CN108375170B - Control method and device of electronic expansion valve and air conditioner - Google Patents
Control method and device of electronic expansion valve and air conditioner Download PDFInfo
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- CN108375170B CN108375170B CN201810145374.0A CN201810145374A CN108375170B CN 108375170 B CN108375170 B CN 108375170B CN 201810145374 A CN201810145374 A CN 201810145374A CN 108375170 B CN108375170 B CN 108375170B
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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
- F24F11/62—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
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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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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Abstract
A control method and device for an electronic expansion valve and an air conditioner relate to the technical field of air conditioners. According to the embodiment of the invention, under the condition that the running state of the refrigerant system is still in an unsteady state process after the air-conditioning compressor is started, the opening degree of the electronic expansion valve is adjusted according to the current outdoor environment temperature, so that the opening degree of the electronic expansion valve is more matched with the running state of the refrigerant system. The method comprises the following steps: determining the initial opening degree of the electronic expansion valve according to the starting parameters of the refrigerant system; controlling the electronic expansion valve to be in an initial opening degree after the compressor is started; and when the duration of the initial opening of the electronic expansion valve is greater than or equal to a time threshold, adjusting the opening of the electronic expansion valve according to the current outdoor environment temperature. The invention is applied to the refrigerant system of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an electronic expansion valve and an air conditioner.
Background
The electronic expansion valve is used as a throttling element which can control the flow of refrigerant in the refrigerant system according to a preset program. At present, more and more air conditioners use electronic expansion valves to control the flow rate of refrigerant in a refrigerant system. Compared with the traditional throttling device (such as a thermal expansion valve and the like), the electronic expansion valve has the characteristics of wider operation condition range, quicker adjustment reaction and the like, so that the product energy efficiency of the air conditioner can be improved by adopting the electronic expansion valve, and the air conditioner can obtain better operation effect in each operation state.
For example, fig. 1 is a schematic diagram of a refrigerant system of an air conditioner. The air conditioner refrigerant system mainly comprises four components: the heat exchanger comprises a compressor 11, an indoor heat exchanger 12, an electronic expansion valve 13 and an outdoor heat exchanger 14, wherein the compressor 11 is connected with the indoor heat exchanger 12 and the outdoor heat exchanger 14, the indoor heat exchanger 12 is connected with the outdoor heat exchanger 14 through the electronic expansion valve 13, and the four components are connected into a closed system to enable a refrigerant to circulate in the closed system and complete the processes of absorbing and releasing heat. Specifically, when the air conditioner is in a cooling state (as shown in the drawing, the direction indicated by the solid arrow indicates the flow direction of the refrigerant in the cooling state), the compressor 11 sucks and compresses the refrigerant from the indoor heat exchanger 12, and discharges the compressed refrigerant into the outdoor heat exchanger 14 to dissipate heat (in this case, the outdoor heat exchanger 14 is a condenser, and the refrigerant releases heat and condenses in the outdoor heat exchanger). After the refrigerant passes through the indoor heat exchanger 12 through the electronic expansion valve 13, the pressure in the indoor heat exchanger 12 is lower than the pressure in the outdoor heat exchanger 14 due to the throttling function of the electronic expansion valve 13, and the refrigerant absorbs heat in the indoor heat exchanger 12 (at this time, the indoor heat exchanger 12 is an evaporator, and the refrigerant absorbs heat and evaporates in the indoor heat exchanger 12), thereby completing the cycle process. When the air conditioner is in a heating state, the flow direction of the refrigerant is opposite to the direction in a cooling state (as shown in the figure, the direction indicated by the dotted arrow is the flow direction of the refrigerant in the cooling state), and the refrigerant is compressed by the compressor 11 and then releases heat and condenses in the indoor heat exchanger 12 (in this case, the indoor heat exchanger 12 is a condenser). Then, the refrigerant enters the outdoor heat exchanger 14, the pressure in the outdoor heat exchanger 14 is lower than the pressure in the indoor heat exchanger 12 due to the throttling action of the electronic expansion valve 13, and the refrigerant absorbs heat and evaporates in the outdoor heat exchanger 14 (at this time, the outdoor heat exchanger 14 is an evaporator), thereby completing the cycle process.
