CN114353257B - Overshoot protection method and device and air conditioner - Google Patents
Overshoot protection method and device and air conditioner Download PDFInfo
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- CN114353257B CN114353257B CN202210096189.3A CN202210096189A CN114353257B CN 114353257 B CN114353257 B CN 114353257B CN 202210096189 A CN202210096189 A CN 202210096189A CN 114353257 B CN114353257 B CN 114353257B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000007791 dehumidification Methods 0.000 claims abstract description 8
- 238000005057 refrigeration Methods 0.000 claims abstract description 8
- 238000009423 ventilation Methods 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 description 25
- 230000000694 effects Effects 0.000 description 15
- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000000191 radiation effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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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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Abstract
The invention provides an overshoot protection method and device and an air conditioner, and relates to the technical field of air conditioners. The overshoot protection method can judge whether the outer disc of the air conditioner has temperature overshoot according to the first outer disc temperature value, the second outer disc temperature value, the third outer disc temperature value and the outer disc temperature value at one moment in the first preset time of the air conditioner running in the refrigeration mode or the dehumidification mode. When the condition that the temperature of the outer disc overshoots is judged, the running frequencies of the outer fan and the compressor can be determined according to the third outer disc temperature value, so that the condition that the temperature of the outer disc overshoots is improved. The overshoot protection device and the air conditioner provided by the invention can execute the overshoot protection method. The overshoot protection method and device and the air conditioner can solve the problem that the temperature of the outer disc is easy to overshoot due to poor ventilation of the air conditioner outer machine.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an overshoot protection method and device and an air conditioner.
Background
The conventional variable frequency air conditioner can realize basic functions such as refrigeration and dehumidification, an outdoor air conditioner grid structure appears for satisfying the attractive appearance of a building, a new requirement is provided for the installation environment of an air conditioner outdoor unit, the air conditioner outdoor unit is installed in a district with the air conditioner grid, the air conditioner can influence the normal heat exchange of an outdoor condenser due to the bad ventilation of the outdoor unit, and then the temperature overshoot risk of the outdoor plate of the air conditioner is caused, the operation stability of the air conditioner and the service life of a compressor are influenced, the effect is poor, and the power consumption is increased.
Disclosure of Invention
The invention solves the problem of how to improve the problem of temperature overshoot of an outer disc, which is easy to cause by poor ventilation of an air conditioner outer machine.
In order to solve the above problems, the present invention provides an overshoot protection method, which is applied to an air conditioner, and includes:
when the running time of the air conditioner in a refrigeration mode or a dehumidification mode reaches a first preset time, a first outer disc temperature value at a first moment, a second outer disc temperature value and an outer disc temperature value at a second moment and a third outer disc temperature value at a third moment are obtained; the first time, the second time and the third time are time points sequentially passing in the first preset time, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are temperatures of a heat exchanger in an air conditioner outer unit, and the outer ring temperature value is a temperature of an external environment where the air conditioner outer unit is located;
Judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots or not according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value;
and if the judging result is that the temperature of the heat exchanger of the air conditioner external unit overshoots, determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value.
Compared with the prior art, the overshoot protection method provided by the invention has the beneficial effects that:
the overshoot protection method can be used for monitoring the temperatures of the outer discs at different moments and the outer ring temperature value at one moment in the first preset time when the air conditioner runs in a refrigerating mode or a dehumidifying mode to reach the first preset time, and can accurately judge whether the temperature of the outer discs overshoots or not according to the outer ring temperature value and the outer disc temperatures. If the outer disc has temperature overshoot, the outer fan and the compressor are controlled to redetermine the operation parameters so as to improve the heat dissipation effect of the air conditioner outer machine, and improve the poor heat dissipation of the air conditioner outer machine caused by the temperature overshoot of the outer disc, so that the operation stability of the air conditioner is poor and the service life of the compressor is shortened. Based on the above, the overshoot protection method provided by the invention can solve the problem of easy temperature overshoot of the outer disc caused by poor ventilation of the air conditioner outer unit.
Optionally, the step of determining whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value includes:
calculating a second outer disc temperature value to subtract the outer ring temperature value to obtain a first temperature difference value;
judging whether the first temperature difference value is larger than or equal to a first preset value;
if the first temperature difference value is smaller than the first preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot;
and if the first temperature difference value is larger than or equal to the first preset value, judging whether the temperature of the heat exchanger of the air conditioner external unit overshoots or not according to the first external disc temperature value, the second external disc temperature value and the third external disc temperature value.
The condition that whether the temperature of the outer disc overshoots is primarily judged through the second outer disc temperature value and the outer ring temperature value at the second moment, if the judgment result is that the first temperature difference value is larger than or equal to the first preset value, the condition that the temperature of the outer disc overshoots is likely to occur is primarily judged, and based on the condition, judgment is conducted again through the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value, so that the accuracy of judging whether the temperature of the outer disc overshoots is improved.
Optionally, the step of judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots according to the first outdoor unit temperature value, the second outdoor unit temperature value and the third outdoor unit temperature value includes:
calculating a second outer disc temperature value to subtract the first outer disc temperature value to obtain a second temperature difference value;
judging whether the second temperature difference value is larger than or equal to a second preset value;
if the second temperature difference value is smaller than the second preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot;
and if the second temperature difference value is larger than or equal to the second preset value, judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots or not according to the third outdoor unit temperature value.
