CN107702280B - Control method and system of air conditioner in refrigeration mode - Google Patents
Control method and system of air conditioner in refrigeration mode Download PDFInfo
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- CN107702280B CN107702280B CN201710866315.8A CN201710866315A CN107702280B CN 107702280 B CN107702280 B CN 107702280B CN 201710866315 A CN201710866315 A CN 201710866315A CN 107702280 B CN107702280 B CN 107702280B
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000005057 refrigeration Methods 0.000 title abstract description 20
- 238000001816 cooling Methods 0.000 claims description 32
- 230000007613 environmental effect Effects 0.000 claims description 26
- 230000007704 transition Effects 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000001133 acceleration Effects 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 230000000630 rising effect Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 42
- 230000008569 process Effects 0.000 description 15
- 239000010687 lubricating oil Substances 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioners, in particular to a control method and a control system of an air conditioner in a refrigeration mode. The invention aims to solve the problem of poor quick refrigerating effect caused by long frequency boosting time in the starting frequency boosting control method of the conventional air conditioner. To this end, the control method of the present invention includes: starting an outer fan and accelerating to a first target rotating speed; adjusting the opening degree of the expansion valve to a first target opening degree; starting the compressor when the external fan and/or the expansion valve reach the set conditions; and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds. The frequency rising time of the compressor can be greatly shortened while normal oil return of the compressor is guaranteed by the aid of the arrangement mode, so that the purpose of quick refrigeration is achieved, comfort of an air conditioner is improved, and user experience is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control system of an air conditioner in a refrigeration mode.
Background
With the increasing living standard, the requirements of people on the quality of life are higher and higher, and the requirements are particularly obvious on household appliances. Taking an air conditioner as an example, in order to meet the requirement of a user on quick refrigeration and bring more comfortable use experience, the conventional air conditioner can generally enable a compressor to quickly increase the frequency to be operated at a higher frequency when the air conditioner is just started. When the compressor is operated, refrigerant in the compressor is rapidly discharged to circulate in the pipe system. In the circulation process, the lubricating oil is discharged out of the compressor along with the refrigerant and enters the pipeline, and the dynamic balance of the lubricating oil in the whole system can be maintained only if the discharged part of the lubricating oil smoothly returns to the compressor (namely, oil return), otherwise, the compressor is damaged due to oil shortage. Most of air conditioners in the market at present adopt an arrangement mode of combining an oil separator and an oil return capillary tube, and lubricating oil discharged from a compressor is separated out through the oil separator and then returns to the compressor through the oil return capillary tube. However, in the case of the inverter air conditioner, as the operating frequency of the compressor increases, the discharge speed/velocity of the lubricating oil becomes faster and faster, and when the discharge speed/velocity of the lubricating oil exceeds the maximum oil return speed/velocity of the oil return capillary tube, the oil shortage phenomenon is easily generated. Therefore, in order to ensure normal oil return, during the process of rapidly raising the frequency of the compressor to a high frequency, the compressor is usually forced to operate for a period of time at a certain fixed frequency (oil return frequency), and the frequency raising is continued after the oil return is stable.
Although normal oil return has been guaranteed to above-mentioned mode of setting, the compressor of force lasts the mode of setting of operation a period on the oil return frequency for the air conditioner is at the quick refrigeration in-process of start, and the frequency rise time overlength of compressor has slowed down the speed that the compressor reaches maximum operating frequency, has just also increased the quick refrigerated time after the air conditioner start, and then influences the quick refrigerated effect of air conditioner, experiences for the user brings not good use. That is, the conventional method for controlling the frequency rise of the air conditioner during starting has the problem of poor quick cooling effect caused by long frequency rise time.
Accordingly, there is a need in the art for a new control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of poor rapid cooling effect caused by long frequency-raising time in the conventional method for controlling the start-up frequency-raising of the air conditioner, the present invention provides a method for controlling an air conditioner in a cooling mode, which comprises the following steps:
starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration;
adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed;
when the external fan and/or the expansion valve reach set conditions, starting a compressor of the air conditioner;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
In a preferable embodiment of the control method of the air conditioner in the cooling mode, the control method further includes:
after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency;
stopping the compressor from increasing frequency when the compressor frequency reaches the first target frequency.
In a preferred embodiment of the method for controlling an air conditioner in the cooling mode, the step of "adjusting an opening degree of an expansion valve of the air conditioner to a first target opening degree" further includes:
reducing the opening degree of the expansion valve to a reference opening degree according to a set valve closing speed;
when the expansion valve opening degree reaches the reference opening degree, the expansion valve opening degree is increased to the first target opening degree at a set valve opening speed.
