CN107702281B - Control method and system of air conditioner under low-temperature low-humidity heating working condition - Google Patents

Control method and system of air conditioner under low-temperature low-humidity heating working condition Download PDF

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CN107702281B
CN107702281B CN201710866381.5A CN201710866381A CN107702281B CN 107702281 B CN107702281 B CN 107702281B CN 201710866381 A CN201710866381 A CN 201710866381A CN 107702281 B CN107702281 B CN 107702281B
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frequency
compressor
target
air conditioner
humidity
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CN107702281A (en
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罗荣邦
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
Qingdao Haier Jiaozhou Air Conditioner Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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 low-humidity heating working condition. The invention aims to solve the problems of poor quick heating effect and poor lubricating effect of 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 not 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 at the same time, before or after the outer fan starts to increase the speed; and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds. The control method can greatly shorten the frequency rising time of the compressor while ensuring the normal oil return of the compressor, achieves the purposes of quickly heating and improving lubrication, improves the comfort of the air conditioner and improves the user experience.

Description

Control method and system of air conditioner under low-temperature low-humidity heating working condition
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 low-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 quick heating time after the air conditioner is started is increased, the quick heating effect 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 in winter, the lubricating oil in the compressor has a high viscosity, and the lubricating effect is poor.
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 prior art that the up-conversion time is long, which results in poor quick heating effect and poor lubricating effect of the compressor when the ambient temperature is low, the invention provides a control method of an air conditioner under the low-temperature low-humidity heating working condition, which comprises the following steps:
acquiring the ambient temperature and the ambient humidity;
when the environment temperature is lower than the set temperature and the environment humidity is not higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating 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 at the same time, before or after the outer fan starts to increase the 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 low-humidity heating working 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 technical solution of the control method of the air conditioner under the low-temperature low-humidity heating condition, the step of "starting the compressor of the air conditioner while, before, or after the speed of the external air blower starts to increase" further includes:
and starting a compressor of the air conditioner while the outer fan starts to increase the speed.
In a preferred embodiment of the method for controlling an air conditioner under the low-temperature low-humidity heating condition, "step of stepping and continuously increasing the frequency of the compressor according to 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 the preferable technical scheme of the control method of the air conditioner under the low-temperature low-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%; and/or the step of "warming up a compressor of the air conditioner" is performed by an electric heating manner.
In a preferable technical solution of the control method of the air conditioner under the low-temperature low-humidity heating working 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 low-temperature low-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 and low-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 not more than the set humidity;
the second control module is used for starting an external fan of the air conditioner and accelerating the speed 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 while the external fan starts to increase the speed, 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 a 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 not 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 low-temperature and low-humidity heating condition, the third control module sequentially increases the frequency of the compressor in stages according to 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 low-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 and low-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 not 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 outer fan starts to increase the 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. By the control method that the ambient temperature and the ambient humidity are obtained before the compressor is started, the compressor is preheated firstly when the ambient temperature is lower than the set temperature and the ambient humidity is not higher than the set humidity, and the compressor and the outer fan are started simultaneously after the preheating of the compressor is finished, 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 running stability of the compressor are improved; the compressor and the outer fan are started simultaneously, so that the compressor can be started immediately and the frequency of the compressor is increased when the environmental humidity is low, the step that the outer fan needs to be started for heat dissipation (to avoid rapid frosting) before the compressor is started is omitted, the frequency increasing time of the compressor is further shortened, and the heating effect of the compressor after the start is improved.
Specifically, when the ambient temperature is lower than the set temperature and the ambient humidity is not higher than the set humidity, the compressor is preheated, the compressor and the outer fan are started simultaneously after preheating is finished, the outer fan keeps at the rotating speed after reaching the maximum rotating speed, the compressor is started and then is subjected to frequency boosting according to a first frequency boosting speed, when the frequency of the compressor reaches a transition frequency, the compressor is subjected to frequency boosting according to a second frequency boosting speed, and when the frequency of the compressor reaches a first target frequency, the compressor stops frequency boosting. 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 not higher than the set humidity, the compressor is preheated for a period of time, then the compressor and the outer fan are started simultaneously, and the compressor is subjected to frequency raising in two or more stages with the frequency raising speed of first quick and then slow.
Drawings
The following describes a control method and system of an air conditioner under low-temperature low-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 low-humidity heating condition according to the present invention;
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 low humidity heating working condition according to the present invention and a compressor of the prior art;
fig. 3 is a control logic diagram of the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ and the ambient humidity is not more than 60% according to the control method of the air conditioner under the low-temperature low-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 low-humidity heating conditions according to the present invention.
