full heat recovery mode; after entering the partial heat recovery mode; when fc≥Fc(k), controlling the air conditioning system to continue in the partial heat recovery mode; when fc<Fc(k), controlling the air conditioning system to switch to the full heat recovery mode; where δf0 is an allowable error value. This facilitates accurate determination of whether the system enters full heat recovery or partial heat recovery mode, thus improving the accuracy of the judgment.

[0112] Specifically, the water tank heating mode includes a heat pump hot water mode that heats the water tank but does not cool or heat the indoor air; the control method further includes: calculating a corrected frequency based on the capacity of the water tank, and causing the compressor to operate at the corrected frequency. This can also be understood as: in this mode, the actual target operating frequency Fs(m) of the air conditioning system is equal to the corrected frequency fs. This facilitates improved accuracy in water tank heating to meet customer needs.

[0113] In this embodiment, the air conditioning system has an air conditioning mode that does not heat the water tank, including a single heating mode and a single cooling mode; the water tank heating modes include a cooling heat recovery mode that cools indoor air and heats the water tank, a heat pump hot water mode that heats the water tank but does not cool or heat indoor air, and a hot air hot water mode that heats the water tank and heats indoor air; the control method further includes: controlling the air conditioning system to start the hot air hot water mode, and controlling the actual operating frequency fh of the compressor to operate at the actual target operating frequency Fh(z); wherein, the actual target operating frequency Fh(z) is equal to the sum of the target operating frequency Fk of the air conditioning system when operating in the single heating mode and the compressor frequency z that needs to be increased when heating the water tank using the heat pump hot water mode. This ensures that the hot air hot water heating mode is effectively satisfied.

[0114] Specifically, after controlling the compressor to operate at the actual target operating frequency Fh(z) at its actual operating frequency fh, the control method further includes: comparing the compressor's actual operating frequency fh with the upper limit frequency Fx of the air conditioning system operating in the heating mode; and determining whether the air conditioning system should switch to the heating mode or continue operating in the hot air / hot water mode based on the comparison result between the compressor's actual operating frequency fh and the upper limit frequency Fx of the air conditioning system operating in the heating mode. This facilitates accurate judgment of the switching between the two modes to flexibly meet different usage needs.

[0115] In this embodiment, determining whether the air conditioning system should switch to the heating mode or continue operating in the hot air / hot water mode based on the comparison result between the actual operating frequency fh of the compressor and the upper limit frequency Fx of the air conditioning system operating in the heating mode includes: when the air conditioning system starts the hot air / hot water mode; when fh ≤ Fx - δf1, controlling the air conditioning system to continue in the hot air / hot water mode; when fh > Fx - δf1, controlling the air conditioning system to switch to the heating mode; after entering the hot air / hot water mode; when fh ≥ Fx, controlling the air conditioning system to switch to the heating mode; when fh < Fh(z), controlling the air conditioning system to continue in the hot air / hot water mode; after entering the heating mode; when fh ≤ Fx - δf1, controlling the air conditioning system to switch to the hot air / hot water mode; when fh > Fx - δf1, controlling the air conditioning system to continue in the heating mode; where δf1 is an allowable error value. This makes it easier to accurately determine the switching between different modes, and thus facilitates flexible control of the modes.

[0116] Specifically, after entering the heating mode, the control method further includes: acquiring signals indicating whether the user is using hot water and whether the hot water temperature meets the user's set temperature; and, if a signal indicating that the user is using hot water and the hot water temperature does not meet the user's set temperature is acquired, controlling the air conditioning system to switch to the hot air / hot water mode. This facilitates automatic temperature judgment and heating of the hot water, achieving automated heating.

[0117] In this embodiment, the control method further includes: acquiring the operating status of the air conditioning system and the water temperature of the water tank; when the air conditioning system is in cooling mode; when the water temperature of the water tank is less than or equal to a first preset temperature, controlling the air conditioning system to heat the water tank; when the water temperature of the water tank is greater than or equal to a second preset temperature, controlling the air conditioning system to exit the mode of heating the water tank; wherein, the second preset temperature is the water temperature set by the user, and the first preset temperature is less than the second preset temperature. This allows for flexible mode switching based on the water tank temperature, facilitating efficient energy utilization.

[0118] Specifically, the control method further includes: controlling the air conditioning system to start cooling and heating the water tank, and switching the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank. This is to maximize the satisfaction of the air conditioning system's needs for air conditioning and hot water heating.

