CN112303807A - Compressor loading control method, multi-split system and storage medium - Google Patents

Compressor loading control method, multi-split system and storage medium Download PDF

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Publication number
CN112303807A
CN112303807A CN202011169028.XA CN202011169028A CN112303807A CN 112303807 A CN112303807 A CN 112303807A CN 202011169028 A CN202011169028 A CN 202011169028A CN 112303807 A CN112303807 A CN 112303807A
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China
Prior art keywords
water temperature
compressor
change rate
compressors
loading
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CN202011169028.XA
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Chinese (zh)
Inventor
周飞
温得贤
杨瑞
姚鸿海
宋培刚
孙常权
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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Priority to CN202011169028.XA priority Critical patent/CN112303807A/en
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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
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a compressor loading control method, which is used for a multi-split system, wherein the multi-split system comprises at least 2 compressors, and the control method comprises the following steps: acquiring a system water temperature change rate and a first preset water temperature change rate of the multi-split system; and adjusting the loading number of the compressors according to the water temperature change rate of the system and the first preset water temperature change rate. The invention also discloses a multi-online system and a storage medium. By adopting the compressor loading control method, the temperature requirement of a room can be responded in time by the compressor loading control.

Description

Compressor loading control method, multi-split system and storage medium
Technical Field
The invention relates to the field of air conditioner control, in particular to a compressor loading control method, a multi-split system and a storage medium.
Background
The multi-split air conditioning system is generally formed by connecting 2-4 water systems in parallel, and each water system is provided with a compressor. The loading of a compressor is regulated and controlled by setting the temperature difference between the water temperature and the water temperature of the inlet and outlet of the system in the existing multi-split system. However, due to the influence of factors such as the capacity of the system water and the conveying distance, the system water temperature in the water system has hysteresis corresponding to the room temperature, so that the compressor loading control mode based on the system water temperature cannot respond to the indoor temperature demand in time.
Disclosure of Invention
The invention mainly aims to provide a compressor loading control method, a multi-split system and a storage medium, and aims to solve the technical problem that the compressor loading control in the multi-split system cannot respond to the temperature requirement of a room in time.
In order to achieve the above object, the present invention provides a compressor loading control method for a multi-split system, wherein the multi-split system comprises at least 2 compressors, and the control method comprises the following steps:
acquiring a system water temperature change rate and a first preset water temperature change rate of the multi-split system;
and adjusting the loading number of the compressors according to the water temperature change rate of the system and the first preset water temperature change rate.
Optionally, before the step of adjusting the loading number of the compressor according to the system water temperature change rate and the first preset water temperature change rate, the control method further includes:
acquiring the system water temperature of the multi-split system;
judging whether the water temperature of the system is in a first temperature range or not;
the step of adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate comprises the following steps:
and if the system water temperature is within the first temperature range, adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate.
Optionally, the step of adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate includes:
judging whether the water temperature change rate of the system is less than or equal to a first preset water temperature change rate or not;
if the water temperature change rate of the system is less than or equal to a first preset water temperature change rate, loading at least one compressor from unloaded compressors;
and if the water temperature change rate of the system is greater than the first preset water temperature change rate, keeping the current loading number of the compressors.
Optionally, after the step of determining whether the system water temperature is within a first temperature range, the control method further includes:
if the system water temperature is not within the first temperature range, judging whether the system water temperature is within a second temperature range, wherein the multi-split system is provided with a refrigeration mode and a heating mode, and in the refrigeration mode, the maximum value of the second temperature range is smaller than the minimum value of the first temperature range; in the heating mode, a minimum value of the second temperature range is greater than a maximum value of the first temperature range;
and if the system water temperature is within the second temperature range, adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate.
