CN114738939B - Method and device for controlling outdoor unit, outdoor unit and storage medium - Google Patents
Method and device for controlling outdoor unit, outdoor unit and storage medium Download PDFInfo
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- CN114738939B CN114738939B CN202210211823.3A CN202210211823A CN114738939B CN 114738939 B CN114738939 B CN 114738939B CN 202210211823 A CN202210211823 A CN 202210211823A CN 114738939 B CN114738939 B CN 114738939B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012937 correction Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims 2
- 238000005057 refrigeration Methods 0.000 abstract description 8
- 230000006870 function Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
-
- 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
- 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
- F24F11/70—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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of refrigeration, and discloses a method for controlling an outdoor unit, wherein the outdoor unit is provided with a compressor, and the method comprises the following steps: determining the state of an indoor unit; under the condition that the indoor units are in different states, different target operation schemes of the outdoor unit are determined according to dry contact signals between the indoor units and the outdoor unit or according to the suction pressure and the current operation frequency of the compressor; and controlling the outdoor unit to operate according to the target operation scheme. Determining a target operating scheme of the outdoor unit based on the dry contact signal or the suction pressure and the current operating frequency of the compressor can reduce the problem of erroneous stop caused by controlling the outdoor unit to stop only when the suction pressure value is less than a fixed value. The application also discloses a device for controlling the outdoor unit, the outdoor unit and a storage medium.
Description
Technical Field
The present application relates to the field of refrigeration technology, for example, to a method and apparatus for controlling an outdoor unit, and a storage medium.
Background
The refrigeration equipment is widely applied to the fields of refrigeration, refrigeration and the like. The refrigeration equipment comprises an indoor unit and an outdoor unit. The outdoor unit is used for cooling the indoor unit and reducing the temperature of the target environment.
The outdoor units in the market are mostly fixed-frequency units. The existing control method for the refrigerating and freezing machine set comprises the following steps: detecting the current suction pressure of the compressor; comparing the current suction pressure with a predetermined minimum shutdown pressure value; when the current suction pressure is less than or equal to a predetermined minimum shutdown pressure value, the compressor is shut down and a pressure shutdown memory is generated.
When the shutdown logic is adopted, if a plurality of thermal loads are reduced, error shutdown is particularly easy to be caused, and the temperature of the rest loads is not finished.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method, a device, an outdoor unit and a storage medium for controlling the outdoor unit, so as to reduce the occurrence of the problem of error shutdown of the outdoor unit.
In some embodiments, the outdoor unit has a compressor, the method comprising: determining the state of an indoor unit; under the condition that the indoor units are in different states, different target operation schemes of the outdoor unit are determined according to dry contact signals between the indoor units and the outdoor unit or according to the suction pressure and the current operation frequency of the compressor; and controlling the outdoor unit to operate according to the target operation scheme.
In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to perform the aforementioned method for controlling an outdoor unit when the program instructions are executed.
In some embodiments, the outdoor unit includes: the device for controlling the outdoor unit.
In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling an outdoor unit.
The method, the device, the outdoor unit and the storage medium for controlling the outdoor unit provided by the embodiment of the disclosure can realize the following technical effects:
first, the state of the indoor unit is determined. Different states correspond to different target operating schemes of the outdoor unit. A target operating scheme may be determined based on a dry contact signal between the indoor unit and the outdoor unit. The dry contact signal state is kept synchronous with the indoor unit switch state. Thus, the target operation scheme of the outdoor unit is determined based on the dry contact signal, and the problem of error shutdown can be reduced. Another target operating scheme may be determined based on the suction pressure of the compressor and the current operating frequency. Thus, the target operation scheme of the outdoor unit is determined by combining the suction pressure and the current operation frequency, and the problem of error shutdown caused by controlling the outdoor unit to be shut down only when the suction pressure value is smaller than a fixed value can be reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
fig. 1 is a schematic view of a method for controlling an outdoor unit according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of one application of an embodiment of the present disclosure;
FIG. 3 is another application schematic of an embodiment of the present disclosure;
FIG. 4 is another application schematic of an embodiment of the present disclosure;
fig. 5 is a schematic view of an apparatus for controlling an outdoor unit according to an embodiment of the present disclosure;
fig. 6 is a schematic view of another apparatus for controlling an outdoor unit provided in an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
As shown in conjunction with fig. 1, an embodiment of the present disclosure provides a method for controlling an outdoor unit, including:
s101, the processor determines the state of the indoor unit, wherein the state of the indoor unit comprises: the number of the indoor units and the switching state of the indoor units.
