Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention provides an air conditioner and a control method and device thereof, a storage medium and a computer program product, and the method comprises the following steps: after the air conditioner is started for refrigeration and operation, determining to enter an air supply mode or a temperature and humidity control mode according to indoor temperature and indoor relative humidity; if it is determined that the air conditioner enters the temperature and humidity control mode, the current building load and the corresponding sensible heat ratio of the air conditioner are obtained according to indoor and outdoor environment parameters and set parameters of the air conditioner; according to the obtained current building load of the air conditioner and the corresponding sensible heat ratio, the compressor frequency, the inner fan rotating speed and the outer fan rotating speed of the air conditioner are calculated; according to the calculated compressor frequency of the air conditioner and the operation state parameters of the air conditioner, the opening degree of a throttling device of the air conditioner is calculated; and controlling the air conditioner to operate according to the compressor frequency, the rotating speed of the inner fan, the rotating speed of the outer fan and the opening degree of the throttling device which are obtained through calculation. According to the scheme, the humidity can be accurately controlled in the cooling process of the air conditioner, and the indoor comfort is improved.

Description

Technical Field

[0001] The present invention relates to the field of control, and in particular to an air conditioner and a control method, device, storage medium and computer program product thereof. Background Art

[0002] Household variable-frequency air conditioners have become popular in my country, but for most variable-frequency air conditioner systems, their control logic and control methods need to be further improved.

[0003] Most air conditioners in the related art can only control the indoor temperature, and dehumidification is only a byproduct of the cooling process. They cannot accurately reduce the indoor humidity to the range required by the user, but humidity is also an important factor affecting the comfort of the indoor environment. In addition, the evaporation temperature of most high-efficiency air conditioners in the related art is relatively high, and some do not dehumidify when running at the rated point, which makes the relative humidity in the room high, affecting the comfort. At this time, in order to dehumidify, the user needs to turn on the dehumidification mode. The evaporation temperature of the dehumidification mode is relatively low, which cannot meet the air outlet temperature set by the user. It is not comfortable and not energy-saving. On the other hand, the control logic of the air conditioner in the related art does not take into account the building load, and cannot match the system parameters in real time according to the building load, resulting in the operation process not being energy-saving. Therefore, how to accurately control the humidity during the temperature control process and make the air conditioner run near the optimal state point is an issue that we urgently need to solve. Summary of the invention

[0004] The main purpose of the present invention is to overcome the defects of the above-mentioned related technologies and to provide an air conditioner and its control method, device, storage medium and computer program product to solve the problem in the related technologies that the system parameters cannot be matched in real time according to the building load, resulting in the operation process not being energy-saving.

[0005] On the one hand, the present invention provides a method for controlling an air conditioner, comprising: after the air conditioner is started for refrigeration operation, determining whether to enter an air supply mode or a temperature and humidity control mode according to the indoor temperature and the indoor relative humidity; if it is determined to enter the temperature and humidity control mode, obtaining the current building load of the air conditioner and the corresponding sensible heat ratio according to indoor and outdoor environmental parameters and the setting parameters of the air conditioner; calculating the compressor frequency, the internal fan speed and the external fan speed of the air conditioner according to the obtained current building load and the corresponding sensible heat ratio of the air conditioner; calculating the throttling device opening of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating status parameters of the air conditioner; and controlling the air conditioner to operate according to the calculated compressor frequency, the internal fan speed, the external fan speed and the throttling device opening.

[0006] Optionally, entering the air supply mode or the temperature and humidity control mode is determined according to the indoor temperature and the indoor relative humidity, including: calculating the indoor air humidity content according to the current indoor temperature and the indoor relative humidity combined with the atmospheric pressure, and calculating and setting the indoor air target humidity content according to the set temperature and the set relative humidity combined with the atmospheric pressure; judging whether the difference between the current indoor temperature and the set temperature is less than or equal to the preset temperature difference, and whether the difference between the indoor air humidity content and the set indoor air target humidity content is less than or equal to the preset humidity difference; if it is judged that the difference between the indoor temperature and the set temperature is less than or equal to the preset temperature difference, and the difference between the indoor air humidity content and the set indoor air target humidity content is less than or equal to the preset humidity difference, then it is determined to enter the air supply mode; if it is judged that the difference between the indoor temperature and the set temperature is greater than the preset temperature difference, or the difference between the indoor air humidity content and the set indoor air target humidity content is greater than the preset humidity difference, then it is determined to enter the temperature and humidity control mode.

[0007] Optionally, based on indoor and outdoor environmental parameters and the setting parameters of the air conditioner, the current building load of the air conditioner and the corresponding sensible heat ratio are obtained, including: obtaining a pre-established correspondence between different indoor and outdoor environmental parameters and the building load Q and sensible heat ratio SHR of the air conditioner; based on the current indoor and outdoor environmental parameters and the correspondence, obtaining the current building load Q and sensible heat ratio SHR of the air conditioner.

[0008] Optionally, the throttling device opening of the air conditioner is calculated according to the calculated compressor frequency of the air conditioner and the operating state parameters of the air conditioner, including: calculating the suction saturation temperature according to the compressor frequency, the temperature in the evaporator tube and the saturated pressure drop from the middle of the evaporator to the compressor suction port; calculating the suction dryness according to the compressor frequency, the suction saturation temperature, the exhaust temperature and the temperature in the condenser tube; calculating the superheated suction specific volume or the two-phase suction specific volume according to the size of the suction dryness; calculating the compressor volumetric efficiency according to the compressor frequency, the temperature in the condenser tube and the temperature in the evaporator tube; calculating the compressor volumetric efficiency according to the superheated suction specific volume or the two-phase suction specific volume The relative suction volume is combined with the compressor cylinder volume, compressor frequency and compressor volumetric efficiency to calculate the circulating refrigerant flow in the system; the refrigerant density at the throttling device inlet is calculated according to the condenser outlet temperature; the inlet and outlet pressure difference of the throttling device is calculated according to the condenser tube temperature, the evaporator tube temperature, the saturated temperature drop from the middle of the condenser to the condenser outlet, and the saturated temperature drop from the throttling device to the middle of the evaporator; the air flow corresponding to the throttling device is calculated according to the inlet and outlet pressure difference of the throttling device, the circulating refrigerant flow in the system and the refrigerant at the inlet of the throttling device; the throttling device opening is calculated according to the calculated air flow corresponding to the throttling device.

[0009] Optionally, controlling the air conditioner to operate according to the calculated compressor frequency includes: controlling the compressor of the air conditioner to operate according to the calculated compressor frequency and / or according to the set oil return frequency based on the calculated compressor frequency and the set oil return frequency; wherein, when the calculated compressor frequency is greater than the set oil return frequency, controlling the compressor to operate at the calculated compressor frequency, and when the calculated compressor frequency is less than the set oil return frequency, controlling the compressor to start at the set oil return frequency and run for a second preset time, and then running at the calculated compressor frequency.

[0010] Optionally, it also includes: after controlling the air conditioner to run for a first preset time according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening, PID control is performed on the compressor frequency, internal fan speed and throttling device opening of the air conditioner, including: PID control of the compressor frequency f of the air conditioner according to the indoor temperature and the set temperature of the air conditioner; and / or, PID control of the internal fan speed of the air conditioner according to the indoor relative humidity and the set relative humidity of the air conditioner; and / or, PID control of the air conditioner and the throttling device opening according to the exhaust temperature and the target exhaust temperature.

[0011] Optionally, PID control is performed on the compressor frequency of the air conditioner according to the indoor temperature and the set temperature of the air conditioner, including: adjusting the compressor frequency according to the difference between the real-time detected indoor temperature and the set temperature and the corresponding rate of change of the difference between the indoor temperature and the set temperature; PID control is performed on the internal fan speed of the air conditioner according to the indoor relative humidity and the set relative humidity of the air conditioner, including: adjusting the internal fan speed according to the difference between the real-time detected relative humidity and the set relative humidity and the corresponding rate of change of the difference between the indoor relative humidity and the set relative humidity; PID control is performed on the throttling device opening nv of the air conditioner according to the exhaust temperature and the target exhaust temperature, including: adjusting the throttling device opening according to the difference between the real-time detected exhaust temperature and the target exhaust temperature and the rate of change of the difference between the exhaust temperature and the target exhaust temperature.

[0012] Optionally, it also includes: after PID control of the compressor frequency, internal fan speed and throttling device opening of the air conditioner, judging whether the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter; if it is judged that the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter, maintaining the current operating parameters; otherwise, continuing PID control.

[0013] On the other hand, the present invention provides a control device for an air conditioner, comprising: a determination unit, for determining whether to enter an air supply mode or a temperature and humidity control mode according to the indoor temperature and the indoor relative humidity after the air conditioner is started for refrigeration; an acquisition unit, for acquiring the current building load of the air conditioner and the corresponding sensible heat ratio according to the indoor and outdoor environmental parameters and the setting parameters of the air conditioner if the determination unit determines to enter the temperature and humidity control mode; a first calculation unit, for calculating the compressor frequency, the internal fan speed and the external fan speed of the air conditioner according to the current building load and the corresponding sensible heat ratio of the air conditioner acquired by the acquisition unit; a second calculation unit, for calculating the throttling device opening of the air conditioner according to the compressor frequency of the air conditioner calculated by the first calculation unit and the operating status parameters of the air conditioner; a control unit, for controlling the air conditioner to operate according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening.

[0014] Optionally, the determination unit determines whether to enter the air supply mode or the temperature and humidity control mode according to the indoor temperature and the indoor relative humidity, including: calculating the indoor air humidity content according to the current indoor temperature and the indoor relative humidity combined with the atmospheric pressure, and calculating and setting the indoor air target humidity content according to the set temperature and the set relative humidity combined with the atmospheric pressure; judging whether the difference between the current indoor temperature and the set temperature is less than or equal to the preset temperature difference, and whether the difference between the indoor air humidity content and the set indoor air target humidity content is less than or equal to the preset humidity difference; if it is judged that the difference between the indoor temperature and the set temperature is less than or equal to the preset temperature difference, and the difference between the indoor air humidity content and the set indoor air target humidity content is less than or equal to the preset humidity difference, then it is determined to enter the air supply mode; if it is judged that the difference between the indoor temperature and the set temperature is greater than the preset temperature difference, or the difference between the indoor air humidity content and the set indoor air target humidity content is greater than the preset humidity difference, then it is determined to enter the temperature and humidity control mode.