The first outer disc temperature value and the second outer disc temperature value are used for carrying out secondary judgment, and under the condition that the outer disc temperature overshoot is likely to occur in the secondary judgment result, whether the outer disc temperature overshoot occurs or not is judged according to the third outer disc temperature value, so that the judgment accuracy can be further improved.
Optionally, the step of determining whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots according to the third outdoor unit temperature value includes:
judging whether the temperature value of the third outer disc is smaller than a first temperature threshold value or not;
If the third outer disc temperature value is smaller than the first temperature threshold value, the heat exchanger of the air conditioner outer unit does not have temperature overshoot;
and if the temperature value of the third outer disc is greater than or equal to the first temperature threshold value, the heat exchanger of the air conditioner outer unit is subjected to temperature overshoot.
Optionally, the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value includes:
if the third outer disc temperature value is greater than or equal to a first temperature threshold value and less than a second temperature threshold value, controlling the outer fan to maintain the current rotating speed, controlling the compressor to reduce the operating frequency to a first preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate;
if the third outer disc temperature value is greater than or equal to the second temperature threshold value and smaller than the third temperature threshold value, controlling the rotating speed of the outer fan to increase the preset rotating speed, controlling the compressor to reduce the operating frequency to a second preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate;
and if the third outer disc temperature value is greater than or equal to the third temperature threshold value, controlling the rotating speed of the outer fan to be increased to the highest rotating speed, controlling the compressor to reduce the running frequency to a third preset proportion of the current running frequency, and controlling the compressor to reduce the frequency raising rate.
The heat generated by the air conditioner external unit can be reduced by reducing the running frequency of the compressor and the frequency-raising rate of the compressor; meanwhile, the heat radiation effect on the air conditioner external unit can be improved by improving the rotating speed of the external fan, so that the problem of temperature overshoot of the external disk caused by poor ventilation of the air conditioner external unit is solved.
Optionally, the first preset proportion is greater than the second preset proportion, and the second preset proportion is greater than the third preset proportion.
Optionally, the step of controlling the compressor to reduce the rate of the up-conversion includes:
and controlling the frequency raising rate of the compressor to be halved.
Optionally, after the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value if the judgment result is that the temperature of the heat exchanger of the air conditioner is overshot, the overshoot protection method further includes:
maintaining the air conditioner to operate for a second preset time;
and controlling the operation parameters of the external fan and the compressor to be adjusted to the operation parameters before the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value.
An overshoot protection device for an air conditioner, the overshoot protection device comprising:
The acquisition module is used for acquiring a first outer disc temperature value at a first moment, a second outer disc temperature value and an outer ring temperature value at a second moment and a third outer disc temperature value at a third moment when the running time of the air conditioner in a state of a refrigeration mode or a dehumidification mode reaches a first preset time; the first time, the second time and the third time are time points sequentially passing in the first preset time, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are temperatures of a heat exchanger in an air conditioner outer unit, and the outer ring temperature value is a temperature of an external environment where the air conditioner outer unit is located;
the judging module is used for judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots or not according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value;
and the control module is used for determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value when the judging result of the judging module is that the temperature of the heat exchanger of the air conditioner is overshot.
An air conditioner comprises a controller for executing the overshoot protection method.
The overshoot protection device and the air conditioner provided by the application can execute the overshoot protection method, so that the overshoot protection device and the air conditioner have the same beneficial effects as the overshoot protection method in the prior art, and are not repeated herein.
Drawings
Fig. 1 is a flowchart of an overshoot protection method provided in an embodiment of the present application;
fig. 2 is a flowchart of step S20 in the anti-overshoot protection method according to the embodiment of the present application;
fig. 3 is a flowchart of step S240 in the anti-overshoot protection method according to the embodiment of the present application;
fig. 4 is a flowchart of step S244 in the anti-overshoot protection method according to the embodiment of the present application;
fig. 5 is a flowchart of step S30 in the overshoot protection method according to the embodiment of the present application;
fig. 6 is a schematic diagram of a functional module of an overshoot protection device according to an embodiment of the present application.
Reference numerals illustrate:
10-an overshoot protection device; 11-an acquisition module; 12, a judging module; 13-control module.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
And the air conditioner is used for improving the air quality of the environment where the user is located, so that the comfort level of the environment where the user is located is improved. The air conditioner comprises an air conditioner inner unit and an air conditioner outer unit, wherein the air conditioner inner unit is installed in an environment where a user is located, and the air conditioner outer unit is installed in an external environment outside the environment where the user is located. The air conditioner inner unit is connected with the air conditioner outer unit, and the refrigerant can circulate in the air conditioner inner unit and the air conditioner outer unit. Under the condition of a refrigeration mode or a dehumidification mode, a compressor in the air conditioner external unit guides the refrigerant compressed by the compressor to a heat exchanger in the air conditioner external unit, and the refrigerant passes through an expansion valve and the heat exchanger in the air conditioner internal unit after being guided out of the heat exchanger in the air conditioner external unit and then returns to the compressor, so that circulation is formed. Similarly, in the case of the heating mode, the compressor in the air conditioner external unit guides the refrigerant compressed by the compressor to the heat exchanger in the air conditioner internal unit, and the refrigerant passes through the expansion valve and the heat exchanger in the air conditioner external unit after being guided out of the heat exchanger in the air conditioner internal unit, and then returns to the compressor, thereby forming a cycle.