[0119] In this embodiment, the water tank heating mode includes a heat recovery mode in which both indoor heat exchangers are in an evaporative heat absorption state. The heat recovery mode includes: a partial heat recovery mode in which both the outdoor heat exchanger and the water tank heat exchanger are in a condensing heat release state; and a full heat recovery mode in which the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensing heat release state. The water tank heating mode also includes a heat pump water heating mode in which the outdoor heat exchanger is in an evaporative heat absorption state, the indoor heat exchanger is stopped, and the water tank heat exchanger is in a condensing heat release state. The operating mode of the air conditioning system is switched by the indoor environment temperature Ta and / or the water temperature Tc of the water tank, including: when Ta ≥ T1 + δTa and Tc ≤ T4 - δTc, the air conditioning system is controlled to be in the full heat recovery mode; when Ta ≥ T1 + δTa, the air conditioning system is controlled to be in the cooling operation mode; when Tc ≤ T4 - δTc, the air conditioning system is controlled to be in the heat pump hot water mode; when Ta ≤ T1, the air conditioning system is controlled to stop cooling; when Tc ≥ T4, the air conditioning system is controlled to stop heating the water tank. This allows for flexible adjustment of hot water production and air conditioning based on the actual indoor air temperature and water tank temperature, enabling flexible mode switching and transformation to meet user needs.

[0120] Specifically, the control method further includes: controlling the air conditioning system to start heating and heating the water tank, and switching the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank. This is to meet the user's heating and water tank heating needs, flexibly satisfying user requirements and improving user comfort.

[0121] In this embodiment, the water tank heating modes include a cooling heat recovery mode that cools indoor air and heats the water tank, a heat pump hot water mode that heats the water tank but does not cool or heat indoor air, and a hot air hot water mode that heats the water tank and heats indoor air. The control method further includes: when Ta ≤ T2 - δTb and Tc ≤ T3 - δTc, controlling the air conditioning system to operate in the hot air hot water mode; when Ta ≤ T2 - δTb, controlling the air conditioning system to operate in a single heating mode that heats air but not the water tank; when Tc ≤ T3 - δTc, controlling the air conditioning system to operate in the heat pump hot water mode; when Ta ≥ T2, the air conditioning system stops heating; when Tc ≥ T3, the air conditioning system stops heating the water tank. This allows for flexible adjustment of water tank heating and air heating based on the actual temperature, thereby improving user flexibility and comfort.

[0122] like Figure 9 As shown, Embodiment 2 of the present invention provides an air conditioning system using the control method described above. The air conditioning system includes: an indoor heat exchange branch, comprising an indoor heat exchange pipe 11 and an indoor heat exchanger 12 mounted on the indoor heat exchange pipe 11; an outdoor heat exchange branch, comprising an outdoor heat exchange pipe 21 and an outdoor heat exchanger 22 mounted on the outdoor heat exchange pipe; a water tank heat exchange branch, comprising a heating pipe 31 and a water tank mounted on the heating pipe, the water tank being heated by a water tank heat exchanger 32; and a compression branch, comprising a compression pipe 41 and a compressor 42 mounted on the compression pipe. At least two of the indoor heat exchange branch, the outdoor heat exchange branch, and the water tank heat exchange branch are connected to the compression branch to form a heat exchange loop. This system configuration allows for flexible control of the connection relationships between the indoor heat exchange branch, the outdoor heat exchange branch, and the water tank heat exchange branch, thereby facilitating flexible mode switching and meeting different user needs.

[0123] In this embodiment, one end of the water tank heat exchange branch can be selectively connected to or disconnected from the compressor's exhaust port. The other end of the water tank heat exchange branch can be selectively connected to one end of the indoor heat exchange branch and / or one end of the outdoor heat exchange branch. The other end of the indoor heat exchange branch can be selectively connected to the compressor's suction port or exhaust port, and the other end of the outdoor heat exchange branch can be selectively connected to the compressor's suction port or exhaust port. This selection of the connection and disconnection relationships of specific ports facilitates further mode switching and improves the flexibility of mode switching.

[0124] In this embodiment, the air conditioning system further includes a four-way valve 50. The four-way valve has four connecting ports: a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port. The exhaust port can be selectively connected to or disconnected from the first connecting port, the intake port is connected to the third connecting port, the second connecting port can be selectively connected to or disconnected from the other end of the outdoor heat exchange branch, and the fourth connecting port can be selectively connected to or disconnected from the indoor heat exchange branch. The ability to connect and disconnect different ports of the four-way valve makes the overall connection relationship more flexible and adaptable to different operating modes.

[0125] In this embodiment, the air conditioning system further includes a first solenoid valve 61, which is disposed on the pipeline connecting the exhaust port and the first communication port to facilitate switching the compressor on and off.

[0126] In this embodiment, the air conditioning system further includes a second solenoid valve 62, which is disposed on the heat exchange branch of the water tank to facilitate switching between connecting and disconnecting the heat exchange branch of the water tank.

[0127] In this embodiment, the air conditioning system further includes a third solenoid valve 63, which is disposed on the outdoor heat exchange branch to facilitate switching between connecting and disconnecting the outdoor heat exchange branch.

