CN107763886B - Control method and system of air conditioner and air conditioner - Google Patents
Control method and system of air conditioner and air conditioner Download PDFInfo
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- CN107763886B CN107763886B CN201711045082.1A CN201711045082A CN107763886B CN 107763886 B CN107763886 B CN 107763886B CN 201711045082 A CN201711045082 A CN 201711045082A CN 107763886 B CN107763886 B CN 107763886B
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Abstract
The invention provides a control method of an air conditioner, a control system of the air conditioner and the air conditioner, wherein the control method of the air conditioner comprises the following steps: judging whether the compressor is in a frequency-limited working state or not; and if the compressor is in a frequency-limited working state, controlling to operate any compressor or all compressors according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limitation. According to the control method of the air conditioner, when the compressor is in the frequency limiting working state, any compressor or all compressors are controlled to operate according to the total energy requirement of the internal unit or the working frequency of the compressor before frequency limiting, so that the air conditioner can better adapt to the energy requirement of the internal unit after frequency limiting, and the problem that a plurality of external units are connected in parallel to operate or one external unit has a plurality of compressors can be distributed is solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner, a control system of the air conditioner and the air conditioner.
Background
When a plurality of outdoor units of the multi-split air conditioning system are connected in parallel to form a system, the opening of each outdoor unit is generally controlled according to the capacity requirement of the indoor unit, one outdoor unit is opened when the capacity requirement of the indoor unit is small, and all the outdoor units are operated when the capacity requirement of the indoor unit is large. However, the situation that the system operation effect is poor or the operation is not energy-saving may occur when the outdoor unit is controlled to start or stop only according to the capacity requirement of the indoor unit is judged, for example, when the outdoor ambient temperature is too high or the heat exchange is poor when the highest frequency of one outdoor unit is operated according to the capacity requirement of the indoor unit, the frequency-limited operation is easy to occur when the pressure is high and the current is high, the capacity of the outdoor unit after the frequency limitation cannot meet the requirement of the indoor unit, the refrigeration effect of the indoor unit is poor, and the normal use and the comfortable experience of a user.
Similarly, when an outdoor unit of the multi-split air conditioner system has a plurality of compressors, the starting of each compressor is generally controlled according to the capacity requirement of the outdoor unit, one compressor is started when the capacity requirement of the outdoor unit is small, and the plurality of compressors are operated when the capacity requirement of the outdoor unit is large. However, the situation that the system operation effect is poor or the operation is not energy-saving may occur when the compressor is controlled to start or stop only according to the capacity requirement of the outdoor unit is judged, for example, when the highest frequency of one compressor is operated according to the capacity requirement of the outdoor unit, the outdoor environment temperature is too high or the heat exchange is poor, the frequency-limited operation is easy to occur when the pressure is high and the current is large, the operation capacity of the last compressor after the frequency limitation cannot meet the requirement of the indoor unit, the refrigeration effect of the indoor unit is poor, and the normal use and the comfortable experience of a user are affected.
Disclosure of Invention
In order to solve at least one of the above technical problems, an embodiment of a first aspect of the present invention proposes a control method of an air conditioner.
The embodiment of the second aspect of the invention also provides a control system of the air conditioner.
In an embodiment of the third aspect of the invention, an air conditioner is also provided.
In view of the above, according to an embodiment of the first aspect of the present invention, the present invention provides a control method of an air conditioner, the air conditioner including an internal unit and at least one external unit, the at least one external unit including a plurality of compressors, the control method of the air conditioner including: judging whether the compressor is in a frequency-limited working state or not; and if the compressor is in a frequency-limited working state, controlling to operate any compressor or all compressors according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limitation.
