CN106288204B - Comfortable refrigeration control method for variable frequency air conditioner - Google Patents
Comfortable refrigeration control method for variable frequency air conditioner Download PDFInfo
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Abstract
The invention discloses a comfortable refrigeration control method of a variable frequency air conditioner, which comprises a process of executing PID control of coil temperature, wherein the process of executing PID control of the coil temperature comprises the following steps: acquiring real-time indoor environment temperature and real-time air conditioner set temperature, and comparing the real-time indoor environment temperature with a known first temperature threshold value; if the real-time indoor environment temperature is larger than the first temperature threshold value, determining a target coil temperature according to the real-time indoor environment temperature as a real-time target coil temperature; if the real-time indoor environment temperature is not greater than the first temperature threshold value, determining a target coil temperature according to the set real-time air conditioner temperature as a real-time target coil temperature; and acquiring the real-time coil temperature of the evaporator, and executing PID control of the coil temperature based on the real-time coil temperature and the real-time target coil temperature. The invention can meet the comfort requirements of different users.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a control method of a variable frequency air conditioner, and more particularly relates to a comfortable refrigeration control method of the variable frequency air conditioner.
Background
In summer, many people have a rest at night without turning on the air conditioner. When sleeping at night, the air conditioner is turned on, and the thick cotton quilt is covered, so that energy waste is caused, cold is easily caused by careless kicking of the quilt, and cold air is inhaled from the respiratory tract, so that the throat of a user is dry and painful. In recent years, people have become more conscious of health, have become more knowledgeable, and are important for comfort and health, and on the one hand, people do not want cold to invade the body, and on the other hand, people are hard to endure extremely hot and warm, and want to keep the temperature appropriate. But the current function of the air conditioner is that the user mostly uses the air conditioner: the air conditioner feels cold when the time is a little longer, and the air conditioner is heated after being turned off; the market user investigation situation is that many users use the dehumidification function at night, and the wind speed is set to be low or silent, so that the refrigeration is slow, and the users feel cold after sleeping for a long time.
For such a situation, it is important to maintain the critical state of body feeling, and a cold condition may affect health, while a hot condition may be uncomfortable. A comfort cooling control method is presented for this user pain point. The control process of the control method is as follows: firstly, a set temperature is taken as a target, a room temperature PID algorithm is adopted, so that the room temperature is rapidly and stably cooled, and the room temperature is higher in the process; when the room temperature is close to the comfortable temperature of a human body, a coil pipe temperature PID algorithm is started, the target coil pipe temperature is set, the temperature of the coil pipe is kept constant by controlling the frequency of the press, and the effect of cooling without cooling is achieved.
In the existing comfortable refrigeration control method, the target coil temperature in the coil temperature PID algorithm is a fixed temperature value, and different requirements of user groups with different requirements on body sensing temperature are difficult to meet.
Disclosure of Invention
The invention aims to provide a comfortable refrigeration control method of a variable frequency air conditioner, so as to meet the comfort of different users.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a comfortable refrigeration control method for a variable frequency air conditioner comprises a process of executing PID control of coil temperature, and a process of executing PID control of the coil temperature, and comprises the following steps:
acquiring real-time indoor environment temperature and real-time air conditioner set temperature, and comparing the real-time indoor environment temperature with a known first temperature threshold value;
if the real-time indoor environment temperature is larger than the first temperature threshold, determining a target coil temperature corresponding to the real-time indoor environment temperature according to the known corresponding relation between the target coil temperature and the indoor environment temperature, and taking the target coil temperature as the real-time target coil temperature; the corresponding relation between the target coil temperature and the indoor environment temperature is a negative correlation relation;
if the real-time indoor environment temperature is not greater than the first temperature threshold, determining a target coil temperature corresponding to the real-time air conditioner set temperature according to the known corresponding relation between the target coil temperature and the air conditioner set temperature, and taking the target coil temperature as the real-time target coil temperature; the corresponding relation between the target coil temperature and the set temperature of the air conditioner is a positive correlation;
and acquiring the real-time coil temperature of the evaporator, and executing PID control of the coil temperature based on the real-time coil temperature and the real-time target coil temperature.
