CN112628984A - Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner - Google Patents

Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner Download PDF

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Publication number
CN112628984A
CN112628984A CN202011480626.9A CN202011480626A CN112628984A CN 112628984 A CN112628984 A CN 112628984A CN 202011480626 A CN202011480626 A CN 202011480626A CN 112628984 A CN112628984 A CN 112628984A
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China
Prior art keywords
temperature
air conditioner
electronic expansion
expansion valve
superheat degree
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CN202011480626.9A
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Chinese (zh)
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CN112628984B (en
Inventor
郑根
谭双
张美扬
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention provides a control method and device for an electronic expansion valve of an air conditioner indoor unit and an air conditioner, and relates to the technical field of air conditioners. The control method of the electronic expansion valve of the air conditioner indoor unit comprises the following steps: the method comprises the steps of obtaining the ambient temperature of an air conditioner indoor unit and the set temperature of the air conditioner when the air conditioner operates in a refrigerating mode. And calculating the difference between the environment temperature and the set temperature to obtain the temperature shutdown temperature difference. And if the difference value of the temperature-reaching shutdown temperature is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, improving the target superheat degree of an evaporator of the indoor unit of the air conditioner, wherein the first preset adjusting temperature represents that the air conditioner has the critical temperature of the temperature-reaching shutdown trend. And carrying out fuzzy control on an electronic expansion valve of an air conditioner indoor unit according to the target superheat degree so as to reduce the refrigerating output of the air conditioner. The control method and device for the electronic expansion valve of the air conditioner internal unit and the air conditioner can control the refrigerating capacity of the air conditioner, and effectively avoid frequent startup and shutdown.

Description

Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for an electronic expansion valve of an air conditioner indoor unit and an air conditioner.
Background
The electronic expansion valve is a common throttling element of the air-conditioning system, compared with a capillary throttling mode, the electronic expansion valve can adjust the size of the throttling caliber, and is suitable for the air-conditioning system with wide environmental application range and large system flow, such as a frequency converter, a multi-split air-conditioning system and the like.
At present, the opening degree of an electronic expansion valve is controlled by superheat degree, so that a refrigerant at an outlet of an evaporator has a certain superheat degree, the suction of a compressor is ensured, liquid is not carried, and the working safety of the compressor is ensured.
However, the control concept of the electronic expansion valve in the related art is difficult to solve the problem that the air conditioner is prone to frequent warm-up shutdown when the refrigeration of the air conditioner is close to the warm-up shutdown (that is, the ambient temperature is close to the set temperature), which affects the user experience.
Disclosure of Invention
One of the objectives of the present invention includes providing a control method for an electronic expansion valve of an air conditioner internal unit, which can control the refrigerating capacity of the air conditioner to avoid frequent start-up and shut-down.
Another object of the present invention includes providing a control device for an electronic expansion valve of an air conditioner indoor unit, which can control the cooling capacity of the air conditioner to avoid frequent start-up and shut-down.
Still another object of the present invention includes providing an air conditioner capable of controlling a cooling capacity of the air conditioner to avoid frequent on-and-off operations.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a control method for an electronic expansion valve of an air conditioner indoor unit, which is applied to an air conditioner, and comprises the following steps:
acquiring the ambient temperature of an indoor unit of the air conditioner and the set temperature of the air conditioner during the refrigerating operation of the air conditioner;
calculating the difference value between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference value;
if the difference value of the temperature-reaching shutdown temperature is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature, improving the target superheat degree of an evaporator of the air conditioner indoor unit, wherein the first preset adjusting temperature represents that the air conditioner has a critical temperature of the temperature-reaching shutdown trend;
and carrying out fuzzy control on an electronic expansion valve of the air conditioner indoor unit according to the target superheat degree so as to reduce the refrigerating output of the air conditioner.
According to the control method of the electronic expansion valve of the air conditioner indoor unit, provided by the embodiment of the invention, under the condition that the temperature difference value of the temperature-reaching shutdown is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, the air conditioner can be considered to have the trend of temperature-reaching shutdown, the target superheat degree of the evaporator is increased through setting, and the electronic expansion valve is subjected to fuzzy control according to the increased target superheat degree, so that the electronic expansion valve is continuously closed, the flow of a refrigerant is further reduced, the output of refrigerating capacity is controlled to be reduced, the air conditioner is enabled to work at relatively small refrigerating capacity, and frequent startup and shutdown are avoided.
Further, in an optional embodiment, if the difference between the temperature-reaching shutdown temperature and the temperature-reaching shutdown temperature is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature, the step of increasing the target superheat degree of the evaporator of the indoor unit of the air conditioner comprises:
if the difference value of the temperature-reaching shutdown temperature is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, the target superheat degree is increased along with the decrease of the difference value of the temperature-reaching shutdown temperature, and the absolute value of the ratio of the target superheat degree to the difference value of the temperature-reaching shutdown temperature is increased along with the decrease of the difference value of the temperature-reaching shutdown temperature.
