CN107255340B - Control method and control system for preventing compressor of inverter air conditioner from overheating - Google Patents
Control method and control system for preventing compressor of inverter air conditioner from overheating Download PDFInfo
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- CN107255340B CN107255340B CN201710448991.3A CN201710448991A CN107255340B CN 107255340 B CN107255340 B CN 107255340B CN 201710448991 A CN201710448991 A CN 201710448991A CN 107255340 B CN107255340 B CN 107255340B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000013021 overheating Methods 0.000 title claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 71
- 238000010438 heat treatment Methods 0.000 claims description 28
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 18
- 238000001816 cooling Methods 0.000 description 15
- 238000005070 sampling Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- ALSTYHKOOCGGFT-KTKRTIGZSA-N (9Z)-octadecen-1-ol Chemical compound CCCCCCCC\C=C/CCCCCCCCO ALSTYHKOOCGGFT-KTKRTIGZSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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Abstract
The invention relates to a control method and a control system for preventing a compressor of an inverter air conditioner from overheating. The control method comprises the following steps: acquiring the temperature of the compressor body and the exhaust temperature of the compressor; and controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to the temperature interval of the exhaust temperature of the compressor and the temperature interval of the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor. The control system comprises a temperature acquisition module for acquiring temperature, a comparison module for determining a temperature interval and a temperature difference interval and a control module for controlling the compressor to execute corresponding operations. The invention can more accurately judge the actual running state of the compressor, accurately control the compressor to execute corresponding frequency conversion or stop operation, and avoid a series of defects possibly brought by singly adopting the single parameter of the exhaust temperature to control the compressor, thereby more effectively preventing the compressor of the frequency conversion air conditioner from overheating.
Description
Technical Field
The present invention relates to air conditioning technology, and more particularly, to a control method and a control system for preventing overheating of a compressor of an inverter air conditioner.
Background
The compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. The quality of the compressor directly affects the quality of the air conditioner. Compressor damage can only be replaced, and the cost of replacing one compressor is high. From the research data of the household air conditioner, the original compressor accounts for about 20% of the cost of the air conditioner external unit, and a user can not only difficultly match the original compressor with the original compressor, but also has high replacement cost. Therefore, protection of the air conditioner compressor is very important.
One of the main reasons for damage to the compressor is overheating of the compressor, and generally, overheating damage of the compressor is mainly caused by oil shortage of a ① press, abnormal operation and original protection failure of an air conditioner caused by sensor faults such as ② ring temperature, exhaust gas return and the like, blockage of an exhaust port and a throttling device of a ③ press, idle operation of a ④ absent refrigerant press and the like.
In the prior art, the operation condition of the compressor is generally judged according to the exhaust temperature of the compressor, and the operation frequency of the compressor is adjusted, so that the temperature of the compressor body is reduced. The method has the disadvantages that when the system is seriously short of air, no refrigerant circulates, the exhaust temperature is not high, and the purpose of protection cannot be achieved. At the moment, the compressor runs in a non-running mode, the compressor body is lack of oil, and the temperature of the compressor body is continuously increased by heat generated by friction. In addition, the overheating of the compressor can also be prevented by improving the quality of the coil, improving the quality of the coil insulating grease or improving the quality of the oil, but all of them require development of new materials, are high in cost, have a long period, and as a result, are difficult to expect.
Disclosure of Invention
An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a control method capable of effectively preventing overheating of a compressor of an inverter air conditioner.
Another object of the first aspect of the present invention is to ensure stable operation of the compressor under the rated maximum cooling capacity and the rated maximum heating capacity.
It is a further object of the first aspect of the invention to improve the accuracy of exhaust gas temperature detection and avoid errors.
An object of a second aspect of the present invention is to provide a control system for preventing overheating of a compressor of an inverter air conditioner.
According to a first aspect of the present invention, the present invention provides a control method for preventing overheating of a compressor of an inverter air conditioner, comprising:
acquiring the temperature of the compressor body and the exhaust temperature of the compressor; and
and controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to the temperature interval of the discharge temperature of the compressor and the temperature interval of the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor.
Optionally, when the inverter air conditioner is in a rated maximum cooling capacity and a rated maximum heating capacity operating condition that a compressor of the inverter air conditioner operates at the highest frequency, a minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor is set to be greater than a minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor in any other operating condition.