In a preferred embodiment of the method for controlling an air conditioner in the cooling mode, the step of "starting a compressor of the air conditioner when the external air blower and/or the expansion valve reach a predetermined condition" further includes:
and when the outer fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, starting a compressor of the air conditioner.
In a preferred embodiment of the method for controlling an air conditioner in the cooling mode, the step of "causing the compressor to perform sequential frequency raising in stages at a plurality of frequency raising speeds" further includes:
enabling the compressor to perform frequency boosting according to a first frequency boosting speed;
judging whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the compressor is enabled to carry out frequency raising according to a second frequency raising speed;
wherein the transition frequency is less than the first target frequency.
In a preferable technical solution of the control method of the air conditioner in the cooling mode, the first frequency-increasing speed is greater than the second frequency-increasing speed; and/or
The first target frequency is a maximum operating frequency of the compressor; and/or
The first target rotating speed is the maximum working rotating speed of the outer fan; and/or
The first target opening degree is an expansion valve opening degree matched with the first target frequency.
In a preferable embodiment of the control method of the air conditioner in the cooling mode, the control method further includes:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency; and is
Reducing the rotating speed of the outer fan to a second target rotating speed; and is
Decreasing the expansion valve opening to a second target opening;
the environment parameter is an environment temperature or an environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
The present invention also provides a control system of an air conditioner in a cooling mode, the control system including:
the first control module is used for starting an external fan of the air conditioner and accelerating the external fan to a first target rotating speed according to a set acceleration;
a second control module for decreasing an opening degree of an expansion valve of the air conditioner to a reference opening degree at a set valve closing speed while, before, or after the external air blower starts to increase in speed, and increasing the expansion valve to a first target opening degree at a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
a third control module, configured to start a compressor of the air conditioner and to successively up-convert the compressor in stages at a plurality of up-conversion speeds when the external blower reaches the first target rotation speed and/or the expansion valve reaches the reference opening degree, and to stop up-converting the compressor when the compressor frequency reaches the first target frequency;
and the judging module is used for judging whether the outer fan is accelerated to the first target rotating speed, whether the expansion valve reaches the reference opening degree and whether the compressor frequency reaches the first target frequency.
In a preferable embodiment of the control system of the air conditioner in the cooling mode, the third control module sequentially boosts the frequency of the compressor in stages at a plurality of boosting speeds in the following manner:
the third control module enables the compressor to carry out frequency increasing according to the first frequency increasing speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the third control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed;
wherein the transition frequency is less than the first target frequency; and/or the first up-conversion speed is greater than the second up-conversion speed.
In a preferable embodiment of the control system of the air conditioner in the cooling mode, the control system further includes:
the acquisition module is used for acquiring environmental parameters;
the judging module is also used for judging whether the environmental parameters reach target parameters;
the first control module is further used for reducing the rotating speed of the outer fan to a second target rotating speed when the environmental parameter reaches the target parameter;
the second control module is further used for reducing the opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the third control module is further configured to down-convert the compressor to a second target frequency when the environmental parameter reaches the target parameter;
the environment parameter is an environment temperature or an environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, a method for controlling an air conditioner in a cooling mode includes: starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration; adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree; when the external fan and/or the expansion valve reach the set conditions, starting the compressor of the air conditioner; continuously increasing the frequency of the compressor in stages according to a plurality of frequency increasing speeds; judging whether the frequency of the compressor reaches a first target frequency or not; and stopping the frequency increasing of the compressor when the frequency of the compressor reaches the first target frequency. Preferably, the compressor of the air conditioner is started when the external fan reaches the first target rotation speed and the expansion valve reaches the reference opening degree. By canceling the continuous operation stage on the oil return frequency in the frequency increasing process of the compressor and continuously increasing the frequency of the compressor in stages at different frequency increasing speeds after the compressor is started, the invention can greatly shorten the frequency increasing time of the compressor, thereby achieving the purpose of quick refrigeration, improving the comfort of the air conditioner and improving the user experience. The outer fan is enabled to reach the first target rotating speed before the compressor is started, the opening degree of the expansion valve is reduced to the reference opening degree, namely, the high rotating speed is used for driving air to flow to dissipate heat of the compressor in advance, and the opening degree of the expansion valve is enabled to be matched with the compressor in advance when the compressor is started, so that the compressor can have good heat dissipation conditions and matched opening degree of the expansion valve before being started, the situation that the heat dissipation effect of the compressor is poor and the matching degree of the opening degree of the expansion valve and the compressor is poor due to the fact that the outer fan and the expansion valve are started together with the compressor is avoided, and the refrigeration effect of the compressor after being started is rapidly improved.
