CN107576113B - Control method and system of air conditioner under high-humidity heating working condition - Google Patents
Control method and system of air conditioner under high-humidity heating working condition Download PDFInfo
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- CN107576113B CN107576113B CN201710865354.6A CN201710865354A CN107576113B CN 107576113 B CN107576113 B CN 107576113B CN 201710865354 A CN201710865354 A CN 201710865354A CN 107576113 B CN107576113 B CN 107576113B
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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 under a high-humidity heating working condition. The invention aims to solve the problem of poor quick heating effect caused by long frequency boosting time in the starting up frequency boosting control method of the conventional air conditioner. To this end, the control method of the present invention includes: acquiring the environmental humidity; when the environmental humidity is higher than the set humidity, the opening degree of the expansion valve is adjusted to a first target opening degree; starting a compressor of an air conditioner in a process of adjusting an opening degree of an expansion valve to a first target opening degree; and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds. By 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 while ensuring the normal oil return of the compressor, thereby achieving the purpose of rapid heating, improving the comfort of the air conditioner and improving the user experience.
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 under a high-humidity heating working condition.
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 for quick heating and bring more comfortable use experience, the existing air conditioner can generally make the compressor quickly increase the frequency to a higher frequency for operation 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 is guaranteed by the arrangement mode, the compressor is forced to continuously run for a period of time on the oil return frequency, so that the frequency rising time of the compressor is too long in the process of quick heating of the air conditioner during starting, the speed of the compressor reaching the maximum working frequency is slowed down, the time for quick heating after the air conditioner is started is increased, the effect of quick heating of the air conditioner is influenced, and poor use experience is brought to a user. That is, the conventional method for controlling the frequency rise of the air conditioner during starting has the problem of poor quick heating effect due to 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 heating effect caused by long frequency-raising time in the conventional method for controlling the start-up frequency-raising of the air conditioner, the invention provides a method for controlling the air conditioner under the high-humidity heating working condition, which comprises the following steps:
acquiring the environmental humidity;
when the environment humidity is higher than the set humidity, adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree;
starting a compressor of the air conditioner in the process of adjusting the opening degree of the expansion valve to the first target opening degree;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
In a preferable technical solution of the control method of the air conditioner under the high-humidity heating condition, 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 under the high-humidity heating condition, the step of "adjusting the 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 under the high-humidity heating condition, the step of "starting a compressor of the air conditioner in a process of adjusting an opening degree of an expansion valve to the first target opening degree" further includes:
and starting the compressor when the expansion valve reaches the reference opening degree.
In a preferred embodiment of the method for controlling an air conditioner under the high-humidity heating condition, the step of "causing the compressor to continuously increase the frequency in stages at a plurality of set 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 under the high-humidity heating working condition, 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 opening degree is an expansion valve opening degree matched with the first target frequency; and/or the set humidity is 60%.
In a preferable technical solution of the control method of the air conditioner under the high-humidity heating condition, the control method further includes:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, reducing the frequency of the compressor to a second target frequency, and reducing the opening degree of the expansion valve to a second target opening degree;
the environment parameter is an environment temperature or the environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
The invention also provides a control system of the air conditioner under the high-humidity heating working condition, which mainly comprises the following components:
the acquisition module is used for acquiring the environmental humidity;
a first control module configured to reduce an opening degree of an expansion valve of the air conditioner to a reference opening degree at a set valve closing speed when the ambient humidity is greater than a set humidity, and increase 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 second control module, configured to start a compressor of the air conditioner and to successively up-convert the compressor in stages at a plurality of set speeds when the opening degree of the expansion valve reaches the reference opening degree, and to stop up-convert the compressor when the frequency of the compressor reaches a first target frequency;
and the judging module is used for judging whether the environment humidity is greater than the set humidity, whether the opening degree of the expansion valve reaches a reference opening degree and whether the frequency of the compressor reaches the first target frequency.
In a preferable embodiment of the control system for an air conditioner under the high-humidity heating condition, the second control module sequentially increases the frequency of the compressor in stages at a plurality of set speeds in the following manner:
the second control module enables the compressor to carry out frequency increasing according to a 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 second control module enables the compressor to carry out frequency boosting according to a second frequency boosting 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.
