Control method and control device of heat pump system and heat pump system

Abstract

The invention provides a control method and device of a heat pump system and the heat pump system. The control method of the heat pump system comprises the steps that the current working mode of the heat pump system and the outdoor environment temperature are obtained, and the target water outlet temperature of the heat pump system in the current working mode is obtained; and according to the current working mode, the target water outlet temperature and the outdoor environment temperature, target pressure parameters of a compressor of the heat pump system are determined and obtained, and the compressor is adjusted to the target pressure parameters. According to the control method and control device of the heat pump system and the heat pump system, the target pressure parameter currently needed by the compressor can be rapidly determined by establishing the relational expression that the outdoor environment temperature and the target outlet water temperature are associated with the target pressure parameter, then the system can be rapidly balanced, and the service life of the system is prolonged. And the self-adjustment time of the system is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to a control method, a control device and a heat pump system for a heat pump system. Background Art

[0002] In the related art, current heat pump water heaters are usually controlled according to the original air-conditioning fluorine machine system. Generally, during heating, control is performed according to the target high-pressure pressure or the saturation temperature corresponding to the target high-pressure pressure. However, this kind of control often ignores the influence of the low-pressure pressure or the saturation temperature corresponding to the low-pressure pressure at different ambient temperatures on the system control, and can only passively control the low-pressure pressure or the low-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0003] Similarly, during system refrigeration, control is performed according to the target low-pressure pressure or the saturation temperature corresponding to the target low-pressure pressure. However, this kind of control often ignores the influence of the high-pressure pressure or the saturation temperature corresponding to the high-pressure pressure at different ambient temperatures on the system control, and can only passively control the high-pressure pressure or the high-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste. Summary of the Invention

[0004] The present invention provides a control method, a control device and a heat pump system for a heat pump system to solve the defects existing in the prior art and achieve the following technical effects: By establishing a relational expression in which the outdoor ambient temperature and the target water outlet temperature are respectively associated with the target pressure parameter, the target pressure parameter currently required by the compressor can be quickly determined, and then the system can quickly reach a balance, greatly reducing the system self-adjustment time.

[0005] According to the control method of the heat pump system described in the first aspect embodiment of the present invention, it includes:

[0006] Obtain the current working mode and the outdoor ambient temperature of the heat pump system, and obtain the target water outlet temperature of the heat pump system in the current working mode;

[0007] According to the current working mode, the target water outlet temperature and the outdoor ambient temperature, determine the target pressure parameter of the compressor of the heat pump system, and adjust the compressor to the target pressure parameter.

[0008] According to an embodiment of the present invention, the target pressure parameter includes the target high-pressure pressure parameter and the target low-pressure pressure parameter of the compressor, and the target high-pressure pressure parameter includes the target high-pressure pressure or the saturation temperature of the target high-pressure pressure of the compressor, and the target low-pressure pressure parameter includes the target low-pressure pressure or the saturation temperature of the target low-pressure pressure of the compressor.

[0009] According to an embodiment of the present invention, the step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter specifically includes:

[0010] Determine that the current working mode is the heating mode;

[0011] In the heating mode, determine the target high-pressure pressure parameter of the compressor according to the target water outlet temperature;

[0012] In the heating mode, determine the target low-pressure pressure parameter of the compressor according to the outdoor ambient temperature;

[0013] Adjust the working parameters of the compressor according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

[0014] According to an embodiment of the present invention, the step of determining the target high-pressure pressure parameter of the compressor according to the target water outlet temperature in the heating mode specifically includes:

[0015] In the heating mode, if the target water outlet temperature is Tset, then the determined target high-pressure pressure protection temperature Pd_t is: Pd_t = Tset + α (α is a constant).