In addition, in order to enable the refrigerant in the refrigerant system of the air conditioner to complete the circulation process in different directions in the cooling and heating processes, as shown in fig. 2, the refrigerant system further includes a four-way valve 15. The four-way valve 15 is used to control the flow direction of the refrigerant. In order to avoid the presence of liquid refrigerant in the refrigerant sucked into the compressor 11, a gas-liquid separator 16 is provided at the inlet of the compressor.
Based on the structure and principle of the refrigerant system, in order to obtain a better working effect of the refrigerant system, the refrigerant flow in the refrigerant system is generally controlled by controlling the opening degree of the electronic expansion valve. When the electronic expansion valve is used to control the flow rate of the refrigerant in the refrigerant system, the opening degree of the electronic expansion valve is usually controlled by adopting a negative feedback mode, that is, the opening degree of the electronic expansion valve is controlled by collecting some operation states of the refrigerant system in the operation process of the air conditioner. However, when the air conditioner refrigerant system is started, various operating states (such as the exhaust superheat degree of the compressor, the exhaust temperature of the compressor, and the like) are in an unsteady state process, and at this time, if the opening degree of the electronic expansion valve is controlled by negative feedback, the opening degree of the electronic expansion valve may be large or small, which affects the service life of the electronic expansion valve, and causes the air conditioner to operate unstably and the load fluctuation to be large.
In order to solve the above technical problems, in the prior art, at the operation start stage of a refrigerant system of an air conditioner, it is a common practice to determine an appropriate initial opening according to start parameters of the refrigerant system (such as a start rotation speed of a compressor, a current outdoor ambient temperature, and the like), and then control an electronic expansion valve to maintain the initial opening for a predetermined time period until the state of the refrigerant system is stable.
However, the inventor of the present invention has found that the above method for controlling the electronic expansion valve during the start-up phase of the refrigerant system operation may cause the refrigerant cycle condition not to meet the practical requirement.
Disclosure of Invention
The invention provides a control method and a control device of an electronic expansion valve and an air conditioner, and optimizes a method for controlling the opening of the electronic expansion valve in the starting process of a refrigerant system of the air conditioner.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the present invention provides a control method for an electronic expansion valve, which is applied to a refrigerant system of an air conditioner, wherein the refrigerant system comprises a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger, an air suction port of the compressor is connected to the indoor heat exchanger, an air exhaust port of the compressor is connected to the outdoor heat exchanger, and the outdoor heat exchanger is connected to the indoor heat exchanger through the electronic expansion valve; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system. The method comprises the following steps: after the compressor is started, controlling the electronic expansion valve to be in an initial opening degree; and when the duration of the initial opening of the electronic expansion valve is greater than or equal to a time threshold, adjusting the opening of the electronic expansion valve according to the current outdoor environment temperature.
According to the control method of the electronic expansion valve provided by the embodiment of the invention, after the air conditioner compressor is started, under the condition that the running state of the refrigerant system is still in an unsteady state process, the initial opening degree of the electronic expansion valve is determined according to the starting parameters of the refrigerant system, and the electronic expansion valve is controlled to be in the initial opening degree. And then, after the electronic expansion valve is in the initial opening degree and is kept for a certain time, adjusting the opening degree of the electronic expansion valve according to the current outdoor environment temperature, so that the opening degree of the electronic expansion valve is more matched with the running state of a refrigerant system. Compared with the method that the electronic expansion valve only keeps a fixed initial opening degree in the starting process of the refrigerant system in the prior art, the control method of the electronic expansion valve provided by the invention can avoid the problem that the refrigerant flow provided by the electronic expansion valve under the initial opening degree can not meet the requirement of system circulation when the refrigerant system gradually transits to a steady state.