Specifically, the compressor is started when the external fan reaches the maximum rotating speed and the expansion valve is reduced to the reference opening degree, the compressor is firstly subjected to frequency boosting according to a first frequency boosting speed after being started, the compressor is subjected to frequency boosting according to a second frequency boosting speed when the frequency of the compressor reaches a transition frequency, and the compressor is stopped from frequency boosting when the frequency of the compressor reaches a first target frequency. The transition frequency is smaller than the first target frequency, and the first frequency increasing speed is larger than the second frequency increasing speed. Preferably, the first target frequency is a maximum operating frequency of the compressor. Repeated experiments show that when the external fan reaches the maximum rotating speed and the expansion valve reaches the reference opening degree, the compressor performs frequency boosting in two or more stages at the first-speed and last-slow frequency boosting speed.
Drawings
The control method and system of the air conditioner in the cooling mode according to the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a flowchart illustrating a control method of an air conditioner in a cooling mode according to the present invention;
fig. 2 is a schematic diagram comparing the frequency increasing process of the compressor of the control method of the air conditioner in the cooling mode according to the present invention with that of the prior art compressor;
fig. 3 is a control logic diagram of a compressor, an external fan and an expansion valve of the control method of the air conditioner in the cooling mode according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present invention is described in connection with an embodiment in which the compressor is provided with two frequency-increasing stages, the arrangement is not always the same, and those skilled in the art can apply the method of the present invention to other application scenarios without departing from the principle of the present invention, for example, the compressor may be provided with three or more frequency-increasing stages.
Referring to fig. 1, fig. 1 is a flow chart illustrating a control method of an air conditioner in a cooling mode according to the present invention.
As shown in fig. 1, in order to solve the problem of poor quick cooling effect caused by long frequency boosting time in the starting up frequency boosting control method of the existing air conditioner, the invention provides a control method of an air conditioner in a cooling mode, which mainly comprises the following steps:
s100, starting an external fan of the air conditioner, accelerating to a first target rotating speed according to a set acceleration, starting the air conditioner according to the acceleration which is increased by 1000r/min per second if a user presses a starting switch of the air conditioner to start the air conditioner and selects a refrigeration mode, and reaching the first target rotating speed of 3000r/min in 3 seconds, wherein the first target rotating speed is preferably the maximum working rotating speed of the external fan;
s200, rapidly adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed, if the outer fan is started, the expansion valve is firstly reduced to a reference opening degree according to a valve closing speed from 480 steps, and then is increased to the first target opening degree according to a valve opening speed from the reference opening degree, and preferably, the expansion valve is an electronic expansion valve or other expansion valves capable of controlling the opening degree;
it should be noted that the opening adjustment of the electronic expansion valve is driven by the stepping motor, and the minimum angle range of the stepping motor is called one step, so the opening adjustment of the electronic expansion valve is generally measured by "steps". For example, the opening degree of the expansion valve is 200 steps. I.e. the stepper motor drives the expansion valve to rotate to the 200 th angular unit. In general, when the air conditioner is in the closed state, the expansion valve is in a larger opening degree to balance the system pressure, and the opening degree of the expansion valve in the closed state of the air conditioner may be 480 steps. The reference opening is the opening corresponding to the outdoor temperature and the compressor frequency according to the operation mode, and the setting of the reference opening is beneficial to the establishment of system pressure difference, so that the quick cooling and quick heating of the air conditioner are realized. The reference opening degree may be 280 steps according to the present invention. That is, while the outside fan is started, the expansion valve opening degree is first decreased from 480 steps to 280 steps at a valve closing speed of, for example, 200P/s (i.e., 200 steps/sec), and then increased from 280 steps to a first target opening degree at a valve opening speed of, for example, 40P/s (e.g., 400 steps).