In the above method, the correspondence between the target coil temperature and the indoor ambient temperature specifically includes:
target coil temperature = reference coil temperature-p 1 (indoor ambient temperature-first temperature threshold);
wherein the reference coil temperature is a known temperature value and the proportionality coefficient p1 is a positive number.
In the above method, the comparison relationship between the target coil temperature and the air conditioner set temperature specifically includes:
target coil temperature = reference coil temperature + p2 (air conditioner set temperature-second temperature threshold);
wherein the reference coil temperature and the second temperature threshold are both known temperature values, and the scaling factor p2 is a positive number.
The method for acquiring the real-time coil temperature of the evaporator specifically comprises the following steps:
acquiring the detection temperatures of at least two coil temperature detection points with different positions on the evaporator, and comparing the difference value of the detection temperatures of any two coil temperature detection points;
if the difference value of the detection temperatures of any two coil temperature detection points is not greater than the first difference value, selecting the detection temperature of any coil temperature detection point as the real-time coil temperature;
if at least one difference value of the detected temperatures of any two coil temperature detection points is larger than the first difference value and the difference values of the detected temperatures of any two coil temperature detection points are not larger than the second difference value, selecting the average value of the detected temperatures of all the coil temperature detection points as the real-time coil temperature;
if at least one difference value of the detected temperatures of any two coil temperature detection points is larger than the second difference value, selecting the minimum temperature of the detected temperatures of all the coil temperature detection points as the real-time coil temperature;
the first difference and the second difference are both known values, and the second difference is greater than the first difference.
Compared with the prior art, the invention has the advantages and positive effects that: when the coil temperature PID control is executed, the target coil temperature is adjusted in real time according to the real-time indoor environment temperature and the real-time air conditioner set temperature, the indoor environment temperature can be quickly reduced as an adjustment target when the indoor environment temperature is high, the comfort of the indoor environment temperature is realized, and the coil temperature can be timely adjusted according to the air conditioner set temperature reflecting the requirement of the user on the body sensing temperature, so that the indoor environment temperature obtained by the coil temperature PID control is more in line with the requirements of user groups with different body sensing temperature requirements.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a flowchart of an embodiment of a comfort cooling control method for a variable frequency air conditioner according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, a flowchart of an embodiment of a method for controlling comfort cooling of a variable frequency air conditioner according to the present invention is shown, and specifically, an embodiment of a process for performing PID control of a coil temperature in comfort cooling of an air conditioner is shown.
As shown in fig. 1, the PID control process of coil temperature in comfort cooling in this embodiment specifically includes a control process formed by the following steps:
step 11: and acquiring real-time indoor environment temperature and real-time air conditioner set temperature, and comparing the real-time indoor environment temperature with a known first temperature threshold value.
In this embodiment, when the coil temperature PID control is performed, the real-time indoor ambient temperature and the real-time air conditioner set temperature are acquired. The real-time indoor environment temperature is the current indoor environment temperature acquired according to the set sampling frequency and can be acquired through a temperature sensor arranged on an indoor unit of the air conditioner; the real-time air-conditioning set temperature refers to a target set temperature of the current air-conditioning operation, and generally refers to a user set temperature.
After the real-time indoor ambient temperature is obtained, the real-time indoor ambient temperature is compared to a first temperature threshold. The first temperature threshold is a known preset value which can be acquired by the air conditioner control module and is a reference value used for reflecting the current indoor environment temperature. Moreover, the first temperature threshold may be modified by authorization.
Step 12: and judging whether the real-time indoor environment temperature is greater than a first temperature threshold value. If yes, go to step 13; otherwise, step 14 is performed.