In a second aspect, an embodiment of the present invention provides a control device for an electronic expansion valve, which is applied to a refrigerant system of an air conditioner, where the refrigerant system includes a compressor, an outdoor heat exchanger, the electronic expansion valve, and an indoor heat exchanger, a suction port of the compressor is connected to the indoor heat exchanger, an exhaust port of the compressor is connected to the outdoor heat exchanger, and the outdoor heat exchanger is connected to the indoor heat exchanger through the electronic expansion valve; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system. The method comprises the following steps: the determining unit is used for determining the initial opening degree of the electronic expansion valve according to the starting parameters of the refrigerant system; the control unit is used for controlling the electronic expansion valve to be in an initial opening degree after the air conditioner compressor is started; and the control unit is also used for adjusting the opening of the electronic expansion valve according to the current outdoor environment temperature when the duration of the initial opening of the electronic expansion valve is greater than or equal to a time threshold.
In a third aspect, an embodiment of the present invention provides a control device for an electronic expansion valve, including: communication interface, processor, memory, bus. The memory is used for storing computer-executable instructions, the processor is connected with the memory through a bus, and when the control device of the electronic expansion valve operates, the processor executes the computer-executable instructions stored in the memory, so that the control device of the electronic expansion valve executes the control method of the electronic expansion valve provided by the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer storage medium comprising instructions that, when executed on a computer, cause the computer to perform a method of controlling an electronic expansion valve as provided in the first aspect above.
In a fifth aspect, an embodiment of the present invention provides an air conditioner, including the control device for an electronic expansion valve described in the second aspect to the fourth aspect.
In the above-mentioned solution, the technical problems that can be solved by the control device of the electronic expansion valve, the computer storage medium, and the air conditioner and the technical effects that can be achieved by the control device of the electronic expansion valve, the computer storage medium, and the air conditioner can refer to the technical problems and technical effects that are solved by the first aspect, so that the implementation of the control device of the electronic expansion valve, the computer storage medium, and the air conditioner can refer to the implementation of the method described in the first aspect, and repeated details are not repeated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a refrigerant system of an air conditioner;
FIG. 2 is a schematic diagram of a refrigerant system of an air conditioner;
fig. 3 is a schematic flow chart of a control method of an electronic expansion valve according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method for dividing temperature intervals according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a time-dependent variation process of the opening of the electronic expansion valve when the method provided by the embodiment of the present invention is used to control the opening of the electronic expansion valve;
fig. 6 is a schematic structural diagram of an air conditioner control device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an air conditioner control device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an air conditioner control device according to an embodiment of the present invention.
Detailed Description
Embodiments of the invention are described below with reference to the accompanying drawings:
first, the inventive principle of the present invention is explained:
at present, when the opening degree of the electronic expansion valve is controlled, because the state change of the refrigerant in the refrigerant system can be represented by a pressure-enthalpy diagram and other methods when the refrigerant system is in a stable working state, the opening degree of the electronic expansion valve can be controlled by the detected running states of the exhaust temperature of the compressor, the current frequency of the compressor and the like, and thus closed-loop control is realized. However, each operation state of the refrigerant system is in an unsteady state process such as when the air conditioner is just started, and therefore closed-loop control cannot be performed according to the operation state of the refrigerant system. Furthermore, in the prior art, an initial opening degree S of an electronic expansion valve is usually determined according to a starting parameter of a refrigerant system and maintained for a certain time, and then closed-loop control is performed according to an operation state of the refrigerant system after the refrigerant system enters a stable state.
Although the method in the prior art can also complete the starting of the refrigerant system to enable the refrigerant system to gradually enter a steady-state process, the demand for the circulation amount of the refrigerant in the refrigerant system changes along with the gradual transition of the system to the steady state, and at this time, if the flow rate of the refrigerant is controlled according to the initial opening degree all the time, the starting speed of the refrigerant system is influenced, and even equipment is damaged.
In order to solve the technical problems, the method provided by the invention adjusts the opening degree of the electronic expansion valve according to the current outdoor environment temperature after operating for a certain time according to the initial opening degree, so that the opening degree of the electronic expansion valve can be more matched with the current state of a refrigerant system, and the normal circulation of the refrigerant is ensured.
Based on the above principle, the embodiment of the invention provides a control method of an electronic expansion valve, which is applied to a refrigerant system of an air conditioner. The refrigerant system comprises a compressor, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger, wherein an air suction port of the compressor is connected with the indoor heat exchanger, an air exhaust port of the compressor is connected with the outdoor heat exchanger, and the outdoor heat exchanger is connected with the indoor heat exchanger through the electronic expansion valve; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system. The functions of the units in the refrigerant system of the present invention can be realized by referring to fig. 1 and 2 and the description of fig. 1 and 2 above.