Optionally, if the system water temperature is within the second temperature range, adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate, including:
if the system water temperature is in the second temperature range, acquiring a second preset water temperature change rate based on the first preset water temperature change rate, wherein the second preset water temperature change rate is smaller than or equal to the first preset water temperature change rate;
if the water temperature change rate of the system is less than or equal to a second preset water temperature change rate, loading at least one compressor from unloaded compressors;
if the water temperature change rate of the system is greater than a second preset water temperature change rate and less than a first preset water temperature change rate, keeping the current loading number of the compressors;
and if the change rate of the water temperature of the system is greater than or equal to the first preset water temperature change rate, unloading at least one compressor from the currently loaded compressors.
Optionally, if the system water temperature is not within the first temperature range, after determining whether the system water temperature is within a second temperature range, the control method further includes:
if the system water temperature is not in the second temperature range, judging whether the system water temperature is in a third temperature range, wherein in the refrigeration mode, the maximum value of the third temperature range is smaller than the minimum value of the second temperature range; in the heating mode, a minimum value of the third temperature range is greater than a maximum value of the second temperature range;
if the water temperature of the system meets the preset condition, the step of adjusting the loading quantity of the compressors according to the change rate of the water temperature of the system and the first preset water temperature change rate comprises the following steps:
and if the water temperature of the system is in a third temperature range, unloading at least one compressor from the currently loaded compressors.
Optionally, the step of unloading at least one compressor from the currently loaded compressors comprises:
the method comprises the steps of obtaining the running frequency of each currently loaded compressor, and obtaining a first frequency threshold value of the compressor;
determining a compressor to be selected with the running frequency lower than a first frequency threshold value according to the running frequency of each currently loaded compressor;
one compressor is unloaded from the candidate compressors.
Optionally, the step of loading at least one compressor from unloaded compressors comprises:
acquiring the running frequency of the currently loaded compressor and a second frequency threshold;
judging whether the running frequency of each currently loaded compressor is greater than or equal to a second frequency threshold value;
and if the running frequency of the currently loaded compressor is greater than or equal to the second frequency threshold value, loading the pre-loaded compressor.
In addition, in order to achieve the above object, the present invention further provides a multi-split system, including at least 2 compressors, a memory, a processor, and a compressor loading control program stored on the memory and executable on the processor, the compressor loading control program being configured to implement the steps of the compressor loading control method.
In addition, in order to achieve the above object, the present invention further provides a storage medium, in which a compressor loading control program is stored, and the steps of the foregoing compressor loading control method are implemented when the compressor loading control program is executed by a processor.
The embodiment of the invention provides a compressor loading control method, a multi-split system and a storage medium. The compressor loading control method controls the loading of the compressor through the system water temperature change rate of the multi-split system, so that the compressor loading control of the multi-split system can respond to the temperature requirement of a room in time.
Drawings
Fig. 1 is a schematic diagram of a multi-split system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a compressor load control method in accordance with an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a specific implementation of a first embodiment of a compressor load control method in an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a second embodiment of a compressor load control method in accordance with an embodiment of the present invention;
fig. 5 is a schematic flow chart of a third embodiment of a compressor loading control method according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Multiple on-line systems, such as conventional heat pump systems, typically consist of 2 to 4 water systems in parallel, each with a compressor. The existing multi-split air conditioning system only takes the temperature difference between the set water temperature of the system and the water temperature of the system (the system inlet water temperature or the system outlet water temperature) as the loading condition of the compressor, but is influenced by factors such as the system water capacity, the conveying distance and the like, the water temperature of the system in the water system has hysteresis corresponding to the room temperature, so that the loading control mode of the compressor based on the temperature difference of the water temperature of the system lags behind the temperature requirement of the air conditioning room, and the loading control mode of the compressor cannot timely respond to the temperature requirement of the air conditioning room.
To address this problem, various embodiments of the compressor loading control method of the present invention are presented. The compressor loading control method controls the loading of the compressor through the system water temperature change rate of the multi-split system, so that the compressor loading control of the multi-split system can respond to the temperature requirement of a room in time.
Referring to fig. 1, fig. 1 is a schematic diagram of a recommended structure of a multi-split system according to an embodiment of the present invention.
