CN107576031B - Control method and system of air conditioner under low-temperature high-humidity heating working condition - Google Patents
Control method and system of air conditioner under low-temperature high-humidity heating working condition Download PDFInfo
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- CN107576031B CN107576031B CN201710866314.3A CN201710866314A CN107576031B CN 107576031 B CN107576031 B CN 107576031B CN 201710866314 A CN201710866314 A CN 201710866314A CN 107576031 B CN107576031 B CN 107576031B
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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 low-temperature high-humidity heating working condition. The invention aims to solve the problems of poor quick heating effect, poor lubricating effect and easy frosting of an outdoor unit in the starting up frequency-increasing control method of the conventional air conditioner. To this end, the control method of the present invention includes: acquiring the ambient temperature and the ambient humidity; when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating the compressor; after the preheating is finished, starting the outer fan and accelerating to a first target rotating speed; starting a compressor of the air conditioner when the outer fan reaches a first target rotating speed; and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds. The setting mode can greatly shorten the frequency rising time of the compressor while ensuring the normal oil return of the compressor, achieve the purposes of quickly heating, improving lubrication and delaying frosting, improve the comfort of the air conditioner and improve 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 low-temperature 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 in winter, the conventional air conditioner can generally make the compressor quickly increase 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. In addition, when the outdoor environment temperature is low and the humidity is high in winter, the lubricating oil viscosity in the compressor is high, the lubricating effect is poor, and the outdoor unit is prone to frosting.
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 problems of the conventional method for controlling the frequency rising of the air conditioner, such as poor quick heating effect due to long frequency rising time, poor lubricating effect of the compressor when the ambient temperature is low, and easy frosting of the outdoor unit when the ambient humidity is high, the present invention provides a method for controlling an air conditioner under the working conditions of low temperature and high humidity heating, which comprises the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the preheating of the compressor is finished, starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration;
starting a compressor of the air conditioner in the process that the outer fan is accelerated to the first target rotating speed;
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 low-temperature 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 preferable embodiment of the method for controlling an air conditioner under the low-temperature high-humidity heating condition, the step of "starting a compressor of the air conditioner in a process of increasing the speed of the external fan to the first target speed" further includes:
and when the outer fan reaches the first target rotating speed, starting a compressor of the air conditioner.
In a preferred embodiment of the method for controlling an air conditioner under the low-temperature 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 preferred technical scheme of the control method of the air conditioner under the low-temperature 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 rotating speed is the maximum working rotating speed of the outer fan; and/or the set temperature is 5 ℃; and/or the set humidity is 60%.
In a preferable technical solution of the control method of the air conditioner under the low-temperature high-humidity heating condition, the control method further includes:
acquiring an environmental parameter;
and when the environmental parameter reaches a target parameter, reducing the frequency of the compressor to a second target frequency, and reducing the rotating speed of the outer fan to a second target rotating speed.
In a preferred technical solution of the control method of the air conditioner under the above-mentioned low-temperature high-humidity heating condition, the environmental parameter is the environmental temperature or the environmental humidity, and the target parameter is correspondingly a target temperature or a target humidity.
The invention also provides a control system of the air conditioner under the working condition of low-temperature high-humidity heating, which comprises the following components:
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the first control module is used for preheating a compressor of the air conditioner when the ambient temperature is less than a set temperature and the ambient humidity is greater than a set humidity;
the second 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 after the preheating of the compressor is finished;
the third control module is used for starting a compressor of the air conditioner when the speed of the external fan is increased to the first target rotating speed, enabling the compressor to continuously increase the frequency in stages according to a plurality of set speeds, and enabling the compressor to stop increasing the frequency when the frequency of the compressor reaches the first target frequency;
and the judging module is used for judging whether the environment temperature is less than the set temperature, whether the environment humidity is greater than the set humidity, whether the outer fan speeds up to the first target rotating speed and whether the compressor frequency reaches the first target frequency.
In a preferred embodiment of the control system for an air conditioner under the above-mentioned low-temperature high-humidity heating condition, the third control module is configured to continuously frequency-increase the compressor in stages at a plurality of set 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.
In the preferable technical scheme of the control system of the air conditioner under the low-temperature 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 second 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 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 the environment temperature or the environment humidity, and the target parameter is correspondingly a target temperature or a target humidity.
