CN114264039A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN114264039A CN114264039A CN202111532345.8A CN202111532345A CN114264039A CN 114264039 A CN114264039 A CN 114264039A CN 202111532345 A CN202111532345 A CN 202111532345A CN 114264039 A CN114264039 A CN 114264039A
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- 238000010257 thawing Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000002441 reversible effect Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to a defrosting control method for an air conditioner, which combines the temperature and time conditions of an outdoor heat exchanger of an air conditioner system and the driving current of a direct current motor to carry out accurate defrosting control, and can further remove defrosting water, foreign matters and the like on the surface of the outdoor heat exchanger through the reverse rotation of the motor so as to achieve the optimal defrosting effect. The heat exchanger temperature sensor and the driver of the direct current motor continuously feed back data to the controller of the air conditioner, the direct current motor can carry out reversal, and the direct current motor can simultaneously feed back data such as driving current, rotating speed and the like to the controller of an air conditioner external unit by modifying the existing FG signal port. The control method additionally judges whether the heat exchanger is blocked or not, and judges through the temperature time condition of the heat exchanger and the driving current of the direct current motor, so that the error defrosting is reduced to the maximum extent, and the accurate defrosting is realized.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method for an air conditioner.
Background
The air conditioner is one of the essential devices in life, but in cold environment, the surface temperature of the heat exchanger of the outdoor unit is affected, once the surface temperature of the heat exchanger is lower than the dew point and freezing point temperature of the air, the surface of the heat exchanger will frost, the running capacity of the air conditioner will be greatly reduced after the frost is formed, and serious people even can cause vicious accidents such as compressor burnout.
The following conventional defrosting control methods are generally adopted, 1, an air pressure difference defrosting control method comprises the following steps: the pressure difference between two sides of the heat exchanger is increased due to the frosting of the heat exchanger, thereby controlling whether to defrost or not. 2. The temperature and time defrosting control method comprises the following steps: when the sensor detects that the surface temperature of the heat exchanger and the heating time of the heat pump reach set values, defrosting is started. 3. A timing defrosting control method: the defrosting interval time and the defrosting time are set according to experience to defrost. However, the above conventional defrosting control method is affected by the temperature and humidity difference of the environment in different areas, heat exchange blockage, limitation of the installation position of the temperature sensor, and the like, and the phenomena of 'defrosting without frost' and 'defrosting without frost' may occur. When frost is not removed, the frost layer blocks an airflow channel, the air flow is reduced, and the heat exchange thermal resistance is increased, so that the evaporation of a refrigerant in an evaporator is insufficient, the superheat degree of an outlet of the evaporator is reduced, the refrigerating capacity is reduced, and the like, and the condition that a unit is stopped or even a compressor is damaged can be caused. When the defrosting is carried out without frost, not only energy waste is caused, but also the high-pressure side pressure of the system is increased rapidly, the high-pressure protection threshold value of the system is greatly exceeded, the current of the compressor is increased rapidly in a short time, the power is increased suddenly, and if the defrosting is stopped untimely, the compressor can be damaged and the like. Therefore, the experience of customers is influenced by false defrosting, and even irreversible damage is caused to the reliability and stability of the air conditioner.
Disclosure of Invention
The invention aims to provide a defrosting control method of an air conditioner, which solves the problems of non-defrosting and non-defrosting false defrosting in the conventional defrosting method of the air conditioner.
The invention provides a defrosting control method of an air conditioner, which is used for judging whether the rising value of the current change of a direct current motor of an indoor unit exceeds a set value C, if so, further judging whether a judging curve of the temperature of an outdoor heat exchanger and the temperature of an outdoor environment enters a defrosting area and lasts for a first time, and if the judging curve enters the defrosting area and lasts for the first time, entering a defrosting mode by the air conditioner and starting defrosting; and judging whether the current change drop value of the direct current motor of the indoor unit exceeds a set value C, if so, further judging whether the defrosting mode lasts for a second time, meanwhile, judging whether the temperature of the outdoor heat exchanger is greater than the first temperature and lasts for a third time, and if the defrosting mode lasts for the second time and the temperature of the outdoor heat exchanger is greater than the first temperature and lasts for the third time, exiting the defrosting mode.
Preferably, the method further comprises the step of controlling the dc motor to rotate reversely for a fourth time after the defrosting mode is exited.
Preferably, the method further comprises the steps of controlling the air conditioner to reenter the heating operation mode after the reversal of the direct current motor is finished, calculating the maximum value of the current of the direct current motor after the direct current motor reaches the rated rotating speed, judging outdoor heat exchange blockage if the maximum value is larger than a set value Z, and reporting fault information.
Preferably, the first time is 30 s.
Preferably, the second time is 30 s.
Preferably, the first temperature is 12 ℃ and the third time is 10 s.
Preferably, the fourth time is 10 s.