According to the control method of the air conditioner, when the compressor is in the frequency limiting working state, any compressor or all compressors are controlled to operate according to the total energy requirement of the internal unit or the working frequency of the compressor before frequency limiting, so that the air conditioner can better adapt to the energy requirement of the internal unit after frequency limiting, and the problem that a plurality of external units are connected in parallel to operate or one external unit has a plurality of compressors can be distributed is solved. If the frequency is limited, the low-frequency operation of a plurality of compressors or a plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation from one original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor units is solved, and the use comfort of users is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
In addition, the control method of the air conditioner in the above embodiment provided by the present invention may further have the following additional technical features:
in any of the above technical solutions, preferably, the step of controlling to operate any one or all of the compressors according to the total energy requirement of the indoor unit specifically includes: if the total energy requirement of the internal machine is greater than a first preset energy requirement value, controlling all compressors to operate; if the total energy requirement of the internal machine is less than a second preset energy requirement, controlling to operate any compressor; wherein the first preset energy requirement is greater than the second preset energy requirement.
In the technical scheme, if the total energy of the internal machine is greater than a first preset energy requirement value, the energy requirement is greater at the moment, all compressors need to be operated to realize greater refrigerating or heating capacity, and the working effect of the air conditioner is ensured; if the total energy requirement of the inner unit is smaller than the second preset energy requirement, the energy requirement at the moment is smaller, and only one compressor (or one outer unit) can be operated, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In any of the above technical solutions, preferably, the step of controlling to operate any one or all of the compressors according to the operating frequency of the compressors before frequency limiting specifically includes: if the working frequency of the compressor before frequency limiting is greater than a first preset frequency, controlling to operate all the compressors; if the working frequency of the compressor before frequency limiting is less than a second preset frequency, controlling to operate any compressor; the first preset frequency is greater than the second preset frequency.
In the technical scheme, if the working frequency of the compressor before frequency limiting is greater than a first preset frequency, the compressor before frequency limiting needs larger output to meet the requirement of an internal machine, so that all the compressors are selectively controlled to operate at low frequency after frequency limiting, and the refrigerating or heating capacity of the air conditioner after frequency limiting is improved; if the working frequency of the compressor before frequency limiting is lower than the second preset frequency, the compressor before frequency limiting needs smaller output to meet the requirement of the internal unit, and therefore any compressor (or any external unit) is selected to be controlled to operate after frequency limiting, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In any of the above technical solutions, preferably, the method further includes: if the compressor is not in the frequency-limited working state and the total energy requirement of the internal machine is greater than a third preset energy requirement value, controlling to operate all the compressors; if the compressors are not in the frequency-limited working state and the total energy requirement of the internal machine is less than a fourth preset energy requirement value, controlling to operate any one of the compressors; and the third preset energy requirement is greater than the fourth preset energy requirement.
In the technical scheme, when the compressor is not in the frequency-limited working state, generally, the air conditioner is in a normal working state at the moment, and the full-on or only partial-on compressor or the external unit is selected by comparing the total energy requirement of the internal unit with the third preset energy requirement or the fourth preset energy requirement, so that the energy requirement of the internal unit is met under the condition of reasonable energy consumption.
The fourth preset energy requirement is greater than the first preset energy requirement under the preferable condition, so that the energy requirement when the outdoor unit (or the compressor) is switched from single opening to full opening is reduced after frequency limitation, the outdoor unit can be fully opened and operated at low frequency even when the outdoor unit has small energy requirement, and the refrigerating or heating capacity of the air conditioner is improved.
In any of the above technical solutions, preferably, the step of determining whether the compressor is in the frequency-limited operating state specifically includes: detecting the ambient temperature, the exhaust pressure of the compressor and the current of the compressor; and if the environmental temperature is higher than the preset temperature, or the exhaust pressure of the compressor is higher than the preset pressure, or the current of the compressor is higher than the preset current, judging that the compressor is in a frequency-limiting working state.
According to the technical scheme, whether the air conditioner is in the frequency-limiting working state or not can be judged according to the ambient temperature, the exhaust pressure of the compressor and the current of the compressor, then the started compressor or the started external unit is selected, the accuracy of judging the working states of the air conditioner and the compressor can be met through the conditions, and whether the air conditioner or the compressor is in the frequency-limiting working state or not can be found as soon as possible.