S300, starting a compressor of the air conditioner when the external fan and/or the expansion valve reach set conditions, for example, starting the compressor of the air conditioner in the process that the rotating speed of the external fan is increased to a first target rotating speed and/or the opening degree of the expansion valve is adjusted to a first target opening degree, and preferably, starting the compressor of the air conditioner when the external fan reaches the first target rotating speed and the expansion valve reaches a reference opening degree at the same time;
s400, continuously increasing the frequency of the compressor in stages according to a plurality of frequency increasing speeds, for example, after the compressor is started, increasing the frequency of the compressor according to a first frequency increasing speed, and immediately switching to a second frequency increasing speed to continuously increase the frequency after the compressor operates to a certain frequency or operates for a period of time;
s500, judging whether the frequency of the compressor reaches a first target frequency, acquiring the current frequency of the compressor in real time, and comparing the current frequency with the first target frequency;
s600, when the frequency of the compressor reaches the first target frequency, the compressor stops increasing the frequency, and if the current frequency reaches the first target frequency, the compressor is maintained at the first target frequency to continue working. Preferably, the first target opening degree is an expansion valve opening degree that matches a first target frequency of the compressor, that is, the expansion valve opening degree also increases from the reference opening degree to the first target opening degree just during the consecutive upshifting to the first target frequency in stages of the start-up of the compressor.
It can be seen from the above description that the control method of the air conditioner of the present invention can create a good heat dissipation condition for the compressor in advance by starting the compressor when the external fan reaches the maximum operating speed, and can match the opening degree of the expansion valve with the operating frequency of the compressor when the compressor is started by starting the expansion valve when the expansion valve reaches the reference opening degree, thereby avoiding the situations that the heat dissipation effect of the compressor is not good and the opening degree of the expansion valve is not matched with the compressor due to the fact that the external fan and the expansion valve are started together with the compressor. The compressor is started and then continuously raised in stages at different raising frequency speeds, so that the raising frequency time of the compressor can be greatly shortened, the refrigeration effect of the started compressor is improved, and the aim of rapid refrigeration is fulfilled. In other words, the method cancels the process of continuously running on the oil return frequency in the frequency rising process of the compressor, and adopts the mode of opening the outer fan in advance for heat dissipation, adjusting the opening degree of the expansion valve to the reference opening degree and controlling the frequency rising speed of the compressor, so that the normal oil return of the compressor is ensured, the rapid frequency rising of the compressor can be completed, the problem of poor rapid refrigeration effect caused by long frequency rising time in the conventional starting frequency rising control method is solved, the comfort of the air conditioner is improved, and the user experience is improved.
Of course, the first target rotation speed is not limited to one form of the maximum working rotation speed, and in the case that the heat dissipation condition of the compressor can be improved, a person skilled in the art can set the first target rotation speed to any reasonable value, so that it meets more specific application scenarios, for example, the first target rotation speed may also be a certain rotation speed value close to the maximum working rotation speed of the external fan or a maximum rotation speed value that the external fan can reach at the external environment temperature.
The principles of the present invention are further explained with reference to fig. 2. Fig. 2 is a schematic diagram comparing the frequency increasing process of the compressor of the control method of the air conditioner in the cooling mode of the present invention with that of the compressor of the prior art. In fig. 2, a solid line represents an up-conversion process of the compressor in the control method of the present invention, and a dotted line represents an up-conversion process of the compressor in the related art.
As shown in fig. 2, in the prior art, a fixed frequency-increasing speed V (e.g. 1Hz/s) is generally adopted for frequency-increasing after the compressor is started, and a first oil-returning frequency f is set during the frequency-increasing process to ensure normal oil-returning of the compressor1And a second oil return frequency f2When the compressor is raised to the first oil return frequency f1When the frequency of the compressor is increased, the frequency of the compressor is increased at the frequency increasing speed V, and the frequency of the compressor is increased at the frequency increasing speed V. Likewise, the frequency of the compressor is increased to a second oil return frequency f2And maintaining the frequency for a period of time to ensure that the compressor continues to increase the frequency after stable oil return until the compressor reaches the maximum frequency fmaxAnd then stopping the frequency raising. As described in the background, such an up-conversion is due to the first oil return frequency f1And a second oil return frequency f2The compressor is maintained for a period of time, so the frequency rising speed of the compressor is seriously influenced, and although the stable oil return of the compressor is ensured, the requirement of quick refrigeration cannot be well met.