The multiple split air-conditioning system comprises at least 2 compressors, a processor 301, a memory 302 and a compressor loading control program stored on the memory and operable on the processor, the compressor loading control program being configured to implement the steps of the compressor loading control method as before.
The processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 301 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 301 may also include a main processor and a coprocessor, where the main processor is a processor for processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. The processor 301 may further include an AI (Artificial Intelligence) processor for processing related compressor load control operations such that the compressor load control model may be trained autonomously to improve efficiency and accuracy.
Memory 302 may include one or more computer-readable storage media, which may be non-transitory. Memory 302 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in the memory 302 is used to store at least one instruction for execution by the processor 801 to implement the compressor loading control method provided by the method embodiments herein.
In some embodiments, the terminal may further include: a communication interface 303 and at least one peripheral device. The processor 301, the memory 302 and the communication interface 303 may be connected by a bus or signal lines. Various peripheral devices may be connected to communication interface 303 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304 and power supply 305.
The communication interface 303 may be used to connect at least one peripheral device related to I/O (Input/Output) to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and communication interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302 and the communication interface 303 may be implemented on a single chip or circuit board, which is not limited in this embodiment.
The Radio Frequency circuit 304 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 304 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 304 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 comprises: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the rf circuit 304 may further include NFC (Near Field Communication) related circuits, which are not limited in this application.
The power supply 305 is used to supply power to the processor 301 and various components in the memory 302. The power source 305 may be alternating current, direct current, disposable or rechargeable. When power source 305 comprises a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.
Those skilled in the art will appreciate that the configuration shown in fig. 1 is not intended to be limiting of a multiple inline system and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
An embodiment of the present invention provides a method for controlling a loading of a compressor, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for controlling a loading of a compressor according to the present invention.
In this embodiment, the compressor loading control method is used in a multi-split system, the multi-split system includes at least 2 compressors, and the control method includes the following steps:
step S101, acquiring a system water temperature change rate and a first preset water temperature change rate of the multi-split system.
Specifically, the system water temperature may be an average inlet water temperature or an average outlet water temperature of the multi-split system. After the multi-split system is started, the inlet water temperature and the outlet water temperature of each water system can be obtained, and then the water temperature of the system is calculated. Specifically, the average value of the plurality of inlet water temperatures or the maximum value or the minimum value of the outlet water temperatures obtained by the plurality of water systems can be removed, so that the average inlet water temperature or the average outlet water temperature of the multi-split system can be calculated. Because the inlet water temperature and the outlet water temperature of each water system can be monitored in real time, the water temperature of the system can be calculated according to the actually monitored inlet water temperature or outlet water temperature. The change rate of the water temperature of the system is the change value of the water temperature of the system in unit time, and the water temperature of the system can be calculated in real time, so that the change rate of the water temperature of the system can be calculated according to the difference value of the water temperature of the system in unit time. In the cooling mode, the change rate of the water temperature of the system is the temperature drop rate of the water temperature of the system, and in the heating mode, the change rate of the water temperature of the system is the temperature rise rate of the water temperature of the system. First preset water temperature change rate D1Is a rate constant.
The average water inlet temperature will be specifically described below as an example. It is easy to understand that the system water temperature can also be the average outlet water temperature, and the description is omitted here.
And S102, adjusting the loading number of the compressors according to the change rate of the water temperature of the system and the first preset water temperature change rate.
Specifically, in the above steps, the loaded number of the compressors is adjusted according to the system water temperature change rate of the system, and the adjustment may be to unload the compressors from the loaded compressors, or to load the compressors from the compressors that are not loaded in the multi-split system, or to maintain the current loaded number of the compressors, that is, neither to load nor unload the compressors.
In the embodiment, the loading quantity of the compressors is adjusted according to the system water temperature change rate of the multi-split system, so that the loading control of the compressors of the multi-split system can respond to the temperature requirement of a room in time, and the comfort of the multi-split system is improved. Meanwhile, the factor of the water temperature change speed reflected by the water temperature change rate of the system is considered in the control process of the compressor, the loading control of the compressor is coordinated, the response time of the water temperature of the system in the system is fully given, and the fluctuation of the water temperature of the system and the room temperature is avoided, so that the comfort of the multi-split system is further improved.