[0015] Optionally, the acquisition unit acquires the current building load Q and the corresponding sensible heat ratio of the air conditioner according to the indoor and outdoor environmental parameters and the setting parameters of the air conditioner, including: acquiring a pre-established correspondence between different indoor and outdoor environmental parameters and the building load Q and the sensible heat ratio SHR of the air conditioner; acquiring the current building load Q and the sensible heat ratio SHR of the air conditioner according to the current indoor and outdoor environmental parameters and the correspondence.

[0016] Optionally, the second calculation unit calculates the throttling device opening of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameters of the air conditioner, including: calculating the suction saturation temperature according to the compressor frequency, the temperature in the evaporator tube and the saturated pressure drop from the middle of the evaporator to the compressor suction port; calculating the suction dryness according to the compressor frequency, the suction saturation temperature, the exhaust temperature and the temperature in the condenser tube; calculating the superheated suction specific volume or the two-phase suction specific volume according to the size of the suction dryness; calculating the compressor volumetric efficiency according to the compressor frequency, the temperature in the condenser tube and the temperature in the evaporator tube; calculating the suction saturation temperature according to the compressor frequency, the temperature in the condenser tube and the temperature in the evaporator tube; calculating the suction saturation temperature according to the compressor frequency, the suction saturation temperature, the exhaust temperature and the temperature in the condenser ... Specific volume or two-phase suction specific volume, combined with compressor cylinder volume, compressor frequency and compressor volumetric efficiency, calculate the circulating refrigerant flow in the system; calculate the refrigerant density at the inlet of the throttling device according to the condenser outlet temperature; calculate the inlet and outlet pressure difference of the throttling device according to the temperature in the condenser tube, the temperature in the evaporator tube, the saturated temperature drop from the middle of the condenser to the condenser outlet, and the saturated temperature drop from the throttling device to the middle of the evaporator; calculate the air flow corresponding to the throttling device according to the inlet and outlet pressure difference of the throttling device, the circulating refrigerant flow in the system and the refrigerant at the inlet of the throttling device; calculate the opening of the throttling device according to the calculated air flow corresponding to the throttling device.

[0017] Optionally, the control unit controls the air conditioner to operate according to the calculated compressor frequency, including: according to the calculated compressor frequency and the set oil return frequency, controlling the compressor of the air conditioner to operate according to the calculated compressor frequency and / or according to the set oil return frequency; wherein, when the calculated compressor frequency is greater than the set oil return frequency, the compressor is controlled to operate at the calculated compressor frequency, and when the calculated compressor frequency is less than the set oil return frequency, the compressor is controlled to start at the set oil return frequency and run for a second preset time, and then run at the calculated compressor frequency.

[0018] Optionally, it also includes: a PID control unit, which is used to perform PID control on the compressor frequency, internal fan speed and throttling device opening of the air conditioner after controlling the air conditioner to run for a first preset time according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening, including: PID control of the compressor frequency f of the air conditioner according to the indoor temperature and the set temperature of the air conditioner; and / or, PID control of the internal fan speed of the air conditioner according to the indoor relative humidity and the set relative humidity of the air conditioner; and / or, PID control of the throttling device opening nv of the air conditioner according to the exhaust temperature and the target exhaust temperature.

[0019] Optionally, the PID control unit performs PID control on the compressor frequency f of the air conditioner according to the indoor temperature and the set temperature of the air conditioner, including: adjusting the compressor frequency according to the difference between the real-time detected indoor temperature and the set temperature and the corresponding rate of change of the difference between the indoor temperature and the set temperature; performs PID control on the internal fan speed of the air conditioner according to the indoor relative humidity and the set relative humidity of the air conditioner, including: adjusting the internal fan speed according to the difference between the real-time detected relative humidity and the set relative humidity and the corresponding rate of change of the difference between the indoor relative humidity and the set relative humidity; performs PID control on the throttling device opening nv of the air conditioner according to the exhaust temperature and the target exhaust temperature, including: adjusting the throttling device opening according to the difference between the real-time detected exhaust temperature and the target exhaust temperature and the rate of change of the difference between the exhaust temperature and the target exhaust temperature.

[0020] Optionally, it also includes: a judgment unit, which is used to judge whether the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter after PID control is performed on the compressor frequency, the internal fan speed and the throttling device opening of the air conditioner; the PID control unit is also used to: if the judgment unit judges that the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter, maintain the current operating parameter; otherwise, continue PID control.

[0021] Optionally, it also includes: a collection unit, which is used to collect the operating parameters and indoor and outdoor environmental parameters of the air conditioner when the air conditioner enters a stable state after PID control is performed on the compressor frequency, internal fan speed and throttling device opening of the air conditioner; a third calculation unit, which is used to calculate the building load Q and the corresponding sensible heat ratio of the air conditioner based on the operating parameters and indoor and outdoor environmental parameters of the air conditioner collected by the collection unit.

[0022] Another aspect of the present invention provides a storage medium having a computer program stored thereon, wherein the program implements the steps of any of the aforementioned methods when executed by a processor.

[0023] In another aspect, the present invention provides an air conditioner, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the aforementioned methods when executing the program.

[0024] In another aspect, the present invention provides an air conditioner, comprising any of the control devices described above.

[0025] In yet another aspect, the present invention provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of any of the aforementioned methods are implemented.

[0026] According to the technical solution of the present invention, the speed of the air-conditioning internal fan, the speed of the external fan and the compressor frequency are determined according to the building load and the sensible heat ratio, and the opening of the electronic expansion valve is determined according to the operating status of the air-conditioning, so as to realize precise control of humidity during the cooling process of the air-conditioning, improve indoor comfort and save energy at the same time.

[0027] According to the technical solution of the present invention, the compressor frequency, the speed of the internal and external fans, and the opening of the electronic expansion valve are directly calculated through the detected parameters, so the system adjustment cycle is shortened and the operation control is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 is a method schematic diagram of an embodiment of the air conditioner control method provided by the present invention;

[0030] Figure 2 A flowchart showing a specific implementation of the step of calculating the opening degree of the throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameter of the air conditioner;

[0031] Figure 3 A flow chart showing a specific implementation of the throttling device opening according to the present invention;

[0032] Figure 4 is a method schematic diagram of another embodiment of the air conditioner control method provided by the present invention;

[0033] Figure 5 This is the process of the present invention for performing PID control on the compressor frequency, the internal fan speed and the throttling device opening;

[0034] Figure 6 is a method schematic diagram of another embodiment of the air conditioner control method provided by the present invention;

[0035] Figure 7 is a method schematic diagram of a specific embodiment of the air conditioner control method provided by the present invention;

[0036] Figure 8 is a structural block diagram of an embodiment of the air conditioner control device provided by the present invention;

[0037] Fig. 9 is a structural block diagram of another embodiment of the air conditioner control device provided by the present invention;

[0038] Fig.10It is a structural block diagram of another embodiment of the air conditioner control device provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] In the related technology, most air conditioners can only control the indoor dry bulb temperature. Dehumidification is only a byproduct of the cooling process and cannot accurately reduce the indoor humidity to the range required by the user. However, humidity is also an important factor affecting the comfort of the indoor environment. In order to dehumidify, users often lower the evaporation temperature very low when using air conditioners, which cannot meet the air outlet temperature set by the user. In addition, the internal fan speed does not match the compressor frequency, and the operation process is not energy-efficient. Therefore, how to accurately control the humidity during the cooling process and make the air conditioner run near the optimal state point is an urgent problem to be solved.

[0042] The invention provides a control method for an air conditioner.

[0043] Figure 1 It is a method schematic diagram of an embodiment of the air conditioner control method provided by the present invention.

[0044] like Figure 1 As shown, according to one embodiment of the present invention, the air conditioner control method at least includes step S110, step S120, step S130, step S140 and step S150.

[0045] Step S110, after the air conditioner is turned on and refrigerated, the indoor temperature T ain and indoor relative humidity RHain Determine to enter air supply mode or temperature and humidity control mode.

[0046] Specifically, after the air conditioner receives the instruction to start running in cooling mode, it is determined whether it is in free running mode. The free running mode is specifically a non-set wind gear running mode, that is, no wind gear is set, and the speed of the internal fan changes during operation based on the change of the air conditioner running state. More specifically, after the air conditioner is turned on for cooling, the internal fan is first controlled to start running at the initial speed of the internal fan, and then the indoor temperature T is collected. ain and indoor relative humidity RH ain Determine to enter air supply mode or temperature and humidity control mode.

[0047] In a specific embodiment, according to the indoor temperature T ain and indoor relative humidity RH ain Determining whether to enter the air supply mode or the temperature and humidity control mode may specifically include: determining whether to enter the air supply mode or the temperature and humidity control mode according to the indoor temperature (indoor dry bulb temperature) T ain and indoor relative humidity RH ain Calculate the indoor air humidity d based on the atmospheric pressure P ain , and according to the set temperature T set and set relative humidity RH ain Combined with the atmospheric pressure P, the target indoor air humidity d is calculated. set ; Determine the indoor temperature (indoor dry bulb temperature) T ain Is the difference from the set temperature less than or equal to the preset temperature difference a (i.e., whether T ain -T set ≤a), and indoor air humidity d ain Set the target indoor air humidity set Is the difference less than or equal to the preset moisture content difference b (i.e., whether d ain -d set ≤b), if the indoor temperature (indoor dry bulb temperature) T ain The difference from the set temperature is less than or equal to the preset temperature difference a and the indoor air humidity d ain Set the target indoor air humidity set The difference between the indoor temperature and the indoor dry bulb temperature is less than or equal to the preset humidity difference b, then the air supply mode is determined. ain The difference from the set temperature is greater than the preset temperature difference a, or the indoor air humidity d ain If the difference between the set indoor air target humidity content and the set indoor air target humidity content is greater than the preset humidity content difference b, it is determined to enter the temperature and humidity control mode.

[0048] Step S120: If it is determined to enter the temperature and humidity control mode, the current building load and the corresponding sensible heat ratio of the air conditioner are obtained according to the indoor and outdoor environmental parameters and the setting parameters of the air conditioner.