S102, under the condition that the indoor unit is in different states, the processor determines different target operation schemes of the outdoor unit according to dry contact signals between the indoor unit and the outdoor unit or according to suction pressure and current operation frequency of the compressor.
S103, the processor controls the outdoor unit to operate according to a target operation scheme.
First, the state of the indoor unit is determined. The states of the indoor units include the number of the indoor units and the switching states of the indoor units. The number of the indoor units is one or more. The outdoor unit is one. Different numbers of indoor units, starting-up states or shutdown states correspond to different target operation schemes of the outdoor unit. And when the indoor unit is in different states, the target operation scheme of the outdoor unit is determined according to the dry contact signal under the condition that the indoor unit and the outdoor unit can be connected and the dry contact signal is already connected. And under the condition that the indoor unit and the outdoor unit are not connected with dry contact signals, determining a target operation scheme of the outdoor unit according to the suction pressure of the compressor and the current operation frequency of the compressor. And then, controlling the outdoor unit to execute the determined target operation scheme.
In the embodiment of the present disclosure, the state of the indoor unit is first determined. Different states correspond to different target operating schemes of the outdoor unit. A target operating scheme may be determined based on a dry contact signal between the indoor unit and the outdoor unit. The dry contact signal state is kept synchronous with the indoor unit switch state. Thus, the target operation scheme of the outdoor unit is determined based on the dry contact signal, and the problem of error shutdown can be reduced. Another target operating scheme may be determined based on the suction pressure of the compressor and the current operating frequency. Thus, the target operation scheme of the outdoor unit is determined by combining the suction pressure and the current operation frequency of the compressor, and the problem of error shutdown caused by controlling the outdoor unit to be shut down only when the suction pressure value is smaller than a fixed value can be reduced.
Optionally, S102, the processor determines different target operating schemes of the outdoor unit according to different states of the indoor unit, including:
and under the condition that the number of the indoor units is 1, the processor determines a target operation scheme of the outdoor unit according to the dry contact signals between the indoor units and the outdoor unit.
And under the condition that a plurality of indoor units exist and the indoor units are started, the processor determines a target operation scheme of the outdoor unit according to the suction pressure and the current operation frequency of the compressor.
The indoor unit and the outdoor unit are connected through an air pipe and a liquid pipe. The liquid refrigerant starts from the outdoor unit, passes through the liquid pipe and then enters the indoor unit. The electromagnetic valve is arranged on the liquid pipe and is close to the indoor unit. The indoor unit is provided with a temperature controller. When the temperature of the thermal load increases to a first temperature threshold, the thermal load requires refrigeration. At this time, the temperature controller controls the indoor unit to start. The solenoid valve is closed. The dry contact signal is on. When the temperature of the thermal load drops to the second temperature threshold, the thermal load does not require refrigeration. At this time, the temperature controller controls the indoor unit to be turned off. The solenoid valve is opened. The dry contact signal is open.
When the number of the indoor units is 1, the indoor units are in one-to-one correspondence with the outdoor units. If the suction pressure is smaller than the fixed value as the judging condition of the shutdown of the outdoor unit, the problem that the heat load is reduced to the second temperature threshold value, but the suction pressure is still larger than the fixed value, so that the outdoor unit is not shutdown can occur. Thus, the outdoor unit is delayed to stop, energy is wasted, and the heat load temperature is reduced too much. And further, the compressor life is lost due to the long-time operation of the outdoor unit. In this scheme, the on-off state of the indoor unit is kept synchronous with the on-off state of the outdoor unit. And determining a target operation scheme of the outdoor unit according to the on-off condition of the dry contact signals between the indoor unit and the outdoor unit. And transmitting the indoor unit start-stop signal to the outdoor unit through the dry contact. The outdoor unit operates according to the dry contact signal. The outdoor unit is not required to be controlled to stop when the suction pressure is smaller than a fixed value. Thus, the shutdown time of the outdoor unit is more accurate, and the error shutdown is avoided. Thereby achieving the purpose of energy saving. It is also possible to ensure the accuracy of the thermal load temperature control.
