CN107677005B - Control method and system of air conditioner under low-temperature heating working condition - Google Patents
Control method and system of air conditioner under low-temperature heating working condition Download PDFInfo
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- CN107677005B CN107677005B CN201710866378.3A CN201710866378A CN107677005B CN 107677005 B CN107677005 B CN 107677005B CN 201710866378 A CN201710866378 A CN 201710866378A CN 107677005 B CN107677005 B CN 107677005B
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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 heating working condition. The invention aims to solve the problems of poor quick heating effect and poor lubricating effect of the existing air conditioner. To this end, the control method of the present invention includes: acquiring an ambient temperature; when the ambient temperature is lower than the set temperature, preheating the compressor; after the preheating is finished, starting the outer fan, and accelerating to a first target rotating speed; adjusting the opening degree of the expansion valve to a first target opening degree at the same time, before or after the outer fan starts to increase the speed; starting the compressor when the external fan and/or the expansion valve reach the set conditions; and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds. The method can greatly shorten the frequency rising time of the compressor, achieve the purposes of quickly heating and improving lubrication, 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 heating working condition.
Background
With the increasing living standard, the requirements of people on the quality of life are higher and higher, and the requirements are particularly obvious on household appliances. Taking an air conditioner as an example, in order to meet the requirement of a user for quick heating and bring more comfortable use experience, the existing air conditioner can generally make the compressor quickly increase the frequency to a higher frequency for operation when the air conditioner is just started. When the compressor is operated, refrigerant in the compressor is rapidly discharged to circulate in the pipe system. In the circulation process, the lubricating oil is discharged out of the compressor along with the refrigerant and enters the pipeline, and the dynamic balance of the lubricating oil in the whole system can be maintained only if the discharged part of the lubricating oil smoothly returns to the compressor (namely, oil return), otherwise, the compressor is damaged due to oil shortage. Most of air conditioners in the market at present adopt an arrangement mode of combining an oil separator and an oil return capillary tube, and lubricating oil discharged from a compressor is separated out through the oil separator and then returns to the compressor through the oil return capillary tube. However, in the case of the inverter air conditioner, as the operating frequency of the compressor increases, the discharge speed/velocity of the lubricating oil becomes faster and faster, and when the discharge speed/velocity of the lubricating oil exceeds the maximum oil return speed/velocity of the oil return capillary tube, the oil shortage phenomenon is easily generated. Therefore, in order to ensure normal oil return, during the process of rapidly raising the frequency of the compressor to a high frequency, the compressor is usually forced to operate for a period of time at a certain fixed frequency (oil return frequency), and the frequency raising is continued after the oil return is stable.
Although normal oil return is guaranteed by the arrangement mode, the compressor is forced to continuously run for a period of time on the oil return frequency, so that the frequency rising time of the compressor is too long in the process of quick heating of the air conditioner during starting, the speed of the compressor reaching the maximum working frequency is slowed down, the time for quick heating after the air conditioner is started is increased, the effect of quick heating of the air conditioner is influenced, and poor use experience is brought to a user. That is, the conventional method for controlling the frequency rise of the air conditioner during starting has the problem of poor quick heating effect due to long frequency rise time. In addition, when the outdoor environment temperature is low in winter, the lubricating oil in the compressor has 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 present invention provides a control method of an air conditioner under low temperature heating condition, which comprises the following steps:
acquiring an ambient temperature;
when the ambient temperature is lower than the set temperature, 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;
adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed;
when the external fan and/or the expansion valve reach set conditions, starting a compressor of the air conditioner;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
In a preferred technical solution of the control method of the air conditioner under the low-temperature 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 embodiment of the method for controlling an air conditioner under the low-temperature heating condition, the step of adjusting an opening degree of an expansion valve of the air conditioner to a first target opening degree further includes:
reducing the opening degree of the expansion valve to a reference opening degree according to a set valve closing speed;
when the expansion valve opening degree reaches the reference opening degree, the expansion valve opening degree is increased to the first target opening degree at a set valve opening speed.