[0016] According to an embodiment of the present invention, the step of determining the target low-pressure pressure parameter of the compressor according to the outdoor ambient temperature in the heating mode specifically includes:

[0017] When the outdoor ambient temperature is less than the first set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the first low-pressure temperature;

[0018] When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the second low-pressure temperature;

[0019] When the outdoor ambient temperature is greater than or equal to the second set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the third low-pressure temperature;

[0020] Wherein, the first low-pressure temperature is greater than the second low-pressure temperature, the second low-pressure temperature is greater than or equal to the third low-pressure temperature, and the first low-pressure temperature, the second low-pressure temperature, and the third low-pressure temperature are respectively positively correlated with the outdoor ambient temperature.

[0021] According to an embodiment of the present invention, the step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter specifically includes:

[0022] Determine that the current working mode is the refrigeration mode;

[0023] In the refrigeration mode, determine the target low-pressure pressure parameter of the compressor according to the target water outlet temperature;

[0024] In the refrigeration mode, determine the target high-pressure pressure parameter of the compressor according to the outdoor ambient temperature;

[0025] Adjust the working parameters of the compressor according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

[0026] According to an embodiment of the present invention, the step of determining the target low-pressure pressure parameter of the compressor according to the target water outlet temperature in the refrigeration mode specifically includes:

[0027] In the refrigeration mode, if the target water outlet temperature is Tset, then the determined target low-pressure pressure protection temperature Ps_t is: Ps_t = Tset - β (β is a constant).

[0028] According to an embodiment of the present invention, the step of determining the target high-pressure pressure parameter of the compressor according to the outdoor ambient temperature in the refrigeration mode specifically includes:

[0029] When the outdoor ambient temperature is less than the third set temperature, determine that the target high-pressure pressure saturation temperature of the compressor is the first high temperature;

[0030] When the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, determine that the target high-pressure pressure saturation temperature of the compressor is the second high temperature;

[0031] When the outdoor ambient temperature is greater than or equal to the fourth set temperature, determine that the target high-pressure pressure saturation temperature of the compressor is the third high temperature;

[0032] Wherein, the second high temperature and the third high temperature are both greater than the first high temperature, and the first high temperature, the second high temperature, and the third high temperature are respectively positively correlated with the outdoor ambient temperature.

[0033] According to an embodiment of the present invention, after the step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter, the method further includes:

[0034] Controlling and adjusting the frequency of the compressor and / or the opening degree of the electronic expansion valve according to the target pressure parameter and the specifications of the compressor.

[0035] A control device for a heat pump system according to an embodiment of the second aspect of the present invention includes:

[0036] An acquisition module, configured to acquire the current working mode and the outdoor ambient temperature of the heat pump system, and acquire the target water outlet temperature of the heat pump system in the current working mode;

[0037] A control module, configured to determine the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjust the compressor to the target pressure parameter.

[0038] A heat pump system according to an embodiment of the third aspect of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the control method of the heat pump system as described in the embodiment of the first aspect of the present invention is implemented.

[0039] The present invention provides a control method for a heat pump system. The control method classifies different working modes of the heat pump system, and combines the target water outlet temperature and the outdoor ambient temperature in the current working mode to calculate the target pressure parameters required by the heat pump system under different working modes and different parameter conditions. Thus, the target pressure parameters of the heat pump system in various different situations can be quickly determined, and then the heat pump system can quickly reach a balanced state.

[0040] That is, the present invention can quickly determine the current target pressure parameter of the compressor by establishing a relational expression that correlates the outdoor ambient temperature and the target water outlet temperature with the target pressure parameter respectively. Furthermore, the system can quickly reach a balance, greatly reducing the system self-adjustment time. It can be understood that compared with the passive control method of the fan with a long process duration and complex operation in the related art, the control method proposed by the present invention has a shorter duration, simpler operation and higher accuracy. Description of the Drawings

[0041] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 is one of the schematic flowcharts of the control method of the heat pump system provided by the present invention;

[0043] Figure 2 is another schematic flowchart of the control method of the heat pump system provided by the present invention;

[0044] Figure 3 is the schematic structural diagram of the control device of the heat pump system provided by the present invention;

[0045] Figure 4 is the schematic structural diagram of the heat pump system provided by the present invention;

[0046] Figure 5 is the schematic structural diagram of the electronic device provided by the present invention.

