CN109163424B - Double-temperature-difference control method and system of variable frequency air conditioner - Google Patents
Double-temperature-difference control method and system of variable frequency air conditioner Download PDFInfo
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- CN109163424B CN109163424B CN201811065737.6A CN201811065737A CN109163424B CN 109163424 B CN109163424 B CN 109163424B CN 201811065737 A CN201811065737 A CN 201811065737A CN 109163424 B CN109163424 B CN 109163424B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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Abstract
The invention provides a double-temperature-difference control method and a double-temperature-difference control system for a variable frequency air conditioner, wherein the method comprises the following steps: detecting the indoor environment temperature in real time in a refrigeration mode; acquiring a set temperature and a preset human body comfortable temperature of the variable frequency air conditioner; confirm first difference in temperature and second difference in temperature, the first difference in temperature does indoor ambient temperature with the difference in temperature of settlement temperature, the second difference in temperature does indoor ambient temperature with the difference in temperature of human comfortable temperature: and adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference. The double-temperature-difference control method provided by the invention improves the comfort level of the air conditioner during refrigeration and also reduces the energy consumption.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a double-temperature-difference control method and a double-temperature-difference control system for a variable frequency air conditioner.
Background
At present, the technical trend of the inverter air conditioner is comfort and health, and most of control mainly uses the temperature difference between a set temperature and an ambient temperature to control the frequency of a compressor so as to achieve the effect of rapid cooling. In practice, the air outlet temperature of the air conditioner is about 8-12 ℃, the air outlet temperature of the compressor is lower than 8 ℃ during high-frequency powerful operation, and the long-time operation comfort is poor.
Disclosure of Invention
In view of this, the present invention is directed to a dual temperature difference control method for an inverter air conditioner, so as to solve the problem of poor comfort of the air conditioner during long-time cooling.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a double-temperature-difference control method of a variable frequency air conditioner comprises the following steps:
detecting the indoor environment temperature in real time in a refrigeration mode;
acquiring a set temperature and a preset human body comfortable temperature of the variable frequency air conditioner;
determining a first temperature difference and a second temperature difference, wherein the first temperature difference is the temperature difference between the indoor environment temperature and the set temperature, and the second temperature difference is the temperature difference between the indoor environment temperature and the comfortable temperature of the human body;
and adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference.
Further, the adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference includes:
determining a frequency reduction coefficient, wherein the frequency reduction coefficient is the ratio of the indoor environment temperature to the comfortable temperature of the human body; determining a first operation target frequency of the compressor according to the first temperature difference, and determining a second operation target frequency of the compressor according to the first temperature difference and the frequency reduction coefficient;
judging whether the second temperature difference is not less than zero;
if so, controlling the compressor to operate at the first operation target frequency;
and if the judgment result is negative, controlling the compressor to operate at the second operation target frequency.
Further, after detecting the indoor ambient temperature in real time in the cooling mode, the method further includes: recording the continuous operation time of the compressor.
Further, the calculation formula of the first operation target frequency is as follows:
where FLc1 is the first operating target frequency, T1 is the continuous operating time of the compressor, Δ T1 is the first temperature difference, FL is the compressor minimum operating limit frequency, and FCH is the compressor maximum operating limit frequency.
Further, the calculation formula of the second operation target frequency is as follows:
where FLc2 is the second operation target frequency, T1 is the continuous operation time of the compressor, Δ T1 is the first temperature difference, FL is the compressor minimum operation limit frequency, FCH is the compressor maximum operation limit frequency, and K is the down-conversion coefficient.