In the above preferred technical solution of the control method for an air conditioner under a low-temperature heating condition, the step of "starting a compressor of the air conditioner when the external fan and/or the expansion valve reaches a set condition" further includes:
and when the outer fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, starting a compressor of the air conditioner.
In a preferred embodiment of the method for controlling an air conditioner under the low-temperature 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 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 first target opening degree is an expansion valve opening degree matched with the first target frequency; and/or
The set temperature is 5 ℃; and/or
The step of "warming up a compressor of the air conditioner" is performed by an electric heating manner.
In a preferred technical solution of the control method of the air conditioner under the low-temperature heating working condition, the control method further includes:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency; and is
Reducing the rotating speed of the outer fan to a second target rotating speed; and is
Decreasing the expansion valve opening to a second target opening;
the environment parameter is the environment temperature or the environment 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 heating, which comprises the following components:
the acquisition module is used for acquiring the ambient temperature;
the first control module is used for preheating a compressor of the air conditioner when the ambient temperature is lower than a set temperature;
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;
a third 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 as, before, or after the external air blower starts to increase the speed, and increasing the opening degree of the expansion valve to a first target opening degree at a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
a fourth control module for starting a compressor of the air conditioner and sequentially increasing the frequency of the compressor in stages at a plurality of set speeds when the external fan reaches the first target rotational speed and/or the expansion valve reaches the reference opening degree, and stopping the frequency increase of the compressor 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 outer fan speeds up to the first target rotating speed, whether the opening degree of the expansion valve reaches the reference opening degree and whether the frequency of the compressor reaches the first target frequency.
In a preferred embodiment of the control system for an air conditioner under the low-temperature heating condition, the fourth control module sequentially increases the frequency of the compressor in stages according to a plurality of set speeds in the following manner:
the fourth control module enables the compressor to carry out frequency increasing according to a first frequency increasing speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the fourth control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed;
wherein the transition frequency is less than the first target frequency; and/or the first up-conversion speed is greater than the second up-conversion speed.
In the preferable technical scheme of the control system of the air conditioner under the low-temperature 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 used for reducing the opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the fourth 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, a method for controlling an air conditioner in a low-temperature heating mode includes: acquiring an ambient temperature; when the ambient temperature is lower than the set temperature, 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; adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed; when the external fan and/or the expansion valve reach the set conditions, starting the compressor of the air conditioner; continuously increasing the frequency of the compressor in stages according to a plurality of frequency increasing speeds; judging whether the frequency of the compressor reaches a first target frequency or not; and stopping the frequency increasing of the compressor when the frequency of the compressor reaches the first target frequency. Preferably, the compressor of the air conditioner is started when the external fan reaches the first target rotation speed and the expansion valve reaches the reference opening degree.
By canceling the continuous operation stage on the oil return frequency in the frequency increasing process of the compressor and continuously increasing the frequency of the compressor in stages at different frequency increasing speeds after the compressor is started, the invention can greatly shorten the frequency increasing time of the compressor, thereby achieving the purpose of rapid heating, improving the comfort of the air conditioner and improving the user experience. The environment temperature is obtained before the compressor is started, the compressor is preheated firstly when the environment temperature is lower than the set temperature, the outer fan is enabled to reach the first target rotating speed firstly before the preheating of the compressor is finished and the frequency increasing operation is carried out, and the opening degree of the expansion valve is reduced to the reference opening degree, 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, the lubricating effect and the operation stability of the compressor are improved, the outer fan drives air to flow at a high rotating speed to dissipate heat of the compressor, and the opening degree of the expansion valve is matched with the compressor when the compressor is started, so that the compressor has good heat dissipation conditions and matched opening degree of the expansion valve before the compressor is started, and the situations that the heat dissipation effect of the compressor is poor and the matching degree of the opening degree of the expansion valve and the compressor are poor due to the fact, the heating effect after the compressor is started is rapidly improved.