Optionally, the step of controlling the compressor to perform a corresponding variable frequency operation or an abnormal stop operation according to a temperature interval in which the discharge temperature of the compressor is located and a temperature interval in which a temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is located specifically includes:
when the discharge temperature of the compressor is at (0, T)1]Or a temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is (0, t)1]In the temperature difference interval, the compressor is controlled to have a first speed V1Fast frequency rising;
when the discharge temperature of the compressor is at (T)1，T2]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)1，t2]During the temperature difference interval, controlling the compressor to have a second speed V2Slowly increasing the frequency;
when the discharge temperature of the compressor is at (T)2，T3]Or between the temperature of the compressor body and the discharge temperature of the compressorIs at a temperature difference value of (t)2，t3]When the temperature difference is within the range, controlling the frequency of the compressor to keep unchanged;
when the discharge temperature of the compressor is at (T)3，T4]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)3，t4]During the temperature difference interval, controlling the compressor to have a second speed V3Slow down frequency;
when the discharge temperature of the compressor is at (T)4，T5]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)4，t5]During the temperature difference interval, controlling the compressor to have a second speed V4Fast frequency reduction; and
when the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, controlling the compressor to execute abnormal stop operation;
wherein, T5>T4>T3>T2>T1，t5>t4>t3>t2>t1，V1>V2，V4>V3。
Optionally, T is when the inverter air conditioner is in a rated maximum cooling capacity and a rated maximum heating capacity operating at the highest frequency of a compressor of the inverter air conditioner1、T2、T3、T4、T5Are respectively greater than T under any other working condition1、T2、T3、T4、T5The value of (c).
Optionally, after the compressor performs an abnormal stop operation, the control method further includes:
when the abnormal stop time of the compressor exceeds a first preset time or the exhaust temperature of the compressor is less than T1Or the temperature of the compressor body and the compressorIs less than t1And controlling the compressor to restart the operation.
Optionally, when the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, the step of controlling the compressor to execute the abnormal stop operation specifically includes:
when the discharge temperature of the compressor exceeds T5And after the operation lasts for a second preset time, detecting the exhaust temperature of the compressor for multiple times according to a preset time period, and if the exhaust temperature of the compressor measured each time exceeds T5Controlling the compressor to perform an abnormal stop operation; or
When the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor exceeds t5After the second preset time duration is continued, detecting the temperature of the compressor body and the exhaust temperature of the compressor for multiple times according to a preset time period, calculating the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor, and if the temperature difference value calculated each time exceeds t5Controlling the compressor to perform an abnormal stop operation.
Optionally, before the step of obtaining the temperature of the compressor body and the discharge temperature of the compressor, the control method further includes:
judging whether the operation of a temperature acquisition module for acquiring the temperature of the compressor body and the exhaust temperature of the compressor is abnormal or not, and if so, giving an indication that the temperature acquisition module has a fault; if not, controlling the temperature acquisition module to start acquiring the temperature of the compressor body and the exhaust temperature of the compressor.
According to a second aspect of the present invention, the present invention also provides a control system for preventing overheating of a compressor of an inverter air conditioner, comprising:
the temperature acquisition module is used for acquiring the temperature of the compressor body and the exhaust temperature of the compressor;
the comparison module is used for comparing the exhaust temperature of the compressor with a preset temperature interval in the comparison module and comparing a temperature difference value between the temperature of the compressor body and the exhaust temperature with a preset temperature difference interval in the comparison module so as to determine the temperature interval of the exhaust temperature of the compressor and determine the temperature difference interval of the temperature difference value between the temperature of the compressor body and the exhaust temperature; and
and the control module is used for controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to the temperature interval where the exhaust temperature of the compressor is located and the temperature interval where the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is located.
Optionally, a minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under a rated maximum cooling capacity working condition and a rated maximum heating capacity working condition of the compressor running at the highest frequency, which are preset in the comparison module, is greater than a minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other working condition.
Optionally, the control module is configured to control the compressor to discharge air at a temperature of (0, T)1]Or a temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is (0, t)1]In the temperature difference interval of (1) controlling the compressor to a first speed V1Fast ramp-up at discharge temperature of said compressor at (T)1，T2]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)1，t2]During the temperature difference interval, the compressor is controlled to have a second speed V2Slow ramp-up at discharge temperature of said compressor at (T)2，T3]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)2，t3]Is controlled to remain constant during the temperature difference interval of (1), the discharge temperature of the compressor is at (T)3，T4]Temperature zone of or the compressor blockThe temperature difference between the temperature of the body and the discharge temperature of the compressor being at (t)3，t4]During the temperature difference interval, the compressor is controlled to have a second speed V3Slow down, at discharge temperature of the compressor at (T)4，T5]Or a temperature difference value between a temperature of the compressor body and a discharge temperature of the compressor is at (t)4，t5]During the temperature difference interval, the compressor is controlled to have a second speed V4Fast ramp down, at discharge temperature of the compressor at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, controlling the compressor to execute abnormal stop operation;
wherein, T5>T4>T3>T2>T1，t5>t4>t3>t2>t1，V1>V2，V4>V3。
The control method of the invention controls the compressor to execute corresponding frequency conversion operation or abnormal stop operation according to the two parameters of the temperature interval of the exhaust temperature of the compressor and the temperature difference interval of the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor, can more accurately judge the actual running state of the compressor, accurately control the compressor to execute corresponding frequency conversion or stop operation, and avoid a plurality of disadvantages possibly brought by singly adopting the exhaust temperature to control the compressor, thereby more effectively preventing the compressor of the frequency conversion air conditioner from overheating.