Further, the controlling the compressor to operate at the second operation target frequency includes:
acquiring the current operating frequency of the compressor, and judging whether the current operating frequency of the compressor is the same as the second operating target frequency or not;
if the current operating frequency of the compressor is different from the second operating target frequency, acquiring the operating time of the compressor for maintaining the current operating frequency, and judging whether the operating time of the compressor for maintaining the current operating frequency reaches a set threshold value;
if the running time of the compressor for keeping the current running frequency reaches a set threshold value, controlling the compressor to run at the second running target frequency; and if the running time of the compressor for keeping the current running frequency does not reach the set threshold value, controlling the compressor to continuously keep the current running frequency running, and obtaining the running time of the compressor for keeping the current running frequency again for judgment.
Further, the setting range of the setting threshold is [3min,5min ].
Compared with the prior art, the double-temperature-difference control method of the variable frequency air conditioner has the following advantages:
(1) the double-temperature-difference control method of the variable frequency air conditioner introduces the comfortable temperature of a human body, adjusts the running frequency of the compressor according to the temperature difference between the indoor environment temperature and the set temperature and the temperature difference between the indoor environment temperature and the comfortable temperature, realizes double-temperature-difference control, and pointedly improves the comfort level of the air conditioner during refrigeration; meanwhile, the constant of the frequency reduction coefficient is increased, and finally the indoor environment temperature is close to the comfortable temperature by adjusting the operating frequency of the compressor, so that the comfort level of the air conditioner during refrigeration is improved.
(2) The double-temperature-difference control method of the variable frequency air conditioner requires that the compressor keeps the original frequency to operate for a period of time before the operation frequency is switched, and then the switching of a new target frequency value is carried out, so that the overlarge indoor temperature fluctuation caused by rapid frequency reduction is avoided, the comfort of the air conditioner during refrigeration is further improved, and the energy consumption is also reduced.
Another objective of the present invention is to provide a dual temperature difference control system to solve the problem of poor comfort of the air conditioner during long-time cooling.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a double-temperature-difference control system of an inverter air conditioner corresponding to the double-temperature-difference control method of the inverter air conditioner comprises the following steps: temperature sensor, temperature setting module, controller and compressor:
the temperature sensor is used for detecting the indoor environment temperature in real time in a refrigeration mode;
the temperature setting module is used for acquiring the set temperature of the variable frequency air conditioner and the preset comfortable temperature of the human body;
the controller is used for determining the first temperature difference and the second temperature difference, the first temperature difference is the temperature difference between the indoor environment temperature and the set temperature, and the second temperature difference is the temperature difference between the indoor environment temperature and the comfortable temperature of the human body; and adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference.
Further, the adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference in the controller includes:
determining a frequency reduction coefficient, wherein the frequency reduction coefficient is the ratio of the indoor environment temperature to the human body comfortable temperature; determining a first operation target frequency of the compressor according to the first temperature difference, and determining a second operation target frequency of the compressor according to the first temperature difference and the frequency reduction coefficient;
judging whether the second temperature difference is not less than zero;
if so, controlling the compressor to operate at the first operation target frequency;
and if the judgment result is negative, controlling the compressor to operate at the second operation target frequency.
Further, the dual temperature difference control system further includes: and the timing module is used for recording the continuous running time of the compressor.
Compared with the prior art, the advantages of the double-temperature-difference control system and the double-temperature-difference control method are the same, and are not described herein again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a dual temperature difference control method according to an embodiment of the present invention;
FIG. 2 is a flowchart of step S400 of the dual temperature difference control method according to the embodiment of the present invention
Fig. 3 is a flowchart of step S430 in the dual temperature difference control method according to the embodiment of the invention;
fig. 4 is a flowchart of step S440 of the dual temperature difference control method according to the embodiment of the invention;
fig. 5 is a block diagram of a dual temperature difference control system according to an embodiment of the present invention.