[0049] Specifically, if it is determined to enter the air supply mode, the indoor fan runs at the indoor fan initial speed, and the outdoor fan and the compressor are not started. If it is determined to enter the temperature and humidity control mode, the indoor fan runs at the indoor fan initial speed, and the outdoor fan is started at the preset outdoor fan initial speed, and the building load Q and the corresponding sensible heat ratio SHR are obtained according to the indoor and outdoor environmental parameters.

[0050] Specifically, the correspondence between different pre-established indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner is obtained; according to the current indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the corresponding relationship, the current building load Q and sensible heat ratio SHR of the air conditioner are obtained. The indoor and outdoor environmental parameters may specifically include: indoor temperature (indoor dry bulb temperature) Tain, indoor relative humidity RHset and outdoor environmental temperature Taout. The setting parameters of the air conditioner may specifically include: set temperature Tset and set relative humidity RHset. More specifically, obtain the correspondence between the pre-established difference ΔT1=Tain-Tset between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain, and the building load Q and the sensible heat ratio SHR of the air conditioner; according to the difference ΔT1=Tain-Tset between the current indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain, obtain the corresponding building load Q and the sensible heat ratio SHR as the current building load Q and the corresponding sensible heat ratio SHR of the air conditioner.

[0051] In a specific embodiment, the pre-established correspondence between the different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and the sensible heat ratio SHR of the air conditioner (the pre-established correspondence between the difference ΔT1=Tain-Tset between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain and the building load Q and the sensible heat ratio SHR) is saved in a database, and the corresponding building load Q and the corresponding sensible heat ratio SHR saved in the database can be read according to the difference ΔT1=Tain-Tset between the current indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain.

[0052] The sensible heat ratio (SHR) is used to describe the ratio of sensible heat to total heat when the air conditioning system processes air. Sensible heat refers to the heat absorbed or released when the air temperature changes, and does not involve water vapor phase change. The total heat includes sensible heat and latent heat. Latent heat refers to the heat absorbed or released by water vapor phase change.

[0053] The correspondence between the pre-established different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner is obtained through the following steps:

[0054] Step 1: Calculate the system cooling capacity Q (i.e., building load Q) and the corresponding sensible heat ratio of the air conditioner each time it is turned on and runs to a stable state based on the operating parameters and indoor and outdoor environmental parameters each time the air conditioner is turned on and runs to a stable state.

[0055] The system cooling capacity when the air conditioner runs to a stable state is the building load Q of the air conditioner. The operating parameters used to calculate the cooling capacity Q (i.e., building load Q) and the corresponding sensible heat ratio may specifically include: evaporator tube temperature Te, condenser tube temperature Tc, outdoor ambient temperature Taout, exhaust temperature Tdis, compressor frequency f, outdoor fan speed no, indoor fan speed ni, indoor temperature Tain, condenser outlet temperature Tcout, and indoor relative humidity RHain.

[0056] Step 2: Based on the calculated system cooling capacity Q and the corresponding sensible heat ratio SHR each time the air conditioner runs to a stable state, as well as the calculated indoor and outdoor environmental parameters and the corresponding setting parameters each time the air conditioner runs to a stable state, a corresponding relationship between the different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and the sensible heat ratio SHR of the air conditioner is established.

[0057] That is, the corresponding relationships between the difference between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset ΔT1=Tain-Tset, the difference between the indoor relative humidity RHset and the set relative humidity RHset ΔRH=RHain-RHset, and the difference between the outdoor ambient temperature Taout and the indoor temperature Tain ΔT2=Taout-Tain and the building load Q and the sensible heat ratio SHR are established.

[0058] The building load Q and SHR are calculated based on the system state parameters after the air conditioner was turned on and ran stably last time. Because the same building is turned on in adjacent time periods and the outdoor temperature does not change much, its building load Q and SHR are certain. Therefore, based on the detected indoor and outdoor working condition parameters and the state of the air conditioner when it was turned on last time, the operating state parameters of the air conditioner when it is stable during this startup can be predicted, so that the air conditioner can converge and stabilize faster.

[0059] Step S130, calculating the compressor frequency, the internal fan speed and the external fan speed of the air conditioner according to the acquired current building load and the corresponding sensible heat ratio of the air conditioner.

[0060] Specifically, the compressor frequency, the internal fan speed and the external fan speed of the air conditioner are calculated based on the current building load and the corresponding sensible heat ratio of the air conditioner, as well as the set temperature, the set relative humidity and the outdoor ambient temperature of the air conditioner.

[0061] The operating parameters may specifically include: compressor frequency f, internal fan speed ni, external fan speed no, and throttling device opening nv. In a specific implementation, according to the set temperature Tset, the set relative humidity RHset, the outdoor ambient temperature Taout, the acquired building load Q and the corresponding sensible heat ratio SHR, the compressor frequency f, the internal fan speed ni, and the external fan speed no are calculated according to the following fitting relationship:

[0062] Compressor frequency: f = C0 + C1T set +C2 RH set +C3T aout +C4Q+C5SHR;

[0063] Internal fan speed: n i =C0+C1T set +C2RHset +C3T aout +C4Q+C5SHR;

[0064] External fan speed: n o =C0+C1T set +C2 RH set +C3T aout +C4Q+C5SHR;

[0065] The above relationship equations are all obtained through fitting, and C0, C1, C2, C3, C4 and C5 are fitting coefficients. The values ​​of the fitting coefficients C0, C1, C2, C3, C4 and C5 in different relationship equations are different.

[0066] Step S140, calculating the opening of the throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameters of the air conditioner.

[0067] The operating state parameters of the air conditioner may specifically include: the temperature in the evaporator tube Te, the temperature in the condenser tube T, the suction saturation temperature T sucsat , Exhaust temperature T dis , saturated pressure drop from the middle of the evaporator to the compressor suction port dTsat,e, saturated temperature drop from the middle of the condenser to the condenser outlet dT sat,c And the saturated temperature drop dT from the throttling device to the middle of the evaporator sat,v .

[0068] Figure 2 A flowchart of a specific implementation of the step of calculating the opening degree of the throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameters of the air conditioner is shown. Figure 2 As shown, the opening degree of the throttling device (such as an electronic expansion valve) can be calculated according to the calculated compressor frequency and the operating state parameters of the air conditioner in accordance with the following steps:

[0069] Step S141, calculate the suction saturation temperature T according to the compressor frequency f, the temperature Te in the evaporator tube and the saturation pressure drop dTsat,e from the middle of the evaporator to the compressor suction port sucsat .

[0070] In a specific embodiment, the intake air saturation temperature T can be calculated using the following fitting relationship: sucsat :

[0071] dTsat,e=(C0+C1f+C2f 2 )

[0072] T sucsat =T e -(C0+C1f+C2f 2)

[0073] Among them, T sucsat is the suction saturation temperature (℃), f is the compressor frequency (unit: HZ), dT sat,e is the saturated temperature drop from the middle of the evaporator to the compressor suction port (°C), Te is the temperature in the evaporator tube (°C), C0, C1, C2 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0074] Step S142, according to the compressor frequency f, the suction saturation temperature T sucsat , Exhaust temperature T dis and the temperature in the condenser tube T c , calculate the suction air dryness x suc .

[0075] In a specific embodiment, the air dryness x can be calculated using the following fitting relationship: suc :

[0076] x suc =C0+C1f+C2T sucsat +C3T c +C4T dis

[0077] Where, f is the compressor operating frequency (unit: HZ), T sucsat is the suction saturation temperature (℃), T c is the temperature in the condenser tube (°C), T dis is the exhaust temperature (°C), C0, C1, C2, C3, and C4 are fitting coefficients. In the present invention, the same fitting coefficients have different values ​​in different fitting equations.

[0078] Step S143, according to the air dryness x suc The size of the superheated suction volume v suc Or two-phase inspiratory specific volume v suc .

[0079] If the air dryness x suc If it is greater than or equal to 1, then calculate the superheated suction volume v suc , if the air dryness x suc If it is less than 1, calculate the two-phase suction specific volume v suc .

[0080] Specifically, if the suction air is overheated, that is, the suction air dryness x suc If it is greater than or equal to 1, then according to the compressor frequency f, suction saturation temperature T sucsat , Exhaust temperature T dis and the temperature in the condenser tube T c , calculate the suction superheat ΔT sucsh, according to the suction superheat ΔT sucsh , Suction air saturation temperature T sucsat and the inspiratory saturation specific volume v sucgsat , calculate the superheated suction volume v suc .

[0081] In a specific embodiment, the suction superheat ΔT can be calculated using the following fitting relationship: sucsh :

[0082] ΔT sucsh =C0+C1f+C2T sucsat +C3T c +C4T dis ;

[0083] Where, f is the compressor operating frequency, T sucsat is the suction saturation temperature, T c is the temperature in the condenser tube, T dis is the exhaust temperature, C0, C1, C2, C3, and C4 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0084] In a specific embodiment, the superheated suction specific volume v can be calculated using the following fitting relationship: suc (m 3 / kg):

[0085] v suc =(C0+C1T sucsat +C2ΔT sucsh )×v sucgsat

[0086] Among them, v sucgsat is the specific volume of the saturated gas inhaled, m 3 / kg.

[0087] If the air contains liquid, the air dryness x suc Less than 1, then according to the air dryness x suc , Inspiratory saturated gas specific volume v sucgsat and the specific volume of the saturated liquid v suclsat , calculate the two-phase inspiratory specific volume v suc , C0, C1, and C2 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0088] In a specific embodiment, the two-phase inspiratory specific volume (m) can be calculated using the following fitting relationship: 3 / kg):

[0089] v suc =(1-x suc )v suclsat +xsuc v sucgsat )

[0090] Among them, v suclsat is the specific volume of the saturated liquid for suction, m 3 / kg.

[0091] Step S144, according to the compressor frequency f, the temperature T in the condenser tube c , Suction air saturation temperature T sucsat , calculate the compressor volumetric efficiency η v .

[0092] In a specific embodiment, the compressor volumetric efficiency η can be calculated using the following fitting relationship: v :

[0093] η v =C0+C1f+C2T c +C3T sucsat

[0094] Wherein, C0, C1, C2, and C3 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0095] Step S145, according to the superheated intake air specific volume v suc Or two-phase inspiratory specific volume v suc , combined with the compressor cylinder volume V rev , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r .