As shown in fig. 3, a control method of an electronic expansion valve according to an embodiment of the present invention includes:
s101, determining the initial opening degree of the electronic expansion valve according to the starting parameters of the refrigerant system.
In one embodiment, the following may be expressed according to the formula:
S＝(Nti×K+B)×[1+(Ta-7)×Kt]
and calculating the initial opening degree of the electronic expansion valve.
Where Nti represents the compressor target speed, Ta represents the current outdoor ambient temperature, K, Kt is a coefficient, and B is a constant.
And S102, controlling the electronic expansion valve to be in an initial opening degree after the compressor is started.
By controlling the initial opening of the electronic expansion valve after the compressor is started, the proper suction pressure of the compressor can be maintained at the moment of starting the compressor and within a period of time after starting the compressor.
And S103, when the duration of the initial opening of the electronic expansion valve is greater than or equal to a time threshold, adjusting the opening of the electronic expansion valve according to the current outdoor environment temperature.
Specifically, after the compressor is started, the refrigerant system gradually transits to a steady state, and the refrigerant flow provided by the electronic expansion valve under the initial opening degree cannot meet the requirement of system circulation. When the duration time of the initial opening of the electronic expansion valve is greater than or equal to the time threshold, the opening of the electronic expansion valve is adjusted according to the current outdoor environment temperature, so that the opening of the electronic expansion valve is more matched with the running state of a refrigerant system.
For example, to achieve better effect, the time threshold may be 1 minute.
In one embodiment, the adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature specifically includes: and increasing the opening degree of the electronic expansion valve according to the current outdoor environment temperature.
In the embodiment of the invention, the problem that the evaporation capacity of the evaporator gradually enters the normal state along with the gradual steady-state transition of the refrigerant system after the refrigerant system is started is considered, and the refrigerant at the outlet of the evaporator is fully vaporized to reduce the pressure loss of the air suction of the compressor. Further, in a short time, there is a possibility of a low pressure or even a negative pressure at the suction port of the compressor. In addition, because the motor of the compressor needs refrigerant circulation for cooling, the temperature rise of the motor is faster when the refrigerant circulation amount is small or even no refrigerant is in existence; meanwhile, the exhaust circulation amount is small, the exhaust temperature detection is seriously delayed, and the motor coil can be degraded and even burnt. Therefore, the opening degree of the electronic expansion valve needs to be increased to ensure that the refrigerant circulation is normal. Furthermore, according to the method for increasing the opening degree of the electronic expansion valve according to the ambient temperature outside the current room, the opening degree of the electronic expansion valve can be more matched with the operation state of the refrigerant system.
Further, in an embodiment, considering that the lower the normal ambient temperature is, the smaller the initial opening degree of the electronic expansion valve is, the larger the opening degree of the electronic expansion valve needs to be increased when adjusting the opening degree of the electronic expansion valve. Therefore, the method specifically further comprises the following steps: and if the air conditioner works in a heating state, the opening degree of the electronic expansion valve is increased to be larger when the current outdoor environment temperature is lower.
Illustratively, the adjusting the opening degree of the electronic expansion valve according to the current outdoor environment temperature specifically includes:
the outdoor environment temperature is divided into N temperature intervals according to different temperature levels, and different temperature intervals correspond to different adjusting opening degrees. The adjusting opening degree refers to the opening degree increased by the electronic expansion valve, and the adjusting opening degree corresponding to a temperature interval with higher temperature is larger;
determining an adjustment opening corresponding to the current outdoor environment temperature;
and increasing the opening degree of the electronic expansion valve according to the opening degree adjusted corresponding to the current outdoor environment temperature.