[0047] Reference numerals:

[0048] 1, compressor; 2, four-way valve; 3, outdoor heat exchanger; 4, throttling device; 5, water-fluorine heat exchanger; 6, water pump; 110, acquisition module; 120, control module. Detailed embodiments

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0050] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] The control method, control device, and heat pump system of the heat pump system proposed by the present invention will be described below with reference to the accompanying drawings. Among them, before the detailed description of the embodiments of the present invention, the entire application scenario will be described first. The control method, control device, electronic device, and computer-readable storage medium of the heat pump system in the embodiments of the present invention can be applied not only to the local heat pump system, but also to the cloud platform in the Internet field, or the cloud platform in other types of Internet fields, or can also be applied to third-party devices. Among them, the third-party devices may include various different types such as mobile phones, tablet computers, notebooks, in-vehicle computers, and other intelligent terminals.

[0052] The following will only take the control method applicable to the heat pump system as an example for illustration. It should be understood that the control method in the embodiments of the present invention can also be applicable to the cloud platform and third-party devices. It should also be noted that the control method of the heat pump system proposed by the present invention is universal, that is, this method is applicable to both the heat pump system for refrigeration or heating in a low-temperature environment or a high-temperature environment.

[0053] As Figure 1 shown, the control method of the heat pump system according to the first aspect embodiment of the present invention includes:

[0054] Step S1, obtaining the current working mode and the outdoor ambient temperature of the heat pump system, and obtaining the target water outlet temperature of the heat pump system in the current working mode;

[0055] Step S2, determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter.

[0056] The control method of the heat pump system according to the embodiment of the present invention has the following specific working process: After the heat pump system is turned on, the controller first determines the current working mode of the heat pump system, and obtains the current temperature of the outdoor environment through devices such as temperature sensors located outdoors. Then, in the current working mode of the heat pump system, the controller further obtains the target water outlet temperature in this mode. For example, the controller obtains the outdoor environmental temperature, and when the controller receives the signal of the heat pump system running in the cooling mode or the heating mode, the controller further obtains the target water outlet temperature of the heat pump system in the cooling mode or the heating mode.

[0057] After obtaining the above current working mode, outdoor environmental temperature, and target water outlet temperature, the controller analyzes and judges these three parameters, calculates the target pressure parameter of the compressor 1 based on the current working mode, outdoor environmental temperature, and target water outlet temperature, and further adjusts the working parameters of the compressor 1 according to the target pressure parameter as the standard, that is, adjusts the compressor 1 to the target pressure parameter.

[0058] In the related art, current heat pump water heaters usually adopt the control method of the original air-conditioning fluorine machine system. Generally, during heating, the control is based on the target high-pressure pressure or the saturation temperature corresponding to the target high-pressure pressure. However, this kind of control often ignores the influence of the low-pressure pressure or the saturation temperature corresponding to the low-pressure pressure on the system control under different ambient temperatures, and can only passively control the low-pressure pressure or the low-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0059] Similarly, during system cooling, the control is based on the target low-pressure pressure or the saturation temperature corresponding to the target low-pressure pressure. However, this kind of control often ignores the influence of the high-pressure pressure or the saturation temperature corresponding to the high-pressure pressure on the system control under different ambient temperatures, and can only passively control the high-pressure pressure or the high-pressure saturation temperature through the fan. This system control process is relatively long, and the time to reach the equilibrium state is also relatively long, resulting in a large amount of energy waste.

[0060] In summary, in order to solve the technical defects existing in the above related art, the present invention provides a control method for a heat pump system. This control method classifies different working modes of the heat pump system, and combines the target water outlet temperature and outdoor environmental temperature in the current working mode to specifically calculate the target pressure parameters required by the heat pump system under different working modes and different parameter conditions, so as to quickly determine the target pressure parameters of the heat pump system in various different situations, and further enable the heat pump system to quickly reach the equilibrium state.