Based on the first embodiment of the present invention, a second embodiment of the compressor loading control method of the present invention is proposed. Referring to fig. 3, fig. 3 is a flow chart illustrating a compressor loading control method according to the present embodiment.
The compressor loading control method is applied to the operation in a refrigeration mode after the multi-split system is started to operate. Specifically, the compressor loading control method comprises the following steps:
step S201, acquiring system water temperature and system water temperature change rate delta T of the multi-split systemtAnd a first preset water temperature change rate D1。
In this embodiment, the system water temperature may be an average inlet water temperature.
Step S202, judging whether the system water temperature is in a first temperature range.
For example, the first temperature range is Tin≥TC+ A, wherein, TinIs the average inlet water temperature, TCThe set water temperature of the multi-split system is A, and the constant value of the water temperature deviation is A.
Step S203, if the system water temperature is in the first temperature range, determining the change rate Delta T of the system water temperaturetWhether the water temperature is less than or equal to a first preset water temperature change rate D1。
Specifically, this step is for determining Δ Tt≤D1Whether or not this is true.
And S204, unloading at least one compressor from the currently loaded compressors if the change rate of the water temperature of the system is less than or equal to a first preset water temperature change rate.
Specifically, if ΔTt≤D1If so, one compressor is loaded from the unloaded compressors. For example, the time T can be spacedm1A compressor is loaded. T ism1Is the interval time between two loading actions.
It is easy to understand that two or more compressors can be loaded from unloaded compressors, so that the water temperature of the system can respond to the requirement of a user more quickly, and the frequent loading and unloading of the unit can be prevented, and the reliability of the compressors and the electric control is influenced. In order to maintain the stability of the water temperature of the system and avoid the great fluctuation of the water temperature of the multi-split system, one compressor is preferably loaded each time.
And S205, if the change rate of the water temperature of the system is greater than the first preset water temperature change rate, keeping the current loading number of the compressors.
Specifically, if Δ Tt＞D1Then the current loaded number of compressors is maintained.
And S206, if the water temperature of the system is not in the first temperature range, keeping the current loading quantity of the compressors.
Specifically, if Tin＜TC+ A, the current loaded number of compressors is maintained.
In the embodiment, on the basis of conventional system water temperature control, the loading quantity of the compressors is adjusted by combining the system water temperature change rate of the multi-online system, so that the loading control of the compressors of the multi-online system is more accurate, the efficiency of equipment is improved, the temperature requirement of a room can be responded timely, and the comfort of the multi-online system is improved.
A third embodiment of the compressor load control method of the present invention is presented based on the first and second embodiments of the compressor load control method of the present invention.
In this embodiment, the control method includes:
step S301, acquiring the system water temperature, the system water temperature change rate and a first preset water temperature change rate of the multi-split system.
Step S302, judging whether the system water temperature is in a first temperature range.
For exampleThe first temperature range is Tin≥TC+ A, wherein, TinIs the average inlet water temperature, TCThe set water temperature of the multi-split system is A, and the constant value of the water temperature deviation is A.
Step S303, if the system water temperature is not within the first temperature range, determining whether the system water temperature is within the second temperature range. The multi-split system is provided with a refrigerating mode and a heating mode, and in the refrigerating mode, the maximum value of the second temperature range is smaller than the minimum value of the first temperature range; in the heating mode, the minimum value of the second temperature range is greater than the maximum value of the first temperature range. The second temperature range does not intersect the first temperature range. The second temperature range is closer to the set water temperature T of the multi-split system than the second temperature rangeC。
For example, when the first temperature range is Tin≥TCAt + A, the second temperature range is TC+B≤Tin＜TC+A。
When T isin≥TCWhen + A is not satisfied, the water temperature of the system is not in the first temperature range, namely Tin＜TC+ A. And then continuously judging whether the water temperature of the system is in a second temperature range: t isC+B≤Tin＜TCAnd + A, wherein A and B are both water temperature deviation constants, and A is greater than B.