With continued reference to FIG. 2, as a preferred embodiment of the present invention, a continuous compressor ramp-up is possibleThe frequency process is divided into two stages, wherein the first stage compressor is at a first up-conversion speed V1And performing frequency raising, and entering a second stage when the frequency is raised to the transition frequency. The second stage compressor at a second raising speed V2And performing frequency raising, and stopping frequency raising when the frequency is raised to the first target frequency. Preferably, the transition frequency may be set to the first oil return frequency f1. First raising frequency speed V1Greater than the second up-conversion speed V2For example, the first up-conversion rate may be set to 1.2Hz/s and the second up-conversion rate may be set to 0.5 Hz/s.
That is to say, in the control method of the present invention, S400 may further include the following steps:
s410, enabling the compressor to follow a first frequency increasing speed V1Performing frequency raising, such as raising the frequency of the compressor at a frequency raising speed of 1.2Hz/s by a control system of the air conditioner;
s420, judging whether the frequency of the compressor reaches the transition frequency, if so, setting the transition frequency as a first oil return frequency f1The control system judges whether the current frequency of the compressor reaches the first oil return frequency f1；
S430, reaching the transition frequency f at the compressor frequency1While the compressor is driven at a second up-conversion speed V2Performing frequency raising, e.g. at the control system determining that the current frequency of the compressor reaches f1And continuously increasing the frequency of the compressor according to the frequency increasing speed of 0.5Hz/s so as to continuously increase the frequency on the premise of ensuring the stable oil return of the compressor and finish the quick refrigeration of the air conditioner.
Preferably, the transition frequency f1Less than a first target frequency set to the maximum operating frequency f of the compressormax。
The advantages of the above arrangement are: by controlling the frequency-raising speed of the compressor in the frequency-raising process, the speed/speed of the lubricating oil discharged from the compressor is correspondingly changed in the frequency-raising process of the compressor at different frequency-raising speeds, so that the oil return speed/speed of the oil return capillary tube is adapted, and the oil return stability of the compressor is ensured. Specifically, by making the compressor at the transition frequency f1Varying the rate of raising the frequency, i.e.The frequency raising is carried out in two stages of raising frequency speed with high speed before low speed, so that the compressor is at the first raising frequency speed V1At the time of frequency increase, the speed/rate of the lubricant oil discharged from the compressor reaches or exceeds the oil return speed/rate of the oil return capillary tube, and the lubricant oil in the compressor is gradually reduced. When the transition frequency f is reached1While the compressor is switched to follow the second raising speed V2The frequency is increased, the lubricating oil flowing out of the compressor is greatly reduced, the speed/speed of the lubricating oil discharged out of the compressor is smaller than the oil return speed/speed of the oil return capillary tube, and the lubricating oil quantity in the compressor is further ensured. That is to say, the invention can ensure the normal oil return of the compressor through the change of the frequency raising speed, and simultaneously correspondingly accelerate the frequency raising speed of the compressor by canceling the control mode of the continuous operation stage on the oil return frequency, so that the compressor can be raised to the maximum working frequency more quickly, and then the compressor can be operated at the maximum working frequency, thereby meeting the requirement of quick refrigeration of users. As is apparent from fig. 2, through repeated experiments by the inventor, the time for the compressor of the present invention to reach the maximum operating frequency is significantly less than the time for the compressor of the prior art to reach the maximum operating frequency.
It should be noted that the above preferred setting manner and specific values are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can also make any type of adjustment on the above parameters without departing from the principle of the present invention, as long as the adjusted technical scheme can improve the condition of increasing the frequency raising speed on the premise of ensuring the normal oil return of the compressor. If the frequency raising stage can be further divided into three stages, each stage raises the frequency at different frequency raising speeds (such as fast and slow modes); the transition frequency can also float up and down according to the first oil return frequency; the first target frequency is not the maximum operating frequency of the compressor but a value close to the maximum operating frequency, etc.
In addition, in order to better improve the experience of the user using the air conditioner, when the compressor operates at the maximum operating frequency, the control method of the air conditioner of the present invention may further include the steps of:
s700, acquiring environmental parameters, such as current environmental temperature (such as indoor temperature);
s800, when the environmental parameter reaches/approaches the target parameter, reducing the frequency of the compressor to a second target frequency, simultaneously reducing the rotating speed of the outer fan to the second target rotating speed, and reducing the opening degree of the expansion valve to the second target opening degree, for example, when the indoor temperature reaches the target temperature set by a user or approaches the target temperature, reducing the frequency of the compressor to a rated working frequency or a working frequency matched with the external environmental temperature, simultaneously reducing the rotating speed of the outer fan to the rated working rotating speed or the working rotating speed matched with the compressor, and reducing the opening degree of the expansion valve to an opening degree matched with the current working frequency of the compressor.
