CN114353281B - Electronic expansion valve control method, electronic expansion valve control device, computer equipment and storage medium - Google Patents
Electronic expansion valve control method, electronic expansion valve control device, computer equipment and storage medium Download PDFInfo
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- CN114353281B CN114353281B CN202111622263.2A CN202111622263A CN114353281B CN 114353281 B CN114353281 B CN 114353281B CN 202111622263 A CN202111622263 A CN 202111622263A CN 114353281 B CN114353281 B CN 114353281B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a control method of an electronic expansion valve, which comprises the following steps: judging the working state of each indoor unit in a heating mode; if the electronic expansion valve is in a standby state, controlling the electronic expansion valve which is matched and arranged to work at a set standby opening; sampling the coil outlet pipe temperature of the indoor heat exchanger; sampling the discharge pressure of the compressor; calling a corresponding condensing temperature; calculating the temperature difference between the temperature of the outlet pipe of the coil pipe and the condensing temperature, and recording the temperature difference as a first temperature difference; judging whether a set valve closing condition is met; if yes, the electronic expansion valve is controlled to execute valve closing control according to the set step number from the setting of the standby opening; judging whether the valve closing exiting condition is met; if yes, recording the current electronic expansion valve opening as the initial noise reduction standby opening and maintaining the current electronic expansion valve opening to work at the initial noise reduction standby opening. A control device, a computer device and a storage medium are also provided. The invention can obtain the initial noise reduction standby opening degree through self-learning so as to meet the dual requirements of stable system and minimum noise.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method and device of an electronic expansion valve suitable for multiple online, computer equipment and a storage medium.
Background
The multi-split air conditioning system comprises at least one outdoor unit and a plurality of indoor units. The indoor unit may be selectively turned on or off according to the use needs of the user. The indoor heat exchanger in the indoor unit is provided with an electronic expansion valve which is corresponding to the indoor heat exchanger and is independently controlled so as to regulate the pressure and/or flow of the refrigerant in the indoor heat exchanger. Considering the oil return reliability of the multi-split air conditioner, the electronic expansion valve corresponding to the indoor unit in a closed state or the indoor unit which is automatically closed when reaching a set temperature still needs to ensure a certain opening degree, and obvious flowing noise can occur when the high-pressure gaseous refrigerant flows through the electronic expansion valve. The common solution in the prior art is to add a capillary tube at the downstream of the electronic expansion valve or wrap damping gel at the outer side of the electronic expansion valve, but the production efficiency of the method is lower.
To solve this problem, a method of controlling noise by adjusting the opening degree of the electronic expansion valve is disclosed in the prior art. Scheme as disclosed in Chinese patent application (CN 113418275A), specification [0015 ] ]Description of the section: "current saturated condensing temperature P based on indoor unit d_t Current outlet refrigerant temperature T C11(n) The step of determining the current opening degree adjustment amount of the internal electronic expansion valve and controlling the opening degree of the internal electronic expansion valve according to the current opening degree adjustment amount specifically comprises the following steps: and the minimum flow opening is required to be kept for a preset stable time immediately after the internal electronic expansion valve is opened, and then the internal electronic expansion valve is controlled. And after the electronic expansion valve is started, controlling the electronic expansion valve to work at the set minimum flow opening, and then executing opening control on the basis of the minimum flow opening. The method has the following defects that firstly, due to the complex indoor and outdoor working conditions of the multi-split air conditioner, the set minimum flow opening can generate noise with higher decibels under partial indoor environment conditions, and the ideal noise reduction effect cannot be achieved; secondly, the deviation between the minimum flow opening and the normal opening which the electronic expansion valve needs to keep is larger, and in the slow adjusting process, the system pressure is higher, so that the performance of the tail end of the air conditioner in the starting state can be influenced.
Disclosure of Invention
Aiming at the technical proposal that after the multi-split air conditioner is started, an electronic expansion valve corresponding to an indoor heat exchanger in a standby state is controlled to work at a set minimum flow opening, and then opening control is executed on the basis of the minimum flow opening so as to reduce noise in the prior art: because of the complex indoor and outdoor working conditions of the multi-split air conditioner, the set minimum flow opening can generate noise with higher decibels under partial indoor environment conditions, the ideal noise reduction effect cannot be achieved, meanwhile, the deviation between the minimum flow opening and the normal opening which needs to be kept by the electronic expansion valve is larger, and in the slow adjustment process, the problem that the performance of the tail end of the air conditioner in a starting state is influenced due to the fact that the system pressure is higher is solved.