Furthermore, the invention separately takes out the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under the working condition of the rated maximum refrigerating capacity and the working condition of the rated maximum heating capacity, so that the minimum endpoint value is independent of other working conditions and is specially designed to be larger than the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other working condition, namely, the invention improves the threshold value of the exhaust temperature for promoting the abnormal stop of the compressor under the working condition of the rated maximum refrigerating capacity and the working condition of the rated maximum heating capacity, thereby widening the protection range of the exhaust temperature, ensuring that the operating frequency of the compressor does not fluctuate under the working conditions of the rated maximum refrigerating capacity and the rated maximum heating capacity, ensuring that the exhaust temperature of the compressor, the refrigerating capacity of the air conditioner, the overall power and the like do not fluctuate, and ensuring the stable operation of the air conditioner.
Furthermore, the invention detects the exhaust temperature of the compressor for a plurality of times according to the preset time period or detects the temperature of the compressor body and the exhaust temperature of the compressor for a plurality of times, and calculates the temperature difference value between the exhaust temperature and the compressor, and controls the compressor to execute abnormal stop operation only when the exhaust temperature measured each time exceeds the set temperature value or the temperature difference value calculated each time exceeds the set temperature difference value, thereby ensuring the accuracy of the exhaust temperature detection and avoiding the stop of the compressor when the compressor is not stopped due to detection errors or other abnormal factors.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow chart of a control method for preventing overheating of a compressor of an inverter air conditioner according to one embodiment of the present invention;
FIG. 2 is a schematic flowchart of a control method for preventing overheating of a compressor of an inverter air conditioner according to another embodiment of the present invention;
fig. 3 is a schematic configuration block diagram of a control system for preventing overheating of a compressor of an inverter air conditioner according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention firstly provides a control method for preventing a compressor of an inverter air conditioner from overheating. Fig. 1 is a schematic flowchart of a control method for preventing overheating of a compressor of an inverter air conditioner according to one embodiment of the present invention. The control comprises the following steps:
step S102, acquiring the temperature of a compressor body and the exhaust temperature of the compressor; and
and step S104, controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to the temperature interval of the exhaust temperature of the compressor and the temperature interval of the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor. Wherein the temperature of the compressor body is preferably the temperature in the middle of the compressor so that it is closer to the actual temperature of the compressor body.
That is to say, the control method of the present invention controls the compressor to execute the corresponding frequency conversion operation or the abnormal stop operation according to the two parameters, namely, the temperature interval in which the discharge temperature of the compressor is located, and the temperature difference interval in which the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is located, so that the actual operation state of the compressor can be more accurately judged, the compressor is more accurately controlled to execute the corresponding frequency conversion or stop operation, some series of disadvantages possibly brought by controlling the compressor by singly adopting the discharge temperature can be avoided, and the compressor of the inverter air conditioner can be more effectively prevented from overheating.
In some embodiments of the present invention, when the inverter air conditioner is in a rated maximum cooling capacity and a rated maximum heating capacity operating condition in which a compressor thereof operates at a highest frequency, a minimum endpoint value of a temperature interval corresponding to an abnormal stop of the compressor is set to be greater than a minimum endpoint value of a temperature interval corresponding to an abnormal stop of the compressor in any other operating condition. Specifically, in the actual operation process of the inverter air conditioner, various different working conditions are usually included, for example, besides the rated maximum cooling capacity and the rated maximum heating capacity, other common working conditions include the rated cooling capacity, the rated intermediate cooling capacity, the rated heating capacity, the rated intermediate heating capacity, the fixed-frequency low-temperature heating capacity, the cooling outer-loop temperature limit frequency, the heating outer-loop temperature limit frequency, the maximum operation cooling, the maximum operation heating, and the like.
The invention separately takes out the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under the working condition of the rated maximum refrigerating capacity and the working condition of the rated maximum heating capacity, so that the minimum endpoint value is independent of other working conditions and is specially designed to be larger than the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other working condition, namely, the invention improves the threshold value of the exhaust temperature for promoting the abnormal stop of the compressor under the working condition of the rated maximum refrigerating capacity and the working condition of the rated maximum heating capacity, thereby widening the protection range of the exhaust temperature, ensuring that the operating frequency of the compressor does not fluctuate under the working conditions of the rated maximum refrigerating capacity and the rated maximum heating capacity, ensuring that the exhaust temperature of the compressor, the refrigerating capacity of the air conditioner, the overall power and the like do not fluctuate, and ensuring the stable operation of the air conditioner.