In any of the above technical solutions, preferably, the method further includes: and judging whether the compressor is in a frequency-limited working state every preset time.
In the technical scheme, whether the air conditioner or the compressor is in the frequency-limited working state or not is periodically detected and judged, so that the working state of the air conditioner can be timely and efficiently adjusted, the actual requirements of users are met, and the use experience is improved. Wherein the preset time period is preferably 5 to 30 minutes.
Embodiments of the second aspect of the present invention also provide a control system of an air conditioner, the air conditioner including an internal unit and at least one external unit, the at least one external unit including a plurality of compressors, the control system of the air conditioner including: the judging unit is used for judging whether the compressor is in a frequency-limited working state or not; and the control unit is used for controlling any compressor or all compressors to run according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limitation if the compressor is in the frequency-limited working state.
According to the control system of the air conditioner, when the compressor is in the frequency limiting working state, any compressor or all compressors are controlled to operate according to the total energy requirement of the internal unit or the working frequency of the compressor before frequency limiting, so that the air conditioner can better adapt to the energy requirement of the internal unit after frequency limiting, and the problem that a plurality of external units are connected in parallel to operate or one external unit has a plurality of compressors can be distributed is solved. If the frequency is limited, the low-frequency operation of a plurality of compressors or a plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation from one original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor units is solved, and the use comfort of users is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
In addition, the control system of the air conditioner in the above embodiment provided by the present invention may further have the following additional technical features:
in the above technical solution, preferably, the control unit is specifically configured to control to operate all the compressors if the total energy requirement of the internal machine is greater than a first preset energy requirement; the control unit is specifically used for controlling to operate any compressor if the total energy requirement of the internal machine is less than a second preset energy requirement; wherein the first preset energy requirement is greater than the second preset energy requirement.
In the technical scheme, if the total energy of the internal machine is greater than a first preset energy requirement value, the energy requirement is greater at the moment, all compressors need to be operated to realize greater refrigerating or heating capacity, and the working effect of the air conditioner is ensured; if the total energy requirement of the inner unit is smaller than the second preset energy requirement, the energy requirement at the moment is smaller, and only one compressor (or one outer unit) can be operated, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In any of the above technical solutions, preferably, the control unit is specifically configured to control to operate all the compressors if the operating frequency of the compressors before frequency limiting is greater than a first preset frequency; the control unit is specifically used for controlling any compressor to run if the working frequency of the compressor before frequency limitation is less than a second preset frequency; the first preset frequency is greater than the second preset frequency.
In the technical scheme, if the working frequency of the compressor before frequency limiting is greater than a first preset frequency, the compressor before frequency limiting needs larger output to meet the requirement of an internal machine, so that all the compressors are selectively controlled to operate at low frequency after frequency limiting, and the refrigerating or heating capacity of the air conditioner after frequency limiting is improved; if the working frequency of the compressor before frequency limiting is lower than the second preset frequency, the compressor before frequency limiting needs smaller output to meet the requirement of the internal unit, and therefore any compressor (or any external unit) is selected to be controlled to operate after frequency limiting, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In any of the above technical solutions, preferably, the control unit is specifically configured to control to operate all the compressors if the compressors are not in the frequency-limited working state and the total energy requirement of the internal machine is greater than a third preset energy requirement; the control unit is specifically used for controlling any compressor to operate if the compressor is not in the frequency-limited working state and the total energy requirement of the internal machine is less than a fourth preset energy requirement; and the third preset energy requirement is greater than the fourth preset energy requirement.
In the technical scheme, when the compressor is not in the frequency-limited working state, generally, the air conditioner is in a normal working state at the moment, and the full-on or only partial-on compressor or the external unit is selected by comparing the total energy requirement of the internal unit with the third preset energy requirement or the fourth preset energy requirement, so that the energy requirement of the internal unit is met under the condition of reasonable energy consumption.