For example, the opening degree of the electronic expansion valve is usually expressed by a letter b in units of "steps". Table 1 below shows the adjustment opening corresponding to different temperature ranges when the air conditioner is in a heating state. Wherein when
| Temperature interval | (-∞,-2℃] | (-2℃,5℃] | (5℃,14℃] | (14℃,∞) |
| Adjusting the opening degree | 0b | 40b | 80b | 150b |
TABLE 1
Further, in order to ensure the stability of the system when the opening degree of the electronic expansion valve is increased according to the current outdoor environment temperature, in an embodiment, the method further comprises: a transition interval is arranged between every two adjacent temperature intervals in the N temperature intervals;
determining an adjustment opening corresponding to the current outdoor environment temperature, specifically comprising: and when the current outdoor environment temperature is in the transition interval, acquiring the historical outdoor environment temperature of preset time before the current time, and taking the adjustment opening corresponding to the temperature interval where the historical outdoor environment temperature is located as the adjustment opening corresponding to the current outdoor environment temperature.
For example, as shown in fig. 4, if the outdoor ambient temperature is different according to the temperature, it is divided into a section a: the temperature range of the temperature-controlled reactor comprises (-2 ℃), a range B of [0 ℃,5 ℃, a range C of [7 ℃,14 ℃, and a range D of [16 ℃ and infinity), wherein a transition range is arranged between every two adjacent temperature ranges. At this time, if the current outdoor environment temperature is detected to be-1 ℃, determining the adjustment opening corresponding to the current outdoor environment temperature according to the historical outdoor environment temperature of the preset time before the current time. Further, if the previous historical outdoor environment temperature is-3 ℃, the corresponding adjustment opening degree of the current outdoor environment temperature can be determined to be 150 according to the corresponding relation of the table 1; if the previous historical outdoor environment temperature is 3 ℃, the adjustment opening corresponding to the current outdoor environment temperature can be determined to be 80 according to the corresponding relation of the table 1.
In one embodiment, after adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature, the method further comprises:
and S104a, when the state of the refrigerant in the refrigerant system meets the preset condition, adjusting the opening degree of the electronic expansion valve according to the current operation state of the refrigerant system.
The state of the refrigerant in the refrigerant system satisfies a preset condition, and specifically may include: the exhaust superheat degree in the refrigerant system is larger than or equal to a superheat degree threshold value.
The exhaust superheat degree refers to the temperature of the exhaust gas at the exhaust port of the compressor minus the saturation temperature of the refrigerant corresponding to the pressure in the condenser.
Illustratively, in order to achieve better effect, the threshold value of the superheat degree can be set between 8 and 15 ℃.
In the embodiment of the invention, whether the refrigerant system enters a stable state is determined by determining whether the state of the refrigerant meets the preset condition, so that the opening of the electronic expansion valve is adjusted according to the current running state of the refrigerant system after the refrigerant system is determined to enter the stable state. Compared with the method for determining whether the refrigerant system enters the stable state or not by calculating the running time of the refrigerant system under the initial opening degree in the prior art, the method provided by the embodiment of the invention has higher accuracy, thereby being beneficial to improving the efficiency of the air conditioner.
In one embodiment, in order to ensure the stability of the system when the opening degree of the electronic expansion valve is adjusted according to the current operating state of the refrigerant system, the adjusting of the opening degree of the electronic expansion valve according to the current operating state of the refrigerant system specifically includes:
determining a target opening degree of an electronic expansion valve corresponding to the current operation state of a refrigerant system;
determining a transitional opening degree according to the target opening degree, wherein: the transition opening degree is smaller than the current opening degree of the electronic expansion valve and larger than the target opening degree, or the transition opening degree is larger than the current opening degree of the electronic expansion valve and smaller than the target opening degree;
controlling the electronic expansion valve to be in a transition opening degree;
and when the duration of the transition opening degree of the electronic expansion valve is longer than or equal to the preset duration, controlling the electronic expansion valve to be in the target opening degree.
