CN112797588A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN112797588A CN112797588A CN202110173041.0A CN202110173041A CN112797588A CN 112797588 A CN112797588 A CN 112797588A CN 202110173041 A CN202110173041 A CN 202110173041A CN 112797588 A CN112797588 A CN 112797588A
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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
- F24F11/62—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
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—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
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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
- F24F11/70—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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- 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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
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- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner, comprising: an indoor heat exchanger operating as a condenser or an evaporator; an indoor fan for driving air to flow; an outdoor heat exchanger operating as an evaporator or a condenser; a compressor for discharging the compressed refrigerant into the condenser; an outdoor fan for driving air to flow; further comprising: a controller configured to selectively perform a low-loop-temperature control strategy or a high-loop-temperature control strategy according to an outdoor ambient temperature to control the operation of the compressor in a high-temperature sterilization mode, wherein a target discharge pressure of the compressor set in the low-loop-temperature control strategy is greater than a target discharge pressure of the compressor set in the high-loop-temperature control strategy. The invention can better ensure the operation effect of the high-temperature sterilization function.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to an air conditioner.
Background
There are more and more models of commercially available air conditioners that increase the function of high temperature sterilization. Related studies have shown that most bacteria and viruses are sensitive to heat, and temperatures above 56 ℃ for 30 minutes can inactivate many bacterial viruses. For the air conditioner, if the air outlet temperature of the air conditioner can be ensured to be more than 56 ℃ and last for 30 minutes, or the temperature of fins and the temperature of pipelines of the indoor heat exchanger can be ensured to reach 56 ℃ and last for 30 minutes, the ideal sterilization and disinfection effect can be achieved. Therefore, whether the air conditioner air outlet temperature, the indoor heat exchanger fin temperature and the pipeline temperature can reach more than 56 ℃ and last for 30 minutes under most environmental conditions is the key point for realizing the high-temperature sterilization function.
The degerming control method for air conditioners provided in the prior art mainly focuses on the adjustment of the exhaust temperature of a compressor and the supercooling degree of an indoor unit, for example, the technical scheme disclosed in the chinese patent application (CN 11175484A): after the air conditioner enters a sterilization mode, recording sterilization time; adjusting the exhaust temperature of the compressor to make the exhaust temperature fall into a degerming temperature range; adjusting the supercooling degree of the indoor unit to enable the supercooling degree to fall into a degerming supercooling degree range; and exiting the degerming mode after the degerming time is longer than the preset time. In this control mode, the entire air conditioning system is operated in the heating mode, and after the sterilization control is performed, the algorithm does not consider the influence of the outdoor ambient temperature on the adjustment effect, but the sampling of the algorithm itself has hysteresis since the discharge temperature of the compressor is taken as the control target. When the outdoor temperature is lower, the conditions that the air outlet temperature, the temperature of the heat exchanger fins and the temperature of the pipeline cannot reach more than 56 ℃ easily occur, and the problem of insufficient sterilization and disinfection effects can occur. When the temperature is high outdoors or high indoors, the discharge temperature of the compressor may exceed the shutdown protection threshold, so that the compressor enters a shutdown protection state and cannot meet the requirement that the high temperature lasts for 30 minutes.
Disclosure of Invention
The invention provides an air conditioner aiming at the problems that the air-out temperature, the heat exchanger fin temperature and the pipeline temperature can not reach more than 56 ℃ easily and the sterilization and disinfection effect is insufficient when the outdoor temperature is low, or the exhaust temperature of a compressor can exceed the shutdown protection threshold value when the outdoor temperature or the indoor temperature is high, so that the compressor enters a shutdown protection state and the requirement of high temperature lasting for 30 minutes can not be met in the prior art.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
an air conditioner comprising: an indoor heat exchanger operating as a condenser or an evaporator; an indoor fan for driving air to flow; an outdoor heat exchanger operating as an evaporator or a condenser; a compressor for discharging the compressed refrigerant into the condenser; an outdoor fan for driving air to flow; further comprising: a controller configured to selectively perform a low-loop-temperature control strategy or a high-loop-temperature control strategy according to an outdoor ambient temperature to control the operation of the compressor in a high-temperature sterilization mode, wherein a target discharge pressure of the compressor set in the low-loop-temperature control strategy is greater than a target discharge pressure of the compressor set in the high-loop-temperature control strategy.