The fourth preset energy requirement is greater than the first preset energy requirement under the preferable condition, so that the energy requirement when the outdoor unit (or the compressor) is switched from single opening to full opening is reduced after frequency limitation, the outdoor unit can be fully opened and operated at low frequency even when the outdoor unit has small energy requirement, and the refrigerating or heating capacity of the air conditioner is improved.
In any of the above technical solutions, preferably, the method further includes: a detection unit for detecting an ambient temperature, a discharge pressure of the compressor, and a current of the compressor; the judging unit is specifically used for judging that the compressor is in a frequency-limited working state if the ambient temperature is higher than the preset temperature, or the exhaust pressure of the compressor is higher than the preset pressure, or the current of the compressor is higher than the preset current.
According to the technical scheme, whether the air conditioner is in the frequency-limiting working state or not can be judged according to the ambient temperature, the exhaust pressure of the compressor and the current of the compressor, then the started compressor or the started external unit is selected, the accuracy of judging the working states of the air conditioner and the compressor can be met through the conditions, and whether the air conditioner or the compressor is in the frequency-limiting working state or not can be found as soon as possible.
In any of the above technical solutions, preferably, the determining unit is further configured to determine whether the compressor is in the frequency-limited operating state every preset time period.
In the technical scheme, whether the air conditioner or the compressor is in the frequency-limited working state or not is periodically detected and judged, so that the working state of the air conditioner can be timely and efficiently adjusted, the actual requirements of users are met, and the use experience is improved. Wherein the preset time period is preferably 5 to 30 minutes.
Embodiments of the third aspect of the present invention also provide an air conditioner, including: an internal machine; at least one outdoor unit including a plurality of compressors; and a control system of an air conditioner according to an embodiment of the second aspect of the present invention.
By adopting the control system of the air conditioner provided by the embodiment of the second aspect of the invention, the problem that a plurality of outdoor units are in parallel operation or one outdoor unit has a plurality of compressors which need to be distributed is solved, for example, after frequency limitation, the low-frequency operation of the plurality of compressors or the plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation of the original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor unit is solved, and the use comfort of a user is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
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 above 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 illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 4 is a schematic block diagram of a control system of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of an air conditioner and a control system of an air conditioner according to some embodiments of the present invention are described below with reference to fig. 1 to 4.
As shown in fig. 1, a flow chart of a control method of an air conditioner according to an embodiment of the present invention is used for controlling the air conditioner, the air conditioner includes an inner unit and at least one outer unit, the at least one outer unit includes a plurality of compressors, and the control method of the air conditioner includes the following steps:
step S102, judging whether the compressor is in a frequency-limited working state, if so, entering step S104, otherwise, returning to step S102;
and step S104, controlling to operate any compressor or all compressors according to the total energy requirement of the internal machine or the working frequency of the compressors before frequency limitation.
In the embodiment, when the compressor is in the frequency-limited working state, any compressor or all compressors are controlled to operate according to the total energy requirement of the internal unit or the working frequency of the compressor before frequency limitation, so that the air conditioner can better adapt to the energy requirement of the internal unit after frequency limitation, and the problem that a plurality of external units are connected in parallel to operate or one external unit has a plurality of compressors to be distributed is solved. If the frequency is limited, the low-frequency operation of a plurality of compressors or a plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation from one original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor units is solved, and the use comfort of users is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
As shown in fig. 2, a flow chart of a control method of an air conditioner according to an embodiment of the present invention is used for controlling the air conditioner, the air conditioner includes an inner unit and at least one outer unit, the at least one outer unit includes a plurality of compressors, and the control method of the air conditioner includes the following steps:
step S202, judging whether the compressor is in a frequency-limiting working state, if so, entering step S204, otherwise, entering step S212;
step S204, judging whether the total energy requirement of the internal machine is greater than a first preset energy requirement value, if so, entering step S206, otherwise, entering step S208;
step S206, controlling all compressors to run;
step S208, judging whether the total energy requirement of the internal machine is smaller than a second preset energy requirement value, if so, entering step S210, otherwise, returning to step S204;
step S210, controlling to operate any compressor;
step S212, judging whether the total energy requirement of the internal machine is greater than a third preset energy requirement value, if so, entering step S214, otherwise, entering step S216;
step S214, controlling all compressors to run;
step S216, judging whether the total energy requirement of the internal machine is smaller than a fourth preset energy requirement value, if so, entering step S218, otherwise, returning to step S204;
and step S218, controlling to operate any compressor.