For example, fig. 5 shows a time-dependent change process of the opening degree of the electronic expansion valve when the method provided by the embodiment of the invention is used for controlling the opening degree of the electronic expansion valve. Wherein, the electronic expansion valve is controlled to be at the initial opening degree S0 after the compressor is started (i.e. the compressor is started at the time T0 shown in the figure); after the electronic expansion valve is at the initial opening degree for the full time threshold (for example, the time threshold in the figure is 1 minute, namely, the electronic expansion valve is at the initial opening degree for the full time threshold at the time of T1), determining an adjusting opening degree G value according to the outdoor environment temperature and adjusting the opening degree of the electronic expansion valve to S0+ G; subsequently, when it is detected that the degree of superheat DSH of the exhaust gas is greater than or equal to the degree of superheat threshold (the degree of superheat threshold is 15 ℃ in the figure), the transition from the open-loop control to the closed-loop control of the electronic expansion valve is completed through two adjustments (i.e., the opening degree is adjusted to the transitional opening degree S1 at time T2 first, and then the opening degree is adjusted to the target opening degree S2 at time T3).
In another embodiment, it is considered that in some special environments, the refrigerant system may enter a steady state although the state of the refrigerant does not satisfy the predetermined condition. Therefore, after adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature, the method may further include:
and S104b, when the state of the refrigerant in the refrigerant system meets a preset condition, or when the running time of the compressor reaches a preset time, adjusting the opening of the electronic expansion valve according to the current running state of the refrigerant system.
According to the control method of the electronic expansion valve provided by the embodiment of the invention, after the air conditioner compressor is started, under the condition that the running state of the refrigerant system is still in an unsteady state process, the initial opening degree of the electronic expansion valve is determined according to the starting parameters of the refrigerant system, and the electronic expansion valve is controlled to be in the initial opening degree. And then, after the electronic expansion valve is in the initial opening degree and is kept for a certain time, adjusting the opening degree of the electronic expansion valve according to the current outdoor environment temperature, so that the opening degree of the electronic expansion valve is more matched with the running state of a refrigerant system. Compared with the method that the electronic expansion valve only keeps a fixed initial opening degree in the starting process of the refrigerant system in the prior art, the control method of the electronic expansion valve provided by the invention can avoid the problem that the refrigerant flow provided by the electronic expansion valve under the initial opening degree can not meet the requirement of system circulation when the refrigerant system gradually transits to a steady state.
The embodiment of the invention provides a control device of an electronic expansion valve, which is applied to a refrigerant system of an air conditioner, wherein the refrigerant system comprises a compressor, an outdoor heat exchanger, the electronic expansion valve and an indoor heat exchanger; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system. The control device of the electronic expansion valve is used for executing the control method of the electronic expansion valve. The functional modules may be divided according to the above method examples, for example, the functional modules may be divided corresponding to the functions, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation. Fig. 6 is a schematic diagram of a possible structure of a control device for an electronic expansion valve according to an embodiment of the present invention, in a case where each function module is divided according to each function. Specifically, the control device 20 for an electronic expansion valve includes: a determination unit 201 and a control unit 202. Wherein:
a determining unit 201, configured to determine an initial opening degree of the electronic expansion valve according to a starting parameter of the refrigerant system;
the control unit 202 is used for controlling the electronic expansion valve to be in an initial opening degree after the air conditioner compressor is started;
the control unit 202 is further configured to adjust the opening degree of the electronic expansion valve according to the current outdoor environment temperature when the duration of the initial opening degree of the electronic expansion valve is greater than or equal to the time threshold.
In one embodiment, the adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature specifically includes:
and increasing the opening degree of the electronic expansion valve according to the current outdoor environment temperature.
If the air conditioner works in a heating state, the opening degree of the electronic expansion valve is increased to be larger as the current outdoor environment temperature is lower.
In an embodiment, the control unit 202 is further configured to, after adjusting the opening degree of the electronic expansion valve according to the current outdoor environment temperature, adjust the opening degree of the electronic expansion valve according to the current operating state of the refrigerant system when the state of the refrigerant in the refrigerant system satisfies a preset condition.
The state of the refrigerant in the refrigerant system meeting the preset conditions comprises the following steps: the exhaust superheat degree in the refrigerant system is larger than or equal to a superheat degree threshold value.
In one embodiment, adjusting the opening degree of the electronic expansion valve according to the current operation state of the refrigerant system specifically includes: determining a target opening degree of an electronic expansion valve corresponding to the current operation state of a refrigerant system; determining a transitional opening degree according to the target opening degree, wherein: the transition opening degree is smaller than the current opening degree of the electronic expansion valve and larger than the target opening degree, or the transition opening degree is larger than the current opening degree of the electronic expansion valve and smaller than the target opening degree; controlling the electronic expansion valve to be in a transition opening degree; and when the duration of the transition opening degree of the electronic expansion valve is longer than or equal to the preset duration, controlling the electronic expansion valve to be in the target opening degree.