As shown in fig. 1, in order to solve the problems of the prior art that the boosting time is long, which results in poor quick heating effect and poor lubricating effect of the compressor when the ambient temperature is low, the present invention provides a control method of an air conditioner under low temperature and low humidity heating conditions, 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 not 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, and further reducing the viscosity of lubricating oil in the compressor, wherein the set temperature is preferably 5 ℃ and the set humidity is preferably 60%;
s300, after the preheating of the compressor is finished, adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree, and if the ambient humidity is not more than a certain relative humidity, reducing the opening degree of the expansion valve from 480 steps to a reference opening degree according to a valve closing speed, and then increasing the opening degree of the expansion valve from the reference opening degree to the first target opening degree according to a valve opening speed, wherein the expansion valve is preferably 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 outer fan 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 a first target opening degree at a valve opening speed of, for example, 40P/s (e.g., 400 steps);
s400, in the process of adjusting the opening degree of the expansion valve to a first target opening degree, starting an outer fan of the air conditioner, accelerating to a first target rotating speed according to a set acceleration, preferably, when the opening degree of the expansion valve reaches a reference opening degree, starting the outer fan according to an acceleration which is increased by 1000r/min per second, and reaching the first target rotating speed of 3000r/min in 3 seconds, preferably, the first target rotating speed is the maximum working rotating speed of the outer fan;
s500, starting a compressor of the air conditioner at the same time, before or after the speed of the external fan starts to rise, preferably, starting the compressor of the air conditioner at the same time when the speed of the external fan starts to rise;
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 the control method of the air conditioner according to the present invention is a control method for preheating the compressor first when the ambient temperature is less than 5 ℃ and the ambient humidity is not more than 60%, so as to reduce the viscosity of the lubricating oil in the compressor, thereby improving the lubricating effect of the compressor during operation. The control method comprises the steps of starting the expansion valve before the compressor after preheating is finished, and starting the compressor and the outer fan at the same time when the expansion valve reaches the reference opening degree. The control method for continuously increasing the frequency of the compressor in stages at different frequency increasing speeds after the compressor is started can greatly shorten the frequency increasing time of the compressor, improve the heating effect of the compressor after the compressor is started and further achieve the purpose of quick heating. In other words, the method cancels the process of continuously running on the oil return frequency in the frequency increasing process of the compressor, and ensures that the compressor can quickly increase the frequency while ensuring the normal oil return of the compressor by preheating the compressor in advance, adjusting the opening degree of the expansion valve to the reference opening degree, simultaneously starting the compressor and the outer fan and controlling the frequency increasing speed of the compressor in the frequency increasing process of the compressor, thereby solving the problems of poor quick heating effect and poor lubricating effect caused by long frequency increasing time in the conventional 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 comparison between the frequency increasing process of the compressor of the control method of the air conditioner under the low-temperature low-humidity heating condition of the present invention and the frequency increasing process of the compressor of the prior art. In fig. 2, a solid line represents an up-conversion process of the compressor in the control method of the present invention, and a dotted line represents an up-conversion process of the compressor in the related art.
As shown in fig. 2, in the prior art, a fixed frequency-increasing speed V (e.g. 1Hz/s) is generally adopted for frequency-increasing after the compressor is started, and a first oil-returning frequency f is set during the frequency-increasing process to ensure normal oil-returning of the compressor1And a second oil return frequency f2When the compressor is raised to the first oil return frequency f1When the frequency of the compressor is increased, the frequency of the compressor is increased at the frequency increasing speed V, and the frequency of the compressor is increased at the frequency increasing speed V. Likewise, the frequency of the compressor is increased to a second oil return frequency f2And maintaining the frequency for a period of time to ensure that the compressor continues to increase the frequency after stable oil return until the compressor reaches the maximum frequency fmaxAnd then stopping the frequency raising. As described in the background, such an up-conversion is due to the first oil return frequency f1And a second oil return frequency f2The 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 speed can be set to 1.2Hz/s, secondThe two ramp rates were 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 control method has the advantages that: 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 control method for changing the raising frequency speed, i.e. raising frequency in two stages with the raising frequency speed being fast first and slow second, makes the compressor at the first raising frequency speed V1At the time of frequency increase, the speed/rate of the lubricant oil discharged from the compressor reaches or exceeds the oil return speed/rate of the oil return capillary tube, and the lubricant oil in the compressor is gradually reduced. When the transition frequency f is reached1While the compressor is switched to follow the second raising speed V2The frequency is increased, wherein the lubricant discharged from the compressor is greatly reduced and the speed/velocity of the lubricant discharged from the compressor is increasedIs less than the oil return speed/speed of the oil return capillary tube, and the lubricating oil quantity in the compressor is 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 control method 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 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 raising 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 and low-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 not higher than the set humidity, and if the ambient temperature is lower than 5 ℃ and the ambient humidity is not 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 external fan of the air conditioner when the opening degree of the expansion valve reaches the reference opening degree and accelerating to a first target rotating speed according to the set acceleration;