In order to avoid that the actual exhaust pressure rises too fast due to too high calculation frequency of the target exhaust pressure and causes overshoot or exceeds the rated operation range of a compressor to cause shutdown protection because the target exhaust pressure is set to be too high at the initial stage of entering a high-temperature sterilization mode, at least a first target exhaust pressure and a second target exhaust pressure which are increased progressively are set in the low-ring-temperature control strategy; the controller is configured to control the compressor to operate at a first target exhaust pressure in a first stage after entering the high-temperature sterilization mode and executing the low-loop-temperature control strategy, and to control the compressor to operate at a second target exhaust pressure after the first stage.
In order to improve the response speed of the frequency adjustment of the compressor, the controller is configured to shorten the period of calculating the operating frequency of the compressor after entering the high-temperature sterilization mode and selecting the execution of the low-ring-temperature control strategy.
In order to improve the adjustment precision of the frequency of the compressor and prevent the frequency from generating large-amplitude fluctuation in a short time to cause the system to be incapable of running stably, the controller is configured to reduce the amplitude of adjusting the frequency of the compressor every time after entering a high-temperature sterilization mode and selecting to execute a low-loop-temperature control strategy.
In order to increase the outlet air temperature and the surface temperature of the indoor heat exchanger by reducing the air circulation volume, the controller is configured to reduce the air speed of the indoor fan after entering the high-temperature sterilization mode and selecting the low-loop-temperature control strategy.
In order to avoid the phenomenon of shutdown protection of the compressor, the high-loop-temperature control strategy calls a set target exhaust pressure corresponding to the indoor target temperature as the set target exhaust pressure of the compressor in the high-loop-temperature control strategy.
For the case that the outdoor temperature is very high and close to a critical state, the controller is configured to reduce the wind speed of the indoor fan after entering a high-temperature sterilization mode and selecting to execute a high-loop-temperature control strategy; the controller is configured to sample an outdoor ambient temperature after reducing the air speed of the indoor fan and increase the air speed of the indoor fan to a maximum air speed gear when the outdoor ambient temperature is higher than a load threshold value, so as to prevent the compressor from entering shutdown protection by increasing the air circulation volume.
To increase the response speed of the compressor frequency adjustment, the controller is configured to shorten a period for calculating the compressor operating frequency after entering the high-temperature sterilization mode and selecting the execution of the high-loop-temperature control strategy.
In order to improve the adjustment precision of the frequency of the compressor and prevent the frequency from generating large-amplitude fluctuation in a short time to cause the system to be incapable of running stably, the controller is configured to reduce the amplitude of adjusting the frequency of the compressor every time after entering a high-temperature sterilization mode and selecting to execute a high-loop-temperature control strategy.
As a preferable auxiliary control means, the controller is further configured to set a low-loop-temperature compressor start frequency and a high-loop-temperature compressor start frequency according to an outdoor ambient temperature to control the operation of the compressor in the high-temperature sterilization mode, wherein the low-loop-temperature compressor start frequency is greater than the high-loop-temperature compressor start frequency.