The control method of the electronic expansion valve comprises the following steps: judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode; if the indoor unit is in a standby state, controlling an electronic expansion valve which is in fluid connection with the indoor heat exchanger and is arranged in a matched mode to work at a set standby opening; the indoor heat exchanger is arranged in the indoor unit; sampling the coil outlet pipe temperature of the indoor heat exchanger; sampling the discharge pressure of the compressor; calling a condensation temperature corresponding to the exhaust pressure according to the exhaust pressure; calculating the temperature difference between the temperature of the outlet pipe of the coil pipe and the condensing temperature, and recording the temperature difference as a first temperature difference; judging whether the first temperature difference meets a set valve closing condition or not; if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the set standby opening; judging whether the first temperature difference meets the condition of exiting the valve closing; if the first temperature difference meets the exiting valve closing condition, recording the current electronic expansion valve opening as the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
A second aspect of the present invention provides an electronic expansion valve control device comprising: the first judging unit is used for judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode; the first control unit is used for controlling the electronic expansion valve which is in fluid connection with the indoor heat exchanger and is matched with the indoor heat exchanger to work at a set standby opening when the indoor unit is in a standby state; the indoor heat exchanger is arranged in the indoor unit; the first sampling unit is configured to sample the coil pipe temperature of the indoor heat exchanger; a second sampling unit configured to sample a compressor discharge pressure; the calling unit is configured to call the condensation temperature corresponding to the exhaust pressure according to the exhaust pressure; a calculation unit configured to calculate a temperature difference between the coil outlet pipe temperature and the condensing temperature and to record as a first temperature difference; the second judging unit is configured to judge whether the first temperature difference meets a set valve closing condition; a second control unit configured to control the electronic expansion valve to perform valve closing control in accordance with the set number of steps from setting the standby opening degree when the first temperature difference satisfies the set valve closing condition; a third judging unit configured to judge whether the first temperature difference satisfies a withdrawal valve closing condition; and the third control unit is configured to record the current electronic expansion valve opening as the initial noise reduction standby opening and maintain the electronic expansion valve to work at the initial noise reduction standby opening when the first temperature difference meets the exiting valve closing condition.
A third aspect of the present invention includes a computer apparatus including a memory, a processor, and a program stored on the memory and executable by the processor, the processor implementing a method of controlling an electronic expansion valve when executing the program. The control method of the electronic expansion valve comprises the following steps: judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode; if the indoor unit is in a standby state, controlling an electronic expansion valve which is in fluid connection with the indoor heat exchanger and is arranged in a matched mode to work at a set standby opening; the indoor heat exchanger is arranged in the indoor unit; sampling the coil outlet pipe temperature of the indoor heat exchanger; sampling the discharge pressure of the compressor; calling a condensation temperature corresponding to the exhaust pressure according to the exhaust pressure; calculating the temperature difference between the temperature of the outlet pipe of the coil pipe and the condensing temperature, and recording the temperature difference as a first temperature difference; judging whether the first temperature difference meets a set valve closing condition or not; if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the set standby opening; judging whether the first temperature difference meets the condition of exiting the valve closing; if the first temperature difference meets the exiting valve closing condition, recording the current electronic expansion valve opening as the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
A fourth aspect of the present invention provides a storage medium having a computer program stored thereon, which when executed by a processor implements a method of controlling an electronic expansion valve. The control method of the electronic expansion valve comprises the following steps: judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode; if the indoor unit is in a standby state, controlling an electronic expansion valve which is in fluid connection with the indoor heat exchanger and is arranged in a matched mode to work at a set standby opening; the indoor heat exchanger is arranged in the indoor unit; sampling the coil outlet pipe temperature of the indoor heat exchanger; sampling the discharge pressure of the compressor; calling a condensation temperature corresponding to the exhaust pressure according to the exhaust pressure; calculating the temperature difference between the temperature of the outlet pipe of the coil pipe and the condensing temperature, and recording the temperature difference as a first temperature difference; judging whether the first temperature difference meets a set valve closing condition or not; if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the set standby opening; judging whether the first temperature difference meets the condition of exiting the valve closing; if the first temperature difference meets the exiting valve closing condition, recording the current electronic expansion valve opening as the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
Compared with the prior art, the invention has the advantages and positive effects that:
the initial noise reduction standby opening obtained by self-learning can meet the double requirements of the electronic expansion valve on to ensure normal oil return and minimum system noise, and is also the self-adaptive optimal initial noise reduction standby opening corresponding to the installation environment, the use environment, the hardware parameters, the flow curve and the system working pressure of the multi-split air conditioner. Different from the default set minimum flow opening in the prior art, for each indoor unit in a standby state, the actual measurement initial noise reduction standby opening corresponding to the indoor unit is provided, and the accuracy is obviously improved. Meanwhile, the system pressure is not higher, and the normal use of the indoor unit in the starting state is avoided.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an embodiment of a control method of an electronic expansion valve according to the present invention;
FIG. 2 is a flow chart of the control method of the electronic expansion valve provided by the invention after maintaining the electronic expansion valve to work at the initial noise reduction standby opening;
fig. 3 is a flowchart of the control method of the electronic expansion valve provided by the invention after maintaining the electronic expansion valve to work at the corrected noise reduction standby opening.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
The terms first, second, third and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are used to encompass non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
"embodiment" in the present disclosure means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will appreciate that the embodiments described herein may be combined with other embodiments.
