Dual-stage jet enthalpy increase heat pump system control method, device, air conditioner and medium

Abstract

The present application discloses a control method, device, air conditioner and medium for a two-stage jet enthalpy-increasing heat pump system. The method obtains an outdoor temperature time prediction sequence of the heat pump system within a target operation duration; determines a control period of the heat pump system and a corresponding continuous control time of the control period according to the outdoor temperature time prediction sequence; determines an average outdoor temperature within the control period according to the outdoor temperature time prediction sequence and the continuous control time; determines a first target opening degree of a first-stage electronic expansion valve and a second target opening degree of a second-stage electronic expansion valve corresponding to the control period according to the average outdoor temperature and the continuous control time, and controls the two-stage jet enthalpy-increasing heat pump system with the first target opening degree and the second target opening degree; through the technical solution provided by the present application, the energy efficiency of the two-stage jet enthalpy-increasing heat pump system can be improved while the stability of the system is enhanced. The present application can be widely applied to the technical field of heat pump system control.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump system control, and in particular to a control method, device, air conditioner and medium for a two-stage jet enthalpy-increasing heat pump system. Background Art

[0002] An air-source heat pump air conditioner is an air conditioner that uses air as a low-temperature heat source, drives a compressor to operate through electric energy, moves the heat energy in the air from the low-grade side to the high-grade side, and thus provides heating for users. In low-temperature and ultra-low-temperature environments, due to situations such as too low evaporation temperature and too high exhaust temperature of the heat pump air conditioner, the heating capacity of the unit decays, which in turn affects the heating effect. In existing heat pump air conditioner solutions, a two-stage jet enthalpy-increasing heat pump system is proposed to solve the problem of low-temperature heating of the heat pump.

[0003] However, on the one hand, there are large differences in the system energy efficiency of the two-stage jet enthalpy-increasing heat pump system under different outdoor environmental conditions; on the other hand, when the opening degree of the electronic expansion valve changes too quickly, it will have a greater impact on the stability of the two-stage jet enthalpy-increasing system. Therefore, the problems existing in the related technologies need to be solved urgently. Summary of the Invention

[0004] The purpose of the present application is to solve at least to some extent one of the technical problems existing in the prior art.

[0005] In an embodiment of the present application, a control method, air conditioner and medium for a two-stage jet enthalpy-increasing heat pump system are provided. This technical solution can improve the energy efficiency of the two-stage jet enthalpy-increasing heat pump system and at the same time improve the stability of the two-stage jet enthalpy-increasing heat pump system.

[0006] According to one aspect of the embodiments of the present application, a control method for a two-stage jet enthalpy-increasing heat pump system is provided. The heat pump system includes a first-stage electronic expansion valve and a second-stage electronic expansion valve. The control method for the two-stage jet enthalpy-increasing heat pump system includes the following steps: obtaining an outdoor temperature time prediction sequence of the heat pump system within a target operation duration; the outdoor temperature time prediction sequence is a sequence formed by arranging the numerical values of the outdoor temperature in the order of measurement time within a future set time period; determining the control period of the heat pump system and the corresponding continuous control time according to the outdoor temperature time prediction sequence; determining the average outdoor temperature within the control period according to the outdoor temperature time prediction sequence and the continuous control time; determining a first target opening degree of the first-stage electronic expansion valve and a second target opening degree of the second-stage electronic expansion valve corresponding to the control period according to the average outdoor temperature and the continuous control time, and controlling the two-stage jet enthalpy-increasing heat pump system with the first target opening degree and the second target opening degree.

[0007] In the embodiments of the present application, the control method can combine the running time and the outdoor temperature sequence within the corresponding running time, comprehensively consider the influence of different temperatures of the heat pump system during the running time, control the heat pump system, and enable the heat pump system to always operate at the target opening degree during the running time, which can improve the energy efficiency of the two-stage jet enthalpy-increasing heat pump system and at the same time improve the stability of the two-stage jet enthalpy-increasing heat pump system.

[0008] In addition, according to the control method of the two-stage jet enthalpy-increasing heat pump system in the above embodiments of the present application, the following additional technical features may also be provided:

[0009] Optionally, in an embodiment of the present application, the step of determining the control period of the heat pump system and the corresponding continuous control time of the control period according to the outdoor temperature time forecast sequence includes: determining the temperature change rate of the first outdoor temperature at any moment within the target running duration relative to the second outdoor temperature corresponding to the previous adjacent moment of the any moment according to the outdoor temperature time forecast sequence; determining the target start time and the target end time of the target running time from the outdoor temperature time forecast sequence, and determining each control period included in the outdoor temperature time forecast sequence and the corresponding continuous control time of each control period according to the temperature change rate.

[0010] Optionally, in an embodiment of the present application, the step of determining the temperature change rate of the outdoor temperature at any moment within the target running duration relative to the previous adjacent moment corresponding to the any moment according to the outdoor temperature time forecast sequence includes: obtaining the first outdoor temperature at any moment within the target running duration and the second outdoor temperature corresponding to the previous adjacent moment of the any moment from the outdoor temperature time forecast sequence; determining the temperature difference of the outdoor temperature according to the first outdoor temperature and the second outdoor temperature; obtaining the ratio of the absolute value of the temperature difference to the second outdoor temperature as the temperature change rate.

[0011] Optionally, in an embodiment of the present application, the step of determining the target start time and the target end time corresponding to the outdoor temperature from the outdoor temperature time forecast sequence, and determining each control period included in the outdoor temperature time forecast sequence and the corresponding continuous control time of each control period according to the temperature change rate includes: for any target moment within the target running time, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control periods and determining the continuous control time of the control period according to the magnitude relationship between the target temperature change rate and the target threshold.

[0012] Optionally, in an embodiment of the present application, the step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold includes: when it is determined that the target temperature change rate is greater than or equal to the target threshold, incrementing the number of control cycles by one, determining the continuous control time of the control cycle as the difference between the current target moment and the previous target moment, and determining the current target moment as the new previous target moment; when it is determined that the target temperature change rate is less than the target threshold, keeping the number of control cycles unchanged and determining the current target moment as the end moment of the previous control cycle.

[0013] Optionally, in an embodiment of the present application, the step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold further includes:

[0014] If it is determined that the temperature change rates of all target end moments within the target operation duration are less than the target threshold, then within the target operation duration, adjust the control cycle to 1 and adjust the continuous control time of the control cycle to the target operation duration.

[0015] Optionally, in an embodiment of the present application, the step of determining the outdoor average temperature of the control cycle according to the outdoor temperature time prediction sequence and the continuous control time includes: determining the start moment and the end moment of the continuous control time; determining the outdoor temperature time prediction subsequence within the continuous control time according to the start moment and the end moment; determining the outdoor average temperature of the control cycle according to the outdoor temperature time prediction subsequence.

[0016] Optionally, in an embodiment of the present application, the step of determining the outdoor average temperature of the control cycle according to the outdoor temperature time prediction subsequence includes: determining the sub - temperatures within the control cycle of the outdoor temperature time prediction subsequence and the quantities corresponding to the sub - temperatures; determining the outdoor average temperature of the control cycle according to the sub - temperatures and the quantities corresponding to the sub - temperatures.

[0017] Optionally, in an embodiment of the present application, the step of obtaining the outdoor temperature time prediction sequence of the heat pump system within the target operation duration specifically includes: using the start time of the heat pump system as the starting point of the outdoor temperature time prediction sequence, and using the moment corresponding to the sum of the start time of the heat pump system and the target operation time as the end time, and obtaining the outdoor temperature of the heat pump system and the measurement moment corresponding to the outdoor temperature at preset intervals, so as to obtain the outdoor temperature time prediction sequence.