the third control module is used for starting the compressor while the external fan starts to increase the speed, 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 fourth control module is used for reducing the opening degree of an expansion valve of the air conditioner to a reference opening degree according to a set valve closing speed after the preheating of the compressor is finished, and increasing the opening degree of the expansion valve to a first target opening degree according to a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
and the judging module is used for judging whether the ambient temperature is less than the set temperature, whether the ambient humidity is not greater than the set humidity, whether the expansion valve reaches the reference opening degree, whether the outer fan is accelerated to a first target rotating speed and whether the compressor reaches a 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 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 and outdoor/indoor humidity and the like, by adopting a temperature/humidity sensor 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 low temperature and low humidity heating working condition of the present invention will be briefly described with reference to fig. 3. Fig. 3 is a control logic diagram of the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ and the ambient humidity is not more than 60% according to the control method of the air conditioner under the low-temperature low-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 and the expansion valve compressor may be as follows:
air conditioner is started to heat → outdoor temperature and relative humidity are obtained → when the outdoor temperature is less than 5 ℃ and the relative humidity is not more than 60%, 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 expansion valve is closed at a valve closing speed V21' Slave opening degree B1' Start to subtractSmall aperture → meridian T1After the time interval, the opening degree of the expansion valve reaches a reference opening degree B'2The compressor and the external fan are started simultaneously, and the expansion valve is opened at a valve speed V22' increase the opening degree. Wherein the compressor is driven at an up-conversion speed V11' Up-frequency, external fan according to acceleration a1Increasing the speed and reaching the maximum operating speed n1Running at the maximum working speed → through 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 T3The compressor frequency reaches the maximum operating frequency f after a time interval2' and stop raising the frequency, the opening degree of the expansion valve reaches and f2' matched B3' and is stabilized at this opening → Trans 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 n1' and maintained at this frequency, the expansion valve opening is reduced to3'matched 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 not more than 60%; after the preheating of the compressor is finished, the expansion valve is reduced to a reference opening degree according to the set valve closing speed; when the opening degree of the expansion valve reaches a reference opening degree, the compressor and the outer fan are started simultaneously, the outer fan is accelerated to the maximum working rotation speed according to a set acceleration, the compressor is continuously accelerated according to a first frequency acceleration speed and a second frequency acceleration speed, and the expansion valve is increased to an opening degree matched with the frequency of the compressor 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 not more than 60%, the expansion valve is adjusted after the preheating of the compressor is finished, the compressor and the outer fan are started simultaneously when the opening of the expansion valve is reduced to the reference opening, the opening of the expansion valve is increased to the opening matched with the compressor, and the compressor is subjected to frequency raising in two stages of raising the frequency speed first and then slowly, so that the lubricating effect of the compressor can be improved by preheating the compressor, the opening of the expansion valve is matched with the compressor when the compressor is started, the compressor is quickly started, normal oil return of the compressor can be guaranteed by the change of the raising frequency speed of the compressor, the frequency can be raised to the maximum working frequency quickly, the compressor runs at the maximum working frequency, the requirement of quick heating of a user is met, and the user experience is greatly improved.
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 low-humidity heating is characterized by comprising the following steps:
acquiring the ambient temperature and the ambient humidity;
when the environment temperature is lower than the set temperature and the environment humidity is not higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating 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 at the same time, before or after the outer fan starts to increase the 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 while, before, or after the outer fan starts to increase the speed" further comprises:
starting a compressor of the air conditioner when the outer fan starts to increase the speed;
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 working condition of low temperature and low humidity heating according to claim 1, characterized by further comprising the following steps:
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 control method of the air conditioner under the low-temperature low-humidity heating condition as claimed in claim 2,
wherein the transition frequency is less than the first target frequency.
4. The control method of the air conditioner under the low-temperature low-humidity heating condition as claimed in claim 2,
the first target frequency is a maximum operating frequency of the compressor; and/or
The set temperature is 5 ℃; and/or
The set humidity is 60%; and/or
The step of "warming up a compressor of the air conditioner" is performed by an electric heating manner.
5. The control method of the air conditioner under the low-temperature low-humidity heating working condition according to any one of claims 1 to 4, characterized by further comprising the following steps:
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 as claimed in claim 5, wherein the environmental parameter is the environmental temperature or the environmental humidity, and the target parameter is a target temperature or a target humidity.
7. A control system of an air conditioner under low-temperature low-humidity heating working condition is characterized by comprising:
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 not more than the set humidity;
the second control module is used for starting an external fan of the air conditioner and accelerating the speed 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 while the external fan starts to increase the speed, 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 a first target frequency;
a judging module, configured to judge whether the ambient temperature is lower than the set temperature, whether the ambient humidity is not 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 low-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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