[0096] Specifically, if the air dryness x suc Greater than or equal to 1, according to the compressor cylinder volume V rev 、Superheated suction volume v suc , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r ; If the air dryness x suc Less than 1, according to the compressor cylinder volume V rev , two-phase suction specific volume v suc , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r .

[0097] In a specific embodiment, the circulating refrigerant flow rate M in the system can be calculated using the following fitting relationship: r :

[0098] M r =V rev / v suc×f×η v

[0099] Since the unit of compressor frequency is revolutions per second (i.e., revolutions per second), and the unit of flow rate is kg / h, it needs to be multiplied by 3600 to convert it into hours, i.e., M r =V rev / v suc ×f×η v ×3600.

[0100] Step S146, according to the condenser outlet temperature T Cout Calculate the refrigerant density ρ at the throttling device inlet r,i (kg / m 3 ).

[0101] ρ r,i =C0-C1T Cout

[0102] Wherein, C0 and C1 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations of the present invention are different, for example:

[0103] ρ r,i =1073.78-4.44122T Cout

[0104] Step S147, according to the temperature T in the condenser tube c , Evaporator tube temperature T e , saturated temperature drop from the middle of the condenser to the condenser outlet dT sat,c , and the saturated temperature drop dT from the throttling device to the middle of the evaporator sat,v Calculate the pressure difference between the inlet and outlet of the throttling device Δp r .

[0105] Specifically, the inlet and outlet pressure difference of the throttling device (electronic expansion valve) can be determined by the temperature T in the condenser tube. c , Evaporator tube temperature T e And the saturated temperature drop dT from the middle of the condenser to the condenser outlet sat,c , after throttling by the throttling device (electronic expansion valve) to the saturated temperature drop dT in the middle of the evaporator sat,v Calculated, and the saturated temperature drop dT from the middle of the condenser to the condenser outlet sat,c , throttling device (electronic expansion valve) throttling to the saturated temperature drop dT in the middle of the evaporator sat,v The relationship that can be fitted to the compressor frequency is:

[0106] dT sat,v =C0+C1*f+C2*f 2

[0107] dT sat,v=C0+C1*f+C2*f 2

[0108] Δp r =f(T c ,dT sat,c ,T e ,dT sat,v )=f(f,T c ,T e )=C0+C1Tc+C2Te+C3f+C4f 2

[0109] Wherein, Tc is the temperature in the evaporator tube, Te is the temperature in the condenser tube, f is the compressor frequency, C0, C1, C2, C3, and C4 are fitting coefficients, and the same fitting coefficients in the above fitting relationship have different values.

[0110] Step S148, according to the pressure difference Δp at the inlet and outlet of the throttling device r 、Circulating refrigerant flow rate M in the system r and throttling device inlet refrigerant ρ r,i Calculate the air flow corresponding to the throttling device.

[0111] V air =k c ×M r / ρ r,i [Δp r ] 1 / 2 ;

[0112] Among them, V air is the air flow rate at an atmospheric pressure of 0.1 MPa, k c is the flow coefficient, M r It is the refrigerant flow rate circulating in the system.

[0113] Step S149, according to the calculated air flow V corresponding to the throttling device air , calculate the throttling device opening Pluse.

[0114] The air flow curves (air flow rate vs. opening curves) of different throttling devices (such as electronic expansion valves) are different, which are related to the air flow curves of each valve when it leaves the factory. Therefore, the air flow curve of the throttling device and the calculated air flow V corresponding to the throttling device can be used to calculate the air flow rate V of the throttling device. air Calculate the throttling device opening Pluse:

[0115] pluse=f(V air ).

[0116] The above steps for calculating the throttling device opening can also refer to Figure 3 shown.

[0117] Step S150, controlling the air conditioner to operate according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening.

[0118] Preferably, according to the calculated compressor frequency and the set oil return frequency, the compressor of the air conditioner is controlled to operate according to the calculated compressor frequency and / or according to the set oil return frequency. Specifically, when the calculated compressor frequency f is greater than the set oil return frequency, the compressor is controlled to start and operate at the calculated compressor frequency; when the calculated compressor frequency f is less than the set oil return frequency, the compressor is controlled to start and operate at the set oil return frequency for a second preset time, and then operate at the calculated compressor frequency.

[0119] Figure 4 It is a method schematic diagram of another embodiment of the air conditioner control method provided by the present invention.

[0120] like Figure 4 As shown, according to another embodiment of the present invention, the air conditioner control method further includes step S160.

[0121] Step S160, after controlling the air conditioner to run for a first preset time according to the calculated compressor frequency, inner fan speed, outer fan speed and throttling device opening, PID control is performed on the compressor frequency, inner fan speed and throttling device opening of the air conditioner.

[0122] In a specific implementation, the compressor frequency f of the air conditioner is PID controlled according to the indoor temperature and the set temperature of the air conditioner. Specifically, the compressor frequency is adjusted according to the difference ΔTain (ΔTain=Tain-Tain_set) between the real-time detected indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset and the corresponding change rate δTain of the difference between the indoor temperature and the set temperature (δTain=ΔTain(n)-ΔTain(n-1)).

[0123] More specifically, for the compressor frequency f, at every first preset interval, the difference ΔTain (ΔTain=Tain-Tain_set) between the real-time detected indoor temperature Tain and the set temperature Tset and the corresponding rate of change δTain of the difference between the indoor temperature and the set temperature (δTain=ΔTain(n)-ΔTain(n-1)) are calculated, and at every second preset interval (the second preset interval is an integer multiple of the first preset interval), the difference ΔTain between the indoor temperature Tain and the set temperature Tset (in the second preset interval before) is calculated. The compressor frequency f is adjusted according to the calculated average value ΔTtain_ave of the difference ΔTain between the indoor temperature Tain and the set temperature Tset (ΔTtain_ave = {Tain-Tain_set}) and the corresponding average change rate δTain of the difference between the indoor temperature and the set temperature (δTain_ave = {ΔTain(n)-ΔTain(n-1)}, wherein the adjustment amount δf of the compressor frequency is = k f1 ×ΔTain_ave+k f2 ×δTain_ave, where k f1 and k f2 is a constant and can be obtained through experiments.

[0124] In a specific implementation, the speed ni of the indoor fan of the air conditioner is PID controlled according to the indoor relative humidity and the set relative humidity of the air conditioner. Specifically, the speed of the indoor fan is adjusted according to the difference ΔRHain (ΔRHain=RHain-RHain_set) between the real-time detected relative humidity RHain and the set relative humidity RHset and the corresponding change rate δRHain (δRHain=ΔRHain(n)-ΔRHain(n-1)) of the difference between the indoor relative humidity and the set relative humidity.

[0125] More specifically, for the internal fan speed n, at every first preset interval, the difference ΔRHain (ΔRHain=RHain-RHain_set) between the indoor relative humidity RHain and the set relative humidity RHset and the corresponding rate of change δRHain (δRHain=ΔRHain(n)-ΔRHain(n-1)) of the difference between the indoor relative humidity RHain and the set relative humidity RHset are detected in real time, and at every second preset interval (the second preset interval is an integer multiple of the first preset interval), the difference ΔRHain (ΔRHain=RHain) between the indoor relative humidity RHain and the set relative humidity RHset (within the second preset interval) is calculated. According to the calculated average value ΔRHain_ave of the difference between the indoor relative humidity RHain and the set relative humidity RHset and the corresponding average change rate δRHain_ave of the difference between the indoor relative humidity and the set relative humidity, the speed n of the indoor fan is adjusted, wherein the speed adjustment amount of the indoor fan δn=k n1 ×ΔTain_ave+k n2 ×δRHain_ave, where k n1 and k n2 is a constant and can be obtained through experiments.

[0126] In a specific embodiment, the PID control of the air conditioner and the throttling device opening nv is performed according to the exhaust temperature and the target exhaust temperature. Specifically, according to the difference between the real-time detected exhaust temperature Tdis and the target exhaust temperature Tdis_tar and the change rate δT of the difference between the exhaust temperature and the target exhaust temperature dis_tar (δT dis_tar =ΔT dis_tar (n)-ΔT dis_tar (n-1)) adjusts the opening nv of the throttling device (electronic expansion valve).

[0127] More specifically, for the electronic expansion valve opening nv, the difference ΔT between the exhaust temperature Tdis and the target exhaust temperature Tdis_tar is detected in real time at every first preset interval. dis_tar and the corresponding rate of change of the difference between the exhaust temperature and the target exhaust temperature δT dis_tar (δT dis_tar =ΔT dis_tar (n)-ΔT dis_tar(n-1)); every second preset interval (the second preset interval is an integer multiple of the first preset interval), calculate the difference (ΔT dis =T dis -T dis_tar ) of the average value ΔT dis_ave (ΔT dis_ave ={T dis -T dis_tar}, and the average change rate of the difference between the corresponding exhaust temperature and the target exhaust temperature δT dis_ave (δT dis_ave ={ΔT dis (n)-ΔT dis (n-1)} is adjusted, where the opening adjustment amount of the throttling device (such as an electronic expansion valve) is δnv=k nv1 ×ΔTdis_ave+k nv2 ×δTdis_ave, where k nv1 and k nv2 is a constant and can be obtained through experiments.

[0128] Furthermore, after PID control is performed on the compressor frequency, internal fan speed and throttling device opening of the air conditioner, it is determined whether the absolute value of the difference between the indoor temperature and the set temperature |ΔTain| is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter (that is, the compressor frequency, the internal fan speed and the throttling device correspond to different preset difference thresholds). If so, the current operating parameters are maintained; if not, PID control is continued.

[0129] Specifically, after each adjustment of the compressor frequency f, the indoor fan speed ni and the throttling device opening nv, it is determined whether the absolute value of the difference between the indoor temperature and the set temperature |ΔTain| is less than or equal to the corresponding preset difference threshold, wherein the adjustment of the compressor frequency f, the indoor fan speed ni and the throttling device opening nv can correspond to different preset difference thresholds respectively, for example, the preset difference threshold corresponding to the compressor frequency is x, the preset difference threshold corresponding to the indoor fan speed is y, and the preset difference threshold corresponding to the throttling device opening is z. If the absolute value of the difference between the indoor temperature and the set temperature |ΔTain| is less than or equal to the corresponding preset difference threshold, the current compressor frequency, indoor fan speed and throttling device opening are maintained.

