CN112413819A - Defrosting control method, controller, air conditioner, storage medium and terminal - Google Patents
Defrosting control method, controller, air conditioner, storage medium and terminal Download PDFInfo
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- CN112413819A CN112413819A CN202011140796.2A CN202011140796A CN112413819A CN 112413819 A CN112413819 A CN 112413819A CN 202011140796 A CN202011140796 A CN 202011140796A CN 112413819 A CN112413819 A CN 112413819A
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- defrosting
- air conditioner
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- temperature
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention belongs to the technical field of air conditioner control, and discloses a defrosting control method, a controller, an air conditioner, a storage medium and a terminal, wherein the running time, the power and the temperature of an inner pipe of an evaporator of the air conditioner are extracted as judgment parameters; the rate of change of operating power is monitored. The heating running time t1 refers to the stable running heating time of the air conditioner; the heating accumulated operation time t2 refers to the air conditioner accumulated operation heating time; detecting the running power PN every t interval time after the running time t1 or t 2; calculating power change rate in real time, preset power rate A, B; the temperature T inner tube of the evaporator inner tube is collected through an indoor tube temperature sensing bulb; and presetting an inner tube temperature T1, and judging whether the defrosting condition is entered. The invention can accurately identify whether the fixed-frequency air conditioner needs to enter into defrosting or not, defrosting is realized under the condition of low temperature and low humidity, defrosting is realized, defrosting is not realized, unnecessary defrosting times are reduced, and therefore, user experience is improved, and product quality is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioner control, and particularly relates to a defrosting control method, a controller, an air conditioner, a storage medium and a terminal.
Background
The low-temperature heating function of the heat pump air conditioner means that the air conditioner can perform heating work indoors under the condition of low external environment so as to improve the indoor environment temperature and ensure normal heating. When the surface temperature of the outdoor fin heat exchanger of the air source heat pump machine is lower than the air dew point temperature and lower than 0 ℃, the surface of the fin heat exchanger can frost, the frost increases the thermal resistance between air and fins, and meanwhile, the frost layer increases the air flow resistance, so that the heat exchange quantity of the air-cooled fin heat exchanger is reduced, the inner side heating quantity is reduced, and the heat pump air conditioner is required to realize the function of timely defrosting.
At present, the most common defrosting method of a fixed-frequency air conditioner is time-temperature timing control defrosting, but because the controllable parameters of the fixed-frequency air conditioner are less, the temperature difference of an inner pipe is easily affected by the repeated heat of an evaporator pipeline and the fluctuation change of the ambient temperature to cause mistaken defrosting (defrosting without defrosting) or frequent defrosting (defrosting starts when the defrosting is very thin) only by depending on the change of the temperature difference of the inner pipe and the running time, and particularly unnecessary defrosting can be generated under the conditions of low temperature and low humidity to cause heat loss and influence the comfort of users.
Compared with the patent CN110940055A, CN110940055A obtains the outdoor environment temperature, the air outlet temperature and the outer disc temperature; judging whether the conditions for entering a bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature; and if the condition of entering the bypass defrosting mode is met, opening a bypass control valve, and entering the bypass defrosting mode to prevent the outdoor heat exchanger from frosting, wherein the bypass control valve is connected with a throttling component of the air conditioner in parallel. According to the invention, by arranging the bypass loop, the temperature of the refrigerant entering the outdoor heat exchanger is gradually raised by mixing the high-temperature refrigerant with the throttled low-temperature refrigerant, so that the return air temperature is gradually raised, the frost layer is gradually melted, and the defrosting operation is realized under the condition that the compressor does not shut down.
Compared with the patent CN106288153A, CN106288153A is set by controlling the frequency of the compressor from the current operating frequency value f1 to the pre-defrosting operating value f, and the time of the frequency is t 1; then the frequency value of the compressor is maintained at the set operation value f set before defrosting for t2 time; and finally, reversing a four-way valve of the air conditioner, and enabling the air conditioner to enter a defrosting mode. In the scheme, before entering a defrosting mode, the total time length of the frequency raising and reducing process and the buffering process of the compressor is not less than the forced waiting time A, so that the most basic preparation time length before defrosting is ensured. And the preparation time before defrosting required for different compressors to enter the defrosting mode under different working conditions is no longer fixed time, so that the heating feeling on the user side is prevented from being deteriorated due to too long preparation time before defrosting, and the heating efficiency of the air conditioner in each heating cycle is improved.