In the embodiment, if the total energy requirement of the internal machine is greater than the first preset energy requirement value, the energy requirement at the moment is greater, all compressors need to be operated to realize greater refrigerating or heating capacity, and the working effect of the air conditioner is ensured; if the total energy requirement of the inner unit is smaller than the second preset energy requirement, the energy requirement at the moment is smaller, and only one compressor (or one outer unit) can be operated, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In addition, when the compressor is not in the frequency-limited working state, generally, the air conditioner is in a normal working state at the moment, and the energy requirement of the internal machine is met under the condition of reasonable energy consumption by comparing the total energy requirement of the internal machine with the third preset energy requirement or the fourth preset energy requirement and selecting a fully-opened or only partially-opened compressor or external machine.
The fourth preset energy requirement is greater than the first preset energy requirement under the preferable condition, so that the energy requirement when the outdoor unit (or the compressor) is switched from single opening to full opening is reduced after frequency limitation, the outdoor unit can be fully opened and operated at low frequency even when the outdoor unit has small energy requirement, and the refrigerating or heating capacity of the air conditioner is improved.
As shown in fig. 3, a flow chart of a control method of an air conditioner according to an embodiment of the present invention is a control method of an air conditioner, the control method being used for controlling the air conditioner, the air conditioner including an indoor unit and at least one outdoor unit, the at least one outdoor unit including a plurality of compressors, the control method of the air conditioner including the steps of:
step S302, judging whether the compressor is in a frequency-limiting working state, if so, entering step S304, otherwise, entering step S312;
step S304, judging whether the working frequency of the compressor before frequency limiting is greater than a first preset frequency, if so, entering step S306, otherwise, entering step S308;
step S306, controlling all compressors to run;
step S308, judging whether the working frequency of the compressor before frequency limiting is less than a second preset frequency, if so, entering step S310, otherwise, returning to step S304;
step S310, controlling to operate any compressor;
step S312, judging whether the total energy requirement of the internal machine is greater than a third preset energy requirement value, if so, entering step S314, otherwise, entering step S316;
step S314, controlling all compressors to run;
step S316, judging whether the total energy requirement of the internal machine is smaller than a fourth preset energy requirement value, if so, entering step S318, otherwise, returning to step S304;
and step S318, controlling to operate any compressor.
In this embodiment, if the operating frequency of the compressor before frequency limiting is greater than the first preset frequency, it is indicated that the compressor before frequency limiting needs a larger output to meet the demand of the internal machine, so that all the compressors are selectively controlled to operate at a low frequency after frequency limiting, thereby improving the cooling or heating capacity of the air conditioner after frequency limiting; if the working frequency of the compressor before frequency limiting is lower than the second preset frequency, the compressor before frequency limiting needs smaller output to meet the requirement of the internal unit, and therefore any compressor (or any external unit) is selected to be controlled to operate after frequency limiting, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In addition, when the compressor is not in the frequency-limited working state, generally, the air conditioner is in a normal working state at the moment, and the energy requirement of the internal machine is met under the condition of reasonable energy consumption by comparing the total energy requirement of the internal machine with the third preset energy requirement or the fourth preset energy requirement and selecting a fully-opened or only partially-opened compressor or external machine.
The fourth preset energy requirement is greater than the first preset energy requirement under the preferable condition, so that the energy requirement when the outdoor unit (or the compressor) is switched from single opening to full opening is reduced after frequency limitation, the outdoor unit can be fully opened and operated at low frequency even when the outdoor unit has small energy requirement, and the refrigerating or heating capacity of the air conditioner is improved.