In the case of the air conditioner operating in a cooling mode or a dehumidifying mode, a heat exchanger in the air conditioner external unit is used to provide a cooling effect to a high-temperature and high-pressure refrigerant. In the prior art, the air conditioner external unit is usually installed in an inner space formed by a grid structure of a building, and because the ventilation effect is poor in the inner space formed by the grid structure, the heat dissipation of the air conditioner external unit is poor, so that the normal heat exchange of a heat exchanger in the air conditioner external unit is influenced, the heat exchanger of the air conditioner external unit is enabled to have the temperature overshoot, the stability of the normal operation of the air conditioner is influenced, and the service life of a compressor is also influenced.
In order to improve the above technical problems, that is, in order to solve the problem of overshoot of the temperature of the outer disc, which is easily caused by poor heat dissipation of the air conditioner in the prior art, an overshoot protection method applied to the air conditioner is provided. The method can be executed by the air conditioner, and the condition that the temperature of the heat exchanger of the air conditioner external unit is overshot can be improved. It should be noted that, when the anti-overshoot protection method is executed by the air conditioner, the external fan and the compressor of the air conditioner can be controlled to determine the operation parameters so as to improve the condition that the heat exchanger of the air conditioner external machine overshoots. Wherein "determining an operating parameter" means that at least one of the external fan and the compressor can be controlled to adjust the operating parameter to operate or at least one of the external fan and the compressor can be controlled to maintain the current operating parameter to operate.
In order to execute the overshoot protection method, the air conditioner further comprises an outer disk temperature detection device, an outer ring temperature detection device and a controller. The outer disc temperature detection device is arranged on the heat exchanger of the air conditioner outer machine and is used for detecting the coil temperature of the heat exchanger of the air conditioner outer machine. The outer ring temperature detection device is arranged on the air conditioner external unit and is used for detecting the temperature of the external environment where the air conditioner external unit is located. The outer disc temperature detection device and the outer ring temperature detection device are electrically connected with the controller, the outer disc temperature detection device can send the detected temperature value to the controller, and the outer ring temperature detection device can also send the detected temperature value to the controller.
It should be noted that, the existing air conditioner generally includes the outer disc temperature detecting device and the outer ring temperature detecting device, so that no additional sensor or other detecting device is needed to perform the overshoot protection method, the cost of performing the overshoot protection method can be reduced, and based on this, the overshoot protection method can be easily implemented.
In addition, the controller may be an integrated circuit chip with signal processing capabilities. The controller may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a single-chip microcomputer, a micro-control unit (Microcontroller Unit, MCU), a complex programmable logic device (Complex Programmable Logic Device, CPLD), a Field-programmable gate array (Field-Programmable Gate Array, FPGA), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an embedded ARM, or other chips, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application.
In a possible implementation manner, the air conditioner may further include a memory, where the program instructions may be stored for the controller to execute, for example, the overshoot protection device 10 provided in the embodiment of the present application, where the overshoot protection device 10 provided in the embodiment of the present application includes at least one of the at least one overshoot protection device and the at least one overshoot protection device may be stored in the memory in a form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, random access Memory (Random Access Memory, RAM), read Only Memory (ROM), programmable Read Only Memory (Programmable Read-Only Memory, PROM), erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM). The memory may also be provided integrally with the controller, e.g. the memory may be provided integrally with the controller in the same chip.
Referring to fig. 1, based on the above-mentioned air conditioner, the overshoot protection method provided in the embodiment of the present application may include:
step S10, when the running time of the air conditioner in the refrigeration mode or the dehumidification mode reaches a first preset time, a first outer disc temperature value at a first moment, a second outer disc temperature value and an outer disc temperature value at a second moment and a third outer disc temperature value at a third moment are obtained.
Alternatively, the value range of the first preset time may be 0-5min, in other words, the value of the first preset time may be 30s, 45s, 1min, 75s, 100s, 2min, 150s, 3min, 210s, 4min, or 270s, etc.
The first time, the second time and the third time are time points which sequentially pass through in a first preset time. For example, when the first preset time is 3min, the first time may be the time at which 0s is located, that is, the time when the air conditioner just starts to operate in the heating mode; the second time can be the time at which 120s is located, namely the time when the air conditioner is operated in a heating mode for 2 min; the third time may be the time at which 180s is located, that is, the time at which the air conditioner is operated in the heating mode for 3 min. Of course, in other embodiments of the present application, at least one of the first time, the second time, and the third time may also be selected from other different times. For example, the first time is a time at which 60s is located, the second time is a time at which 150s is located, the third time is a time at which 180s is located, and so on.