Further, in an optional embodiment, if the temperature-to-temperature shutdown temperature difference is smaller than a first preset adjustment temperature and larger than a second preset adjustment temperature, the step of increasing the target superheat degree of the evaporator of the indoor unit of the air conditioner comprises:
if the difference value of the temperature-reaching shutdown temperature is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, setting the target superheat degree according to the following relational expression:
T＝TA+K×(ΔTa-A)2，
wherein T represents the target superheat degree, TA represents a target superheat initial value of the evaporator cooling operation, K represents a proportionality coefficient, Δ TA represents the to-warm shutdown temperature difference, and a represents the first preset regulation temperature.
Further, in an optional embodiment, the control method further comprises:
and if the difference value of the temperature-reaching shutdown temperature is greater than or equal to the first preset adjusting temperature, setting the target superheat degree as a target superheat initial value of the evaporator in refrigeration operation.
Further, in an optional embodiment, the control method further comprises:
and if the difference value of the temperature-reaching shutdown temperature is less than or equal to the second preset adjusting temperature, controlling the compressor of the air conditioner to shutdown and enabling the electronic expansion valve to recover to the initial opening degree.
Further, in an optional embodiment, the control method further comprises:
and if the difference value of the temperature-reaching shutdown temperatures is less than or equal to the second preset adjusting temperature, controlling the electronic expansion valves of the air conditioner internal units to be closed or adjusted to the minimum opening degree.
Further, in an optional embodiment, the step of fuzzy controlling an electronic expansion valve of the air conditioner indoor unit according to the target superheat degree comprises:
acquiring the real-time superheat degree of the evaporator;
if the real-time superheat degree is larger than the sum of the target superheat degree and a first preset superheat degree, controlling the opening degree of the electronic expansion valve to increase;
if the real-time superheat degree is smaller than the difference value of the target superheat degree minus a second preset superheat degree, controlling the opening degree of the electronic expansion valve to be reduced;
and if the real-time superheat degree is greater than or equal to the difference value of the target superheat degree minus the second preset superheat degree and is less than or equal to the sum of the target superheat degree plus the first preset superheat degree, controlling the electronic expansion valve to keep the current opening.
In a second aspect, the present invention provides a control device for an electronic expansion valve of an air conditioner indoor unit, which is applied to an air conditioner, and comprises:
the acquisition module is used for acquiring the ambient temperature of an air conditioner indoor unit and the set temperature of the air conditioner when the air conditioner operates in a refrigerating mode;
the calculation module is used for calculating the difference value between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference value;
the setting module is used for increasing the target superheat degree of an evaporator of the indoor unit of the air conditioner if the temperature-reaching shutdown temperature difference value is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature;
and the control module is used for carrying out fuzzy control on the electronic expansion valve of the air conditioner indoor unit according to the target superheat degree so as to reduce the refrigerating output of the air conditioner.
The control device for the electronic expansion valve of the air conditioner indoor unit provided by the embodiment of the invention can be used for continuously closing the electronic expansion valve by setting and improving the target superheat degree of the evaporator when the air conditioner has the tendency of temperature shutdown, so that the refrigerant flow is further reduced, the refrigerating output is controlled to be reduced, the air conditioner is enabled to work at relatively small refrigerating output, and frequent startup and shutdown are avoided.
Further, in an optional embodiment, the setting module is further configured to set the target superheat degree according to the following relation if the temperature-to-temperature shutdown temperature difference is smaller than the first preset adjustment temperature and larger than the second preset adjustment temperature:
T＝TA+K×(ΔTa-A)2，
wherein T represents the target superheat degree, TA represents a target superheat initial value of the evaporator cooling operation, K represents a proportionality coefficient, Δ TA represents the to-warm shutdown temperature difference, and a represents the first preset regulation temperature.
In a third aspect, the present invention provides an air conditioner, comprising a controller, wherein the controller is used for executing computer instructions to realize a control method of an electronic expansion valve of an air conditioner internal unit. Wherein the control method comprises the following steps:
acquiring the ambient temperature of an indoor unit of the air conditioner and the set temperature of the air conditioner during the refrigerating operation of the air conditioner;
calculating the difference value between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference value;
if the difference value of the temperature-reaching shutdown temperature is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature, improving the target superheat degree of an evaporator of the air conditioner indoor unit, wherein the first preset adjusting temperature represents that the air conditioner has a critical temperature of the temperature-reaching shutdown trend;
and carrying out fuzzy control on an electronic expansion valve of the air conditioner indoor unit according to the target superheat degree so as to reduce the refrigerating output of the air conditioner.