[0018] According to another aspect of the embodiments of the present application, there is provided a control device for a two-stage jet enthalpy-increasing heat pump system, including:

[0019] An acquisition module, configured to acquire the outdoor temperature time prediction sequence of the heat pump system within the target operation duration; the outdoor temperature time prediction sequence is a sequence formed by arranging the numerical values of the outdoor temperature in the order of the measurement time within a set future time period;

[0020] A first determination module, configured to determine the control period of the heat pump system and the corresponding continuous control time of the control period according to the outdoor temperature time prediction sequence;

[0021] A second determination module, configured to determine the average outdoor temperature within the control period according to the outdoor temperature time prediction sequence and the continuous control time;

[0022] A control module, configured to determine the first target opening degree of the first-stage electronic expansion valve and the second target opening degree of the second-stage electronic expansion valve corresponding to the control period according to the average outdoor temperature and the continuous control time, and control the two-stage jet enthalpy-increasing heat pump system with the first target opening degree and the second target opening degree.

[0023] According to another aspect of the embodiments of the present application, there is provided a control device for a two-stage jet enthalpy-increasing heat pump system, including: at least one processor; at least one memory, configured to store at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the control method of the two-stage jet enthalpy-increasing heat pump system described in any one of the foregoing.

[0024] According to another aspect of the embodiments of the present application, there is provided an air conditioner, including the control device for a two-stage jet enthalpy-increasing heat pump system described above.

[0025] According to another aspect of the embodiments of the present application, there is provided a computer-readable storage medium, in which a program executable by a processor is stored, and the program executable by the processor implements the method described above when executed by the processor.

[0026] The advantages and beneficial effects of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application:

[0027] The technical solution provided by the embodiment of the present application can obtain the outdoor temperature time forecast sequence at future moments corresponding to the target operation duration that the heat pump system is to operate. Through the outdoor temperature time forecast sequence, the control period of the heat pump system and the continuous control time corresponding to each control period can be obtained. Through the outdoor temperature time forecast sequence and the continuous control time, the average outdoor temperature of the control period can be obtained. Through the average outdoor temperature and the continuous control time of the control period, the opening degrees of the first-stage electronic expansion valve and the second electronic expansion valve corresponding to each control period can be determined. Finally, the heat pump is controlled with their respective target opening degrees. This control scheme can combine the operation time and the outdoor temperature sequence during the corresponding operation time, comprehensively consider the influence of different temperatures of the heat pump system during the operation time, control the heat pump system, and enable the heat pump system to always operate with the target opening degree during the operation time, which can improve the energy efficiency of the two-stage jet enthalpy-increasing heat pump system and at the same time improve the stability of the two-stage jet enthalpy-increasing heat pump system. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following introduces the drawings of the related technical solutions in the embodiments of the present application or the prior art. It should be understood that the drawings introduced below are only for conveniently and clearly expressing some embodiments of the technical solutions in the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is a schematic structural diagram of a two-stage jet enthalpy-increasing heat pump system in the related art;

[0030] Figure 2 is a schematic flowchart of a control method for a two-stage jet enthalpy-increasing heat pump system provided in an embodiment of the present application;

[0031] Figure 3 is a schematic flowchart of determining the control period of the heat pump system and the continuous control time corresponding to the control period according to the outdoor temperature time forecast sequence in a control method for a two-stage jet enthalpy-increasing heat pump system provided in an embodiment of the present application;

[0032] Figure 4 is a schematic flowchart of determining the temperature change rate of the outdoor temperature at any moment within the target operation duration relative to the temperature at the previous adjacent moment corresponding to the any moment according to the outdoor temperature time forecast sequence in a control method for a two-stage jet enthalpy-increasing heat pump system provided in an embodiment of the present application;

[0033] Figure 5 It is a schematic flow chart for obtaining the target temperature change rate corresponding to the target moment in the embodiments of the present application, adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold;

[0034] Figure 6 It is a schematic flow chart for determining the outdoor average temperature of the control cycle according to the outdoor temperature time forecast sequence and the continuous control time in the embodiments of the present application;

[0035] Figure 7 It is a schematic structural diagram of a two-stage jet enthalpy-increasing heat pump system control device provided in the embodiments of the present application;

[0036] Figure 8 It is a schematic structural diagram of another two-stage jet enthalpy-increasing heat pump system control device provided in the embodiments of the present application. Detailed implementation manners

[0037] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0038] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0039] The following describes the technical defects existing in the prior art in conjunction with the accompanying drawings:

[0040] An air-source heat pump air conditioner is an air conditioner that uses air as a low-temperature heat source, drives a compressor to operate through electric energy, moves the heat energy in the air from the low-grade side to the high-grade side, and thus provides heating for users. Heat pump air conditioners have characteristics such as high efficiency and environmental protection. However, in low-temperature and ultra-low-temperature environments, due to situations such as too low evaporation temperature and too high exhaust temperature in heat pump air conditioners, the heating capacity of the unit decays, which in turn affects the heating effect. In existing heat pump air conditioner solutions, there are also proposals to use a two-stage ejector-enhanced heat pump system to solve the problem of low-temperature heating of heat pumps.

[0041] Referring to Figure 1 , an existing two-stage ejector-enhanced heat pump system may include components such as an indoor heat exchanger (condenser) 101, an outdoor heat exchanger 102, a primary economizer 103, a first-stage electronic expansion valve 104 of the primary economizer, a secondary economizer 105, a second-stage electronic expansion valve 106 of the secondary economizer, a main electronic expansion valve 107 (outdoor electronic expansion valve), a compressor 108, etc. A heat exchanger is a device used to transfer heat from a hot fluid to a cold fluid to meet the specified process requirements, and it is an industrial application of convective heat transfer and heat conduction. Heat exchangers can be classified in different ways. According to their operating processes, they can be divided into three categories: shell-and-tube type, mixed type, and regenerative type (or recuperative type); according to the compactness of their surfaces, they can be divided into two categories: compact type and non-compact type. Using an indoor heat exchanger can quickly achieve energy exchange and improve efficiency.

[0042] However, in related technologies, there are also certain limitations in using a two-stage ejector-enhanced heat pump system; on the one hand, there are large differences in the system energy efficiency of a two-stage ejector-enhanced heat pump under different outdoor environmental conditions. These differences will not only affect the energy efficiency of the heat pump system, causing waste of electric power resources, but also increase the instability of the heat pump system control. How to adjust the optimal operating range of each stage of the electronic expansion valve according to different outdoor environmental conditions so that the system is always in a state of better energy efficiency is the difficulty of controlling a two-stage ejector-enhanced heat pump; on the other hand, when the opening degree of the electronic expansion valve changes rapidly, it will not only affect the energy consumption of the two-stage ejector-enhanced system, but also have a greater impact on the stability of the two-stage ejector-enhanced system, and problems such as liquid return are likely to occur. Therefore, when the two-stage ejector-enhanced heat pump system is operating, if the outdoor temperature changes greatly, it is difficult to ensure the energy efficiency and reliability of the heat pump system operation.

