CN115900048A - Noise control method for multi-split air conditioner - Google Patents

Abstract

The invention discloses a noise control method of a multi-split air conditioner, which comprises the following steps: when the air conditioner operates in a refrigerating mode, acquiring real-time noise values of indoor environments where the selected indoor units are located and real-time starting loads of all the indoor units; when the real-time noise value is larger than the real-time noise threshold value, executing the following noise reduction control: when the real-time starting load is larger than the set starting load, at least controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state to reduce the noise generated by the selected indoor unit; and when the real-time starting load is not greater than the set starting load, keeping the operation parameters of the other indoor units in the operation state unchanged, and at least controlling the operation parameters of the selected indoor unit to reduce the noise generated by the selected indoor unit. By applying the method and the device, the air conditioner control is executed based on the state of the indoor unit of the multi-split air conditioner, and the overall performance of the air conditioner is improved.

Description

Noise control method for multi-split air conditioner

Technical Field

The invention belongs to the technical field of air treatment, particularly relates to a noise treatment technology of an air conditioner, and more particularly relates to a noise control method of a multi-split air conditioner.

Background

The air conditioner utilizes the compressor, the indoor heat exchanger, the outdoor heat exchanger, the throttling device and the like to form a refrigerant circulating system, and utilizes the circulation of the refrigerant to execute the functions of refrigeration, heating, dehumidification and the like, thereby realizing the regulation of indoor air and providing comfortable environment for indoor people.

Although the air conditioner can adjust the comfort of the indoor environment, when the air conditioner operates, the indoor environment generates noise, and the noise pollution of the indoor environment is caused. In order to reduce noise pollution, the prior art air conditioner adopts a certain noise control strategy when in operation. Chinese patent application No. CN106556122a discloses a sleep control method for an air conditioner, which reduces noise by reducing wind speed when indoor noise exceeds a standard. In the process of reducing the wind speed, the set temperature is adjusted to provide a comfortable sleeping environment in order to ensure that the refrigerating capacity is not changed.

Although the air conditioner in the prior art achieves the purposes of reducing noise and improving comfort by adjusting the operating parameters such as the wind speed, the set temperature and the like, the scheme in the prior art is only suitable for one-driving-one air conditioner, and the air conditioner is difficult to have better regulation and control for a multi-split air conditioner.

Disclosure of Invention

The invention aims to provide a noise control method of a multi-split air conditioner, which is used for executing air conditioner control based on the indoor unit state of the multi-split air conditioner and improving the overall performance of the air conditioner.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

a noise control method for a multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, and the method comprises the following steps:

when the air conditioner operates in a refrigerating mode, acquiring real-time noise values of indoor environments where the selected indoor units are located and real-time starting loads of all the indoor units;

when the real-time noise value is larger than the real-time noise threshold value, executing the following noise reduction control:

when the real-time starting load is larger than the set starting load, at least controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state to reduce the noise generated by the selected indoor unit;

and when the real-time starting load is not greater than the set starting load, keeping the operation parameters of the other indoor units in the operation state unchanged, and at least controlling the operation parameters of the selected indoor unit to reduce the noise generated by the selected indoor unit.

In one preferred embodiment, when the real-time startup load is not greater than the set startup load, at least controlling the operation parameters of the selected indoor unit includes:

acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as an initial rotating speed;

controlling the fan rotating speed of the selected indoor unit to start to reduce from the initial rotating speed;

acquiring the real-time deceleration variation of the fan rotating speed of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known deceleration variation and the parameter control strategy;

and controlling the operation parameters of the selected indoor unit according to the real-time operation parameter control strategy.

In one preferred embodiment, the correspondence between the deceleration variation amount and the parameter control strategy includes:

the deceleration variation is not more than a first set variation, and the parameter control strategy is a first control strategy;

the deceleration variation is larger than the first set variation and not larger than a second set variation, and the parameter control strategy is a second control strategy; the second set variation is larger than the first set variation;

the first control strategy comprises:

continuing to reduce the rotating speed of a fan of the indoor unit until the speed reduction variation reaches the first set variation;

the second control strategy comprises:

acquiring a first temperature difference of air outlets of the indoor unit before and after the speed is reduced;

when the first temperature difference is not larger than a first temperature difference threshold value, keeping the target superheat degree of the indoor unit unchanged;

and when the first temperature difference is larger than the first temperature difference threshold value, reducing the target superheat degree, and controlling the air outlet angle of the indoor unit to be a first set angle.

In one preferred embodiment, when the real-time startup load is not greater than the set startup load, the method further comprises the step of controlling a parameter of the refrigerant cycle system;

the corresponding relation between the deceleration variation and the parameter control strategy further comprises:

the deceleration variation is larger than the second set variation, and the parameter control strategy is a third control strategy;

the third control strategy comprises:

acquiring a second temperature difference of the air outlets of the indoor units before and after the speed reduction;

when the second temperature difference is not larger than a second temperature difference threshold value, reducing the target superheat degree;

when the second temperature difference is larger than the second temperature difference threshold value, reducing the target superheat degree, controlling the air outlet angle to be the first set angle, reducing the target low pressure, and opening a subcooler bypass valve in the refrigerant circulating system;

the second temperature difference threshold is less than the first temperature difference threshold.