[0061] That is, by establishing a relational expression that correlates the outdoor ambient temperature and the target water outlet temperature with the target pressure parameter respectively, the present invention can quickly determine the target pressure parameter required by the compressor 1 at present, and then can quickly bring the system into a balance, greatly reducing the system self-adjustment time. It can be understood that compared with the passive control method of the fan with a long process duration and complex operation in the related art, the control method proposed by the present invention has a shorter duration, simpler operation and higher accuracy.

[0062] It should be noted that the above target pressure parameter does not specifically refer to the pressure of the compressor 1, and may also include parameters such as the saturation temperature corresponding to the pressure of the compressor 1. The present invention does not make special limitations here, as long as the parameter has a specific corresponding relationship with the pressure of the compressor 1.

[0063] For example, in a specific embodiment, the target pressure parameter includes the target high-pressure parameter and the target low-pressure parameter of the compressor 1, and the target high-pressure parameter includes the target high-pressure or the target high-pressure saturation temperature of the compressor 1, and the target low-pressure parameter includes the target low-pressure or the target low-pressure saturation temperature of the compressor 1.

[0064] It can be understood that the above target high-pressure saturation temperature refers to the saturation temperature corresponding to the target high-pressure, and the above target low-pressure saturation temperature refers to the saturation temperature corresponding to the target low-pressure.

[0065] According to some embodiments of the present invention, when the current working mode of the heat pump system is different, the controller generates different control logics, so as to process the outdoor ambient temperature and the target water outlet temperature under different control logics, and then specifically obtain the target pressure parameter of the compressor 1 in the current working mode.

[0066] For example, when the current working mode of the heat pump system is the refrigeration mode, the controller generates the first control logic. Under the first control logic, the controller processes the outdoor ambient temperature and the target water outlet temperature to calculate the target pressure parameter of the compressor 1 in the refrigeration mode.

[0067] Again, for example, when the current working mode of the heat pump system is the heating mode, the controller generates the second control logic. Under the second control logic, the controller processes the outdoor ambient temperature and the target water outlet temperature to calculate the target pressure parameter of the compressor 1 in the heating mode.

[0068] Next, the specific determination method of the target pressure parameter when the current working mode of the heat pump system is the heating mode will be introduced first.

[0069] According to some embodiments of the present invention, the step of determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter specifically includes:

[0070] Determine that the current working mode is the heating mode;

[0071] In the heating mode, determine the target high-pressure pressure parameter of the compressor 1 according to the target water outlet temperature;

[0072] In the heating mode, determine the target low-pressure pressure parameter of the compressor 1 according to the outdoor ambient temperature;

[0073] Adjust the working parameters of the compressor 1 according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

[0074] It can be understood that in the heating mode of the heat pump system, the high-pressure pressure parameter (such as high-pressure pressure or high-pressure pressure saturation temperature) of the compressor 1 is closely related to the heating power of the compressor 1, and the heating power of the compressor 1 determines the magnitude of the target water outlet temperature. Therefore, when the heat pump system is currently in the heating mode, the high-pressure pressure parameter of the compressor 1 is closely related to the target water outlet temperature set by the system. In this way, by analyzing the target water outlet temperature in the heating mode, this method can accurately obtain the high-pressure pressure parameter adapted to the current target water outlet temperature, that is, the target high-pressure pressure parameter.

[0075] Furthermore, in the heating mode of the heat pump system, the influence of the external environment on the low-pressure pressure parameter of the compressor 1 is relatively large. Therefore, when the heat pump system is currently in the heating mode, the low-pressure pressure parameter of the compressor 1 is closely related to the outdoor ambient temperature. For example, the lower the outdoor ambient temperature, the lower the low-pressure pressure of the heat pump system. In this way, by analyzing the current outdoor ambient temperature of the outdoor environment, this method can accurately obtain the low-pressure pressure parameter adapted to the current outdoor ambient temperature, that is, the target low-pressure pressure parameter.