In addition, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are outer disc temperatures detected by the outer disc temperature detection device at different times, wherein the first outer disc temperature value represents the outer disc temperature detected by the outer disc temperature detection device at the first time, the second outer disc temperature value represents the outer disc temperature detected by the outer disc temperature detection device at the second time, and the third outer disc temperature value represents the outer disc temperature detected by the outer disc temperature detection device at the third time. The outer ring temperature value then represents the temperature of the external environment detected by the outer ring temperature detection means at the second instant.
And S20, judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots or not according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value.
In other words, the temperature change condition of the air conditioner external unit in the first preset time can be judged according to the plurality of external disk temperatures at different moments and the external ring temperature at one moment, so that whether the air conditioner external unit has the temperature overshoot condition caused by poor heat dissipation is accurately judged.
Optionally, referring to fig. 2, step S20 may include:
step S210, calculating a first temperature difference value by subtracting the outer ring temperature value from the second outer ring temperature value.
Step S220, judging whether the first temperature difference is greater than or equal to a first preset value.
Step S230, if the first temperature difference is smaller than a first preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot.
Step S230 may be regarded as a step S220 of determining that the heat exchanger of the outdoor unit of the air conditioner does not have temperature overshoot.
And step 240, if the first temperature difference is greater than or equal to the first preset value, judging whether the temperature of the heat exchanger of the air conditioner external unit overshoots or not according to the first external disc temperature value, the second external disc temperature value and the third external disc temperature value.
Step S240 may also be regarded as determining whether the heat exchanger of the air conditioner outdoor unit is in temperature overshoot according to the first outdoor unit temperature value, the second outdoor unit temperature value, and the third outdoor unit temperature value when the determination result of step S220 is yes.
It should be noted that, whether the heat dissipation condition of the air conditioner outdoor unit is stable can be determined by the difference value between the second outdoor unit temperature value and the outer ring temperature value at the second moment. Under the general condition that the air conditioner operates in a heating mode, the temperature of the air conditioner external unit is higher than the temperature of the external environment, and if the heat dissipation condition of the air conditioner external unit is good, the difference between the temperature of the heat exchanger of the air conditioner external unit and the temperature of the external environment is not too large, so that whether the heat dissipation condition of the air conditioner external unit is stable can be judged through the temperature of the external tray and the temperature of the external environment at the same moment.
It should be understood that in other embodiments of the application, other times of the outer disc temperature and the temperature of the external environment may be employed. It should be noted that, under the condition that the air conditioner just operates in the heating mode, the temperature of the outer disc is still in a stage of rapid rising, and meanwhile, considering the hysteresis of the temperature, when the temperature of the outer disc and the temperature of the external environment at the same time are selected to determine whether the heat dissipation condition of the air conditioner outer machine is stable, the temperature of the outer disc and the temperature of the external environment at a certain time after the air conditioner operates in the heating mode should be selected.
In addition, whether the heat dissipation condition of the air conditioner external unit is stable or not is judged through the temperature difference between the second external disk temperature value and the external disk temperature value at the second moment, and the step can be regarded as the condition of preliminarily judging whether the temperature overshoot occurs in the heat exchanger of the air conditioner external unit or not. If the first temperature difference value is smaller than a first preset value, the heat dissipation condition of the heat exchanger of the air conditioner external unit is good, namely, the condition that the temperature of the heat exchanger of the air conditioner external unit overshoots does not occur; if the first temperature difference value is larger than or equal to a first preset value, the heat dissipation condition of the heat exchanger of the air conditioner external unit is poor, namely, the condition that the heat exchanger of the air conditioner external unit possibly has temperature overshoot is primarily judged.
Alternatively, in some embodiments of the present application, the first preset value may be in the range of 6 ℃ to 10 ℃; in other words, the first preset value may be 6 ℃, 7 ℃, 8 ℃, 9 ℃, 10 ℃, or the like. It is worth to say that, according to the data obtained by the test before the air conditioner is manufactured and shipped, the difference between the temperature of the outer disc and the temperature of the external environment under the general working condition of the air conditioner is more met under the condition that the value of the first preset value is 8 ℃, in other words, the heat dissipation condition of the heat exchanger of the air conditioner is judged to be good or not more accurately.
After the preliminary determination in step S210 and step S220, whether the heat exchanger of the air conditioner external unit has a temperature overshoot may be preliminarily determined, and in the case that the air conditioner external unit may have a temperature overshoot, the accuracy of determining whether the air conditioner external unit has a temperature overshoot may be improved after the determination in step S240.
Optionally, referring to fig. 3, step S240 may include:
and S241, calculating a second outer disc temperature value to subtract the first outer disc temperature value to obtain a second temperature difference value.
Step S242, determining whether the second temperature difference is greater than or equal to a second preset value.
Step S243, if the second temperature difference is smaller than the second preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot.
And step 244, if the second temperature difference is greater than or equal to the second preset value, judging whether the temperature of the heat exchanger of the air conditioner outdoor unit is overshot according to the third outdoor unit temperature value.
Step S243 may be regarded as a step S242 of determining that the heat exchanger of the outdoor unit of the air conditioner does not have temperature overshoot if the determination result is no; step S244 may also be regarded as determining whether the heat exchanger of the air conditioner outdoor unit is temperature-overshot according to the third outdoor unit temperature value when the determination result of step S242 is yes.