The air conditioner provided by the embodiment of the invention can be used for continuously closing the electronic expansion valve by setting and improving the target superheat degree of the evaporator when the air conditioner is in a warm shutdown trend, and further reducing the flow of the refrigerant, so that the output of the refrigerating capacity is controlled to be reduced, the air conditioner can work at a relatively small refrigerating capacity, and frequent startup and shutdown are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air conditioner indoor unit in fig. 1;
fig. 3 is a schematic view of a connection structure of a controller of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method of an electronic expansion valve of an air conditioner internal unit according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating the sub-steps of step S200 in FIG. 4;
FIG. 6 is a graph illustrating the mathematical model established between T and Δ Ta in step S600 of FIG. 4;
fig. 7 is a block diagram schematically illustrating a structure of a control device for an electronic expansion valve of an air conditioner indoor unit according to an embodiment of the present invention.
Icon:
1-an air conditioner;
10-an outdoor unit;
20-an air conditioner indoor unit; 201-an evaporator; 202-a fan; 203-electronic expansion valve; 204-evaporator inlet temperature sensor; 205-evaporator outlet temperature sensor; 206-ambient temperature sensor; 207-a controller;
30-control device of electronic expansion valve of air conditioner indoor unit; 301-a control module; 302-an acquisition module; 303-a calculation module; 304-a judgment module; 305-setting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In the related technology, the opening degree of the electronic expansion valve is controlled by superheat degree, so that the refrigerant at the outlet of the evaporator has a certain superheat degree, the suction gas of the compressor is ensured not to carry liquid, and the working safety of the compressor is ensured. However, in the research, the designer of the application finds that the control idea of the electronic expansion valve in the related art is mostly considered from the reliability, and lacks the consideration of cold quantity adjustment, so that the problem that the air conditioner is prone to frequent warm-up shutdown when the refrigeration of the air conditioner is close to warm-up shutdown (namely the ambient temperature is close to the set temperature) is difficult to solve, and the user experience is influenced. For the air conditioning system with one unit driving one air conditioner, the mode of reducing the frequency of the compressor can be adopted to reduce the cold output. However, the multi-split air conditioner needs to comprehensively consider the load conditions of different rooms, and cannot meet the special conditions of individual rooms. If most rooms are relatively high in load and high in cold quantity demand, the individual rooms are close to the warm shutdown, the cold quantity demand is low, the compressor still needs high-frequency output at the moment, and the small rooms are easy to enter the warm shutdown and are frequently started and stopped. Therefore, the air conditioner in the related art has the problems that the cooling capacity is difficult to control, and the air conditioner is easy to have frequent warm-up shutdown.
In order to improve the technical problem, the invention provides a control method and a control device for an electronic expansion valve of an air conditioner indoor unit and the air conditioner, which are used for controlling the refrigerating capacity of the air conditioner and can effectively avoid frequent startup and shutdown of the air conditioner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a control method and a control device of an electronic expansion valve of an air conditioner indoor unit, which are applied to an air conditioner 1. The air conditioner 1 may be a unit-by-unit air conditioning system or a multi-split air conditioning system. In the present embodiment, the air conditioner 1 is specifically described as a multi-split air conditioner.
Referring to fig. 1 and 2, the air conditioner 1 includes an outdoor unit 10 and a plurality of air conditioner indoor units 20 connected to the outdoor unit 10. Each air conditioner internal unit 20 includes an evaporator 201, a fan 202, an electronic expansion valve 203, an evaporator inlet temperature sensor 204, an evaporator outlet temperature sensor 205, and an ambient temperature sensor 206. The electronic expansion valve 203 is connected to the outdoor unit 10 and the inlet of the evaporator 201, and the outlet of the evaporator 201 is connected to the outdoor unit 10. The blower 202 is used to blow air to the evaporator 201 so that the air heat-exchanged by the evaporator 201 is blown into the room. An evaporator inlet temperature sensor 204 is provided at the inlet of the evaporator 201 for detecting an evaporator inlet temperature, denoted Tei. An evaporator outlet temperature sensor 205 is provided at the outlet of the evaporator 201 for detecting an evaporator outlet temperature, which is denoted Teo. The ambient temperature sensor 206 is disposed at the air inlet, and obtains the ambient temperature of the air conditioner indoor unit 20 by detecting the return air temperature, where the ambient temperature is represented by Ta.