[0130] The above process of PID control of compressor frequency, internal fan speed and throttling device opening can also refer to Figure 5 shown.

[0131] Figure 6It is a schematic diagram of a method of another embodiment of the control method of the air conditioner provided by the present invention.

[0132] As Figure 6 shown, according to another embodiment of the present invention, the control method of the air conditioner further includes step S170 and step S180.

[0133] Step S170, after performing PID control on the compressor frequency, the indoor fan speed, and the opening degree of the throttling device of the air conditioner, when the air conditioner enters a stable state, collect the operating parameters of the air conditioner and the indoor and outdoor environmental parameters.

[0134] Step S180, according to the collected operating parameters of the air conditioner and the indoor and outdoor environmental parameters, calculate the building load Q of the air conditioner and the corresponding sensible heat ratio.

[0135] Specifically, when the absolute value of the difference between the indoor temperature Tain and the set temperature Tset is less than or equal to the preset temperature value Tx (|Tain - Tset| ≤ Tx), and the absolute value of the difference between the indoor relative humidity Rhain and the set indoor relative humidity is less than or equal to the preset humidity value RHx (|RHain - RHset| ≤ RHx), it is determined that the air conditioner enters a stable state.

[0136] The operating parameters used to calculate the cooling capacity Q (i.e., the building load Q) and the corresponding sensible heat ratio may specifically include: the evaporator tube temperature Te, the condenser tube temperature Tc, the exhaust temperature Tdis, the compressor frequency f, the outdoor fan speed no, the indoor fan speed ni, and the condenser outlet temperature Tcout. The indoor and outdoor environmental parameters used include: the indoor temperature Tain, the outdoor environmental temperature Taout, and the indoor relative humidity Rhain.

[0137] According to the calculated building load Q (system cooling capacity Q) of the air conditioner and the corresponding sensible heat ratio SHR, as well as the indoor and outdoor environmental parameters and the corresponding set parameters, update the corresponding relationship between the different indoor and outdoor environmental parameters and the set parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner. That is, update the corresponding relationship between the difference ΔT1 = Tain - Tset between the indoor temperature (indoor dry bulb temperature) Tain and the set temperature Tset, the difference ΔRH = RHain - RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2 = Taout - Tain between the outdoor environmental temperature Taout and the indoor temperature Tain and the building load Q and sensible heat ratio SHR.

[0138] To clearly illustrate the technical solution of the present invention, the execution process of the control method of the air conditioner provided by the present invention will be described below with a specific embodiment.

[0139] Figure 7FIG. 1 is a schematic diagram of a specific embodiment of the air conditioning control method provided by the present invention. Figure 7 As shown, after the air conditioner receives the cooling mode operation start-up instruction, it determines whether the air conditioner is in free operation (no set wind speed) mode. In the free operation mode, the user sets the temperature Tset and the relative humidity RHset. If the relative humidity is not set, it runs in the cooling other operation mode. After the operation instruction is issued, the inner and outer fans of the air conditioning system are started (the inner fan is started at the preset inner fan dehumidification speed, and the outer fan is started at the preset outer fan dehumidification speed), and the indoor and outdoor working parameters are detected, including the indoor ambient temperature (indoor return air dry bulb temperature) T ain , Indoor relative humidity RH ain , Outdoor ambient temperature T aout , and calculate the indoor air humidity d ain Compared with the set indoor air target humidity content d set , compared with the indoor dry bulb temperature T ain With the set temperature T set and compare the indoor air humidity d ain Compared with the set indoor air target humidity content d set , if the indoor dry bulb temperature T ain Less than the set temperature T set -a(T ain -T set ≤a) and the indoor air humidity is d ain The difference between the set indoor air target humidity content d ain -d set ≤b, the ventilation mode is turned on (i.e. the indoor fan is running, and the outdoor fan and compressor are not started), otherwise, the air conditioning temperature and humidity control mode is operated. Then, according to the indoor temperature T ain With the set temperature T set The difference ΔT1 = T ain -T set , set relative humidity RH set and indoor relative humidity RH ain The difference ΔRH=RH ain -RH set , and the outdoor ambient temperature T aout With indoor temperature T ain The difference ΔT2 = T aiout -T set , read the building load Q and corresponding SHR in the database.

[0140] According to the set temperature Tset, the set relative humidity RHset, the outdoor dry bulb temperature (outdoor temperature) Taout, the building load Q and the sensible heat ratio SHR, the compressor frequency f, the initial speed of the internal fan ni, the initial speed of the external fan no and the opening of the electronic expansion valve nv of the user-set target state are calculated. When the calculated compressor frequency f is greater than the set oil return frequency, the compressor starts at the calculated frequency. When the calculated compressor frequency f is less than the set oil return frequency, the compressor starts at the default oil return frequency and runs for 3 minutes, and then runs at the calculated frequency. After running for t1 time with the above compressor frequency, throttling device opening, and internal and external fan speeds, the air conditioner enters the temperature and humidity control PID control module. PID control is performed on the compressor frequency f, the internal fan speed ni, and the electronic expansion valve opening nv.

[0141] When the system enters a stable state after PID control, the operating parameters of the air conditioner are collected in real time, and the system cooling capacity Q and sensible heat ratio SHR are calculated, and the calculated and collected data are updated to the database. Continuous training, optimization, and system initial model parameters make the air conditioning system control more and more accurate and the regulation more and more rapid. If a shutdown command is received, the shutdown procedure is entered.

[0142] The invention also provides a control device for an air conditioner.

[0143] Figure 8 FIG. 1 is a structural block diagram of an embodiment of the air conditioner control device provided by the present invention. Figure 8 As shown, the control device 100 includes: a determination unit 110 , an acquisition unit 120 , a first calculation unit 130 , a second calculation unit 140 and a control unit 150 .

[0144] A determination unit 110 is used to determine whether to enter an air supply mode or a temperature and humidity control mode according to the indoor temperature and the indoor relative humidity after the air conditioner is turned on and operated;

[0145] Specifically, after the air conditioner receives the instruction to start running in cooling mode, it is determined whether it is in free running mode. The free running mode is specifically a non-set wind gear running mode, that is, no wind gear is set, and the speed of the internal fan changes during operation based on the change of the air conditioner running state. More specifically, after the air conditioner is turned on for cooling, the internal fan is first controlled to start running at the initial speed of the internal fan, and then the indoor temperature T is collected. ain and indoor relative humidity RH ain Determine to enter air supply mode or temperature and humidity control mode.

[0146] In a specific embodiment, according to the indoor temperature T ain and indoor relative humidity RH ainDetermining whether to enter the air supply mode or the temperature and humidity control mode may specifically include: determining whether to enter the air supply mode or the temperature and humidity control mode according to the indoor temperature (indoor dry bulb temperature) T ain and indoor relative humidity RH ain Calculate the indoor air humidity d based on the atmospheric pressure P ain , and according to the set temperature T set and set relative humidity RH ain Combined with the atmospheric pressure P, the target indoor air humidity d is calculated. set ; Determine the indoor temperature (indoor dry bulb temperature) T ain Is the difference from the set temperature less than or equal to the preset temperature difference a (i.e., whether T ain -T set ≤a), and indoor air humidity d ain Set the target indoor air humidity set Is the difference less than or equal to the preset moisture content difference b (i.e., whether d ain -d set ≤b), if the indoor temperature (indoor dry bulb temperature) T ain The difference from the set temperature is less than or equal to the preset temperature difference a and the indoor air humidity d ain Set the target indoor air humidity set The difference between the indoor temperature and the indoor dry bulb temperature is less than or equal to the preset humidity difference b, then the air supply mode is determined. ain The difference from the set temperature is greater than the preset temperature difference a, or the indoor air humidity d ain If the difference between the set indoor air target humidity content and the set indoor air target humidity content is greater than the preset humidity content difference b, it is determined to enter the temperature and humidity control mode.

[0147] The acquisition unit 120 is used to acquire the current building load and the corresponding sensible heat ratio of the air conditioner according to the indoor and outdoor environmental parameters and the setting parameters of the air conditioner if the determination unit determines to enter the temperature and humidity control mode.

[0148] Specifically, if it is determined to enter the air supply mode, the indoor fan runs at the indoor fan initial speed, and the outdoor fan and the compressor are not started. If it is determined to enter the temperature and humidity control mode, the indoor fan runs at the indoor fan initial speed, and the outdoor fan is started at the preset outdoor fan initial speed, and the building load Q and the corresponding sensible heat ratio SHR are obtained according to the indoor and outdoor environmental parameters.

[0149] Specifically, the correspondence between different pre-established indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner is obtained; according to the current indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the corresponding relationship, the current building load Q and sensible heat ratio SHR of the air conditioner are obtained. The indoor and outdoor environmental parameters may specifically include: indoor temperature (indoor dry bulb temperature) Tain, indoor relative humidity Rhset and outdoor environmental temperature Taout. The setting parameters of the air conditioner may specifically include: set temperature Tset and set relative humidity Rhset. More specifically, obtain the correspondence between the pre-established difference ΔT1=Tain-Tset between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain, and the building load Q and the sensible heat ratio SHR of the air conditioner; according to the difference ΔT1=Tain-Tset between the current indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain, obtain the corresponding building load Q and the sensible heat ratio SHR as the current building load Q and the corresponding sensible heat ratio SHR of the air conditioner.

[0150] In a specific embodiment, the pre-established correspondence between the different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and the sensible heat ratio SHR of the air conditioner (the pre-established correspondence between the difference ΔT1=Tain-Tset between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain and the building load Q and the sensible heat ratio SHR) is saved in a database, and the corresponding building load Q and the corresponding sensible heat ratio SHR saved in the database can be read according to the difference ΔT1=Tain-Tset between the current indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset, the difference ΔRH=RHain-RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2=Taout-Tain between the outdoor ambient temperature Taout and the indoor temperature Tain.

[0151] The sensible heat ratio (SHR) is used to describe the ratio of sensible heat to total heat when the air conditioning system processes air. Sensible heat refers to the heat absorbed or released when the air temperature changes, and does not involve water vapor phase change. The total heat includes sensible heat and latent heat. Latent heat refers to the heat absorbed or released by water vapor phase change.