When the indoor units are multiple, the indoor units correspond to one outdoor unit. The phenomenon that the indoor units are shut down successively due to inconsistent heat load cooling speed can occur. Only in the case that all indoor units are stopped, the outdoor unit is stopped. Therefore, when all indoor units are started, the outdoor unit needs to cool down all heat loads at the same time. The compressor operating frequency is relatively high. If the temperature of some heat load(s) suddenly drops to the target temperature, the temperature controller controls the corresponding indoor unit to stop. But there are other indoor units that are not shut down. Thus, the load of the outdoor unit is suddenly reduced, and the operating frequency of the compressor is not matched with the heat load. Leading to a rapid decrease in suction pressure. If the suction pressure is still smaller than the fixed value as the judging condition of the shutdown of the outdoor unit, the suction pressure can be quickly reduced to the fixed value even though the thermal load does not reach the target temperature, and then the problem of shutdown is caused. That is, a false stop is caused. In this case, the present scheme determines a target operation scheme of the outdoor unit based on two factors of the suction pressure of the compressor and the current operation frequency of the compressor. The problem that whether the outdoor unit is stopped or not is easy to cause error stopping is solved by judging whether the outdoor unit is stopped or not only according to the suction pressure.
Optionally, the processor determines a target operating scheme of the outdoor unit according to a dry contact signal between the indoor unit and the outdoor unit, including:
the processor determines that the outdoor unit continues to operate if the dry contact signal is on.
The processor determines that the outdoor unit is shut down if the dry contact signal is off.
When the number of the indoor units is 1, the indoor unit states, the electromagnetic valve switches and the dry contact signals are corresponding to each other. The indoor unit is started, the electromagnetic valve is closed, and the dry contact signal is communicated. And the indoor unit is shut down, the electromagnetic valve is disconnected, and the dry contact signal is disconnected. When the dry contact signal is always on, it indicates that the thermal load has not reached the target temperature. And at the moment, the outdoor unit is determined to keep the current running state when the heat load is required to be refrigerated continuously. When the dry contact signal changes from on to off, it is indicated that the thermal load has reached the target temperature. At this time, the outdoor unit is determined to be stopped if the heat load is not required to be cooled. Thus, when the indoor unit is stopped, the outdoor unit can be controlled to stop in time. But also can achieve the purpose of accurate temperature control. Therefore, the problems of energy waste, inaccurate temperature control and the like caused by whether the outdoor unit is stopped or not based on suction pressure are avoided.
Optionally, the processor determines a target operating scheme of the outdoor unit according to a dry contact signal between the indoor unit and the outdoor unit, including:
the processor determines that the outdoor unit continues to operate if the dry contact signal is on.
The processor determines that the outdoor unit is shut down if the dry contact signal is off.
And after the outdoor unit is stopped, and under the condition that the processor receives the dry contact signal again to be on, acquiring the electrified stopping time length of the outdoor unit.
And under the condition that the electrified shutdown time length is greater than a time length threshold value, the processor determines that the outdoor unit is started.
After the outdoor unit is stopped, when the dry contact signal is received again to be connected, the indoor unit is started again. In general, the indoor unit is turned on again, and the outdoor unit should be turned on again immediately. But frequent switching opportunities of the outdoor unit in a short time affect the life of the compressor. Thus, the time length threshold T is set 1 . Acquiring live shutdown time T of outdoor unit Stop and stop . If the outdoor unit is electrified, the machine halt time T Stop and stop ＞T 1 And determining and controlling the starting up of the outdoor unit. Otherwise, determining that the outdoor unit keeps a shutdown state. And determining and controlling the start-up of the outdoor unit until the electrified shutdown time length of the outdoor unit is greater than a time length threshold value. Thus, the influence of frequent on-off of the outdoor unit on the service life of the compressor can be reduced.
Optionally, the processor determines the target operating scheme according to the suction pressure and the current operating frequency of the compressor, including:
in the case that the suction pressure is less than or equal to the first pressure, the processor determines a target operating frequency of the compressor based on the suction pressure and the current operating frequency of the compressor.
