CN110726225A - Multi-split system and control method thereof - Google Patents

Multi-split system and control method thereof Download PDF

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Publication number
CN110726225A
CN110726225A CN201910967128.8A CN201910967128A CN110726225A CN 110726225 A CN110726225 A CN 110726225A CN 201910967128 A CN201910967128 A CN 201910967128A CN 110726225 A CN110726225 A CN 110726225A
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China
Prior art keywords
heat exchanger
opening degree
value
main heat
indoor
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CN201910967128.8A
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CN110726225B (en
Inventor
李友良
邓建云
李安民
郑涛
李兆辉
庄子宝
王军强
孙星星
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F24F2110/10—Temperature
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

Abstract

The invention provides a multi-split system and a control method thereof, wherein the multi-split system comprises an outdoor unit and a plurality of indoor units, the outdoor unit comprises a compressor, an outdoor heat exchanger and an intermediate heat exchanger, each indoor unit comprises an indoor main heat exchanger and an indoor auxiliary heat exchanger, and the method comprises the following steps: when the multi-split air conditioner system runs in a refrigeration mode or a dehumidification and reheating mode and the indoor unit is in superheat degree control, acquiring measurement parameters of the multi-split air conditioner system, acquiring outlet superheat degree of the indoor main heat exchanger, and calculating an opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger; and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions, and the opening adjustment value is greater than or equal to zero, acquiring the supercooling degree of the outdoor unit, and controlling the opening of the throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit, so that the refrigerant before entering the throttling component of the indoor unit is in a supercooling state, and the running abnormal sound is effectively reduced.

Description

Multi-split system and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split system and a control method thereof.
Background
In the multi-split air conditioning system in the related art, the three-pipe indoor unit is adopted to realize constant temperature dehumidification, but experimental research shows that when a refrigeration and dehumidification reheating mode is operated, when a refrigerant entering the three-pipe indoor unit is in a gas-liquid two-phase state, abnormal sound is generated when the refrigerant is throttled by an electronic expansion valve. For example, when the dehumidification regenerating mode is operated, the three-pipe indoor unit has the coupling effect of cold and hot refrigerants, so that abnormal sound is more obvious, and user experience is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a method for controlling a multi-split system, so as to effectively suppress abnormal operation sound and improve user experience.
A second object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a multi-split system, where the multi-split system includes an outdoor unit and a plurality of indoor units, the outdoor unit includes a compressor, an outdoor heat exchanger, and an intermediate heat exchanger, each of the indoor units includes an indoor main heat exchanger and an indoor auxiliary heat exchanger, and the method includes the following steps: when the multi-split air conditioner system runs in a refrigeration mode or a dehumidification and reheating mode and the indoor unit is in superheat degree control, acquiring measurement parameters of the multi-split air conditioner system, acquiring outlet superheat degree of the indoor main heat exchanger, and calculating an opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger; and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions, and the opening adjusting value is greater than or equal to zero, acquiring the supercooling degree of the outdoor unit, and controlling the opening of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit.
According to the control method of the multi-split system provided by the embodiment of the invention, when the measurement parameters of the multi-split system meet the preset entry conditions and the opening adjustment value is greater than or equal to zero, the opening of the throttling component of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit, so that the refrigerant before entering the throttling component of the indoor unit is in a supercooling state, the abnormal operation sound is effectively reduced, and the user experience is improved.
According to one embodiment of the invention, the measured parameters include an inlet temperature of an indoor main heat exchanger, a discharge temperature of the compressor, and the outdoor ambient temperature.
According to an embodiment of the invention, when the multi-split air conditioning system operates in a cooling mode, the preset entry condition comprises: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to a third temperature threshold; when the multi-split air conditioning system operates in a dehumidification and reheat mode, the preset entry conditions comprise: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to a fourth temperature threshold.
According to an embodiment of the present invention, the acquiring the supercooling degree of the outdoor unit includes: acquiring the inlet temperature and the outlet temperature of a first pipeline in the intermediate heat exchanger; and calculating the supercooling degree of the outdoor unit according to the inlet temperature and the outlet temperature of the first pipeline in the intermediate heat exchanger.
According to an embodiment of the present invention, the opening degree of the throttling part of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit: acquiring the outdoor environment temperature and acquiring the load rate of the multi-split system; determining a comparison threshold according to the outdoor environment temperature and the load factor; and controlling the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit and the comparison threshold value.
According to an embodiment of the present invention, the controlling the opening degree of the throttling part of the indoor main heat exchanger according to the supercooling degree of the outdoor unit and the comparison threshold includes: determining a first comparison threshold and a second comparison threshold according to the comparison threshold; when the supercooling degree of the outdoor unit is in an ascending trend and the supercooling degree of the outdoor unit is greater than or equal to the first comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and the supercooling degree of the outdoor unit is greater than or equal to the difference between the first comparison threshold value and the return difference value, controlling the opening of the throttling component of the indoor main heat exchanger in a first mode according to the opening adjusting value obtained through calculation; when the supercooling degree of the outdoor unit is in an ascending trend and is more than or equal to the second comparison threshold and less than the first comparison threshold, or the supercooling degree of the outdoor unit is in a descending trend and is more than or equal to the difference between the second comparison threshold and the return difference value and less than the difference between the first comparison threshold and the return difference value, controlling the opening of the throttling component of the indoor main heat exchanger in a second mode according to the calculated opening adjusting value; and when the supercooling degree of the outdoor unit is in an ascending trend and is smaller than the second comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and is smaller than the difference between the second comparison threshold value and the return difference value, keeping the opening degree of the throttling component of the indoor main heat exchanger unchanged.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions and the opening adjustment value is less than zero, and controlling the opening of the throttling component of the indoor main heat exchanger in a first mode according to the calculated opening adjustment value.