[0076] In some specific embodiments of the present invention, in the step of determining the target high-pressure pressure parameter of the compressor 1 according to the target water outlet temperature in the heating mode: the target high-pressure pressure parameter is positively correlated with the target water outlet temperature.

[0077] For example Figure 2 As shown, in the step of determining the target high-pressure pressure parameter of the compressor 1 according to the target water outlet temperature in the heating mode, specifically includes:

[0078] In the heating mode, if the target water outlet temperature is Tset, then the determined target high-pressure pressure protection temperature Pd_t is: Pd_t = Tset + α (α is a constant).

[0079] It should be noted that the above-mentioned α is a constant, which is generally related to the configuration of the heat pump system and its specific value can be determined according to experimental tests.

[0080] In some specific embodiments of the present invention, in the heating mode, the steps of determining the target low-pressure pressure parameter of the compressor 1 according to the outdoor ambient temperature specifically include:

[0081] When the outdoor ambient temperature is less than the first set temperature, it is determined that the target low-pressure pressure saturation temperature of the compressor 1 is the first low temperature;

[0082] When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, it is determined that the target low-pressure pressure saturation temperature of the compressor 1 is the second low temperature;

[0083] When the outdoor ambient temperature is greater than or equal to the second set temperature, it is determined that the target low-pressure pressure saturation temperature of the compressor 1 is the third low temperature.

[0084] Among them, the first low temperature is greater than the second low temperature, the second low temperature is greater than or equal to the third low temperature, and the first low temperature, the second low temperature and the third low temperature are respectively positively correlated with the outdoor ambient temperature.

[0085] For example Figure 2 As shown, assuming that the target low-pressure pressure saturation temperature is marked as Ps_t and the outdoor ambient temperature is marked as Tao, the relationship between the target low-pressure pressure saturation temperature Ps_t and the outdoor ambient temperature Tao is as follows:

[0086] When Tao < 0°C, Ps_t = Tao - 3°C;

[0087] When 0 ≤ Tao < 20°C, Ps_t = Tao - 3 - Tao / 10°C;

[0088] When 20 ≤ Tao°C, Ps_t = Tao - 5 - (Tao - 20) / 5°C.

[0089] Next, the specific method for determining the target pressure parameter when the current working mode of the heat pump system is the cooling mode will be introduced first.

[0090] According to some embodiments of the present invention, the steps of determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter specifically include:

[0091] Determine that the current working mode is the cooling mode;

[0092] In the cooling mode, determine the target low-pressure pressure parameter of the compressor 1 according to the target water outlet temperature;

[0093] In the refrigeration mode, the target high-pressure pressure parameter of the compressor 1 is determined according to the outdoor ambient temperature;

[0094] The operating parameters of the compressor 1 are adjusted according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

[0095] It can be understood that in the refrigeration mode of the heat pump system, the low-pressure pressure parameter (such as the low-pressure pressure or the low-pressure pressure saturation temperature) of the compressor 1 is closely related to the refrigeration power of the compressor 1, and the refrigeration power of the compressor 1 determines the size of the target outlet water temperature. Therefore, when the heat pump system is currently in the refrigeration mode, the low-pressure pressure parameter of the compressor 1 is closely related to the target outlet water temperature set by the system. In this way, by analyzing the target outlet water temperature in the refrigeration mode, this method can accurately obtain the low-pressure pressure parameter adapted to the current target outlet water temperature, that is, the target low-pressure pressure parameter.

[0096] Furthermore, in the refrigeration mode of the heat pump system, the influence of the external environment on the high-pressure pressure parameter of the compressor 1 is relatively large. Therefore, when the heat pump system is currently in the refrigeration mode, the high-pressure pressure parameter of the compressor 1 is closely related to the outdoor ambient temperature. For example, the higher the outdoor ambient temperature, the higher the high-pressure pressure of the heat pump system. In this way, by analyzing the current outdoor ambient temperature of the outdoor environment, this method can accurately obtain the high-pressure pressure parameter adapted to the current outdoor ambient temperature, that is, the target high-pressure pressure parameter.