Specifically, the compressor is preheated firstly when the ambient temperature is lower than the set temperature, the outer fan reaches the maximum rotating speed and the expansion valve is reduced to the reference opening degree immediately after the preheating is finished, the compressor is started when the outer fan reaches the maximum rotating speed and the expansion valve reaches the reference opening degree, the compressor is firstly boosted according to a first boosting speed after the compressor is started, the compressor is boosted according to a second boosting speed when the frequency of the compressor reaches the transition frequency, and the compressor stops boosting when the frequency of the compressor reaches the 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, the compressor is preheated for a period of time, then the outer fan reaches the maximum rotating speed and the opening degree of the expansion valve is rapidly reduced to the reference opening degree, and finally the compressor is subjected to frequency raising in two or more stages at the frequency raising speed of first high and second low when the outer fan reaches the maximum rotating speed and the expansion valve reaches the reference opening degree.
Drawings
The present invention relates to a method and system for controlling an air conditioner in a low temperature heating mode. In the drawings:
FIG. 1 is a schematic flow chart of a control method of an air conditioner under a low-temperature heating condition according to the present invention;
FIG. 2 is a schematic diagram illustrating a frequency increasing process of a compressor according to the control method of an air conditioner under a low temperature heating condition of the present invention compared with a prior art compressor;
fig. 3 is a schematic view showing control logics of the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ in the control method of the air conditioner under the low-temperature heating working condition according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present invention is described in connection with an embodiment in which the compressor is provided with two frequency-increasing stages, the arrangement is not always the same, and those skilled in the art can apply the method of the present invention to other application scenarios without departing from the principle of the present invention, for example, the compressor may be provided with three or more frequency-increasing stages.
Referring to fig. 1, fig. 1 is a schematic flow chart of a control method of an air conditioner under a low-temperature heating condition according to the present invention.
As shown in fig. 1, in order to solve the problems of the prior method for controlling the start-up frequency boost of the air conditioner that the quick heating effect is poor due to the long frequency boost time and the lubricating effect of the compressor is poor when the ambient temperature is low, the invention provides a method for controlling the air conditioner under the working condition of low-temperature heating, which mainly comprises the following steps:
s100, acquiring an ambient temperature, wherein the ambient temperature can refer to the temperature of an outdoor environment, if a user presses a starting switch of an air conditioner to start the air conditioner and selects a heating mode, the air conditioner acquires the ambient temperature through a thermometer or a temperature sensor;
s200, when the ambient temperature is lower than a set temperature, preheating a compressor of the air conditioner, and if the ambient temperature is lower than a certain set value, preheating the compressor 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, wherein the set temperature is preferably 5 ℃;
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, preferably, starting the compressor of the air conditioner when the external fan reaches a first target rotating speed and the expansion valve reaches a reference opening degree;
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 can reduce the viscosity of the lubricating oil in the compressor by the control method of preheating the compressor first when the ambient temperature is less than 5 ℃, so as to improve the lubricating effect of the compressor during operation. After preheating is finished, the outer fan and the expansion valve are started before the compressor, 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, and the conditions that the heat dissipation effect of the compressor is poor and the opening degree of the expansion valve is not matched due to the fact that the outer fan and the expansion valve are started together with the compressor are avoided. 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 purpose of rapid heating is achieved. In other words, the invention cancels the process of continuous operation on the 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 in advance for heat dissipation and controls the frequency increasing speed of the compressor, thereby ensuring the normal oil return of the compressor, completing the rapid frequency increasing of the compressor, solving the problems of poor rapid heating effect and poor lubricating effect 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 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 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 a low-temperature heating condition according to the present invention and a compressor of the prior art. In fig. 2, a solid line represents an up-conversion process of the compressor in the control method of the present invention, and a dotted line represents an up-conversion process of the compressor in the related art.