According to an embodiment of the present invention, controlling the opening degree of the throttling part of the indoor main heat exchanger in the first manner includes: comparing the absolute value of the calculated opening degree regulating value with a first opening degree range; if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of the first opening degree range and smaller than the upper limit value of the first opening degree range, controlling the opening degree of the throttling component of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the first opening degree range is a first opening degree value, and the upper limit value of the first opening degree range is the minimum value of the product of the current opening degree value of the throttling component of the indoor main heat exchanger and a first threshold value and a second opening degree value; if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the first opening degree range, controlling the opening degree of a throttling part of the indoor main heat exchanger by using the lower limit value of the first opening degree range; if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the first opening degree range, controlling the opening degree of a throttling part of the indoor main heat exchanger by using the upper limit value of the first opening degree range; the controlling the opening degree of the throttle member of the indoor main heat exchanger in the second manner includes: comparing the absolute value of the calculated opening degree regulating value with a second opening degree range; if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of the second opening degree range and smaller than the upper limit value of the second opening degree range, controlling the opening degree of the throttling component of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the second opening degree range is a first opening degree value, and the upper limit value of the second opening degree range is the minimum value of the product of the current opening degree value of the throttling component of the indoor main heat exchanger and a second threshold value and a second opening degree value; if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger according to the lower limit value of the second opening degree range; and if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger according to the upper limit value of the second opening degree range.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: and the multi-split air-conditioning system exits from the refrigeration mode or the dehumidification and reheating mode to operate, or the indoor unit exits from superheat degree control, or the opening degree of a throttling component of the indoor main heat exchanger is stopped to be controlled according to the supercooling degree of the outdoor unit when the measured parameter meets a preset exit condition.
According to an embodiment of the present invention, the preset exit condition includes: the inlet temperature of the indoor main heat exchanger is less than a first temperature threshold; or the discharge temperature of the compressor is greater than or equal to a second temperature threshold.
According to one embodiment of the invention, the calculating the opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger comprises the following steps: after the compressor is started for a first preset time, acquiring the exhaust temperature of the compressor, and determining a target superheat degree according to the exhaust temperature of the compressor; and calculating the opening degree adjusting value according to the difference between the outlet superheat degree of the indoor main heat exchanger and the target superheat degree.
According to an embodiment of the present invention, when the number of the indoor units that are opened is one, if the acquired discharge temperature is less than a third discharge temperature, the discharge temperature of the compressor is converted into the third discharge temperature so as to determine a target superheat degree from the third discharge temperature.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: when the number of the started indoor units is one, acquiring the exhaust temperature of the compressor after the compressor is started for a second preset time; when the exhaust temperature of the compressor is greater than or equal to a first exhaust temperature, controlling the indoor unit to exit superheat degree control; and after the indoor unit exits superheat degree control, controlling the opening degree of the throttling part of the indoor main heat exchanger to be increased until the exhaust temperature of the compressor is lower than a fourth exhaust temperature, keeping the opening degree of the throttling part of the indoor main heat exchanger unchanged, and controlling the indoor unit to enter superheat degree control when the exhaust temperature of the compressor is lower than a second exhaust temperature.
In order to achieve the above object, a second embodiment of the present invention provides a multi-split system, including: an outdoor unit including a compressor, an outdoor heat exchanger, and an intermediate heat exchanger; the indoor units comprise an indoor main heat exchanger and an indoor auxiliary heat exchanger; the control module is used for acquiring measurement parameters of the multi-split air conditioner system, acquiring the outlet superheat degree of the indoor main heat exchanger, calculating an opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger when the multi-split air conditioner system runs in a refrigeration mode or a dehumidification and reheating mode and the indoor unit is in superheat degree control, and acquiring the supercooling degree of the outdoor unit and controlling the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit when the measurement parameters of the multi-split air conditioner system meet preset entering conditions and the opening degree adjusting value is larger than or equal to zero.
According to the multi-split system provided by the embodiment of the invention, when the measurement parameters of the multi-split system meet the preset entry conditions and the opening adjustment value is greater than or equal to zero, the opening of the throttling component of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit, so that the refrigerant before entering the throttling component of the indoor unit is in a supercooling state, the abnormal operation sound is effectively reduced, and the user experience is improved.
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 a multi-split system according to an embodiment of the present invention;
fig. 2 is a flow chart illustrating a configuration of a multi-split system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of obtaining a target superheat degree in a control method of a multi-split system according to an embodiment of the invention;
fig. 4 is a schematic diagram illustrating a manner of acquiring a supercooling degree control in a control method of a multi-split system according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention;
(ii) a And
fig. 6 is a block diagram schematically illustrating a multi-split system according to an embodiment of the present invention.
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 drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
First, the structure of the lower multi-split system will be briefly described.
In an embodiment of the present invention, the multi-split system includes an outdoor unit and a plurality of indoor units, the outdoor unit includes a compressor, an outdoor heat exchanger and an intermediate heat exchanger, and each of the indoor units includes an indoor main heat exchanger and an indoor auxiliary heat exchanger.
Specifically, as shown in fig. 2, the outdoor unit 100 includes a compressor 101, a first four-way valve 102, a second four-way valve 103, an outdoor heat exchanger 104, a liquid pipe 105, a high-low pressure pipe 106, a gas pipe 107, a low-pressure tank 108, an outdoor main throttling part 109, an intermediate heat exchanger throttling part 110, an intermediate heat exchanger 111, and the like, wherein a d-end of the first four-way valve 102 and a d-end of the second four-way valve 103 are connected to an exhaust port of the compressor 101, an s-end of the first four-way valve 102 and an s-end of the second four-way valve 103 are connected to a suction port of the compressor 101 through the low-pressure tank 108, an e-end of the first four-way valve 102 is connected to the gas pipe 107, a c-end of the first four-way valve 102 is connected to a first end of the; the second end of the outdoor heat exchanger 104 is connected with the first end of the outdoor main throttling part 109; the second end of the outdoor main throttling element 109 is connected with the first end of the intermediate heat exchanger 111, namely the inlet of the first pipeline in the intermediate heat exchanger 111, and is also connected with the third end of the intermediate heat exchanger 111 through a capillary tube and an intermediate heat exchanger throttling element 110; the second end of the intermediate heat exchanger 111 is connected to the low pressure tank 108, and the fourth end of the intermediate heat exchanger 111, i.e. the outlet of the first pipe in the intermediate heat exchanger 111, is connected to the liquid pipe 105.
