CN108758975B - Control method and system of air conditioner system and air conditioner - Google Patents
Control method and system of air conditioner system and air conditioner Download PDFInfo
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- CN108758975B CN108758975B CN201810600902.7A CN201810600902A CN108758975B CN 108758975 B CN108758975 B CN 108758975B CN 201810600902 A CN201810600902 A CN 201810600902A CN 108758975 B CN108758975 B CN 108758975B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
Abstract
The invention discloses a control method and system of an air conditioner system and an air conditioner. The control method of the air conditioning system comprises the following steps: after the compressor runs for a preset time in the refrigeration mode, judging whether the unit output rate of the air conditioning system is greater than a first threshold value or not; if so, further judging whether the refrigerant coefficient is between a lower threshold and an upper threshold, wherein the lower threshold is smaller than the upper threshold; if the refrigerant coefficient is between the lower limit threshold value and the upper limit threshold value, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor so as to change the refrigerant circulation quantity timely; if the refrigerant coefficient is larger than the upper limit threshold value, the opening degree of the electronic expansion valve is increased; and if the refrigerant coefficient is smaller than the lower limit threshold value, reducing the opening degree of the electronic expansion valve. The control method of the air conditioning system can enable the air conditioning system to be always in the optimal refrigerant circulation amount, ensures that the air conditioning system operates in a more efficient and energy-saving mode, and improves the use experience.
Description
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a control method and system of an air conditioning system and an air conditioner.
Background
In order to make the air conditioning system develop towards the direction of better energy-saving and efficient operation, in the related art, a high-end air conditioner has better energy consumption and operation performance than a bottom air conditioner, and on one hand, the high-end air conditioner is realized by hardware improvement, but the cost of the high-end air conditioner is higher. And the air conditioning system is more energy-saving and efficient to operate through the control logic of the air conditioner.
However, there are the following common disadvantages: the control logic of the air conditioning system cannot enable the air conditioning system to be in a high-efficiency operation state all the time according to the operation characteristics of the unit, so that the heat transfer efficiency of the heat exchanger cannot be effectively exerted, and the actual operation effect of the unit of the whole air conditioning system is further influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, an object of the present invention is to provide a control method for an air conditioning system, which can reasonably adjust the opening of an electronic expansion valve according to a refrigerant coefficient, so that the air conditioning system is always in an optimal refrigerant circulation amount, thereby improving the heat exchange efficiency and the operation reliability of the air conditioning system, ensuring that the air conditioning system operates in a more efficient and energy-saving manner, and improving the use experience.
Another object of the present invention is to provide a control system of an air conditioning system.
It is a further object of the present invention to provide an air conditioner.
In order to achieve the above object, an embodiment of a first aspect of the present invention discloses a control method of an air conditioning system, including the steps of: after the compressor runs for a preset time in the refrigeration mode, judging whether the unit output rate of the air conditioning system is greater than a first threshold value or not; if so, further judging whether the refrigerant coefficient is between a lower threshold and an upper threshold, wherein the lower threshold is smaller than the upper threshold; if the refrigerant coefficient is between the lower limit threshold value and the upper limit threshold value, adjusting the opening degree of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the refrigerant circulation quantity timely; if the refrigerant coefficient is larger than the upper limit threshold value, the opening degree of the electronic expansion valve is increased; and if the refrigerant coefficient is smaller than the lower limit threshold value, reducing the opening degree of the electronic expansion valve.
According to the control method of the air conditioning system, the opening degree of the electronic expansion valve can be reasonably adjusted according to the refrigerant coefficient, so that the air conditioning system is always in the optimal refrigerant circulation amount, the heat exchange efficiency and the operation reliability of the air conditioning system are improved, the air conditioning system is ensured to operate in a more efficient and energy-saving mode, and the use experience is improved.
In some examples, the unit output rate of the air conditioning system is: actual capacity requirement of the air conditioning system/total capacity requirement of the air conditioning system.
In some examples, the refrigerant coefficient is: (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); or (the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outdoor environment temperature); or (saturation temperature corresponding to the discharge pressure of the compressor-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to the discharge pressure of the compressor-outdoor ambient temperature).