When one outdoor unit corresponds to a plurality of indoor units, suction pressure Ps of the compressor is obtained. When all the electromagnetic valves are closed, the indoor units are started. At this time, the suction pressure of the compressor is denoted as Ps 1 The operating frequency of the compressor is fn 1 . When some electromagnetic valves are disconnected, the indoor unit is turned off. If the compressor continues at fn 1 Operation will make the suction pressure fastThe speed drops, thereby causing an erroneous stop of the outdoor unit. In this case, the operation frequency of the compressor is corrected. The suction pressure of the compressor is used as a judging condition for judging whether the operation frequency logic of the corrected compressor is entered. According to formula (1):
Ps≤Psset-ΔPsset*A
where Ps is the suction pressure of the compressor, psset is the user set point, Δpsset is the preset tolerance value, and a is the first correction factor.
If the current Ps is less than or equal to the first pressure (Psset- Δpsset a), this indicates that the suction pressure has decreased to a small level. If lowered still further, a false stop may result. At this time, a target operating frequency of the compressor is determined based on the suction pressure and the current operating frequency of the compressor. The operation frequency of the compressor is corrected, so that the problem that the outdoor unit is shut down by mistake due to the fact that the compressor continues to operate at high frequency is avoided.
Thus, the magnitude of the suction pressure of the compressor is used as a judgment condition for entering the logic for correcting the operation frequency of the compressor, and the problem of misoperation of the outdoor unit caused by the too small suction pressure of the compressor is reduced.
Optionally, the processor determines a target operating frequency of the compressor based on the suction pressure and the current operating frequency of the compressor, including:
the processor calculates a ratio of the inhalation pressure to the user-set pressure.
The processor frequency-reduces the current operating frequency according to the ratio to obtain the target operating frequency.
When the operating frequency of the compressor is corrected, the target operating frequency of the compressor is determined according to the suction pressure and the current operating frequency. Specifically, according to formula (2):
fm＝fn*(Ps/Psset)*B
wherein fm is the target operating frequency of the compressor, fn is the current operating frequency of the compressor, and B is the second correction coefficient.
The target operating frequency fm of the compressor is calculated. If the suction pressure of the compressor is changed in real time, the target operating frequency is corrected in real time according to formula (2). That is, the compressor is down-converted to reduce the operating frequency of the compressor to the frequency required for the current heat load. Thus, the compressor is operated at the determined target operating frequency, and the suction pressure is not greatly reduced, so that the risk of error shutdown is reduced.
Optionally, the processing determines a target operating scheme based on the suction pressure and the current operating frequency of the compressor, comprising:
in the case that the suction pressure is less than or equal to the first pressure, the processor determines a target operating frequency of the compressor based on the suction pressure and the current operating frequency of the compressor.
The processor determines that the compressor continues to operate at the current target operating frequency in the event that the compressor is operating at the target operating frequency and the suction pressure is greater than or equal to the second pressure for a set period of time.
And determining that the outdoor unit is shut down in the case that the compressor continues to operate at the current target operating frequency and the suction pressure is less than or equal to the shutdown threshold.
Logic is determined to enter the corrected compressor operating frequency when Ps is less than or equal to Psset- Δpsset a, i.e., when the suction pressure drop is relatively large. And corrects the compressor operating frequency according to equation (2). After the compressor is operated at the target frequency determined above, the suction pressure is increased or raised. At this time, the suction pressure of the compressor is used as a judgment condition for whether to exit the logic for correcting the operation frequency of the compressor. According to formula (3):
Ps≥Psset-ΔPsset*C
wherein C is a third correction coefficient.
If the current Ps is greater than or equal to the second pressure (Psset- Δpsset C) and for a set period of time, this indicates that the suction pressure is not dropping much more continuously. At this time, it is unnecessary to correct the operating frequency of the compressor. At this point, the logic for correcting the compressor operating frequency is exited. The compressor continues to operate at the current frequency. The method for determining the operation scheme of the outdoor unit is also applicable to the condition that no dry contact signal is connected between the indoor unit and the outdoor unit.
Setting a shutdown threshold P of an outdoor unit Stop and stop . At exit correctionAfter the logic of the compressor operating frequency, if Ps is less than or equal to P Stop and stop Indicating that the thermal load has reached the target temperature at this time. The outdoor unit may be stopped. The outdoor unit shutdown is determined and controlled. In this way, it is possible to ensure an effective shutdown of the outdoor unit in the case that the compressor exits the corrected operating frequency logic. Thereby precisely controlling the temperature and saving energy.