[0128] Specifically, the air conditioning system in this embodiment also includes a first electronic expansion valve 71 and a second electronic expansion valve 72.

[0129] Specifically, the air-conditioning water heater product in this embodiment can be matched with water tanks of different capacities.

[0130] For the water tanks that are matched with each other, test the relevant parameters k, m, and z.

[0131] Products equipped with relevant water tanks are operating under cooling and heat recovery mechanisms as follows:

[0132] When entering the cooling and heat recovery operation (when the water tank and indoor unit are not matched, there is a high-pressure protection issue due to high-frequency operation of the compressor, so it is necessary to distinguish between partial heat recovery and full heat recovery operation):

[0133] For example: A 3P outdoor unit paired with a 3P indoor unit and a 200L water tank is not a good match (a 200L water tank is a good match for a 1.5P indoor unit). If the upper limit of the cooling operating frequency Fy = 80Hz, then the upper limit frequency correction value K = 80 / 2 = 40Hz. When the compressor's target operating frequency fc ≤ 80Hz - 40Hz - δf0 = 40Hz - δf0 (δf0 is a deviation value of 2-5Hz set to avoid frequent system switching), it will operate in full heat recovery mode. If the compressor's target operating frequency fc ≥ 40Hz, in order to avoid the system entering high-pressure protection mode, it will switch to partial heat recovery mode.

[0134] When the compressor target frequency fc≤Fc(k)-δf0 is detected, it enters full heat recovery operation; otherwise, it operates in partial heat recovery mode.

[0135] If the system enters full heat recovery operation, it will enter partial heat recovery operation when the compressor target frequency fc ≥ Fc(k) is detected; otherwise, it will remain in full heat recovery operation.

[0136] If partial heat recovery operation is entered, the compressor target frequency fc≤Fc(k)-δf0 is checked again. If the condition is met, the operation is switched to full heat recovery operation.

[0137] Fc(k) = Fy - k, where Fy is the upper limit frequency curve of the compressor's cooling operation, and k is the upper limit frequency correction value of the matching water tank. When the water tank and the indoor unit are matched, the compressor can run at the upper frequency limit, and the correction value is 0. When the water tank and the indoor unit are not matched, the compressor frequency needs to be corrected downward.

[0138] Specifically, products equipped with relevant water tanks are operating as heat pump water heaters:

[0139] When the heat pump is running, the target operating frequency of the compressor is adjusted to fs = Fs(m).

[0140] Fs(m) = Fz - m, where Fz is the target operating frequency of the compressor under different outer ring and water temperatures when the maximum water tank configuration is used, and m is the correction value of the target operating frequency at this time (when there is a large outdoor unit configuration and a small water tank configuration, the compressor frequency needs to be corrected downward).

[0141] Specifically, products equipped with relevant water tanks are in hot air and hot water operation:

[0142] When entering hot air / hot water operation, the compressor's target operating frequency fh = Fh(z) is corrected. The corrected target frequency fh ≤ Fx - δf1 is checked. If the condition is met, the compressor enters hot air / hot water operation; otherwise, it enters air conditioning heating operation.

[0143] If the system enters hot air / hot water operation, it will switch to air conditioning heating operation when the compressor target frequency fh ≥ Fx is detected; otherwise, it will maintain the current operation.

[0144] If the air conditioner enters heating mode, it continues to check the compressor target frequency fh≤Fx-δf1. If the condition is met, it switches to hot air / hot water mode. Here, air conditioner heating can be understood as single heating mode operation.

[0145] If the air conditioner is in heating mode, there may be conditions for users to use hot water. When these conditions are met, the system will switch to heat pump hot water operation. When users stop using hot water, the system will switch to hot air hot water operation.

[0146] fh=Fh(z)=Fk+z, where Fk is the target operating frequency of the air conditioner during heating, and z is the compressor frequency required to be increased when adding a water tank (adding a water tank requires increasing the heating capacity, so the compressor frequency needs to be increased).

[0147] fh≤Fx-δf1, where Fx is the upper limit frequency for air conditioning heating operation. When the outdoor unit cannot supply power to the indoor unit and the water tank simultaneously, priority is given to air conditioning heating (set the maximum water tank capacity Lmax, the water tank capacity is L, and L / Lmax = frequency ratio).

[0148] Products equipped with the corresponding water tank are in cooling operation:

[0149] When in cooling mode, the system detects that the water tank temperature Tc ≤ T4 - δTc. If this condition is met, it automatically enters cooling heat recovery mode. Once the water tank temperature rises and Tc ≥ T4, it exits cooling heat recovery mode and enters air conditioning cooling mode. This cooling mode can be understood as single cooling mode operation.