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 low-temperature high-humidity heating condition includes: acquiring the ambient temperature and the ambient humidity; when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner; after the preheating of the compressor is finished, starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration; starting a compressor of the air conditioner when the speed of the external fan is increased to a first target rotating speed; 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. The compressor is started by acquiring the ambient temperature and the ambient humidity before the compressor is started, and when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, the compressor is preheated first, and the outer fan is started and reaches the first target rotating speed before the preheating and the frequency-increasing operation of the compressor are finished, so that good working conditions can be created for the compressor in advance, namely the viscosity of lubricating oil of the compressor can be reduced by preheating the compressor, and the lubricating effect and the operation stability of the compressor are improved. The outer fan drives the air flow with high rotational speed and dispels the heat for the compressor, just can possess good heat dissipation condition when making the compressor start, can also delay the frosting simultaneously, avoids outer fan to start the condition appearance that the compressor radiating effect that leads to is not good or the off-premises station frosts easily along with the compressor then together, improves the heating effect after the compressor starts.
Specifically, when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, the compressor is preheated firstly, the outer fan is started immediately after the preheating is finished, the compressor is started when the outer fan reaches the maximum rotating speed, the frequency is increased according to a first frequency increasing speed after the compressor is started, the compressor is increased according to a second frequency increasing speed when the frequency of the compressor reaches a transition frequency, and the frequency increasing of the compressor is stopped 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 temperature is lower than the set temperature and the environmental humidity is higher than the set humidity, the compressor is preheated for a period of time, then the outer fan is started, and finally the compressor is subjected to frequency boosting in two or more stages at the frequency boosting speed of first high and second low when the outer fan reaches the maximum rotating speed.
Drawings
The following describes a control method and system of an air conditioner under low-temperature high-humidity heating conditions according to the present invention with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow chart of a control method of an air conditioner under a low-temperature high-humidity heating condition 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 under the low-temperature and high-humidity heating working condition of the present invention with that of the compressor of the prior art;
fig. 3 is a schematic diagram of control logic of the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ and the ambient humidity is greater than 60% in the control method of the air conditioner under the low-temperature 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 low-temperature high-humidity heating conditions according to the present invention.
As shown in fig. 1, in order to solve the problems of poor quick heating effect due to long frequency-increasing time, poor lubricating effect of a compressor when the ambient temperature is low, and easy frosting of an outdoor unit when the ambient humidity is high in the starting up frequency-increasing control method of the conventional air conditioner, the invention provides a control method of the air conditioner under the working conditions of low-temperature high-humidity heating, which mainly comprises the following steps:
s100, acquiring the ambient temperature and the ambient humidity, wherein the ambient temperature and the ambient humidity can be acquired by the air conditioner through a hygrothermograph or a temperature and humidity sensor and the like if a user presses a starting switch of the air conditioner to start the air conditioner and selects a heating mode;
s200, when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner for 1min by electrifying an electric heating belt arranged in the compressor or directly electrifying the compressor, so that the viscosity of lubricating oil in the compressor is reduced, preferably, the set temperature is 5 ℃ and the set humidity is 60%;
s300, after preheating of the compressor is finished, starting an outer fan of the air conditioner, accelerating to a first target rotating speed according to a set acceleration, for example, after the compressor is preheated for 1min, starting the outer fan according to the acceleration increased by 1000r/min per second, 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 outer fan;
s400, 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, 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).
S500, 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, 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;
s600, 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;
s700, 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;
and S800, when the frequency of the compressor reaches the first target frequency, stopping the frequency increasing of the compressor, and if the current frequency reaches the first target frequency, keeping the compressor 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 temperature is less than 5 ℃ and the ambient humidity is greater than 60%, the compressor is preheated first, so that the viscosity of the lubricating oil in the compressor can be reduced, and the lubricating effect of the compressor during operation can be further improved. After preheating is finished, the outer fan and the expansion valve are started before the compressor at the same time, and the compressor is started again when the outer fan reaches the maximum working 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, frosting of the outdoor unit is delayed, the opening degree of the expansion valve is matched with the working frequency of the compressor when the compressor is started, and the situations that the heat dissipation effect of the compressor is poor and the opening degree of the expansion valve is not matched with the compressor due to the fact that the outer fan is started together with the compressor are avoided. 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 invention cancels the process of continuous operation on oil return frequency in the frequency increasing process of the compressor, and adjusts the opening of the expansion valve to the reference opening while preheating the compressor in advance and opening the outer fan for heat dissipation in advance, and controls the frequency increasing speed of the compressor in the frequency increasing process of the compressor, thereby ensuring normal oil return of the compressor, and simultaneously completing quick frequency increasing of the compressor, solving the problems of poor quick heating effect, poor lubricating effect and easy frosting of the outdoor unit caused by long frequency increasing time in the existing starting frequency increasing control method, improving the comfort of the air conditioner and greatly improving the user experience.