It should be noted that, for other corresponding descriptions corresponding to each unit in the control device of the electronic expansion valve provided in the embodiment of the present invention, reference may be made to fig. 3 and the corresponding description of fig. 3 in the foregoing, and details are not repeated herein.
In the case of an integrated unit, fig. 7 shows a possible structural diagram of the control device of the electronic expansion valve described above. The control device 30 for an electronic expansion valve includes: a storage unit 301, a processing unit 302, and an interface unit 303. The processing unit 302 is configured to control and manage the operation of the control device of the electronic expansion valve, for example, the processing unit 302 is configured to support the control device of the electronic expansion valve to execute the processes S101 to S104a in fig. 3. A memory unit 301 for program codes and data of the control means of the electronic expansion valve. The interface unit 303 is used for connecting with other external devices and receiving input content, and for example, the interface unit may be connected with an air conditioning component such as an electronic expansion valve, a temperature sensor, and a compressor, so as to transmit a signal to the air conditioning component or receive a signal transmitted by the air conditioning component.
For example, the processing unit is a processor, the storage unit is a memory, and the interface unit is a transceiver. The control device of the electronic expansion valve is shown in fig. 8, and includes a transceiver 403, a processor 402, a memory 401, and a bus 404, where the transceiver 403 and the processor 402 are connected to the memory 401 through the bus 404.
The Memory 401 may be a Read-Only Memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an electrically erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.
The memory 401 is used for storing application program codes for executing the present invention, and is controlled by the processor 402. The transceiver 403 is used for receiving the content input by the external device, and the processor 402 is used for executing the application program code stored in the memory 401, so as to implement the control device of the electronic expansion valve described in the embodiment of the present invention.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the invention are all or partially effected when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
In addition, the embodiment of the invention also provides an air conditioner, which comprises the control device of the electronic expansion valve.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A control method of an electronic expansion valve is applied to a refrigerant system of an air conditioner, wherein the refrigerant system comprises a compressor, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger, an air suction port of the compressor is connected with the indoor heat exchanger, an air exhaust port of the compressor is connected with the outdoor heat exchanger, and the outdoor heat exchanger is connected with the indoor heat exchanger through the electronic expansion valve; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system; characterized in that the method comprises:
determining the initial opening degree of the electronic expansion valve according to the starting parameters of the refrigerant system;
controlling the electronic expansion valve to be in an initial opening degree after the compressor is started;
when the duration of the initial opening of the electronic expansion valve is greater than or equal to a time threshold, adjusting the opening of the electronic expansion valve according to the current outdoor environment temperature;
when the state of the refrigerant in the refrigerant system meets the preset condition, the opening degree of the electronic expansion valve is adjusted according to the current operation state of the refrigerant system, and the method specifically comprises the following steps:
determining a target opening degree of the electronic expansion valve corresponding to the current operation state of the refrigerant system;
determining a transitional opening degree according to the target opening degree, wherein: the transitional opening degree is smaller than the current opening degree of the electronic expansion valve and larger than the target opening degree, or the transitional opening degree is larger than the current opening degree of the electronic expansion valve and smaller than the target opening degree;
controlling the electronic expansion valve to be in the transition opening degree;
and when the duration of the electronic expansion valve in the transitional opening degree is greater than or equal to the preset duration, controlling the electronic expansion valve to be in the target opening degree.
2. The method according to claim 1, wherein the adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature specifically comprises:
and increasing the opening degree of the electronic expansion valve according to the current outdoor environment temperature.
3. The method of claim 2, wherein if the air conditioner is operated in a heating state, the opening degree of the electronic expansion valve is increased more as the current outdoor ambient temperature is lower.
4. The method of claim 1, wherein the state of the refrigerant in the refrigerant system satisfying a predetermined condition comprises: the exhaust superheat degree in the refrigerant system is larger than or equal to a superheat degree threshold value.