Step S304, if the water temperature of the system is in the second temperature range, based on the first preset water temperature change rate D1Obtaining a second preset water temperature change rate D2Wherein the second preset water temperature change rate D2Less than or equal to the first preset water temperature change rate D1I.e. D1＞D2。
When the system water temperature is in the second temperature range, since the system water temperature is closer to the set temperature in this embodiment, in order to avoid that the system water temperature fluctuates too much in response to the adjustment to affect the positioning temperature of the air-conditioning room, i.e. to keep the water temperature of the multi-split air-conditioning system stable, the step of adjusting the loading number of the compressors may be different from the step of the first embodiment of the method of the present invention, which will be described in detail below.
Specifically, if TC+B≤Tin＜TCIf + A is established, the water temperature is changed according to a first preset water temperature change rate D1Determining a second preset water temperature change rate D2Wherein D is2＝k×D1And k is a percentage coefficient.
In step S305, if the system water temperature change rate is less than or equal to a second preset water temperature change rate, at least one compressor is loaded from unloaded compressors.
For example, if Δ Tt≤D2At least one compressor is loaded from among the unloaded compressors. For example, the time T can be spacedm1A compressor is loaded.
Step S306, if the water temperature change rate of the system is greater than the second preset water temperature change rate and less than the first preset water temperature change rate, keeping the current loading number of the compressors.
For example, if D2＜ΔTt＜D1Then the current loaded number of compressors is maintained.
Step S307, if the water temperature change rate of the system is greater than or equal to a first preset water temperature change rate D1Then at least one compressor is unloaded from the currently loaded compressors.
For example, if Δ Tt≥D1Then at least one compressor is unloaded from the currently loaded compressors. For example, the time T may be spacedm2One compressor is unloaded. T ism2Is the interval time between two unloading actions.
It is easy to understand that two or more compressors can be loaded from unloaded compressors, so that the water temperature of the system can respond to the requirement of a user more quickly, and the frequent loading and unloading of the unit can be prevented, and the reliability of the compressors and the electric control is influenced. In order to maintain the stability of the water temperature of the system and avoid the great fluctuation of the water temperature of the multi-split system, it is preferable to unload one compressor at a time.
And S400, if the water temperature of the system is not in the second temperature range, keeping the current loading quantity of the compressors. For example, if Tin＜TC+ B, the current loaded number of compressors is maintained.
A fourth embodiment of the compressor loading control method of the present invention is presented based on the first through third embodiments of the compressor loading control method of the present invention. Referring to fig. 5, fig. 5 is a schematic flow chart of the present embodiment. In this embodiment, the control method includes:
step S401, acquiring the system water temperature, the system water temperature change rate and a first preset water temperature change rate of the multi-split system.
Step S402, judging whether the system water temperature is in a first temperature range.
For example, the first temperature range is Tin≥TC+ A, wherein, TinIs the average inlet water temperature, TCThe set water temperature of the multi-split system is A, and the constant value of the water temperature deviation is A.
In step S403, if the system water temperature is not within the first temperature range, it is determined whether the system water temperature is within the second temperature range.
In step S404, if the system water temperature is not within the second temperature range, it is determined whether the system water temperature is within a third temperature range. Wherein in the cooling mode, a maximum value of the third temperature range is smaller than a minimum value of the second temperature range, and in the heating mode, the minimum value of the third temperature range is larger than the maximum value of the second temperature range.
For example, when the second temperature range is TC+B≤Tin＜TCAt + A, the third temperature range is Tin＜TC+C。
Step S405, if the water temperature of the system is in a third temperature range, unloading at least one compressor from the currently loaded compressors. Specifically, if TC+B≤Tin＜TCNor is + A true, i.e. Tin＜TC+ B. Judging whether the water temperature of the system is in a third temperature range: t isin＜TCAnd + C, wherein C is a constant water temperature deviation, and A > B > C.