Alternatively, P Stop and stop And (2) not more than Psset- ΔPsset A. In this way, it is determined that the compressor enters logic for modifying the operating frequency in the event that the suction pressure of the compressor has not fallen to the shutdown threshold. Thereby realizing the effectiveness and timeliness of the correction of the running frequency of the compressor.
Optionally, under the condition that the plurality of indoor units correspond to one outdoor unit and dry contact signals are connected between the indoor units and the outdoor units, the on-off state of each indoor unit is determined according to the on-off state of the dry contact signals. The indoor unit dry contact signals are continuously sent to the processor of the outdoor unit one by one. And similarly, the outdoor unit is not stopped as long as the indoor unit dry contact signal is not disconnected. This also results in the compressor operating at high frequencies and the suction pressure rapidly dropping to the shutdown threshold, causing false shutdown problems. Therefore, when the dry contact signal is detected to be opened, the operation frequency of the compressor needs to be corrected. When Ps is equal to or less than Psset- Δpsset a, logic is determined to enter the corrected compressor operating frequency. And corrects the compressor operating frequency according to equation (2). And determining logic for exiting the corrected compressor operating frequency when Ps is greater than or equal to Psset- Δpsset C for a set duration. The compressor is operated at a current target operating frequency. Setting a shutdown threshold P Stop and stop . If Ps is equal to or less than P Stop and stop Indicating that the thermal load has reached the target temperature at this time. The outdoor unit may be stopped. The outdoor unit shutdown is determined and controlled. Therefore, the indoor unit is judged to be started or shut down through the dry contact signal, and the running frequency of the compressor is corrected under the condition that the indoor unit is started or shut down, so that the probability of error shutdown is reduced. Thereby precisely controlling the temperature and saving energy.
Optionally, the processor determines the target operating scheme according to the suction pressure and the current operating frequency of the compressor, including:
and under the condition that Ps is less than or equal to Psset-deltaPsset A, the processor determines the target operating frequency of the compressor according to the suction pressure and the current operating frequency of the compressor.
And under the condition that the compressor operates at the target operating frequency and Ps is more than or equal to Psset-DeltaPsset C for a set duration, the processor determines that the compressor operates at the current operating frequency.
At the current target operating frequency of the compressor and Ps is less than or equal to P Stop and stop In the event that the processor determines that the outdoor unit is shut down.
After the outdoor unit is shut down, the processor obtains the live shut down time of the outdoor unit and the suction pressure of the compressor.
At Ps not less than P Opening device And under the condition that the length of the electrified shutdown time is greater than a time threshold, the processor determines that the outdoor unit is started; wherein P is Opening device Is the starting threshold value of the outdoor unit.
And after the outdoor unit is stopped, acquiring the electrified stopping time length of the outdoor unit and the suction pressure Ps of the compressor. At Ps not less than P Opening device And under the condition that the electrified shutdown time length is greater than the time length threshold value, the outdoor unit is determined to be started. In this way, on the one hand, it is ensured that the suction pressure reaches the start-up threshold; on the other hand, the shutdown time of the outdoor unit is ensured to be enough, so that the influence of frequent startup and shutdown of the outdoor unit on the service life of the compressor is reduced.
Optionally, if a dry contact signal is connected between the indoor unit and the outdoor unit, the signal is equal to or greater than P at Ps Opening device And determining that the outdoor unit is started under the condition that the electrified shutdown time length of the outdoor unit is larger than a time length threshold value and the dry contact signal is on. So as to ensure that all conditions meet the starting conditions of the outdoor unit.
In practical application, when one indoor unit corresponds to one outdoor unit and a dry contact signal is connected between the indoor unit and the outdoor unit, as shown in figure 2,
s201, acquiring the on-off state of a dry contact signal; then S202 is performed;
s202, judging whether a dry contact signal is in an on state; if yes, then execution S203; if not, then S204 is performed;
s203, the outdoor unit continues to operate; then S202 is performed;
s204, stopping the outdoor unit; then S205 is performed;
s205, judging whether the dry contact signal is in an on state and T Stop and stop ＞T 1 The method comprises the steps of carrying out a first treatment on the surface of the If yes, then execution S206; if not, then S204 is performed;
s206, starting up an outdoor unit; then S201 is performed.