[0097] In some embodiments of the present invention, in the step of determining the target low-pressure pressure parameter of the compressor 1 according to the target outlet water temperature in the refrigeration mode: the target low-pressure pressure parameter of the compressor 1 is positively correlated with the target outlet water temperature.

[0098] For example Figure 2 As shown, in the step of determining the target low-pressure pressure parameter of the compressor 1 according to the target outlet water temperature in the refrigeration mode, it specifically includes:

[0099] In the refrigeration mode, if the target outlet water temperature is Tset, then the determined target low-pressure pressure protection temperature Ps_t is: Ps_t = Tset - β (β is a constant).

[0100] It should be explained that the above β is a constant, which is generally related to the configuration of the heat pump system and its specific value can be determined according to experimental tests.

[0101] In some specific embodiments of the present invention, in the step of determining the target high-pressure pressure parameter of the compressor 1 according to the outdoor ambient temperature in the refrigeration mode, it specifically includes:

[0102] When the outdoor ambient temperature is less than the third set temperature, the target high-pressure pressure saturation temperature of the compressor 1 is determined to be the first high temperature;

[0103] When the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, the target high-pressure pressure saturation temperature of the compressor 1 is determined to be the second high temperature;

[0104] When the outdoor ambient temperature is greater than or equal to the fourth set temperature, the target high-pressure pressure saturation temperature of the compressor 1 is determined to be the third high temperature.

[0105] Among them, the second high temperature and the third high temperature are both greater than the first high temperature, and the first high temperature, the second high temperature and the third high temperature are respectively positively correlated with the outdoor ambient temperature.

[0106] For example Figure 2 As shown, assuming that the target high-pressure pressure saturation temperature is marked as Pd_t and the outdoor ambient temperature is marked as Tao, the relationship between the target high-pressure pressure saturation temperature Pd_t and the outdoor ambient temperature Tao is as follows:

[0107] When Tao < 10°C, Pd_t = Tao + 10°C;

[0108] When 10 ≤ Tao < 35°C, Pd_t = Tao + 10 + (Tao - 10) / 10°C;

[0109] When 35 ≤ Tao°C, Pd_t = Tao + 10 + (Tao - 35) / 5°C.

[0110] It should be noted that although the above embodiments use the saturation temperatures corresponding to the high and low pressures for target setting, the control method of the present invention can also use other temperatures such as the water outlet temperature of the unit or directly use the high and low pressures for setting, and the solution effect of the present invention can be achieved.

[0111] In addition, in the above embodiments, the relationship between the heating Ps_t / cooling Pd_t and Tao only serves as an example and does not constitute a specific limitation. The relationship between the above heating Ps_t / cooling Pd_t and Tao can also be other forms. Further, as long as the high and low pressure control, the water outlet temperature control, the suction and exhaust control, etc. are used to achieve the purpose of the present invention, they all belong to the protection points of the present case.

[0112] According to some embodiments of the present invention, after the step of determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter, the control method of the heat pump system further includes:

[0113] According to the target pressure parameter and the specifications of the compressor 1, control and adjust the frequency of the compressor 1 and / or the opening degree of the electronic expansion valve.

[0114] For example, in the heating mode, since the high and low pressure parameters of the system have been set for heating, the system selects an appropriate frequency and the corresponding opening degree of the electronic expansion valve according to Ps_t and Pd_t, combined with the specification of the compressor 1 to ensure the flow rate. At this time, the system can quickly achieve a heating balance.

[0115] Another example is that since the high and low pressure parameters of the system have been set for refrigeration, the system selects an appropriate frequency and the corresponding opening degree of the electronic expansion valve according to Ps_t and Pd_t, combined with the specification of the compressor 1 to ensure the flow rate. At this time, the system can quickly achieve a refrigeration balance.