Description of reference numerals:
1-temperature sensor, 2-temperature setting module, 3-controller, 4-compressor, 5-timing module.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in fig. 1, which is a flowchart of a dual temperature difference control method of a variable frequency air conditioner in this embodiment, and is combined with fig. 2, the dual temperature difference control method of the variable frequency air conditioner in this embodiment includes the following steps:
s100: detecting indoor environment temperature TA in real time in a refrigeration mode;
s200: acquiring a set temperature TS and a preset human body comfortable temperature TR of the variable frequency air conditioner;
s300: determining a first temperature difference delta T1 and a second temperature difference delta T2, wherein the first temperature difference delta T1 is the temperature difference between the indoor environment temperature TA and the set temperature TS, and the second temperature difference delta T2 is the temperature difference between the indoor environment temperature TA and the human body comfortable temperature TR;
s400: adjusting an operating frequency of the compressor according to the first temperature difference Δ T1 and the second temperature difference Δ T2, wherein:
s410: determining a frequency reduction coefficient K, wherein the frequency reduction coefficient K is the ratio of the indoor environment temperature TA to the human body comfortable temperature TR: determining a first operation target frequency FLc1 of the compressor according to the first temperature difference delta T1, and determining a second operation target frequency FLc2 of the compressor according to the first temperature difference delta T1 and the frequency reduction coefficient K;
s420: judging whether the second temperature difference delta T2 is not less than zero;
s430: if the judgment result is yes, controlling the compressor to operate at a first operation target frequency FLc 1;
s440: if the judgment result is negative, the compressor is controlled to operate at the second operation target frequency FLc 2.
Wherein, step S100 further includes: the continuous running time t1 of the compressor is recorded.
In step S410, the calculation formula of the first operation target frequency FLc1 is:
the calculation formula of the second operation target frequency FLc2 is:
in the formula, FLc1 is a first operation target frequency, FLc2 is a second operation target frequency, T1 is the continuous operation time of the compressor, Δ T1 is a first temperature difference, FL is the lowest operation limit frequency of the compressor, FCH is the highest operation limit frequency of the compressor, and K is the frequency reduction coefficient.
The variable frequency air conditioner is started, after the variable frequency air conditioner enters a refrigeration mode, the temperature sensor detects the air temperature at the air inlet of the air conditioner in real time, and the timing module starts to record the continuous running time t1 of the compressor; the air temperature at the air inlet of the air conditioner is the indoor environment temperature TA, the temperature sensor sends the detected indoor environment temperature TA to the controller, and the controller receives the current indoor environment temperature TA; the air conditioner remote controller obtains a set temperature TS currently set by a user and a human body comfortable temperature TR set when an air conditioner leaves a factory, the set temperature TS and the human body comfortable temperature TR are sent to the controller, the controller calculates the temperature difference between the indoor environment temperature TA and the set temperature TS according to the current indoor environment temperature TA, the set temperature TS and the human body comfortable temperature TR, the temperature difference serves as a first temperature difference delta T1, namely delta T1 is TA-TS, the temperature difference between the indoor environment temperature TA and the human body comfortable temperature TR serves as a second temperature difference delta T2, namely delta T2 is TA-TR, the ratio of the indoor environment temperature TA to the human body comfortable temperature TR is calculated, and the frequency reduction coefficient K is used as a frequency reduction coefficient K, namely K is TA/TR; according to the numerical range of the first temperature difference delta T1 and the continuous operation time T1 of the compressor, calculating formulas of a first operation target frequency FLc1 and a second operation target frequency FLc2 corresponding to the compressor are selected, and the first operation target frequency FLc1 and the second operation target frequency FLc2 are calculated according to the formulas; and judging whether the second temperature difference delta T2 is not less than zero, if the delta T2 is not less than 0, controlling the compressor to operate at the first operation target frequency FLc1, and if the delta T2 is less than 0, controlling the compressor to operate at the second operation target frequency FLc2, so that the operation frequency of the compressor in the refrigeration mode is adjusted through the first temperature difference delta T1 and the second temperature difference delta T2.