It should be noted that, when the preliminary judgment in step S210 and step S220 indicates that the heat exchanger of the air conditioner external unit may have a temperature overshoot, the change condition of the external disc temperature may be judged by the temperatures of the heat exchanger of the air conditioner external unit at different moments within the first preset time, and whether the heat exchanger of the air conditioner external unit has a temperature overshoot is performed based on the change condition of the external disc temperature, so that the accuracy of the judgment may be improved.
If the difference between the first outer disc temperature value and the second outer disc temperature value is larger, namely the second temperature difference is larger, the temperature rise of the heat exchanger of the air conditioner outer machine is larger, so that the heat dissipation effect of the heat exchanger of the air conditioner outer machine is indirectly reflected to be poorer; on the contrary, if the difference between the first outer disc temperature value and the second outer disc temperature value is smaller, that is, the second temperature difference is smaller, the temperature rise of the heat exchanger of the air conditioner outer unit is smaller, so that the heat dissipation effect of the heat exchanger of the air conditioner outer unit is better in an indirect reflection mode. Therefore, based on the above situation, whether the heat dissipation situation of the heat exchanger of the air conditioner external unit is stable or not can be judged secondarily, and the judgment accuracy is improved. Based on this, in step S243, it is indicated that the second temperature difference is smaller, and therefore, it is possible to obtain that the heat exchanger of the external air conditioner does not have temperature overshoot; in step S244, the second temperature difference is larger, so that it is possible to obtain that the heat exchanger of the outdoor unit of the air conditioner may have temperature overshooting.
Alternatively, in some embodiments of the present application, the second preset value may be in the range of 8 ℃ to 12 ℃; in other words, the second preset value may be 8 ℃, 9 ℃, 10 ℃, 11 ℃, 12 ℃, or the like. It should be noted that, when the first time is 0s and the second time is 120s, the value of the second preset value is 10 ℃, which more accords with the temperature rising condition of the heat exchanger of the air conditioner external unit under the normal heat dissipation condition, in other words, when the first time is 0s and the second time is 120s, and when the value of the second preset value is 10 ℃, the accuracy of judging whether the temperature overshoot occurs in the heat exchanger of the air conditioner external unit is higher.
After the secondary judgment is performed through the difference between the first outside plate temperature value and the second outside plate temperature value, in order to further improve the judgment accuracy, whether the temperature overshoot condition occurs in the heat exchanger of the air conditioner outside machine may be judged according to the third outside plate temperature value, in other words, after the secondary judgment in step S241 and step S242 is performed, the judgment accuracy may be improved through the secondary judgment in step S244.
Optionally, referring to fig. 4, step S244 may include:
step S201, determining whether the third outer disc temperature value is less than the first temperature threshold.
Step S202, if the temperature value of the third outer disc is smaller than the first temperature threshold value, the heat exchanger of the air conditioner outer unit does not have temperature overshoot.
Step 203, if the third outer disc temperature value is greater than or equal to the first temperature threshold, a temperature overshoot occurs in the heat exchanger of the air conditioner.
Step S202 may be regarded as that when the determination result in step S201 is no, it is obtained that the heat exchanger of the air conditioner external unit does not have temperature overshoot; step S203 may also be regarded as a step S201 of determining that the heat exchanger of the air conditioner external unit is in temperature overshoot.
It should be noted that, if the above primary judgment and the secondary judgment show that the heat exchanger of the air conditioner external unit may have a temperature overshoot, when the specific value of the third external disk temperature value is also higher, the temperature of the heat exchanger of the air conditioner external unit is higher, which reflects that the heat dissipation effect of the heat exchanger of the air conditioner external unit is worse, so that the heat exchanger of the air conditioner external unit has an overshoot risk. Of course, if the third outdoor unit temperature value is smaller than the first temperature threshold value, it indicates that the temperature value of the outdoor unit of the air conditioner is lower, and at this time, it indicates that the heat exchanger of the outdoor unit of the air conditioner does not have temperature overshoot.
Above-mentioned, carry out preliminary judgement through first outer dish temperature value and outer loop temperature value, carry out the secondary through first outer dish temperature value and second outer dish temperature value again and judge once more through third outer dish temperature value, in other words, through the condition of judging whether temperature overshooting appears in the heat exchanger of the outer machine of air conditioner many times, can improve and judge the precision, improve the condition that appears erroneous judgement.
When the condition that the temperature of the heat exchanger of the air conditioner external unit is overshot is obtained through the judgment, the operation parameters of the external fan and the compressor of the air conditioner external unit are required to be redetermined, so that the heat dissipation effect of the air conditioner external unit is improved, and the condition that the temperature of the heat exchanger of the air conditioner external unit is overshot is improved.
In other words, referring to fig. 1, after step S20, the anti-overshoot protection method further includes:
and step S30, if the judging result is that the temperature of the heat exchanger of the air conditioner outdoor unit overshoots, determining the operation parameters of the outdoor fan and the compressor of the air conditioner according to the third outdoor unit temperature value.
