CN110030696B - Control method of air conditioner under low-temperature high-humidity heating working condition - Google Patents

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

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Publication number
CN110030696B
CN110030696B CN201910267924.0A CN201910267924A CN110030696B CN 110030696 B CN110030696 B CN 110030696B CN 201910267924 A CN201910267924 A CN 201910267924A CN 110030696 B CN110030696 B CN 110030696B
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compressor
opening degree
frequency
air conditioner
controlling
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CN110030696A (en
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汪亚东
张振富
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner under the working condition of low-temperature high-humidity heating. The invention aims to solve the problems of poor quick heating effect and poor lubricating effect of the existing air conditioner. The control method of the invention comprises the following steps: acquiring the ambient temperature and the ambient humidity, preheating the compressor when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, and controlling the expansion valve to close the valve to a first target opening stage by stage continuously according to a plurality of valve closing speeds after preheating is finished; controlling the starting of a compressor of the air conditioner in the process that the opening degree of the expansion valve reaches a first target opening degree; and controlling the compressor to continuously increase the frequency according to the set frequency increasing speed. The method can greatly shorten the frequency rising time of the compressor, achieve the purposes of quickly heating and improving the lubricating effect, improve the comfort of the air conditioner and improve the user experience.

Description

Control method of air conditioner under low-temperature high-humidity heating working condition
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner under the working condition of low-temperature high-humidity heating.
Background
In order to meet the requirement of a user for rapid heating and bring more comfortable use experience, the conventional air conditioner can generally enable the compressor to rapidly 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. For the frequency conversion air conditioner, along with the increase of the working frequency of the compressor, the discharge speed/speed of the lubricating oil is faster and faster, and when the discharge speed/speed of the lubricating oil exceeds the maximum oil return speed/speed of the oil return capillary tube, the phenomenon of oil shortage is easy to generate. 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.
In order to solve the problem, the invention patent application with publication number CN107726557A discloses a control method for an air conditioner under low-temperature and high-humidity heating conditions, and specifically, the control method controls an expansion valve to close and open the valve first, so that the compressor continuously increases the frequency in stages according to a plurality of frequency increasing speeds, thereby avoiding the interruption of the compressor due to the need of waiting for oil return in the frequency increasing process, and reducing the frequency increasing time of the compressor. However, the frequency rising time is still longer, and the frequency rising time of the compressor can be further shortened, so that the quick heating effect of the air conditioner is better. In addition, the control method of controlling the expansion valve to close the valve first and then open the valve is also easy to cause the starting pressure of the air conditioning system to be overlarge, so that the exhaust pipe or the condenser of the compressor bursts. In addition, when the outdoor environment temperature is low and the humidity is high 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 for an air conditioner to solve the problems of the existing control method for increasing the frequency of an air conditioner during starting up, such as poor heating effect due to long frequency increasing time, and poor lubricating effect of a compressor when the ambient temperature is low.
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 working condition of low-temperature and high-humidity heating, wherein the air conditioner comprises a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger, and the outdoor heat exchanger is provided with an external fan, the control method comprises the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating is finished, controlling the expansion valve to close the valve to a first target opening degree in a staged and continuous mode according to a plurality of valve closing speeds;
controlling the compressor of the air conditioner to start in the process that the opening degree of the expansion valve reaches a first target opening degree;
and controlling the compressor to continuously increase the frequency according to the set frequency increasing speed.
In a preferred embodiment of the method for controlling an air conditioner under the low-temperature high-humidity heating condition, the step of controlling the expansion valve to close the valve to the first target opening degree in stages at a plurality of valve closing speeds after the compressor is preheated further comprises:
after the compressor preheating is finished, controlling an external fan of the air conditioner to start, and accelerating to a first target rotating speed according to a set acceleration;
and controlling the expansion valve to close the valve to a first target opening degree in stages and continuously according to a plurality of valve closing speeds at the same time, before or after the starting of the external fan.