Fig. 1 shows a flowchart of a control method of an electronic expansion valve provided by the application. The control method of the electronic expansion valve shown in fig. 1 is suitable for a multi-split air conditioning system. The multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units, wherein at least one compressor is arranged in the outdoor unit. An indoor heat exchanger is arranged in the indoor unit, and the indoor heat exchanger can selectively exchange heat with an aqueous medium or an air medium. The water medium after heat exchange can be used as cold water or hot water and further exchanges heat with air, or the air medium after heat exchange can be directly sent into an air-conditioning room. The indoor heat exchangers are respectively provided with an electronic expansion valve in a matching way, the electronic expansion valves are in fluid connection with the indoor heat exchangers, and the flow and the pressure of the refrigerant entering the indoor heat exchangers are regulated through the electronic expansion valves. The control method of the electronic expansion valve is suitable for a heating mode of a multi-split air conditioning system, and the indoor unit is provided with a control device corresponding to the heating mode, such as a wire controller or a mobile terminal. The multi-split air conditioning system enters a working state when receiving a starting instruction, the compressor enters an operation mode, and the four-way valve controls the flow direction of refrigerant to perform refrigeration or heating. Meanwhile, a user can start the indoor unit and input a set temperature according to the requirements of each air-conditioning room; the indoor unit can also be controlled to enter a standby state. When the ambient temperature in the air-conditioning room reaches the set temperature, the indoor unit also automatically enters a standby state.
The control method of the electronic expansion valve provided by the invention specifically comprises a plurality of steps shown in figure 1.
Step S101: and judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode. The working state of each indoor unit in the multi-split air conditioning system can be read through the corresponding setting information of the wire controller or the mobile terminal.
Step S102: if one or more indoor units in a standby state exist in the multi-split air conditioning system, the following steps are executed; and if the indoor unit in the standby state does not exist in the multi-split air conditioning system, executing normal control.
Step S103: an indoor electronic expansion valve in fluid connection with an indoor heat exchanger in an indoor unit in a standby state is controlled to operate at a set standby opening. The set standby opening is preferably the opening of the electronic expansion valve which needs to be kept for controlling the oil return efficiency of the common multi-split air conditioner, and is far larger than the minimum flow opening (usually between 10pls and 15 pls) of the electronic expansion valve. The standby opening is set to be preferably between 40pls and 60pls, so that the system pressure is firstly ensured to be at a reasonable level, and the operation is stable.
Step S104: sampling coil outlet pipe temperature T of indoor heat exchanger arranged in indoor unit C2 . Temperature T of coil pipe outlet C2 Detected by a temperature sensor disposed at the outlet pipe section of the indoor heat exchanger coil.
Step S105: sampling compressor discharge pressure P d . Exhaust pressure P d Is detected by a pressure sensor provided at the discharge end of the compressor.
Step S106: according to the exhaust pressure P d Invoking condensing temperature P corresponding to exhaust pressure d_t . Exhaust pressure P d And condensation temperature P d_t There is a one-to-one correspondence between them, and the data table corresponding to them is stored in advance for calling at any time.
Step S107: calculating the temperature T of the outlet pipe of the coil pipe C2 And condensation temperature P d_t The temperature difference between them is denoted as the first temperature difference A2. The absolute value of the difference between the two is preferably noted as the first temperature difference A2.
Step S108: further judging whether the first temperature difference A2 meets the set valve closing condition. The set valve closing condition is preferably obtained under laboratory conditions, and a plurality of factors such as the valve opening degree required to be protected for oil return, the caliber of the electronic expansion valve, the flow curve, the indoor environment temperature, the outdoor environment temperature, the working condition of the compressor and the like are comprehensively considered, so that whether the first temperature difference A2 is smaller than a first set temperature difference threshold value is generally set, and the first set temperature difference threshold value is preferably set to be 5 ℃. If the first temperature difference A2 is smaller than 5 ℃, judging that the first temperature difference A2 meets the set valve closing condition.
Step S109: and if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set number of steps from the set standby opening.
Step S110: further judging whether the first temperature difference A2 meets the condition of exiting the valve closing. The exiting valve closing condition is also preferably obtained under laboratory conditions, corresponding to an optimal condition that satisfies normal operation with minimal noise. It is generally set to determine whether the first temperature difference A2 is equal to or greater than a first set temperature difference threshold. If the first temperature difference A2 is greater than or equal to 5 ℃, judging that the first temperature difference A2 meets the exiting valve closing condition.