Optionally, referring to fig. 5, step S30 may include:
and step S310, if the temperature value of the third outer disk is greater than or equal to the first temperature threshold value and less than the second temperature threshold value, controlling the outer fan to maintain the current rotating speed, controlling the compressor to reduce the operating frequency to a first preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate.
Step S320, if the third outer disk temperature value is greater than or equal to the second temperature threshold value and less than the third temperature threshold value, controlling the rotating speed of the outer fan to increase the preset rotating speed, controlling the compressor to reduce the operating frequency to a second preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate.
And step S330, if the temperature value of the third outer disk is greater than or equal to the third temperature threshold value, controlling the rotating speed of the outer fan to be increased to the highest rotating speed, controlling the compressor to reduce the operating frequency to be a third preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate.
The sequence of steps S310, S320 and S330 is not limited, and when any one of the conditions is satisfied, the corresponding step may be executed.
In steps S310 to S330, the heat generated by the air conditioner external unit may be reduced by reducing the operating frequency of the compressor and the frequency raising rate of the compressor; meanwhile, the heat radiation effect on the air conditioner external unit can be improved by improving the rotating speed of the external fan, so that the problem of temperature overshoot of the external disk caused by poor ventilation of the air conditioner external unit is solved.
It should be noted that, in step S310, if the third external disk temperature value is greater than or equal to the first temperature threshold and less than the second temperature threshold, the difference between the temperature of the heat exchanger of the external air conditioner and the first temperature threshold is smaller, which indicates that the temperature overshoot is not serious, based on which the current rotation speed of the fan can be maintained, and the compressor is controlled to reduce the operation frequency and the frequency raising rate to reduce the heat generated by the external air conditioner. In step S320, if the third external disk temperature value is greater than or equal to the second temperature threshold and less than the third temperature threshold, the temperature of the heat exchanger of the external air conditioner is higher, and the temperature overshoot is serious, and at this time, the rotation speed of the external fan needs to be increased to improve the heat dissipation effect, and the operation frequency and the frequency-up rate of the compressor are reduced to reduce the heat generated by the external air conditioner, thereby improving the temperature overshoot. In step S330, if the third external disk temperature value is greater than or equal to the third temperature threshold, it indicates that the temperature overshoot occurs in the heat exchanger of the external air conditioner, so that the rotation speed of the external fan needs to be increased to the maximum rotation speed, and the operation frequency and the frequency-increasing rate of the compressor need to be controlled to be reduced, so as to improve the temperature overshoot problem.
Alternatively, in some embodiments of the present application, based on the above, the first preset ratio is greater than the second preset ratio, and the second preset ratio is greater than the third preset ratio. That is, in the case that the temperature overshoot occurs in the heat exchanger of the air conditioner external unit, the higher the third external disk temperature value is, the more the operation frequency of the control compressor is lowered. Alternatively, the value of the first preset proportion may be 90% -95%, in other words, the value of the first preset proportion may be 90%, 91%, 92%, 93%, 94% or 95%, etc.; taking the first preset ratio as 90% as an example, it can also be considered that the operation frequency of the compressor is reduced by 10% in step S310. In addition, the value of the second preset ratio may be 85% -90%, in other words, the value of the second preset ratio may be 85%, 86%, 87%, 88%, 89%, or 90%, etc.; similarly, taking the value of the second preset ratio as 85% as an example, it can be seen that the operation frequency of the compressor is reduced by 15% in step S320. The third preset ratio may take a value of 75% -85%, in other words, the third preset ratio may take a value of 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84% or 85%, etc.; when the third preset ratio takes a value of 80%, it can also be regarded that the operation frequency of the compressor is reduced by 20% in step S330.
In other embodiments of the present application, the second temperature threshold value and the first temperature threshold value are not different, and the value of the first preset ratio and the value of the second preset ratio may be the same. At this time, step S320 improves the heat radiation effect by increasing the rotation speed of the outdoor unit, so as to improve the temperature overshoot of the air conditioner outdoor unit, compared to step S310. In other words, in other embodiments of the present application, the first preset proportion, the second preset proportion and the third preset proportion may be selected to have the same value, and the heat dissipation effect may be improved by increasing the rotation speed of the external fan, so as to improve the temperature overshoot of the heat exchanger of the external air conditioner.
Alternatively, in some embodiments of the present application, the first temperature threshold may have a value in the range of 47-49 ℃, in other words, the first temperature threshold may have a value of 47.5 ℃, 48 ℃, 48.5 ℃, or the like. The value of the second temperature threshold may be in the range of 49-51 ℃, in other words, the value of the second temperature threshold may be 49.5 ℃, 50 ℃, 50.5 ℃ or the like. The third temperature threshold may be in a range of 51 ℃ to 53 ℃ or the like, in other words, the third temperature threshold may be 51.5 ℃, 52 ℃ or 52.5 ℃ or the like.
Alternatively, in some embodiments of the present application, the step of controlling the compressor to reduce the rate of the boost may include: the frequency raising rate of the compressor is halved, for example, if the frequency raising rate of the compressor is 20s/Hz before the condition that the temperature overshoot occurs in the heat exchanger of the air conditioner external unit is obtained, and the frequency raising rate of the compressor is 40s/Hz after the frequency raising rate of the compressor is controlled to be reduced. Of course, in other embodiments of the present application, the rate of increase of the compressor may be controlled according to other ratios, for example, the value of the ratio may be in the range of 30% -80%, in other words, in the step of controlling the rate of increase of the compressor, the value of the rate of increase of the compressor may be controlled to be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or 80%.