In the preferable technical scheme of the control system of the air conditioner under the high-humidity heating working condition,
the acquisition module is also 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 opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the second 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 the 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, the method for controlling the air conditioner under the high humidity heating condition includes: acquiring the environmental humidity; when the ambient humidity is higher than the set humidity, the opening degree of an expansion valve of the air conditioner is quickly adjusted to a first target opening degree, and preferably the opening degree of the expansion valve is firstly reduced to a reference opening degree and then is increased to the first target opening degree from the reference opening degree; starting the compressor when the opening degree of the expansion valve is adjusted to the reference opening degree; continuously increasing the frequency of the compressor in stages according to a plurality of set 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. 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 rapid heating, improving the comfort of the air conditioner and improving the user experience. And through obtaining ambient humidity before the compressor starts to let the expansion valve aperture reduce to benchmark aperture earlier when ambient humidity is greater than the settlement humidity, can make the expansion valve aperture match with the compressor when the compressor starts, avoid the expansion valve along with the compressor start and the not good condition of expansion valve aperture and compressor matching degree that leads to appear, further improve the heating effect after the compressor starts.
Specifically, when the ambient humidity is greater than the set humidity, the opening degree of the expansion valve is reduced to a reference opening degree, the compressor is started when the expansion valve reaches the reference opening degree, the compressor is firstly boosted at a first boosting speed after the compressor is started, the compressor is boosted at a second boosting speed when the frequency of the compressor reaches a transition frequency, and the compressor is stopped from 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 environmental humidity is higher than the set humidity, the opening of the expansion valve is quickly reduced to the reference opening, and when the expansion valve quickly reaches the reference opening, the compressor is subjected to frequency boosting in two or more stages at the frequency boosting speed of first quick and then slow.
Drawings
The control method and system of the air conditioner under high humidity heating condition according to the present invention will be described with reference to the accompanying drawings in conjunction with the air conditioner operating in heating mode. In the drawings:
FIG. 1 is a schematic flow chart of a control method of an air conditioner under a high-humidity heating condition according to the present invention;
FIG. 2 is a schematic diagram illustrating the control method of the air conditioner under the high humidity heating condition according to the present invention compared with the prior art frequency increasing process;
fig. 3 is a schematic diagram of control logic of the compressor, the external fan and the expansion valve when the environmental humidity is greater than 60% according to the control method of the air conditioner under the high-humidity heating working condition.
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 schematic flow chart of a control method of an air conditioner under a high-humidity heating condition according to the present invention.
As shown in fig. 1, in order to solve the problem of poor rapid heating effect caused by long frequency-raising time in the starting up frequency-raising control method of the existing air conditioner, the invention provides a control method of an air conditioner under a high-humidity heating working condition, which mainly comprises the following steps:
s100, acquiring environment humidity, namely, after a user presses a starting switch of an air conditioner to start the air conditioner and selects a heating mode, acquiring the environment humidity by the air conditioner through a hygrometer or a humidity sensor and the like, wherein the environment humidity can refer to the relative humidity of an outdoor environment;
s200, when the ambient humidity is greater than the set humidity, starting an external fan of the air conditioner, and increasing the speed to a first target rotating speed according to the set acceleration, for example, when the ambient humidity is greater than a certain relative humidity, starting the external fan according to the acceleration which is increased by 1000r/min per second, and reaching the first target rotating speed of 3000r/min in 3 seconds, preferably, the set humidity is 60%, and the first target rotating speed is the maximum working rotating speed of the external fan;
s300, 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, preferably, the expansion valve is reduced to a reference opening degree according to a valve closing speed from 480 steps at the same time of starting the outer fan, and then is increased to the first target opening degree according to a valve opening speed from the reference opening degree, 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, after the air conditioner is started, the opening degree of the expansion valve 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 the first target opening degree at a valve opening speed of, for example, 40P/s.