Each indoor unit 200 comprises an indoor main heat exchanger 201, an indoor auxiliary heat exchanger 202, an indoor main throttling part 203 and an indoor auxiliary throttling part 204, wherein a first end of the indoor main heat exchanger 201 is connected with a liquid pipe 105 of the outdoor unit 100 through the indoor main throttling part 203, and a second end of the indoor main heat exchanger 201 is connected with a gas pipe 107 of the outdoor unit 100; a first end of the indoor auxiliary heat exchanger 202 is connected to the liquid pipe 105 of the outdoor unit 100 through the indoor auxiliary throttle member 204, and a second end of the indoor auxiliary heat exchanger 202 is connected to the high and low pressure pipes 106 of the outdoor unit 100.
It should be noted that the structures and operating principles of the outdoor unit and the indoor unit belong to the prior art, and are well known to those skilled in the art, and detailed descriptions thereof are omitted.
As an example, in the embodiment of the present application, each throttling part may be an electronic expansion valve. The intermediate heat exchanger 111 may be a plate heat exchanger.
When the multi-split air conditioner system operates in the refrigeration, dehumidification and reheating modes, when the refrigerant entering the indoor unit is in a gas-liquid two-phase state, the indoor unit generates abnormal sound due to the coupling effect of the cold refrigerant and the hot refrigerant. Therefore, the invention provides a control method of a multi-split system.
A multi-split system and a control method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention. As shown in fig. 1, the control method of the multi-split system includes the steps of:
s1: when the multi-split air conditioning system runs in a refrigeration mode or a dehumidification and reheating mode and an indoor unit is in superheat degree control, measuring parameters of the multi-split air conditioning system are obtained, the outlet superheat degree of an indoor main heat exchanger is obtained, and an opening degree adjusting value is calculated according to the outlet superheat degree of the indoor main heat exchanger.
Wherein, in the refrigeration mode, indoor main heat exchanger and indoor supplementary heat exchanger all refrigerate the operation, liquid refrigerant gets into indoor main heat exchanger and indoor supplementary heat exchanger promptly, the refrigerant that vaporizes into gaseous state microthermal, thereby absorb a large amount of heats, in the refrigeration mode, indoor main heat exchanger refrigerate the operation, indoor supplementary heat exchanger heats the operation, liquid refrigerant gets into indoor main heat exchanger promptly, vaporize into gaseous state microthermal refrigerant, thereby absorb a large amount of heats, simultaneously, high temperature high pressure gaseous state refrigerant sends to indoor supplementary heat exchanger, form low temperature high pressure liquid refrigerant, dispel the heat through indoor supplementary heat exchanger, the heat of effluvium.
Wherein the measured parameters include an inlet temperature of the indoor main heat exchanger, an outlet temperature of the indoor main heat exchanger, a discharge temperature of the compressor, and an outdoor ambient temperature. Specifically, as shown in fig. 2, the inlet temperature T2A of the indoor main heat exchanger may be detected by the temperature sensor 4 disposed at the inlet of the indoor main heat exchanger (i.e., the first end of the indoor main heat exchanger 201 in fig. 2), the outlet temperature T2B of the indoor main heat exchanger may be detected by the temperature sensor 1 disposed at the outlet of the indoor main heat exchanger (i.e., the second end of the indoor main heat exchanger 201 in fig. 2), the discharge temperature T5 of the compressor may be detected by the temperature sensor 2 disposed at the discharge port of the compressor, and the outdoor ambient temperature T4 may be detected by the temperature sensor 3 disposed at the outdoor heat exchanger 104.
According to one embodiment of the invention, acquiring the outlet superheat degree of the indoor main heat exchanger comprises the following steps: and calculating the outlet superheat degree of the indoor main heat exchanger according to the difference between the outlet temperature T2B and the inlet temperature T2A of the indoor main heat exchanger, wherein the outlet superheat degree SH of the indoor main heat exchanger is T2B-T2A.
According to one embodiment of the invention, the opening degree adjusting value is calculated according to the outlet superheat degree of the indoor main heat exchanger, and the method comprises the following steps:
after the compressor is started for a first preset time, acquiring the exhaust temperature of the compressor, and determining a target superheat degree according to the exhaust temperature of the compressor;
and calculating an opening degree adjusting value according to the difference between the outlet superheat degree of the indoor main heat exchanger and the target superheat degree.
As one example, the first preset time may be 5 minutes, and the third exhaust temperature may be 85 ℃.
Specifically, the opening degree adjustment value Δ EV may be calculated according to the following formula:
ΔEV＝ΔSH＝A*(e-e’)+B*(ΔT/T1C)*(e+e’)；
where e is SH-SHs, SHs is the target superheat degree, e' is the last e value, a is the first calculation coefficient, e values are different, a values are different, B is the second calculation coefficient, e values are different, B values are different, Δ T is the adjustment time, and T1C is the calculation constant, for example, 120 is taken.
When the number of the indoor units is one, if the acquired exhaust temperature is less than the third exhaust temperature, the exhaust temperature of the compressor is converted into the third exhaust temperature so as to determine the target superheat degree according to the third exhaust temperature.
That is, when one indoor unit is opened alone, when the exhaust temperature T5 detected by the outdoor unit is less than the third exhaust temperature, a virtual exhaust temperature value, that is, the third exhaust temperature is sent to the indoor unit, the indoor unit determines a target superheat degree according to the virtual exhaust temperature value, and calculates an opening degree adjustment value; and when the discharge temperature T5 detected by the outdoor unit is greater than or equal to the third discharge temperature, the discharge temperature T5 actually detected by the outdoor unit is sent to the indoor unit, the indoor unit determines a target superheat degree according to the discharge temperature T5 actually detected by the outdoor unit, and an opening adjusting value is calculated.