In a preferred embodiment of the method for controlling an air conditioner under the low-temperature high-humidity heating condition, the step of controlling the expansion valve to close the valve to the first target opening degree in stages at a plurality of valve closing speeds simultaneously with, before, or after the start of the external blower further comprises:
controlling the opening degree of the expansion valve to be reduced to a reference opening degree according to a set first valve closing speed at the same time, before or after the external fan is started;
and when the opening degree of the expansion valve reaches the reference opening degree, controlling the opening degree of the expansion valve to continuously reduce to the first target opening degree according to a set second valve closing speed.
In a preferable embodiment of the method for controlling an air conditioner under the low-temperature high-humidity heating condition, the step of controlling the start of the compressor of the air conditioner in a process where the opening degree of the expansion valve reaches the first target opening degree further includes:
and after the outer fan is started and the expansion valve reaches the reference opening degree, controlling the compressor of the air conditioner to be started.
In a preferred embodiment of the control method for an air conditioner under the low-temperature high-humidity heating condition, after the step of "controlling the compressor to continuously increase the frequency at a set frequency increasing speed", the control method further includes:
judging whether the frequency of the compressor reaches a first target frequency or not;
and when the frequency of the compressor reaches the first target frequency, controlling the compressor to stop increasing the frequency.
In a preferred technical solution of the control method of the air conditioner under the low-temperature high-humidity heating working condition, the first target frequency is a maximum working frequency of the compressor; and/or
The first target opening degree is an expansion valve opening degree matched with the first target frequency.
In a preferable technical solution of the control method of the air conditioner under the low-temperature high-humidity heating condition, the control method further includes:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, controlling the compressor to reduce the frequency to a second target frequency; and controlling the expansion valve opening degree to decrease to a second target opening degree;
the environment parameter is an environment temperature and/or an environment humidity, the target parameter is a target temperature and/or a target humidity correspondingly, the second target frequency is a rated working frequency of the compressor, and the second target opening degree is an expansion valve opening degree matched with the second target frequency.
In a preferable technical scheme of the control method of the air conditioner under the low-temperature high-humidity heating working condition, the set temperature is 5 ℃; and/or the set humidity is 60%.
In a preferable embodiment of the method for controlling an air conditioner under the low-temperature high-humidity heating condition, the step of controlling the start of the compressor of the air conditioner in a process where the opening degree of the expansion valve reaches the first target opening degree further includes:
and when the outer fan reaches a first target rotating speed and the expansion valve reaches a reference opening degree, starting a compressor of the air conditioner.
The invention also provides a control method of the air conditioner under the working condition of low-temperature high-humidity heating, which comprises the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating is finished, controlling an external fan of the air conditioner to start, and accelerating to a first target rotating speed according to a set acceleration;
controlling an expansion valve of the air conditioner to reduce to a reference opening degree according to a set first valve closing speed at the same time, before or after the starting of the external fan;
when the opening degree of the expansion valve reaches the reference opening degree, controlling the opening degree of the expansion valve to continuously reduce to a first target opening degree according to a set second valve closing speed, wherein the first valve closing speed is greater than the second valve closing speed;
when the outer fan reaches the first target rotating speed and the expansion valve reaches the reference opening degree, controlling the compressor of the air conditioner to start;
controlling the compressor to continuously increase the frequency according to a set frequency increasing speed;
judging whether the frequency of the compressor reaches a first target frequency or not;
and when the frequency of the compressor reaches the first target frequency, controlling the compressor to stop increasing the frequency.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, the method for controlling the air conditioner under the low-temperature high-humidity heating condition includes: acquiring the ambient temperature and the ambient humidity; when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner, and after the preheating of the compressor is finished, controlling an expansion valve to continuously close the valve to a first target opening degree in stages according to a plurality of valve closing speeds; controlling the starting of a compressor of the air conditioner in the process that the opening degree of the expansion valve reaches a first target opening degree; and controlling the compressor to continuously increase the frequency according to the set frequency increasing speed.