As shown in fig. 2, in the prior art, a fixed frequency-increasing speed V (e.g. 1Hz/s) is generally adopted for frequency-increasing after the compressor is started, and a first oil-returning frequency f is set during the frequency-increasing process to ensure normal oil-returning of the compressor1And a second oil return frequency f2When the compressor is raised to the first oil return frequency f1When the frequency of the compressor is increased, the frequency of the compressor is increased at the frequency increasing speed V, and the frequency of the compressor is increased at the frequency increasing speed V. In the same way, in the compressorRaising the frequency to a second oil return frequency f2And maintaining the frequency for a period of time to ensure that the compressor continues to increase the frequency after stable oil return until the compressor reaches the maximum frequency fmaxAnd then stopping the frequency raising. As described in the background, such an up-conversion is due to the first oil return frequency f1And a second oil return frequency f2The temperature is maintained for a period of time, so the frequency rising speed of the compressor is seriously influenced, and although the stable oil return of the compressor is ensured, the requirement of rapid heating cannot be well met.
With continued reference to FIG. 2, as a preferred embodiment of the present invention, the continuous up-conversion process of the compressor may be divided into two stages, wherein the first stage compressor operates at a first up-conversion speed V1And performing frequency raising, and entering a second stage when the frequency is raised to the transition frequency. The second stage compressor at a second raising speed V2And performing frequency raising, and stopping frequency raising when the frequency is raised to the first target frequency. Preferably, the transition frequency may be set to the first oil return frequency f1. First raising frequency speed V1Greater than the second up-conversion speed V2For example, the first up-conversion rate may be set to 1.2Hz/s and the second up-conversion rate may be set to 0.5 Hz/s.
That is 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 f1The frequency raising speed is changed, namely the frequency raising is carried out in two stages of the frequency raising speed which is fast first and slow later, so that the compressor is enabled to be at the first frequency raising speed V1At the time of frequency increase, the speed/rate of the lubricant oil discharged from the compressor reaches or exceeds the oil return speed/rate of the oil return capillary tube, and the lubricant oil in the compressor is gradually reduced. When the transition frequency f is reached1While the compressor is switched to follow the second raising speed V2The frequency is increased, the lubricating oil flowing out of the compressor is greatly reduced, the speed/speed of the lubricating oil discharged out of the compressor is smaller than the oil return speed/speed of the oil return capillary tube, and the lubricating oil quantity in the compressor is further ensured. That is, the invention can ensure the normal oil return of the compressor through the change of the frequency raising speed, and simultaneously correspondingly accelerate the frequency raising speed of the compressor by canceling the control mode of the continuous operation stage on the oil return frequency, so that the compressor can be raised to the maximum working frequency more quickly, and then the compressor can be operated at the maximum working frequency, thereby meeting the requirement of the user on quick heating. As is apparent from fig. 2, through repeated experiments by the inventor, the time for the compressor of the present invention to reach the maximum operating frequency is significantly less than the time for the compressor of the prior art to reach the maximum operating frequency.
It should be noted that the above preferred setting manner and specific values are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can also make any type of adjustment on the above parameters without departing from the principle of the present invention, as long as the adjusted technical scheme can improve the condition of increasing the frequency raising speed on the premise of ensuring the normal oil return of the compressor. If the frequency raising stage can be further divided into three stages, each stage raises the frequency at different frequency raising speeds (such as fast and slow modes); the transition frequency can also float up and down according to the first oil return frequency; the first target frequency is not the maximum operating frequency of the compressor but a value close to the maximum operating frequency, etc.
In addition, in order to better improve the experience of the user using the air conditioner, when the compressor operates at the maximum operating frequency, the control method of the air conditioner of the present invention may further include the steps of:
s900, acquiring environmental parameters, such as current environmental temperature (such as indoor/outdoor 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 rotating speed or the working rotating speed matched with the compressor, and reducing the opening degree of the expansion valve to an opening degree matched with the current working frequency of the compressor.
The advantages of this arrangement are: after the air conditioner heats rapidly for a period of time, the indoor temperature rises correspondingly, when the indoor temperature of the ring 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 heating, which mainly comprises:
the acquisition module is used for acquiring the ambient temperature, and acquiring the temperature of the outdoor environment if the air conditioner is started to select the heating mode;
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 if the ambient temperature is lower than 5 ℃, 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;
a third control module for reducing an opening degree of an expansion valve of an air conditioner to a reference opening degree at a set valve-closing speed while, before, or after (e.g., while) the external air blower starts to increase the speed, and increasing the expansion valve to a first target opening degree at a set valve-opening speed when the opening degree of the expansion valve reaches the reference opening degree;
the four control modules are used for starting the compressor when the external fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, 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 ambient temperature is less than the set temperature, whether the outer fan reaches a first target rotating speed, whether the opening degree of the expansion valve reaches a reference opening degree and whether the compressor reaches a first target frequency.