S400, starting a compressor of the air conditioner when the external fan and/or the expansion valve reach set conditions, such as starting the compressor of the air conditioner when 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, 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, wherein the process that the expansion valve is increased from the reference opening degree to the first target opening degree coincides with the process that the compressor is started, and the aim is to keep the opening degree of the expansion valve matched with the working frequency of the compressor at the moment;
s500, continuously increasing the frequency of the compressor in stages according to a plurality of set 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 continue increasing the frequency after the compressor operates to a certain frequency or operates for a period of time;
s600, 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;
s700, 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, in the control method of the air conditioner of the present invention, when the ambient humidity is greater than 60%, the external fan and the expansion valve are started at the same time before the compressor is started, and the compressor is started when the external fan reaches the maximum operating speed and the expansion valve reaches the reference opening degree, so that a good heat dissipation condition can be created for the compressor in advance, the outdoor unit frosting can be delayed, and the opening degree of the expansion valve is matched with the operating frequency of the compressor when the compressor is started, thereby avoiding the situations that the heat dissipation effect of the compressor is poor and the matching speed of the opening degree of the expansion valve and the compressor is too low due to the fact that. This is because when the air speed of the outdoor fan is high, the heat transfer coefficient of the heat exchanger in the outdoor unit is increased, the evaporation temperature of the refrigerant is increased, the temperature difference between the outdoor unit and the external environment is reduced, and the tendency of frosting of the outdoor unit is reduced. 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 heating effect of the started compressor is improved, and the aim of quickly heating 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 starts the outer fan in advance to radiate heat, simultaneously adjusts the opening degree of the expansion valve to the reference opening degree and controls 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 problems of poor rapid heating effect and easy frosting of an outdoor unit caused by long frequency rising time in the conventional starting frequency rising control method are 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. Similarly, the setting of the ambient humidity is not limited to 60%, and those skilled in the art can adjust the setting based on different climatic conditions in different regions, for example, the value can be increased appropriately in dry regions, the set humidity can be set to about 65%, the value can be decreased appropriately in wet regions, the set humidity can be set to about 55%, and the like.
The principles of the present invention are further explained with reference to fig. 2. Fig. 2 is a schematic diagram illustrating a frequency increasing process comparison between a compressor of the control method of the air conditioner under the high-humidity heating working condition and a 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 temperature 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 rapid heating cannot be well met.
With continued reference to FIG. 2, as a preferred embodiment of the present invention, the continuous up-conversion process of the compressor may be divided into two stages, wherein the first stage compressor operates 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, in the cooperative control method of the present invention, S500 may further include the steps of:
s510, enabling the compressor to perform frequency raising according to a first frequency raising speed, for example, enabling the compressor to perform frequency raising according to the frequency raising speed of 1.2Hz/S by a control system of an air conditioner;
s520, 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；
S530, 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 rapid heating 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 f1The frequency raising speed is changed, namely the frequency raising is carried out in two stages of the frequency raising speed which is fast first and slow later, so that the compressor is enabled to be at the first frequency raising 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, 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 the user on quick heating. 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:
s800, acquiring environmental parameters, such as current environmental temperature (such as indoor/outdoor temperature);
s900, when the environmental parameter reaches/approaches the target parameter, the compressor is reduced to a second target frequency, meanwhile, the rotating speed of the outer fan is reduced to the second target rotating speed, and the opening degree of the expansion valve is reduced to the second target opening degree.
The advantages of this arrangement are: after the air conditioner heats rapidly for a period of time, the indoor temperature rises correspondingly, when the indoor temperature reaches/approaches the temperature set by a user, the compressor does not need to work continuously 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 matched with the compressor naturally. At this time, the compressor is reduced to the rated working frequency or the working frequency more matched with the current outdoor 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 an environmental humidity (such as an outdoor humidity), a target humidity set by a user, and the like.
The invention also provides a control system of the air conditioner under the high-humidity heating working condition, which mainly comprises the following components:
the acquisition module is used for acquiring the environment humidity, and acquiring the relative humidity of the outdoor environment if the air conditioner is started to select a heating mode;
a first 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 (e.g., while) an external blower starts to increase a 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;
the second control module is used for starting the compressor when the outer 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 set speeds, and stopping increasing the frequency of the compressor when the frequency of the compressor reaches the first target frequency;
the third control module is used for starting an external fan of the air conditioner when the ambient humidity is greater than the set humidity and accelerating to a first target rotating speed according to the set acceleration, and for example, when the ambient humidity is greater than a certain relative humidity, the third control module accelerates the external fan to a maximum working rotating speed according to the set acceleration;
and the judging module is used for judging whether the environment humidity is greater than the set humidity, whether the outer fan speeds up to a first target rotating speed, whether the expansion valve reaches the reference opening degree and whether the compressor reaches the first target frequency.
The second control module enables the compressor to continuously increase frequency in stages according to a plurality of set speeds in the following mode:
the second control module enables the compressor to be at the first frequency increasing 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 frequency1The second control module enables the compressor to follow 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 acquisition module is also used for acquiring environmental parameters, such as outdoor/indoor temperature, outdoor/indoor humidity and the like in real time;
after the acquisition module acquires the environmental parameters, the judgment module is further used for judging whether the environmental parameters reach target parameters, such as target temperature of heating set by a user and the like;
the first 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 second control module is also used for reducing the frequency of the compressor to a second target frequency when the environmental parameter reaches the target parameter; the third 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; if the indoor temperature reaches the target temperature set by the user, the second control module enables the compressor to reduce the frequency to the rated working frequency, the first 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, and the third control module enables the rotating speed of the external fan to be reduced to the rated working rotating speed.