The above control method has the advantage that the expansion valve is always in a valve closing state by changing the process of opening degree change of the expansion valve, rather than closing the valve first and then opening the valve as described in the background art, so that the expansion valve can always adapt to the frequency rising of the compressor, namely, the opening degree of the expansion valve is always kept in a matching state when the compressor is started and during the frequency rising of the compressor. Therefore, the compressor does not need to change the frequency raising speed to realize segmented frequency raising like the patent application in the background art, or keep the frequency unchanged for waiting for oil return like the prior art, but can always complete frequency raising at a stable high speed. Due to the increase of the frequency raising speed, the frequency raising time is shortened, and the quick heating effect of the air conditioner is enhanced. In addition, if the expansion valve is first decreased to below the first target opening degree and then increased back to the target opening degree, the starting pressure in the pipeline will gradually increase to a maximum value and then slowly decrease to a stable value, and during the pressure increase, the situation that the exhaust pipe or the condenser of the compressor bursts due to the overlarge starting pressure of the air conditioning system is likely to occur. The control mode of the expansion valve of the invention ensures that the expansion valve is always in a state of gradually reducing to a stable value, so that the starting pressure in the pipeline does not reach a maximum value, but slowly rises to the stable value, and thus, the condition that the exhaust pipe or the condenser of the compressor bursts because the starting pressure of the air conditioning system is overlarge is avoided. Under the winter condition, the compressor is in the low temperature state, can make the lubricating oil viscosity in the compressor uprise to lubricated effect worsens, and through obtaining ambient temperature and ambient humidity before the compressor starts, and when ambient temperature is less than the settlement temperature and ambient humidity is greater than the settlement humidity, make the compressor of air conditioner preheat, just can realize reducing the effect of the viscosity of lubricating oil. The control mode that makes the expansion valve aperture match in advance with the compressor when the compressor starts can make just possess assorted expansion valve aperture before the compressor starts to avoid the expansion valve to start along with the compressor and lead to the not good condition of expansion valve aperture and compressor matching degree to appear, improve the heating effect after the compressor starts rapidly.
Drawings
The control method of the air conditioner under the low temperature and high humidity heating condition according to the present invention will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a flow chart of a control method of an air conditioner under low-temperature high-humidity heating working condition according to the present invention;
FIG. 2 is a comparison graph of the frequency increasing process of the compressor of the control method of the air conditioner under the low-temperature high-humidity heating working condition of the invention and the compressor in 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 greater than 60% according to the control method of the air conditioner under the low-temperature high-humidity heating working condition.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present invention has been described in connection with an embodiment in which the expansion valve is provided with two valve-closing stages, this arrangement is not always the same, and those skilled in the art can also apply the method of the present invention to other application scenarios, for example, the expansion valve may be provided with three or more valve-closing stages, without departing from the principle of the present invention.
Referring first to fig. 1, a method for controlling an air conditioner under low-temperature and high-humidity heating conditions according to the present invention will be described. Fig. 1 is a flowchart of a control method of an air conditioner under a low-temperature high-humidity heating condition according to the present invention.
As shown in fig. 1, in order to solve the problems of poor quick heating effect and poor lubricating effect of a compressor when the ambient temperature is low due to long frequency-raising time in the starting up frequency-raising control method of the existing air conditioner, the invention provides a control method of an air conditioner under the working condition of low-temperature high-humidity heating, which mainly comprises the following steps:
s100, acquiring the ambient temperature and the ambient humidity, wherein the ambient temperature and the ambient humidity can be the temperature and the relative humidity of an outdoor environment through a hygrothermograph or a temperature and humidity sensor and the like after a user presses a starting switch of the air conditioner to start the air conditioner and selects a heating mode;
s200, when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner for 1min by electrifying an electric heating belt arranged in the compressor or directly electrifying the compressor, so that the viscosity of lubricating oil in the compressor is reduced, preferably, the set temperature is 5 ℃ and the set humidity is 60%;
s300, after preheating of the compressor is finished, controlling an outer fan of the air conditioner to start, and increasing the speed to a first target rotating speed according to a set acceleration, for example, after the compressor is preheated for 1min, enabling the outer fan to start 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, simultaneously with, before or after the starting of the external fan, controlling the expansion valve to reduce to a reference opening degree according to a set first valve closing speed, for example, while the external fan starts to operate, controlling the expansion valve to reduce from 480 steps to 400 steps of the reference opening degree according to a first valve closing speed of 200P/S (namely 200 steps/second), 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. Normally, when the air conditioner is in a 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 in the invention can be 480 steps, and of course, the opening degree can also be other larger opening degrees. 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 400 steps, but may be other opening degrees. That is, while the outside fan is started, the expansion valve opening degree is first decreased from 480 steps to 400 steps of the reference opening degree at a first valve closing speed, for example, 200P/s (i.e., 200 steps/sec).