In some examples, the increasing the opening degree of the electronic expansion valve if the refrigerant coefficient is greater than the upper threshold when the unit output rate of the air conditioning system is greater than or equal to the second threshold includes: if the refrigerant coefficient is larger than the first upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the first lower limit threshold value, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; when the unit output rate of the air conditioning system is greater than the first threshold value and less than the second threshold value, if the refrigerant coefficient is greater than the upper threshold value, increasing the opening degree of the electronic expansion valve, including: if the refrigerant coefficient is larger than the second upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the second lower threshold, gradually decreasing the opening degree of the electronic expansion valve at the preset interval time, wherein the second threshold is larger than the first threshold, the first upper threshold is larger than or equal to the second upper threshold, the first lower threshold is larger than or equal to the second lower threshold, and [ the first lower threshold, the first upper threshold ] is larger than or equal to [ the second lower threshold, the second upper threshold ].
In some examples, when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control method further includes: judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not; if not, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
In some examples, further comprising: and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
An embodiment of a second aspect of the present invention discloses a control system of an air conditioning system, including: the judging module is used for judging whether the unit output rate of the air conditioning system is greater than a first threshold value after the compressor operates for a preset time in the refrigeration mode, and further judging whether a refrigerant coefficient is between a lower limit threshold value and an upper limit threshold value when the unit output rate of the air conditioning system is greater than the first threshold value, wherein the lower limit threshold value is smaller than the upper limit threshold value; the control module is used for adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor when the refrigerant coefficient is between the lower limit threshold value and the upper limit threshold value so as to change the refrigerant circulation quantity timely, increasing the opening of the electronic expansion valve when the refrigerant coefficient is larger than the upper limit threshold value, and reducing the opening of the electronic expansion valve when the refrigerant coefficient is smaller than the lower limit threshold value.
According to the control system of the air conditioning system, disclosed by the embodiment of the invention, the opening degree of the electronic expansion valve can be reasonably adjusted according to the refrigerant coefficient, so that the air conditioning system is always in the optimal refrigerant circulation amount, the heat exchange efficiency and the operation reliability of the air conditioning system are improved, the air conditioning system is ensured to operate in a more efficient and energy-saving mode, and the use experience is improved.
In some examples, the unit output rate of the air conditioning system is: actual capacity requirement of the air conditioning system/total capacity requirement of the air conditioning system.
In some examples, the refrigerant coefficient is: (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); or (the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outdoor environment temperature); or (saturation temperature corresponding to the discharge pressure of the compressor-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to the discharge pressure of the compressor-outdoor ambient temperature).
In some examples, the upper threshold includes a first upper threshold and a second upper threshold, the lower threshold includes a first lower threshold and a second lower threshold, and the control module is to: when the unit output rate of the air conditioning system is greater than or equal to a second threshold value, if the refrigerant coefficient is greater than the upper limit threshold value, increasing the opening degree of the electronic expansion valve, including: if the refrigerant coefficient is larger than the first upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the first lower limit threshold value, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; when the unit output rate of the air conditioning system is greater than the first threshold value and less than the second threshold value, if the refrigerant coefficient is greater than the upper threshold value, increasing the opening degree of the electronic expansion valve, including: if the refrigerant coefficient is larger than the second upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the second lower threshold, gradually decreasing the opening degree of the electronic expansion valve at the preset interval time, wherein the second threshold is larger than the first threshold, the first upper threshold is larger than or equal to the second upper threshold, the first lower threshold is larger than or equal to the second lower threshold, and [ the first lower threshold, the first upper threshold ] is larger than or equal to [ the second lower threshold, the second upper threshold ].
In some examples, when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control module is further configured to: judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not; if not, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
In some examples, the control module is further to: and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
An embodiment of a third aspect of the present invention discloses an air conditioner, including: an indoor unit; an outdoor unit including: a compressor and an outdoor heat exchanger; and a control system of an air conditioning system according to the embodiment of the second aspect described above. This air conditioner can be according to refrigerant coefficient rationally adjust electronic expansion valve's aperture, makes the air conditioner be in the best refrigerant circulation volume all the time to improve the heat exchange efficiency of air conditioner and the reliability of operation, guarantee that the air conditioner operates with more high-efficient energy-conserving mode, promote to use and experience.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention.