Step S111: recording the current opening of the electronic expansion valve as the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
The initial noise reduction standby opening degree obtained through the steps can meet the double requirements that the electronic expansion valve is opened to ensure normal oil return and minimum system noise, and is adaptive optimal initial noise reduction standby opening degree corresponding to the installation environment, the use environment, the hardware parameters of the air conditioner, the flow curve and the system working pressure of the multi-split air conditioner. Different from the default set minimum flow opening in the prior art, for each indoor unit in a standby state, the actual measurement initial noise reduction standby opening corresponding to the indoor unit is provided, and the accuracy is obviously improved. Meanwhile, the system pressure is not higher, and the normal use of the indoor unit in the starting state is avoided.
Because the use environment of the multi-split air conditioner is changeable, the indoor unit can be switched on and off at any time according to the use requirement of a user and is switched in different functional modes, the multi-split air conditioner is specially designed to execute a plurality of steps shown in fig. 2 after maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
Step S112: sampling the coil pipe temperature T of the indoor heat exchanger according to a set period C2 The set period may be set to 1 minute.
Step S113: sampling the coil pipe inlet temperature T of the indoor heat exchanger according to a set period C1 Coil pipe inlet temperature T C1 Is detected by a temperature sensor arranged on the inlet pipe of the indoor heat exchanger coil.
Step S114: sampling discharge pressure P of compressor according to set period d And according to the exhaust pressure P d Invoking condensing temperature P corresponding to exhaust pressure d_t 。
Step S115: the first temperature difference A2 is calculated in each set period.
Step S116: calculating the coil inlet temperature T in each set period C1 And condensation temperature P d_t The temperature difference between them is denoted as the second temperature difference A1. Preferably, the coil is fed to a temperature T C1 And condensation temperature P d_t The absolute value of the temperature difference therebetween is noted as a second temperature difference A1.
Step S117: judging whether the first temperature difference A2 and the second temperature difference A1 meet the set valve opening condition at the same time. The valve opening condition is preferably obtained under laboratory conditions, and a plurality of factors such as the valve opening degree required to be protected for oil return, the caliber of the electronic expansion valve, the indoor environment temperature, the outdoor environment temperature, the compressor working condition and the like are comprehensively considered, so that whether the first temperature difference A2 is larger than or equal to the second set temperature difference threshold value and the second temperature difference A1 is larger than the first set temperature difference threshold value are generally set. The second set temperature difference threshold is preferably set to be greater than the first set temperature difference threshold, preferably set to 10 degrees celsius. Namely, when the first temperature difference A2 is more than or equal to 10 ℃ and the second temperature difference A1 is more than 5 ℃, the first temperature difference A2 and the second temperature difference A1 are judged to simultaneously meet the set valve opening condition.
Step S118: while judging whether the first temperature difference A2 and the second temperature difference A1 meet the set valve opening condition at the same time, judging whether the first temperature difference A2 meets the set valve closing condition. The valve closing condition is set in the same manner as in step S108, and will not be described in detail here.
Step S119: if the set valve opening condition is not satisfied, the opening degree of the electronic expansion valve is kept unchanged as the initial noise reduction standby opening degree. If the set valve opening condition is satisfied, the electronic expansion valve is controlled to execute valve opening control according to the set number of steps from the initial noise reduction standby opening.
Step S120: if the set valve closing condition is not satisfied, the opening of the electronic expansion valve is kept unchanged as the initial noise reduction standby opening. If the set valve closing condition is satisfied, the electronic expansion valve is controlled to execute valve closing control according to the set number of steps from the initial noise reduction standby opening.
Step S121: and continuously judging whether one of the first temperature difference A2 and the first temperature difference A1 meets the exiting valve opening condition in the process of executing the valve opening control. The exiting valve-opening condition is also preferably obtained under laboratory conditions, corresponding to an optimal condition that satisfies normal operation with minimal noise. It is generally set to determine whether the first temperature difference A2 is smaller than a first set temperature difference threshold or the second temperature difference A1 is smaller than or equal to a second set temperature difference threshold, that is, if the first temperature difference A2 is smaller than 10 degrees celsius or the second temperature difference A1 is smaller than or equal to 5 degrees celsius, it is determined that the exit valve opening condition is satisfied.
Step S122: the determination as to whether the first temperature difference A2 satisfies the exit valve closing condition is continued also during execution of the valve closing control. If the first temperature difference A2 is greater than or equal to 5 ℃, judging that the first temperature difference A2 meets the exiting valve closing condition.
Step S123: and after the valve-exiting condition is met, recording the current opening of the electronic expansion valve as the corrected noise reduction standby opening, and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening.
Step S124: and after the valve closing exiting condition is met, recording the current electronic expansion valve opening as the corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening.