When the human body comfortable temperature TR, the frequency-reducing coefficient K, the second temperature difference delta T2 and the second operation target frequency FLc2 are not introduced, the air conditioner is used for refrigerating, when the first temperature difference delta T1 is larger than or equal to 3 due to the fact that the set temperature TS set by a user through a remote controller is low, the first operation target frequency FLc1 of the compressor is equal to the highest operation limiting frequency FCH of the compressor, the compressor is enabled to operate in a high-frequency section all the time, the outlet air temperature is lower than 8 ℃, the compressor operates for a long time, the comfort of outlet air of the air conditioner is affected, air conditioner diseases are easily caused, the health of a human body is affected, the compressor operates in the high-frequency section for a long time. In the method in the embodiment, the comfortable temperature TR of the human body is introduced, the second operation target frequency FLc2 is calculated according to the first temperature difference delta T1 and the frequency reduction coefficient K, and the operation target frequency of the compressor is determined by judging whether the second temperature difference delta T2 is not less than zero, so that the double-temperature-difference control is realized. Thus, when the set temperature TS is lower and the first temperature difference Δ T1 is greater than or equal to 3, the indoor environment temperature TA gradually decreases with the increase of the cooling time, and when the indoor environment temperature TA decreases to be less than the human body comfortable temperature TR, the second temperature difference Δ T2 is less than 0, the compressor operates at the second operation target frequency FLc2, and since the second operation target frequency FLc2 is FCH × K and the down conversion coefficient K is less than 1 at this time, the calculated second operation target frequency FLc2 is less than the maximum operation limiting frequency FCH of the compressor, so that the compressor operates at a frequency section less than the maximum operation limiting frequency FCH, and the influence of the air conditioner comfort level due to the excessively low outlet air temperature is avoided.
When the air conditioner operates in scenes such as sleep and the like, the double-temperature-difference control method improves the air outlet temperature of the air conditioner, controls the air outlet temperature of the air conditioner to be about 8-12 ℃, reduces the probability of air conditioner diseases such as cold, headache and the like, improves the health of the air conditioner, and also enables the energy-saving and consumption-reducing effects of the air conditioner to be better.
Preferably, the comfortable temperature of the human body is 25 ℃, and the temperature can be adjusted adaptively according to actual conditions.
Example 2
As described above, the present embodiment is different from the above-mentioned dual temperature difference control method in that, as shown in fig. 3, step S430 in the present embodiment includes the following steps:
s431: acquiring the current operating frequency of the compressor;
s432: judging whether the current operating frequency of the compressor is the same as the first operating target frequency FLc 1;
s433: if the current operating frequency of the compressor is different from the first operating target frequency FLc1, acquiring the operating time for keeping the current operating frequency of the compressor;
s434: judging whether the running time of the compressor for keeping the current running frequency reaches a set threshold value or not;
s435: if the running time of the compressor for keeping the current running frequency reaches the set threshold value, controlling the compressor to run at a second running target frequency FLc 2; if the operation time of the compressor for keeping the current operation frequency does not reach the set threshold, the operation returns to step S433.
As shown in fig. 4, step S440 in the present embodiment includes the following steps:
s441: acquiring the current operating frequency of the compressor;
s442: judging whether the current operating frequency of the compressor is the same as the second operating target frequency FLc 2;
s443: if the current operating frequency of the compressor is different from the second operating target frequency FLc2, acquiring the operating time for keeping the current operating frequency of the compressor;
s444: judging whether the running time of the compressor for keeping the current running frequency reaches a set threshold value or not;
s445: if the running time of the compressor for keeping the current running frequency reaches the set threshold value, controlling the compressor to run at a second running target frequency FLc 2; if the operation time for the compressor to maintain the current operation frequency does not reach the set threshold, the process returns to step S443.
Therefore, after the operation target frequency of the compressor is determined, whether the current operation frequency of the compressor is the same as the calculated operation target frequency is judged, if yes, the compressor keeps the original frequency operation, and only if not, the next judgment is carried out, so that the whole control process is more reasonable and reliable.