Through the above analysis, the problems and defects of the prior art are as follows: for a fixed-frequency air conditioner, the controllable parameters are less, the mistaken defrosting is easy to occur under the condition of low temperature and low humidity according to the existing time-temperature timed defrosting mode, the mistaken defrosting (frostless defrosting) is easy to be caused by the repeated heat influence of an evaporator pipeline and the fluctuation change of the environmental temperature only depending on the change of the temperature difference of an inner pipe and the running time, or the defrosting is frequently carried out (the defrosting is started when the defrosting is very thin).
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a defrosting control method, a controller, an air conditioner, a storage medium and a terminal.
The invention is realized in such a way that a defrosting control method comprises the following steps:
extracting the running time, power and inner tube temperature of the evaporator of the air conditioner as judgment parameters;
the rate of change of operating power is monitored.
Further, the specific steps of extracting the running time, the power and the temperature of the inner pipe of the evaporator of the air conditioner as judgment parameters are as follows:
heating operation time t1, which refers to the stable operation heating time of the air conditioner;
heating accumulated operation time t2, which means air conditioner accumulated operation heating time;
detecting the running power PN once every t interval time after the running time t1 or t 2;
fourthly, calculating the power change rate delta PN (PN-PN +1)/2 in real time, and obtaining a preset power rate A, B;
collecting the temperature T inner tube of the evaporator inner tube through an indoor tube temperature sensing bulb;
sixthly, presetting an inner tube temperature T1, and judging whether defrosting conditions are entered.
Further, if the air conditioner is in a heating mode, after the air conditioner is started for a stable operation time period t1, or the air conditioner accumulates an operation time t2, an operation power P0 in a time t1 or a time t2 is recorded, the controller continuously detects the operation power of the whole air conditioner in a time t interval, and calculates a power change rate delta P which is respectively marked as delta P1, delta P2 and delta P3 … … delta PN.
Further, comparing the acquired deltA P with A preset power rate A, B, namely deltA P1-A, deltA P2-A, deltA P3-A … … deltA PN-A; delta P1-B, delta P2-B, and delta P3-B … … delta PN-B as judgment conditions;
if the deltA PN-A is more than or equal to 0 or the deltA PN-B is more than or equal to 0 for A continuous time A, judging whether the whole machine has windshield switching or not, and if the whole machine has windshield switching, detecting again according to the above;
if the power is reduced due to non-windshield conversion, detecting the temperature of the T inner pipe at the moment, and if the temperature of the T inner pipe is less than or equal to T1, detecting that defrosting is performed by the system;
if the temperature of the T inner tube is larger than T1, the system continues to continuously detect PN and calculates delta PN.
Furthermore, after the air conditioner enters defrosting, the temperature of the T inner tube is detected, if the temperature of the T inner tube is not less than T2, defrosting is exited, the whole machine returns to a heating mode, and the program enters detection again.
Further, in monitoring the change rate of the operating power, for a fixed frequency machine, the frosting condition of the whole machine is judged by using the power value through experimental data.
Further, the rate of decrease of power is monitored to identify whether defrosting operation is required.
Another object of the present invention is to provide a controller for an air conditioner, wherein the controller performs a defrosting control method during a defrosting process.
Another object of the present invention is to provide an air conditioner applied to a constant frequency air conditioner, the air conditioner having the controller according to claim 7 mounted thereon.
Another object of the present invention is to provide a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to execute the defrosting control method.
Another object of the present invention is to provide an information data processing terminal for implementing the defrosting control method.
By combining all the technical schemes, the invention has the advantages and positive effects that:
by using the detection control method, whether the fixed-frequency air conditioner needs to enter into defrosting or not can be accurately identified, defrosting is realized under the condition of low temperature and low humidity, defrosting is realized, defrosting is not realized, and unnecessary defrosting times are reduced, so that the user experience is improved, and the product quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a flowchart of a defrosting control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a defrosting control method, a controller, an air conditioner, a storage medium and a terminal, and the present invention is described in detail below with reference to the accompanying drawings.