Fig. 2 is a flowchart of a control method of an air conditioning system according to another embodiment of the present invention.
Fig. 3 is a control logic diagram for adjusting an opening degree of an electronic expansion valve according to a discharge temperature of a compressor in a control method of an air conditioning system according to another embodiment of the present invention;
fig. 4 is a block diagram of a control system of an air conditioning system according to another embodiment of the present invention.
Reference numerals:
the air conditioning system comprises a control system 400 of the air conditioning system, a judgment module 410 and a control module 420.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The following describes a control method and system of an air conditioning system and an air conditioner according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention. As shown in fig. 1 in combination with fig. 2, a control method of an air conditioning system according to an embodiment of the present invention includes the steps of:
s101: and after the compressor runs for a preset time in the refrigeration mode, judging whether the unit output rate of the air conditioning system is greater than a first threshold value.
In a specific example, the predetermined time is, for example, 30 minutes, and of course, 30 minutes is merely exemplary and may be appropriately adjusted as necessary.
The unit output rate m of the air conditioning system is the actual capacity requirement of the air conditioning system/the total capacity requirement of the air conditioning system, namely: the unit output rate m is the ratio between the actual capacity requirement of the air conditioning system and the total capacity requirement of the air conditioning system.
The first threshold is, for example, 30%, and of course, 30 minutes is merely exemplary and may be appropriately adjusted as necessary.
S102: if yes, further judging whether the refrigerant coefficient is between a lower threshold and an upper threshold, wherein the lower threshold is smaller than the upper threshold. The lower threshold and the upper threshold are usually obtained by pre-calibration according to requirements.
In a specific example of the present invention, the refrigerant coefficient n is:
(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); alternatively, the first and second electrodes may be,
(saturation temperature corresponding to inlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to inlet pressure of the outdoor heat exchanger-outdoor ambient temperature); alternatively, the first and second electrodes may be,
(saturation temperature corresponding to discharge pressure of the compressor-outlet pipe temperature of the outdoor heat exchanger)/(saturation temperature corresponding to discharge pressure of the compressor-outdoor ambient temperature).
Taking (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet line temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor environment temperature) as an example, the refrigerant coefficient n is (Tb-Tc)/(Tb-Th), where Tb is saturation temperature corresponding to outlet pressure of the outdoor heat exchanger, Tc is outlet line temperature of the outdoor heat exchanger, Tb is saturation temperature corresponding to outlet pressure of the outdoor heat exchanger, and Th is outdoor environment temperature.
For example: the outlet pressure P1 of the outdoor heat exchanger is detected through the pressure sensor, and then the saturation temperature Tb corresponding to the outlet pressure of the outdoor heat exchanger is determined according to the outlet pressure P1 of the outdoor heat exchanger. The outlet pipeline temperature Tc and the outdoor environment temperature Th of the outdoor heat exchanger can be detected by corresponding temperature sensors.
S103: if the refrigerant coefficient is between the lower threshold and the upper threshold, the opening of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor so as to change the refrigerant circulation quantity timely.
That is, when the operation time of the compressor reaches 30 minutes in the refrigeration mode, the unit output rate m of the air conditioning system is greater than 30%, and the refrigerant coefficient n is between the lower limit threshold and the upper limit threshold, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so as to change the refrigerant circulation amount timely.
As shown in fig. 3, the method for adjusting the opening degree of the electronic expansion valve according to the discharge temperature of the compressor to change the circulation amount of the refrigerant at a proper time includes: when the opening degree of the electronic expansion valve is adjusted by the exhaust temperature of the compressor, the exhaust temperature of the compressor is divided into an ascending section and a descending section, and when the exhaust temperature is in a descending process from low to high, the opening degree of the electronic expansion valve is gradually increased, for example, when the exhaust temperature is increased from T1 to T3, the opening degree of the electronic expansion valve is changed from A to B. When the exhaust temperature is in the descending process from high to low, the opening degree of the electronic expansion valve is gradually reduced. For example, when the exhaust gas temperature is decreased from T6 to T4, the opening degree of the electronic expansion valve is decreased from C to B. Wherein, A is more than B and less than C and less than D and less than E, T1 is more than T3 and less than T5 and less than T7, T2 is more than T4 and less than T6 and less than T8.