The advantages of this arrangement are: after the air conditioner is rapidly cooled for a period of time, the indoor temperature is correspondingly reduced, when the ambient temperature reaches/approaches the temperature set by a user, the compressor does not need to continuously work at the maximum working frequency, the external fan does not need to work at the maximum rotating speed for heat dissipation naturally, and the expansion valve does not need to work at the first target opening degree matched with the compressor. At this time, the compressor is reduced to the rated working frequency or the working frequency more matched with the current environment (such as outdoor temperature), the rotating speed of the outer fan is reduced to the rated working rotating speed or the rotating speed matched with the compressor, and the opening degree of the expansion valve is reduced to the opening degree matched with the compressor, so that the normal work of the air conditioner can be ensured, and the working life of the compressor, the outer fan and the expansion valve can be effectively prolonged.
Of course, the environmental parameter and the corresponding target parameter are not all the same, but may be environmental humidity (such as indoor/outdoor humidity), target humidity set by the user, and the like.
The invention also provides a control system of the air conditioner in the refrigeration mode, which mainly comprises:
the first control module is used for starting an external fan of the air conditioner and accelerating to a first target rotating speed according to a set acceleration, and after the air conditioner is started and cooled, the first control module enables the external fan to accelerate to a maximum working rotating speed according to the set acceleration;
a second control module for reducing an opening degree of an expansion valve of the air conditioner to a reference opening degree according to a set valve closing speed while, before or after the external fan starts to increase the speed, and increasing the expansion valve to a first target opening degree according to a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
the third control module is used for starting the compressor when the external fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds, and stopping increasing the frequency of the compressor when the frequency of the compressor reaches the first target frequency;
and the judging module is used for judging whether the outer fan reaches a first target rotating speed, whether the opening degree of the expansion valve reaches a reference opening degree and whether the compressor reaches a first target frequency.
Wherein the third control module continuously boosts the frequency of the compressor in stages at a plurality of boost speeds in the following manner:
the third control module makes the compressor at the first frequency raising speed V1Performing frequency boosting;
the judging module judges whether the frequency of the compressor reaches the transition frequency f1；
Reaching a transition frequency f at the compressor frequency1While the third control module makes the compressor at the second frequency-raising speed V2Performing frequency boosting;
preferably, the first up-conversion speed V1Greater than the second up-conversion speed V2Transition frequency f1Less than a first target frequency, and the first target frequency is the maximum operating frequency f of the compressormaxThe first target opening degree is equal to the maximum working frequency fmaxMatched opening degree of the expansion valve.
In addition, the control system of the air conditioner further includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring environmental parameters, such as outdoor/indoor temperature, outdoor/indoor humidity and the like;
after the acquisition module acquires the environmental parameter, the judgment module is further used for judging whether the environmental parameter reaches a target parameter, such as a target temperature of refrigeration set by a user or a set target humidity;
the first control module is also used for reducing the rotating speed of the outer fan to a second target rotating speed when the environmental parameter reaches the target parameter; the second control module is also used for reducing the opening of the expansion valve to a second target opening when the environmental parameter reaches the target parameter; the third control module is further used for enabling the compressor to reduce the frequency to a second target frequency when the environmental parameter reaches the target parameter, and if the indoor temperature reaches the target temperature set by a user, the third control module firstly enables the compressor to reduce the frequency to the rated working frequency, then the first control module enables the rotating speed of the outer fan to be reduced to the rated working rotating speed, and the second control module enables the opening degree of the expansion valve to be reduced to the opening degree matched with the rated working frequency of the compressor.
Those skilled in the art can understand that the physical forms of the first control module, the second control module, the third control module and the judgment module can be independent from each other, and certainly can be functional units integrated on one physical module. The control system of the air conditioner comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the computer program can complete the functions of the first control module, the second control module, the third control module and the judgment module.
The operation principle of the control method and system of the air conditioner in the cooling mode according to the present invention will be briefly described with reference to fig. 3. Fig. 3 is a control logic diagram of a compressor, an external fan and an expansion valve of the control method of the air conditioner in the cooling mode according to the present invention.