In an embodiment of the present invention, preferably, the step of determining whether the compressor is in the frequency-limited operating state includes: detecting the ambient temperature, the exhaust pressure of the compressor and the current of the compressor; and if the environmental temperature is higher than the preset temperature, or the exhaust pressure of the compressor is higher than the preset pressure, or the current of the compressor is higher than the preset current, judging that the compressor is in a frequency-limiting working state.
In the embodiment, whether the air conditioner is in the frequency-limiting working state or not can be judged according to the ambient temperature, the exhaust pressure of the compressor and the current of the compressor, and then the started compressor or the started external unit is selected.
In one embodiment of the present invention, preferably, the method further includes: and judging whether the compressor is in a frequency-limited working state every preset time.
In this embodiment, whether periodically detect and judge air conditioner or compressor and be in limit frequency operating condition to guarantee that the air conditioner can in time, high-efficiently adjust operating condition, satisfy user's actual demand, promote to use and experience. Wherein the preset time period is preferably 5 to 30 minutes.
The present invention also provides a control system 4 of an air conditioner, as shown in fig. 4, for controlling the air conditioner, the air conditioner includes an internal unit and at least one external unit, the at least one external unit includes a plurality of compressors, the control system 4 of the air conditioner includes: a judging unit 402, configured to judge whether the compressor is in a frequency-limited operating state; and the control unit 404 is configured to control to operate any one of the compressors or all the compressors according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limiting if the compressor is in the frequency-limiting working state.
According to the control system 4 of the air conditioner, when the compressor is in the frequency limiting working state, any compressor or all compressors are controlled to operate according to the total energy requirement of the internal unit or the working frequency of the compressor before frequency limiting, so that the air conditioner can better adapt to the energy requirement of the internal unit after frequency limiting, and the problem that a plurality of external units are connected in parallel to operate or one external unit has a plurality of compressors and needs to be distributed is solved. If the frequency is limited, the low-frequency operation of a plurality of compressors or a plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation from one original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor units is solved, and the use comfort of users is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
In an embodiment of the present invention, preferably, as shown in fig. 4, the control unit 404 is specifically configured to control to operate all the compressors if the total energy requirement of the internal machine is greater than the first preset energy requirement; the control unit 404 is specifically configured to control to operate any one of the compressors if the total energy requirement of the internal machine is less than a second preset energy requirement; wherein the first preset energy requirement is greater than the second preset energy requirement.
In the embodiment, if the total energy requirement of the internal machine is greater than the first preset energy requirement value, the energy requirement at the moment is greater, all compressors need to be operated to realize greater refrigerating or heating capacity, and the working effect of the air conditioner is ensured; if the total energy requirement of the inner unit is smaller than the second preset energy requirement, the energy requirement at the moment is smaller, and only one compressor (or one outer unit) can be operated, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In an embodiment of the present invention, preferably, as shown in fig. 4, the control unit 404 is specifically configured to control to operate all the compressors if the operating frequency of the compressors before frequency limiting is greater than a first preset frequency; the control unit 404 is specifically configured to control to operate any one of the compressors if the operating frequency of the compressor before frequency limiting is less than a second preset frequency; the first preset frequency is greater than the second preset frequency.
In this embodiment, if the operating frequency of the compressor before frequency limiting is greater than the first preset frequency, it is indicated that the compressor before frequency limiting needs a larger output to meet the demand of the internal machine, so that all the compressors are selectively controlled to operate at a low frequency after frequency limiting, thereby improving the cooling or heating capacity of the air conditioner after frequency limiting; if the working frequency of the compressor before frequency limiting is lower than the second preset frequency, the compressor before frequency limiting needs smaller output to meet the requirement of the internal unit, and therefore any compressor (or any external unit) is selected to be controlled to operate after frequency limiting, so that the sufficient refrigerating or heating capacity of the air conditioner can be ensured, and the energy consumption of the air conditioner can be reduced as much as possible.