S104: and if the refrigerant coefficient is larger than the upper limit threshold value, increasing the opening degree of the electronic expansion valve.
That is, when the operation time of the compressor reaches 30 minutes in the cooling mode, the unit output rate m of the air conditioning system is greater than 30%, and the refrigerant coefficient n is greater than the upper limit threshold value, the opening degree of the electronic expansion valve is increased.
Specifically, the upper threshold includes a first upper threshold b and a second upper threshold d, the lower threshold includes a first lower threshold a and a second lower threshold c,
when the unit output rate m of the air conditioning system is greater than or equal to the second threshold, if the refrigerant coefficient is greater than the upper threshold, the opening degree of the electronic expansion valve is increased, including:
if the refrigerant coefficient m is larger than the first upper limit threshold value b, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient m is smaller than the first lower limit threshold value a, gradually reducing the opening degree of the electronic expansion valve at preset interval time;
when the unit output rate m of the air conditioning system is greater than a first threshold value and less than a second threshold value, if the refrigerant coefficient is greater than an upper limit threshold value, the opening degree of the electronic expansion valve is increased, and the method comprises the following steps:
if the refrigerant coefficient m is larger than a second upper limit threshold value d, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient m is less than the second lower threshold value c, the opening degree of the electronic expansion valve is gradually reduced at preset intervals,
wherein, the second threshold is larger than the first threshold, the first upper threshold b is larger than or equal to the second upper threshold d, the first lower threshold a is larger than or equal to the second lower threshold c, and [ the first lower threshold a, the first upper threshold b ] is larger than or equal to [ the second lower threshold c, the second upper threshold d ].
Taking the first threshold value of 30%, the second threshold value of 70%, and the predetermined interval time of 2 minutes as an example, then:
and when m is larger than or equal to 70%, automatically calculating the saturation temperature Tb corresponding to the outlet pressure P1 of the outdoor heat exchanger, and calculating the current refrigerant coefficient n.
Then, whether the refrigerant coefficient n is between a and b is judged, if yes, the opening degree of the electronic expansion valve is adjusted by the exhaust temperature Tp of the compressor. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
And if the refrigerant coefficient n is not between a and b, further judging whether n > b is established, if so, opening the electronic expansion valve by a preset unit amount, and adjusting once every 2 minutes.
And when m is more than 30% and less than 70%, automatically calculating the saturation temperature Tb corresponding to the outlet pressure P1 of the outdoor heat exchanger, and calculating the current refrigerant coefficient n.
And then, judging whether the refrigerant coefficient n is between c and d, if so, adjusting the opening degree of the electronic expansion valve according to the exhaust temperature of the compressor. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
And if the refrigerant coefficient n is not between c and d, further judging whether n > d is true, if so, opening the electronic expansion valve by a preset unit amount, and adjusting once every 2 minutes.
S105: and if the refrigerant coefficient n is smaller than the lower limit threshold value, reducing the opening degree of the electronic expansion valve.
Taking the first threshold value of 30%, the second threshold value of 70%, and the predetermined interval time of 2 minutes as an example, then:
and when m is larger than or equal to 70%, automatically calculating the saturation temperature Tb corresponding to the outlet pressure P1 of the outdoor heat exchanger, and calculating the current refrigerant coefficient n.
Then, whether the refrigerant coefficient n is between a and b is judged, if yes, the opening degree of the electronic expansion valve is adjusted by the exhaust temperature Tp of the compressor. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
And if the refrigerant coefficient n is not between a and b, further judging whether n < a is established, if so, closing the electronic expansion valve by the opening degree of a preset unit amount, and adjusting once every 2 minutes.
And if the refrigerant coefficient n < a is not satisfied, returning to the upper-layer judgment logic to further judge the range of the unit output rate m.
And when m is more than 30% and less than 70%, automatically calculating the saturation temperature Tb corresponding to the outlet pressure P1 of the outdoor heat exchanger, and calculating the current refrigerant coefficient n.