As shown in figure 1, the invention provides a control method for controlling defrosting of a fixed-frequency air conditioner based on power rate, by extracting the running time and power of the air conditioner and the temperature of an inner pipe of an evaporator as judgment parameters, and by monitoring the change rate of the running power, the outer heat exchange quantity is reduced along with the increase of the thickness of a frost layer of an air-cooled fin heat exchanger at the outdoor side, so that the running power of the whole air conditioner is reduced, the power can intuitively feed back the working state of the system, for the fixed-frequency air conditioner, because controllable parameters are few, the temperature of a liquid pipe is not arranged at the outer side, the judgment is only carried out according to the temperature difference of the inner pipe and the running time according to the conventional defrosting logic, the temperature of the inner pipe is easily influenced by the temperature difference of the evaporator pipeline, so that. Through relevant experimental data, can utilize the power value to judge the condition of frosting of complete machine, the rate of reduction of monitoring power can more accurately discern whether need change the frost work, effectively reduces the number of times of changing the frost under the low temperature low humidity condition, accomplishes to have the frost to change the frost, and frostless does not change, reduces the product energy consumption, promotes user's travelling comfort.
Specifically, the control function is realized by the following detection control method.
The letter symbols of the flow chart illustrate that:
the heating operation time t1 refers to a stable operation heating time of the air conditioner, and may be set to t1 ═ 16min, for example;
the heating accumulated operation time t2 refers to the air conditioner accumulated operation heating time, and may be set to t2 ═ 25min, for example;
detecting the running power PN once every t interval time after the running time t1 or t 2;
fourthly, calculating the power change rate Δ PN in real time as (PN-PN +1)/2, and setting a preset power rate A, B to be 3 and 25, for example;
collecting the temperature T inner tube of the evaporator inner tube through an indoor tube temperature sensing bulb;
sixthly, presetting an inner tube temperature T1, and judging whether defrosting conditions are entered;
the air conditioner is in a heating mode, after the air conditioner is started for a stable operation time t1, or the air conditioner accumulates an operation time t2, an operation power P0 in a time t1 or a time t2 is recorded, the controller continuously detects the operation power of the whole machine in a time t interval, and calculates a power change rate delta P which is respectively marked as delta P1, delta P2 and delta P3 … … delta PN;
comparing the acquired deltA P with A preset power rate A, B, namely deltA P1-A, deltA P2-A, deltA P3-A … … deltA PN-A; the judgment conditions are deltA P1-B, deltA P2-B and deltA P3-B … … deltA PN-B, if deltA PN-A is more than or equal to 0 for A continuous time A, or deltA PN-B is more than or equal to 0, whether the whole machine has windshield switching is judged, and if the whole machine has windshield switching, the detection is carried out again as described above; if the power is reduced due to non-windshield conversion, detecting the temperature of the T inner pipe at the moment, and if the temperature of the T inner pipe is less than or equal to T1, detecting that defrosting is performed by the system; if the temperature of the T inner tube is greater than T1, the system continuously detects PN and calculates delta PN;
and after the air conditioner enters defrosting, detecting the temperature of the T inner tube, if the temperature of the T inner tube is not less than T2, exiting defrosting, turning the whole machine back to a heating mode, and detecting the program again.
In this way, whether the whole machine defrosts is controlled according to the power change rate, and the optimal defrosting effect is ensured;
the in-application test data were as follows:
the 2 more extreme working conditions are tested as above, the defrosting logic can be met, and defrosting can be carried out in time.
The scheme is that the running time, the power and the temperature of an inner pipe of the evaporator are extracted as judgment parameters, and for the fixed-frequency machine, because the frequency of the compressor is kept unchanged all the time, in practice, when the outer-side heat exchanger is not frosted, the running power of the whole machine can be basically kept in a fluctuation interval, the continuous running time of the air conditioner can not be extracted, the running power of the air conditioner is directly detected all the time, and the function of timely defrosting can also be realized.