[0116] The control device of the heat pump system provided by the present invention will be described below. The control device of the heat pump system described below can be mutually corresponding and referred to the control method of the heat pump system described above.

[0117] As Figure 3 shown, the control device of the heat pump system according to the second aspect embodiment of the present invention includes:

[0118] An acquisition module 110, configured to acquire the current working mode and the outdoor ambient temperature of the heat pump system, and acquire the target outlet water temperature of the heat pump system in the current working mode;

[0119] A control module 120, configured to determine the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target outlet water temperature, and the outdoor ambient temperature, and adjust the compressor 1 to the target pressure parameter.

[0120] As Figure 4 shown, the heat pump system according to the third aspect embodiment of the present invention includes a compressor 1, a four-way valve 2, a throttling device 4, a water-fluorine heat exchanger 5, a water pump 6, and an outdoor heat exchanger 3, and further includes the control device of the heat pump system described in the second aspect embodiment of the present invention.

[0121] Among them, in the heat pump system, a complete heating cycle is that the refrigerant flows from the compressor 1 through the four-way valve 2 to the water-fluorine heat exchanger 5, then enters the outdoor heat exchanger 3 through the throttling device 4, and then flows back to the compressor 1 through the four-way valve 2, thereby completing a complete heating cycle.

[0122] A complete refrigeration cycle is that the refrigerant flows from the compressor 1 through the four-way valve 2 to the outdoor heat exchanger 3, then passes through the throttling device 4 and enters the water-fluorine heat exchanger 5, and then flows back to the compressor 1 through the four-way valve 2, thereby completing a complete refrigeration cycle.

[0123] The heat pump system and its control device according to the embodiments of the present invention can quickly determine the target pressure parameter required by the compressor 1 currently by establishing a relational expression in which the outdoor ambient temperature and the target water outlet temperature are respectively associated with the target pressure parameter. Furthermore, the system can quickly reach a balance, greatly reducing the system self-adjustment time.

[0124] Figure 5 An example of the physical structure diagram of an electronic device is shown as Figure 5 shown. The electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communications interface 820, and the memory 830 complete the communication with each other through the communication bus 840. The processor 810 can call the logic instructions in the memory 830 to execute the control method of the heat pump system. The method includes: obtaining the current working mode and the outdoor ambient temperature of the heat pump system, and obtaining the target water outlet temperature of the heat pump system in the current working mode; determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter.

[0125] In addition, when the logic instructions in the above-mentioned memory 830 are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0126] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the heat pump system provided by each of the above methods. The method includes: obtaining the current working mode and the outdoor ambient temperature of the heat pump system, and obtaining the target water outlet temperature of the heat pump system in the current working mode; determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter.

[0127] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method of the heat pump system provided by each of the above methods. The method includes: obtaining the current working mode and the outdoor ambient temperature of the heat pump system, and obtaining the target water outlet temperature of the heat pump system in the current working mode; determining the target pressure parameter of the compressor 1 of the heat pump system according to the current working mode, the target water outlet temperature, and the outdoor ambient temperature, and adjusting the compressor 1 to the target pressure parameter.

[0128] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0129] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, it includes: Obtain the current working mode of the heat pump system and the outdoor ambient temperature, and obtain the target water outlet temperature of the heat pump system in the current working mode; According to the current working mode, the target water outlet temperature and the outdoor ambient temperature, determine the target pressure parameter of the compressor of the heat pump system, and adjust the compressor to the target pressure parameter.

2. The control method for a heat pump system according to claim 1, characterized in that, The target pressure parameter includes the target high-pressure pressure parameter and the target low-pressure pressure parameter of the compressor, and the target high-pressure pressure parameter includes the target high-pressure pressure or the target high-pressure pressure saturation temperature of the compressor, and the target low-pressure pressure parameter includes the target low-pressure pressure or the target low-pressure pressure saturation temperature of the compressor.