In an embodiment of the present invention, preferably, as shown in fig. 4, the control unit 404 is specifically configured to control to operate all the compressors if the compressors are not in the frequency-limited operating state and the total energy requirement of the internal machine is greater than a third preset energy requirement; the control unit 404 is specifically configured to control to operate any one of the compressors if the compressor is not in the frequency-limited working state and the total energy requirement of the internal machine is less than a fourth preset energy requirement; and the third preset energy requirement is greater than the fourth preset energy requirement.
In this embodiment, when the compressor is not in the frequency-limited operating state, generally, the air conditioner is in a normal operating state at this time, and the energy requirement of the internal unit is met under the condition of reasonable energy consumption by comparing the total energy requirement of the internal unit with the third preset energy requirement or the fourth preset energy requirement and selecting a fully-opened or only partially-opened compressor or external unit.
The fourth preset energy requirement is greater than the first preset energy requirement under the preferable condition, so that the energy requirement when the outdoor unit (or the compressor) is switched from single opening to full opening is reduced after frequency limitation, the outdoor unit can be fully opened and operated at low frequency even when the outdoor unit has small energy requirement, and the refrigerating or heating capacity of the air conditioner is improved.
In an embodiment of the present invention, preferably, as shown in fig. 4, further includes: a detection unit 406 for detecting an ambient temperature, a discharge pressure of the compressor, and a current of the compressor; the determining unit 402 is specifically configured to determine that the compressor is in the frequency-limited working state if the ambient temperature is greater than the preset temperature, or the exhaust pressure of the compressor is greater than the preset pressure, or the current of the compressor is greater than the preset current.
In the embodiment, whether the air conditioner is in the frequency-limiting working state or not can be judged according to the ambient temperature, the exhaust pressure of the compressor and the current of the compressor, and then the started compressor or the started external unit is selected.
In an embodiment of the present invention, preferably, as shown in fig. 4, the determining unit 402 is further configured to determine whether the compressor is in the frequency-limited operation state every preset time period.
In this embodiment, whether periodically detect and judge air conditioner or compressor and be in limit frequency operating condition to guarantee that the air conditioner can in time, high-efficiently adjust operating condition, satisfy user's actual demand, promote to use and experience. Wherein the preset time period is preferably 5 to 30 minutes.
The present invention also provides an air conditioner, comprising: an internal machine; at least one outdoor unit including a plurality of compressors; and a control system 4 of an air conditioner according to an embodiment of the second aspect of the present invention.
By adopting the control system 4 of the air conditioner provided by the embodiment of the second aspect of the invention, the problem that a plurality of outdoor units are in parallel operation or one outdoor unit has a plurality of compressors which need to be distributed is solved, for example, after frequency limitation, the low-frequency operation of the plurality of compressors or the plurality of outdoor units is equivalent to the increase of the output of the compressors, the operation of the original outdoor unit to all the outdoor units is equivalent to the increase of the area of a heat exchanger, the problem of poor refrigerating or heating effect of the indoor unit is solved, and the use comfort of users is improved; or only one external machine or one compressor is selected to operate after frequency limitation, so that energy consumption is reduced as much as possible while meeting the energy requirement.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A control method of an air conditioner including an indoor unit and at least one outdoor unit including a plurality of compressors, the method comprising:
judging whether the compressor is in a frequency-limited working state or not;
if the compressor is in a frequency-limited working state, controlling to operate any one or all of the compressors according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limitation;
the step of controlling to operate any one or all of the compressors according to the total energy requirement of the internal machine specifically comprises the following steps:
if the total energy requirement of the internal machine is greater than a first preset energy requirement value, controlling all the compressors to operate;
if the total energy requirement of the internal machine is less than a second preset energy requirement value, controlling to operate any one compressor;
wherein the first preset energy requirement is greater than the second preset energy requirement;
the step of controlling to operate any one or all of the compressors according to the working frequency of the compressors before frequency limiting specifically comprises the following steps:
if the working frequency of the compressor before frequency limiting is greater than a first preset frequency, controlling to operate all the compressors;
if the working frequency of the compressor before frequency limiting is less than a second preset frequency, controlling to operate any one compressor;
wherein the first preset frequency is greater than the second preset frequency.