Referring to fig. 3, the air conditioner 1 further includes a controller 207, and the controller 207 is electrically connected to the evaporator inlet temperature sensor 204, the evaporator outlet temperature sensor 205, the ambient temperature sensor 206, and the electronic expansion valve 203, respectively. The controller 207 is configured to receive an evaporator inlet temperature detected by the evaporator inlet temperature sensor 204, an evaporator outlet temperature detected by the evaporator outlet temperature sensor 205, and an ambient temperature detected by the ambient temperature sensor 206. And the controller 207 is also used for calculating the real-time superheat degree of the evaporator 201 according to the evaporator inlet temperature and the evaporator outlet temperature. The real-time superheat of the evaporator 201 is denoted by Δ Te. In this embodiment, the real-time superheat is evaporator outlet temperature — evaporator inlet temperature, that is, Δ Te is Teo-Tei. The controller 207 is further configured to calculate a temperature-to-shutdown temperature difference according to the ambient temperature and the set temperature of the air conditioner 1, where the set temperature of the air conditioner 1 is represented by Ts and the temperature-to-shutdown temperature difference is represented by Δ Ta. It should be noted that the set temperature is a heat exchange target temperature set by a user through a remote controller or a control panel, and the difference value between the temperature to the warm shutdown temperature is used to represent the degree of the air conditioner 1 approaching to the warm shutdown. In the present embodiment, the temperature difference to warm-stop is equal to the ambient temperature — the set temperature, that is, Δ Ta is equal to Ta — Ts. In addition, the controller 207 is also configured to set a target superheat degree of the evaporator 201, which is denoted by T, and to control the opening degree of the electronic expansion valve 203 by Δ Te → T during cooling operation of the air conditioner 1, that is, to control the opening degree of the electronic expansion valve 203 such that the real-time superheat degree Δ Te reaches the target superheat degree T. The controller 207 is further configured to obtain a target superheat initial value of the refrigeration operation of the evaporator 201, where the target superheat initial value represents a target superheat degree of the evaporator 201 in the initial state of the refrigeration operation after responding to the refrigeration operation instruction of the user. The target superheat initial value is denoted TA, which may alternatively be preset at 2-4 ℃.
The controller 207 may be an integrated circuit chip having signal processing capabilities. The controller 207 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller 207 may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible implementation manner, the air conditioner 1 may further include a memory for storing program instructions executable by the controller 207, for example, the control device 30 of the electronic expansion valve of the air conditioner internal unit provided in the embodiment of the present application includes at least one of the program instructions stored in the memory in the form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller 207, for example, the memory may be integrated with the controller 207 on the same chip.
Referring to fig. 4, based on the air conditioner 1, a method for controlling an electronic expansion valve of an air conditioner internal unit according to an embodiment of the present invention is described in detail below. The control method of the electronic expansion valve of the air conditioner indoor unit provided by the embodiment of the invention can comprise the following steps:
and step S100, responding to the refrigerating operation instruction of the user to control the air conditioner 1 to perform refrigerating operation.
In step S200, fuzzy control is performed on the electronic expansion valve 203 of the air conditioner indoor unit 20 according to the target superheat degree of the evaporator 201 of the air conditioner indoor unit 20.
In step S200, the electronic expansion valve 203 performs fuzzy control in accordance with the real-time superheat Δ Te → T of the evaporator 201, and controls the opening degree of the electronic expansion valve 203 so that the real-time superheat Δ Te reaches the target superheat T. In the initial state of the cooling operation of the air conditioner 1, the controller 207 sets a target superheat initial value as a target superheat degree, that is, T is TA. At this time, the electronic expansion valve 203 is fuzzy-controlled with the target superheat initial value as the target superheat degree. It should be noted that, when the air conditioner normally performs conventional refrigeration, in order to maximize the heat exchange capacity of the evaporator 201 and the refrigerant, ensure the output of the refrigeration capacity, and ensure the suction safety of the compressor, the TA may be selected to be 2 to 4 ℃ according to an empirical value, and further may be selected to be 3 ℃ in this embodiment.
Referring to fig. 5, in the present embodiment, step S200 may include the following sub-steps S210-S240:
in substep S210, the real-time superheat of the evaporator 201 is acquired.
In sub-step S210, the evaporator inlet temperature Tei detected by the evaporator inlet temperature sensor 204 is obtained, and the evaporator outlet temperature Teo detected by the evaporator outlet temperature sensor 205 is obtained. The real-time superheat of the evaporator 201 is calculated from the evaporator inlet temperature and the evaporator outlet temperature. In this embodiment, the real-time superheat degree Δ Te is equal to the evaporator outlet temperature Teo — the evaporator inlet temperature Tei, that is, Δ Te is equal to Teo-Tei.
In the substep S220, if the real-time superheat is greater than the sum of the target superheat and the preset superheat, the opening degree of the electronic expansion valve 203 is controlled to be increased.
In the sub-step S220, a first preset superheat degree is indicated by T1 and is set accordingly according to actual needs. That is, it is determined whether Δ Te > T + T1 is satisfied. In this embodiment, T1 may be selected as 1 ℃, i.e., whether Δ Te > T +1 is satisfied. When Δ Te > T + T1, the opening degree of the electronic expansion valve 203 is controlled to increase the refrigerant flow rate.
In the substep S230, if the real-time superheat is less than the target superheat minus a second preset superheat, the opening degree of the electronic expansion valve 203 is controlled to decrease.