The power detection is abnormal because whether the used air conditioner is just started or not cannot be confirmed to be influenced by voltage impact and the like, and the misdetection of defrosting and frosting of the system can be caused due to the fact that the running time is not detected, so that the defrosting function is good without the scheme.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A defrosting control method is characterized by being applied to an air conditioner and comprising the following steps:
extracting the running time, power and inner tube temperature parameters of the evaporator of the air conditioner; and monitoring the extracted parameters to obtain the change rate of the operating power.
2. The method for controlling defrosting according to claim 1, wherein the extracting of the operating time, power, and evaporator inner tube temperature parameters of the air conditioner comprises:
heating operation time t1, which refers to the stable operation heating time of the air conditioner;
heating accumulated operation time t2, which means air conditioner accumulated operation heating time;
detecting the running power PN once every t interval time after the running time t1 or t 2;
fourthly, calculating the power change rate delta PN (PN-PN +1)/2 in real time, and obtaining a preset power rate A, B;
collecting the temperature T inner tube of the evaporator inner tube through an indoor tube temperature sensing bulb;
sixthly, presetting an inner tube temperature T1, and judging whether defrosting conditions are entered.
3. The defrosting control method according to claim 2, wherein if the air conditioner is in a heating mode, after the air conditioner is started for a stable operation time period t1, or the air conditioner accumulates an operation time t2, an operation power P0 in a time t1 or a time t2 is recorded, the controller continuously detects the operation power of the whole machine in a time t interval, and calculates a power change rate Δ P, which is respectively marked as Δ P1, Δ P2, and Δ P3 … … Δ PN.
4. The method of claim 3, wherein the captured Δ P is compared to A predetermined power rate A, B, i.e., Δ P1-A, Δ P2-A, Δ P3-A … … Δ PN-A; delta P1-B, delta P2-B, and delta P3-B … … delta PN-B as judgment conditions;
if the deltA PN-A is more than or equal to 0 or the deltA PN-B is more than or equal to 0 for A continuous time A, judging whether the whole machine has windshield switching or not, and if the whole machine has windshield switching, detecting again according to the above;
if the power is reduced due to non-windshield conversion, detecting the temperature of the T inner pipe at the moment, and if the temperature of the T inner pipe is less than or equal to T1, detecting that defrosting is performed by the system;
if the temperature of the T inner tube is larger than T1, the system continues to continuously detect PN and calculates delta PN.
5. The defrosting control method of claim 2 wherein the temperature of the T inner tube is detected if the air conditioner enters defrosting, and the defrosting is exited if the temperature of the T inner tube is greater than or equal to T2, the whole machine returns to the heating mode, and the program re-enters detection.
6. The defrosting control method according to claim 1, wherein the extracted parameters are monitored to obtain a change rate of operating power, and for a fixed frequency machine, a power value is used to judge the frosting condition of the whole machine through experimental data; defrosting is performed when the power rate is reduced.
7. A controller, which is applied to an air conditioner, and performs the defrosting control method according to any one of claims 1 to 6 in a defrosting program.
8. An air conditioner, which is applied to a constant frequency air conditioner, and which is equipped with the controller according to claim 7.
9. A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to execute the defrosting control method according to any one of claims 1 to 6.
10. An information data processing terminal, characterized in that the information data processing terminal is used for realizing the defrosting control method of any one of claims 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011140796.2A CN112413819A (en) | 2020-10-22 | 2020-10-22 | Defrosting control method, controller, air conditioner, storage medium and terminal |
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| CN202011140796.2A CN112413819A (en) | 2020-10-22 | 2020-10-22 | Defrosting control method, controller, air conditioner, storage medium and terminal |
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| CN113203182A (en) * | 2021-04-26 | 2021-08-03 | 广东美的暖通设备有限公司 | Defrosting control method and device for air conditioner, air conditioner and storage medium |
| CN113483510A (en) * | 2021-07-20 | 2021-10-08 | 贵州省建筑设计研究院有限责任公司 | Defrosting start-stop control method for air source heat pump |
| CN113561734A (en) * | 2021-08-24 | 2021-10-29 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, automobile air conditioner, storage medium and processor |
| CN113739464A (en) * | 2021-08-16 | 2021-12-03 | 珠海格力电器股份有限公司 | Method and device for controlling defrosting of direct expansion unit and related equipment |
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Application publication date: 20210226 |