And S500, when the opening degree of the expansion valve reaches the reference opening degree, controlling the opening degree of the expansion valve to continuously reduce to the first target opening degree according to the set second valve closing speed, and continuously closing the valve from the reference opening degree 400 step by the second valve closing speed to the first target opening degree 350 step if the second valve closing speed is 100P/S.
S600, after the external fan is started and the expansion valve reaches the reference opening degree, controlling the compressor of the air conditioner to be started, and if the expansion valve reaches the reference opening degree by 400 steps, the external fan is already in the running state at the moment, and starting the compressor of the air conditioner.
And S700, when the compressor reaches the first target frequency, controlling the compressor to stop increasing the frequency, wherein the first target opening degree is preferably the opening degree of an expansion valve matched with the first target frequency of the compressor, namely, when the compressor is started to the first target frequency, the expansion valve is just reduced from the reference opening degree to the first target opening degree matched with the first target frequency at the second valve closing speed.
It can be seen from the above description that the control method of the air conditioner according to the present invention controls the compressor to preheat first when the ambient temperature is less than 5 ℃ and the ambient humidity is greater 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 method comprises the steps of controlling an external fan of the air conditioner to start after preheating is finished, increasing to a first target rotating speed according to set acceleration, controlling an expansion valve to reduce to a reference opening degree according to set first valve closing speed while, before or after the external fan is started, starting a compressor after the expansion valve reaches the reference opening degree and the external fan is started, and enabling the compressor to just rise to a first target frequency when the expansion valve continues to fall to the first target opening degree, so that the expansion valve is matched with the frequency of the compressor through the reference opening degree and the first target opening degree when the compressor is started to rise to the first target frequency, and the phenomenon that an exhaust pipe or a condenser of the compressor bursts due to overlarge starting pressure of an air conditioning system when the compressor is started is avoided. The compressor can be continuously or continuously increased in frequency or reduced in a high-speed state, the frequency increasing time of the compressor is undoubtedly shortened, and the heating time after the compressor is started can be shorter, so that the purpose of quick heating is achieved. That is, the invention cancels the process of stopping frequency rising and waiting oil return in the frequency rising process of the compressor, and ensures the normal oil return of the compressor by controlling the opening degree of the expansion valve to be matched with the working frequency of the compressor. Meanwhile, the invention also avoids the speed reduction process when the compressor is in a sectional frequency increasing process, but leads the compressor to be directly increased to the first target frequency at a very high frequency increasing speed after being started, thus greatly reducing the frequency increasing time of the compressor and solving the problem of poor quick heating effect caused by long frequency increasing time in the prior air conditioner starting frequency increasing control method. Because the external environment humidity is great, the temperature of outdoor heat exchanger is less than outdoor ambient temperature, produces a difference in temperature, and outdoor heat exchanger is because the temperature is lower, produces the frosting phenomenon easily. After the compressor is preheated and before the compressor is started, the outer fan is in an operating state, and when the compressor is started, the outer fan drives air to flow at a high rotating speed in advance to accelerate heat exchange, so that the temperature difference between the outdoor heat exchanger and the external air is reduced, and the frosting of the outdoor heat exchanger can be prevented.