When the system water temperature is in the third temperature range, since the system water temperature is closer to the set temperature in this embodiment than in the third embodiment, in order to avoid the influence of the too large fluctuation of the system water temperature in response to the adjustment on the positioning temperature of the air-conditioning room, i.e. to keep the water temperature of the multi-split system stable, the step of adjusting the loading amount of the compressor may be different from the steps of the second and third embodiments of the method of the present invention, which will be described in detail below.
Can be spaced by a time Tm2One compressor is unloaded. T ism2Is the interval time between two unloading actions.
And step S406, if the water temperature of the system is not in the third temperature range, keeping the current loading quantity of the compressors. Namely the water temperature T of the systemin∈[TC+C，TC+B)。
In this embodiment, when the system water temperature in the multi-split air-conditioning system is gradually close to the set water temperature, the compressor can be unloaded, the influence of the system water capacity and the conveying distance is avoided, the system water temperature exceeds the set water temperature under the influence of excessive compressors, even if the loading and unloading actions of the compressors in the multi-split air-conditioning system are more coordinated, the situation that the system water temperature is influenced by the compressors and fluctuates too much to cause frequent loading and unloading of the compressors is avoided, the comfort of the air-conditioning room temperature is improved, the frequent loading and unloading of the units is prevented, and the reliability of the compressors and the electric control is improved.
Further, in one embodiment, the step of unloading at least one compressor from the currently loaded compressors comprises:
(1) the method comprises the steps of obtaining the running frequency of each currently loaded compressor and obtaining a first frequency threshold value of the compressor.
Specifically, the operating frequency is the real-time frequency of the currently loaded individual compressor, and the first frequency threshold is the compressor frequency constant Xhz.
(2) And determining the compressor to be selected with the running frequency lower than the first frequency threshold value according to the running frequency of each currently loaded compressor.
(3) One compressor is unloaded from the candidate compressors.
Specifically, in the step of unloading at least one compressor, the compressor with the operating frequency lower than the compressor frequency constant Xhz is unloaded preferentially to prevent the service life of the compressor operated at high frequency from being influenced by frequent start and stop. In order to maintain the stability of the water temperature of the system and avoid the great fluctuation of the water temperature of the multi-split system, one compressor is preferably loaded each time.
Further, in one embodiment, the step of loading at least one compressor from unloaded compressors comprises:
(1) and acquiring the running frequency of the currently loaded compressor and a second frequency threshold.
In particular, the second frequency threshold f2Is also a constant.
For example, the second frequency threshold is obtained by the following formula:
f2＝fmax×i；
wherein f is2Is a second frequency threshold, fmaxI is a percentage coefficient for the maximum opening frequency of the compressor.
(2) And judging whether the running frequency of each currently loaded compressor is greater than or equal to a second frequency threshold value.
Specifically, f is judged to be not less than f2Whether or not this is true.
(3) And if the running frequency of each currently loaded compressor is greater than or equal to the second frequency threshold value, loading one compressor from unloaded compressors.
Specifically, if f ≧ f2If so, one compressor is loaded from the unloaded compressors. In order to maintain the stability of the water temperature of the system and avoid the great fluctuation of the water temperature of the multi-split system, it is preferable to unload one compressor at a time.
(4) And if the running frequency of the currently loaded compressor is less than the second frequency threshold value, the loading of at least one compressor from the unloaded compressors is abandoned.
Specifically, if f < f2The loading of the compressor is abandoned in this judgment step until the next judgment period.
For ease of understanding, the present embodiment presents a specific implementation of the compressor load control method when operating in the heating mode. The multi-split system is used for the multi-split system, and the multi-split system comprises at least 2 compressors. After receiving a starting-up command, the multi-online system is controlledThe hot mode operates. Obtaining the set water temperature TCThen, the average inlet water temperature T of the multi-split system is obtainedin. Judgment of Tin＜TC-whether Δ T is true, and if so, loading the first compressor from all compressors. Where Δ T is the boot offset constant.