In some embodiments of the present invention, the step of controlling the compressor to perform the corresponding variable frequency operation or the abnormal stop operation according to the temperature interval in which the discharge temperature of the compressor is located and the temperature interval in which the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is located specifically includes:
when the discharge temperature of the compressor is at (0, T)1]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (0, t)1]During the temperature difference interval, the compressor is controlled to have a first speed V1Fast frequency rising; when the discharge temperature of the compressor is at (T)1，T2]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)1，t2]During the temperature difference interval, the compressor is controlled to have a second speed V2Slowly increasing the frequency; when the discharge temperature of the compressor is at (T)2，T3]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)2，t3]When the temperature difference is within the range, the frequency of the compressor is controlled to be kept unchanged; when the discharge temperature of the compressor is at (T)3，T4]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)3，t4]During the temperature difference interval, the pressure is controlledThe compressor is at the second speed V3Slow down frequency; when the discharge temperature of the compressor is at (T)4，T5]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)4，t5]During the temperature difference interval, the compressor is controlled to have a second speed V4Fast frequency reduction; and when the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor5And ∞) temperature difference interval, controlling the compressor to execute abnormal stop operation; wherein, T5>T4>T3>T2>T1，t5>t4>t3>t2>t1，V1>V2，V4>V3. The temperature range and the temperature difference range corresponding to the abnormal stop of the compressor are (T)5Infinity) and the minimum endpoint value of the temperature interval is T5. That is, when the discharge temperature of the compressor exceeds T5When the compressor is stopped, the compressor can be prompted to stop running abnormally.
That is, each of the frequency conversion operation (for example, the fast up-conversion, the slow up-conversion, the fast down-conversion or the slow down-conversion) or the abnormal stop operation of the compressor corresponds to two determination conditions, one is the discharge temperature of the compressor, and the other is the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor, and when any one of the conditions is satisfied first, the corresponding frequency conversion operation or the abnormal stop operation is performed.
Further, T1、T2、T3、T4、T5、t1、t2、t3、t4、t5、V1、V2、V3And V4Are all preset values in the system. Wherein, V1May be equal to V3，V2May be equal to V4. Specifically, in one embodiment, V1And V3May all be 0.1 hertz per second, V2And V4May all be 1 hertz per second.
In some embodiments of the present invention, T is the rated maximum cooling capacity and the rated maximum heating capacity of the inverter air conditioner under the condition that the compressor of the inverter air conditioner runs at the highest frequency1、T2、T3、T4、T5Are respectively greater than T under any other working condition1、T2、T3、T4、T5The value of (c). That is to say, under rated maximum refrigerating capacity working condition and rated maximum heating capacity working condition, the endpoint value of each temperature interval is improved compared with other working conditions, thereby ensuring the stability of the compressor in the process of frequency increasing and frequency reducing, and further ensuring the stable operation of the compressor in the whole process.
Specifically, in one embodiment of the present invention, under rated maximum cooling capacity conditions and rated maximum heating capacity conditions, T1、T2、T3、T4、T5The values of (A) were 98 ℃, 105 ℃, 108 ℃, 112 ℃ and 117 ℃, respectively. Under other conditions, T1、T2、T3、T4、T5The values are 88 deg.C, 91 deg.C, 95 deg.C, 100 deg.C, and 105 deg.C, respectively. That is, in other conditions, the compressor is controlled to stop abnormally when the discharge temperature of the compressor rises to more than 105 ℃. Under the working condition of rated maximum refrigerating capacity and the working condition of rated maximum heating capacity, the compressor is controlled to be abnormally stopped after the exhaust temperature of the compressor is increased to exceed 117 ℃. Thus, the compressor may be allowed to remain in steady operation at the highest frequency for a certain period of time without shutdown.
Further, in one embodiment of the present invention, t is the operating condition of the engine1、t2、t3、t4、t5The values are 30 ℃, 40 ℃, 50 ℃, 60 ℃ and 70 ℃ respectively.
In some embodiments of the present invention, after the compressor performs the abnormal stop operation, the control method of the present invention further includes: when the abnormal stop time of the compressor exceeds a first preset time or the exhaust temperature of the compressor is less than T1Or the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is less than t1And when the compressor is started, controlling the compressor to restart to operate. That is, when the period of abnormal stop of the compressor exceeds a first preset period, the discharge temperature of the compressor is less than T1And the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is less than t1When any of these three conditions is met, the compressor can resume operation without damage. The first preset time period is a preset time period in the system, and may be, for example, 3 minutes.
In some embodiments of the invention, when the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor5And ∞) temperature difference interval, the step of controlling the compressor to execute the abnormal stop operation specifically includes:
when the discharge temperature of the compressor exceeds T5And after the second preset duration, detecting the exhaust temperature of the compressor for multiple times according to a preset time period, and if the exhaust temperature of the compressor measured each time exceeds T5Controlling the compressor to execute abnormal stop operation; or
When the temperature difference between the temperature of the compressor body and the exhaust temperature of the compressor exceeds t5After the temperature of the compressor body and the exhaust temperature of the compressor are continuously detected for a second preset time period for a plurality of times according to a preset time period, the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is calculated, and if the temperature difference value calculated each time exceeds t5The compressor is controlled to perform an abnormal stop operation.