Compared with the prior art, the invention has the beneficial effects that:
the temperature and time conditions of an outdoor heat exchanger of an air conditioner system and the driving current of a direct current motor are combined to carry out accurate defrosting control, so that 'frostless defrosting' and 'frostless defrosting' are effectively avoided, defrosting water, foreign matters and the like on the surface of the outdoor heat exchanger can be further removed through the reverse rotation of the direct current motor, and the optimal defrosting effect is achieved; the air conditioner runs for a long time and can possibly cause the surface of an outdoor heat exchanger to be blocked due to foreign matters such as dust, so that heat exchange is insufficient, the heating or refrigerating performance of the air conditioner can be gradually attenuated, judgment on whether heat exchange is blocked is added in the control method, the foreign matters such as dust on the surface of the heat exchange are eliminated through the reverse rotation of the direct current motor after defrosting is finished, the long-period running stability of the air conditioner can be ensured, and the customer experience is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioner according to a defrosting control method of the air conditioner of the present invention;
FIG. 2 is a flow chart of the defrosting control method of the air conditioner according to the present invention;
fig. 3 is an example of a determination curve of outdoor heat exchange temperature and outdoor ambient temperature.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
First, when the surface of the heat exchanger of the outdoor unit is frosted, the heat exchange condition of the heat exchanger is deteriorated, the return air resistance is increased, and the current of the direct current motor is also increased correspondingly. Therefore, the change in the dc motor current can be used as one of the conditions for determining whether or not the surface of the heat exchanger is frosted.
Next, the air conditioner hardware related to the defrosting control method of the air conditioner in this embodiment is as shown in fig. 1, and includes an air conditioner external unit controller, a dc motor controller, an air conditioner indoor unit, an outdoor heat exchanger, a compressor, and a throttle valve, where the air conditioner external unit controller is a main controller and is responsible for sending an outdoor unit operation instruction and receiving a feedback signal. The direct current motor adopted by the embodiment can be reversed, and the motor can simultaneously feed back data such as driving current, rotating speed and the like to the controller of the air conditioner external unit by modifying the existing FG signal port. The direct current motor controller is used as a driving controller of the direct current motor, can control the direct current motor to rotate forwards or reversely, and comprises a current calculating unit which can feed back the numerical value of the current of the direct current motor and other data (rotating speed, voltage and the like) to the outdoor unit controller. The outdoor heat exchanger is provided with a heat exchange air temperature sensor, the heat exchange air temperature sensor can feed back the collected temperature to the outdoor unit controller, and the temperature of the outdoor heat exchanger is one of the bases for judging whether the surface of the heat exchanger is frosted or not. The compressor, throttle valve, etc. are the necessary components for the operation of known air conditioners and are not described in detail.
Referring to fig. 2, the defrosting control method for the air conditioner according to the embodiment includes the following steps:
step (1): and (4) judging the operation mode of the air conditioner, defrosting under the heating mode, if the heating mode is met, performing the step (2), and otherwise, returning to the judgment again.
Step (2): and (5) judging the current rise value of the direct current motor. And (3) when the air conditioner is started, starting to record the current value of the direct current motor, judging whether the rising value of the current of the direct current motor is greater than C (C is a set value), wherein the rising value is the difference value between the maximum value and the minimum value of the current of the direct current motor, if the conditions are met, entering the step (3), and if the conditions are not met, continuously judging.
And (3): and (5) judging the temperature and time conditions. At this time, the defrosting condition is determined, the temperature collected by the outdoor heat exchanger temperature sensor and the outdoor environment temperature are obtained, whether an outdoor heat exchange temperature and outdoor environment temperature determination curve (fig. 3 shows an example of the outdoor heat exchange temperature and outdoor environment temperature determination curve) enters the defrosting area or not is determined, whether the temperature continues for 30s or not is determined, if yes, the step (4) is performed, and if not, the step (2) is performed again.
And (4): the defrost mode is entered because defrost techniques are already known and will not be described further herein.
And (5): and (4) judging the current drop value of the direct current motor. And (4) continuously calculating the current drop value of the direct current motor in the defrosting process, entering the step (6) when the current drop value of the direct current motor is larger than C (C is a set value), and otherwise, continuously judging.
And (6): and (5) judging the temperature and time conditions. And (4) judging the condition of exiting the defrosting, exiting the defrosting mode when the defrosting mode lasts for 30s and the temperature collected by the temperature sensor of the outdoor heat exchanger is more than 12 ℃ and lasts for 10s, entering the step (7), and otherwise, entering the step (5) for judging again.
And (7): the dc motor reverses. The fan is driven by the direct current motor to rotate reversely for 10s at the set rotating speed, the defrosting water and other foreign matters on the surface of the outdoor heat exchanger are further removed, and then the step (8) is carried out.
And (8): and re-entering the heating mode. And (4) stopping the operation of the compressor after defrosting is finished, stopping the operation of the motor after the step (7) is finished, and then, the air conditioner enters the heating mode again to wait for starting and then enters the step (9).