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 working principle of the air conditioner control method and system under high humidity heating condition of the present invention will be briefly explained with reference to fig. 3. Fig. 3 is a schematic diagram of control logic of the compressor, the external fan and the expansion valve when the environmental humidity is greater than 60% according to the control method of the air conditioner under the high-humidity heating working condition.
As shown in fig. 3, when the air conditioner is in the heating mode, the working process of the external fan, the expansion valve and the compressor may be as follows:
air conditioner is started to heat → outdoor relative humidity is obtained → when the outdoor relative humidity is more than 60%, the external fan is accelerated according to the 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' carry out a reduction of the rotation speed, the expansion valve is closed at a 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: acquiring outdoor relative humidity; when the relative humidity is more than 60%, starting the outer fan and accelerating to the maximum working speed according to the set acceleration; meanwhile, the expansion valve reduces the opening degree 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 is started by adjusting the expansion valve when the relative humidity is more than 60%, the compressor is started when the external fan reaches the maximum rotating speed and the expansion valve is reduced to the reference opening, the compressor is subjected to frequency raising in two stages of frequency raising speed division of high speed and low speed, and the opening of the expansion valve is increased to the first target opening.
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 under a high-humidity heating working condition is characterized by comprising the following steps:
acquiring the environmental humidity;
when the environment humidity is higher than the set humidity, adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree;
starting a compressor of the air conditioner in the process of adjusting the opening degree of the expansion valve to the first target opening degree;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
2. The control method of the air conditioner under the high-humidity heating working condition 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 for controlling an air conditioner under high-humidity heating conditions according to claim 2, wherein the step of adjusting the opening degree of the 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 for controlling an air conditioner under high-humidity heating conditions according to claim 3, wherein the step of starting a compressor of the air conditioner in the process of adjusting the opening degree of an expansion valve to the first target opening degree further comprises:
and starting the compressor when the expansion valve reaches the reference opening degree.
5. The method for controlling the air conditioner under the high-humidity heating condition as claimed in claim 2, wherein the step of "enabling the compressor to continuously increase the frequency in stages at a plurality of set 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 the air conditioner under the high-humidity heating working condition according to claim 5, wherein 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 opening degree is an expansion valve opening degree matched with the first target frequency; and/or the set humidity is 60%.
7. The control method of the air conditioner under the high-humidity heating working condition according to any one of claims 1 to 6, characterized by further comprising the following steps:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, reducing the frequency of the compressor to a second target frequency, and reducing the opening degree of the expansion valve to a second target opening degree;
the environment parameter is an environment temperature or the environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
8. A control system of an air conditioner under a high-humidity heating working condition is characterized by comprising:
the acquisition module is used for acquiring the environmental humidity;
a first control module configured to reduce an opening degree of an expansion valve of the air conditioner to a reference opening degree at a set valve closing speed when the ambient humidity is greater than a set humidity, and increase 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 second control module, configured to start a compressor of the air conditioner and to successively up-convert the compressor in stages at a plurality of set speeds when the opening degree of the expansion valve reaches the reference opening degree, and to stop up-convert the compressor when the frequency of the compressor reaches a first target frequency;
and the judging module is used for judging whether the environment humidity is greater than the set humidity, whether the opening degree of the expansion valve reaches the reference opening degree and whether the frequency of the compressor reaches the first target frequency.
9. The control system for the air conditioner under the high-humidity heating working condition according to claim 8, wherein the second control module is used for enabling the compressor to be continuously increased in a staged mode according to a plurality of set speeds according to the following mode:
the second control module enables the compressor to carry out frequency increasing according to a 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 second control module enables the compressor to carry out frequency boosting according to a second frequency boosting 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 the air conditioner under the high humidity heating condition as claimed in claim 8,
the acquisition module is also 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 opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the second 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 the environment humidity, and the target parameter is a target temperature or a target humidity correspondingly.
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| CN102147174A (en) * | 2011-03-24 | 2011-08-10 | 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 |
| CN102419041A (en) * | 2011-12-13 | 2012-04-18 | Tcl空调器(中山)有限公司 | Throttle opening degree control method for varied-frequency air-conditioner |
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Effective date of registration: 20200918 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. 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: 20201028 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 Zhijia 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. |