That is, when a certain condition is reached, the invention detects the exhaust temperature of the compressor for a plurality of times according to a preset time period or detects the temperature of the compressor body and the exhaust temperature of the compressor for a plurality of times, and calculates the temperature difference value between the exhaust temperature and the temperature of the compressor body, and controls the compressor to execute abnormal stop operation only when the exhaust temperature measured each time exceeds a set temperature value or the calculated temperature difference value exceeds a set temperature difference value, thereby ensuring the accuracy of the exhaust temperature detection and avoiding the stop of the compressor when the compressor is not stopped due to detection errors or other abnormal factors.
Further, the second preset time and the preset time period are both preset time lengths in the system, the value of the second preset time may be, for example, 20 seconds, and the preset time period may be, for example, 10 minutes. Specifically, the control method of the present invention can detect the temperature of the compressor body and the discharge temperature of the compressor once every 10 minutes for a total of 3 times, if each detected discharge temperature exceeds T5Or the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor calculated each time exceeds t5The compressor is controlled to perform an abnormal stop operation. When the compressor is stopped abnormally, the compressor can send out sound, optical characters or other suitable prompts or warnings to transmit the fault to the indoor or other suitable places.
In some embodiments of the present invention, the step of obtaining the temperature of the compressor body and the discharge temperature of the compressor specifically comprises: the temperature of the compressor body and the discharge temperature of the compressor are detected n times according to a preset time period, and the average value of the detection results of the n times is taken as the acquired temperature of the compressor body and the discharge temperature of the compressor.
Further, each operation of detecting the temperature of the compressor body and the discharge temperature of the compressor includes: sampling the temperature of the compressor body and the exhaust temperature of the compressor for m times continuously, sequencing the sampling results according to the size, and taking the average value of the two sequenced sampling results as the temperature and the exhaust temperature of the compressor body measured by the detection, wherein n is an integer greater than or equal to 10, and m is an even number greater than or equal to 2.
That is to say, the temperature of the compressor body and the exhaust temperature of the compressor are obtained by a method of detecting and averaging for multiple times, each detection is performed by sampling for multiple times, and the average value of the middle two values after being sorted according to the size is taken as the detection result, so that the accuracy of temperature detection is improved.
Specifically, the preset time period, and m and n are all preset parameters in the system. In one embodiment, m and n may be 8 and 100, respectively, and the predetermined time period may be, for example, 5 milliseconds. That is, the temperature acquisition module may detect the temperature of the compressor body and the discharge temperature of the compressor once every 5 milliseconds, the total detection is 100 times, and the average value of the 100 detection results is taken as the acquired temperature of the compressor body and the discharge temperature of the compressor. In the process of each detection, the temperature acquisition module adopts a detection mode of continuously sampling the temperature and the exhaust temperature of the compressor body for 8 times, then sorting the 8-time sampling results according to the size, and finally taking the average value of the two sorted middle values as the temperature and the exhaust temperature of the compressor body measured at this time.
Fig. 2 is a schematic flowchart of a control method for preventing overheating of a compressor of an inverter air conditioner according to another embodiment of the present invention. In other embodiments of the present invention, before the step of obtaining the temperature of the compressor body and the discharge temperature of the compressor, the control method of the present invention further comprises: judging whether the operation of a temperature acquisition module for acquiring the temperature of the compressor body and the exhaust temperature of the compressor is abnormal or not, and if so, giving an indication that the temperature acquisition module has a fault; if not, the temperature acquisition module is controlled to start to acquire the temperature of the compressor body and the exhaust temperature of the compressor. That is, in other embodiments of the present invention, the control method of the present invention further includes: step S101, judging whether the operation of a temperature acquisition module for acquiring the temperature of the compressor body and the exhaust temperature of the compressor is abnormal or not. If yes, go to step S103: giving an indication that the temperature acquisition module has a fault; if not, go to step S102: the temperature of the compressor body and the discharge temperature of the compressor are obtained.
Further, the temperature acquisition module may be a temperature sensor, and may determine whether the temperature sensor fails by detecting whether a resistance value thereof exceeds a preset threshold. Generally, if there is a fault in the temperature acquisition module, it must be alarmed ten minutes after the compressor is turned on.
The embodiment of the invention also provides a control system for preventing the compressor of the inverter air conditioner from overheating. Fig. 3 is a schematic configuration block diagram of a control system for preventing overheating of a compressor of an inverter air conditioner according to an embodiment of the present invention. The control system includes a temperature acquisition module 20, a comparison module 30, and a control module 40. The temperature obtaining module 20 is used for obtaining the temperature of the compressor body and the exhaust temperature of the compressor. The comparing module 30 is configured to compare the discharge temperature of the compressor with a preset temperature interval in the comparing module, and compare a temperature difference value between the temperature of the compressor body and the discharge temperature with a preset temperature difference interval in the comparing module, so as to determine a temperature interval where the discharge temperature of the compressor is located, and determine a temperature difference interval where the temperature difference value between the temperature of the compressor body and the discharge temperature is located. The control module 40 is used for controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to a temperature interval in which the discharge temperature of the compressor is located and a temperature interval in which a temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is located.