Step 13: if step 12 determines that the real-time indoor ambient temperature is greater than the first temperature threshold, the target coil temperature corresponding to the real-time indoor ambient temperature is determined according to the known correspondence between the target coil temperature and the indoor ambient temperature, and is used as the real-time target coil temperature. Then, step 15 is performed.
Wherein, the corresponding relation between the target coil temperature and the indoor environment temperature is a negative correlation relation. That is, the higher the indoor ambient temperature, the lower the target coil temperature. Moreover, the corresponding relation is obtained by air conditioner research personnel through a large amount of environment working condition experiments and by combining theoretical knowledge and analysis, is pre-stored and can be conveniently obtained by the air conditioner control module.
If the real-time indoor environment temperature is larger than the first temperature threshold value, the indoor temperature is high at the moment, and the comfort of the indoor environment temperature is adjusted to be the main control target at the moment. To quickly reduce the indoor temperature to a more comfortable low temperature, in this case, a lower real-time target coil temperature is determined as the target temperature for coil temperature PID control, and the real-time target coil temperature is an adjustable temperature that corresponds one-to-one to the real-time indoor ambient temperature. Because the lower the target coil temperature is, the lower the temperature of the air delivered by the air conditioner is, the more beneficial the indoor temperature can be reduced to a low temperature. Then, step 15 is performed.
Step 14: if the real-time indoor environment temperature is not larger than the first temperature threshold value, according to the known corresponding relation between the target coil temperature and the set temperature of the air conditioner, the target coil temperature corresponding to the set temperature of the real-time air conditioner is determined and used as the real-time target coil temperature. Then, step 15 is performed.
Wherein, the corresponding relation between the target coil temperature and the set temperature of the air conditioner is a positive correlation. That is, the higher the air conditioner set temperature, the higher the target coil temperature. Moreover, the corresponding relation is obtained by air conditioner research personnel through a large amount of environment working condition experiments and by combining theoretical knowledge and analysis, is pre-stored and can be conveniently obtained by the air conditioner control module.
If the real-time indoor environment temperature is not larger than the first temperature threshold value, the indoor temperature is not very high at the moment, the requirement for the body sensing temperature comfort of the user is taken as an adjusting target, and the body sensing temperature of the user can be reflected through the set temperature of the air conditioner. For example, a user who likes a cool may generally select a lower air conditioner set temperature, such as 22 ℃; if another user does not like too cool, a higher air conditioner set temperature, such as 26 c, is typically selected. Then, when the real-time indoor environment temperature is not greater than the first temperature threshold, the real-time target coil temperature is determined according to the one-to-one correspondence relationship positively correlated with the real-time indoor environment temperature as the target temperature for the PID control of the coil temperature. If the real-time indoor environment temperature is high, the real-time target coil pipe temperature is also high, and vice versa, so that the requirements of users with different somatosensory comfortable temperatures are met. Then, step 15 is performed.
Step 15: after the real-time target coil temperature is determined through step 13 or step 14, the real-time coil temperature of the evaporator is acquired, and coil temperature PID control is performed based on the real-time coil temperature and the real-time target coil temperature.
The real-time coil temperature of the evaporator is the current coil temperature of the indoor unit evaporator obtained according to the set sampling frequency, and can be obtained through a temperature sensor arranged at a coil temperature detection point of the indoor unit evaporator. And performing PID control on the coil temperature based on the real-time coil temperature and the real-time target coil temperature, namely calculating the temperature difference between the real-time coil temperature and the real-time target coil temperature to obtain the coil temperature difference, and performing PID calculation on the coil temperature according to the coil temperature difference. More specific control procedures can be implemented using existing technologies and will not be described in detail.