[0043] To address the above problems, referring to Figure 2 , an embodiment of the present application provides a control method for a two-stage ejector-enhanced heat pump system, which may include the following steps:

[0044] S100. Obtain the outdoor temperature time prediction sequence of the heat pump system within the target operation duration;

[0045] In this step, the outdoor temperature time prediction sequence can be a sequence obtained by arranging outdoor temperatures in chronological order of measurement within a set future time period, or a sequence obtained by arranging outdoor temperatures in chronological order of measurement within a set future time period including the initial moment when the heat pump starts or operates; specifically, if the current heat pump startup time or heat pump operation time is a o'clock in Beijing time and the set future time period is 4 hours, the outdoor temperature time prediction sequence can be a time sequence of outdoor temperatures arranged in chronological order starting from a o'clock for the next 4 hours. The target operation duration can be the operation duration preset for the heat pump system, such as 4 hours, 2 hours, or any other arbitrary time length. In some embodiments, the time difference between the moment corresponding to the first temperature and the moment corresponding to the last temperature in the outdoor temperature time prediction sequence can be the same as the target operation time. In other embodiments, the time difference between the moment corresponding to the first temperature and the moment corresponding to the last temperature in the outdoor temperature time prediction sequence can differ from the target operation time by a preset time difference, that is, the outdoor temperature corresponding to the start time of operation is not included in the temperature time prediction sequence, and within the target operation time of N hours, the time difference between any two adjacent moments in the outdoor temperature time prediction sequence can be a fixed value, which can be 1 hour. That is to say, in some embodiments of the present application, with the heat pump system startup moment as 0 o'clock, the outdoor temperature sequence can be a temperature time prediction sequence composed of the temperature a measured at 1 o'clock, the temperature b measured at 2 o'clock, the temperature c measured at 3 o'clock, and the temperature n measured at N o'clock, with measurements taken every 1 hour. Exemplarily, in some embodiments of the present application, the time difference between any two adjacent moments in the outdoor temperature time prediction sequence can be 30 minutes. That is to say, within the target operation time of N hours, with the heat pump system startup moment as 0 o'clock, the outdoor temperature sequence can be a temperature time prediction sequence composed of the temperature 1 measured at 0:30, the temperature 2 measured at 1 o'clock, and the temperature 3 measured at 1:30, with measurements taken every half hour until the temperature 2n measured at N hours; in addition, in some embodiments of the present application, the acquisition of the outdoor temperature time prediction sequence can be the outdoor temperature time prediction sequence obtained by the heat pump system within a short time, such as within a few minutes, specifically obtained by networking with the upper computer or the local weather forecast system, or by networking with a mobile phone or other portable devices with weather prediction functions; through these methods, the corresponding outdoor temperature time prediction sequence can be quickly obtained, facilitating subsequent processing of temperature and time data, improving the processing speed of heat pump system data, and thus improving the system response speed.

[0046] S200. Determine the control period of the heat pump system and the corresponding continuous control time according to the outdoor temperature time prediction sequence;

[0047] In this step, since the outdoor temperature-time forecast sequence already covers all the temperature values measured at every fixed time interval within the operating time of the heat pump system and the measurement times corresponding to all the temperature values; in this step, it is possible to determine which control cycle each control cycle of the heat pump system is through the temperature values and the measurement times. At the same time, it is also possible to determine the continuous control time of the corresponding control cycle. The minimum number of control cycles is 1, and the maximum number is the number of temperatures corresponding to the temperature-time forecast sequence. For example, within the operating time, if the temperature-time forecast sequence includes N temperature values, then the corresponding maximum number of control cycles can be N, and the longest continuous control time of the corresponding cycle is the time corresponding to the operating time. The shortest continuous control time of the corresponding cycle is the difference between any two adjacent times in the temperature-time forecast sequence, and the shortest continuous control time is the target operating time. In this step, the control cycles of the two-stage heat pump system and the corresponding continuous control times of the corresponding control cycles can be quickly determined through the outdoor temperature-time forecast sequence, which can improve the data processing speed of the heat pump system and thus improve the response speed of the system.

[0048] S300. Determine the average outdoor temperature within the control cycle according to the outdoor temperature-time forecast sequence and the continuous control time;

[0049] In this step, since the continuous control time of the control cycle of the two-stage jet-increased enthalpy heat pump system can reflect the start point and the end point of the corresponding control cycle. In some embodiments of the present application, a control cycle may include any two consecutive temperatures in the temperature-time forecast sequence. At this time, the average temperature of the corresponding control cycle is the average value of any two consecutive temperatures. For example, if the control cycle is the two consecutive temperatures a1 and a2 corresponding to the time from moment A to moment B, then the average outdoor temperature within the control cycle at this time is (a1 + a2) / 2. In other embodiments of the present application, a control cycle may include any number of consecutive temperatures in the temperature-time forecast sequence; at this time, the average temperature of the corresponding control cycle is the average value of the multiple consecutive temperatures. For example, if the control cycle is the multiple consecutive temperatures corresponding to the time from moment A to moment C, which are a1 corresponding to moment A, a2 corresponding to moment B, and a3 corresponding to moment C respectively, then the average outdoor temperature within the control cycle at this time can be (a1 + a2 + a3) / 3; correspondingly, when the control cycle is from moment A to moment D, the average outdoor temperature within the control cycle can be (a1 + a2 + a3 + a4) / 4. The data processing process is the same as that of the above embodiments and will not be elaborated here. In summary, in this step, the average outdoor temperature within the control cycle can be obtained quickly and simply, which can improve the data processing speed and simplify the control process.

[0050] S400. Determine a first target opening degree of the first-stage electronic expansion valve and a second target opening degree of the second-stage electronic expansion valve corresponding to the control period according to the average outdoor temperature and the continuous control time, and control the two-stage jet-increased enthalpy heat pump system with the first target opening degree and the second target opening degree;

[0051] In this step, the first target opening degree and the second target opening degree may be the opening degrees of the heat pump system under the optimal energy efficiency ratio. This step may be based on a preset heat pump system performance model F, which can be used to estimate the energy efficiency ratio of the heat pump operating at different outdoor environmental temperatures and different opening degrees of the electronic expansion valve. In each determined control period, according to the average outdoor temperature, with the goal of maximizing the energy efficiency ratio within the control period, determine the first target opening degree of the first-stage electronic expansion valve of the first-stage economizer and the second target opening degree of the second-stage electronic expansion valve of the second-stage economizer. Finally, operate the heat pump system with the best opening degree of the current period in each control period. Further, in some embodiments of the present application, the method for determining the optimal opening degree combination is as follows: for the i-th control period, within the controllable range of the first-stage electronic expansion valve and the second-stage electronic expansion valve, set multiple sets of permutations and combinations of the opening degrees of the first-stage valve and the second-stage valve, and then use the preset model F to estimate the energy efficiency ratio when operating with different valve opening degree combinations within this period; input the average outdoor temperature of the i-th control period into the preset model F to obtain the optimal opening degree combination of the first-stage electronic expansion valve of the first-stage economizer, the second-stage economizer, and the second-stage electronic expansion valve, which can be denoted as [Va1_i_opt, Va2_i_opt]; In summary, this step can make the heat pump system operate with the optimal opening degree of the first-stage electronic expansion valve and the optimal opening degree of the second-stage electronic expansion valve, reduce the energy consumption of the heat pump system, and improve the stability of the two-stage jet-increased enthalpy heat pump system.