And then, judging whether the refrigerant coefficient n is between c and d, if so, adjusting the opening degree of the electronic expansion valve according to the exhaust temperature of the compressor. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
If the refrigerant coefficient n is not between c and d, further judging whether n < c is established, if so, closing the electronic expansion valve by the opening degree of the preset unit amount, and adjusting once every 2 minutes.
And if the refrigerant coefficient n < c is not satisfied, returning to the upper-layer judgment logic to further judge the range of the unit output rate m.
As shown in fig. 2, in an embodiment of the present invention, when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control method further includes: judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not; if not, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
Taking the first threshold value as 30% and the preset temperature as 10 ℃ as an example, if m is less than or equal to 30%, further judging whether the discharge superheat degree x of the compressor is less than or equal to 10 ℃, if not, closing the electronic expansion valve by the opening degree of the preset unit amount, and adjusting once every 2 minutes. If the temperature of the air is higher than the preset temperature, the opening degree of the electronic expansion valve is automatically controlled in a mode of regulating the exhaust temperature of the compressor, so that the reliability of the operation of the compressor and the air conditioning system is ensured. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
As shown in fig. 2, in an embodiment of the present invention, the control method further includes: and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
That is, if the operation time of the compressor is less than 30 minutes in the cooling mode, the opening degree of the electronic expansion valve is adjusted according to the discharge temperature of the compressor to change the refrigerant circulation amount at a proper time. The opening degree of the electronic expansion valve is adjusted according to the discharge temperature Tp of the compressor, as shown in the above example.
According to the control method of the air conditioning system, the opening degree of the electronic expansion valve can be reasonably adjusted according to the refrigerant coefficient, so that the air conditioning system is always in the optimal refrigerant circulation amount, the heat exchange efficiency and the operation reliability of the air conditioning system are improved, the air conditioning system is ensured to operate in a more efficient and energy-saving mode, and the use experience is improved.
Fig. 4 is a block diagram of a control system of an air conditioning system according to an embodiment of the present invention. As shown in fig. 4, a control system 400 of an air conditioning system according to an embodiment of the present invention includes: a decision block 410 and a control block 420.
The determining module 410 is configured to determine whether a unit output rate of the air conditioning system is greater than a first threshold after the compressor operates in the cooling mode for a predetermined time, and further determine whether a refrigerant coefficient is located between a lower threshold and an upper threshold when the unit output rate of the air conditioning system is greater than the first threshold, where the lower threshold is smaller than the upper threshold. The control module 420 is configured to adjust an opening degree of the electronic expansion valve according to an exhaust temperature of the compressor when the refrigerant coefficient is between a lower threshold and an upper threshold, so as to change a refrigerant circulation amount in time, increase the opening degree of the electronic expansion valve when the refrigerant coefficient is greater than the upper threshold, and decrease the opening degree of the electronic expansion valve when the refrigerant coefficient is less than the lower threshold.
In an embodiment of the present invention, the unit output rate of the air conditioning system is: actual capacity requirement of the air conditioning system/total capacity requirement of the air conditioning system.
In an embodiment of the present invention, the refrigerant coefficient is: (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); or (the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outdoor environment temperature); or (saturation temperature corresponding to the discharge pressure of the compressor-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to the discharge pressure of the compressor-outdoor ambient temperature).
In an embodiment of the present invention, the upper threshold includes a first upper threshold and a second upper threshold, the lower threshold includes a first lower threshold and a second lower threshold, and the control module 420 is configured to: when the unit output rate of the air conditioning system is greater than or equal to a second threshold value, if the refrigerant coefficient is greater than the upper limit threshold value, increasing the opening degree of the electronic expansion valve, including: if the refrigerant coefficient is larger than the first upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the first lower limit threshold value, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; when the unit output rate of the air conditioning system is greater than the first threshold value and less than the second threshold value, if the refrigerant coefficient is greater than the upper threshold value, increasing the opening degree of the electronic expansion valve, including: if the refrigerant coefficient is larger than the second upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time; if the refrigerant coefficient is smaller than the second lower threshold, gradually decreasing the opening degree of the electronic expansion valve at the preset interval time, wherein the second threshold is larger than the first threshold, the first upper threshold is larger than or equal to the second upper threshold, the first lower threshold is larger than or equal to the second lower threshold, and [ the first lower threshold, the first upper threshold ] is larger than or equal to [ the second lower threshold, the second upper threshold ].