As an example, the indoor unit may determine the target degree of superheat SHS from the section in which the received discharge temperature T5 is located. For example, referring to fig. 3, when the exhaust temperature T5 is less than 65 ℃, the target superheat SHS is 3. When the exhaust temperature T5 rises to 65 ℃ or higher, the target superheat SHS is 2, and 5 ℃ is taken as the return difference temperature, that is, when the exhaust temperature T5 falls to less than 60 ℃, the target superheat SHS becomes 3. Similarly, when the exhaust temperature T5 rises to 75 ℃ or higher, the target superheat SHS is 1, and 5 ℃ is taken as the return difference temperature, that is, when the exhaust temperature T5 falls to less than 70 ℃, the target superheat SHS becomes 2. When the exhaust temperature T5 rises to 85 ℃ or higher, the target superheat SHS is 1, and 5 ℃ is taken as the return difference temperature, that is, when the exhaust temperature T5 falls to less than 80 ℃, the target superheat SHS is 1. When the exhaust temperature T5 rises to 95 ℃ or higher, the target degree of superheat SHS is 0, and 5 ℃ is taken as the return difference temperature, that is, when the exhaust temperature T5 falls to less than 90 ℃, the target degree of superheat SHS becomes 1.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes:
when the number of the started indoor units is one, acquiring the exhaust temperature of the compressor after the compressor is started for a second preset time;
when the exhaust temperature of the compressor is greater than or equal to the first exhaust temperature, controlling the indoor unit to exit superheat degree control;
after the indoor unit exits superheat degree control, the opening degree of the throttling part of the indoor main heat exchanger is controlled to be increased until the exhaust temperature of the compressor is lower than a fourth exhaust temperature, the opening degree of the throttling part of the indoor main heat exchanger is kept unchanged, and the indoor unit is controlled to enter superheat degree control when the exhaust temperature of the compressor is lower than a second exhaust temperature.
As an example, the second preset time is less than the first preset time, for example, the second preset time may be 3 minutes, the first exhaust temperature is 95 ℃, the fourth exhaust temperature is 90 ℃, and the second exhaust temperature is 86 ℃.
Specifically, when the exhaust temperature T5 of the compressor is detected to be equal to or higher than the first exhaust temperature 3 minutes after the compressor is started by opening one indoor unit alone, the indoor unit exits superheat degree control, and enters control in which the opening degree of the throttle member of the indoor main heat exchanger is controlled to be increased on the basis of the current opening degree, for example, to be increased by 24P/min, that is, to be increased by 24 steps per minute.
In the process of controlling the opening degree of the throttling part to increase, the exhaust temperature T5 of the compressor is also detected in real time, and when the exhaust temperature T5 of the compressor is less than 90 ℃, the current opening degree of the throttling part of the indoor main heat exchanger is kept unchanged. Then, when the discharge temperature T5 of the compressor is less than 86 ℃, the superheat degree control of the indoor unit is resumed, that is, the superheat degree control is directly performed on the current opening degree.
In the process of controlling the degree of superheat of the indoor unit, the opening degree of the throttle member of the indoor main heat exchanger may be controlled according to the degree of superheat at the outlet of the indoor main heat exchanger. As an example, the opening degree of the throttling part of the indoor main heat exchanger may be adjusted in a proportional-integral control manner every 10 seconds.
S2: and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions and the opening adjustment value is greater than or equal to zero, acquiring the supercooling degree of the outdoor unit, and controlling the opening of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: and determining that the measurement parameters of the multi-split air conditioning system meet the preset entering conditions and the opening degree adjusting value is less than zero, and controlling the opening degree of the throttling component of the indoor main heat exchanger in a first mode according to the calculated opening degree adjusting value (obtained by calculation in step S1).
According to an embodiment of the present invention, when the multi-split system operates in the cooling mode, the preset entry condition includes: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to a third temperature threshold; when the multi-split system operates in the dehumidification reheating mode, the preset entry conditions include: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to the fourth temperature threshold.
As one example, the first temperature threshold may be a negative value, such as-3 ℃, the second temperature threshold may be 90 ℃, the third temperature threshold may be 15 ℃, and the fourth temperature threshold may be 10 ℃.
It can be understood that the indoor unit enters the supercooling degree control when the following conditions are all satisfied:
1) the indoor unit is in a refrigeration mode or a dehumidification reheating mode;
2) the indoor unit is in superheat degree control;
3) the inlet temperature T2A of the indoor main heat exchanger is more than or equal to-3 ℃;
4) the temperature of T5 is less than 90 ℃;
5) the refrigeration mode T4 is more than or equal to 15 ℃; alternatively, the dehumidification reheat mode T4>10 ℃;
after entering the supercooling degree control, firstly, whether the opening degree adjusting value calculated in the step S1 is greater than or equal to zero is judged, if the opening degree adjusting value is greater than or equal to zero, the supercooling degree of the outdoor unit is obtained, and the opening degree of the throttling component of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit. And if the opening degree adjusting value is smaller than zero, controlling the opening degree of the throttling part of the indoor main heat exchanger in a first mode according to the calculated opening degree adjusting value.
Therefore, the refrigerant before entering the throttling component of the indoor unit is in a supercooled state, the abnormal operation sound is effectively reduced, and the user experience is improved.
Specifically, according to an embodiment of the present invention, the obtaining of the supercooling degree of the outdoor unit includes:
acquiring the inlet temperature and the outlet temperature of a first pipeline in the intermediate heat exchanger;
and calculating the supercooling degree of the outdoor unit according to the inlet temperature and the outlet temperature of the first pipeline in the intermediate heat exchanger.
Note that, as shown in fig. 2, the inlet temperature T6A of the first line in the intermediate heat exchanger may be detected by a temperature sensor 5 provided at the inlet of the first line in the intermediate heat exchanger; the outlet temperature T6B of the first line in the intermediate heat exchanger can be detected by a temperature sensor 6 provided at the outlet of the first line in the intermediate heat exchanger. Specifically, the degree of supercooling Cd of the outdoor unit is T6A to T6B.