Compared with the prior art, the invention has the advantages and positive effects that:
when the outdoor environment temperature is lower, the invention has a higher target exhaust pressure target of the compressor, and controls the operation of the compressor by taking the target exhaust pressure target as a reference, thereby ensuring that the air outlet temperature, the fin temperature of the indoor heat exchanger and the pipeline temperature reach and stabilize above 56 ℃, realizing the high-temperature sterilization effect, and making up the deviation caused by the excessively low outdoor environment temperature through the performance of the air conditioner. And when the outdoor environment temperature is higher, a relatively lower target discharge pressure target of the compressor is adopted and is used as a reference to control the operation of the compressor, so that the condition that the discharge temperature of the compressor exceeds a shutdown protection threshold value and enters a shutdown protection state due to the outdoor high temperature is avoided, and the requirement that the high temperature lasts for 30 minutes is met.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram schematically illustrating the structure of an air conditioner according to the present invention;
FIG. 2 is a flow chart illustrating an operation status of a controller in an air conditioner according to the present invention;
fig. 3 is a flowchart illustrating another operation state of the controller in the air conditioner according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The invention provides an air conditioner, preferably a split air conditioner, aiming at the problems that the algorithm adopted in the high-temperature sterilization mode of the air conditioner in the prior art does not consider the influence of outdoor environment temperature on the control effect, when the exhaust temperature of a compressor is adopted as a control target, the sterilization and disinfection effect is insufficient due to the fact that the outdoor temperature is low, the air outlet temperature, the temperature of a heat exchanger fin and the temperature of a pipeline cannot reach more than 56 ℃, or the exhaust temperature of the compressor may exceed a shutdown protection threshold value due to the fact that the outdoor temperature or the indoor temperature is high, the compressor enters a shutdown protection state, and the requirement that the high temperature lasts for 30 minutes cannot be met. As shown in fig. 1, the air conditioner includes an indoor heat exchanger 10 operating as a condenser or an evaporator, an indoor fan driving air to flow and disposed at an indoor side, an outdoor heat exchanger 20 operating as an evaporator or a condenser, a compressor 30 discharging compressed refrigerant into the condenser, and an outdoor fan driving air to flow. Of course also a throttle device 40 in a cooling (heating) system. The motor for driving the compressor 30, the motor for driving the indoor fan, and the motor for driving the outdoor fan may be ac motors. The alternating current motor has the advantage of low cost, but the alternating current motor cannot adjust the rotating speed in multiple stages like a direct current motor, and the design of the controller 50 can make up the defect that the alternating current motor cannot adjust the rotating speed in multiple stages, so that the air conditioner has better performance, and particularly has better performance in a high-temperature sterilization mode.
The high-temperature sterilization mode may be regarded as a heating mode having specific parameters, for example, forcibly setting the indoor ambient temperature to 16 ℃ (without using a temperature detection value of a temperature sensor provided at an air return opening or other location), and forcibly setting the target ambient temperature to 32 ℃ (without using a target ambient temperature input by a user through a remote controller, a line controller, or other remote terminal), so that the temperature of the indoor heat exchanger 10 is significantly increased. If the indoor heat exchanger 10 adopts a finned tube heat exchanger, the fin temperature of the heat exchanger and the temperature of a heat exchanger pipeline both reach above 56 ℃, and further the temperature of an air outlet of an indoor unit reaches above 56 ℃, so that the effects of high-temperature sterilization and disinfection are achieved.
As shown in fig. 1, a controller 50 is particularly provided in the air conditioner. The controller 50 is configured to selectively perform a specially designed low-loop-temperature control strategy in which a target discharge pressure of the compressor is set to be greater than a target discharge pressure of the compressor in the high-loop-temperature control strategy or perform a specially designed high-loop-temperature control strategy according to an outdoor ambient temperature to control the operation of the compressor 30 in the high-temperature sterilization mode. In the normal heating mode, the controller 50 stores a set target discharge pressure, and determines to control the compressor to increase or decrease the frequency or maintain the frequency of the compressor unchanged in the next cycle based on the set target discharge pressure.