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 temperature, the ambient humidity and the preheating time is not limited to 5 ℃, 60% and 1min, and those skilled in the art can adjust the setting temperature to 3 ℃ or 7 ℃, the setting humidity to 55% or 65%, the preheating time to 30s or 2min, etc. based on different climatic conditions of different regions.
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 low-temperature and high-humidity heating conditions and a compressor in 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 frequency up-conversion process of the compressor may be divided into two stages, wherein the first stage compressor converts the first up-conversion to a first up-conversionFrequency velocity 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, S600 may further include the following steps:
s610, enabling the compressor to be at the 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;
s620, 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；
S630, 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 f1Changing the raising frequency speed, i.e. setting the raising frequency in two stages of raising frequency speed first and then slowlySo that the compressor is at a first up-conversion 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 V2And increasing the frequency, greatly reducing the lubricating oil discharged from the compressor at the moment, wherein the speed/speed of the lubricating oil discharged from the compressor is less than the oil return speed/speed of the oil return capillary tube, and further ensuring the lubricating oil quantity in the compressor. 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:
s900, acquiring environmental parameters, such as current environmental temperature (such as indoor temperature);
s1000, 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 speed or the working 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 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 purpose of heating rapidly is achieved, 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 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 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 working condition of low-temperature high-humidity heating, which mainly comprises the following components:
the acquisition module is used for acquiring the ambient temperature and the ambient humidity, and acquiring the temperature and the relative humidity of the outdoor environment if the heating mode is selected when the air conditioner is started;
the first control module is used for preheating a compressor of the air conditioner when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, and if the ambient temperature is lower than 5 ℃ and the ambient humidity is higher than 60%, the first control module enables an electric heating belt arranged on the compressor to be electrified for 1min and then to be powered off;
the second control module is used for starting an outer fan of the air conditioner after the preheating of the compressor is finished, and accelerating to a first target rotating speed according to a set acceleration, and after the electric heating belt is powered off, the second control module accelerates the outer fan to a maximum working rotating speed according to the set acceleration;
the third control module is used for starting the compressor when the speed of the external fan is increased to 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;
a fourth 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 at the same time, before or after (e.g., at the same time) when the speed of the external air blower starts to increase, 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;
and the judging module is used for judging whether the ambient temperature is less than the set temperature, whether the ambient humidity is greater than the set humidity, whether the speed of the external fan is increased 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 third control module enables the compressor to continuously increase the frequency in stages according to a plurality of set speeds in the following mode:
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 ofFrequency 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 second 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 third 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 fourth 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; if the indoor temperature reaches the target temperature set by the user, the second control module enables the rotating speed of the outer fan to be reduced to the rated working rotating speed, the third control module enables the compressor to be reduced to the rated working frequency, and the fourth 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, the fourth control module and the judgment module can be independent from each other, and of course, the physical forms can also be functional units integrated into 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, the fourth control module and the judgment module.
The working principle of the air conditioner control method and system under the low-temperature high-humidity heating condition of the invention is briefly described 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 ambient temperature is less than 5 ℃ and the ambient humidity is greater than 60% in the control method of the air conditioner under the low-temperature 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 → the outdoor temperature and relative humidity are obtained → when the outdoor temperature is less than 5 ℃ and the relative humidity is more than 60 percent, the electric heating belt of the compressor is enabled to be in accordance with the voltage U1' Power on → Via T0After a time interval, the electric heating belt is powered off, and 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 T2The compressor frequency reaches the transition frequency f after a time interval1At 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 T5After a time interval the compressor frequency is reduced to the nominal operating frequency f3'and maintained at this frequency while the outer fan speed is reduced to the rated operating 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 temperature and relative humidity; preheating a compressor when the outdoor temperature is less than 5 ℃ and the relative humidity is more than 60%; after the preheating of the compressor is finished, starting the 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 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 fourth control module, a judgment module and a collection module. The compressor is preheated when the outdoor temperature is less than 5 ℃ and the relative humidity is more than 60 percent, the outer fan is started after the preheating of the compressor is finished, and the expansion valve is adjusted at the same time, starting the compressor when the external fan reaches the maximum rotating speed and the opening degree of the expansion valve is reduced to the reference opening degree, and increasing the frequency of the compressor in two stages with the increasing frequency speed of first-speed and second-speed, and at the same time, the expansion valve is increased to the first target opening, so that the invention can improve the lubricating effect of the compressor by preheating the compressor, good working conditions are created in advance through the external fan and the expansion valve, frosting is delayed, normal oil return of the compressor is ensured through the change of the frequency rising speed of the compressor, meanwhile, the frequency can be quickly raised to the maximum working frequency, and then with the maximum operating frequency operation, satisfy the demand that the user heated fast, promote user experience greatly.