During operation in the heating mode, it is determined whether the system water temperature is within a first temperature range, Tin≤TC-A is true, wherein A is a water temperature deviation constant. If Tin≤TCIf A is established, acquiring the system water temperature change rate delta T of the multi-split systemtAnd a first preset water temperature change rate D1. Determination of Delta Tt≤D1Whether or not this is true. If Δ Tt≤D1If true, the time T can be spacedm1A compressor is loaded. If not, the current loading number of the compressor is kept.
The number of compressor loads increases and the system water temperature begins to rise. Then, T is judgedC-A＜Tin≤TC-B is true. If TC-A＜Tin≤TCB is satisfied, wherein B < A, the system water temperature change rate delta T of the multi-split system is obtainedtAnd a first preset water temperature change rate D1. And according to a first preset water temperature change rate D1Determining a second preset water temperature change rate D2. Wherein D is2＝k×D1And k is a percentage coefficient.
If Δ Tt≤k·D1Then, the time interval T is from the unloaded compressorm1A compressor is loaded. If k.D1＜ΔTt＜D1Then the current loaded number of compressors is maintained. If Δ Tt≥D1Then a time T is spaced from the currently loaded compressorm2One compressor is unloaded. T ism2Is the interval time between two unloading actions.
The number of compressor loads increases and the system water temperature begins to rise. Then, T is judgedin≤TC-C is true, wherein C < B < A. If Tin≤TCif-C is true, the compressor is maintainedThe current load number, neither the load compressor action nor the unload compressor action is performed.
As the heating mode continues to operate, the system water temperature continues to rise. Judgment of Tin＞TC-C is true, if true, the time T is separated from the currently loaded compressorm2One compressor is unloaded.
Compared with the method that only the system water temperature is used as the judgment condition for the compressor loading, the compressor loading control method provided by the embodiment of the invention controls the loading of the compressor by combining the system water temperature change rate of the multi-split system on the basis of the system water temperature, so that the compressor loading control of the multi-split system can timely respond to the temperature requirement of a room.
In addition, the compressor loading control method provided by the embodiment of the invention takes the water temperature change rate of the system as the loading judgment condition of the compressor, so that the water temperature is more stable in the running process of the multi-split air conditioning system, and the condition that the water temperature of the system is changed rapidly due to rapid rise and fall of the water temperature in the loading process of the compressor and the compressor is loaded and unloaded frequently due to the judgment condition of the water temperature of the system is avoided. Namely, the system water temperature of the multi-split system controlled by the compressor loading control method is more stable, and the user experience is better.
In addition, an embodiment of the present invention further provides a storage medium, where a compressor loading control program is stored on the storage medium, and the steps of the compressor loading control method as above are implemented when the compressor loading control program is executed by a processor. Therefore, a detailed description thereof will be omitted. In addition, the beneficial effects of the same method are not described in detail. For technical details not disclosed in embodiments of the computer-readable storage medium referred to in the present application, reference is made to the description of embodiments of the method of the present application. It is determined that, by way of example, the program instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where units illustrated as separate components may or may not be physically separate, and components illustrated as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus necessary general hardware, and may also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, the implementation of a software program is a more preferable embodiment for the present invention. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, where the computer software product is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a Read-only memory (ROM), a random-access memory (RAM), a magnetic disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

Claims (10)

1. A compressor loading control method for a multiple on-line system including at least 2 compressors, the control method comprising the steps of:
acquiring a system water temperature change rate and a first preset water temperature change rate of the multi-split system;
and adjusting the loading number of the compressors according to the water temperature change rate of the system and the first preset water temperature change rate.
2. The compressor load control method of claim 1, wherein prior to the step of adjusting the amount of compressor load based on the system water temperature rate of change and the first predetermined water temperature rate of change, the control method further comprises:
acquiring the system water temperature of the multi-split system;
judging whether the water temperature of the system is in a first temperature range or not;
the step of adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate comprises the following steps:
and if the system water temperature is within the first temperature range, adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate.