Of course, the reference opening degree and the first target opening degree of the expansion valve are not constant, but are related to a frequency required when the compressor is started and the first operating frequency of the compressor, which is usually confirmed by practical experiments, and the first operating frequency is different depending on the compressor power, brand, and the like. Preferably, the first target frequency is the highest operating frequency of the compressor, so that the compressor can complete heating at the fastest speed, and of course, the first target frequency may be a value close to the highest operating frequency, so that incomplete full-load movement of the compressor is ensured, and the compressor is protected, so that the service life of the compressor is prolonged. Likewise, since the reference opening degree and the first target opening degree are not completely determined, and accordingly, the time for reaching the reference opening degree and the first target opening degree is not determined, the first closing speed and the second closing speed are not constant, but those skilled in the art can perform adjustment according to actual conditions as long as the adjustment enables the compressor to be rapidly frequency-raised. Likewise, the setting of the ambient humidity 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 described below with reference to fig. 2. Fig. 2 is a comparison diagram of the frequency increasing process of the compressor of the control method of the air conditioner under the low-temperature high-humidity heating working condition of the invention and the compressor in the prior art. In fig. 2, a thick solid line represents the frequency increasing process of the compressor according to the control method of the present invention, a thin solid line represents the frequency increasing process of the compressor according to the control method of the patent application publication No. CN107726557A (hereinafter, or simply referred to as a reference patent) described in the background art, and a dotted line represents the frequency increasing process of the compressor according to 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. In the referenced patent, the compressor employs continuous frequency boosting, but it begins with a faster frequency boosting rate V during the frequency boosting process1(e.g. 1.5Hz/s) and then, since the opening of the expansion valve is too small, the rate of the boost has to be reduced by V2(e.g., 0.7Hz/s) up-converted to a maximum frequency fmaxThe time of (2) is relatively shortened, but the shortening time is limited.
With continued reference to fig. 2, in the preferred embodiment of the present invention, the compressor frequency up-conversion exists in the frequency maintaining state for oil return, and the state of reducing the up-conversion speed does not exist in the frequency increasing state, but the frequency increasing speed V is higher3(e.g. 2Hz/s) up to a maximum frequency fmaxThe time required for its up-conversion is substantially reduced relative to the time in both the prior art and the referenced patent.
The setting mode has the advantages that: the invention can ensure the normal oil return of the compressor and simultaneously can enable the compressor to be quickly increased to the maximum working frequency, thereby meeting the requirement of quick heating of users. As is apparent from fig. 2, 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 and the time of the reference patent through repeated experiments by the inventors.
The principles of the present invention are further described below with reference to fig. 3. Fig. 3 is a control logic diagram of the electric heating belt, the compressor, the external fan and the expansion valve when the ambient temperature is less than 5 ℃ and the ambient humidity is greater than 60% according to the control method of the air conditioner under the low-temperature high-humidity heating working condition.
Looking first only at the curve control diagram of the electronic expansion valve, in a preferred embodiment of the figure, we can clearly see that the first valve closing speed V21' greater than second valve-closing speed V22' of course, this is not essential, and the sizes of both are not specified but obtained by experimental data.
In addition, referring to the upper three curves of fig. 3, in a preferred embodiment, the step of S600 further includes:
and S610, when the outer fan reaches the first target rotating speed and the expansion valve reaches the reference opening degree, starting the compressor of the air conditioner.
The setting mode has the advantages that: when the compressor is started, the external fan is in the maximum working rotating speed, and heat exchange can be rapidly carried out between the outdoor unit of the air conditioner and the outdoor environment, so that the heat exchange of the air conditioner is the best, the heating effect of the air conditioner is achieved more rapidly, and the frosting possibility is reduced to the minimum.
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.
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 frequency raising speed on the premise of ensuring the normal oil return of the compressor. If the valve closing stage can be further divided into three or more stages, each stage performs valve closing at different valve closing speeds, and the like.
In addition, in order to better improve the experience of the user using the air conditioner, when the compressor operates at the maximum operating frequency, the control method of the air conditioner of the present invention may further include the steps of:
s800, acquiring environmental parameters, such as current environmental temperature (such as indoor temperature);
s900, when the environmental parameter reaches/approaches the target parameter, the compressor is reduced to a second target frequency, meanwhile, the rotating speed of the outer fan is reduced to the second target rotating speed, and the opening degree of the expansion valve is reduced to the second target opening degree.