In some embodiments of the present invention, the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under the rated maximum cooling capacity condition and the rated maximum heating capacity condition, where the compressor operates at the highest frequency, preset in the comparison module 30 is greater than the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other condition. That is, the temperature threshold for prompting the compressor to abnormally stop under the working condition of the rated maximum cooling capacity and the working condition of the rated maximum heating capacity preset in the comparison module 30 is greater than the temperature threshold for prompting the compressor to abnormally stop under any other working condition. Therefore, the protection range of the exhaust temperature is widened, and the operating frequency of the compressor under the two working conditions is ensured to be not fluctuated, so that the exhaust temperature of the compressor, the refrigerating capacity and the overall power of the air conditioner are ensured to be not fluctuated, and the stable operation of the air conditioner is ensured.
In some embodiments of the present invention, the control module 40 is configured to control the compressor to discharge air at a temperature of (0, T)1]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (0, t)1]In the temperature difference interval of (3), the compressor is controlled to have a first speed V1Fast ramp-up, at compressor discharge temperature of (T)1，T2]Temperature zone of or temperature of the compressor bodyThe value of the temperature difference between the temperature and the discharge temperature of the compressor is (t)1，t2]During the temperature difference interval, the compressor is controlled to have a second speed V2Slow ramp-up, at compressor discharge temperature of (T)2，T3]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)2，t3]The frequency of the compressor is controlled to be constant in the temperature difference interval, and the exhaust temperature of the compressor is (T)3，T4]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)3，t4]During the temperature difference interval, the compressor is controlled to have a second speed V3Slow down, at compressor discharge temperature of (T)4，T5]Or the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is at (t)4，t5]During the temperature difference interval, the compressor is controlled to have a second speed V4Fast ramp down, at compressor discharge temperature of (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor5And ∞) temperature difference interval, controlling the compressor to execute abnormal stop operation; wherein, T5>T4>T3>T2>T1，t5>t4>t3>t2>t1，V1>V2，V4>V3. The temperature range corresponding to the abnormal stop of the compressor is (T)5Infinity) and the minimum endpoint value of the temperature interval is T5. That is, when the discharge temperature of the compressor exceeds T5When the compressor is stopped, the compressor can be prompted to stop running abnormally.
In some embodiments of the present invention, T preset in the comparison module 30 under the rated maximum cooling capacity condition and the rated maximum heating capacity condition is compared1、T2、T3、T4、T5Is respectively greater than T preset therein under any other working condition1、T2、T3、T4、T5The value of (c). That is to say that the position of the first electrode,under the working conditions of rated maximum refrigerating capacity and rated maximum heating capacity, the endpoint value of each temperature interval is improved compared with other working conditions, so that the stability of the compressor in the frequency increasing and reducing processes is ensured, and the stable operation of the compressor is further ensured.
In some embodiments of the present invention, the control module 40 is further configured to determine when the compressor is abnormally stopped for a period of time exceeding a first preset period of time or when the discharge temperature of the compressor is less than T1Or the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is less than t1And when the compressor is started, controlling the compressor to restart to operate.
In some embodiments of the invention, the control module 40 is further configured to control the compressor when the discharge temperature of the compressor exceeds T5And after the second preset time duration, controlling the temperature obtaining module 20 to detect the discharge temperature of the compressor for a plurality of times according to a preset time period, and when the discharge temperature of the compressor measured each time exceeds T5The abnormal stop of the compressor is controlled to avoid the stop of the compressor when the compressor is not stopped due to detection errors or other abnormal factors. Alternatively, the control module 40 is further configured to control the compressor when the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor exceeds t5And after the second preset time duration, controlling the temperature acquisition module 20 to detect the temperature of the compressor body and the exhaust temperature of the compressor for multiple times according to a preset time period, and calculating the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor, wherein if the temperature difference value calculated each time exceeds t5The compressor is controlled to perform an abnormal stop operation to prevent the compressor from stopping when it should not stop due to a detection error or other abnormal factors.
In some embodiments of the present invention, the control module 40 is further configured to control the temperature obtaining module 20 to detect the temperature of the compressor body and the discharge temperature of the compressor n times according to a preset time period when obtaining the temperature of the compressor body and the discharge temperature of the compressor, and to take an average of the n times of detection results as the obtained temperature of the compressor body and the discharge temperature of the compressor.