[0152] The correspondence between the pre-established different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner is obtained through the following steps:

[0153] Step 1: Calculate the system cooling capacity Q (i.e., building load Q) and the corresponding sensible heat ratio of the air conditioner each time it is turned on and runs to a stable state based on the operating parameters and indoor and outdoor environmental parameters each time the air conditioner is turned on and runs to a stable state.

[0154] The system cooling capacity when the air conditioner runs to a stable state is the building load Q of the air conditioner. The operating parameters used to calculate the system cooling capacity Q (i.e., building load Q) and the corresponding sensible heat ratio may specifically include: evaporator tube temperature Te, condenser tube temperature Tc, outdoor ambient temperature Taout, exhaust temperature Tdis, compressor frequency f, outdoor fan speed no, indoor fan speed ni, indoor temperature Tain, condenser outlet temperature Tcout, and indoor relative humidity RHain.

[0155] Step 2: Based on the calculated system cooling capacity Q and the corresponding sensible heat ratio SHR each time the air conditioner runs to a stable state, as well as the calculated indoor and outdoor environmental parameters and the corresponding setting parameters each time the air conditioner runs to a stable state, a corresponding relationship between the different indoor and outdoor environmental parameters and the setting parameters of the air conditioner and the building load Q and the sensible heat ratio SHR of the air conditioner is established.

[0156] That is, the corresponding relationships between the difference between the indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset ΔT1=Tain-Tset, the difference between the indoor relative humidity RHset and the set relative humidity RHset ΔRH=RHain-RHset, and the difference between the outdoor ambient temperature Taout and the indoor temperature Tain ΔT2=Taout-Tain and the building load Q and the sensible heat ratio SHR are established.

[0157] The first calculation unit 130 is used to calculate the compressor frequency, the internal fan speed and the external fan speed of the air conditioner according to the current building load and the corresponding sensible heat ratio of the air conditioner acquired by the acquisition unit.

[0158] Specifically, the compressor frequency, the internal fan speed and the external fan speed of the air conditioner are calculated based on the current building load and the corresponding sensible heat ratio of the air conditioner, as well as the set temperature, the set relative humidity and the outdoor ambient temperature of the air conditioner.

[0159] The operating parameters may specifically include: compressor frequency f, internal fan speed ni, external fan speed no, and throttling device opening nv. In a specific implementation, according to the set temperature Tset, the set relative humidity RHset, the outdoor ambient temperature Taout, the acquired building load Q and the corresponding sensible heat ratio SHR, the compressor frequency f, the internal fan speed ni, and the external fan speed no are calculated according to the following fitting relationship:

[0160] Compressor frequency: f = C0 + C1T set +C2 RH set +C3T aout +C4Q+C5SHR;

[0161] Internal fan speed: n i =C0+C1T set +C28RH set +C3T aout +C4Q+C5SHR;

[0162] External fan speed: n o =C0+C1T set +C2 RH set +C3T aout +C4Q+C5SHR;

[0163] The above relationship equations are all obtained through fitting, and C0, C1, C2, C3, C4 and C5 are fitting coefficients. The values ​​of the fitting coefficients C0, C1, C2, C3, C4 and C5 in different relationship equations are different.

[0164] The second calculation unit 140 is used to calculate the opening degree of the throttling device of the air conditioner according to the compressor frequency of the air conditioner and the operating state parameters of the air conditioner calculated by the first calculation unit 130.

[0165] The operating state parameters of the air conditioner may specifically include: the temperature in the evaporator tube Te, the temperature in the condenser tube T, the suction saturation temperature T sucsat , Exhaust temperature T dis and c The saturated pressure drop from the middle of the evaporator to the compressor suction port is dTsat,e, and the saturated temperature drop from the middle of the condenser to the condenser outlet is dT sat,c , and the saturated temperature drop dT from the throttling device to the middle of the evaporator sat,v .

[0166] Figure 2 A flowchart of a specific implementation of the step of calculating the opening degree of the throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameters of the air conditioner is shown. Figure 2 As shown, the opening degree of the throttling device (such as an electronic expansion valve) can be calculated according to the calculated compressor frequency and the operating state parameters of the air conditioner in accordance with the following steps:

[0167] Step S141, calculate the suction saturation temperature T according to the compressor frequency f, the temperature Te in the evaporator tube and the saturation pressure drop dTsat,e from the middle of the evaporator to the compressor suction port sucsat .

[0168] In a specific embodiment, the intake air saturation temperature T can be calculated using the following fitting relationship: sucsat :

[0169] dTsat,e=(C0+C1f+C2f 2 )

[0170] T sucsat =T e -(C0+C1f+C2f 2 )

[0171] Among them, T sucsat is the suction saturation temperature (℃), f is the compressor frequency (unit: HZ), dT sat,e is the saturated temperature drop from the middle of the evaporator to the compressor suction port (°C), Te is the temperature in the evaporator tube (°C), C0, C1, C2 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0172] Step S142, according to the compressor frequency f, the suction saturation temperature T sucsat , Exhaust temperature T dis and the temperature in the condenser tube T c , calculate the suction air dryness x suc .

[0173] In a specific embodiment, the air dryness x can be calculated using the following fitting relationship: suc :

[0174] x suc =C0+C1f+C2T sucsat +C3T c +C4T dis

[0175] Where, f is the compressor operating frequency (unit: HZ), T sucsat is the suction saturation temperature (℃), T c is the temperature in the condenser tube (°C), T dis is the exhaust temperature (°C), C0, C1, C2, C3, and C4 are fitting coefficients. In the present invention, the same fitting coefficients have different values ​​in different fitting equations.

[0176] Step S143, according to the air dryness x suc The size of the superheated suction volume v suc Or two-phase inspiratory specific volume v suc .

[0177] If the air dryness x suc If it is greater than or equal to 1, then calculate the superheated suction specific volume v suc , if the air dryness x suc If it is less than 1, calculate the two-phase suction specific volume v suc .

[0178] Specifically, if the suction air is overheated, that is, the suction air dryness x suc If it is greater than or equal to 1, then according to the compressor frequency f, suction saturation temperature T sucsat , Exhaust temperature T dis and the temperature in the condenser tube T c , calculate the suction superheat ΔT sucsh , according to the suction superheat ΔT sucsh , Suction air saturation temperature T sucsat and the inspiratory saturation specific volume v sucgsat , calculate the superheated suction volume v suc .

[0179] In a specific embodiment, the suction superheat ΔT can be calculated using the following fitting relationship: sucsh :

[0180] ΔT sucsh =C0+C1f+C2T sucsat +C3T c +C4T dis ,

[0181] Where, f is the compressor operating frequency, T sucsat is the suction saturation temperature, T c is the temperature in the condenser tube, T dis is the exhaust temperature, C0, C1, C2, C3, and C4 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0182] In a specific embodiment, the superheated suction specific volume v can be calculated using the following fitting relationship: suc (m 3 / kg):

[0183] v suc =(C0+C1T sucsat +C2ΔT sucsh )×v sucgsat

[0184] Among them, vsucgsat is the specific volume of the saturated gas inhaled, m 3 / kg.

[0185] If the air contains liquid, the air dryness x suc Less than 1, then according to the air dryness x suc , Inspiratory saturated gas specific volume v sucgsat and the specific volume of the saturated liquid v suclsat , calculate the two-phase inspiratory specific volume v suc , C0, C1, and C2 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0186] In a specific embodiment, the two-phase inspiratory specific volume (m) can be calculated using the following fitting relationship: 3 / kg):

[0187] v suc =(1-x suc )v suclsat +x suc v sucgsat )

[0188] Among them, v suclsat is the specific volume of the saturated liquid for suction, m 3 / kg.

[0189] Step S144, according to the compressor frequency f, the temperature T in the condenser tube c , Suction air saturation temperature T sucsat , calculate the compressor volumetric efficiency η v .

[0190] In a specific embodiment, the compressor volumetric efficiency η can be calculated using the following fitting relationship: v :

[0191] η v =C0+C1f+C2T c +C3T sucsat

[0192] Wherein, C0, C1, C2, and C3 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations in the present invention are different.

[0193] Step S145, according to the superheated intake air specific volume v suc Or two-phase inspiratory specific volume v suc , combined with the compressor cylinder volume V rev , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r .

[0194] Specifically, if the air dryness xsuc Greater than or equal to 1, according to the compressor cylinder volume V rev 、Superheated suction volume v suc , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r ; If the air dryness x suc Less than 1, according to the compressor cylinder volume V rev , two-phase suction specific volume v suc , compressor frequency f and compressor volumetric efficiency η v , calculate the circulating refrigerant flow M in the system r .

[0195] In a specific embodiment, the circulating refrigerant flow rate M in the system can be calculated using the following fitting relationship: r :

[0196] M r =V rev / v suc ×f×η v

[0197] Since the unit of compressor frequency is revolutions per second (i.e., revolutions per second), and the unit of flow rate is kg / h, it needs to be multiplied by 3600 to convert it into hours, i.e., M r =V rev / v suc ×f×η v ×3600.

[0198] Step S146, according to the condenser outlet temperature T Cout Calculate the refrigerant density ρ at the throttling device inlet r,i (kg / m 3 ).

[0199] ρ r,i =C0-C1T Cout

[0200] Wherein, C0 and C1 are fitting coefficients, and the values ​​of the same fitting coefficients in different fitting equations of the present invention are different, for example:

[0201] ρ r,i =1073.78-4.44122T Cout

[0202] Step S147, according to the temperature T in the condenser tube c , Evaporator tube temperature T e , saturated temperature drop from the middle of the condenser to the condenser outlet dT sat,c , and the saturated temperature drop dT from the throttling device to the middle of the evaporator sat,vCalculate the pressure difference between the inlet and outlet of the throttling device Δp r .