One way of calculating the compressor target frequency based on compressor discharge pressure is given below:
Fb(n)＝ Fb(n-1) ＋⊿F
if Pd < 1.6 Mpa, Δ F ≦ 10 ≦ Δ Pd (n)) + 18 × Pd (n), wherein Δ F satisfies 0 ≦ Δ F ≦ 10;
if 1.6 Mpa ≦ Pd < Pdo-0.2 Mpa, then Δ F ≦ 10 × (ΔPd (n) — (Δ Pd (n-1)) + 5 × Pd (n), wherein Δ F satisfies 0 ≦ F ≦ 6;
if Pdo-0.2 Mpa ≦ Pd ≦ Pdo, then Δ F ≦ 0;
if Pdo < Pd < Pn-0.05 Mpa, Δ F ═ 27 x ([ delta ] Pd (n) - [ delta ] Pd (n-1)) + 15 x Δ Pd (n), where Δ F satisfies-25 ≦ Δ F ≦ 0;
in the above formula, n is the current period; fb (n) the compressor operating frequency calculated for the current cycle; fb (n-1) is the compressor running frequency calculated in the previous period; the delta F is the frequency variation of the compressor; pd is the real-time compressor discharge pressure; pdo is set target exhaust pressure; Δ Pd (n) sets a difference between the target discharge pressure and the real-time compressor discharge pressure for the current period, i.e., Pdo-Pd; Δ Pd (n-1) sets a difference between the target discharge pressure and the real-time compressor discharge pressure for the previous cycle.
In the above formula, the discharge pressure of the compressor is compared with the adopted constants of 1.6 Mpa, 0.2 Mpa and 0.05 Mpa, which are set according to the type of the compressor in common use and can be represented by the symbols α, β and γ, respectively. If other types or capacities of compressors are selected, the values of α, β, and γ can be adjusted as appropriate.
In a specific example of the ordinary heating mode, the target exhaust pressure Pdo =3.1Mpa is set, and according to the above equation, in one period, if there is 1.6 Mpa ≦ Pd < 2.9Mpa, Δ F may be calculated, and Δ F satisfies 0 ≦ Δ F ≦ 6, that is, the compressor is in the up-conversion operation; if Pd is more than or equal to 2.9MPa and less than or equal to 3.1MPa, the difference between delta F and 0 can be obtained, namely the frequency of the compressor is kept unchanged; if Pd is larger than 3.1Mpa, the difference between delta F and delta F is satisfied, i.e. the compressor operates in a frequency reduction mode, wherein delta F is less than or equal to-25 and less than delta F is less than or equal to 0. Optionally, the set period is 1 minute, that is, the real-time compressor discharge pressure is sampled once per minute and the compressor frequency is calculated once.
The low loop temperature control strategy or the high loop temperature control strategy designed in the controller 50 adjusts the set target discharge pressure of the compressor, and specifically, the target discharge pressure of the compressor set in the low loop temperature control strategy is greater than the target discharge pressure of the compressor set in the high loop temperature control strategy. Therefore, when the outdoor environment temperature is lower, the target exhaust pressure control target of the compressor is higher, the target exhaust pressure control target is used as a reference to control the operation of the compressor, the air outlet temperature, the temperature of fins of the indoor heat exchanger and the temperature of pipelines are guaranteed to reach and be stabilized above 56 ℃, the high-temperature sterilization effect is realized, and the deviation caused by the excessively low outdoor environment temperature is compensated through the performance of the air conditioner. And when the outdoor environment temperature is higher, a relatively lower target discharge pressure target of the compressor is adopted and is used as a reference to control the operation of the compressor, so that the condition that the discharge temperature of the compressor exceeds a shutdown protection threshold value and enters a shutdown protection state due to the outdoor high temperature is avoided, and the requirement that the high temperature lasts for 30 minutes is met.