Through the steps, namely after the initial noise reduction standby opening is determined, the initial noise reduction standby opening is continuously corrected according to the system pressure and the environment temperature, so that the initial noise reduction standby opening is matched with the real working condition, dynamic calibration is realized, and the normal operation of the system and the minimum noise are ensured.
After maintaining the electronic expansion valve operating at the corrected noise reduction standby opening, a step as shown in fig. 3 is also devised.
Step S126: and keeping to judge whether the first temperature difference and the second temperature difference meet the set valve opening condition at the same time and judging whether the first temperature difference meets the set valve closing condition.
Step S127: if the set valve opening condition is met, controlling the electronic expansion valve to execute valve opening control according to the set step number from the correction noise reduction standby opening of the last set period; if the set valve closing condition is met, the electronic expansion valve is controlled to execute valve closing control according to the set step number from the correction noise reduction standby opening of the last set period, so that the dynamic control of the opening of the electronic expansion valve is realized.
The initial noise reduction standby opening and the calibration noise reduction standby opening are self-learning optimal openings comprehensively considering a plurality of factors such as valve opening required to be protected for oil return, caliber of an electronic expansion valve, flow curve, indoor environment temperature, outdoor environment temperature, compressor working condition and the like. The initial noise reduction starting opening and the calibration noise reduction standby opening are stored in a storage unit of a main control processor of the multi-split air conditioning system for calling at any time. The system keeps monitoring the startup instruction of the multi-split air conditioning system. When a starting instruction is sampled, namely the multi-split air conditioning system is started again, the electronic expansion valve is controlled to work at the initial noise reduction standby opening or the calibrated noise reduction standby opening, so that the noise is quickly reduced, the noise is always kept at a very low level, and sharp high decibel noise when the air conditioning system is started at the minimum flow opening in the prior art can not occur. After which dynamic control is performed in accordance with the specifics of the first temperature difference and/or the second temperature difference, the system noise is always maintained at a low desired level.
Preferably, when the control electronic expansion valve performs the valve opening control according to the set number of steps, the control electronic expansion valve increases the valve opening by the set number of steps in each valve adjustment setting period. When the control electronic expansion valve executes valve closing control according to the set step number, the control electronic expansion valve reduces the set step number in each valve adjusting set period. The first valve setting period is preferably 2 minutes, and the second valve setting period is preferably 1 minute. The number of steps is preferably 1pls. The first set valve setting period is preferably set to be greater than the second set valve setting period, i.e., the valve opening speed is less than the valve closing speed.
A second aspect of the present invention provides an electronic expansion valve control device. The control device is composed of the following units.
The first judging unit is used for judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode. The working state of each indoor unit in the multi-split air conditioning system can be read through the corresponding setting information of the wire controller or the mobile terminal.
The first control unit is used for controlling the electronic expansion valve which is in fluid connection with the indoor heat exchanger and is matched with the indoor heat exchanger to work at a set standby opening when the indoor unit is in a standby state; wherein, the setting standby aperture is larger than the minimum flow aperture of the electronic expansion valve, and the indoor heat exchanger is arranged in the indoor unit. The set standby opening is preferably between 40pls and 60 pls.
A first sampling unit configured to sample a coil outlet pipe temperature T of the indoor heat exchanger C2 . Temperature T of coil pipe outlet C2 Detected by a temperature sensor disposed at the outlet pipe section of the indoor heat exchanger coil.
A second sampling unit configured to sample the compressor discharge pressure P d . Exhaust pressure P d Is detected by a pressure sensor provided at the discharge end of the compressor.
A calling unit configured to respond to the exhaust pressure P d Invoking condensing temperature P corresponding to exhaust pressure d_t . Exhaust pressure P d And condensation temperature P d_t There is a one-to-one correspondence between them, and the data table corresponding to them is stored in advance for calling at any time.
A calculation unit configured to calculate a coil outlet pipe temperature T C2 And condensation temperature P d_t The temperature difference between them is also denoted as the first temperature difference A2. The absolute value of the difference between the two is preferably noted as the first temperature difference A2.
And the second judging unit is configured to judge whether the first temperature difference meets the set valve closing condition. The set valve closing condition is preferably obtained under laboratory conditions, and a plurality of factors such as the valve opening degree required to be protected for oil return, the caliber of the electronic expansion valve, the indoor environment temperature, the outdoor environment temperature, the compressor working condition and the like are comprehensively considered, so that whether the first temperature difference A2 is smaller than a first set temperature difference threshold value is generally set, and the first set temperature difference threshold value is preferably set to be 5 ℃. If the first temperature difference A2 is smaller than 5 ℃, judging that the first temperature difference A2 meets the set valve closing condition.
And a second control unit configured to control the electronic expansion valve to perform valve closing control in accordance with the set number of steps from setting the standby opening degree when the first temperature difference satisfies the set valve closing condition.