2. The control method of an air conditioner according to claim 1, further comprising:
if the compressor is not in a frequency-limited working state and the total energy requirement of the internal machine is greater than a third preset energy requirement value, controlling all the compressors to operate;
if the compressor is not in a frequency-limited working state and the total energy requirement of the internal machine is smaller than a fourth preset energy requirement value, controlling to operate any one compressor;
and the third preset energy requirement is greater than the fourth preset energy requirement.
3. The method according to claim 1, wherein the step of determining whether the compressor is in the frequency-limited operation state specifically comprises:
detecting an ambient temperature, a discharge pressure of the compressor, and a current of the compressor;
and if the environment temperature is higher than the preset temperature, or the exhaust pressure of the compressor is higher than the preset pressure, or the current of the compressor is higher than the preset current, judging that the compressor is in a frequency-limited working state.
4. The control method of an air conditioner according to claim 1, further comprising:
and judging whether the compressor is in a frequency-limited working state every other preset time.
5. A control system of an air conditioner, the air conditioner includes an inner unit and at least one outer unit, the at least one outer unit includes a plurality of compressors, characterized in that the control system of the air conditioner includes:
the judging unit is used for judging whether the compressor is in a frequency-limited working state or not;
the control unit is used for controlling any compressor or all compressors to run according to the total energy requirement of the internal machine or the working frequency of the compressor before frequency limitation if the compressor is in a frequency-limited working state;
the control unit is specifically used for controlling all the compressors to operate if the total energy requirement of the internal machine is greater than a first preset energy requirement value;
the control unit is specifically used for controlling to operate any one of the compressors if the total energy requirement of the internal machine is smaller than a second preset energy requirement;
wherein the first preset energy requirement is greater than the second preset energy requirement;
the control unit is specifically used for controlling all the compressors to operate if the working frequency of the compressors before frequency limiting is greater than a first preset frequency;
the control unit is specifically used for controlling any one compressor to run if the working frequency of the compressor before frequency limitation is less than a second preset frequency;
wherein the first preset frequency is greater than the second preset frequency.
6. The control system of an air conditioner according to claim 5,
the control unit is specifically used for controlling all the compressors to operate if the compressors are not in a frequency limiting working state and the total energy requirement of the internal machine is greater than a third preset energy requirement value;
the control unit is specifically used for controlling to operate any one of the compressors if the compressor is not in a frequency-limited working state and the total energy requirement of the internal machine is less than a fourth preset energy requirement value;
and the third preset energy requirement is greater than the fourth preset energy requirement.
7. The control system of an air conditioner according to claim 5, further comprising:
a detection unit for detecting an ambient temperature, a discharge pressure of the compressor, and a current of the compressor;
the judging unit is specifically configured to judge that the compressor is in a frequency-limited working state if the ambient temperature is greater than a preset temperature, or the exhaust pressure of the compressor is greater than a preset pressure, or the current of the compressor is greater than a preset current.
8. The control system of an air conditioner according to claim 5,
the judging unit is also used for judging whether the compressor is in a frequency-limiting working state every preset time.
9. An air conditioner, comprising:
an internal machine;
at least one outdoor unit including a plurality of compressors; and
the control system of an air conditioner according to any one of claims 5 to 8.
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| CN109556258B (en) * | 2018-11-06 | 2021-03-16 | 广东美的暖通设备有限公司 | Air conditioning system and control method thereof |
| CN109297155B (en) * | 2018-11-29 | 2020-11-03 | 宁波奥克斯电气股份有限公司 | Compressor protection method and device and air conditioner |
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