[0150] The five corresponding operating states are as follows:

[0151] 1. When the air conditioner is turned on for cooling, it will start cooling operation when the inner ring temperature Ta ≥ T1 + δTa (the inner ring temperature Ta is less than the air conditioner's cooling set value T1). After the inner ring temperature drops, the air conditioner will stop when the inner ring temperature Ta ≤ T1 is reached.

[0152] 2. When the air conditioner is turned on for heating, it will start heating operation when the inner ring temperature Ta ≤ T2 - δTb (the inner ring temperature Ta is greater than the air conditioner's heating setting value T2). After the inner ring temperature rises, the air conditioner will stop when the inner ring temperature Ta ≥ T2 is reached and the heating temperature point is reached.

[0153] 3. When the heat pump is turned on to produce hot water, it will start operating when the water temperature Tc ≤ T3 - δTc (the water temperature Tc is less than the water heater's set temperature T3). When the water temperature rises and Tc ≥ T3, the system will stop when the hot water temperature is reached.

[0154] 4. When the air conditioner starts cooling and the heat pump starts hot water, the following conditions apply: Condition 1: Inner loop Ta ≥ T1 + δTa; Condition 2: Water temperature Tc ≤ T4 - δTc (T4 is the set value of the cooling and heat recovery water temperature); If conditions 1 and 2 are met, the system will enter full heat recovery; if only condition 1 is met, the system will enter air conditioning cooling operation; if only condition 2 is met, the system will enter heat pump hot water operation.

[0155] When the air conditioner is cooling, the air conditioner water heater will stop when the inner ring temperature Ta≤T1 is met; when the heat pump water heater is running, the air conditioner water heater will stop when the water temperature Tc≥T4 is met; and the air conditioner cooling or heat pump water heater will detect whether conditions 1 and 2 are met.

[0156] 5. When the air conditioner is turned on for heating and the heat pump is turned on for hot water, the following conditions apply: 1. Inner ring Ta ≤ T2 - δTb; 2. Water temperature Tc ≤ T3 - δTc. If conditions 1 and 2 are met, the system will enter hot air / hot water operation. If only condition 1 is met, the system will enter air conditioner heating operation. If only condition 2 is met, the system will enter heat pump hot water operation.

[0157] When the air conditioner is in heating mode, the air conditioner water heater will stop when the inner ring temperature Ta≥T2 is met; when the heat pump water heater is in operation, the air conditioner water heater will stop when the water temperature Tc≥T3 is met; and the air conditioner in heating mode or heat pump water heater operation will detect whether conditions 1 and 2 are met.

[0158] Specifically, the operational status is controlled as follows:

[0159] Air conditioner operation signals: Air conditioner cooling mode is on; Air conditioner heating mode is on.

[0160] Heat pump water heater operation signal: Heat pump water heating is on.

[0161] Six operating states:

[0162] Air conditioning cooling operation: The air conditioner is turned on for cooling.

[0163] Air conditioning heating operation: Turn on the air conditioner for heating.

[0164] Cooling and heat recovery operation (full or partial heat recovery): The air conditioner is turned on for cooling and the heat pump for hot water is turned on.

[0165] Heat pump hot water operation: The heat pump hot water production unit is turned on.

[0166] Hot air and hot water operation: The air conditioner is turned on for heating and the heat pump is turned on for hot water.

[0167] Two modes:

[0168] Cooling mode: Air conditioning cooling operation or cooling heat recovery operation (including full heat recovery or partial heat recovery).

[0169] Heating mode: Air conditioning heating operation, heat pump hot water operation, or hot air hot water operation.

[0170] The four-way valve is controlled as follows:

[0171] The four-way valve is 1 when energized and 0 when de-energized.

[0172] (1) Cooling mode: When the air conditioner is in cooling mode or in cooling heat recovery mode (including full heat recovery or partial heat recovery), the four-way valve will immediately lose power.

[0173] (2) Heating mode: When the air conditioner is in heating mode, the heat pump is in hot water mode, or the hot air is in hot water mode, the four-way valve is immediately energized.

[0174] (3) Heating mode off, heating mode switches to cooling mode, unit stops [T] 停机四通阀掉电时间 After that, the four-way valve lost power.

[0175] (4) Defrosting process: The entire machine stops during the defrosting process [T] 进入化霜四通阀掉电时间 After that, the four-way valve loses power; defrosting is discontinued and the entire machine stops. 退出化霜四通阀掉电时间 After that, the four-way valve lost power.

[0176] Mode conversion processing:

[0177] Switching from cooling mode to heating mode or vice versa: Unit shuts down [T] 停机时间 Then start by pressing the settings.

[0178] The solenoid valve control is as follows:

[0179] When the solenoid valve is energized, the value is 1; when the solenoid valve is de-energized, the value is 0.

[0180] Cooling modes: Air conditioning cooling operation, full heat recovery, partial heat recovery;

[0181] Air conditioning cooling operation: First solenoid valve 61 and third solenoid valve 63 are immediately energized, second solenoid valve 62 is not energized, [Solenoid valve 01 position].