And a third judging unit configured to judge whether the first temperature difference satisfies the exit valve closing condition. The exiting valve closing condition is also preferably obtained under laboratory conditions, corresponding to an optimal condition that satisfies normal operation with minimal noise. It is generally set to determine whether the first temperature difference A2 is equal to or greater than a first set temperature difference threshold. If the first temperature difference A2 is greater than or equal to 5 ℃, judging that the first temperature difference A2 meets the exiting valve closing condition.
And the third control unit is configured to record the current electronic expansion valve opening as the initial noise reduction standby opening and maintain the electronic expansion valve to work at the initial noise reduction standby opening when the first temperature difference meets the exiting valve closing condition.
The electronic expansion valve control device provided by the invention can ensure that the electronic expansion valve is opened to ensure the double requirements of normal oil return and minimum system noise, and simultaneously, is an adaptive optimal initial noise reduction standby opening corresponding to the installation environment, the use environment, the hardware parameters and the flow curve of the multi-split air conditioner, and the working pressure of the system. Different from the default set minimum flow opening in the prior art, for each indoor unit in a standby state, the actual measurement initial noise reduction standby opening corresponding to the indoor unit is provided, and the accuracy is obviously improved. Meanwhile, the system pressure is not higher, and the normal use of the indoor unit in the starting state is avoided.
In one embodiment, a computer device, which may be a server, is provided that includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used for storing working condition parameter data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by a processor implements a method of controlling an electronic expansion valve.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of: judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode;
If the indoor unit is in a standby state, controlling an electronic expansion valve which is in fluid connection with the indoor heat exchanger and is arranged in a matched mode to work at a set standby opening; the indoor heat exchanger is arranged in the indoor unit;
sampling the coil outlet pipe temperature of the indoor heat exchanger;
sampling the discharge pressure of the compressor;
calling a condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
calculating the temperature difference between the temperature of the outlet pipe of the coil pipe and the condensing temperature, and recording the temperature difference as a first temperature difference;
judging whether the first temperature difference meets a set valve closing condition or not;
if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the set standby opening;
judging whether the first temperature difference meets the condition of exiting the valve closing;
if the first temperature difference meets the exiting valve closing condition, recording the current electronic expansion valve opening as the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening.
In one embodiment, the processor when executing the computer program further performs the steps of: after maintaining the electronic expansion valve to work at the initial noise reduction standby opening, the electronic expansion valve control method further comprises the following steps:
Sampling the coil pipe temperature of the indoor heat exchanger according to a set period;
sampling the coil pipe inlet temperature of the indoor heat exchanger according to a set period;
sampling the exhaust pressure of the compressor according to a set period, and calling the condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
calculating a first temperature difference in each set period;
calculating the temperature difference between the coil inlet temperature and the condensing temperature in each set period, and recording the temperature difference as a second temperature difference;
judging whether the first temperature difference and the second temperature difference meet the set valve opening condition at the same time, and judging whether the first temperature difference meets the set valve closing condition;
if the first temperature difference and the second temperature difference simultaneously meet the set valve opening condition, controlling the electronic expansion valve to execute valve opening control according to the set step number from the initial noise reduction standby opening;
judging whether one of the first temperature difference and the second temperature difference meets the exiting valve opening condition;
if one of the first temperature difference and the second temperature difference meets the exiting valve opening condition, recording the current electronic expansion valve opening as the corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening;
if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the initial noise reduction standby opening;
Judging whether the first temperature difference meets the condition of exiting the valve closing;
if the first temperature difference meets the valve closing condition, recording the current opening of the electronic expansion valve as the corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening.
In one embodiment, the processor when executing the computer program further performs the steps of: after maintaining the electronic expansion valve to work at the corrected noise reduction standby opening, the electronic expansion valve control method further comprises the following steps:
maintaining and judging whether the first temperature difference and the second temperature difference meet the set valve opening condition at the same time and judging whether the first temperature difference meets the set valve closing condition;
if the set valve opening condition is met, controlling the electronic expansion valve to execute valve opening control according to the set step number from the correction noise reduction standby opening of the last set period; if the set valve closing condition is satisfied, the electronic expansion valve is controlled to execute valve closing control according to the set number of steps from the correction noise reduction standby opening of the last set period.
In one embodiment, the processor when executing the computer program further performs the steps of: storing an initial noise reduction standby opening;
monitoring whether a startup instruction of the multi-split air conditioning system is received;
and when the starting instruction is sampled, controlling the electronic expansion valve to work at the initial noise reduction standby opening.