After judging that the current operating frequency of the compressor is different from the calculated operating target frequency, the controller does not immediately control the compressor to switch a new target frequency, but firstly judges whether the operating time of the compressor for keeping the current operating frequency reaches a set threshold value; if the judgment result is yes, controlling the compressor to switch the new target frequency value; if the judgment result is negative, the running time of the compressor for keeping the current running frequency is obtained again, whether the running time of the compressor for keeping the current running frequency reaches the set threshold value is judged again, and the compressor is controlled to switch the new target frequency value until the judgment result is positive, so that the phenomenon that the comfortableness is influenced due to overlarge indoor temperature fluctuation caused by the rapid frequency reduction of the compressor can be avoided.
Example 3
The above-mentioned dual temperature difference control method is different from the present embodiment in that the setting range of the setting threshold in the present embodiment is [3min,5min ].
The present embodiment preferably sets the threshold value to 5min, i.e. the controller makes one adjustment of the operating frequency of the compressor every 5 minutes, and so on. After the compressor runs for 5 minutes, the evaporator in the air conditioner absorbs partial heat in the room through heat exchange, the indoor environment temperature TA is reduced, the difference between the indoor environment temperature TA and the air outlet temperature of the air conditioner is reduced, the compressor is controlled to switch a new target frequency value at the moment, the fluctuation of the indoor temperature is small, and a certain buffering effect is achieved, so that the comfort level of the variable frequency air conditioner during refrigeration is further improved.
Optionally, the setting range of the set threshold may also be adaptively modified according to the actual situation.
Example 4
The present embodiment is different from the above-mentioned dual temperature difference control method in that the rate of switching the compressor from the current operation frequency to the target frequency is 1 HZ/2S.
Therefore, the compressor can increase/decrease the frequency at a constant speed of 1HZ/2S until reaching the target frequency, so as to complete the frequency adjustment and ensure the stable operation of the compressor.
Example 5
As shown in fig. 5, the dual temperature difference control system in this embodiment includes a temperature sensor 1, a temperature setting module 2, a controller 3, a compressor 4, and a timing module 5:
the temperature sensor 1 is used for detecting the indoor environment temperature TA in real time in a refrigeration mode;
a timing module 5 for recording the continuous running time t1 of the compressor 4;
the temperature setting module 2 is used for acquiring a set temperature TS and a preset human body comfortable temperature TR of the variable frequency air conditioner;
the controller 3 is used for determining a first temperature difference delta T1 and a second temperature difference delta T2, wherein the first temperature difference delta T1 is the temperature difference between the indoor environment temperature TA and the set temperature TS, and the second temperature difference delta T2 is the temperature difference between the indoor environment temperature TA and the human body comfortable temperature TR; the operating frequency of the compressor 4 is adjusted according to the first temperature difference Δ T1 and the second temperature difference Δ T2.
Specifically, the adjusting of the operating frequency of the compressor 4 in the controller 3 according to the first temperature difference Δ T1 and the second temperature difference Δ T2 includes:
determining a frequency reduction coefficient K, wherein the frequency reduction coefficient K is the ratio of the indoor environment temperature TA to the human body comfortable temperature TR; determining a first operating target frequency FLc1 of the compressor 4 as a function of the first temperature difference Δ T1; determining a second operating target frequency FLc2 of the compressor 4 according to the first temperature difference Δ T1 and the frequency reduction coefficient K;
judging whether the second temperature difference delta T2 is not less than zero;
if the judgment result is yes, controlling the compressor 4 to operate at the first operation target frequency FLc 1;
if the determination result is negative, the compressor 4 is controlled to operate at the second operation target frequency FLc 2.