In the substep S230, a second preset superheat degree is represented by T2, and is set correspondingly according to actual needs, and the second preset superheat degree and the first preset superheat degree may have the same value or different values. That is, it is determined whether Δ Te < T-T2 is satisfied. In this embodiment, T2 may be selected as 1 deg.C, i.e., whether Δ Te < T-1 is satisfied. When the delta Te is less than T-T2, the opening degree of the electronic expansion valve 203 is controlled to be reduced so as to reduce the flow rate of the refrigerant.
In the substep S240, if the real-time superheat is greater than or equal to the difference between the target superheat and the second preset superheat and is less than or equal to the sum of the target superheat and the first preset superheat, the electronic expansion valve 203 is controlled to maintain the current opening degree.
In sub-step S240, when T-T2 ≦ Δ Te ≦ T + T1, it may be assumed that the real-time superheat degree is within the appropriate range around the target superheat degree, and the electronic expansion valve 203 is controlled to maintain the current opening degree.
It should be noted that, in the above substeps S220-S240, the specific speed of the electronic expansion valve 203 may be adjusted and verified by experiments according to the difference between the current real-time superheat degree Δ Te and the target superheat degree T, and the difference between the current real-time superheat degree Δ Te and the last real-time superheat degree Δ Te.
Referring to fig. 4, in step S300, the ambient temperature of the air conditioner 20 and the set temperature of the air conditioner 1 during the cooling operation are obtained.
In step S300, the ambient temperature of the air conditioner indoor unit 20 is detected in real time by the ambient temperature sensor 206.
And step S400, calculating the difference between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference.
In step S400, the warm-up shutdown temperature difference is calculated according to the following relationship: Δ Ta — Ts. The warm-up shutdown temperature difference may be indicative of the extent to which the air conditioner 1 is approaching a warm-up shutdown.
Step S500, judging whether the temperature shutdown temperature difference is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature.
In step S500, a first preset adjustment temperature is represented by a, and a second preset adjustment temperature is represented by a, i.e., it is determined whether a < Δ Ta < a is satisfied. In actual operation, when the difference between the ambient temperature and the set temperature is 5 ℃, the refrigeration requirement is small, and the air conditioner 1 has a trend of warm shutdown, so that optionally the first preset adjusting temperature a is 5 ℃. In addition, the second preset regulation temperature a represents a critical temperature at which the air conditioner 1 has reached a warm stop. Optionally, in this embodiment, the second preset adjustment temperature a is-1 ℃ according to actual needs. Then, it is judged whether-1 < Δ Ta < A is satisfied.
In step S600, if the temperature shutdown temperature difference is smaller than the first preset adjustment temperature and greater than the second preset adjustment temperature, the target superheat degree of the evaporator 201 of the indoor unit 20 of the air conditioner is increased.
In step S600, when a < Δ Ta < a is satisfied, it may be determined that the air conditioner 1 has a tendency to warm-stop, and at this time, the cooling output may be reduced by closing the electronic expansion valve 203 to reduce the refrigerant flow rate, and in the control manner, the opening degree of the electronic expansion valve 203 may be controlled to be reduced by setting the target superheat degree to reduce the cooling output of the air conditioner 1. After step S600, step S200 is executed, that is, the electronic expansion valve 203 is fuzzy-controlled according to the target superheat degree after the increase, at this time, since the target superheat degree is increased, Δ Te < T-T2 may be satisfied, and therefore, the opening degree of the electronic expansion valve 203 is controlled to be decreased to decrease the refrigerant flow rate. It should be appreciated that after the opening degree of the electronic expansion valve 203 is decreased, steps S300-S500 are repeated, and if a < Δ Ta < a in step S600 is still satisfied, the target superheat degree is continued to be increased, thereby further decreasing the opening degree of the electronic expansion valve 203. Thus, according to the fuzzy control of the electronic expansion valve 203 and the judgment of the temperature difference value of the cycle to the warm shutdown, the electronic expansion valve 203 is continuously closed, the refrigerant flow is further reduced, the output of the refrigerating capacity is controlled, the air conditioner 1 is maintained to work at a low cooling capacity in a stage with the trend of the warm shutdown, and the frequent startup and shutdown are avoided.
In addition, in step S600, if the temperature-to-shutdown temperature difference is smaller than the first preset adjustment temperature and larger than the second preset adjustment temperature, the target superheat degree increases as the temperature-to-shutdown temperature difference decreases, and the absolute value of the ratio of the target superheat degree to the temperature-to-shutdown temperature difference increases as the temperature-to-shutdown temperature difference decreases. That is, when a < Δ Ta < a is satisfied, if Δ Ta is decreased, it is considered that the cooling of the air conditioner 1 tends to be more toward the warm stop, and in order to ensure that the unit is kept operating, the target superheat degree can be increased more quickly at this time, and the cooling output is decreased more quickly, that is, Δ Ta is decreased, and the absolute value of the rate of change of the target superheat degree with the change in the temperature difference to the warm stop increases.