According to one embodiment of the present invention, the opening degree of the throttling part of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit:
acquiring outdoor environment temperature and acquiring the load rate of the multi-split system;
determining a comparison threshold according to the outdoor environment temperature and the load rate;
and controlling the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit and the comparison threshold value.
It should be noted that the load rate of the multi-split air-conditioning system may refer to the current load of the multi-split air-conditioning system and the rated total load of the multi-split air-conditioning system, where the rated total load is obtained through an outdoor unit nameplate.
That is, the comparison threshold Tx1 may be determined according to the outdoor ambient temperature and the load factor. As one example, the comparison threshold Tx1 may be determined according to table 1 below.
TABLE 1
Figure BDA0002230856760000091
As can be seen from table 1, when the outdoor ambient temperature T4 is greater than 15 ℃ and equal to or less than 35 ℃, and the load factor is greater than 0 and equal to or less than 60%, the comparison threshold Tx1 is 10; when the outdoor environment temperature T4 is greater than 15 ℃ and less than or equal to 35 ℃, and the load factor is greater than 60% and less than or equal to 100%, the comparison threshold Tx1 is 8; when the outdoor environment temperature T4 is greater than 35 ℃ and less than or equal to 45 ℃ and the load factor is greater than 0 and less than or equal to 60%, the comparison threshold Tx1 is 9; when the outdoor environment temperature T4 is greater than 35 ℃ and less than or equal to 45 ℃, and the load factor is greater than 60% and less than or equal to 100%, the comparison threshold Tx1 is 7; when the outdoor environment temperature T4 is higher than 45 ℃ and the load factor is higher than 0 and less than or equal to 60%, the comparison threshold Tx1 is 5; when the outdoor ambient temperature T4 is greater than 45 ℃ and the load factor is greater than 60% and equal to or less than 100%, the comparison threshold Tx1 is 4.
Specifically, the method for controlling the opening degree of the throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit and the comparison threshold value comprises the following steps:
determining a first comparison threshold and a second comparison threshold according to the comparison threshold;
when the supercooling degree of the outdoor unit is in an ascending trend and the supercooling degree of the outdoor unit is greater than or equal to a first comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and the supercooling degree of the outdoor unit is greater than or equal to the difference between the first comparison threshold value and a return difference value, controlling the opening of a throttling component of the indoor main heat exchanger in a first mode according to the opening adjusting value obtained through calculation;
when the supercooling degree of the outdoor unit is in an ascending trend and is more than or equal to a second comparison threshold and less than a first comparison threshold, or the supercooling degree of the outdoor unit is in a descending trend and is more than or equal to the difference between the second comparison threshold and the return difference value and less than the difference between the first comparison threshold and the return difference value, controlling the opening of the throttling component of the indoor main heat exchanger in a second mode according to the opening adjusting value obtained by calculation;
and when the supercooling degree of the outdoor unit is in an ascending trend and is smaller than the second comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and is smaller than the difference between the second comparison threshold value and the return difference value, keeping the opening degree of the throttling component of the indoor main heat exchanger unchanged.
As an example, the first comparison threshold may be the sum of the comparison threshold Tx1 and the third threshold, and the second comparison threshold may be the comparison threshold Tx 1. The third threshold may be 5 and the return difference may be 1.
Specifically, as shown in fig. 4, a comparison threshold Tx1 may be determined according to the outdoor ambient temperature and the load factor, that is, a supercooling degree interval is determined, and then a corresponding control manner, that is, a first manner, a second manner, and a third manner, may be determined according to an interval in which the supercooling degree Cd of the outdoor unit is located. For example, referring to fig. 4, when the supercooling degree Cd of the outdoor unit (T6A-T6B) is less than Tx1, the third method is selected; when the supercooling degree Cd (T6A-T6B) of the outdoor unit rises to be more than or equal to Tx1, selecting the second mode, and taking 1 as a return difference value, namely when the supercooling degree Cd (T6A-T6B) of the outdoor unit falls to be less than Tx1-1, selecting the third mode; when the supercooling degree Cd (T6A-T6B) of the outdoor unit rises to be more than or equal to Tx1+5, selecting the first mode, and taking 1 as a return difference value, namely when the supercooling degree Cd (T6A-T6B) of the outdoor unit falls to be less than Tx1+5-1, selecting the second mode.
The first mode, in which the opening degree of the throttle member of the indoor main heat exchanger is controlled in the first mode, includes:
comparing the absolute value of the calculated opening degree regulating value with a first opening degree range;
if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of a first opening degree range and smaller than the upper limit value of the first opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the first opening degree range is a first opening degree value, and the upper limit value of the first opening degree range is the minimum value of the product of the current opening degree value of the throttling part of the indoor main heat exchanger and a first threshold value and a second opening degree value;
if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the first opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the lower limit value of the first opening degree range;
and if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the first opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the upper limit value of the first opening degree range.
That is, in the first embodiment, P1 ≦ Δ EV ≦ min (a × EV ', P2), where Δ EV is the opening degree adjustment value calculated in step S1, and may be a positive number or a negative number, P1 may be 1 step, i.e., 1pls, P2 may be 24 steps, i.e., 24pls, a may be a constant, e.g., 0.1, EV' is the current opening degree of the throttle member, and min (a × EV ', P2) refers to the minimum value between a × EV' and P2.
In the first mode, the opening degree adjustment value of the throttling component of the indoor main heat exchanger needs to satisfy that P1 ≦ Δ EV ≦ min (a × EV ', P2), and if the opening degree adjustment value Δ EV calculated in step S1 satisfies that P1 ≦ Δ EV ≦ min (a × EV ', P2), the opening degree of the throttling component of the indoor main heat exchanger is determined by adding the calculated opening degree adjustment value Δ EV to the current opening degree, that is, EV ≦ EV ' + Δ EV.
It can be understood that if Δ EV calculated in step S1 is a negative value, the opening degree of the throttling component of the main heat exchanger in the small chamber needs to be closed next, that is, EV' - | Δ EV |; if Δ EV calculated in step S1 is a positive value, the opening degree of the throttling component of the indoor main heat exchanger needs to be increased, i.e., EV' + | Δ EV |.