3. The control method for a heat pump system according to claim 2, characterized in that, The step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter specifically includes: Determine that the current working mode is the heating mode; In the heating mode, determine the target high-pressure pressure parameter of the compressor according to the target water outlet temperature; In the heating mode, determine the target low-pressure pressure parameter of the compressor according to the outdoor ambient temperature; Adjust the working parameters of the compressor according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

4. The control method for a heat pump system according to claim 3, characterized in that, The step of determining the target high-pressure pressure parameter of the compressor according to the target water outlet temperature in the heating mode specifically includes: In the heating mode, if the target water outlet temperature is Tset, then determine that the target high-pressure pressure protection temperature Pd_t is: Pd_t = Tset + α (α is a constant).

5. The control method for a heat pump system according to claim 3, characterized in that, The step of determining the target low-pressure pressure parameter of the compressor according to the outdoor ambient temperature in the heating mode specifically includes: When the outdoor ambient temperature is less than the first set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the first low-pressure temperature; When the outdoor ambient temperature is greater than or equal to the first set temperature and less than the second set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the second low-pressure temperature; When the outdoor ambient temperature is greater than or equal to the second set temperature, determine that the target low-pressure pressure saturation temperature of the compressor is the third low-pressure temperature; Wherein, the first low-pressure temperature is greater than the second low-pressure temperature, the second low-pressure temperature is greater than or equal to the third low-pressure temperature, and the first low-pressure temperature, the second low-pressure temperature and the third low-pressure temperature are respectively positively correlated with the outdoor ambient temperature.

6. The control method for a heat pump system according to any one of claims 2 to 5, It is characterized in that the step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter specifically includes: determining that the current working mode is the refrigeration mode; in the refrigeration mode, determining the target low-pressure pressure parameter of the compressor according to the target water outlet temperature; in the refrigeration mode, determining the target high-pressure pressure parameter of the compressor according to the outdoor ambient temperature; adjusting the working parameters of the compressor according to the target high-pressure pressure parameter and the target low-pressure pressure parameter.

7. The control method of the heat pump system according to claim 6, It is characterized in that the step of determining the target low-pressure pressure parameter of the compressor according to the target water outlet temperature in the refrigeration mode specifically includes: in the refrigeration mode, if the target water outlet temperature is Tset, then the determined target low-pressure pressure protection temperature Ps_t is: Ps_t = Tset - β (β is a constant).

8. The control method of the heat pump system according to claim 6, It is characterized in that the step of determining the target high-pressure pressure parameter of the compressor according to the outdoor ambient temperature in the refrigeration mode specifically includes: when the outdoor ambient temperature is less than the third set temperature, determining that the target high-pressure pressure saturation temperature of the compressor is the first high temperature; when the outdoor ambient temperature is greater than or equal to the third set temperature and less than the fourth set temperature, determining that the target high-pressure pressure saturation temperature of the compressor is the second high temperature; when the outdoor ambient temperature is greater than or equal to the fourth set temperature, determining that the target high-pressure pressure saturation temperature of the compressor is the third high temperature; wherein, the second high temperature and the third high temperature are both greater than the first high temperature, and the first high temperature, the second high temperature and the third high temperature are respectively positively correlated with the outdoor ambient temperature.

9. The control method of the heat pump system according to any one of claims 1 to 5, It is characterized in that after the step of determining the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjusting the compressor to the target pressure parameter, it further includes: controlling and adjusting the frequency of the compressor and / or the opening degree of the electronic expansion valve according to the target pressure parameter and the specification of the compressor.

10. A control device of a heat pump system, It is characterized in that comprises: an acquisition module, configured to acquire the current working mode and the outdoor ambient temperature of the heat pump system, and acquire the target water outlet temperature of the heat pump system in the current working mode; a control module, configured to determine the target pressure parameter of the compressor of the heat pump system according to the current working mode, the target water outlet temperature and the outdoor ambient temperature, and adjust the compressor to the target pressure parameter.

11. A heat pump system, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, when the processor executes the program, it implements the control method of the heat pump system according to any one of claims 1 to 9.

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