[0182] Full heat recovery operation: The second solenoid valve is energized, the first solenoid valve and the third solenoid valve 63 are not energized, [the solenoid valves are in position 010].

[0183] Partial heat recovery operation: The first solenoid valve, the second solenoid valve 62, and the third solenoid valve 63 are energized [the solenoid valves are in position 11].

[0184] Heating modes: Air conditioning heating mode, heat pump hot water mode, hot air hot water mode;

[0185] Air conditioning heating operation: The first and third solenoid valves 63 are immediately energized, while the second solenoid valve is not energized. [The solenoid valves are in position 01].

[0186] Heat pump hot water operation: The first solenoid valve is not energized, while the second and third solenoid valves 63 are immediately energized [the solenoid valves are in position 011].

[0187] Hot air / hot water operation: The first solenoid valve, the second solenoid valve 62, and the third solenoid valve 63 are energized [the solenoid valves are in position 11].

[0188] Operation switching: Air conditioning cooling operation can be switched between full heat recovery and partial heat recovery; air conditioning heating operation can be switched between hot air / hot water operation and heat pump hot water operation; operation switching does not require shutting down the entire unit, the mode switching is completed by directly switching the solenoid valve.

[0189] Outdoor unit defrosting: When the air conditioner is in heating mode, hot air / hot water mode, or heat pump hot water mode, the solenoid valve is in position 01 during outdoor unit defrosting.

[0190] The electronic expansion valve is controlled as follows:

[0191] When the first solenoid valve 71 is in position 01 (air conditioning cooling or heating operation), the first electronic expansion valve is closed, and the second electronic expansion valve is controlled according to the opening degree of the air conditioning expansion valve.

[0192] When the solenoid valve is in position 010 (full heat recovery), the first electronic expansion valve is controlled according to the opening degree of the water heater expansion valve, and the second electronic expansion valve is fully open.

[0193] The first solenoid valve for refrigeration is in position 11 (partial heat recovery), the first electronic expansion valve is controlled according to the opening degree of the water heater expansion valve, and electronic expansion valve B is controlled according to the opening degree of the air conditioner expansion valve.

[0194] When the solenoid valve is in position 011 (heat pump hot water operation), the second electronic expansion valve is fully closed, and the first electronic expansion valve is controlled according to the opening degree of the water heater expansion valve.

[0195] The first solenoid valve for heating is in position 11 (hot air and hot water operation); the first electronic expansion valve is controlled according to the opening degree of the water heater expansion valve; the second electronic expansion valve is controlled according to the opening degree of the air conditioner expansion valve.

[0196] The compressor control is as follows:

[0197] When the first solenoid valve is in position 01 (air conditioning cooling or heating operation), or in position 010 (full heat recovery), or in position 11 (partial heat recovery or hot air / hot water operation), the compressor is controlled according to the air conditioning compressor frequency.

[0198] Solenoid valve position 011 (heat pump hot water operation), compressor controlled according to the water heater compressor frequency.

[0199] For air conditioning heating systems: an air conditioning water heater system contains a compressor, a four-way valve, three solenoid valves, two electronic expansion valves, a water tank, an indoor unit evaporator, and an outdoor unit condenser.

[0200] Full heat recovery: The four-way valve's E port (first connecting port), D port (second connecting port), S port (third connecting port), and C port (fourth connecting port) are connected. The first solenoid valve is closed, the third solenoid valve is closed, and the second solenoid valve is open. The first electronic expansion valve 71 is fully open. The circulation system is controlled by adjusting the opening of the second electronic expansion valve. After the refrigerant exits the compressor, it flows through the water tank system, the second electronic expansion valve 72, and the indoor unit before flowing back into the compressor. Specific operating modes include the following:

[0201] Partial heat recovery: When ports E and D, and ports S and C of the four-way valve are connected, the first, second, and third solenoid valves open. The opening of the first and second electronic expansion valves is adjusted to control the circulation system. After the refrigerant leaves the compressor, it splits into two streams: one flows through the outdoor unit, and the other flows through the water tank and the first electronic expansion valve. The two streams merge and then flow through the second electronic expansion valve and the indoor unit before returning to the compressor.

[0202] Air conditioning cooling operation: When ports E and D, and ports S and C of the four-way valve are connected, the second solenoid valve is closed, the first solenoid valve is open, the third solenoid valve is open, and the first electronic expansion valve is closed. The circulation system is controlled by adjusting the opening of the second electronic expansion valve. After the refrigerant comes out of the compressor, it flows through the outdoor unit condenser, the second electronic expansion valve, and the indoor unit before flowing back into the compressor.