And preferably, the method for judging to execute the low-environment-temperature control strategy or the high-environment-temperature control strategy is carried out by comparing the current outdoor environment temperature with the environment temperature threshold value. As shown in fig. 2, which is a flowchart of the controller, as shown in S10, the controller enters the pasteurization mode after receiving a mode control signal, which may be from a remote controller, a wire controller or other control terminal; after entering the high-temperature sterilization mode, comparing the outdoor ambient temperature with the environmental temperature threshold value as shown in S11; as shown in S13, if the current outdoor ambient temperature is greater than or equal to the ambient temperature threshold, then a high ambient temperature control strategy is selected to be executed; if the current outdoor ambient temperature is less than the loop temperature threshold, the low loop temperature control strategy is selected to be executed, as shown in S12. Under laboratory conditions, it may be measured that an optional ambient temperature threshold may be set to 25 ℃, i.e., if the current outdoor ambient temperature is greater than or equal to 25 ℃, the high ambient temperature control strategy is selected to be executed, and if the current outdoor ambient temperature is less than 25 ℃, the low ambient temperature control strategy is selected to be executed.
Fig. 3 shows a flow chart of a complete, preferred operating state of the controller.
And S20, the controller enters a high-temperature sterilization mode after receiving the mode control signal. The mode control signal may come from a remote control, a line controller or other control terminal.
S21, sample the ambient temperature outside the chamber. The outdoor environment temperature can be detected by a temperature sensor arranged in the outdoor unit, and can also be obtained by sampling in a wireless communication mode.
And S22, after entering the high-temperature sterilization mode, comparing the outdoor environment temperature with the environment temperature threshold value. The ring temperature threshold may be set at 25 deg.c.
And S23, if the outdoor environment temperature is less than the ring temperature threshold value, executing a low ring temperature control strategy, and controlling the compressor to operate by taking the first target exhaust pressure as a control target. The first target exhaust pressure is greater than the set target exhaust pressure of the heating mode algorithm in the related art, and may be set to 3.4MPa, for example.
S24, the controller is further configured to shorten a period of calculating the compressor operating frequency to a target calculation period. For example, the set period is shortened from 1 minute to the target calculation period of 20 seconds, and the response speed of the frequency adjustment of the compressor is increased.
S25, the controller is further configured to reduce the amplitude of each adjustment of the compressor frequency to a target adjustment amplitude. I.e., the compressor up-or down-conversion rate is adjusted, which is typically set to 2Hz/s in prior art heating mode algorithms. The controller can adjust the amplitude of the frequency of the compressor to 0.1Hz/s from 2Hz/s each time, so that the adjustment precision of the frequency of the compressor is improved, and the problem that the system cannot stably run due to large-amplitude fluctuation of the frequency in a short time is prevented.
And S26, the controller is further configured to reduce the wind speed of the indoor fan to a low wind gear, and the air outlet temperature and the surface temperature of the indoor heat exchanger are increased by reducing the air circulation volume.
It should be noted that, the above-mentioned control of shortening the period of calculating the operating frequency of the compressor to the target calculation period, reducing the amplitude of adjusting the frequency of the compressor to the target adjustment amplitude each time, and reducing the wind speed of the indoor fan to the low wind gear may be configured separately, but the three control means are provided simultaneously to balance the requirements for the heating performance and the system stability, so as to have better control effect.
S27, the controller further determines whether the first phase is over. The first stage is optional and is set within the first 3 minutes after entering the high-temperature sterilization mode.
S28, if the first phase is over, the controller is further configured to control the compressor operation with a second target discharge pressure as a control target, the second target discharge pressure being greater than the first target discharge pressure and, for example, may be set to 3.6 MPa.
S29, the controller is further configured to maintain the period of calculating the compressor operating frequency as a target calculation period.
S30, the controller is further configured to maintain the amplitude of each adjustment of the compressor frequency at a target adjustment amplitude.
S31, the controller is further configured to maintain the indoor fan operating in a low wind range.
S32, the controller further judges whether the second stage is finished, the second stage is optional, and the second stage is set to be 3-8 minutes after the high-temperature sterilization mode is entered.
S33, if the second stage is finished, the controller is further configured to control the compressor operation with a third target discharge pressure as a control target, the third target discharge pressure being greater than the second target discharge pressure, which may be set to 3.8MPa, for example.