[0052] Further, referring to Figure 3 , in some embodiments of the present application, the step of determining the control period of the heat pump system and the continuous control time corresponding to the control period according to the outdoor temperature time prediction sequence may include:

[0053] S110. Determine the temperature change rate of the first outdoor temperature at any moment within the target operation duration relative to the second outdoor temperature corresponding to the previous adjacent moment of the any moment according to the outdoor temperature time prediction sequence;

[0054] S120. Determine the target start time and the target end time of the target operation time from the outdoor temperature time prediction sequence, and determine each control period included in the outdoor temperature time prediction sequence and the continuous control time corresponding to each control period according to the temperature change rate;

[0055] In this embodiment, the first outdoor temperature may be the outdoor temperature at a time previous to the second outdoor temperature on the time axis starting from the moment when the heat pump starts to operate. The time difference between the first outdoor temperature and the second outdoor temperature is a preset time threshold. In this embodiment, according to the outdoor temperature time prediction sequence, the temperature change rate of the first outdoor temperature at any moment within the target operation duration relative to the second outdoor temperature corresponding to the previous adjacent moment at any moment can be determined. The target start moment and the target end moment of the target operation time can be determined from the outdoor temperature time prediction sequence, and any control period included in the outdoor temperature time prediction sequence and the corresponding continuous control time of any control period can be determined through the temperature change rate and the start moment and the end moment. In this embodiment, through the target start moment and the target end moment determined from the outdoor temperature time prediction sequence, and the temperature change rate at any corresponding moment, each control period and the continuous control time of the heat pump system can be quickly determined from the outdoor temperature time prediction sequence, improving the control speed of the heat pump system.

[0056] Further, referring to Figure 4 , in some embodiments of the present application, the step of determining, according to the outdoor temperature time prediction sequence, the temperature change rate of the outdoor temperature at any moment within the target operation duration relative to the previous adjacent moment corresponding to the any moment may include:

[0057] S111. Obtain, from the outdoor temperature time prediction sequence, the first outdoor temperature at any moment within the target operation duration and the second outdoor temperature corresponding to the previous adjacent moment at the any moment;

[0058] S112. Determine the temperature difference of the outdoor temperature according to the first outdoor temperature and the second outdoor temperature;

[0059] S113. Obtain the ratio of the absolute value of the temperature difference to the second outdoor temperature as the temperature change rate;

[0060] In some embodiments of the present application, the outdoor temperature at any moment within the target operation duration and the outdoor temperature corresponding to the previous adjacent moment at any corresponding moment can be first obtained from the outdoor temperature time prediction sequence. According to the outdoor temperature at any moment and the outdoor temperature at the previous adjacent moment at any moment, the temperature difference between two adjacent outdoor temperatures can be calculated. Finally, the absolute value of the temperature difference is taken, and the temperature change rate is determined according to the ratio of the absolute value and the outdoor temperature at the previous moment. Specifically, the formula can be referred to:

[0061]

[0062] In the above formula, DTRj is the temperature change rate at any moment j, Tout j is the first outdoor temperature, Tout j-1 is the second outdoor temperature corresponding to the previous moment. Specifically, in the outdoor temperature time forecast sequence, taking the startup time as 4 o'clock Beijing time as an example, the temperature corresponding to 5 o'clock is 4.5°C, the temperature corresponding to 6 o'clock is 5°C, the temperature corresponding to 7 o'clock is 6°C, and the temperature corresponding to 8 o'clock is 8°C. Correspondingly, the change rate at 6 o'clock is 1 / 9, the change rate at 7 o'clock is 1 / 6, and the change rate at 8 o'clock is 1 / 4. In summary, in this embodiment, the temperature change rate at any moment can be calculated through a preset formula, which can improve the processing speed of the temperature change rate data and the response speed of the two-stage jet-increasing enthalpy heat pump system.

[0063] Further, in some embodiments of the present application, the step of determining the target start time and the target end time corresponding to the outdoor temperature from the outdoor temperature time forecast sequence, and determining each control cycle included in the outdoor temperature time forecast sequence and the continuous control time corresponding to each control cycle according to the temperature change rate may include:

[0064] S121. For any target moment within the target operation time, obtain the target temperature change rate corresponding to the target moment, and adjust the number of control cycles and determine the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold;

[0065] In some embodiments of the present application, the target moment can be the temperature moment corresponding to any outdoor temperature within the target operation duration, and the target threshold can be any value; the magnitude relationship can be that the target threshold is greater than the temperature change rate, or the target threshold is less than the temperature change rate, or the target threshold is equal to the temperature change rate; according to the target temperature change rate corresponding to the target moment, the magnitude relationship between the target temperature change rate and the target threshold can be determined, and according to the magnitude relationship, the control period within the target operation duration can be adjusted and the continuous control time of each period can be determined; in some embodiments, it can be to determine that the target temperature change rate is greater than the target threshold and then calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period, or it can be to simultaneously determine that the target temperature change rate is greater than the target threshold and calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period; it can also be to determine that the target temperature change rate is equal to the target threshold and then calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period, or it can be to simultaneously determine that the target temperature change rate is equal to the target threshold and calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period; it can also be to determine that the target temperature change rate is less than the target threshold and then calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period, or it can be to simultaneously determine that the target temperature change rate is less than the target threshold and calculate the corresponding target temperature change rate, and finally obtain the control period of the heat pump system and determine the continuous control time of each period. The sequence of calculation of the two specific parameters is not limited here. In some other embodiments of the present application, within a period of operation time, there can be multiple target moments, and at this time, the corresponding target thresholds can also be multiple different thresholds or the same threshold. Specifically, for example, within a period of operation time, there are multiple target moments. The change rate at target moment A can be greater than the preset threshold b1, or the change rate at target moment B can be greater than the preset threshold b2, where b1 and b2 can be equal or not equal. Exemplarily, b1 can be 1 / 10, b2 can be 1 / 10 or 1 / 9, or other values, which are not specifically limited here. Correspondingly, the number of control periods is at least 1. Adjusting the number of control periods can specifically be to add a control period or keep the control period unchanged. When the control period remains unchanged, the continuous control time of the period can be increased by a preset time length, and the preset time length can be the same as the time difference corresponding to any two temperature values in the temperature time prediction sequence. This embodiment can improve the control accuracy of the heat pump system by setting thresholds and determining each control period and the continuous control time of each control period in combination with the thresholds and the temperature change rate.

[0066] Further, referring to Figure 5 , in some embodiments of the present application, the step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold may include:

[0067] S1211. When it is determined that the target temperature change rate is greater than or equal to the target threshold, increment the number of control cycles by one, determine the continuous control time of the control cycle as the difference between the current target moment and the previous target moment, and determine the current target moment as the new previous target moment;

[0068] S1212. When it is determined that the target temperature change rate is less than the target threshold, keep the number of control cycles unchanged, and determine the current target moment as the end moment of the previous control cycle;

[0069] In this embodiment, the magnitude relationship between the target temperature change rate and the target threshold can be divided into two cases: the target temperature change rate is greater than or equal to the target threshold, and the target temperature change rate is less than the target threshold. For any target moment, when the temperature change rate is greater than or equal to the target threshold, the number of control cycles can be increased by one, and the continuous control time of the control cycle is determined as the difference between the current target moment and the previous target moment; when the target temperature change rate is less than the target threshold, the number of control cycles remains unchanged, and the current target moment is determined as the end moment of the previous control cycle. Specifically, when the temperature change rate is greater than or equal to the target temperature change threshold, one control cycle is added; for example, if the original control cycle is 1, it is increased to 2. Specifically, the start time of the second control cycle is the end time of the first control cycle, and the end time of the second control cycle is the start time of the next cycle; when the target temperature change rate is less than the target temperature change threshold, for example, if the original control cycle is 1, the control cycle remains unchanged at 1, and then the current target moment is determined as the end moment of the first cycle. This embodiment can comprehensively determine the control cycle and the control duration in combination with the target temperature change rate and the target threshold, which can improve the stability of the dual-stage jet-injection heat pump system.