[0203] Specifically, the inlet and outlet pressure difference of the throttling device (electronic expansion valve) can be determined by the temperature T in the condenser tube. c , Evaporator tube temperature T e And the saturated temperature drop dT from the middle of the condenser to the condenser outlet sat,c , after throttling by the throttling device (electronic expansion valve) to the saturated temperature drop dT in the middle of the evaporator sat,v Calculated, and the saturated temperature drop dT from the middle of the condenser to the condenser outlet sat,c , throttling device (electronic expansion valve) throttling to the saturated temperature drop dT in the middle of the evaporator sat,v The relationship that can be fitted to the compressor frequency is:

[0204] dT sat,v =C0+C1*f+C2*f 2

[0205] dT sat,v =C0+C1*f+C2*f 2

[0206] Δp r =f(T c ,dT sat,c ,T e ,dT sat,v )=f(f,T c ,T e )=C0+C1Tc+C2Te+C3f+C4f2

[0207] Wherein, Tc is the temperature in the evaporator tube, Te is the temperature in the condenser tube, f is the compressor frequency, C0, C1, C2, C3, and C4 are fitting coefficients, and the same fitting coefficients in the above fitting relationship have different values.

[0208] Step S148, according to the pressure difference Δp at the inlet and outlet of the throttling device r 、Circulating refrigerant flow rate M in the system r and throttling device inlet refrigerant ρ r,i Calculate the air flow corresponding to the throttling device.

[0209] V air =k c ×M r / ρ r,i [Δp r ] 1 / 2 ;

[0210] Among them, V air is the air flow rate at an atmospheric pressure of 0.1 MPa, k c is the flow coefficient, Mr It is the refrigerant flow rate circulating in the system.

[0211] Step S149, according to the calculated air flow V corresponding to the throttling device air , calculate the throttling device opening (Pluse).

[0212] The air flow curves (air flow rate vs. opening curves) of different throttling devices (such as electronic expansion valves) are different, which are related to the air flow curves of each valve when it leaves the factory. Therefore, the air flow curve of the throttling device and the calculated air flow V corresponding to the throttling device can be used to calculate the air flow rate V of the throttling device. air Calculate the throttling device opening Pluse:

[0213] pluse=f(V air ).

[0214] The above steps for calculating the throttling device opening can also refer to Figure 3 shown.

[0215] The control unit 150 is used to control the air conditioner to operate according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening.

[0216] Preferably, according to the calculated compressor frequency and the set oil return frequency, the compressor of the air conditioner is controlled to operate according to the calculated compressor frequency and / or according to the set oil return frequency. Specifically, when the calculated compressor frequency f is greater than the set oil return frequency, the compressor is controlled to start and operate at the calculated compressor frequency; when the calculated compressor frequency f is less than the set oil return frequency, the compressor is controlled to start and operate at the set oil return frequency for a second preset time, and then operate at the calculated compressor frequency.

[0217] Fig. 9 FIG. 2 is a structural block diagram of another embodiment of the air conditioner control device provided by the present invention. Fig. 9 As shown, the control device 100 further includes: a PID control unit 160 .

[0218] The PID control unit 160 is used to perform PID control on the compressor frequency, inner fan speed and throttling device opening of the air conditioner after controlling the air conditioner to run for a first preset time according to the calculated compressor frequency, inner fan speed, outer fan speed and throttling device opening.

[0219] In a specific implementation, the compressor frequency f of the air conditioner is PID controlled according to the indoor temperature and the set temperature of the air conditioner. Specifically, the compressor frequency is adjusted according to the difference ΔTain (ΔTain=Tain-Tain_set) between the real-time detected indoor temperature (indoor dry-bulb temperature) Tain and the set temperature Tset and the corresponding change rate δTain of the difference between the indoor temperature and the set temperature (δTain=ΔTain(n)-ΔTain(n-1)).

[0220] More specifically, for the compressor frequency f, at every first preset interval, the difference ΔTain (ΔTain=Tain-Tain_set) between the real-time detected indoor temperature Tain and the set temperature Tset and the corresponding rate of change δTain of the difference between the indoor temperature and the set temperature (δTain=ΔTain(n)-ΔTain(n-1)) are calculated, and at every second preset interval (the second preset interval is an integer multiple of the first preset interval), the difference ΔTain between the indoor temperature Tain and the set temperature Tset (in the second preset interval before) is calculated. The compressor frequency f is adjusted according to the calculated average value ΔTtain_ave of the difference ΔTain between the indoor temperature Tain and the set temperature Tset (ΔTtain_ave = {Tain-Tain_set}) and the corresponding average change rate δTain of the difference between the indoor temperature and the set temperature (δTain_ave = {ΔTain(n)-ΔTain(n-1)}, wherein the adjustment amount δf of the compressor frequency is = k f1 ×ΔTain_ave+k f2 ×δTain_ave, where k f1 and k f2 is a constant and can be obtained through experiments.

[0221] In a specific implementation, the speed ni of the indoor fan of the air conditioner is PID controlled according to the indoor relative humidity and the set relative humidity of the air conditioner. Specifically, the speed of the indoor fan is adjusted according to the difference ΔRHain (ΔRHain=RHain-RHain_set) between the real-time detected relative humidity RHain and the set relative humidity RHset and the corresponding change rate δRHain (δRHain=ΔRHain(n)-ΔRHain(n-1)) of the difference between the indoor relative humidity and the set relative humidity.

[0222] More specifically, for the internal fan speed n, at every first preset interval, the difference ΔRHain (ΔRHain=RHain-RHain_set) between the indoor relative humidity RHain and the set relative humidity RHset and the corresponding rate of change δRHain (δRHain=ΔRHain(n)-ΔRHain(n-1)) of the difference between the indoor relative humidity RHain and the set relative humidity RHset are detected in real time, and at every second preset interval (the second preset interval is an integer multiple of the first preset interval), the difference ΔRHain (ΔRHain=RHain) between the indoor relative humidity RHain and the set relative humidity RHset (within the second preset interval) is calculated. According to the calculated average value ΔRHain_ave of the difference between the indoor relative humidity RHain and the set relative humidity RHset and the corresponding average change rate δRHain_ave of the difference between the indoor relative humidity and the set relative humidity, the speed n of the indoor fan is adjusted, wherein the speed adjustment amount of the indoor fan δn=k n1 ×ΔTain_ave+k n2 ×δRHain_ave, where k n1 and k n2 is a constant and can be obtained through experiments.

[0223] In a specific embodiment, the PID control of the air conditioner and the throttling device opening nv is performed according to the exhaust temperature and the target exhaust temperature. Specifically, according to the difference between the real-time detected exhaust temperature Tdis and the target exhaust temperature Tdis_tar and the change rate δT of the difference between the exhaust temperature and the target exhaust temperature dis_tar (δT dis_tar =ΔT dis_tar (n)-ΔT dis_tar (n-1)) adjusts the opening nv of the throttling device (electronic expansion valve).

[0224] More specifically, for the electronic expansion valve opening nv, the difference ΔT between the exhaust temperature Tdis and the target exhaust temperature Tdis_tar is detected in real time at every first preset interval. dis_tar and the corresponding rate of change of the difference between the exhaust temperature and the target exhaust temperature δT dis_tar (δT dis_tar =ΔT dis_tar (n)-ΔT dis_tar(n-1)); every second preset interval (the second preset interval is an integer multiple of the first preset interval), calculate the difference (ΔT dis =T dis -T dis_tar ) of the average value ΔT dis_ave (ΔT dis_ave ={T dis -T dis_tar}, and the average change rate of the difference between the corresponding exhaust temperature and the target exhaust temperature δT dis_ave (δT dis_ave ={ΔT dis (n)-ΔT dis (n-1)} is adjusted, where the opening adjustment amount of the throttling device (such as an electronic expansion valve) is δnv=k nv1 ×ΔTdis_ave+k nv2 ×δTdis_ave, where k nv1 and k nv2 is a constant and can be obtained through experiments.

[0225] like Fig. 9 As shown, further, the control device 100 also includes: a judgment unit 170.

[0226] The judgment unit 170 is used to judge whether the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter after PID control is performed on the compressor frequency, the internal fan speed and the throttling device opening of the air conditioner; the PID control unit is also used to: if the judgment unit judges that the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter, maintain the current operating parameter; otherwise, continue PID control.

[0227] Specifically, after each adjustment of the compressor frequency f, the indoor fan speed ni and the throttling device opening nv, it is determined whether the absolute value of the difference between the indoor temperature and the set temperature |ΔTain| is less than or equal to the corresponding preset difference threshold, wherein the adjustment of the compressor frequency f, the indoor fan speed ni and the throttling device opening nv can correspond to different preset difference thresholds respectively, for example, the preset difference threshold corresponding to the compressor frequency is x, the preset difference threshold corresponding to the indoor fan speed is y, and the preset difference threshold corresponding to the throttling device opening is z. If the absolute value of the difference between the indoor temperature and the set temperature |ΔTain| is less than or equal to the corresponding preset difference threshold, the current compressor frequency, indoor fan speed and throttling device opening are maintained.

[0228] Fig.10It is a structural block diagram of another embodiment of the control device of the air conditioner provided by the present invention. As Fig.10 shown, the control device 100 further includes: an acquisition unit 180 and a third calculation unit 190.

[0229] The acquisition unit 180 is configured to acquire the operating parameters of the air conditioner and the indoor and outdoor environmental parameters when the air conditioner enters a stable state after performing PID control on the compressor frequency, the indoor fan speed, and the opening degree of the throttling device of the air conditioner.

[0230] The third calculation unit 190 is configured to calculate the building load Q of the air conditioner and the corresponding sensible heat ratio according to the operating parameters of the air conditioner and the indoor and outdoor environmental parameters acquired by the acquisition unit.

[0231] Specifically, when the absolute value of the difference between the indoor temperature Tain and the set temperature Tset is less than or equal to a preset temperature value (|Tain - Tset| ≤ Tx), and the absolute value of the difference between the indoor relative humidity Rhain and the set indoor relative humidity is less than or equal to a preset humidity value (|RHain - RHset| ≤ RHx), it is determined that the air conditioner enters a stable state.

[0232] The operating parameters used to calculate the cooling capacity Q (i.e., the building load Q) and the corresponding sensible heat ratio may specifically include: the evaporator tube temperature Te, the condenser tube temperature Tc, the exhaust temperature Tdis, the compressor frequency f, the outdoor fan speed no, the indoor fan speed ni, and the condenser outlet temperature Tcout. The indoor and outdoor environmental parameters used include: the indoor temperature Tain, the outdoor environmental temperature Taout, and the indoor relative humidity Rhain.