Referring to fig. 6, in the present embodiment, if the temperature shutdown temperature difference is smaller than the first preset adjustment temperature and larger than the second preset adjustment temperature, the target superheat degree is set according to the following relation:
T＝TA+K×(ΔTa-A)2。
wherein K represents a proportionality coefficient.
The smaller Δ Ta, the larger the rate of change of the target superheat. Optionally, a mathematical model between T and Δ Ta is established, i.e., an upward parabola. Where K × (Δ Ta-a)2 is a superheat correction term, and indicates a correction performed based on the target superheat initial value Ta.
In addition, TB: the target superheat degree when Δ Ta is 0, the ambient temperature reaches the set temperature, the theoretically required cooling capacity is 0, and the air conditioner 1 is required to output the minimum cooling capacity to keep the stable operation of the air conditioner without frequent startup and shutdown.
Referring to fig. 4, in step S700, if the temperature shutdown temperature difference is greater than or equal to the first preset adjustment temperature, the target superheat degree is set as the target superheat initial value of the refrigeration operation of the evaporator 201.
In step S700, when Δ Ta ≧ a is satisfied, it is assumed that the air conditioner 1 has not yet had a tendency to stop at the warm temperature, and at this time, the cooling demand of the air conditioner 1 is large, and the target superheat degree is set to the target superheat initial value for the cooling operation of the evaporator 201, that is, T ═ Ta. After step S700, step S200 is continued, that is, fuzzy control is performed on the electronic expansion valve 203 with the target superheat initial value as the target superheat degree, and steps S300 to S500 are repeated, and control is performed accordingly according to the result of the next determination.
In this embodiment, a target superheat function may be established in step S600 and step S700:
T＝TA，ΔTa≥A；
T＝TA+K×(ΔTa-A)2，a＜ΔTa＜A。
the values for a and K can be adjusted by mathematical modeling and experimental verification. In this embodiment, the air conditioner 1 needs a heat exchange temperature difference for cooling, and the evaporator inlet temperature is controlled to be higher than 0 ℃ to prevent the evaporator 201 from freezing, so that the real-time superheat degree of the evaporator 201 is equal to the evaporator outlet temperature — the evaporator inlet temperature < the evaporator outlet temperature < the outlet air temperature of the air conditioner 1 < the set temperature of the air conditioner 1. If the target superheat of the evaporator 201 is set too high, the real-time superheat cannot reach the target value, and the electronic expansion valve 203 is continuously closed to the minimum opening degree, which may result in insufficient capacity output, so the target superheat is set to the practically achievable range. The minimum refrigeration set temperature of the air conditioner is 16 ℃, and if T is less than 16, TB is 3+ K multiplied by 25 and less than 16. When TB is 10 ℃, 3+ Kx 25 is 10, and K is 0.28. Therefore, in this embodiment, the specific target superheat function is:
T＝3，ΔTa≥5；
T＝3+0.28×(ΔTa-5)2，-1＜ΔTa＜5。
it should be noted that, in this embodiment, each parameter value is an example for convenience of describing the technical solution, and is an experience recommended value, and may be set correspondingly according to needs and test effects in practical application.
Step S800, if the temperature shutdown temperature difference is less than or equal to the second preset adjustment temperature, controlling the compressor of the air conditioner 1 to shutdown and restoring the electronic expansion valve 203 to the initial opening degree, or controlling the electronic expansion valves 203 of the air conditioner internal units 20 to be all closed or all adjusted to the minimum opening degree.
In step S800, if Δ Ta ≦ a is satisfied, i.e., Δ Ta ≦ -1 in the present embodiment, it may be determined that the air conditioner 1 has been shutdown at warm temperature. At this time, for the unit-by-unit air conditioning system, the compressor of the air conditioner 1 is controlled to stop and the electronic expansion valve 203 is restored to the initial opening degree. For the multi-split air conditioner, the electronic expansion valves 203 of the air conditioner indoor units 20 are controlled to be all closed or all adjusted to the minimum opening degree.
It should be noted that, when the air conditioner resumes the cooling operation after the warm-up and shutdown, the steps S200 to S800 are continuously executed, and the above control is repeated.
According to the control method of the electronic expansion valve of the air conditioner indoor unit provided by the embodiment of the invention, under the condition that the difference value of the temperature-reaching shutdown temperature is smaller than the first preset regulation temperature and larger than the second preset regulation temperature, the air conditioner 1 can be considered to have the trend of temperature-reaching shutdown, the target superheat degree of the evaporator 201 is increased through setting, and the electronic expansion valve 203 is subjected to fuzzy control according to the increased target superheat degree, so that the electronic expansion valve 203 is continuously closed, the flow of a refrigerant is further reduced, the output of refrigerating capacity is controlled to be reduced, the air conditioner 1 is enabled to work at relatively small refrigerating capacity, and frequent startup and shutdown is avoided.