When the PID control of the coil temperature is executed by adopting the method, when the indoor environment temperature is higher, the reduction of the indoor environment temperature is taken as a main control target, and the target coil temperature is adjusted in real time according to the corresponding relation which is in negative correlation with the real-time indoor environment temperature, so that the comfort of the indoor environment temperature is realized; and when the indoor environment temperature is not very high, the temperature comfort of the user is taken as an adjusting target, the target coil temperature is adjusted in real time according to the corresponding relation which is in positive correlation with the set temperature of the real-time air conditioner, and the indoor environment temperature obtained by the PID control of the coil temperature is more in line with the requirements of user groups with different requirements on the temperature of the user.
For the corresponding relation between the target coil temperature and the indoor environment temperature, a pre-stored one-to-one correspondence table can be used, and the real-time target coil temperature corresponding to the real-time indoor environment temperature is obtained in a table look-up mode. In a preferred embodiment, a formula calculation method is adopted to obtain a real-time target coil temperature corresponding to the real-time indoor environment temperature. Specifically, the real-time target coil temperature corresponding to the real-time indoor ambient temperature is calculated using the following formula:
target coil temperature = reference coil temperature-p 1 (indoor ambient temperature-first temperature threshold).
Wherein the reference coil temperature is a known temperature value and the proportionality coefficient p1 is a known positive number. In addition, the reference coil temperature and the proportionality coefficient p1 are both pre-stored and can be conveniently obtained by an air conditioner control module, are values obtained by a large number of environment working condition experiments, theoretical knowledge and analysis of air conditioner research personnel, and can be modified through authorization.
For the corresponding relation between the target coil temperature and the air conditioner set temperature, the real-time target coil temperature corresponding to the real-time air conditioner set temperature can be obtained by a table look-up mode through a pre-stored one-to-one correspondence table. In a preferred embodiment, a formula calculation method is adopted to obtain the real-time target coil temperature corresponding to the real-time air conditioner set temperature. Specifically, the real-time target coil temperature corresponding to the real-time air conditioner set temperature is calculated by the following formula:
target coil temperature = reference coil temperature + p2 (air conditioner set temperature-second temperature threshold);
wherein the concept of the reference coil temperature is the same as described above. While the second temperature threshold is a known temperature value and the scaling factor p2 is a known positive number. Moreover, the second temperature threshold and the proportionality coefficient p2 are both pre-stored and can be conveniently obtained by the air conditioner control module, are values obtained by a large number of environment working condition experiments, theoretical knowledge and analysis of air conditioner research personnel, and can also be modified through authorization.
Step 15, when acquiring the real-time coil temperature of the evaporator, the real-time coil temperature can be acquired by setting a temperature detection point on the evaporator. As a more preferable real-time mode, in order to improve the accuracy of real-time coil temperature detection, especially the accuracy of large-area evaporator coil temperature detection, at least two coil temperature detection points with different positions are arranged on the evaporator, and the temperatures detected by all the detection points are used for determining the real-time coil temperature.
Specifically, the real-time coil temperature is determined in the following manner:
the method comprises the steps of obtaining detection temperatures of at least two coil temperature detection points with different positions on an evaporator, and comparing the difference of the detection temperatures of any two coil temperature detection points.
If the difference value of the detection temperatures of any two coil temperature detection points is not greater than the first difference value, selecting the detection temperature of any coil temperature detection point as the real-time coil temperature;
if at least one difference value of the detected temperatures of any two coil temperature detection points is larger than a first difference value and the difference values of the detected temperatures of any two coil temperature detection points are not larger than a second difference value, selecting the average value of the detected temperatures of all the coil temperature detection points as the real-time coil temperature;
and if at least one difference value in the detected temperature difference values of any two coil temperature detection points is larger than the second difference value, selecting the minimum temperature in the detected temperatures of all the coil temperature detection points as the real-time coil temperature.
The first difference value and the second difference value are known values, are stored in advance and can be conveniently acquired by the air conditioner control module, and the second difference value is larger than the first difference value.