As shown in fig. 3, when the air conditioner is in the cooling mode, the working process of the external fan, the expansion valve and the compressor may be as follows:
air conditioner start-up refrigeration → external fan according to acceleration a1' increase the rotation speed while the expansion valve is closed at a valve closing speed V21' Slave opening degree B1' Start decrease opening → Via T1After a time interval, the outer fan reaches the maximum working speed n'1The expansion valve reaches the reference opening degree B'2At the same time, the compressor is started and the frequency is increased according to the increasing speed V11The frequency is increased, the external fan keeps the maximum working speed to operate, and the expansion valve is opened according to the valve speed V22' increasing opening → meridian T2Compressor frequency to transition frequency f 'after time interval'1At an up-conversion speed V12' continuously increasing frequency, the expansion valve continuously according to the valve opening speed V22' increasing opening → meridian T3Compressor frequency reaches maximum operating frequency f 'after a time interval'2Stopping raising the frequency, and opening degree of the expansion valve reaches f'2Matched B'3And is stabilized at the opening → the meridian T4After a time interval, the indoor temperature reaches the set temperature of the user, and the compressor reduces the frequency at a speed V13' Down-conversion while the outer fan is accelerated by an acceleration a2' reduced speed, expansion valve closing speed V23' reduced opening → warp T5Compressor frequency reduction to rated operating frequency f 'after time interval'3And maintaining the frequency, and simultaneously reducing the rotating speed of the outer fan to the rated working rotating speed n'1And maintained at this frequency, the expansion valve opening is reduced to f'3Matched B'4And maintained at this frequency.
In the above preferred embodiment, the air conditioner control method mainly includes: starting an outer fan and accelerating to the maximum working speed according to the set acceleration; simultaneously, the expansion valve is reduced to the reference opening degree according to the set valve closing speed; when the external fan reaches the maximum working rotating speed and the opening degree of the expansion valve reaches the reference opening degree, starting the compressor, continuously increasing the frequency according to a first frequency increasing speed and a second frequency increasing speed, and increasing the opening degree of the expansion valve according to a valve opening speed; judging whether the frequency of the compressor reaches the maximum working frequency or not; and stopping raising the frequency when the frequency of the compressor reaches the maximum working frequency, and simultaneously enabling the expansion valve to reach the opening degree matched with the maximum working frequency. Wherein the first frequency increasing speed is larger than the second frequency increasing speed. The control system of the air conditioner comprises a first control module, a second control module, a third control module, a judgment module and a collection module. The compressor can create good working conditions for the compressor in advance through the outer fan and the expansion valve, ensure normal oil return of the compressor through the change of the frequency boosting speed of the compressor, quickly boost the frequency to the maximum working frequency, further operate at the maximum working frequency, and meet the requirement of quick refrigeration of a user.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioner in a cooling mode is characterized by comprising the following steps:
starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration;
adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed;
when the external fan and/or the expansion valve reach set conditions, starting a compressor of the air conditioner;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
2. The control method of an air conditioner in a cooling mode according to claim 1, further comprising:
after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency;
stopping the compressor from increasing frequency when the compressor frequency reaches the first target frequency.
3. The method of claim 2, wherein the step of adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree further comprises:
reducing the opening degree of the expansion valve to a reference opening degree according to a set valve closing speed;
when the expansion valve opening degree reaches the reference opening degree, the expansion valve opening degree is increased to the first target opening degree at a set valve opening speed.
4. The method as claimed in claim 3, wherein the step of starting the compressor of the air conditioner when the outdoor fan and/or the expansion valve reaches a set condition further comprises:
and when the outer fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, starting a compressor of the air conditioner.
5. The method as claimed in claim 2, wherein the step of "causing the compressor to sequentially increase in frequency in stages at a plurality of increasing frequency speeds" further comprises:
enabling the compressor to perform frequency boosting according to a first frequency boosting speed;
judging whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the compressor is enabled to carry out frequency raising according to a second frequency raising speed;
wherein the transition frequency is less than the first target frequency.
6. The control method of an air conditioner in a cooling mode according to claim 5,
the first frequency increasing speed is greater than the second frequency increasing speed; and/or
The first target frequency is a maximum operating frequency of the compressor; and/or
The first target rotating speed is the maximum working rotating speed of the outer fan; and/or
The first target opening degree is an expansion valve opening degree matched with the first target frequency.