5. A control device of an electronic expansion valve is applied to a refrigerant system of an air conditioner, wherein the refrigerant system comprises a compressor, an outdoor heat exchanger, the electronic expansion valve and an indoor heat exchanger, an air suction port of the compressor is connected with the indoor heat exchanger, an air exhaust port of the compressor is connected with the outdoor heat exchanger, and the outdoor heat exchanger is connected with the indoor heat exchanger through the electronic expansion valve; the electronic expansion valve is used for throttling the refrigerant in the refrigerant system; characterized in that the control device comprises:
the determining unit is used for determining the initial opening degree of the electronic expansion valve according to the starting parameters of the refrigerant system;
the control unit is used for controlling the electronic expansion valve to be in an initial opening degree after the air conditioner compressor is started;
the control unit is further used for adjusting the opening degree of the electronic expansion valve according to the current outdoor environment temperature when the duration time of the initial opening degree of the electronic expansion valve is greater than or equal to a time threshold value;
the control unit is further configured to adjust the opening degree of the electronic expansion valve according to the current operating state of the refrigerant system when the state of the refrigerant in the refrigerant system meets a preset condition after the opening degree of the electronic expansion valve is adjusted according to the current outdoor environment temperature;
the adjusting the opening degree of the electronic expansion valve according to the current operation state of the refrigerant system specifically comprises:
determining a target opening degree of the electronic expansion valve corresponding to the current operation state of the refrigerant system;
determining a transitional opening degree according to the target opening degree, wherein: the transitional opening degree is smaller than the current opening degree of the electronic expansion valve and larger than the target opening degree, or the transitional opening degree is larger than the current opening degree of the electronic expansion valve and smaller than the target opening degree;
controlling the electronic expansion valve to be in the transition opening degree;
and when the duration of the electronic expansion valve in the transitional opening degree is greater than or equal to the preset duration, controlling the electronic expansion valve to be in the target opening degree.
6. The apparatus according to claim 5, wherein the adjusting the opening degree of the electronic expansion valve according to the current outdoor ambient temperature specifically comprises:
and increasing the opening degree of the electronic expansion valve according to the current outdoor environment temperature.
7. The apparatus of claim 6, wherein if the air conditioner is operated in a heating state, the opening degree of the electronic expansion valve is increased more as the current outdoor ambient temperature is lower.
8. The apparatus of claim 7, wherein the state of the refrigerant in the refrigerant system satisfying a predetermined condition comprises: the exhaust superheat degree in the refrigerant system is larger than or equal to a superheat degree threshold value.
9. An air conditioner characterized by comprising a control device of an electronic expansion valve according to any one of claims 5 to 8.
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| CN201810145374.0A CN108375170B (en) | 2018-02-12 | 2018-02-12 | Control method and device of electronic expansion valve and air conditioner |
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| CN108375170B true CN108375170B (en) | 2020-05-15 |
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| CN109883011B (en) * | 2018-12-24 | 2021-02-19 | 珠海格力电器股份有限公司 | Refrigerant adjusting method and device and air conditioning system |
| CN110186227B (en) * | 2019-05-31 | 2021-11-23 | 广东美的制冷设备有限公司 | Control method for electronic expansion valve of indoor unit of air conditioner |
| CN112050408B (en) * | 2019-06-05 | 2022-04-19 | 青岛海尔空调器有限总公司 | Heat storage control method of air conditioner |
| CN112050414B (en) * | 2019-06-05 | 2022-06-14 | 青岛海尔空调器有限总公司 | Heat storage control method of air conditioner |
| CN112050410B (en) * | 2019-06-05 | 2022-06-14 | 青岛海尔空调器有限总公司 | Heat storage control method of air conditioner |
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| CN112050403B (en) * | 2019-06-05 | 2022-04-19 | 青岛海尔空调器有限总公司 | Heat storage control method of air conditioner |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Applicant after: Hisense (Shandong) Air-conditioning Co., Ltd. Address before: 266736 Qingdao, Pingdu City, South Village, North Station, Hisense Road, No. 1, No. Applicant before: Hisense (Shandong) Air-conditioning Co., Ltd. |
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