The mode of gradually increasing in stages and increasing from the first target exhaust pressure to the third target exhaust pressure can avoid that the target exhaust pressure is set too high at the initial stage of entering a high-temperature sterilization mode, so that the calculation frequency is too high according to the target exhaust pressure, and further the actual exhaust pressure rises too fast, so that the overshoot is caused or the stop protection is caused when the operation rated operation range of the compressor is exceeded. The control can play a role in protection in advance because the estimation of the exhaust pressure of the compressor has certain hysteresis. It should be noted that three stages are a preferred method. To achieve the same effect, at least a first target exhaust pressure and a second target exhaust pressure are set incrementally in the low loop temperature control strategy. The controller is configured to control the compressor to operate at a first target exhaust pressure in a first stage after entering the high-temperature sterilization mode and executing the low-loop-temperature control strategy, and to control the compressor to operate at a second target exhaust pressure after the first stage.
S34, the controller is further configured to maintain the period of calculating the compressor operating frequency as a target calculation period.
S35, the controller is further configured to maintain the amplitude of each adjustment of the compressor frequency at a target adjustment amplitude.
S36, the controller is further configured to maintain the indoor fan operating in a low wind range.
S37, it is determined whether the set time of the high temperature sterilization mode has been reached, for example, 30 minutes.
And S38, if the set time of the high-temperature sterilization mode is reached, the high-temperature sterilization mode is exited.
If the outdoor environment temperature is greater than or equal to the ring temperature threshold, the flow of the controller is as follows.
And S39, the controller selects to execute a high-ambient-temperature control strategy to set the target exhaust pressure as a control target to control the operation of the compressor. For example, the target exhaust pressure is set to 3.1 MPa. When the outdoor environment temperature is greater than or equal to the environmental temperature threshold value, the load of the air conditioner is large, if the target exhaust pressure is continuously increased, the possibility that the frequency of the compressor is too high is increased, and the compressor is further possibly stopped for protection.
S40, the controller is further configured to reduce the indoor fan speed to a low wind gear. The air outlet temperature and the surface temperature of the indoor heat exchanger are improved by reducing the air circulation amount.
S41, the controller is further configured to shorten a period of calculating the compressor operating frequency to a target calculation period. For example, the set period is shortened from 1 minute to the target calculation period of 20 seconds, and the response speed of the frequency adjustment of the compressor is increased.
S42, the controller is further configured to reduce the amplitude of each adjustment of the compressor frequency to a target adjustment amplitude. I.e., the compressor up-or down-conversion rate is adjusted, which is typically set to 2Hz/s in prior art heating mode algorithms. The controller can adjust the amplitude of the frequency of the compressor to 0.1Hz/s from 2Hz/s each time, so that the adjustment precision of the frequency of the compressor is improved, and the problem that the system cannot stably run due to large-amplitude fluctuation of the frequency in a short time is prevented.
It should also be noted that, the above-mentioned control for shortening the period of calculating the operating frequency of the compressor to the target calculation period, reducing the amplitude of adjusting the frequency of the compressor to the target adjustment amplitude each time, and reducing the wind speed of the indoor fan to the low wind gear can be configured separately, but the three control means can balance the requirements for the heating performance and the system stability, and has better control effect.
And S43, judging whether the outdoor environment temperature is larger than the load threshold value or not in the process of executing the high-ambient-temperature control strategy. The load threshold is preferably a temperature constant greater than the ring temperature threshold, for example 30 ℃.
And S44, the controller is configured to keep the indoor fan working at a low wind gear and keep the wind outlet temperature and the fin temperature stable at a state higher than 56 ℃ under the condition that the outdoor environment temperature is less than or equal to the load threshold.