In some embodiments of the present invention, the control module 40 is further configured to control the temperature obtaining module 20 to perform continuous m times of sampling on the temperature of the compressor body and the exhaust temperature of the compressor each time the temperature of the compressor body and the exhaust temperature of the compressor are detected, sort the sampling results according to the magnitude, and take the average value of the middle two sorted sampling results as the temperature of the compressor body and the exhaust temperature detected by the current detection.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A control method for preventing overheating of a compressor of an inverter air conditioner includes:
acquiring the temperature of the compressor body and the exhaust temperature of the compressor; and
controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to a temperature interval in which the exhaust temperature of the compressor is located and a temperature difference interval in which a temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is located; wherein
The step of controlling the compressor to execute the corresponding variable frequency operation or abnormal stop operation according to the temperature interval of the discharge temperature of the compressor and the temperature interval of the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor specifically comprises the following steps:
when the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is (0, t)1]In the temperature difference interval, the compressor is controlled to have a first speed V1Fast frequency rising;
when the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is in (t)1，t2]During the temperature difference interval, the compression is controlledAt a second speed V2Slowly increasing the frequency;
when the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is in (t)2，t3]When the temperature difference is within the range, controlling the frequency of the compressor to keep unchanged;
when the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is in (t)3，t4]During the temperature difference interval, controlling the compressor to have a second speed V3Slow down frequency;
when the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is in (t)4，t5]During the temperature difference interval, controlling the compressor to have a second speed V4Fast frequency reduction; wherein,
t5>t4>t3>t2>t1，V1>V2，V4>V3。
2. the control method according to claim 1, wherein
When the inverter air conditioner is in a rated maximum refrigerating capacity and a rated maximum heating capacity working condition that a compressor of the inverter air conditioner runs at the highest frequency, a minimum endpoint value of a temperature interval corresponding to the abnormal stop of the compressor is set to be larger than a minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other working condition.
3. The control method according to claim 1, wherein
The step of controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to the temperature interval of the discharge temperature of the compressor and the temperature interval of the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor specifically comprises the following steps:
when the discharge temperature of the compressor is at (0, T)1]In the temperature range of (1), controlling the compressor to the first speed V1Fast frequency rising;
when the discharge temperature of the compressor is at (T)1，T2]During the temperature interval, controlling the compressor to have the second speed V2Slowly increasing the frequency;
when the discharge temperature of the compressor is at (T)2，T3]Controlling the frequency of the compressor to keep unchanged during the temperature interval;
when the discharge temperature of the compressor is at (T)3，T4]During the temperature interval, controlling the compressor to have the second speed V3Slow down frequency;
when the discharge temperature of the compressor is at (T)4，T5]During the temperature interval, controlling the compressor to have the second speed V4Fast frequency reduction; and
when the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, controlling the compressor to execute abnormal stop operation;
wherein, T5>T4>T3>T2>T1。
4. The control method according to claim 3, wherein
Under the working conditions that the compressor of the inverter air conditioner runs at the highest frequency, namely the rated maximum refrigerating capacity and the rated maximum heating capacity, T1、T2、T3、T4、T5Are respectively greater than T under any other working condition1、T2、T3、T4、T5The value of (c).
5. The control method according to claim 3, wherein
After the compressor performs the abnormal stop operation, the control method further includes:
when the abnormal stop time of the compressor exceeds a first preset time or the exhaust temperature of the compressor is less than T1Or the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is less than t1And controlling the compressor to restart the operation.
6. The control method according to claim 3, wherein
When the discharge temperature of the compressor is at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, the step of controlling the compressor to execute the abnormal stop operation specifically includes:
when the discharge temperature of the compressor exceeds T5And after the operation lasts for a second preset time, detecting the exhaust temperature of the compressor for multiple times according to a preset time period, and if the exhaust temperature of the compressor measured each time exceeds T5Controlling the compressor to perform an abnormal stop operation; or
When the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor exceeds t5After the second preset time duration is continued, detecting the temperature of the compressor body and the exhaust temperature of the compressor for multiple times according to a preset time period, calculating the temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor, and if the temperature difference value calculated each time exceeds t5Controlling the compressor to perform an abnormal stop operation.
7. The control method according to claim 1, wherein
Before the step of obtaining the temperature of the compressor body and the discharge temperature of the compressor, the control method further includes:
judging whether the operation of a temperature acquisition module for acquiring the temperature of the compressor body and the exhaust temperature of the compressor is abnormal or not, and if so, giving an indication that the temperature acquisition module has a fault; if not, controlling the temperature acquisition module to start acquiring the temperature of the compressor body and the exhaust temperature of the compressor.