And (9): and D, judging the current value of the direct current motor. And (3) when the heating mode is operated again and the rotating speed of the direct current motor is stable, judging whether the maximum value of the current of the direct current motor is larger than Z (Z is a preset current value, and different rotating speed gears correspond to different Z values), if so, performing the step (10), and if not, performing the step (1).
Step (10): the line controller displays the fault code. Since the current determination in step 9 is that the defrosting mode is just finished, there is no frost layer on the surface of the outdoor heat exchanger when the fan returns, if the current value of the dc motor is too large, it indicates that there is a foreign object blocking condition on the surface of the outdoor heat exchanger, or the dc motor is running abnormally, etc. At this time, the line controller will display the corresponding fault code, and then re-enter step (1) to perform the next defrosting determination. The fault code does not affect the normal operation of the air conditioner, and when the defrosting is performed next time, the fault code is eliminated. The purpose is used for reminding the customer in time to contact after-sale and overhaul, and avoids the generation of later-stage bigger problems.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The defrosting control method of the air conditioner is characterized in that the method is used for judging whether the rising value of the current change of a direct current motor of an indoor unit exceeds a set value C, if so, further judging whether a judging curve of the temperature of an outdoor heat exchanger and the temperature of an outdoor environment enters a defrosting area and lasts for a first time, and if the judging curve enters the defrosting area and lasts for the first time, the air conditioner enters a defrosting mode to start defrosting; and judging whether the current change drop value of the direct current motor of the indoor unit exceeds a set value C, if so, further judging whether the defrosting mode lasts for a second time, meanwhile, judging whether the temperature of the outdoor heat exchanger is greater than the first temperature and lasts for a third time, and if the defrosting mode lasts for the second time and the temperature of the outdoor heat exchanger is greater than the first temperature and lasts for the third time, exiting the defrosting mode.
2. An air conditioner defrosting control method according to claim 1, further comprising the step of controlling the dc motor to reverse for a fourth time after the defrosting mode is exited.
3. An air conditioner defrosting control method according to claim 2, characterized in that: the method further comprises the steps of controlling the air conditioner to enter a heating operation mode again after the reverse rotation of the direct current motor is finished, calculating the maximum value of the current of the direct current motor after the direct current motor reaches the rated rotating speed, judging outdoor heat exchange blockage if the maximum value is larger than a set value Z, and reporting fault information.
4. An air conditioner defrosting control method according to claim 1, characterized in that: the first time is 30 s.
5. An air conditioner defrosting control method according to claim 1, characterized in that: the second time is 30 s.
6. An air conditioner defrosting control method according to claim 1, characterized in that: the first temperature is 12 ℃ and the third time is 10 s.
7. An air conditioner defrosting control method according to claim 2, characterized in that: the fourth time is 10 s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111532345.8A CN114264039A (en) | 2021-12-15 | 2021-12-15 | Defrosting control method for air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111532345.8A CN114264039A (en) | 2021-12-15 | 2021-12-15 | Defrosting control method for air conditioner |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451779A (en) * | 2007-11-28 | 2009-06-10 | 海尔集团公司 | Defrosting control method for heat pump air conditioner |
| CN101660808A (en) * | 2008-08-29 | 2010-03-03 | Tcl集团股份有限公司 | Air conditioner and frost removal control method thereof |
| US20170284717A1 (en) * | 2014-11-26 | 2017-10-05 | Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited | Air conditioner |
| CN110873428A (en) * | 2018-09-03 | 2020-03-10 | 青岛海尔空调器有限总公司 | Air conditioner cleaning control method and device |
| CN111426017A (en) * | 2020-05-12 | 2020-07-17 | 珠海格力电器股份有限公司 | Self-cleaning control method for outdoor heat exchanger of air conditioner, air conditioner and computer readable storage medium |
| CN113357791A (en) * | 2021-05-20 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and device for self-cleaning of air conditioner and air conditioner |
-
2021
- 2021-12-15 CN CN202111532345.8A patent/CN114264039A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451779A (en) * | 2007-11-28 | 2009-06-10 | 海尔集团公司 | Defrosting control method for heat pump air conditioner |
| CN101660808A (en) * | 2008-08-29 | 2010-03-03 | Tcl集团股份有限公司 | Air conditioner and frost removal control method thereof |
| US20170284717A1 (en) * | 2014-11-26 | 2017-10-05 | Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited | Air conditioner |
| CN110873428A (en) * | 2018-09-03 | 2020-03-10 | 青岛海尔空调器有限总公司 | Air conditioner cleaning control method and device |
| CN111426017A (en) * | 2020-05-12 | 2020-07-17 | 珠海格力电器股份有限公司 | Self-cleaning control method for outdoor heat exchanger of air conditioner, air conditioner and computer readable storage medium |
| CN113357791A (en) * | 2021-05-20 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and device for self-cleaning of air conditioner and air conditioner |
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Application publication date: 20220401 |