[0070] Further, in some embodiments of the present application, the step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold further includes:

[0071] S122. If it is determined that the temperature change rates at all target end times within the target operation duration are less than the target threshold, then within the target operation duration, adjust the control period to 1 and adjust the continuous control time of the control period to the target operation duration;

[0072] In an embodiment, when it is determined that the temperature change rates at all target end times within the target operation duration are less than the target threshold, that is, when the temperature change rates at the times corresponding to each temperature in the outdoor temperature time forecast sequence are less than the preset target threshold, then the number of control periods can be adjusted to 1 within the target operation duration, that is, the two-stage jet-injection heat pump system is controlled in one cycle, and the continuous control time of this cycle is equal to the target operation duration. It should be noted that the target threshold of the present application can be one or more, that is, the comparison threshold corresponding to the temperature change rate at the time corresponding to each temperature can be the same set threshold, or the set thresholds corresponding to each time can be different. This step can determine that the control period of the heat pump system of the method of the present application is at least 1, forming a closed loop of the control logic, and can improve the diversity of the control method of the two-stage jet-injection heat pump system, so that the control of the two-stage jet-injection heat pump system is more stable.

[0073] Further, referring to Figure 6 , in some embodiments of the present application, the determining the outdoor average temperature of the control period according to the outdoor temperature time forecast sequence and the continuous control time may include:

[0074] S310. Determine the start time and end time of the continuous control time;

[0075] S320. According to the start time and the end time, determine the outdoor temperature time forecast subsequence within the continuous control time;

[0076] S330. According to the outdoor temperature time forecast subsequence, determine the outdoor average temperature of the control period;

[0077] In this embodiment, the start time and end time of the continuous control time can be determined first. Based on the start time and end time, an outdoor temperature time prediction subsequence within the continuous control time is determined. The start time and end time of this outdoor temperature time prediction subsequence can coincide with the start time and end time of the continuous control time. According to the number of temperatures covered by the outdoor temperature time prediction subsequence and the specific temperature values, the average outdoor temperature of the control period can be determined. Specifically, if the start time of the continuous control time is determined to be 10 o'clock and the end time is 12 o'clock, with a half-hour interval, and the corresponding outdoor temperature time prediction subsequence is {25°C, 28°C, 32°C, 35°C, 38°C}, then the average outdoor temperature of the control period for this cycle is (25 + 28 + 32 + 35 + 38) / 5 = 33.6°C.

[0078] Further, in some embodiments of the present application, the step of determining the average outdoor temperature of the control period according to the outdoor temperature time prediction subsequence may include:

[0079] S331. Determine the sub-temperatures within the control period of the outdoor temperature time prediction subsequence and the quantities corresponding to the sub-temperatures;

[0080] S332. Determine the average outdoor temperature of the control period according to the sub-temperatures and the quantities corresponding to the sub-temperatures;

[0081] In the embodiment of the present application, the individual sub-temperatures within the control period of the outdoor temperature time prediction subsequence and the quantities corresponding to the individual sub-temperatures can be determined first. Then, by summing up the individual sub-temperatures within the control period, the sum of the sub-temperatures is obtained. By performing a division operation on the sum of the sub-temperatures and the quantity of the sub-temperatures, the average outdoor temperature of the control period can be obtained. Specifically, if the start time of the continuous control time is determined to be 10 o'clock and the end time is 13 o'clock, with a 1-hour interval, and the sub-temperatures in the corresponding outdoor temperature time prediction subsequence are -2°C, -4°C, 0°C, 2°C respectively, then the average outdoor temperature of the control period for this cycle is (-2 + -4 + 0 + 2) / 4 = -1°C. Through this embodiment, the average outdoor temperature of each control period can be quickly processed, which can improve the algorithm operation speed.

[0082] Further, in some embodiments of the present application, the step of obtaining the outdoor temperature time prediction sequence of the heat pump system within the target operation duration may specifically include:

[0083] Taking the start time of the heat pump system as the starting point of the outdoor temperature time prediction sequence, and taking the moment corresponding to the sum of the start time of the heat pump system and the target operation time as the end time, the outdoor temperature of the heat pump system and the measurement moment corresponding to the outdoor temperature are obtained at every preset time, and the outdoor temperature time prediction sequence is obtained.

[0084] In this embodiment, the start time of the heat pump system can be used as the starting point of the outdoor temperature time prediction sequence. The start time of the heat pump system can be the time when the heat pump is turned on, or it can also be a time node within a certain time range after the heat pump is turned on, such as the time node 3 minutes or 5 minutes after the heat pump is turned on. Taking the moment corresponding to the sum of the start time of the heat pump system and the target operation time as the end time, the outdoor temperature of the heat pump system and the measurement moment corresponding to the outdoor temperature can be obtained at every preset time interval, and finally the outdoor temperature time prediction sequence can be obtained. For example, if the start time is 0 o'clock and the operation time is 5 hours, and the time interval is 1 hour, then the starting point of the outdoor temperature time prediction sequence is 0 o'clock and the end point is 5 o'clock. The acquisition method can be through sensors, thermometer measurement, or through integrated devices of thermometers or control systems integrated with sensors, etc. This embodiment can quickly determine the time span of the outdoor temperature time prediction sequence and the number of temperatures in the sequence, and can improve the efficiency of the control algorithm.

[0085] Next, a complete control method for a two-stage jet enthalpy increase heat pump system in an embodiment of the present application will be described.

[0086] In one embodiment, the system start time is 9 o'clock, the temperature at startup is 9°C, the system target operation time is from 10 to 14 o'clock, the target operation duration is 4 hours, the interval of outdoor temperature prediction is 1 hour, and the predicted outdoor temperature value for each hour in the next 5 hours in the local area is [10°C, 11°C, 12°C, 13°C, 14°C]. The preset threshold at 10 o'clock is D1, the preset threshold at 11 o'clock is D2, the preset threshold at 12 o'clock is D3, the preset threshold at 13 o'clock is D4, and the preset threshold at 14 o'clock is D5, where D1, D2, D3, D4, and D5 are the same.

[0087] When the dual-stage jet enthalpy-increasing heat pump system is detected to start, the dual-stage jet enthalpy-increasing heat pump system is controlled to operate at a certain opening degree until 10 o'clock. After 10 o'clock, the following algorithm is used to obtain the optimal opening degree combination for each control cycle between the first-stage electronic expansion valve and the second-stage electronic expansion valve. With this optimal opening degree combination, the heat pump system is controlled to operate during the running time. For example, if the optimal opening degrees of the first-stage electronic expansion valve and the second-stage electronic expansion valve from 9 o'clock to 10 o'clock are a and b respectively, then during the control cycle from 9 o'clock to 10 o'clock, the jet enthalpy-increasing heat pump system operates with the opening degree a of the first-stage electronic expansion valve and the opening degree b of the second-stage electronic expansion valve. If the corresponding opening degrees calculated for 10 o'clock to 11 o'clock are c and d respectively, then during the control cycle from 10 o'clock to 11 o'clock, the jet enthalpy-increasing heat pump system operates with the opening degree c of the first-stage electronic expansion valve and the opening degree d of the second-stage electronic expansion valve.

[0088] Calculate the temperature change rate at 10 o'clock as (10 - 9) / 9 = 1 / 9; since 1 / 9 is greater than the set threshold D1, it is determined that the period from 9 o'clock to 10 o'clock is the first control cycle, with a cycle time of 1 hour, and the average temperature of the cycle is the average value of the front end and the end of the cycle, which is (9 + 10) / 2; when the change rate is less than the threshold D1, the whole system operates at a preset opening degree from 10 o'clock to 14 o'clock.