The fourth control module enables the compressor to continuously increase the frequency in stages according to a plurality of set speeds in the following mode:
the fourth control module enables the compressor to be at the first frequency increasing speed V1Performing frequency boosting;
the judging module judges whether the frequency of the compressor reaches the transition frequency f1；
Reaching a transition frequency f at the compressor frequency1The fourth control module causes the compressor to operate at a second ramp-up speed V2Performing frequency boosting;
preferably, the first up-conversion speed V1Greater than the second up-conversion speed V2Transition frequency f1Less than a first target frequency, and the first target frequency is the maximum operating frequency f of the compressormaxThe first target opening degree is equal to the maximum working frequency fmaxMatched opening degree of the expansion valve.
In addition, the acquisition module is also used for acquiring environmental parameters, such as outdoor/indoor temperature, outdoor/indoor humidity and the like in real time;
after the acquisition module acquires the environmental parameters, the judgment module is further used for judging whether the environmental parameters reach target parameters, such as target temperature of heating set by a user and the like;
the 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 opening of the expansion valve to a second target opening when the environmental parameter reaches the target parameter; the fourth control module is further used for enabling the compressor to reduce the frequency to a second target frequency when the environmental parameter reaches the target parameter, and if the indoor temperature reaches the target temperature set by a user, the fourth control module firstly enables the compressor to reduce the frequency to the rated working frequency, then the second control module enables the rotating speed of the outer fan to be reduced to the rated working rotating speed, and the third 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 operation principle of the control method and system for air conditioner under low temperature heating condition of the present invention will be briefly described with reference to fig. 3. Fig. 3 is a schematic view showing control logics of the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ in the control method of the air conditioner under the low-temperature heating working condition according to the present invention.
As shown in fig. 3, when the air conditioner is in the heating mode, the working processes of the external fan, the expansion valve and the compressor may be:
starting air conditioner to heat → obtaining outdoor temperature → making electric heating belt of compressor according to voltage U when outdoor temperature is less than 5 deg.C1' 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 n1' the expansion valve reaches the reference opening degree B ' at the same time '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 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 T5Time intervalThe frequency of the rear compressor is reduced to the rated working 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; preheating the compressor at outdoor temperature of less than 5 deg.C; 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 rotating speed and the opening degree of the expansion valve reaches the reference opening degree, starting the compressor, continuously increasing the frequency according to a first frequency increasing speed and a second frequency increasing speed, and increasing the opening degree of the expansion valve according to a valve opening speed; judging whether the frequency of the compressor reaches the maximum working frequency or not; and stopping raising the frequency when the frequency of the compressor reaches the maximum working frequency, and simultaneously enabling the expansion valve to reach the opening degree matched with the maximum working frequency. Wherein the first frequency increasing speed is larger than the second frequency increasing speed. The control system of the air conditioner comprises a first control module, a second control module, a third control module, a fourth control module, a judgment module and a collection module. The compressor is preheated when the outdoor temperature is lower than 5 ℃, the expansion valve is adjusted while the outer fan is started after the preheating of the compressor is finished, the compressor is started when the outer fan reaches the maximum rotating speed and the opening degree of the expansion valve is reduced to the reference opening degree, the compressor is subjected to frequency boosting in two stages of the frequency boosting speed division of first-speed and second-speed, and the opening degree of the expansion valve is increased to the first target opening degree.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioner under a low-temperature heating working condition is characterized by comprising the following steps:
acquiring an ambient temperature;
when the ambient temperature is lower than the set temperature, 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;
adjusting the opening degree of an expansion valve of the air conditioner to a first target opening degree at the same time, before or after the outer fan starts to increase the speed;
when the external fan and/or the expansion valve reach set conditions, starting a compressor of the air conditioner;
and continuously increasing the frequency of the compressor in stages according to a plurality of increasing frequency speeds.