And S45, the controller is configured to increase the wind speed of the indoor fan to the highest wind speed gear under the condition that the outdoor environment temperature is larger than the load threshold value. When the outdoor environment temperature is greater than the load threshold value, the load of the air conditioner reaches a critical value, and if the indoor fan continues to work at a low wind gear, the discharge pressure of the compressor is easily caused to be too high, so that the compressor is shut down for protection. Under the condition, the controller automatically increases the wind speed of the indoor fan to the highest wind speed gear, enhances the heat exchange between the indoor heat exchanger and the nearby air, and reduces the heat load of the air conditioner. During the continuous 30-minute period required for the high-temperature sterilization mode, normally, the outdoor ambient temperature does not jump more than 5 ℃, so when the outdoor ambient temperature is greater than the load threshold, the controller is configured to increase the wind speed of the indoor fan to the highest wind speed gear and maintain the highest wind speed gear.
S46, it is determined whether the set time of the high temperature sterilization mode has been reached, for example, 30 minutes.
And S47, if the set time of the high-temperature sterilization mode is reached, the high-temperature sterilization mode is exited.
As an auxiliary control strategy, it is further preferable that the controller is further configured to set a low-loop-temperature compressor start frequency and a high-loop-temperature compressor start frequency according to the outdoor ambient temperature in the high-temperature sterilization mode to control the operation of the compressor, wherein the low-loop-temperature compressor start frequency is greater than the high-loop-temperature compressor start frequency.
Specifically, after entering the pasteurization mode, the sampled outdoor ambient temperature is compared to a startup threshold. The start-up threshold is less than the loop temperature threshold, which may be set at 10 ℃. And if the outdoor environment temperature is less than the starting threshold value, giving the low-ring-temperature compressor the starting frequency. And if the outdoor environment temperature is greater than or equal to the starting threshold, giving the starting frequency to the high-ambient-temperature compressor. That is, continuing with the numerical example of the above embodiment, when the outdoor ambient temperature is less than 10 ℃, the low-loop-temperature control strategy is selected to be executed, and the compressor start frequency is the low-loop-temperature compressor start frequency. And when the outdoor environment temperature is more than 10 ℃ and less than 25 ℃, selecting to execute a low-ring-temperature control strategy, wherein the starting frequency of the compressor is the starting frequency of the high-ring-temperature compressor. And when the outdoor environment temperature is more than 25 ℃, selecting to execute a high-loop-temperature control strategy, wherein the starting frequency of the compressor is the starting frequency of the high-loop-temperature compressor. Setting the starting frequency of two different compressors can further ensure that the air outlet temperature, the temperature of the fins of the indoor heat exchanger and the temperature of the pipeline can be more stably ensured to reach and continuously keep above 56 ℃ when the outdoor environment temperature is lower, and the high-temperature sterilization effect is realized. And when the outdoor environment temperature is higher, the condition that the exhaust temperature of the compressor exceeds the shutdown protection threshold value and enters a shutdown protection state due to outdoor high temperature is avoided, and the requirement that the high temperature lasts for 30 minutes is met.
Under the laboratory condition, the high-temperature sterilization mode is operated under the conditions that the indoor environment temperature is 20 ℃ and the outdoor environment temperature is 0-30 ℃, the air outlet temperature, the fin temperature and the pipeline temperature of the indoor heat exchanger can reach more than 56 ℃ and completely last for 30 minutes, and the operation effect and the stability are good through experimental tests.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An air conditioner comprising:
an indoor heat exchanger operating as a condenser or an evaporator;
an indoor fan for driving air to flow;
an outdoor heat exchanger operating as an evaporator or a condenser;
a compressor for discharging the compressed refrigerant into the condenser;
an outdoor fan for driving air to flow;
it is characterized by also comprising:
a controller configured to selectively perform a low-loop-temperature control strategy or a high-loop-temperature control strategy according to an outdoor ambient temperature to control the operation of the compressor in a high-temperature sterilization mode, wherein a target discharge pressure of the compressor set in the low-loop-temperature control strategy is greater than a target discharge pressure of the compressor set in the high-loop-temperature control strategy.