In the second aspect, the controlling the opening degree of the throttle member of the indoor main heat exchanger in the second aspect includes:
comparing the absolute value of the calculated opening degree regulating value with a second opening degree range;
if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of a second opening degree range and smaller than the upper limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the second opening degree range is a first opening degree value, and the upper limit value of the second opening degree range is the minimum value of the product of the current opening degree value of the throttling part of the indoor main heat exchanger and a second threshold value and the second opening degree value;
if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the lower limit value of the second opening degree range;
and if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger by using the upper limit value of the second opening degree range.
That is, in the second embodiment, P1 ≦ Δ EV ≦ min (b ≦ EV ', P2), where Δ EV is the opening degree adjustment value calculated in step S1, and may be a positive number or a negative number, P1 may be 1 step, i.e., 1pls, P2 may be 24 steps, i.e., 24pls, b may be a constant, e.g., 0.05, EV' is the current opening degree of the throttle member, and min (b ≦ EV ', P2) refers to the minimum value between b ≦ EV' and P2.
In the second mode, the opening degree adjustment value of the throttling component of the indoor main heat exchanger needs to satisfy that P1 ≦ Δ EV ≦ min (b × EV ', P2), and if the opening degree adjustment value Δ EV calculated in step S1 satisfies that P1 ≦ Δ EV ≦ min (b × EV ', P2), the opening degree of the throttling component of the indoor main heat exchanger is determined by adding the calculated opening degree adjustment value Δ EV to the current opening degree, that is, EV ≦ EV ' + Δ EV.
It can be understood that, in the second mode, Δ EV calculated in step S1 is a positive value, and thus, the opening degree of the throttling member of the indoor main heat exchanger needs to be increased, that is, EV' + | Δ EV |.
In the third embodiment, 0pls ≦ Δ EV | ≦ min (0 × EV, 24pls), i.e., Δ EV is zero, and the opening degree of the throttling member of the indoor main heat exchanger is kept constant.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes:
and the multi-split air-conditioning system exits from the refrigeration mode or the dehumidification and reheating mode, or the indoor unit exits from superheat degree control, or the opening degree of the throttling component of the indoor main heat exchanger is stopped being controlled according to the supercooling degree of the outdoor unit when the measured parameter meets the preset exit condition.
Wherein the preset exit condition comprises:
the inlet temperature of the indoor main heat exchanger is less than a first temperature threshold; or the discharge temperature of the compressor is greater than or equal to the second temperature threshold.
In addition, when the multi-split air conditioner system performs oil return operation, the control of the opening degree of the throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit is stopped.
That is, if the multi-split air conditioning system exits the cooling mode or the dehumidification reheating mode, or the indoor unit exits the superheat degree control, or the measured parameter meets the preset exit condition, or the multi-split air conditioning system performs the oil return operation, the subcooling degree control exits.
Specifically, the supercooling degree control is exited when any one of the following conditions is satisfied:
1) the indoor unit exits from a refrigeration mode or a dehumidification reheating mode;
2) the indoor unit quits superheat degree control;
3) the inlet temperature T2A of the indoor main heat exchanger is less than-3 ℃;
4) the discharge temperature T5 of the compressor is more than or equal to 90 ℃;
5) and performing oil return operation on the multi-split air conditioning system.
As described above, according to the embodiment of fig. 5, the method for controlling a multi-split system according to an embodiment of the present invention includes the following steps:
s101: whether the number of the indoor units is larger than 1.
If yes, executing step S102; if not, step S105 is performed.
S102: it is judged whether or not the discharge temperature T5 of the compressor is 95 ℃ or higher 3 minutes after the compressor is started.
If yes, executing step S103; if not, step S104 is executed.
S103: and the indoor unit quits superheat degree control, the opening degree of the throttling part of the indoor main heat exchanger is controlled to be increased by 24P/min on the basis of the current opening degree, when the exhaust temperature T5 of the compressor is less than 90 ℃, the current opening degree of the throttling part of the indoor main heat exchanger is kept unchanged, and when the exhaust temperature T5 of the compressor is less than 86 ℃, the superheat degree control of the indoor unit is recovered, namely the superheat degree control is directly carried out on the current opening degree.
S104: if the discharge temperature T5 is greater than or equal to 85 ℃, the indoor unit determines a target superheat degree SHS according to the actually detected discharge temperature T5 of the outdoor unit, if the discharge temperature T5 is greater than or equal to 85 ℃, the indoor unit determines the target superheat degree SHS according to the virtual discharge temperature 85 ℃, and step S106 is executed.
S105: the indoor unit determines a target superheat SHS from the discharge temperature T5 actually detected by the outdoor unit.
S106: and acquiring an outlet superheat SH of the indoor main heat exchanger, and calculating a difference e between the outlet superheat of the indoor main heat exchanger and the target superheat, namely SH-SHS.
S107: and calculating an opening degree adjusting value delta EV according to the outlet superheat degree of the indoor main heat exchanger.
S108: judging whether the following adjustments all meet 1) that the indoor unit is in a refrigeration mode or a dehumidification and reheating mode; 2) the indoor unit is in superheat degree control; 3) the inlet temperature T2A of the indoor main heat exchanger is more than or equal to-3 ℃; 4) the temperature of T5 is less than 90 ℃; 5) the refrigeration mode T4 is more than or equal to 15 ℃; alternatively, the dehumidification reheat mode T4>10 ℃.
If yes, go to step S110; if not, step S109 is performed.
S109: and controlling the opening degree of a throttling part of the indoor main heat exchanger according to the superheat degree SH of the outlet of the indoor main heat exchanger.
S110: it is determined whether or not the calculated opening degree adjustment value Δ EV is equal to or greater than 0.
If so, go to step S113; if not, step S111 is performed.
S111: when Δ EV is negative, i.e., the next step needs to be smaller, 1pls ≦ Δ EV | ≦ min (0.1 × EV, 24 pls).