When a plurality of indoor units correspond to one outdoor unit, and the indoor units and the outdoor units are not connected with dry contact signals, as shown in combination with figure 3,
s301, acquiring the opening and closing states of the electromagnetic valve; then S302 is performed;
s302, judging whether all electromagnetic valves are in a disconnected state; if yes, then S303 is performed; if not, executing S304;
s303, acquiring current Ps; then, S305 is performed;
s304, obtaining Ps, psset and ΔPsset; then, S309 is executed;
s305, judging whether Ps is less than or equal to P Stop and stop The method comprises the steps of carrying out a first treatment on the surface of the If yes, then S306 is performed; if not, then S303 is performed;
s306, stopping the outdoor unit; then S307 is performed;
s307, judging whether T is Stop and stop ＞T 1 And Ps is greater than or equal to P Opening device The method comprises the steps of carrying out a first treatment on the surface of the If yes, then execution S308; if not, then S306 is performed;
s308, starting an outdoor unit; then S301 is performed;
s309, judging whether Ps is less than or equal to Psset-DeltaPsset A; if yes, then S310 is performed; if not, then S311 is performed;
s310, calculating fm from fm=fn (Ps/Psset) B; then S312 is performed;
s311, the compressor runs at the current fn; then S304 is performed;
s312, the compressor operates with the calculated fm; then, S313 is performed;
s313, judging whether Ps is equal to or greater than Psset- ΔPsset C and is continuous with T 2 The method comprises the steps of carrying out a first treatment on the surface of the If yes, then S305 is performed; if not,s310 is performed.
When a plurality of indoor units correspond to one outdoor unit, and the indoor units and the outdoor units are connected with dry contact signals, as shown in conjunction with figure 4,
s401, acquiring the on-off state of a dry contact signal; then S402 is performed;
s402, judging whether the dry contact signal is in an on state; if yes, then execution S403; if not, then S404 is performed;
s403, acquiring current Ps; then, S405 is performed;
s404, obtaining Ps, psset and ΔPsset; then, S409 is performed;
s405, judging whether Ps is less than or equal to P Stop and stop The method comprises the steps of carrying out a first treatment on the surface of the If yes, then execute S406; if not, then S403 is performed;
s406, stopping the outdoor unit; then S407 is performed;
s407, judging whether T is Stop and stop ＞T 1 Ps is greater than or equal to P on and the dry contact signal is on; if yes, then execution S408; if not, then S406 is performed;
s408, starting up an outdoor unit; then S401 is performed;
s409, judging whether Ps is less than or equal to Psset-DeltaPsset A; if yes, then S410 is performed; if not, then S411 is performed;
s410, calculating fm from fm=fn (Ps/Psset) B; then S412 is performed;
s411, the compressor runs at the current fn; then S404 is performed;
s412, the compressor operates with the calculated fm; then, S413 is performed;
s413, judging whether Ps is greater than or equal to Psset- ΔPsset C and lasting T 2 The method comprises the steps of carrying out a first treatment on the surface of the If yes, then execution S405; if not, S410 is performed.
As shown in conjunction with fig. 5, an embodiment of the present disclosure provides an apparatus for controlling an outdoor unit, including: a first determination module 51, a second determination module 52 and a control module 53. The first determining module 51 is configured to determine a state of the indoor unit. The second determining module 52 is configured to determine different target operating schemes of the outdoor unit according to a dry contact signal between the indoor unit and the outdoor unit or according to a suction pressure and a current operating frequency of the compressor in case that the indoor unit is in different states. The control module 53 is configured to control the outdoor unit to operate according to a target operation scheme.
By adopting the device for controlling the outdoor unit provided by the embodiment of the disclosure, the state of the indoor unit is firstly determined. Different states correspond to different target operating schemes of the outdoor unit. A target operating scheme may be determined based on a dry contact signal between the indoor unit and the outdoor unit. The dry contact signal state is kept synchronous with the indoor unit switch state. Thus, the target operation scheme of the outdoor unit is determined based on the dry contact signal, and the problem of error shutdown can be reduced. Another target operating scheme may be determined based on the suction pressure of the compressor and the current operating frequency. Thus, the target operation scheme of the outdoor unit is determined by combining the suction pressure and the current operation frequency, and the problem of error shutdown caused by controlling the outdoor unit to be shut down only when the suction pressure value is smaller than a fixed value can be reduced.