7. The control method of an air conditioner in a cooling mode according to any one of claims 1 to 6, further comprising:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency; and is
Reducing the rotating speed of the outer fan to a second target rotating speed; and is
Decreasing the expansion valve opening to a second target opening;
the environment parameter is an environment temperature or an environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
8. A control system for an air conditioner in a cooling mode, the control system comprising:
the first control module is used for starting an external fan of the air conditioner and accelerating the external fan to a first target rotating speed according to a set acceleration;
a second control module for reducing an opening degree of an expansion valve of the air conditioner to a reference opening degree at a set valve closing speed while, before, or after the external air blower starts to increase the speed, and increasing the opening degree of the expansion valve to a first target opening degree at a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
a third control module, configured to start a compressor of the air conditioner and to successively up-convert the compressor in stages at a plurality of up-conversion speeds when the external blower reaches the first target rotation speed and/or the expansion valve reaches the reference opening degree, and to stop up-converting the compressor when the compressor frequency reaches the first target frequency;
and the judging module is used for judging whether the outer fan reaches the first target rotating speed, whether the opening of the expansion valve reaches the reference opening and whether the frequency of the compressor reaches the first target frequency.
9. The control system of an air conditioner in a cooling mode according to claim 8, wherein the third control module sequentially boosts the compressor in stages at a plurality of boosting speeds in the following manner:
the third control module enables the compressor to carry out frequency increasing according to the first frequency increasing speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the third control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed;
wherein the transition frequency is less than the first target frequency; and/or
The first frequency-increasing speed is greater than the second frequency-increasing speed.
10. The control system of an air conditioner in a cooling mode as set forth in claim 8, further comprising:
the acquisition module is used for acquiring environmental parameters;
the judging module is also used for judging whether the environmental parameters reach target parameters;
the first control module is further used for reducing the rotating speed of the outer fan to a second target rotating speed when the environmental parameter reaches the target parameter;
the second control module is further used for reducing the opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the third control module is further configured to down-convert the compressor to a second target frequency when the environmental parameter reaches the target parameter;
the environment parameter is an environment temperature or an environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
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| CN108534321A (en) * | 2018-03-31 | 2018-09-14 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548291A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548289A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning |
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| CN108444062A (en) * | 2018-03-31 | 2018-08-24 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548304B (en) * | 2018-03-31 | 2020-08-25 | 青岛海尔空调器有限总公司 | Control method of air conditioner |
| CN108758995A (en) * | 2018-03-31 | 2018-11-06 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548292A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548288A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning |
| CN108548303A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108397878A (en) * | 2018-03-31 | 2018-08-14 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under heating mode |
| CN108548301B (en) * | 2018-03-31 | 2021-09-21 | 青岛海尔空调器有限总公司 | Starting control method of air conditioner |
| CN108534322B (en) * | 2018-03-31 | 2021-04-20 | 青岛海尔空调器有限总公司 | Starting control method of air conditioner |
| CN108444069A (en) * | 2018-03-31 | 2018-08-24 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under refrigeration mode |
| CN108548287A (en) * | 2018-03-31 | 2018-09-18 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under heating mode |
| CN108758998B (en) * | 2018-03-31 | 2020-11-17 | 青岛海尔空调器有限总公司 | Control method of air conditioner |
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| CN108759022A (en) * | 2018-03-31 | 2018-11-06 | 青岛海尔空调器有限总公司 | The control method of air-conditioning under heating mode |
| CN109028491B (en) * | 2018-08-13 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Variable frequency air conditioner compressor soft start method and system and air conditioner |
| CN112413837B (en) * | 2019-08-22 | 2024-06-18 | 郑州海尔空调器有限公司 | Variable frequency air conditioner control method and device, air conditioner and storage medium |
| CN110542193A (en) * | 2019-09-13 | 2019-12-06 | 广东希塔变频技术有限公司 | Control method and control device for air conditioning equipment and air conditioning equipment |
| CN111059836B (en) * | 2019-12-27 | 2023-10-20 | 青岛海尔智能技术研发有限公司 | Control method for refrigerating and freezing device and refrigerating and freezing device |
| CN113108423B (en) * | 2021-03-29 | 2022-07-26 | 广东科学技术职业学院 | Air conditioner starting control method |
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| JP2551238B2 (en) * | 1990-12-25 | 1996-11-06 | ダイキン工業株式会社 | Operation control device for air conditioner |
| CN102147174B (en) * | 2011-03-24 | 2013-04-17 | 中国扬子集团滁州扬子空调器有限公司 | Method for controlling electronic expansion valve of variable-frequency air conditioner |
| CN103968497B (en) * | 2013-01-30 | 2017-05-10 | 珠海格力电器股份有限公司 | Method and device for adjusting running frequency of air conditioner compressor and air conditioner |
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Effective date of registration: 20200911 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201102 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. |