3. The compressor loading control method as claimed in claim 2, wherein the step of adjusting the loading amount of the compressor according to the system water temperature change rate and the first preset water temperature change rate comprises:
judging whether the water temperature change rate of the system is less than or equal to the first preset water temperature change rate or not;
if the change rate of the water temperature of the system is less than or equal to the first preset water temperature change rate, loading at least one compressor from unloaded compressors;
and if the water temperature change rate of the system is greater than the first preset water temperature change rate, keeping the current loading number of the compressors.
4. The compressor loading control method as set forth in claim 2, wherein after said step of determining whether the system water temperature is within a first temperature range, the control method further includes:
if the system water temperature is not within the first temperature range, judging whether the system water temperature is within a second temperature range, wherein the multi-split system is provided with a refrigeration mode and a heating mode, and in the refrigeration mode, the maximum value of the second temperature range is smaller than the minimum value of the first temperature range; in the heating mode, a minimum value of the second temperature range is greater than a maximum value of the first temperature range;
and if the system water temperature is within the second temperature range, adjusting the loading number of the compressors according to the system water temperature change rate and the first preset water temperature change rate.
5. The method as claimed in claim 4, wherein the step of adjusting the loading amount of the compressors according to the change rate of the system water temperature and the first preset water temperature change rate if the system water temperature is within the second temperature range comprises:
if the system water temperature is in the second temperature range, obtaining a second preset water temperature change rate based on the first preset water temperature change rate, wherein the second preset water temperature change rate is smaller than or equal to the first preset water temperature change rate;
if the change rate of the water temperature of the system is less than or equal to the second preset water temperature change rate, loading at least one compressor from unloaded compressors;
if the change rate of the water temperature of the system is greater than the second preset water temperature change rate and less than the first preset water temperature change rate, keeping the current loading number of the compressors;
and if the change rate of the water temperature of the system is greater than or equal to the first preset water temperature change rate, unloading at least one compressor from the currently loaded compressors.
6. The compressor loading control method as set forth in claim 4, wherein after determining whether the system water temperature is within a second temperature range if the system water temperature is not within the first temperature range, the control method further includes:
if the system water temperature is not in the second temperature range, judging whether the system water temperature is in a third temperature range, wherein in the refrigeration mode, the maximum value of the third temperature range is smaller than the minimum value of the second temperature range; in the heating mode, a minimum value of the third temperature range is greater than a maximum value of the second temperature range;
and if the system water temperature is within the third temperature range, unloading at least one compressor from the currently loaded compressors.
7. The compressor loading control method according to claim 5 or 6, wherein the step of unloading at least one compressor from the currently loaded compressors comprises:
the method comprises the steps of obtaining the running frequency of each currently loaded compressor, and obtaining a first frequency threshold value of the compressor;
determining a compressor to be selected with the running frequency lower than a first frequency threshold value according to the running frequency of each currently loaded compressor;
and unloading one compressor from the candidate compressors.
8. The compressor loading control method according to any one of claims 3 to 5, wherein the step of loading at least one compressor from unloaded compressors comprises:
acquiring the running frequency of the currently loaded compressor and a second frequency threshold;
judging whether the running frequency of each currently loaded compressor is greater than or equal to the second frequency threshold value;
and if the running frequency of the currently loaded compressor is greater than or equal to the second frequency threshold value, loading the pre-loaded compressor.
9. A multi-split system, characterized in that the multi-split system comprises at least 2 compressors, a memory, a processor and a compressor loading control program stored on the memory and executable on the processor, the compressor loading control program being configured to implement the steps of the compressor loading control method according to any one of claims 1 to 8.
10. A storage medium having a compressor loading control program stored thereon, the compressor loading control program when executed by a processor implementing the steps of the compressor loading control method according to any one of claims 1 to 8.
CN202011169028.XA 2020-10-27 2020-10-27 Compressor loading control method, multi-split system and storage medium Pending CN112303807A (en)

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