Referring to fig. 7, in order to execute possible steps of the control method of the electronic expansion valve of the air conditioner internal unit provided in the foregoing embodiments, an embodiment of the present invention provides a control device 30 of the electronic expansion valve of the air conditioner internal unit, which is applied to an air conditioner 1 and is used for executing the control method of the electronic expansion valve of the air conditioner internal unit. It should be noted that the basic principle and the generated technical effects of the control device 30 for an electronic expansion valve of an air conditioner indoor unit according to the embodiment of the present invention are substantially the same as those of the above embodiment, and for the sake of brief description, reference may be made to corresponding contents in the above embodiment for parts that are not mentioned in this embodiment.
The control device 30 for the electronic expansion valve of the indoor unit of the air conditioner can comprise a control module 301, an obtaining module 302, a calculating module 303, a judging module 304 and a setting module 305.
The control module 301 is configured to respond to a cooling operation instruction of a user to control the air conditioner 1 to perform cooling operation.
Optionally, the control module 301 may be specifically configured to execute step S100 in the control method described above, so as to achieve the corresponding technical effect.
The control module 301 is further configured to perform fuzzy control on the electronic expansion valve 203 of the air conditioner indoor unit 20 according to the target superheat degree of the evaporator 201 of the air conditioner indoor unit 20.
Optionally, the control module 301 may be specifically configured to execute the step S200 and each sub-step thereof in the control method described above, so as to achieve the corresponding technical effect.
The obtaining module 302 is configured to obtain an ambient temperature of the air conditioner internal unit 20 when the air conditioner 1 is in the cooling operation and a set temperature of the air conditioner 1.
Optionally, the obtaining module 302 may be specifically configured to execute step S300 in the control method, so as to achieve a corresponding technical effect.
And the calculating module 303 is configured to calculate a difference between the ambient temperature and the set temperature to obtain a temperature shutdown temperature difference.
Optionally, the calculating module 303 may be specifically configured to execute step S400 in the above control method, so as to achieve the corresponding technical effect.
The determining module 304 is configured to determine whether the temperature shutdown temperature difference is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature.
Optionally, the determining module 304 may be specifically configured to execute step S500 in the control method described above, so as to achieve the corresponding technical effect.
The setting module 305 is configured to increase the target superheat degree of the evaporator 201 of the indoor unit 20 of the air conditioner if the temperature-to-temperature shutdown temperature difference is smaller than the first preset adjustment temperature and larger than the second preset adjustment temperature.
Optionally, the setting module 305 may be specifically configured to execute step S600 in the control method described above, so as to achieve the corresponding technical effect.
The setting module 305 is further configured to set the target superheat degree to a target superheat initial value of the refrigeration operation of the evaporator 201 if the temperature-to-temperature shutdown temperature difference is greater than or equal to the first preset adjustment temperature.
Optionally, the setting module 305 may be specifically configured to execute step S700 in the control method described above, so as to achieve the corresponding technical effect.
The control module 301 is further configured to control the compressor of the air conditioner 1 to stop and restore the electronic expansion valve 203 to the initial opening degree if the temperature stop temperature difference is less than or equal to the second preset adjustment temperature, or control the electronic expansion valves 203 of the air conditioner internal units 20 to be all closed or all adjusted to the minimum opening degree.
Optionally, the control module 301 may be specifically configured to execute step S800 in the control method described above, so as to achieve a corresponding technical effect.
In summary, according to the control method and device for the electronic expansion valve of the air conditioner indoor unit and the air conditioner 1 provided by the embodiment of the present invention, when the air conditioner 1 has a tendency of shutdown at a warm temperature, the target superheat degree of the evaporator 201 is set to be increased, and the electronic expansion valve 203 is subjected to fuzzy control according to the increased target superheat degree, so that the electronic expansion valve 203 is continuously turned off, the refrigerant flow is further reduced, the output of the cooling capacity is further reduced, the air conditioner 1 is controlled to work at a relatively small cooling capacity, and frequent shutdown is avoided.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A control method for an electronic expansion valve of an air conditioner indoor unit is applied to an air conditioner (1), and is characterized by comprising the following steps:
acquiring the ambient temperature of an air conditioner indoor unit (20) and the set temperature of the air conditioner (1) when the air conditioner (1) operates in a refrigerating mode;
calculating the difference value between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference value;
if the difference value of the temperature-reaching shutdown temperature is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature, the target superheat degree of an evaporator (201) of the air conditioner indoor unit (20) is increased, wherein the first preset adjusting temperature represents that the air conditioner (1) has a critical temperature of the temperature-reaching shutdown trend;
and carrying out fuzzy control on an electronic expansion valve (203) of the air conditioner indoor unit (20) according to the target superheat degree so as to reduce the refrigerating output of the air conditioner (1).