The real-time coil temperature is determined by adopting the plurality of coil temperature detection points, the detection result is more accurate, and the indoor environment temperature is more comfortable in the coil temperature PID control process. And the air conditioning system operates more stably.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (2)
1. A comfortable refrigeration control method of a variable frequency air conditioner comprises a process of executing PID control of coil temperature, and is characterized in that the process of executing PID control of the coil temperature comprises the following steps:
acquiring real-time indoor environment temperature and real-time air conditioner set temperature, and comparing the real-time indoor environment temperature with a known first temperature threshold value;
if the real-time indoor environment temperature is larger than the first temperature threshold, determining a target coil temperature corresponding to the real-time indoor environment temperature according to the known corresponding relation between the target coil temperature and the indoor environment temperature, and taking the target coil temperature as the real-time target coil temperature; the corresponding relation between the target coil temperature and the indoor environment temperature is a negative correlation relation;
if the real-time indoor environment temperature is not greater than the first temperature threshold, determining a target coil temperature corresponding to the real-time air conditioner set temperature according to the known corresponding relation between the target coil temperature and the air conditioner set temperature, and taking the target coil temperature as the real-time target coil temperature; the corresponding relation between the target coil temperature and the set temperature of the air conditioner is a positive correlation;
acquiring the real-time coil temperature of an evaporator, and executing PID control on the coil temperature based on the real-time coil temperature and the real-time target coil temperature;
the corresponding relation between the target coil temperature and the indoor environment temperature specifically comprises the following steps:
target coil temperature = reference coil temperature-p 1 (indoor ambient temperature-first temperature threshold);
wherein the reference coil temperature is a known temperature value and the proportionality coefficient p1 is a positive number;
the comparison relation between the target coil temperature and the air conditioner set temperature specifically comprises the following steps:
target coil temperature = reference coil temperature + p2 (air conditioner set temperature-second temperature threshold);
wherein the reference coil temperature and the second temperature threshold are both known temperature values, and the scaling factor p2 is a positive number.
2. The method according to claim 1, wherein the obtaining of the real-time coil temperature of the evaporator is specifically:
acquiring the detection temperatures of at least two coil temperature detection points with different positions on the evaporator, and comparing the difference value of the detection temperatures of any two coil temperature detection points;
if the difference value of the detection temperatures of any two coil temperature detection points is not greater than the first difference value, selecting the detection temperature of any coil temperature detection point as the real-time coil temperature;
if at least one difference value of the detected temperatures of any two coil temperature detection points is larger than the first difference value and the difference values of the detected temperatures of any two coil temperature detection points are not larger than the second difference value, selecting the average value of the detected temperatures of all the coil temperature detection points as the real-time coil temperature;
if at least one difference value of the detected temperatures of any two coil temperature detection points is larger than the second difference value, selecting the minimum temperature of the detected temperatures of all the coil temperature detection points as the real-time coil temperature;
the first difference and the second difference are both known values, and the second difference is greater than the first difference.
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| CN106907826B (en) * | 2017-02-09 | 2019-07-19 | 美的集团股份有限公司 | Air conditioner temperature control method and device |
| CN108302712B (en) * | 2018-01-03 | 2020-04-10 | 广东美的暖通设备有限公司 | Heat pump air conditioning unit and energy-saving control method and control device thereof |
| CN109297152A (en) * | 2018-10-26 | 2019-02-01 | 广东美的制冷设备有限公司 | Air conditioner controlling device, air conditioner and its control method and readable storage medium storing program for executing |
| CN112361555B (en) * | 2020-11-09 | 2021-12-14 | 珠海格力电器股份有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
| CN113465129A (en) * | 2021-06-18 | 2021-10-01 | 青岛海尔空调电子有限公司 | Control method of air conditioner and air conditioner |
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Effective date of registration: 20200917 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: Qingdao Haier Parts Co., Ltd Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201103 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: Qingdao Haier Parts Co., Ltd Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: Qingdao Haier Parts Co., Ltd |