2. The control method of the air conditioner under the low-temperature heating working condition according to claim 1, further comprising:
after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency;
stopping the compressor from increasing frequency when the compressor frequency reaches the first target frequency.
3. The method for controlling an air conditioner under a low-temperature heating condition according to claim 2, wherein the step of adjusting an opening degree of an expansion valve of the air conditioner to a first target opening degree further comprises:
reducing the opening degree of the expansion valve to a reference opening degree according to a set valve closing speed;
when the expansion valve opening degree reaches the reference opening degree, the expansion valve opening degree is increased to the first target opening degree at a set valve opening speed.
4. The method as claimed in claim 3, wherein the step of starting the compressor of the air conditioner when the external fan and/or the expansion valve reaches a predetermined condition further comprises:
and when the outer fan reaches the first target rotating speed and/or the expansion valve reaches the reference opening degree, starting a compressor of the air conditioner.
5. The method as claimed in claim 2, wherein the step of "enabling the compressor to continuously increase the frequency in stages at a plurality of set speeds" further comprises:
enabling the compressor to perform frequency boosting according to a first frequency boosting speed;
judging whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the compressor is enabled to carry out frequency raising according to a second frequency raising speed;
wherein the transition frequency is less than the first target frequency.
6. The method for controlling an air conditioner under a low temperature heating condition as claimed in claim 5,
the first frequency increasing speed is greater than the second frequency increasing speed; and/or
The first target frequency is a maximum operating frequency of the compressor; and/or
The first target rotating speed is the maximum working rotating speed of the outer fan; and/or
The first target opening degree is an expansion valve opening degree matched with the first target frequency; and/or
The set temperature is 5 ℃; and/or
The step of "warming up a compressor of the air conditioner" is performed by an electric heating manner.
7. The control method of the air conditioner under the low temperature heating working condition according to any one of claims 1 to 6, wherein the control method further comprises:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency; and is
Reducing the rotating speed of the outer fan to a second target rotating speed; and is
Decreasing the expansion valve opening to a second target opening;
the environment parameter is the environment temperature or the environment humidity, and the target parameter is correspondingly a target temperature or a target humidity.
8. The utility model provides a control system of air conditioner under low temperature heating operating mode which characterized in that, control system includes:
the acquisition module is used for acquiring the ambient temperature;
the first control module is used for preheating a compressor of the air conditioner when the ambient temperature is lower than a set temperature;
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;
a third 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 as, before, or after the external air blower starts to increase the speed, and increasing the opening degree of the expansion valve to a first target opening degree at a set valve opening speed when the opening degree of the expansion valve reaches the reference opening degree;
a fourth control module, configured to start a compressor of the air conditioner and to successively up-convert the compressor in stages at a plurality of set speeds when the external blower reaches the first target rotational speed and/or the expansion valve reaches the reference opening degree, and to stop up-converting the compressor when the compressor frequency reaches the first target frequency;
and the judging module is used for judging whether the environment temperature is less than the set temperature, whether the outer fan speeds up to the first target rotating speed, whether the opening degree of the expansion valve reaches the reference opening degree and whether the frequency of the compressor reaches the first target frequency.
9. The system of claim 8, wherein the fourth control module is configured to continuously up-convert the compressor in stages at a plurality of predetermined speeds in the following manner:
the fourth control module enables the compressor to carry out frequency increasing according to a first frequency increasing speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the fourth control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed;
wherein the transition frequency is less than the first target frequency; and/or
The first frequency-increasing speed is greater than the second frequency-increasing speed.
10. The control system for an air conditioner under a low temperature heating condition as claimed in claim 8,
the acquisition module is also used for acquiring environmental parameters;
the judging module is also used for judging whether the environmental parameters reach target parameters;
the 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 used for reducing the opening degree of the expansion valve to a second target opening degree when the environmental parameter reaches the target parameter;
the fourth 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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Effective date of registration: 20200911 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201103 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. |