[0089] Calculate the temperature change rate at 11 o'clock. If the change rate at 11 o'clock is greater than the threshold D2, it is determined that the period from 10 o'clock to 11 o'clock is the second control cycle, with a cycle time of 1 hour and an average temperature of (10 + 11) / 2. If it is less, it is determined that the period from 9 o'clock to 11 o'clock is the first control cycle, and the average temperature is (9 + 10 + 11) / 3 = 10℃.

[0090] Calculate the temperature change rate at 12 o'clock; if the change rate at 11 o'clock is greater than the threshold D2 and the change rate at 12 o'clock is greater than the threshold D3, it is determined that the period from 11 o'clock to 12 o'clock is the third control cycle, with a cycle time of 1 hour and an average temperature of 11.5℃; if the change rate at 11 o'clock is greater than the threshold D2 and the change rate at 12 o'clock is less than the threshold D3, it is determined that the period from 10 o'clock to 12 o'clock is the second control cycle, with an average temperature of 11℃; if the change rate at 11 o'clock is less than the threshold D2 and the change rate at 12 o'clock is greater than the threshold D3, it is determined that the period from 11 o'clock to 12 o'clock is the second control cycle, with an average temperature of 11.5℃; if the change rate at 11 o'clock is less than the threshold and the change rate at 12 o'clock is less than the threshold D3, it is determined that the period from 10 o'clock to 12 o'clock is the first control cycle, with an average temperature of 11℃.

[0091] Calculate the temperature change rate at 13 o'clock; if the change rate at 11 o'clock is greater than the threshold D2, the change rate D3 at 12 o'clock is greater than the threshold, and the change rate at 13 o'clock is greater than the threshold D4, then determine that the period from 12 o'clock to 13 o'clock is the fourth control period, the period time is 1 hour, and the average temperature is 12.5 °C; if the change rate at 11 o'clock is greater than the threshold D2, the change rate at 12 o'clock is greater than the threshold D3, and the change rate at 13 o'clock is less than the threshold D4, then determine that the period from 11 o'clock to 13 o'clock is the third control period, the period time is 2 hours, and the average temperature is 12 °C; if the change rate at 11 o'clock is greater than the threshold D2, the change rate at 12 o'clock is less than the threshold D3, and the change rate at 13 o'clock is greater than the threshold D4, then determine that the period from 12 o'clock to 13 o'clock is the third control period, and the average temperature is 12.5 °C; if the change rate at 11 o'clock is greater than the threshold D2, the change rate at 12 o'clock is less than the threshold D3, and the change rate at 13 o'clock is less than the threshold D4, then determine that the period from 10 o'clock to 13 o'clock is the second control period, and the average temperature is 11.5 °C; if the change rate at 11 o'clock is less than the threshold D2, the change rate at 12 o'clock is greater than the threshold D3, and the change rate at 13 o'clock is greater than the threshold D4, then determine that the period from 12 o'clock to 13 o'clock is the third control period, and the average temperature is 12.5 °C; if the change rate at 11 o'clock is less than the threshold and the change rate at 12 o'clock is greater than the threshold D3, and the change rate at 13 o'clock is less than the threshold D4, determine that the period from 11 o'clock to 13 o'clock is the second control period, and the average temperature is 12 °C; if the change rate at 11 o'clock is less than the threshold D2, the change rate at 12 o'clock is less than the threshold D3, and the change rate at 13 o'clock is greater than the threshold D4, then determine that the period from 9 o'clock to 12 o'clock is the first control period, the period from 12 to 13 o'clock is the second control period, and the average temperature is 12.5 °C; if the change rate at 11 o'clock is less than the threshold D2, the change rate at 12 o'clock is less than the threshold D3, and the change rate at 13 o'clock is less than the threshold D4, then determine that the period from 10 to 13 o'clock is the first control period, and the average temperature is 11.5 °C.

[0092] And so on, calculate the temperature change rate at 14 o'clock, determine the time of each control period and the average temperature; input the average temperature and the corresponding control period into the heat pump system performance model preset in the system internal memory, and the opening degree of the first-stage electronic expansion valve and the opening degree of the second-stage electronic expansion valve can be determined. This opening degree is the optimal opening degree for each period. It should be added that the heat pump system performance model of this application can be an existing model, such as a model formed by artificial intelligence technology or other data processing models. This model can be stored in a specific device, can be included in a certain device, can also be stored in the memory, and can also be included in the storage medium; correspondingly, relevant personnel can input the average temperature and the corresponding control period through the host computer or a handheld device or a remote system.

[0093] It should be noted that since the processing time of the above algorithm is very short, in some embodiments, the two-stage jet enthalpy-increasing heat pump system can also operate at the opening degree of the first-stage electronic expansion valve and the opening degree of the second-stage electronic expansion valve determined according to the above algorithm at 9-10 o'clock.

[0094] In another embodiment, the system startup time is 8:30, the startup temperature is 3°C, the system target operation time is from 9 to 11 o'clock, the target operation duration is 2 hours, the interval of outdoor temperature forecast is 30 minutes, and the hourly outdoor temperature forecast values for the next 3 hours in the local area are [4°C, 5°C, 6°C, 7°C, 8°C]. The preset threshold at 9 o'clock is D6, the preset threshold at 9:30 is D7, the preset threshold at 10 o'clock is D8, the preset threshold at 10:30 is D9, and the preset threshold at 11 o'clock is D10, where D6, D7, D8, D9, and D10 are all different;

[0095] When it is detected that the two-stage jet enthalpy-increasing heat pump system starts, it is controlled to operate until 9 o'clock with a certain opening degree. In some feasible cases, the opening degree from 9 to 10 can also be obtained by the following algorithm. After 9 o'clock, the optimal opening degree combination of each control cycle between the first-stage electronic expansion valve and the second-stage electronic expansion valve is obtained by the following algorithm, and the heat pump system is controlled to operate during the operation time with this optimal opening degree combination. For example, if the optimal opening degrees of the first-stage electronic expansion valve and the second-stage electronic expansion valve from 9 o'clock to 9:30 are e and f, then the jet enthalpy-increasing heat pump system operates at the opening degree e of the first-stage electronic expansion valve and the opening degree f of the second-stage electronic expansion valve during the control cycle from 9 o'clock to 9:30. If the corresponding opening degrees from 9:30 to 10 o'clock are g and h, then the jet enthalpy-increasing heat pump system operates at the opening degree of the first-stage electronic expansion valve and the opening degree h of the second-stage electronic expansion valve during the control cycle from 9:30 to 10 o'clock.

[0096] Calculate the temperature change rate at 9 o'clock as (4 - 3) / 3 = 1 / 3; 1 / 3 is greater than the set threshold D6, then it is determined that the period from 8:30 to 9 o'clock is the first control cycle, the cycle time is 1 hour, and the average temperature of the cycle is the average of the front end and the end of the cycle, which is (3 + 4) / 2 = 3.5°C; when the change rate is less than the threshold D6, the whole system operates at the preset opening degree from 9 to 11 o'clock.

[0097] Calculate the temperature change rate at 9:30. If the temperature change rate at 9:30 is greater than the threshold D7, then it is determined that the period from 9 o'clock to 9:30 is the second control cycle, the cycle time is 30 minutes, and the average temperature is (4 + 5) / 2 = 4.5°C. If the temperature change rate is less than the threshold D7, then it is determined that the period from 8:30 to 9:30 is the first control cycle, and the average temperature is (4 + 5 + 6) / 3 = 5°C.