[0203] Air conditioning heating operation: The four-way valve's C and D ports, and E and S ports are connected. The second solenoid valve is closed, the first solenoid valve is open, the third solenoid valve is open, and the first electronic expansion valve is closed. The circulation system is controlled by adjusting the opening of the second electronic expansion valve. After leaving the compressor, the refrigerant flows through the indoor unit, the second electronic expansion valve, and the outdoor unit before flowing back into the compressor.

[0204] Heat pump hot water operation: Connect ports C and D, and ports E and S of the four-way valve. The first solenoid valve is closed, the second solenoid valve is open, the third solenoid valve is open, and the second electronic expansion valve is closed. Adjust the opening of the first electronic expansion valve to control the circulation system. After the refrigerant comes out of the compressor, it flows through the water tank system, the first electronic expansion valve, and the outdoor unit before flowing back into the compressor.

[0205] Hot air / hot water operation: Connect ports C and D, and ports E and S of the four-way valve. The first, second, and third solenoid valves open, regulating the first and second electronic expansion valves to adjust the refrigerant flow in the water tank system and the indoor unit. After leaving the compressor, the refrigerant splits into two streams: one flows through the indoor unit and the second electronic expansion valve, and the other flows through the water tank system and the first electronic expansion valve. The two streams merge and flow through the outdoor unit, finally returning to the compressor.

[0206] It should be noted that in this embodiment, the actual target operating frequency, actual operating frequency, and upper limit frequency for different operating modes can all be represented by different letters.

[0207] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: the heat pump water heater product is adaptable to different water tank specifications, ensuring its efficient and reliable operation. The combined hot air and hot water supply prioritizes meeting the heating effect of the air conditioner, with excess heat then used to produce hot water.

[0208] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0209] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0210] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0211] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0212] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0213] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method, characterized in that, The control method is adapted to an air conditioning system, which includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, and a water tank heat exchanger. The air conditioning system has a water tank heating mode for heating the water tank via the water tank heat exchanger and a single air conditioning mode for separately regulating indoor air. The water tank heating mode includes an air conditioning water heating mode that heats the water tank and regulates indoor air. The control method includes: The system obtains the operating mode of the air conditioning system in the air conditioning water heating mode, the initial target operating frequency of the compressor in the single air conditioning mode corresponding to the air conditioning water heating mode, and the water storage capacity of the water tank. The correction frequency of the compressor is determined based on the operating mode of the air conditioning system in the air conditioning water heating mode and the water storage capacity of the water tank, and the initial target operating frequency is corrected using the correction frequency to obtain the actual target operating frequency of the compressor. The compressor is controlled to operate at the actual target operating frequency; or, the actual operating frequency of the compressor is compared with the actual target operating frequency, and the operating mode of the air conditioning system is adjusted according to the comparison result.

2. The control method according to claim 1, characterized in that, The air conditioning water heating mode includes a cooling heat recovery mode that cools indoor air and heats the water tank, and a hot air / hot water mode that heats the water tank and heats indoor air; the step of determining the compressor's correction frequency based on the air conditioning system's operating mode in the air conditioning water heating mode and the water tank's storage capacity, and using the correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes: When the air conditioning system is in the cooling and heat recovery mode, the water storage capacity of the water tank is used to determine whether it is compatible with the initial target operating frequency of the compressor, and whether the initial target operating frequency needs to be corrected. When the air conditioning system is in the hot air and hot water mode, the correction frequency is the target frequency of the water heater that heats the water tank, and the actual target operating frequency is the sum of the initial target operating frequency and the correction frequency.

3. The control method according to claim 1, characterized in that, The air conditioning water heating mode includes a cooling heat recovery mode that cools indoor air and heats the water tank; the step of determining the compressor's correction frequency based on the air conditioning system's operating mode in the air conditioning water heating mode and the water tank's storage capacity, and using the correction frequency to correct the initial target operating frequency to obtain the compressor's actual target operating frequency, includes: When the air conditioning system is in the cooling and heat recovery mode, determine whether the initial target operating frequency of the compressor is compatible with the water storage capacity of the water tank; When the water storage capacity of the water tank is compatible with the initial target operating frequency of the compressor, the actual target operating frequency of the compressor is determined to be the initial target operating frequency of the compressor. If the water storage capacity of the water tank is not compatible with the initial target operating frequency of the compressor, the corrected frequency of the compressor is calculated based on the water storage capacity of the water tank.

4. The control method according to claim 3, characterized in that, The water tank heating mode also includes a heat pump water heating mode that heats the water tank but does not cool or heat the indoor air; the calculation of the correction frequency based on the water tank's storage capacity includes: Obtain the maximum heating capacity of the air conditioning system in the heat pump hot water mode, and calculate the maximum suitable water storage capacity V0 corresponding to the maximum heating capacity based on the maximum heating capacity. The corrected frequency k is calculated based on V1 / V0=k / F0; Wherein, V1 is the water storage capacity of the water tank, and F0 is the operating frequency of the compressor corresponding to the maximum heating capacity.