S112：EV＝EV’+ΔEV。
S113: the comparison threshold Tx1 is determined according to the outdoor ambient temperature T4 and the load factor.
S114: and calculating the supercooling degree Cd of the outdoor unit as T6A-T6B.
S115: when Δ EV is a positive value, i.e., when the next step needs to be increased, the following control is performed: if Cd is greater than or equal to Tx1+5, 1pls ≦ | Δ EV | ≦ min (0.1 × EV, 24 pls); if Cd is greater than or equal to Tx1 and less than Tx1+5, then 1pls ≦ | Δ EV | ≦ min (0.05 × EV, 24 pls); if Cd is less than Tx1, 0pls ≦ Δ EV | ≦ min (0 × EV, 24pls), i.e., remain unchanged.
S116：EV＝EV’+ΔEV。
S117: judging whether any one of the following conditions is met, 1) the indoor unit exits from a refrigeration mode or a dehumidification reheating mode; 2) the indoor unit quits superheat degree control; 3) the inlet temperature T2A of the indoor main heat exchanger is less than-3 ℃; 4) the discharge temperature T5 of the compressor is more than or equal to 90 ℃; 5) and performing oil return operation on the multi-split air conditioning system.
If so, go to step S118; if not, step S101 is executed.
S118: and (4) quitting the supercooling degree control, and controlling the opening degree of the throttling part of the indoor main heat exchanger according to the outlet superheat degree SH of the indoor main heat exchanger.
According to the control method of the multi-split system provided by the embodiment of the invention, when the measurement parameters of the multi-split system meet the preset entry conditions and the opening adjustment value is greater than or equal to zero, the opening of the throttling component of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit, so that the refrigerant before entering the throttling component of the indoor unit is in a supercooling state, the abnormal operation sound is effectively reduced, and the user experience is improved.
In order to realize the embodiment, the invention further provides a multi-split system.
Fig. 6 is a block schematic diagram of a multi-split system according to an embodiment of the present invention. As shown in fig. 6, the multi-split system includes: the outdoor unit 100, a plurality of indoor units 200, and a control module 300.
Wherein the outdoor unit 100 includes a compressor, an outdoor heat exchanger, and an intermediate heat exchanger; each indoor unit 200 includes an indoor main heat exchanger and an indoor auxiliary heat exchanger; the control module 300 is configured to, when the multi-split air conditioning system operates in the cooling mode or the dehumidification and reheating mode and the indoor unit is in superheat degree control, obtain a measurement parameter of the multi-split air conditioning system, obtain an outlet superheat degree of the indoor main heat exchanger, calculate an opening degree adjustment value according to the outlet superheat degree of the indoor main heat exchanger, determine that the measurement parameter of the multi-split air conditioning system meets a preset entry condition, and the opening degree adjustment value is greater than or equal to zero, obtain a supercooling degree of the outdoor unit, and control the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit.
It should be noted that the foregoing explanation of the embodiment of the control method of the multi-split system is also applicable to the multi-split system of the embodiment, and is not repeated here.
According to the multi-split system provided by the embodiment of the invention, when the measurement parameters of the multi-split system meet the preset entry conditions and the opening adjustment value is greater than or equal to zero, the opening of the throttling component of the indoor main heat exchanger is controlled according to the supercooling degree of the outdoor unit, so that the refrigerant before entering the throttling component of the indoor unit is in a supercooling state, the abnormal operation sound is effectively reduced, and the user experience is improved.
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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. The control method of the multi-split system is characterized in that the multi-split system comprises an outdoor unit and a plurality of indoor units, the outdoor unit comprises a compressor, an outdoor heat exchanger and an intermediate heat exchanger, each indoor unit comprises an indoor main heat exchanger and an indoor auxiliary heat exchanger, and the method comprises the following steps:
when the multi-split air conditioner system runs in a refrigeration mode or a dehumidification and reheating mode and the indoor unit is in superheat degree control, acquiring measurement parameters of the multi-split air conditioner system, acquiring outlet superheat degree of the indoor main heat exchanger, and calculating an opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger;
and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions, and the opening adjusting value is greater than or equal to zero, acquiring the supercooling degree of the outdoor unit, and controlling the opening of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit.
2. The method of controlling a multi-split system as claimed in claim 1, wherein the measured parameters include an inlet temperature of an indoor main heat exchanger, a discharge temperature of the compressor, and the outdoor ambient temperature.
3. The control method of a multi-split system as set forth in claim 2,
when the multi-split air conditioning system operates in a cooling mode, the preset entry condition comprises the following steps: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to a third temperature threshold;
when the multi-split air conditioning system operates in a dehumidification and reheat mode, the preset entry conditions comprise: the inlet temperature of the indoor main heat exchanger is greater than or equal to a first temperature threshold value; and the discharge temperature of the compressor is less than a second temperature threshold; and the outdoor environment temperature is greater than or equal to a fourth temperature threshold.
4. The method of controlling a multi-split system as claimed in claim 1, wherein the obtaining of the supercooling degree of the outdoor unit comprises:
acquiring the inlet temperature and the outlet temperature of a first pipeline in the intermediate heat exchanger;
and calculating the supercooling degree of the outdoor unit according to the inlet temperature and the outlet temperature of the first pipeline in the intermediate heat exchanger.
5. The method of controlling a multi-split system as claimed in claim 1, wherein the opening degree of a throttling part of the indoor main heat exchanger is controlled according to a supercooling degree of the outdoor unit:
acquiring the outdoor environment temperature and acquiring the load rate of the multi-split system;
determining a comparison threshold according to the outdoor environment temperature and the load factor;
and controlling the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit and the comparison threshold value.