The advantages of this arrangement are: after the air conditioner heats rapidly for a period of time, the indoor temperature rises correspondingly, when the ambient temperature reaches/approaches the temperature set by a user, the compressor does not need to work continuously at the maximum working frequency, the external fan does not need to work at the maximum rotating speed for heat dissipation naturally, and the expansion valve does not need to work at the first target opening matched with the compressor. At this time, the compressor is reduced to the rated working frequency or the working frequency more matched with the current environment (such as outdoor temperature), the rotating speed of the outer fan is reduced to the rated working rotating speed or the rotating speed matched with the compressor, and the opening degree of the expansion valve is reduced to the opening degree matched with the compressor, so that the normal work of the air conditioner can be ensured, and the working life of the compressor, the outer fan and the expansion valve can be effectively prolonged.
Of course, the environmental parameter and the corresponding target parameter are not all the same, but may be environmental humidity (such as indoor/outdoor humidity), target humidity set by the user, and the like.
The operation principle of the control method of the air conditioner in the heating mode according to the present invention will be briefly described with reference to fig. 3. 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 the air conditioner to heat → obtaining the ambient temperature and the ambient humidity, and enabling the electric heating belt of the compressor to be under the voltage U when the ambient temperature is less than 5 ℃ and the ambient humidity is more than 60%1' Power on → Via T0After the time interval, the electric heating belt is powered off, the preheating is completed → after the preheating of the compressor is finished, the outer fan is controlled according to the acceleration a1The rotation speed is increased, and the expansion valve starts to increase the speed at the same time according to a first valve closing speed V21' Slave opening degree B1' Start decrease opening → Via T1After a time interval, the outer fan reaches the maximum working speed n'1The expansion valve reaches the reference opening degree B'2At the same time, the compressor is started and the frequency is increased according to the increasing speed V11The expansion valve is raised according to a second valve closing speed V22' continuously reducing the opening, the outer fan keeps the maximum working speed to operate → warp T2Compressor ramp-up to maximum operating frequency f 'after time interval'1Stopping raising the frequency, reducing the opening degree of the expansion valve to an opening degree B 'matched with the maximum working frequency'3And is stabilized at the opening → the meridian T3And T4After the time interval, the indoor temperature and humidity reach the set temperature and humidity of the user, and the compressor reduces the frequency at the speed V12' Down-conversion while the outer fan is accelerated by an acceleration a2' reduced speed, expansion valve closing speed V23' reduced opening → warp T5Compressor frequency reduction to rated operating frequency f 'after time interval'2And maintaining the frequency, and simultaneously reducing the rotating speed of the outer fan to the rated working rotating speed n'2And maintained at this frequency, the expansion valve opening is reduced to f'2Matched B'4And maintained at this frequency.
Of course, through T1After the time interval has elapsed, the system will,when the compressor is started, the external fan can not reach the maximum working rotating speed n'1The compressor can be started as long as the outer fan starts and the expansion valve reaches the reference opening degree, and compared with the starting of the compressor, the outer fan is restarted, or the two are started simultaneously, and the frosting condition can be reduced as long as the outer fan is started before the compressor. Of course, the external blower and the expansion valve do not have to be started simultaneously, and the expansion valve may be started before or after the external blower is started, and the starting sequence of the two is not limited.
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 (9)

1. A control method of an air conditioner under the working condition of low-temperature high-humidity heating is disclosed, the air conditioner comprises a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger, the outdoor heat exchanger is provided with an outer fan, and the control method is characterized by comprising the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating is finished, controlling the expansion valve to close the valve to a first target opening degree in a staged and continuous mode according to a plurality of valve closing speeds;
controlling the compressor of the air conditioner to start in the process that the opening degree of the expansion valve reaches a first target opening degree;
controlling the compressor to continuously increase the frequency according to a set frequency increasing speed;
the step of controlling the expansion valve to close the valve to a first target opening degree in stages at a plurality of valve closing speeds after the compressor preheating is completed includes: after the preheating of the compressor is finished, controlling an outer fan of the air conditioner to start, and controlling the opening degree of the expansion valve to be reduced to a reference opening degree according to a set first valve closing speed at the same time, before or after the outer fan is started;
the step of controlling the start of the compressor of the air conditioner while the opening degree of the expansion valve reaches the first target opening degree includes: and after the outer fan is started and the expansion valve reaches the reference opening degree, controlling the compressor of the air conditioner to be started.