[0233] According to the calculated building load Q (system cooling capacity Q) of the air conditioner and the corresponding sensible heat ratio SHR, as well as the indoor and outdoor environmental parameters and the corresponding set parameters, update the corresponding relationship between the different indoor and outdoor environmental parameters and the set parameters of the air conditioner and the building load Q and sensible heat ratio SHR of the air conditioner. That is, update the corresponding relationship between the difference ΔT1 = Tain - Tset between the indoor temperature (indoor dry bulb temperature) Tain and the set temperature Tset, the difference ΔRH = RHain - RHset between the indoor relative humidity RHset and the set relative humidity RHset, and the difference ΔT2 = Taout - Tain between the outdoor environmental temperature Taout and the indoor temperature Tain and the building load Q and sensible heat ratio SHR.

[0234] The present invention also provides a storage medium corresponding to the control method of the air conditioner, on which a computer program is stored, and when the program is executed by a processor, the steps of any of the foregoing methods are implemented.

[0235] The present invention also provides an air conditioner corresponding to the air conditioner control method, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the aforementioned methods when executing the program.

[0236] The present invention also provides an air conditioner corresponding to the control device of the air conditioner, comprising any of the control devices of the air conditioner described above.

[0237] The present invention also provides a computer program product corresponding to the air conditioner control method, comprising a computer program, and when the computer program is executed by a processor, the steps of any of the aforementioned methods are implemented.

[0238] Accordingly, the solution provided by the present invention, according to the technical solution of the present invention, determines the air-conditioning internal fan speed, external fan speed and compressor frequency according to the building load and the sensible heat ratio, and determines the opening of the electronic expansion valve according to the air-conditioning operating status, so as to achieve precise control of humidity during the cooling process of the air-conditioning, thereby improving indoor comfort while achieving energy-saving operation.

[0239] According to the technical solution of the present invention, the compressor frequency, internal and external fan speeds, and electronic expansion valve opening are directly calculated through the detected parameters, thereby shortening the system adjustment cycle and making the operation control more efficient.

[0240] According to the technical solution of the present invention, the corresponding relationship between the air flow rate and the opening degree of the selected electronic expansion valve is fitted to each other, so as to obtain the fitting relationship between the air flow rate-opening degree and the opening degree-air flow rate corresponding to the valve. On the basis of calculating the opening degree of the electronic expansion valve, appropriate exhaust superheat feedback adjustment is performed to meet the reliability and stability of the system operation.

[0241] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0242] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0243] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0244] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the relevant technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0245] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: include: After the air conditioner is turned on and operated, the air supply mode or the temperature and humidity control mode is determined according to the indoor temperature and the indoor relative humidity; If it is determined to enter the temperature and humidity control mode, the current building load and the corresponding sensible heat ratio of the air conditioner are obtained according to the indoor and outdoor environmental parameters and the setting parameters of the air conditioner; Calculating the compressor frequency, the internal fan speed and the external fan speed of the air conditioner according to the current building load and the corresponding sensible heat ratio of the air conditioner; Calculating the opening degree of a throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameter of the air conditioner; The air conditioner is controlled to operate according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening.

2. The method according to claim 1, characterized in that: Determine whether to enter air supply mode or temperature and humidity control mode according to indoor temperature and indoor relative humidity, including: Calculate the indoor air humidity according to the current indoor temperature and indoor relative humidity combined with the atmospheric pressure, and calculate and set the indoor air target humidity according to the set temperature and set relative humidity combined with the atmospheric pressure; Determine whether the difference between the current indoor temperature and the set temperature is less than or equal to a preset temperature difference, and whether the difference between the indoor air humidity content and the set indoor air target humidity content is less than or equal to a preset humidity difference; If it is determined that the difference between the indoor temperature and the set temperature is less than or equal to the preset temperature difference, and the difference between the indoor air humidity and the set indoor air target humidity is less than or equal to the preset humidity difference, it is determined to enter the air supply mode; If it is determined that the difference between the indoor temperature and the set temperature is greater than the preset temperature difference, or the difference between the indoor air humidity content and the set indoor air target humidity content is greater than the preset humidity difference, it is determined to enter the temperature and humidity control mode.

3. The method according to claim 1 or 2, characterized in that: According to indoor and outdoor environmental parameters and setting parameters of the air conditioner, the current building load of the air conditioner and the corresponding sensible heat ratio are obtained, including: Obtaining the corresponding relationship between different pre-established indoor and outdoor environmental parameters and the building load Q and sensible heat ratio SHR of the air conditioner; According to the current indoor and outdoor environmental parameters and the corresponding relationship, the current building load Q and sensible heat ratio SHR of the air conditioner are obtained.

4. The method according to claim 1 or 2, characterized in that: Calculating the opening degree of a throttling device of the air conditioner according to the calculated compressor frequency of the air conditioner and the operating state parameter of the air conditioner, comprising: The suction saturation temperature is calculated based on the compressor frequency, the temperature in the evaporator tube and the saturation pressure drop from the middle of the evaporator to the compressor suction port; The suction gas dryness is calculated based on the compressor frequency, suction gas saturation temperature, exhaust gas temperature and condenser tube temperature; According to the suction air dryness, calculate the superheated suction air specific volume or two-phase suction air specific volume; The compressor volumetric efficiency is calculated based on the compressor frequency, the temperature in the condenser tube, and the temperature in the evaporator tube; Calculate the refrigerant flow rate circulating in the system based on the superheated suction volume or two-phase suction volume, combined with the compressor cylinder volume, compressor frequency and compressor volumetric efficiency; Calculate the refrigerant density at the throttling device inlet according to the condenser outlet temperature; Calculate the inlet and outlet pressure difference of the throttling device based on the temperature in the condenser tube, the temperature in the evaporator tube, the saturated temperature drop from the middle of the condenser to the condenser outlet, and the saturated temperature drop from the throttling device to the middle of the evaporator; The air flow rate corresponding to the throttling device is calculated according to the pressure difference between the inlet and outlet of the throttling device, the circulating refrigerant flow rate in the system and the refrigerant at the inlet of the throttling device; The opening of the throttling device is calculated based on the calculated air flow corresponding to the throttling device.

5. The method according to claim 1 or 2, characterized in that: Controlling the air conditioner to operate according to the calculated compressor frequency, comprising: According to the calculated compressor frequency and the set oil return frequency, controlling the compressor of the air conditioner to operate according to the calculated compressor frequency and / or according to the set oil return frequency; Among them, when the calculated compressor frequency is greater than the set oil return frequency, the compressor is controlled to operate at the calculated compressor frequency; when the calculated compressor frequency is less than the set oil return frequency, the compressor is controlled to start and run at the set oil return frequency for a second preset time, and then operate at the calculated compressor frequency.

6. The method according to claim 1 or 2, characterized in that: Also includes: After controlling the air conditioner to operate for a first preset time according to the calculated compressor frequency, internal fan speed, external fan speed, and throttling device opening, PID control is performed on the compressor frequency, internal fan speed, and throttling device opening of the air conditioner, including: Performing PID control on the compressor frequency f of the air conditioner according to the indoor temperature and the set temperature of the air conditioner; and / or, Performing PID control on the speed of the internal fan of the air conditioner according to the indoor relative humidity and the set relative humidity of the air conditioner; and / or, According to the exhaust temperature and the target exhaust temperature, PID control is performed on the opening of the air conditioner and the throttling device.

7. The method according to claim 6, characterized in that The compressor frequency of the air conditioner is PID controlled according to the indoor temperature and the set temperature of the air conditioner, comprising: The compressor frequency is adjusted according to the difference between the real-time detected indoor temperature and the set temperature and the corresponding rate of change of the difference between the indoor temperature and the set temperature; According to the indoor relative humidity and the set relative humidity of the air conditioner, the speed of the internal fan of the air conditioner is PID controlled, including: The speed of the indoor fan is adjusted according to the difference between the real-time detected relative humidity and the set relative humidity and the change rate of the difference between the corresponding indoor relative humidity and the set relative humidity; According to the exhaust temperature and the target exhaust temperature, PID control is performed on the opening of the air conditioner and the throttling device, including: The opening of the throttling device is adjusted according to the difference between the exhaust temperature detected in real time and the target exhaust temperature and the rate of change of the difference between the exhaust temperature and the target exhaust temperature.

8. The method according to claim 6, characterized in that Also includes: After PID control is performed on the compressor frequency, internal fan speed and throttling device opening of the air conditioner, it is determined whether the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold value corresponding to the corresponding operating parameter; If it is determined that the absolute value of the difference between the indoor temperature and the set temperature is less than or equal to the preset difference threshold corresponding to the corresponding operating parameter, the current operating parameter is maintained; otherwise, PID control is continued.

9. The method according to claim 6, characterized in that Also includes: After the compressor frequency, internal fan speed and throttling device opening of the air conditioner are PID controlled, when the air conditioner enters a stable state, the operating parameters of the air conditioner and indoor and outdoor environmental parameters are collected; The building load Q of the air conditioner and the corresponding sensible heat ratio are calculated according to the collected operating parameters of the air conditioner and indoor and outdoor environmental parameters.

10. A control device for an air conditioner, characterized in that: include: A determination unit, configured to determine whether to enter an air supply mode or a temperature and humidity control mode according to the indoor temperature and the indoor relative humidity after the air conditioner is turned on and operated; an acquisition unit, configured to acquire the current building load and the corresponding sensible heat ratio of the air conditioner according to indoor and outdoor environmental parameters and setting parameters of the air conditioner if the determination unit determines to enter the temperature and humidity control mode; A first calculation unit, configured to calculate a compressor frequency, an inner fan speed, and an outer fan speed of the air conditioner according to a current building load and a corresponding sensible heat ratio of the air conditioner acquired by the acquisition unit; a second calculation unit, configured to calculate the opening degree of the throttling device of the air conditioner according to the compressor frequency of the air conditioner and the operating state parameter of the air conditioner calculated by the first calculation unit; The control unit is used to control the air conditioner to operate according to the calculated compressor frequency, internal fan speed, external fan speed and throttling device opening.

11. A storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, the steps of any method described in claims 1-9 are implemented.

12. An air conditioner, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any method described in claims 1 to 9 when executing the program, or comprises the control device described in claim 10.

13. A computer program product, characterized in that The invention comprises a computer program, which implements the steps of any one of the methods of claims 1 to 9 when being executed by a processor.

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