After the air conditioner starts a refrigeration mode, the temperature sensor 1 senses the air temperature of an indoor air inlet in real time, the timing module 5 starts to record the continuous running time t1 of the compressor 4, the air temperature is the indoor environment temperature TA, and the temperature sensor 1 sends the detected current indoor environment temperature TA to the controller 3; the temperature setting module 2 acquires a set temperature TS currently set by a user and a human body comfortable temperature TR set when the air conditioner leaves a factory, and sends the set temperature TS and the human body comfortable temperature TR to the controller 3; after receiving the temperature signals sent by the temperature sensor 1 and the temperature setting module 2, the controller 3 calculates a temperature difference between the indoor environment temperature TA and the set temperature TS according to the received current indoor environment temperature TA, the set temperature TS and the human body comfortable temperature TR, calculates a temperature difference between the indoor environment temperature TA and the human body comfortable temperature TR as a first temperature difference Δ T1, namely Δ T1 TA-TS, calculates a temperature difference between the indoor environment temperature TA and the human body comfortable temperature TR as a second temperature difference Δ T2, namely Δ T2 TA-TR, calculates a ratio of the indoor environment temperature TA to the human body comfortable temperature TR as a frequency reduction coefficient K, namely K TA/TR; the controller 3 selects a calculation formula of a first operation target frequency FLc1 and a second operation target frequency FLc2 corresponding to the compressor 4 according to the numerical range of the first temperature difference Δ T1 and the continuous operation time T1 of the compressor 4, and calculates the first operation target frequency FLc1 and the second operation target frequency FLc2 according to the formula; the controller 3 determines whether the second temperature difference Δ T2 is not less than zero, controls the compressor 4 to operate at the first operation target frequency FLc1 if the second temperature difference Δ T2 is not less than 0, controls the compressor 4 to operate at the second operation target frequency FLc2 if the second temperature difference Δ T2 is less than 0, and transmits the calculated operation target frequency signal to the electronic expansion valve of the compressor 4, and the operation frequency of the compressor 4 is adjusted by controlling the electronic expansion valve to increase/decrease the opening degree.
The control system of the present embodiment determines whether the compressor 4 is the first operation target frequency FLc1 or the second operation target frequency FLc2 as the current operation target frequency by increasing the setting of the comfortable temperature TR of the human body in the temperature setting module 2 and increasing the calculation of the second temperature difference Δ T2, the down-conversion coefficient K, and the second actual operation target frequency FLc2 in the controller 3, and the controller 3 determines whether the second temperature difference Δ T2 is not less than zero, and finally controls the compressor 4 to operate at the operation target frequency. Thus, when the user sets the set temperature TS to be lower so that the first temperature difference Δ T1 is greater than or equal to 3, the controller 3 selects the calculation formula corresponding to the first operation target frequency FLc1 according to the value range in which the first temperature difference Δ T1 falls as follows: FLc1 is FCH, and the second operation target frequency FLc2 corresponds to the following calculation formula: FLc2 ═ FCH × K; as the indoor ambient temperature TA is gradually decreased with the increase of the cooling time, and when the indoor ambient temperature TA is decreased to be less than the human body comfortable temperature TR, the second temperature difference Δ T2 is less than 0, the compressor 4 operates at the second operation target frequency FLc2, and as the second operation target frequency FLc2 is FCH K and the frequency reduction coefficient K is less than 1, the calculated second operation target frequency FLc2 is less than the maximum operation limiting frequency FCH of the compressor, and the compressor 4 operates at a frequency section less than the maximum operation limiting frequency FCH, the influence on the comfort and health of the air conditioner due to the low outlet air temperature is avoided, and energy and power are saved.
Example 6
The present embodiment is different from the above-described dual temperature difference control system in that the controller 3 in the present embodiment controls the compressor 4 to operate at the first operation target frequency FLc1, and includes:
acquiring a current operating frequency of the compressor 4;
judging whether the current operating frequency of the compressor 4 is the same as the first operating target frequency FLc 1;
if the current operating frequency of the compressor 4 is different from the first operating target frequency FLc1, acquiring the operating time for keeping the current operating frequency of the compressor;
judging whether the running time of the compressor 4 for keeping the current running frequency reaches a set threshold value;
controlling the compressor 4 to operate at the first operation target frequency FLc1 if the operation time for the compressor 4 to maintain the current operation frequency reaches the set threshold value; and if the running time of the compressor 4 for keeping the current running frequency does not reach the set threshold value, the running time of the compressor 4 for keeping the current running frequency is obtained again and judged.