[0098] Calculate the temperature change rate at 10 o'clock; if the change rate at 9:30 is greater than the threshold D7 and the change rate at 10 o'clock is greater than the threshold D8, then determine that the period from 9:30 to 10 o'clock is the third control period, the period time is 30 minutes, and the average temperature is 4.5 °C; if the change rate at 9:30 is greater than the threshold D7 and the change rate at 10 o'clock is less than the threshold D8, then determine that the period from 9 o'clock to 10 o'clock is the second control period, and the average temperature is 5 °C; if the change rate at 9:30 is less than the threshold D7 and the change rate at 10 o'clock is greater than the threshold D8, then determine that the period from 9:30 to 10 o'clock is the second control period, and the average temperature is 5.5 °C; if the change rate at 9:30 is less than the threshold and the change rate at 10 o'clock is less than the threshold D9, then determine that the period from 9 to 10 o'clock is the first control period, and the average temperature is 5 °C.

[0099] Calculate the temperature change rate at 10:30; if the change rate at 9:30 is greater than the threshold D2 and the change rate at 10 o'clock D8 is greater than the threshold and the change rate at 10:30 is greater than the threshold D9, then determine that the period from 10 o'clock to 10:30 is the fourth control period, the period time is 30 minutes, and the average temperature is 6.5 °C; if the change rate at 9:30 is greater than the threshold D2 and the change rate at 10 o'clock is greater than the threshold D8 and the change rate at 10:30 is less than the threshold D9, then determine that the period from 9:30 to 10:30 is the third control period, the period time is 1 hour, and the average temperature is 6 °C; if the change rate at 9:30 is greater than the threshold D2 and the change rate at 10 o'clock is less than the threshold D8 and the change rate at 10:30 is greater than the threshold D9, then determine that the period from 10 o'clock to 10:30 is the third control period, and the average temperature is 6.5 °C; if the change rate at 9:30 is greater than the threshold D2 and the change rate at 10 o'clock is less than the threshold D8 and the change rate at 10:30 is less than the threshold D9, then determine that the period from 9:30 to 10:30 is the second control period, and the average temperature is 6 °C; if the change rate at 9:30 is less than the threshold D2 and the change rate at 10 o'clock is greater than the threshold D8 and the change rate at 10:30 is greater than the threshold D9, then determine that the period from 10 o'clock to 10:30 is the third control period, and the average temperature is 6.5 °C; if the change rate at 9:30 is less than the threshold and the change rate at 10 o'clock is greater than the threshold D8 and the change rate at 10:30 is less than the threshold D9, determine that the period from 9:30 to 10:30 is the second control period, and the average temperature is 6 °C; if the change rate at 9:30 is less than the threshold D2 and the change rate at 10 o'clock is less than the threshold D8 and the change rate at 10:30 is greater than the threshold D9, then determine that the period from 9 o'clock to 10 o'clock is the first control period, the period from 10 o'clock to 10:30 is the second control period, and the average temperature is 6.5 °C; if the change rate at 9:30 is less than the threshold D2 and the change rate at 10 o'clock is less than the threshold D8 and the change rate at 10:30 is less than the threshold D9, then determine that the period from 9 o'clock to 10:30 is the first control period, and the average temperature is 5.5 °C.

[0100] And so on, calculate the change rate of subsequent temperatures, determine the time of each control cycle and the average temperature; according to the average temperature and the corresponding control cycle, input them into the preset model to determine the opening degrees of the first-stage electronic expansion valve and the second-stage electronic expansion valve respectively.

[0101] In addition, in some embodiments of the present application, a control device for a two-stage jet-enhanced enthalpy heat pump system is further provided. Figure 7 It is a schematic structural diagram of a control device for a two-stage jet-enhanced enthalpy heat pump system according to an embodiment of the present invention.

[0102] The control device for the two-stage jet-enhanced enthalpy heat pump system may include: an acquisition module 710, a first determination module 720, a second determination module 730, and an adjustment module 740.

[0103] Among them, the acquisition module 710 may be used to acquire the outdoor temperature time prediction sequence of the heat pump system within the target operation duration; the outdoor temperature time prediction sequence is a sequence formed by arranging the numerical values of the outdoor temperature in the order of measurement time within a set future time period; the first determination module 720 may be used to determine the control cycle of the heat pump system and the corresponding continuous control time of the control cycle according to the outdoor temperature time prediction sequence; the second determination module 730 may be used to determine the average outdoor temperature within the control cycle according to the outdoor temperature time prediction sequence and the continuous control time; the adjustment module 740 may determine the first target opening degree of the first-stage electronic expansion valve and the second target opening degree of the second-stage electronic expansion valve corresponding to the control cycle according to the average outdoor temperature and the continuous control time, and control the two-stage jet-enhanced enthalpy heat pump system with the first target opening degree and the second target opening degree.

[0104] In some other embodiments of the present application, when the acquisition module 710, the first determination module 720, the second determination module 730, and the adjustment module 740 are set as multiple interconnected different devices, the acquisition module 710 may be connected to the first determination module 720 through an electrical wire, the first determination module 720 may be connected to the second determination module 730 through a communication wire, and the second determination module 730 is connected to the adjustment module 740 through an electrical wire. In some embodiments, the acquisition module 710 may be a module communicatively connected to a host computer, and while acquiring the running time of the system, it may acquire the corresponding outdoor temperature time prediction sequence on the host computer through communication, or acquire the corresponding outdoor temperature time prediction sequence through networking with a mobile phone terminal, etc.; as can be seen from the above device, the content in the above method embodiments is applicable to the device embodiments of the present application, and the functions specifically implemented by the device embodiments of the present application are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0105] The embodiments of the present application also provide another control device for a two-stage jet-injected heat pump system. Refer to Figure 8 , the device may at least include: a processor 810 and a memory 820. The processor memory 820 may be used to store a computer program or multiple computer programs. When at least one program is executed by at least one processor, it may enable at least one processor to implement the control method of the two-stage jet-injected heat pump system in any of the previous embodiments. It should be noted that the content in the above method embodiments is applicable to the device embodiments of the present application. The functions specifically implemented by the device embodiments of the present application are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0106] The embodiments of the present application also provide an air conditioner, which may include the control device of the two-stage jet-injected heat pump system in any of the above embodiments.

[0107] The content in the above control device embodiments is applicable to the air conditioner device embodiments of the present application. The functions specifically implemented by the air conditioner device embodiments of the present application are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0108] The embodiments of the present application also provide a computer-readable storage medium, where the storage medium may store a program executable by the processor 810. The program executable by the processor 810 is used to execute the above control method of the two-stage jet-injected heat pump system when executed by the processor 810.

[0109] Similarly, the content in the above method embodiments is applicable to the storage medium embodiments of the present application. The functions specifically implemented by the storage medium embodiments of the present application are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those in the above method embodiments.

[0110] In summary, the control method, device, air conditioner, and medium of the two-stage jet-injected heat pump system provided by the embodiments of the present application can combine the running time and the outdoor temperature sequence corresponding to the running time, comprehensively consider the influence of different temperatures of the heat pump system during the running time, control the heat pump system, so that the heat pump system always runs at the target opening degree during the running time, which can improve the energy efficiency of the two-stage jet-injected heat pump system and at the same time improve the stability of the heat pump system.

[0111] In some alternative embodiments, the functions / operations recited in the block diagrams may not occur in the order presented in the operational illustrations. For example, depending on the functions / operations involved, two blocks shown in succession may actually be executed substantially simultaneously or the blocks can sometimes be executed in the reverse order. Further, the embodiments presented and described in the flowcharts of the present invention are provided by way of example for purposes of providing a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is altered and in which sub-operations described as part of a larger operation are performed independently.