6. The method for controlling a multi-split system as claimed in claim 5, wherein the controlling of the opening degree of a throttling part of the indoor main heat exchanger according to the degree of supercooling of the outdoor unit and the comparison threshold comprises:
determining a first comparison threshold and a second comparison threshold according to the comparison threshold;
when the supercooling degree of the outdoor unit is in an ascending trend and the supercooling degree of the outdoor unit is greater than or equal to the first comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and the supercooling degree of the outdoor unit is greater than or equal to the difference between the first comparison threshold value and the return difference value, controlling the opening of the throttling component of the indoor main heat exchanger in a first mode according to the opening adjusting value obtained through calculation;
when the supercooling degree of the outdoor unit is in an ascending trend and is more than or equal to the second comparison threshold and less than the first comparison threshold, or the supercooling degree of the outdoor unit is in a descending trend and is more than or equal to the difference between the second comparison threshold and the return difference value and less than the difference between the first comparison threshold and the return difference value, controlling the opening of the throttling component of the indoor main heat exchanger in a second mode according to the calculated opening adjusting value;
and when the supercooling degree of the outdoor unit is in an ascending trend and is smaller than the second comparison threshold value, or the supercooling degree of the outdoor unit is in a descending trend and is smaller than the difference between the second comparison threshold value and the return difference value, keeping the opening degree of the throttling component of the indoor main heat exchanger unchanged.
7. The method of controlling a multi-split system as set forth in claim 6, further comprising:
and determining that the measurement parameters of the multi-split air conditioning system meet preset entry conditions and the opening adjustment value is less than zero, and controlling the opening of the throttling component of the indoor main heat exchanger in a first mode according to the calculated opening adjustment value.
8. The control method of a multi-split system as set forth in claim 6 or 7,
controlling an opening degree of a throttle member of the indoor main heat exchanger in a first manner includes:
comparing the absolute value of the calculated opening degree regulating value with a first opening degree range;
if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of the first opening degree range and smaller than the upper limit value of the first opening degree range, controlling the opening degree of the throttling component of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the first opening degree range is a first opening degree value, and the upper limit value of the first opening degree range is the minimum value of the product of the current opening degree value of the throttling component of the indoor main heat exchanger and a first threshold value and a second opening degree value;
if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the first opening degree range, controlling the opening degree of a throttling part of the indoor main heat exchanger by using the lower limit value of the first opening degree range;
if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the first opening degree range, controlling the opening degree of a throttling part of the indoor main heat exchanger by using the upper limit value of the first opening degree range;
the controlling the opening degree of the throttle member of the indoor main heat exchanger in the second manner includes:
comparing the absolute value of the calculated opening degree regulating value with a second opening degree range;
if the absolute value of the calculated opening degree adjusting value is larger than the lower limit value of the second opening degree range and smaller than the upper limit value of the second opening degree range, controlling the opening degree of the throttling component of the indoor main heat exchanger by using the absolute value of the calculated opening degree adjusting value, wherein the lower limit value of the second opening degree range is a first opening degree value, and the upper limit value of the second opening degree range is the minimum value of the product of the current opening degree value of the throttling component of the indoor main heat exchanger and a second threshold value and a second opening degree value;
if the absolute value of the calculated opening degree adjusting value is smaller than or equal to the lower limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger according to the lower limit value of the second opening degree range;
and if the absolute value of the calculated opening degree adjusting value is larger than or equal to the upper limit value of the second opening degree range, controlling the opening degree of the throttling part of the indoor main heat exchanger according to the upper limit value of the second opening degree range.
9. The method of controlling a multi-split system as set forth in claim 2, further comprising:
and the multi-split air-conditioning system exits from the refrigeration mode or the dehumidification and reheating mode to operate, or the indoor unit exits from superheat degree control, or the opening degree of a throttling component of the indoor main heat exchanger is stopped to be controlled according to the supercooling degree of the outdoor unit when the measured parameter meets a preset exit condition.
10. The method of controlling a multi-split system as claimed in claim 9, wherein the preset exit condition includes:
the inlet temperature of the indoor main heat exchanger is less than a first temperature threshold; or the discharge temperature of the compressor is greater than or equal to a second temperature threshold.
11. The control method of a multi-split system as claimed in claim 1, wherein the calculating an opening degree adjustment value according to an outlet superheat degree of the indoor main heat exchanger includes:
after the compressor is started for a first preset time, acquiring the exhaust temperature of the compressor, and determining a target superheat degree according to the exhaust temperature of the compressor;
and calculating the opening degree adjusting value according to the difference between the outlet superheat degree of the indoor main heat exchanger and the target superheat degree.
12. The control method of a multi-split system as claimed in claim 11, wherein when the number of the indoor units being opened is one, if the acquired discharge temperature is less than a third discharge temperature, the discharge temperature of the compressor is converted into the third discharge temperature so as to determine a target superheat degree from the third discharge temperature.
13. The method of controlling a multi-split system as set forth in claim 1, further comprising:
when the number of the started indoor units is one, acquiring the exhaust temperature of the compressor after the compressor is started for a second preset time;
when the exhaust temperature of the compressor is greater than or equal to a first exhaust temperature, controlling the indoor unit to exit superheat degree control;
and after the indoor unit exits superheat degree control, controlling the opening degree of the throttling part of the indoor main heat exchanger to be increased until the exhaust temperature of the compressor is lower than a fourth exhaust temperature, keeping the opening degree of the throttling part of the indoor main heat exchanger unchanged, and controlling the indoor unit to enter superheat degree control when the exhaust temperature of the compressor is lower than a second exhaust temperature.
14. A multiple on-line system, comprising:
an outdoor unit including a compressor, an outdoor heat exchanger, and an intermediate heat exchanger;
the indoor units comprise an indoor main heat exchanger and an indoor auxiliary heat exchanger;
the control module is used for acquiring measurement parameters of the multi-split air conditioner system, acquiring the outlet superheat degree of the indoor main heat exchanger, calculating an opening degree adjusting value according to the outlet superheat degree of the indoor main heat exchanger when the multi-split air conditioner system runs in a refrigeration mode or a dehumidification and reheating mode and the indoor unit is in superheat degree control, and acquiring the supercooling degree of the outdoor unit and controlling the opening degree of a throttling component of the indoor main heat exchanger according to the supercooling degree of the outdoor unit when the measurement parameters of the multi-split air conditioner system meet preset entering conditions and the opening degree adjusting value is larger than or equal to zero.
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