The controller 3 controls the compressor 4 to operate at the second operation target frequency FLc2, including:
acquiring a current operating frequency of the compressor 4;
judging whether the current operating frequency of the compressor 4 is the same as the second operating target frequency FLc 2;
if the current operating frequency of the compressor 4 is different from the second operating target frequency FLc2, acquiring the operating time for keeping the current operating frequency of the compressor;
judging whether the running time of the compressor 4 for keeping the current running frequency reaches a set threshold value;
controlling the compressor 4 to operate at the second operation target frequency FLc2 if the operation time for the compressor 4 to maintain the current operation frequency reaches the set threshold value; and if the running time of the compressor 4 for keeping the current running frequency does not reach the set threshold value, the running time of the compressor 4 for keeping the current running frequency is obtained again and judged.
In this way, after the controller 3 determines the operation target frequency of the compressor 4, it is first determined whether the current operation frequency of the compressor 4 is the same as the calculated operation target frequency, if so, the controller controls the compressor 4 to maintain the original frequency operation, and only if not, the controller performs the next determination, thereby improving the rationality and reliability of the control system.
After judging that the current operating frequency of the compressor 4 is different from the calculated operating target frequency, the controller 3 does not immediately control the compressor 4 to switch to a new target frequency, but firstly judges whether the operating time of the compressor 4 for keeping the current operating frequency reaches a set threshold value; if the judgment result is yes, controlling the compressor 4 to switch the new target frequency value; if the judgment result is negative, the running time of the compressor 4 for keeping the current running frequency is obtained again and judged until the running time of the compressor 4 for keeping the original running frequency reaches the set threshold value, and then the compressor 4 is controlled to switch the new target frequency value, so that the phenomenon that the indoor temperature fluctuation caused by the rapid frequency reduction of the compressor 4 is too large and the comfortableness is influenced can be avoided.
Further, the setting range of the threshold is set to [3min,5min ], and the present embodiment preferably sets the threshold to 5min, that is, the controller 3 adjusts the operating frequency of the compressor 4 every 5 minutes, and so on. After the compressor 4 runs for 5 minutes, the evaporator in the air conditioner absorbs partial heat in the room through heat exchange, the indoor environment temperature TA is reduced, the difference between the indoor environment temperature TA and the air outlet temperature of the air conditioner is reduced, the compressor 4 is controlled to switch a new target frequency value at the moment, the fluctuation of the indoor temperature is small, and a certain buffering effect is achieved, so that the comfort level of the variable frequency air conditioner during refrigeration is further improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A double-temperature-difference control method of a variable frequency air conditioner is characterized by comprising the following steps:
detecting the indoor environment temperature in real time in a refrigeration mode;
acquiring a set temperature and a preset human body comfortable temperature of the variable frequency air conditioner;
determining a first temperature difference and a second temperature difference, wherein the first temperature difference is the temperature difference between the indoor environment temperature and the set temperature, and the second temperature difference is the temperature difference between the indoor environment temperature and the comfortable temperature of the human body;
adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference;
adjusting the operating frequency of the compressor according to the first temperature difference and the second temperature difference comprises:
determining a frequency reduction coefficient, wherein the frequency reduction coefficient is the ratio of the indoor environment temperature to the comfortable temperature of the human body;
determining a first operation target frequency of the compressor according to the first temperature difference, and determining a second operation target frequency of the compressor according to the first temperature difference and the frequency reduction coefficient;
judging whether the second temperature difference is not less than zero;
if so, controlling the compressor to operate at the first operation target frequency;
and if the judgment result is negative, controlling the compressor to operate at the second operation target frequency.