5. The control method according to claim 4, characterized in that, The step of correcting the initial target operating frequency of the compressor using the corrected frequency to obtain the actual target operating frequency includes: Compare the magnitude of the corrected frequency k with the initial target operating frequency of the compressor; When the correction frequency k is less than or equal to the initial target operating frequency, the actual target operating frequency is made equal to the correction frequency k. When the correction frequency k is greater than the initial target operating frequency, the actual target operating frequency is made equal to the initial target operating frequency.

6. The control method according to claim 1, characterized in that, The water tank heating mode includes a cooling heat recovery mode for both indoor air cooling and water tank heating. The cooling heat recovery mode includes: a partial heat recovery mode where both the outdoor heat exchanger and the water tank heat exchanger are in a condensation and heat release state; and a full heat recovery mode where the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensation and heat release state. The control method further includes: Under the aforementioned cooling and heat recovery mode; The actual operating frequency fc of the compressor is compared with the actual target operating frequency Fc(k); The air conditioning system is determined to switch to either the full heat recovery mode or the partial heat recovery mode based on the comparison between the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k).

7. The control method according to claim 6, characterized in that, The step of determining whether the air conditioning system should switch to the full heat recovery mode or the partial heat recovery mode based on the comparison result between the actual operating frequency fc of the compressor and the actual target operating frequency Fc(k) includes: When the air conditioning system activates the cooling and heat recovery mode; when fc≤Fc(k)-δf0, the air conditioning system is controlled to enter the full heat recovery mode; when fc>Fc(k)-δf0, the air conditioning system is controlled to enter the partial heat recovery mode. After entering the full heat recovery mode; when fc≥Fc(k), control the air conditioning system to switch to the partial heat recovery mode; when fc<Fc(k), control the air conditioning system to continue in the full heat recovery mode; After entering the partial heat recovery mode; when fc≥Fc(k), the air conditioning system is controlled to continue in the partial heat recovery mode; when fc<Fc(k), the air conditioning system is controlled to switch to the full heat recovery mode. δf0 is the allowable error value.

8. The control method according to claim 1, characterized in that, The water tank heating mode includes a heat pump hot water mode that heats the water tank but does not cool or heat the indoor air; the control method further includes: The corrected frequency is calculated based on the capacity of the water tank, and the compressor operates at the corrected frequency.

9. The control method according to claim 1, characterized in that, The single air conditioning system has an air conditioning mode that does not heat the water tank, and the air conditioning mode includes a single heating mode and a single cooling mode; the water tank heating mode includes a heat pump hot water mode that heats the water tank but does not cool or heat the indoor air and a hot air hot water mode that heats the water tank and heats the indoor air. The control method further includes: The air conditioning system is controlled to start the hot air and hot water mode, and the actual operating frequency fh of the compressor is controlled to run at the actual target operating frequency Fh(z); Wherein, the actual target operating frequency Fh(z) is equal to the sum of the initial target operating frequency Fk of the air conditioning system when it is running in the single heating mode and the compressor frequency z when the water tank is heated using the heat pump hot water mode.

10. The control method according to claim 9, characterized in that, After controlling the compressor to operate at the actual target operating frequency Fh(z) at the actual operating frequency fh, the control method further includes: The actual operating frequency fh of the compressor is compared with the upper limit frequency Fx of the air conditioning system operating in the heating mode; Based on the comparison between the actual operating frequency fh of the compressor and the upper limit frequency Fx of the air conditioning system operating in the heating mode, it is determined whether the air conditioning system should switch to the heating mode or continue to operate in the hot air / hot water mode.

11. The control method according to claim 10, characterized in that, The step of determining whether the air conditioning system should switch to the heating mode or continue operating in the hot air / hot water mode based on a comparison between the actual operating frequency fh of the compressor and the upper limit frequency Fx of the air conditioning system in the heating mode includes: When the air conditioning system is in the hot air / hot water mode; when fh≤Fx-δf1, the air conditioning system is controlled to continue in the hot air / hot water mode; when fh>Fx-δf1, the air conditioning system is controlled to switch to the heating mode. After entering the hot air and hot water mode; when fh≥Fx, control the air conditioning system to switch to the heating mode; when fh<Fh(z), control the air conditioning system to continue in the hot air and hot water mode; After entering the heating mode; when fh≤Fx-δf1, control the air conditioning system to switch to the hot air / hot water mode; when fh>Fx-δf1, control the air conditioning system to continue in the heating mode; δf1 is the allowable error value.

12. The control method according to claim 11, characterized in that, After entering the heating mode; The control method further includes: Acquire signals indicating whether the user is using hot water and whether the hot water temperature meets the user's set temperature; If a signal is received indicating that the user is using hot water and the hot water temperature does not meet the user's set temperature, the air conditioning system is controlled to switch to the hot air and hot water mode.