2. The control method of the electronic expansion valve of the air conditioner indoor unit as claimed in claim 1, wherein in the step of increasing the target superheat degree of the evaporator (201) of the air conditioner indoor unit (20) if the temperature-to-temperature shutdown temperature difference is less than a first preset regulation temperature and greater than a second preset regulation temperature:
if the difference value of the temperature-reaching shutdown temperature is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, the target superheat degree is increased along with the decrease of the difference value of the temperature-reaching shutdown temperature, and the absolute value of the ratio of the target superheat degree to the difference value of the temperature-reaching shutdown temperature is increased along with the decrease of the difference value of the temperature-reaching shutdown temperature.
3. The control method for the electronic expansion valve of an air conditioner indoor unit as claimed in claim 2, wherein the step of increasing the target superheat degree of the evaporator (201) of the air conditioner indoor unit (20) if the temperature-to-temperature shutdown temperature difference is less than a first preset regulation temperature and greater than a second preset regulation temperature comprises:
if the difference value of the temperature-reaching shutdown temperature is smaller than the first preset adjusting temperature and larger than the second preset adjusting temperature, setting the target superheat degree according to the following relational expression:
T＝TA+K×(ΔTa-A)2，
wherein T represents the target superheat degree, TA represents a target superheat initial value of the refrigerating operation of the evaporator (201), K represents a proportionality coefficient, Δ Ta represents the temperature difference to the warm-stop, and A represents the first preset regulation temperature.
4. The control method of an electronic expansion valve of an indoor unit of an air conditioner according to claim 1, further comprising:
and if the difference value of the temperature-reaching shutdown temperature is greater than or equal to the first preset adjusting temperature, setting the target superheat degree as a target superheat initial value of the refrigeration operation of the evaporator (201).
5. The control method of an electronic expansion valve of an indoor unit of an air conditioner according to claim 1, further comprising:
and if the difference value of the temperature-reaching shutdown temperature is less than or equal to the second preset adjusting temperature, controlling the compressor of the air conditioner (1) to shutdown and enabling the electronic expansion valve (203) to recover to the initial opening degree.
6. The control method of an electronic expansion valve of an indoor unit of an air conditioner according to claim 1, further comprising:
and if the difference value of the temperature-reaching shutdown temperatures is less than or equal to the second preset adjusting temperature, controlling electronic expansion valves (203) of the air conditioner internal units (20) to be closed or adjusted to the minimum opening degree.
7. The control method of the electronic expansion valve of the air conditioner indoor unit according to any one of claims 1-6, wherein the step of fuzzy controlling the electronic expansion valve (203) of the air conditioner indoor unit (20) according to the target superheat degree comprises the following steps:
acquiring the real-time superheat degree of the evaporator (201);
if the real-time superheat degree is larger than the sum of the target superheat degree and a first preset superheat degree, controlling the opening degree of the electronic expansion valve (203) to increase;
if the real-time superheat degree is smaller than the difference value of the target superheat degree minus a second preset superheat degree, controlling the opening degree of the electronic expansion valve (203) to be reduced;
and if the real-time superheat degree is larger than or equal to the difference value of the target superheat degree minus the second preset superheat degree and smaller than or equal to the sum of the target superheat degree plus the first preset superheat degree, controlling the electronic expansion valve (203) to keep the current opening degree.
8. A control device of an electronic expansion valve of an air conditioner indoor unit is applied to an air conditioner (1), and is characterized by comprising:
the acquisition module (302) is used for acquiring the ambient temperature of an air conditioner indoor unit (20) and the set temperature of the air conditioner (1) when the air conditioner (1) operates in a refrigerating mode;
the calculating module (303) is used for calculating the difference value between the environment temperature and the set temperature to obtain a temperature shutdown temperature difference value;
a setting module (305) for increasing a target superheat degree of an evaporator (201) of the air conditioner indoor unit (20) if the temperature-to-temperature shutdown temperature difference is smaller than a first preset adjusting temperature and larger than a second preset adjusting temperature;
and the control module (301) is used for carrying out fuzzy control on an electronic expansion valve (203) of the air conditioner indoor unit (20) according to the target superheat degree so as to reduce the refrigerating output of the air conditioner (1).
9. The control device for an electronic expansion valve of an indoor unit of an air conditioner as claimed in claim 8, wherein the setting module (305) is further configured to set the target superheat degree in the following relationship if the difference between the temperature-to-temperature shutdown temperature and the temperature is less than the first preset regulation temperature and greater than the second preset regulation temperature:
T＝TA+K×(ΔTa-A)2，
wherein T represents the target superheat degree, TA represents a target superheat initial value of the refrigerating operation of the evaporator (201), K represents a proportionality coefficient, Δ Ta represents the temperature difference to the warm-stop, and A represents the first preset regulation temperature.
10. An air conditioner, characterized by comprising a controller (207), wherein the controller (207) is used for executing computer instructions to realize the control method of the electronic expansion valve (203) of the air conditioner indoor unit (20) according to any one of claims 1-7.
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