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 (8)
1. A control method of an air conditioner under the working condition of low-temperature high-humidity heating is characterized by comprising the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the preheating of the compressor is finished, starting an external fan of the air conditioner, and accelerating to a first target rotating speed according to a set acceleration;
starting a compressor of the air conditioner in the process that the outer fan is accelerated to the first target rotating speed;
continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds;
wherein the step of "starting the compressor of the air conditioner in the process of increasing the speed of the external air blower to the first target speed" further comprises:
when the outer fan reaches the first target rotating speed, starting a compressor of the air conditioner;
wherein the step of "causing the compressor to continuously frequency up 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 first up-conversion speed is greater than the second up-conversion speed; the first target rotating speed is the maximum working rotating speed of the outer fan.
2. The control method of the air conditioner under the low-temperature high-humidity heating working condition according to claim 1, further comprising the following steps of:
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 the air conditioner under the low-temperature high-humidity heating working condition according to claim 2, wherein the transition frequency is less than the first target frequency.
4. The method for controlling the air conditioner under the low-temperature high-humidity heating working condition according to claim 2, wherein the first target frequency is a maximum working frequency of the compressor; and/or the set temperature is 5 ℃; and/or the set humidity is 60%.
5. The control method for the air conditioner under the low-temperature high-humidity heating working condition according to any one of claims 1 to 4, characterized by further comprising the following steps of:
acquiring an environmental parameter;
and when the environmental parameter reaches a target parameter, reducing the frequency of the compressor to a second target frequency, and reducing the rotating speed of the outer fan to a second target rotating speed.
6. The method for controlling the air conditioner under the low-temperature high-humidity heating working condition according to claim 5, wherein the environmental parameter is the environmental temperature or the environmental humidity, and the target parameter is correspondingly a target temperature or a target humidity.
7. A control system of air conditioner under low temperature and high humidity heating working condition is characterized in that the control system comprises:
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the first control module is used for preheating a compressor of the air conditioner when the ambient temperature is less than a set temperature and the ambient humidity is greater than a set humidity;
the second 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 after the preheating of the compressor is finished;
the third control module is used for starting a compressor of the air conditioner when the speed of the external fan is increased to the first target rotating speed, enabling the compressor to continuously increase the frequency in stages according to a plurality of set speeds, and enabling the compressor to stop increasing the frequency when the frequency of the compressor reaches the first target frequency;
a judging module, configured to judge whether the ambient temperature is lower than the set temperature, whether the ambient humidity is higher than the set humidity, whether the external fan is accelerated to the first target rotation speed, and whether the compressor frequency reaches the first target frequency;
the third control module steps the compressor up continuously at a plurality of set 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; the first frequency increasing speed is greater than the second frequency increasing speed; the first target rotating speed is the maximum working rotating speed of the outer fan.
8. The control system of the air conditioner under the low-temperature high-humidity heating condition as claimed in claim 7,
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 second 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 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 the environment temperature or the environment humidity, and the target parameter is correspondingly a target temperature or a target humidity.
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| CN110810966B (en) * | 2018-08-10 | 2022-06-28 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
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| CN110811029B (en) * | 2018-08-10 | 2022-07-19 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810991B (en) * | 2018-08-10 | 2022-06-14 | 青岛海尔空调器有限总公司 | Control method of heat pump type air conditioning clothes |
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| CN110810992B (en) * | 2018-08-10 | 2022-07-05 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810969B (en) * | 2018-08-10 | 2022-07-05 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810993B (en) * | 2018-08-10 | 2022-06-14 | 青岛海尔空调器有限总公司 | Control method of heat pump type air conditioning clothes |
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| CN110811028B (en) * | 2018-08-10 | 2022-07-19 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810967B (en) * | 2018-08-10 | 2022-06-14 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810998B (en) * | 2018-08-10 | 2022-07-19 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810996B (en) * | 2018-08-10 | 2022-06-14 | 青岛海尔空调器有限总公司 | Control method of heat pump type air conditioning clothes |
| CN110810994B (en) * | 2018-08-10 | 2022-06-14 | 青岛海尔空调器有限总公司 | Control method of heat pump type air conditioning clothes |
| CN110811032B (en) * | 2018-08-10 | 2022-06-14 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN110810968B (en) * | 2018-08-10 | 2022-06-14 | 重庆海尔空调器有限公司 | Control method of heat pump type air conditioning clothes |
| CN109579235B (en) * | 2018-11-30 | 2020-06-26 | 广东美的制冷设备有限公司 | Control method of air conditioner, control device of comfort mode and air conditioner |
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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: 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. |