In one embodiment, the processor when executing the computer program further performs the steps of: if the first temperature difference is greater than or equal to the second set temperature difference threshold value and the second temperature difference is greater than the first set temperature difference threshold value, judging that the first temperature difference and the second temperature difference simultaneously meet the set valve opening condition;
if the first temperature difference is smaller than the second set temperature difference threshold value or the second temperature difference is smaller than or equal to the first set temperature difference threshold value, judging that the valve-exiting opening condition is met;
wherein the first set temperature difference threshold is less than the second set temperature difference threshold.
In one embodiment, the processor when executing the computer program further performs the steps of: if the first temperature difference is smaller than a first set temperature difference threshold value, judging that the first temperature difference meets a set valve closing condition;
and if the first temperature difference is greater than or equal to a first set temperature difference threshold value, judging that the first temperature difference meets the exiting valve closing condition.
In one embodiment, the processor when executing the computer program further performs the steps of: when the electronic expansion valve is controlled to execute valve opening control according to the set step number, the electronic expansion valve is controlled to increase the valve opening by the set step number in each first valve adjusting setting period;
when the electronic expansion valve is controlled to be closed according to the set steps, the electronic expansion valve is controlled to reduce the valve opening by the set steps in each second valve adjusting set period;
Wherein the first set valve adjustment period is greater than the second set valve adjustment period.
The embodiment of the application also provides a computer storage medium, wherein the computer storage medium is stored in a computer program for electronic data exchange, and the computer program enables an electronic expansion valve in a multi-connected air conditioning system to execute part or all of the steps of any one of the methods described in the embodiment of the method.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and the division of, for example, the above units or modules is merely a logical function division, and there may be other manners of dividing the actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or units, which may be in electrical or other form.
The units described as separate components may or may not be physically separate, and components displayed as units may or may not be physical units, that is, may be located in one physical space, or may be distributed over a plurality of network units, where some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. The electronic expansion valve control method is characterized by comprising the following steps of:
judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode;
if the indoor unit is in a standby state, controlling an electronic expansion valve which is in fluid connection with the indoor heat exchanger and is arranged in a matched mode to work at a set standby opening; the indoor heat exchanger is arranged in the indoor unit;
sampling the coil outlet pipe temperature of the indoor heat exchanger;
sampling the discharge pressure of the compressor;
calling a condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
calculating the temperature difference between the coil outlet pipe temperature and the condensing temperature, and recording the temperature difference as a first temperature difference;
judging whether the first temperature difference meets a set valve closing condition or not;
if the first temperature difference meets a set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to a set step number from the set standby opening;
judging whether the first temperature difference meets the condition of exiting the valve closing;
if the first temperature difference meets the exiting valve closing condition, recording that the current electronic expansion valve opening is the initial noise reduction standby opening and maintaining the electronic expansion valve to work at the initial noise reduction standby opening;
Sampling the temperature of a coil outlet pipe of the indoor heat exchanger according to a set period;
sampling the coil pipe inlet temperature of the indoor heat exchanger according to a set period;
sampling the exhaust pressure of a compressor according to a set period, and calling the condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
calculating the first temperature difference in each set period;
calculating the temperature difference between the coil inlet temperature and the condensing temperature in each set period, and recording the temperature difference as a second temperature difference;
judging whether the first temperature difference and the second temperature difference meet a set valve opening condition at the same time, and judging whether the first temperature difference meets a set valve closing condition;
if the first temperature difference and the second temperature difference simultaneously meet the set valve opening condition, controlling the electronic expansion valve to execute valve opening control according to the set step number from the initial noise reduction standby opening;
judging whether one of the first temperature difference and the second temperature difference meets a valve-exiting condition;
if one of the first temperature difference and the second temperature difference meets the valve-exiting condition, recording the current electronic expansion valve opening as a corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening;
Or alternatively, the process may be performed,
if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the initial noise reduction standby opening;
judging whether the first temperature difference meets the condition of exiting the valve closing;
if the first temperature difference meets the valve closing condition, recording that the current opening of the electronic expansion valve is a corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening;
maintaining and judging whether the first temperature difference and the second temperature difference meet a set valve opening condition at the same time and judging whether the first temperature difference meets a set valve closing condition;
if the set valve opening condition is met, controlling the electronic expansion valve to execute valve opening control according to the set step number from the correction noise reduction standby opening of the last set period; and if the set valve closing condition is met, controlling the electronic expansion valve to execute valve closing control according to the set step number from the correction noise reduction standby opening of the last set period.
2. The electronic expansion valve control method according to claim 1, characterized in that:
storing the corrected noise reduction standby opening;
monitoring whether a startup instruction of the multi-split air conditioning system is received;
and when the starting instruction is sampled, controlling the electronic expansion valve to work at the corrected noise reduction standby opening.