2. The air conditioner according to claim 1, wherein:
at least a first target exhaust pressure and a second target exhaust pressure which are increased in number are set in the low-ring-temperature control strategy; the controller is configured to control the compressor to operate at a first target exhaust pressure in a first stage after entering the high-temperature sterilization mode and executing the low-loop-temperature control strategy, and to control the compressor to operate at a second target exhaust pressure after the first stage.
3. The air conditioner according to claim 1 or 2, wherein:
the controller is configured to shorten a period for calculating an operating frequency of the compressor after entering the high-temperature sterilization mode and selecting the execution of the low-loop-temperature control strategy.
4. The air conditioner according to claim 1 or 2, wherein:
the controller is configured to reduce the magnitude of each adjustment of the compressor frequency after entering the high-temperature sterilization mode and selecting the execution of the low-loop-temperature control strategy.
5. The air conditioner according to claim 1 or 2, wherein:
the controller is configured to reduce the wind speed of the indoor fan after entering the high-temperature sterilization mode and selecting to execute the low-loop-temperature control strategy.
6. The air conditioner according to claim 1, wherein:
and the high-ambient-temperature control strategy calls a set target exhaust pressure corresponding to the indoor target temperature as the target compressor exhaust pressure set in the high-ambient-temperature control strategy.
7. The air conditioner according to claim 1 or 6, wherein:
the controller is configured to reduce the air speed of the indoor fan after entering a high-temperature sterilization mode and selecting to execute a high-loop-temperature control strategy; the controller is configured to sample an outdoor ambient temperature after reducing the wind speed of the indoor fan and increase the wind speed of the indoor fan to a maximum wind speed gear when the outdoor ambient temperature is above a load threshold.
8. The air conditioner according to claim 1 or 6, wherein:
the controller is configured to shorten a period of calculating an operating frequency of the compressor after entering the high-temperature sterilization mode and selecting to execute the high-loop-temperature control strategy.
9. The air conditioner according to claim 1 or 6, wherein:
the controller is configured to reduce the amplitude of each adjustment of the compressor frequency after entering the pasteurization mode and selecting execution of the high loop temperature control strategy.
10. The air conditioner according to claim 1, wherein:
the controller is further configured to set a low-loop-temperature compressor starting frequency and a high-loop-temperature compressor starting frequency according to the outdoor environment temperature to control the compressor to operate in a high-temperature sterilization mode, wherein the low-loop-temperature compressor starting frequency is greater than the high-loop-temperature compressor starting frequency.
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| CN202110173041.0A CN112797588A (en) | 2021-02-08 | 2021-02-08 | Air conditioner |
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| CN202110173041.0A CN112797588A (en) | 2021-02-08 | 2021-02-08 | Air conditioner |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113405234A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN113405235A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN113405233A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN113405238A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN115183304A (en) * | 2022-07-14 | 2022-10-14 | 珠海格力电器股份有限公司 | Control method and system for capillary network air-conditioning heating system |
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| CN111397128A (en) * | 2020-03-27 | 2020-07-10 | 广东美的制冷设备有限公司 | High-temperature sterilization method, frequency control method and air conditioner |
| CN111397125A (en) * | 2020-03-27 | 2020-07-10 | 广东美的制冷设备有限公司 | Sterilization control method and device of air conditioner, storage medium and control equipment |
| CN112178783A (en) * | 2020-09-22 | 2021-01-05 | 佛山市万物互联科技有限公司 | Air conditioner sterilization method and device, air conditioner and storage medium |
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| CN113405234A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
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| CN113405233A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN113405238A (en) * | 2021-06-25 | 2021-09-17 | 海信（山东）空调有限公司 | Air conditioner sterilization control method and device, air conditioner and storage medium |
| CN115183304A (en) * | 2022-07-14 | 2022-10-14 | 珠海格力电器股份有限公司 | Control method and system for capillary network air-conditioning heating system |
| CN115183304B (en) * | 2022-07-14 | 2024-04-02 | 珠海格力电器股份有限公司 | Control method and system for capillary network air conditioner heating system |
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Application publication date: 20210514 |