2. The dual temperature difference control method according to claim 1, further comprising, after detecting the indoor ambient temperature in real time in the cooling mode: recording the continuous operation time of the compressor.
3. The dual temperature difference control method according to claim 1, wherein the calculation formula of the first operation target frequency is:
where FLc1 is the first operating target frequency, T1 is the continuous operating time of the compressor, Δ T1 is the first temperature difference, FL is the compressor minimum operating limit frequency, and FCH is the compressor maximum operating limit frequency.
4. The dual temperature difference control method according to claim 1, wherein the calculation formula of the second operation target frequency is:
where FLc2 is the second operation target frequency, T1 is the continuous operation time of the compressor, Δ T1 is the first temperature difference, FL is the compressor minimum operation limit frequency, FCH is the compressor maximum operation limit frequency, and K is the down-conversion coefficient.
5. The dual temperature differential control method of claim 1, wherein the controlling the compressor to operate at the second operating target frequency comprises:
acquiring the current operating frequency of the compressor, and judging whether the current operating frequency of the compressor is the same as the second operating target frequency or not;
if the current operating frequency of the compressor is different from the second operating target frequency, acquiring the operating time of the compressor for maintaining the current operating frequency, and judging whether the operating time of the compressor for maintaining the current operating frequency reaches a set threshold value;
if the running time of the compressor for keeping the current running frequency reaches a set threshold value, controlling the compressor to run at the second running target frequency; and if the running time of the compressor for keeping the current running frequency does not reach the set threshold value, controlling the compressor to continuously keep the current running frequency running, and obtaining the running time of the compressor for keeping the current running frequency again for judgment.
6. The dual temperature difference control method according to claim 5, wherein the set threshold is set within a range of [3min,5min ].
7. A double-temperature-difference control system of an inverter air conditioner corresponding to the double-temperature-difference control method of the inverter air conditioner as claimed in any one of claims 1 to 6, wherein the double-temperature-difference control system comprises: the temperature control system comprises a temperature sensor (1), a temperature setting module (2), a controller (3) and a compressor (4);
the temperature sensor (1) is used for detecting the indoor environment temperature in real time in a refrigeration mode;
the temperature setting module (2) is used for acquiring the set temperature of the variable frequency air conditioner and the preset comfortable temperature of the human body;
the controller (3) is used for determining the first temperature difference and the second temperature difference, the first temperature difference is the temperature difference between the indoor environment temperature and the set temperature, and the second temperature difference is the temperature difference between the indoor environment temperature and the comfortable temperature of the human body; adjusting the operating frequency of the compressor (4) according to the first temperature difference and the second temperature difference;
adjusting an operating frequency of the compressor (4) in the controller (3) according to the first temperature difference and the second temperature difference, comprising:
determining a frequency reduction coefficient, wherein the frequency reduction coefficient is the ratio of the indoor environment temperature to the comfortable temperature of the human body; determining the first target operating frequency of the compressor (4) from the first temperature difference, determining the second target operating frequency of the compressor (4) from the first temperature difference and the frequency reduction factor;
judging whether the second temperature difference is not less than zero;
if the judgment result is yes, controlling the compressor (4) to operate at the first operation target frequency;
and if the judgment result is negative, controlling the compressor (4) to operate at the second operation target frequency.
8. The dual differential temperature control system of claim 7, further comprising: a timing module (5) for recording the continuous running time of the compressor (4).
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| CN111426000B (en) * | 2019-01-10 | 2021-08-06 | 青岛海尔空调电子有限公司 | Air conditioner control method and device and computer storage medium |
| CN110207327B (en) * | 2019-05-27 | 2020-09-01 | 珠海格力电器股份有限公司 | Control method and device of air conditioner compressor and air conditioner |
| CN110173852B (en) * | 2019-05-28 | 2022-01-25 | 宁波奥克斯电气股份有限公司 | Frequency control method of air conditioner and air conditioner |
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