In addition, the control of the rotational speed of the external fan to increase by the preset rotational speed may also be regarded as increasing the operation gear of the external fan by a preset gear, for example, increasing by one gear or increasing by two gears. Similarly, controlling the rotation speed of the external fan to be increased to the highest rotation speed can also be regarded as increasing the operation gear of the external fan to the highest gear for operation.
After step S30, referring to fig. 1, in order to ensure that the air conditioner can operate normally, the overshoot protection method may further include:
step S41, maintaining the operation of the air conditioner for a second preset time;
and step S42, controlling the operation parameters of the external fan and the compressor to be adjusted to the operation parameters before the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value.
Wherein the maintenance in step S41 indicates that the air conditioner is controlled to operate for a second preset time with the operation parameters of the external fan and the compressor determined after step S30. After the operation time reaches the second preset time, the heat dissipation of the air conditioner can be regarded as being improved, so that the temperature overshoot condition of the heat exchanger of the air conditioner external unit can be improved, based on the heat dissipation condition, the step S42 can be executed to control the operation parameters of the external fan and the compressor to be adjusted back to the original operation parameters, and the air conditioner can be controlled to operate normally.
In the above steps, if the heat exchanger of the external air conditioner is in a temperature overshoot condition, the air conditioner is controlled to maintain the current operation state and continue to operate.
In order to perform the possible steps of the overshoot protection method provided in the above embodiments, please refer to fig. 6, in which fig. 6 shows a schematic functional block diagram of an overshoot protection device 10 according to an embodiment of the present application. The overshoot protection device 10 is applied to an air conditioner, and the overshoot protection device 10 provided by the embodiment of the application is used for executing the above overshoot protection method. It should be noted that, the basic principle and the technical effects of the overshoot protection device 10 provided in the present embodiment are substantially the same as those of the above embodiment, and for brevity, reference should be made to the corresponding contents of the above embodiment.
The overshoot protection device 10 includes an acquisition module 11, a judgment module 12, and a control module 13.
The obtaining module 11 is configured to obtain a first outer disc temperature value at a first time, a second outer disc temperature value and an outer ring temperature value at a second time, and a third outer disc temperature value at a third time when a running time of the air conditioner in a state of a cooling mode or a dehumidifying mode reaches a first preset time. The first time, the second time and the third time are time points sequentially passing in a first preset time, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are temperatures of a heat exchanger in the air conditioner outer unit, and the outer ring temperature value is a temperature of an external environment where the air conditioner outer unit is located.
Optionally, the obtaining module 11 is configured to perform step S10 in the foregoing respective figures, so as to achieve a corresponding technical effect.
The judging module 12 is configured to judge whether the heat exchanger of the air conditioner outdoor unit is in temperature overshoot according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value.
Optionally, the judging module 12 is configured to execute step S20 and the sub-steps thereof in the foregoing respective diagrams, so as to achieve the corresponding technical effects.
The control module 13 is configured to determine operation parameters of an external fan and a compressor of the air conditioner according to the third external disk temperature value when the judgment result obtained by the judgment module 12 is that the temperature of the heat exchanger of the external machine of the air conditioner is overshot.
Optionally, the control module 13 is configured to execute step S30 and the sub-steps thereof in the foregoing respective figures, so as to achieve a corresponding technical effect.
In summary, the overshoot protection method and device and the air conditioner provided in the embodiments of the present application can monitor a plurality of outer disc temperatures at different times and an outer disc temperature value at one time within a first preset time when the air conditioner is operated in a cooling mode or a dehumidifying mode to reach the first preset time, and can accurately determine whether the outer disc has temperature overshoot according to the outer disc temperature value and the plurality of outer disc temperatures. If the outer disc has temperature overshoot, the outer fan and the compressor are controlled to redetermine the operation parameters so as to improve the heat dissipation effect of the air conditioner outer machine, and improve the poor heat dissipation of the air conditioner outer machine caused by the temperature overshoot of the outer disc, so that the operation stability of the air conditioner is poor and the service life of the compressor is shortened. Based on the above, the overshoot protection method provided by the application can solve the problem of easy temperature overshoot of the outer disc caused by poor ventilation of the air conditioner outer unit.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present invention may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (7)
1. An overshoot protection method is applied to an air conditioner, and is characterized by comprising the following steps:
when the running time of the air conditioner in a refrigeration mode or a dehumidification mode reaches a first preset time, a first outer disc temperature value at a first moment, a second outer disc temperature value and an outer disc temperature value at a second moment and a third outer disc temperature value at a third moment are obtained; the first time, the second time and the third time are time points sequentially passing in the first preset time, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are temperatures of a heat exchanger in an air conditioner outer unit, and the outer ring temperature value is a temperature of an external environment where the air conditioner outer unit is located;
calculating a second outer disc temperature value to subtract the outer ring temperature value to obtain a first temperature difference value;
judging whether the first temperature difference value is larger than or equal to a first preset value;
if the first temperature difference value is smaller than the first preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot;
if the first temperature difference value is larger than or equal to the first preset value, calculating a second outer disc temperature value to subtract the first outer disc temperature value to obtain a second temperature difference value;
Judging whether the second temperature difference value is larger than or equal to a second preset value;
if the second temperature difference value is smaller than the second preset value, the heat exchanger of the air conditioner external unit does not have temperature overshoot;
if the second temperature difference value is larger than or equal to the second preset value, judging whether the third outer disc temperature value is smaller than a first temperature threshold value or not;
if the third outer disc temperature value is smaller than the first temperature threshold value, the heat exchanger of the air conditioner outer unit does not have temperature overshoot;
if the temperature value of the third outer disc is greater than or equal to the first temperature threshold value, the heat exchanger of the air conditioner outer unit is subjected to temperature overshoot;
and if the judging result is that the temperature of the heat exchanger of the air conditioner external unit overshoots, determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value.