8. A control system for preventing overheating of a compressor of an inverter air conditioner, comprising:
the temperature acquisition module is used for acquiring the temperature of the compressor body and the exhaust temperature of the compressor;
the comparison module is used for comparing the temperature difference value between the temperature of the compressor body and the exhaust temperature with a preset temperature difference interval in the comparison module so as to determine the temperature difference interval where the temperature difference value between the temperature of the compressor body and the exhaust temperature is located; and
the control module is used for controlling the compressor to execute corresponding variable frequency operation or abnormal stop operation according to a temperature interval where the exhaust temperature of the compressor is located and a temperature interval where a temperature difference value between the temperature of the compressor body and the exhaust temperature of the compressor is located; wherein
The control module is configured to control the compressor to operate at a temperature differential value between the temperature of the compressor body and the discharge temperature of the compressor at (0, t 1)]Is controlled to be rapidly increased at a first speed V1, and the value of the temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is (t1, t 2)]Is controlled to slowly increase the frequency of the compressor at a second speed V2, and the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is controlled to be (t)2，t3]The temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is (t3, t 4) while the frequency of the compressor is controlled to be constant]The temperature difference interval of the compressor is controlled to be slowly reduced at a second speed V3, and the temperature difference value between the temperature of the compressor body and the discharge temperature of the compressor is (t4, t)5]Controlling the compressor to rapidly decrease at a second speed V4 during the temperature difference interval;
wherein t5> t4> t3> t2> t1, V1> V2, and V4> V3.
9. The control system of claim 8, wherein
The minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under the working condition of the rated maximum refrigerating capacity and the working condition of the rated maximum heating capacity, which are preset in the comparison module, of the compressor running at the highest frequency is larger than the minimum endpoint value of the temperature interval corresponding to the abnormal stop of the compressor under any other working condition.
10. The control system of claim 8, further comprising:
the comparison module is used for comparing the exhaust temperature of the compressor with a preset temperature interval in the comparison module to determine the temperature interval of the exhaust temperature of the compressor; wherein
The control module is configured to control the compressor to discharge air at a temperature of (0, T)1]During a temperature interval of (3) controlling the compressor at a first speed V1Fast ramp-up at discharge temperature of said compressor at (T)1，T2]During a temperature interval of (c) control the compressor to a second speed V2Slow ramp-up at discharge temperature of said compressor at (T)2，T3]Is controlled so that the frequency of the compressor remains constant during the temperature interval of (f), the discharge temperature of the compressor being at (T)3，T4]During a temperature interval of (c) control the compressor to a second speed V3Slow down, at discharge temperature of the compressor at (T)4，T5]During a temperature interval of (c) control the compressor to a second speed V4Fast ramp down, at discharge temperature of the compressor at (T)5Infinity) or a value of a temperature difference between the temperature of the compressor body and the discharge temperature of the compressor is in (t)5And ∞) temperature difference interval, wherein T is the time period for controlling the compressor to execute abnormal stop operation5>T4>T3>T2>T1。
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| CN201710448991.3A CN107255340B (en) | 2017-06-14 | 2017-06-14 | Control method and control system for preventing compressor of inverter air conditioner from overheating |
| PCT/CN2018/087627 WO2018228135A1 (en) | 2017-06-14 | 2018-05-21 | Control method and system for preventing compressor overheating of variable-frequency air conditioner |
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| CN107255340B (en) * | 2017-06-14 | 2020-02-04 | 青岛海尔空调器有限总公司 | Control method and control system for preventing compressor of inverter air conditioner from overheating |
| CN108361929A (en) * | 2018-02-11 | 2018-08-03 | 广东美的制冷设备有限公司 | Control method and control device, storage medium and mobile air-conditioner |
| CN108592167A (en) * | 2018-04-04 | 2018-09-28 | 深圳市深蓝新能源电气有限公司 | Frequency conversion heat pump driver temperature-control circuit |
| CN109099636B (en) * | 2018-07-23 | 2021-04-20 | 海尔智家股份有限公司 | Refrigerator and compressor frequency control method thereof |
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| CN111219859B (en) * | 2018-11-23 | 2021-07-06 | 奥克斯空调股份有限公司 | Air conditioner operation frequency protection method and air conditioner |
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| CN110030707B (en) * | 2019-04-04 | 2021-03-19 | 广东美的暖通设备有限公司 | Air conditioning system adjusting method, air conditioner and computer readable storage medium |
| CN111023420B (en) * | 2019-12-27 | 2021-08-20 | 宁波奥克斯电气股份有限公司 | Compressor quick start control method and device, air conditioner and storage medium |
| CN111397140A (en) * | 2020-04-14 | 2020-07-10 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner |
| CN112197408B (en) * | 2020-10-13 | 2022-04-01 | 广东美的制冷设备有限公司 | Heating control method of compressor winding, air conditioner control method, system and equipment |
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| CN113654224A (en) * | 2021-07-26 | 2021-11-16 | 青岛海尔空调器有限总公司 | Frequency control method and device of air conditioner compressor and air conditioner |
| CN113639453B (en) * | 2021-08-13 | 2023-02-17 | 青岛海尔空调器有限总公司 | Method and device for controlling frequency stability of air conditioner compressor and electronic equipment |
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| CN107255340A (en) | 2017-10-17 |
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