In an embodiment of the present invention, when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control module 420 is further configured to: judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not; if not, gradually reducing the opening degree of the electronic expansion valve at the preset interval time; if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
In an embodiment of the present invention, the control module 420 is further configured to: and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
According to the control system of the air conditioning system, disclosed by the embodiment of the invention, the opening degree of the electronic expansion valve can be reasonably adjusted according to the refrigerant coefficient, so that the air conditioning system is always in the optimal refrigerant circulation amount, the heat exchange efficiency and the operation reliability of the air conditioning system are improved, the air conditioning system is ensured to operate in a more efficient and energy-saving mode, and the use experience is improved.
It should be noted that the specific implementation manner of the control system of the air conditioning system according to the embodiment of the present invention is similar to the specific implementation manner of the control method of the air conditioning system according to the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not described here in order to reduce redundancy.
Further, an embodiment of the present invention discloses an air conditioner, including: an indoor unit; an outdoor unit including: a compressor and an outdoor heat exchanger; and a control system of an air conditioning system according to the above embodiment. This air conditioner can be according to refrigerant coefficient rationally adjust electronic expansion valve's aperture, makes the air conditioner be in the best refrigerant circulation volume all the time to improve the heat exchange efficiency of air conditioner and the reliability of operation, guarantee that the air conditioner operates with more high-efficient energy-conserving mode, promote to use and experience.
In addition, other configurations and functions of the air conditioner according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A control method of an air conditioning system is characterized by comprising the following steps:
after the compressor runs for a preset time in the refrigeration mode, judging whether the unit output rate of the air conditioning system is greater than a first threshold value or not; wherein, the unit output rate of the air conditioning system is as follows: actual capacity requirement of the air conditioning system/total capacity requirement of the air conditioning system;
if so, further judging whether the refrigerant coefficient is between a lower threshold and an upper threshold, wherein the lower threshold is smaller than the upper threshold; wherein, the refrigerant coefficient is: (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); or (the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outdoor environment temperature); or (the saturation temperature corresponding to the discharge pressure of the compressor-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the discharge pressure of the compressor-the outdoor environment temperature);
if the refrigerant coefficient is between the lower limit threshold value and the upper limit threshold value, adjusting the opening degree of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the refrigerant circulation quantity timely;
if the refrigerant coefficient is larger than the upper limit threshold value, the opening degree of the electronic expansion valve is increased;
if the refrigerant coefficient is smaller than the lower limit threshold value, the opening degree of the electronic expansion valve is reduced;
when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control method further includes:
judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not;
if not, gradually reducing the opening degree of the electronic expansion valve at preset interval time;
if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
2. The control method of an air conditioning system according to claim 1, wherein the upper threshold value includes a first upper threshold value and a second upper threshold value, and the lower threshold value includes a first lower threshold value and a second lower threshold value,
when the unit output rate of the air conditioning system is greater than or equal to a second threshold value, if the refrigerant coefficient is greater than the upper limit threshold value, increasing the opening degree of the electronic expansion valve, including:
if the refrigerant coefficient is larger than the first upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient is smaller than the first lower limit threshold value, gradually reducing the opening degree of the electronic expansion valve at the preset interval time;
when the unit output rate of the air conditioning system is greater than the first threshold value and less than the second threshold value, if the refrigerant coefficient is greater than the upper threshold value, increasing the opening degree of the electronic expansion valve, including:
if the refrigerant coefficient is larger than the second upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient is less than the second lower threshold, gradually reducing the opening degree of the electronic expansion valve at the preset interval time,
wherein the second threshold is greater than the first threshold, the first upper threshold is greater than or equal to the second upper threshold, the first lower threshold is greater than or equal to the second lower threshold, and [ first lower threshold, first upper threshold ] is greater than or equal to [ second lower threshold, second upper threshold ].