2. The overshoot protection method according to claim 1, wherein the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value comprises:
if the third outer disc temperature value is greater than or equal to a first temperature threshold value and less than a second temperature threshold value, controlling the outer fan to maintain the current rotating speed, controlling the compressor to reduce the operating frequency to a first preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate;
If the third outer disc temperature value is greater than or equal to the second temperature threshold value and smaller than the third temperature threshold value, controlling the rotating speed of the outer fan to increase the preset rotating speed, controlling the compressor to reduce the operating frequency to a second preset proportion of the current operating frequency, and controlling the compressor to reduce the frequency raising rate;
and if the third outer disc temperature value is greater than or equal to the third temperature threshold value, controlling the rotating speed of the outer fan to be increased to the highest rotating speed, controlling the compressor to reduce the running frequency to a third preset proportion of the current running frequency, and controlling the compressor to reduce the frequency raising rate.
3. The overshoot protection method according to claim 2, wherein the first preset ratio is greater than the second preset ratio, and the second preset ratio is greater than the third preset ratio.
4. The overshoot protection method according to claim 2, wherein the step of controlling the compressor to reduce the frequency-increasing rate includes:
and controlling the frequency raising rate of the compressor to be halved.
5. The overshoot protection method according to claim 1, wherein after the step of determining the operation parameters of the outdoor unit and the compressor of the air conditioner according to the third outdoor unit temperature value if the heat exchanger temperature of the outdoor unit of the air conditioner overshoots as the judgment result, the overshoot protection method further comprises:
Maintaining the air conditioner to operate for a second preset time;
and controlling the operation parameters of the external fan and the compressor to be adjusted to the operation parameters before the step of determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value.
6. An overshoot protection device is applied to the air conditioner, characterized in that, the protection device that prevents overshooting includes:
the acquisition module is used for acquiring a first outer disc temperature value at a first moment, a second outer disc temperature value and an outer ring temperature value at a second moment and a third outer disc temperature value at a third moment when the running time of the air conditioner in a state of a refrigeration mode or a dehumidification mode reaches a first preset time; the first time, the second time and the third time are time points sequentially passing in the first preset time, the first outer disc temperature value, the second outer disc temperature value and the third outer disc temperature value are temperatures of a heat exchanger in an air conditioner outer unit, and the outer ring temperature value is a temperature of an external environment where the air conditioner outer unit is located;
the judging module is used for judging whether the temperature of the heat exchanger of the air conditioner outdoor unit overshoots or not according to the first outdoor unit temperature value, the second outdoor unit temperature value, the third outdoor unit temperature value and the outer ring temperature value;
The control module is used for calculating a second outer disc temperature value to subtract the outer ring temperature value to obtain a first temperature difference value; and the temperature sensor is also used for judging whether the first temperature difference value is larger than or equal to a first preset value;
when the first temperature difference value is smaller than the first preset value, a result that the heat exchanger of the air conditioner external unit does not have temperature overshoot is obtained;
when the first temperature difference value is larger than or equal to the first preset value, the first temperature difference value is used for calculating a second outer disc temperature value to subtract the first outer disc temperature value, so that a second temperature difference value is obtained;
and is further configured to determine whether the second temperature difference is greater than or equal to a second preset value;
when the second temperature difference value is smaller than the second preset value, a result that the heat exchanger of the air conditioner external unit does not have temperature overshoot is obtained;
when the second temperature difference value is greater than or equal to the second preset value, the second temperature difference value is used for judging whether the third outer disc temperature value is smaller than a first temperature threshold value or not;
when the temperature value of the third outer disc is smaller than the first temperature threshold value, a result that the heat exchanger of the air conditioner outer unit does not have temperature overshoot is obtained;
when the temperature value of the third outer disc is larger than or equal to the first temperature threshold value, a result of temperature overshoot of a heat exchanger of the air conditioner outer unit is obtained;
And the control module is used for determining the operation parameters of the external fan and the compressor of the air conditioner according to the third external disk temperature value when the judging result of the judging module is that the temperature of the heat exchanger of the air conditioner is overshot.
7. An air conditioner comprising a controller for performing the overshoot protection method according to any one of claims 1 to 5.
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