2. The method as claimed in claim 1, wherein the step of controlling the expansion valve to close the valve to the first target opening degree in stages at a plurality of valve closing speeds after the compressor is preheated further comprises:
after an external fan of the air conditioner is started, the speed is increased to a first target rotating speed according to a set acceleration.
3. The method as claimed in claim 2, wherein the step of controlling the expansion valve to close the valve to the first target opening degree in stages at a plurality of valve closing speeds after the compressor is preheated further comprises:
and when the opening degree of the expansion valve reaches the reference opening degree, controlling the opening degree of the expansion valve to continuously reduce to the first target opening degree according to a set second valve closing speed.
4. The method for controlling the air conditioner under the low-temperature high-humidity heating condition according to claim 1, wherein after the step of controlling the compressor to continuously increase the frequency at the set frequency increasing speed, the method further comprises:
judging whether the frequency of the compressor reaches a first target frequency or not;
and when the frequency of the compressor reaches the first target frequency, controlling the compressor to stop increasing the frequency.
5. The method for controlling the air conditioner under the low-temperature high-humidity heating condition according to claim 4,
the first target frequency is a maximum operating frequency of the compressor; and/or
The first target opening degree is an expansion valve opening degree matched with the first target frequency.
6. The control method of the air conditioner under the low-temperature high-humidity heating working condition according to claim 4, further comprising the following steps of:
acquiring an environmental parameter;
when the environmental parameter reaches a target parameter, controlling the compressor to reduce the frequency to a second target frequency; and controlling the expansion valve opening degree to decrease to a second target opening degree;
the environment parameter is an environment temperature and/or an environment humidity, the target parameter is a target temperature and/or a target humidity correspondingly, the second target frequency is a rated working frequency of the compressor, and the second target opening degree is an expansion valve opening degree matched with the second target frequency.
7. The method for controlling the air conditioner under the working condition of low-temperature high-humidity heating according to claim 1, wherein the set temperature is 5 ℃; and/or the set humidity is 60%.
8. The method for controlling the air conditioner under the low-temperature high-humidity heating condition according to claim 2, wherein the step of controlling the compressor of the air conditioner to start up in the process that the opening degree of the expansion valve reaches the first target opening degree further comprises:
and when the outer fan reaches a first target rotating speed and the expansion valve reaches a reference opening degree, starting a compressor of the air conditioner.
9. A control method of an air conditioner under the working condition of low-temperature high-humidity heating is characterized by comprising the following steps:
acquiring the ambient temperature and the ambient humidity;
when the ambient temperature is lower than the set temperature and the ambient humidity is higher than the set humidity, preheating a compressor of the air conditioner;
after the compressor preheating is finished, controlling an external fan of the air conditioner to start, and accelerating to a first target rotating speed according to a set acceleration;
controlling an expansion valve of the air conditioner to reduce to a reference opening degree according to a set first valve closing speed at the same time, before or after the starting of the external fan;
when the opening degree of the expansion valve reaches the reference opening degree, controlling the opening degree of the expansion valve to continuously reduce to a first target opening degree according to a set second valve closing speed, wherein the first valve closing speed is greater than the second valve closing speed;
when the outer fan reaches the first target rotating speed and the expansion valve reaches the reference opening degree, controlling the compressor of the air conditioner to start;
controlling the compressor to continuously increase the frequency according to a set frequency increasing speed;
judging whether the frequency of the compressor reaches a first target frequency or not;
and when the frequency of the compressor reaches the first target frequency, controlling the compressor to stop increasing the frequency.
CN201910267924.0A 2019-04-03 2019-04-03 Control method of air conditioner under low-temperature high-humidity heating working condition Active CN110030696B (en)

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