As shown in connection with fig. 6, an embodiment of the present disclosure provides an apparatus for controlling an outdoor unit, including a processor (processor) 60 and a memory (memory) 61. Optionally, the apparatus may also include a communication interface (Communication Interface) 62 and a bus 63. The processor 60, the communication interface 62, and the memory 61 may communicate with each other via the bus 63. The communication interface 62 may be used for information transfer. The processor 60 may call logic instructions in the memory 61 to perform the method for controlling the outdoor unit of the above-described embodiment.
Further, the logic instructions in the memory 61 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product.
The memory 61 is a computer readable storage medium that may be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 60 performs functional applications and data processing by executing program instructions/modules stored in the memory 61, i.e., implements the method for controlling the outdoor unit in the above-described embodiment.
The memory 61 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 61 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides an outdoor unit, which comprises the device for controlling the outdoor unit.
The disclosed embodiments provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an outdoor unit.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. 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). 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. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. 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.
Claims (10)
1. A method for controlling an outdoor unit having a compressor, comprising:
determining the state of an indoor unit;
under the condition that the indoor units are in different states, different target operation schemes of the outdoor unit are determined according to dry contact signals between the indoor units and the outdoor unit or according to the suction pressure and the current operation frequency of the compressor;
under the condition that a plurality of indoor units are provided and the indoor units are started, determining a target operation scheme of the outdoor unit according to the suction pressure and the current operation frequency of the compressor;
wherein, according to the suction pressure and the current operating frequency of the compressor, determining the target operating scheme of the outdoor unit comprises: determining a target operating frequency of the compressor according to the suction pressure and the current operating frequency of the compressor when the suction pressure is less than or equal to the first pressure;
wherein determining a target operating frequency of the compressor based on the suction pressure and the current operating frequency of the compressor comprises: calculating a target operating frequency of the compressor from fm=fn (Ps/Psset) B; wherein fm is the target operating frequency of the compressor, fn is the current operating frequency of the compressor, B is the second correction coefficient, ps is the suction pressure, and Psset is the user set value;
and controlling the outdoor unit to operate according to the target operation scheme.
2. The method of claim 1, wherein the state of the indoor unit comprises: the number and the switching state of the indoor units; the determining different target operation schemes of the outdoor unit according to different states of the indoor unit comprises the following steps:
and under the condition that the number of the indoor units is 1, determining a target operation scheme of the outdoor unit according to the dry contact signals between the indoor units and the outdoor unit.
3. The method of claim 2, wherein determining the target operating scheme of the outdoor unit based on the dry contact signal between the indoor unit and the outdoor unit comprises:
under the condition that the dry contact signals are connected, determining that the outdoor unit continues to operate;
and under the condition that the dry contact signal is off, determining that the outdoor unit is stopped.
4. The method of claim 1, wherein said determining a target operating schedule based on a suction pressure and a current operating frequency of the compressor further comprises:
determining that the compressor continues to operate at the current target operating frequency under the condition that the compressor operates at the target operating frequency and the suction pressure is greater than or equal to the second pressure for a set duration;
and determining that the outdoor unit is shut down in the case that the compressor continues to operate at the current target operating frequency and the suction pressure is less than or equal to the shutdown threshold.
5. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the first pressure is Psset- Δpsset a, where Δpsset is a preset allowable deviation value, and a is a first correction coefficient.
6. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the second pressure is Psset- Δpsset C, where Δpsset is a preset allowable deviation value, and C is a third correction coefficient.
7. The method according to any one of claims 2 to 6, wherein a solenoid valve is connected between the indoor unit and the outdoor unit; the on-off state of the indoor unit is determined by:
under the condition that the electromagnetic valve is closed, determining the state of the indoor unit as an opening state;
and under the condition that the electromagnetic valve is disconnected, determining that the state of the indoor unit is a shutdown state.
8. An apparatus for controlling an outdoor unit comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling an outdoor unit according to any one of claims 1 to 7 when the program instructions are run.
9. An outdoor unit comprising the apparatus for controlling an outdoor unit according to claim 8.
10. A storage medium storing program instructions which, when executed, perform the method for controlling an outdoor unit according to any one of claims 1 to 7.
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| CN202210211823.3A CN114738939B (en) | 2022-03-04 | 2022-03-04 | Method and device for controlling outdoor unit, outdoor unit and storage medium |
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| CN202210211823.3A CN114738939B (en) | 2022-03-04 | 2022-03-04 | Method and device for controlling outdoor unit, outdoor unit and storage medium |
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