3. The control method of an air conditioning system according to claim 1, further comprising:
and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
4. A control system for an air conditioning system, comprising:
the judging module is used for judging whether the unit output rate of the air conditioning system is greater than a first threshold value after the compressor operates for a preset time in the refrigeration mode, and further judging whether a refrigerant coefficient is between a lower limit threshold value and an upper limit threshold value when the unit output rate of the air conditioning system is greater than the first threshold value, wherein the lower limit threshold value is smaller than the upper limit threshold value; wherein, the unit output rate of the air conditioning system is as follows: actual capacity requirement of the air conditioning system/total capacity requirement of the air conditioning system;
wherein, the refrigerant coefficient is: (saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outlet pipeline temperature of the outdoor heat exchanger)/(saturation temperature corresponding to outlet pressure of the outdoor heat exchanger-outdoor ambient temperature); or (the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the inlet pressure of the outdoor heat exchanger-the outdoor environment temperature); or (the saturation temperature corresponding to the discharge pressure of the compressor-the outlet pipeline temperature of the outdoor heat exchanger)/(the saturation temperature corresponding to the discharge pressure of the compressor-the outdoor environment temperature);
the control module is used for adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor when the refrigerant coefficient is between a lower limit threshold value and an upper limit threshold value so as to change the refrigerant circulation quantity timely, increasing the opening of the electronic expansion valve when the refrigerant coefficient is greater than the upper limit threshold value, and reducing the opening of the electronic expansion valve when the refrigerant coefficient is less than the lower limit threshold value;
when the unit output rate of the air conditioning system is less than or equal to the first threshold, the control module is further configured to:
judging whether the discharge superheat degree of the compressor is less than or equal to a preset temperature or not;
if not, gradually reducing the opening degree of the electronic expansion valve at preset interval time;
if yes, the opening degree of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the circulation amount of the refrigerant is changed timely.
5. The control system of claim 4, wherein the upper threshold comprises a first upper threshold and a second upper threshold, and the lower threshold comprises a first lower threshold and a second lower threshold, and wherein the control module is configured to:
when the unit output rate of the air conditioning system is greater than or equal to a second threshold value, if the refrigerant coefficient is greater than the upper limit threshold value, increasing the opening degree of the electronic expansion valve, including:
if the refrigerant coefficient is larger than the first upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient is smaller than the first lower limit threshold value, gradually reducing the opening degree of the electronic expansion valve at the preset interval time;
when the unit output rate of the air conditioning system is greater than the first threshold value and less than the second threshold value, if the refrigerant coefficient is greater than the upper threshold value, increasing the opening degree of the electronic expansion valve, including:
if the refrigerant coefficient is larger than the second upper limit threshold value, gradually increasing the opening degree of the electronic expansion valve at preset interval time;
if the refrigerant coefficient is less than the second lower threshold, gradually reducing the opening degree of the electronic expansion valve at the preset interval time,
wherein the second threshold is greater than the first threshold, the first upper threshold is greater than or equal to the second upper threshold, the first lower threshold is greater than or equal to the second lower threshold, and [ first lower threshold, first upper threshold ] is greater than or equal to [ second lower threshold, second upper threshold ].
6. The control system of an air conditioning system of claim 4, wherein the control module is further configured to:
and when the running time of the compressor in the refrigeration mode is less than the preset time, adjusting the opening of the electronic expansion valve according to the exhaust temperature of the compressor so as to change the circulation volume of the refrigerant timely.
7. An air conditioner, comprising:
an indoor unit;
an outdoor unit including: a compressor and an outdoor heat exchanger; and
a control system for an air conditioning system as claimed in any of claims 4 to 6.
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| CN109682021B (en) * | 2018-12-13 | 2021-05-14 | 青岛海信日立空调系统有限公司 | Outdoor unit protection method and device and air conditioning system |
| CN110068179B (en) * | 2019-04-22 | 2021-04-27 | 广东美博制冷设备有限公司 | Control method and device of electronic expansion valve |
| CN111425996B (en) * | 2020-02-26 | 2022-11-22 | 青岛海尔空调电子有限公司 | Control method of air conditioner |
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