[0112] Moreover, while the present invention has been described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated in a single physical device and / or software module or one or more of the functions and / or features may be implemented in separate physical devices or software modules. It should also be understood that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present invention. Rather, the actual implementation of the module would be understood within the ordinary skill of an engineer, given the attributes, functions, and internal relationships of the various functional modules in the apparatus disclosed herein. Accordingly, those skilled in the art can implement the invention as set forth in the claims without undue experimentation. It should also be understood that the particular concepts disclosed are illustrative only and not intended to limit the scope of the invention, the scope of which is determined by the full scope of the appended claims and their equivalents.

[0113] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such 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 stored in a storage medium, which includes several programs 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 aforementioned storage medium includes various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0114] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definitional sequence list of executable instructions for implementing logical functions, and can be embodied specifically in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with the instruction execution system, apparatus, or device.

[0115] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which a program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0116] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

[0117] In the above description of this specification, the descriptions referring to the terms "one embodiment / example", "another embodiment / example", or "certain embodiments / 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 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 any one or more embodiments or examples in a suitable manner.

[0118] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0119] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A control method for a two-stage jet enthalpy-increasing heat pump system, characterized in that The heat pump system includes an indoor heat exchanger, an outdoor heat exchanger, a first-stage economizer, a first-stage electronic expansion valve of the first-stage economizer, a second-stage economizer, a second-stage electronic expansion valve of the second-stage economizer, a main electronic expansion valve, and a compressor; the first-stage electronic expansion valve is connected to the gas supplement port of the compressor, and the second-stage electronic expansion valve is connected to the suction port of the compressor; the control method for the two-stage jet enhanced enthalpy heat pump system includes the following steps: Obtain the outdoor temperature time prediction sequence of the heat pump system within the target operation duration; the outdoor temperature time prediction sequence is a sequence formed by arranging the numerical values of the outdoor temperature in the order of measurement time within a future set time period; According to the outdoor temperature time prediction sequence, determine the control period of the heat pump system and the corresponding continuous control time of the control period; According to the outdoor temperature time prediction sequence and the continuous control time, determine the average outdoor temperature within the control period; According to the average outdoor temperature and the continuous control time, determine the first target opening degree of the first-stage electronic expansion valve and the second target opening degree of the second-stage electronic expansion valve corresponding to the control period, and control the two-stage jet enhanced enthalpy heat pump system with the first target opening degree and the second target opening degree.

2. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 1, wherein The step of determining the control period of the heat pump system and the corresponding continuous control time of the control period according to the outdoor temperature time prediction sequence includes: According to the outdoor temperature time prediction sequence, determine the temperature change rate of the first outdoor temperature at any moment within the target operation duration relative to the second outdoor temperature corresponding to the previous adjacent moment of the any moment; Determine the target start time and the target end time of the target operation time from the outdoor temperature time prediction sequence, and according to the temperature change rate, determine each control period included in the outdoor temperature time prediction sequence and the corresponding continuous control time of each control period.

3. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 2, wherein The step of determining the temperature change rate of the outdoor temperature at any moment within the target operation duration relative to the previous adjacent moment corresponding to the any moment according to the outdoor temperature time prediction sequence includes: Obtain the first outdoor temperature at any moment within the target operation duration and the second outdoor temperature corresponding to the previous adjacent moment of the any moment from the outdoor temperature time prediction sequence; According to the first outdoor temperature and the second outdoor temperature, determine the temperature difference of the outdoor temperature; Obtain the ratio of the absolute value of the temperature difference to the second outdoor temperature as the temperature change rate.

4. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 2, characterized in that, The step of determining the target start time and the target end time corresponding to the outdoor temperature from the outdoor temperature time prediction sequence, and according to the temperature change rate, determining each control period included in the outdoor temperature time prediction sequence and the corresponding continuous control time of each control period includes: For any target moment within the target running time, obtain the target temperature change rate corresponding to the target moment, and adjust the number of control cycles and determine the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold.

5. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 4, wherein, The step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold includes: When it is determined that the target temperature change rate is greater than or equal to the target threshold, increment the number of control cycles by one, determine the continuous control time of the control cycle as the difference between the current target moment and the previous target moment, and determine the current target moment as the new previous target moment; When it is determined that the target temperature change rate is less than the target threshold, keep the number of control cycles unchanged, and determine the current target moment as the end moment of the previous control cycle.

6. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 4, wherein, The step of, for any target moment, obtaining the target temperature change rate corresponding to the target moment, and adjusting the number of control cycles and determining the continuous control time of the control cycle according to the magnitude relationship between the target temperature change rate and the target threshold further includes: If it is determined that the temperature change rates of all target end moments within the target running duration are less than the target threshold, then adjust the control cycle to 1 within the target running duration, and adjust the continuous control time of the control cycle to the target running duration.

7. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 1, characterized in that, The step of determining the outdoor average temperature of the control cycle according to the outdoor temperature time forecast sequence and the continuous control time includes: Determine the start moment and the end moment of the continuous control time; According to the start moment and the end moment, determine the outdoor temperature time forecast subsequence within the continuous control time; According to the outdoor temperature time forecast subsequence, determine the outdoor average temperature of the control cycle.

8. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 7, characterized in that, The step of determining the outdoor average temperature of the control cycle according to the outdoor temperature time forecast subsequence includes: Determine the sub-temperatures within the control cycle of the outdoor temperature time forecast subsequence and the quantities corresponding to the sub-temperatures; According to the sub-temperatures and the quantities corresponding to the sub-temperatures, determine the outdoor average temperature of the control cycle.

9. The control method of the two-stage jet enthalpy-increasing heat pump system according to claim 1, characterized in that The step of obtaining the outdoor temperature time forecast sequence of the heat pump system within the target running duration specifically includes: Taking the start time of the heat pump system as the starting point of the outdoor temperature time forecast sequence, and taking the moment corresponding to the sum of the start time of the heat pump system and the target running time as the end time, obtain the outdoor temperature of the heat pump system and the measurement moment corresponding to the outdoor temperature at every preset time interval, to obtain the outdoor temperature time forecast sequence.

10. A control device for a two-stage jet enthalpy-increasing heat pump system, characterized in that, The dual-stage jet enthalpy-increasing heat pump system control device is used to implement the dual-stage jet enthalpy-increasing heat pump system control method according to any one of claims 1-9. The dual-stage jet enthalpy-increasing heat pump system control device includes: An acquisition module, configured to acquire an outdoor temperature time prediction sequence of a heat pump system within a target operation duration; the outdoor temperature time prediction sequence is a sequence in which the numerical values of the outdoor temperature are arranged in the order of measurement time within a set future time period; A first determination module, configured to determine a control period of the heat pump system and a corresponding continuous control time of the control period according to the outdoor temperature time prediction sequence; A second determination module, configured to determine an average outdoor temperature within the control period according to the outdoor temperature time prediction sequence and the continuous control time; A control module, configured to determine a first target opening degree of the first-stage electronic expansion valve and a second target opening degree of the second-stage electronic expansion valve corresponding to the control period according to the average outdoor temperature and the continuous control time, and control the two-stage jet enthalpy-increasing heat pump system with the first target opening degree and the second target opening degree.

11. A control device for a two-stage jet-increased enthalpy heat pump system, characterized in that, Comprising: At least one processor; At least one memory, configured to store at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1-9.

12. An air conditioner, characterized in that, The air conditioner includes the two-stage jet enthalpy-increasing heat pump system control device according to claim 10 or 11.

13. A computer-readable storage medium storing a program executable by a processor, characterized in that, The program executable by the processor implements the method according to any one of claims 1-9 when executed by the processor.

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