3. The electronic expansion valve control method according to claim 2, characterized in that:
if the first temperature difference is larger than or equal to a second set temperature difference threshold value and the second temperature difference is larger than a first set temperature difference threshold value, judging that the first temperature difference and the second temperature difference simultaneously meet a set valve opening condition;
if the first temperature difference is smaller than a second set temperature difference threshold value or the second temperature difference is smaller than or equal to the first set temperature difference threshold value, judging that the valve-exiting opening condition is met;
wherein the first set temperature difference threshold is less than the second set temperature difference threshold.
4. The electronic expansion valve control method according to claim 2, characterized in that:
if the first temperature difference is smaller than a first set temperature difference threshold value, judging that the first temperature difference meets a set valve closing condition;
and if the first temperature difference is greater than or equal to a first set temperature difference threshold value, judging that the first temperature difference meets the exiting valve closing condition.
5. The electronic expansion valve control method according to claim 2, characterized in that:
when the electronic expansion valve is controlled to execute valve opening control according to the set step number, the electronic expansion valve is controlled to increase the valve opening by the set step number in each first valve adjusting setting period;
When the electronic expansion valve is controlled to be closed according to the set steps, the electronic expansion valve is controlled to reduce the valve opening by the set steps in each second valve adjusting set period;
wherein the first set valve adjustment period is greater than the second set valve adjustment period.
6. An electronic expansion valve control device, characterized by comprising:
the first judging unit is used for judging the working state of each indoor unit in the multi-split air conditioning system in a heating mode;
the first control unit is used for controlling the electronic expansion valve which is in fluid connection with the indoor heat exchanger and is matched with the indoor heat exchanger to work at a set standby opening degree when the indoor unit is in a standby state; the indoor heat exchanger is arranged in the indoor unit;
a first sampling unit configured to sample a coil outlet tube temperature of the indoor heat exchanger;
a second sampling unit configured to sample a compressor discharge pressure;
the calling unit is configured to call the condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
A calculation unit configured to calculate a temperature difference between the coil outlet pipe temperature and the condensing temperature and to record as a first temperature difference;
the second judging unit is configured to judge whether the first temperature difference meets a set valve closing condition or not;
a second control unit configured to control the electronic expansion valve to perform valve closing control in accordance with a set number of steps from the set standby opening when the first temperature difference satisfies a set valve closing condition;
a third judging unit configured to judge whether the first temperature difference satisfies a withdrawal valve closing condition; and
the third control unit is configured to record the current opening of the electronic expansion valve as an initial noise reduction standby opening and maintain the electronic expansion valve to work at the initial noise reduction standby opening when the first temperature difference meets the exiting valve closing condition;
after maintaining the electronic expansion valve to work at the initial noise reduction standby opening, sampling the coil pipe temperature of the indoor heat exchanger according to a set period;
sampling the coil pipe inlet temperature of the indoor heat exchanger according to a set period;
sampling the exhaust pressure of a compressor according to a set period, and calling the condensation temperature corresponding to the exhaust pressure according to the exhaust pressure;
Calculating the first temperature difference in each set period;
calculating the temperature difference between the coil inlet temperature and the condensing temperature in each set period, and recording the temperature difference as a second temperature difference;
judging whether the first temperature difference and the second temperature difference meet a set valve opening condition at the same time, and judging whether the first temperature difference meets a set valve closing condition;
if the first temperature difference and the second temperature difference simultaneously meet the set valve opening condition, controlling the electronic expansion valve to execute valve opening control according to the set step number from the initial noise reduction standby opening;
judging whether one of the first temperature difference and the second temperature difference meets a valve-exiting condition;
if one of the first temperature difference and the second temperature difference meets the valve-exiting condition, recording the current electronic expansion valve opening as a corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening;
or alternatively, the process may be performed,
if the first temperature difference meets the set valve closing condition, controlling the electronic expansion valve to execute valve closing control according to the set step number from the initial noise reduction standby opening;
judging whether the first temperature difference meets the condition of exiting the valve closing;
if the first temperature difference meets the valve closing condition, recording that the current opening of the electronic expansion valve is a corrected noise reduction standby opening and maintaining the electronic expansion valve to work at the corrected noise reduction standby opening;
Maintaining and judging whether the first temperature difference and the second temperature difference meet a set valve opening condition at the same time and judging whether the first temperature difference meets a set valve closing condition;
if the set valve opening condition is met, controlling the electronic expansion valve to execute valve opening control according to the set step number from the correction noise reduction standby opening of the last set period; and if the set valve closing condition is met, controlling the electronic expansion valve to execute valve closing control according to the set step number from the correction noise reduction standby opening of the last set period.
7. A computer device comprising a memory, a processor and a program stored on the memory and executable by the processor, characterized in that the processor implements the control method according to any one of claims 1 to 5 when executing the program.
8. A storage medium having stored thereon a computer program, which when executed by a processor implements the control method according to any one of claims 1 to 5.
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