13. The control method according to claim 1, characterized in that, The control method further includes: Obtain the operating status of the air conditioning system and the water temperature of the water tank; When the air conditioning system is in cooling mode; when the water temperature in the water tank is less than or equal to a first preset temperature, the air conditioning system is controlled to heat the water tank; when the water temperature in the water tank is greater than or equal to a second preset temperature, the air conditioning system is controlled to exit the mode of heating the water tank. The second preset temperature is the water temperature set by the user, and the first preset temperature is lower than the second preset temperature.

14. The control method according to claim 1, characterized in that, The control method further includes: The system controls the air conditioning system to start cooling and heating the water tank, and switches the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank.

15. The control method according to claim 14, characterized in that, The water tank heating mode includes a heat recovery mode where both indoor heat exchangers are in an evaporative heat absorption state. The heat recovery mode further includes: a partial heat recovery mode where both the outdoor heat exchanger and the water tank heat exchanger are in a condensing heat release state; and a full heat recovery mode where the outdoor heat exchanger is stopped and the water tank heat exchanger is in a condensing heat release state. The water tank heating mode also includes a heat pump hot water mode where the outdoor heat exchanger is in an evaporative heat absorption state, the indoor heat exchanger is stopped, and the water tank heat exchanger is in a condensing heat release state. Switching the operating mode of the air conditioning system based on the indoor ambient temperature Ta and / or the water temperature Tc of the water tank includes: When Ta≥T1+δTa, Tc≤T4-δTc, the air conditioning system is controlled to be in the full heat recovery mode; When Ta≥T1+δTa, the air conditioning system is controlled to be in cooling operation mode; When Tc≤T4-δTc, the air conditioning system is controlled to be in the heat pump hot water mode; When Ta≤T1, the air conditioning system is controlled to stop cooling; When Tc≥T4, the air conditioning system is controlled to stop heating the water tank.

16. The control method according to claim 1, characterized in that, The control method further includes: The system controls the air conditioning system to start heating and heat the water tank, and switches the operating mode of the air conditioning system according to the indoor environment Ta and / or the water temperature Tc of the water tank.

17. The control method according to claim 16, characterized in that, The water tank heating modes include a cooling heat recovery mode that cools indoor air and heats the water tank, a heat pump hot water mode that heats the water tank but does not cool or heat indoor air, and a hot air hot water mode that heats the water tank and heats indoor air; the control method further includes: When Ta≤T2-δTb and Tc≤T3-δTc, the air conditioning system is controlled to operate in the hot air and hot water mode; When Ta≤T2-δTb, the air conditioning system is controlled to operate in a single heating mode that heats the air but not the water tank. When Tc≤T3-δTc, the air conditioning system is controlled to operate in the heat pump hot water mode; When Ta ≥ T2, the air conditioning system stops heating; When Tc≥T3, the air conditioning system stops heating the water tank.

18. An air conditioning system, characterized in that, The air conditioning system, employing the control method described in any one of claims 1 to 17, comprises: Indoor heat exchange branch, including indoor heat exchange pipeline and indoor heat exchanger installed on the indoor heat exchange pipeline; An outdoor heat exchange branch includes an outdoor heat exchange pipeline and an outdoor heat exchanger installed on the outdoor heat exchange pipeline. The water tank heat exchange branch includes a heating pipe and a water tank installed on the heating pipe; A compression branch includes a compression pipeline and a compressor disposed on the compression pipeline; At least two of the indoor heat exchange branch, the outdoor heat exchange branch, and the water tank heat exchange branch are connected to the compression branch to form a heat exchange loop.

19. The air conditioning system according to claim 18, characterized in that, One end of the water tank heat exchange branch can be selectively connected to or disconnected from the compressor's exhaust port. The other end of the water tank heat exchange branch can be selectively connected to one end of the indoor heat exchange branch and / or one end of the outdoor heat exchange branch. The other end of the indoor heat exchange branch can be selectively connected to the compressor's suction port or the exhaust port. The other end of the outdoor heat exchange branch can be selectively connected to the compressor's suction port or the exhaust port.

20. The air conditioning system according to claim 19, characterized in that, The air conditioning system also includes: A four-way valve and a first solenoid valve, wherein the four-way valve has four connecting ports including a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port; the exhaust port is selectively connected to or disconnected from the first connecting port; the intake port is connected to the third connecting port; the second connecting port is selectively connected to or disconnected from the other end of the outdoor heat exchange branch; and the fourth connecting port is selectively connected to or disconnected from the indoor heat exchange branch; the first solenoid valve is disposed on the pipeline connecting the exhaust port and the first connecting port; and / or, A second solenoid valve is installed on the heat exchange branch of the water tank; and / or a third solenoid valve is installed on the outdoor heat exchange branch.

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