In one preferred embodiment, the third control strategy further comprises:

determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening of the bypass valve of the subcooler according to the target supercooling degree;

determining the target supercooling degree according to the real-time outdoor environment temperature, which specifically comprises the following steps:

when the real-time outdoor environment temperature is not greater than a first ring temperature threshold value, the target supercooling degree is a first target value;

when the real-time outdoor environment is not less than a second loop temperature threshold value, the target supercooling degree is a second target value;

when the real-time outdoor environment temperature is greater than the first loop temperature threshold and less than the second loop temperature threshold, the target supercooling degree is between the first target value and the second target value;

the second loop temperature threshold is greater than the first loop temperature threshold, and the second target value is greater than the first target value.

In one preferred embodiment, when the real-time startup load is greater than the set startup load, controlling at least the operation parameters of the selected indoor unit and the operation parameters of other indoor units in an operating state specifically includes:

acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as an initial rotating speed;

controlling the rotating speed of the fan of the selected indoor unit to start to reduce from the initial rotating speed;

acquiring the real-time deceleration variation of the fan rotating speed of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known deceleration variation and the parameter control strategy;

and controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state according to the real-time operation parameter control strategy.

In one preferred embodiment, the correspondence between the deceleration variation amount and the parameter control strategy includes:

the deceleration variation is not more than a third set variation, and the parameter control strategy is a fourth control strategy;

the deceleration variation is larger than the third set variation and not larger than a fourth set variation, and the parameter control strategy is a fifth control strategy; the fourth set variation is larger than the third set variation;

the fourth control strategy comprises:

continuing to reduce the rotating speed of the fan of the selected indoor unit until the speed reduction variation reaches the third set variation;

the fifth control strategy comprises:

acquiring a third temperature difference of the air outlets of the indoor unit before and after the speed is reduced;

when the third temperature difference is not larger than a third temperature difference threshold value, keeping the target superheat degree of all indoor units unchanged;

and when the third temperature difference is larger than the third temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in the running state, and controlling the air outlet angle of the selected indoor unit to be a second set angle.

In one preferred embodiment, when the real-time startup load is greater than the set startup load, the method further comprises the step of controlling parameters of the refrigerant cycle system;

the corresponding relation between the deceleration variation and the parameter control strategy further comprises:

the deceleration variation is larger than the fourth set variation, and the parameter control strategy is a sixth control strategy;

the sixth control strategy comprises:

acquiring a fourth temperature difference of air outlets of the indoor unit before and after the speed is reduced;

when the fourth temperature difference is not larger than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit;

when the fourth temperature difference is larger than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in a running state, controlling the air outlet angle of the selected indoor unit to be the second set angle, reducing the target low pressure, and opening a subcooler bypass valve in a refrigerant circulating system;

the fourth temperature difference threshold is less than the third temperature difference threshold.

In one preferred embodiment, the sixth control strategy further includes:

determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening of the bypass valve of the subcooler according to the target supercooling degree;

determining the target supercooling degree according to the real-time outdoor environment temperature, which specifically comprises the following steps:

when the real-time outdoor environment temperature is not more than a third ring temperature threshold value, the target supercooling degree is a third target value;

when the real-time outdoor environment is not less than a fourth loop temperature threshold value, the target supercooling degree is a fourth target value;

when the real-time outdoor environment temperature is greater than the third loop temperature threshold and less than the fourth loop temperature threshold, the target supercooling degree is between the third target value and the fourth target value;

the fourth loop temperature threshold is greater than the third loop temperature threshold, and the fourth target value is greater than the third target value.

In one preferred embodiment, the real-time noise threshold is a dynamically variable value and is determined by:

and acquiring real-time and the type of the room where the selected indoor unit is located, and determining the real-time noise threshold according to the real-time, the type of the room where the selected indoor unit is located, the known time and the corresponding relation between the room type and the noise threshold.

Compared with the prior art, the invention has the advantages and positive effects that: according to the noise control method of the multi-split air conditioner, when the air conditioner operates in a refrigerating mode, a corresponding control strategy is executed based on the real-time noise value of an indoor environment and the starting load state of an indoor unit, indoor noise is reduced, and meanwhile the refrigerating requirement is met as far as possible; moreover, the control of difference noise reduction can be realized, the problem that the noise reduction and air conditioning effects are difficult to be considered when the same control is executed under different starting loads of the indoor units is solved, the balance between the noise reduction performance and the air conditioning performance is facilitated, and the overall operation performance of the air conditioner is improved.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a noise control method of a multi-split air conditioner according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a noise control method for a multi-split air conditioner according to an embodiment of the present invention in a power-on load state;

FIG. 3 is a flowchart illustrating another exemplary embodiment of a noise control method for a multi-split air conditioner according to the present invention under a startup load condition;

FIG. 4 is a flowchart illustrating an embodiment of a noise control method for a multi-split air conditioner according to the present invention in another on-load state;

fig. 5 is a flowchart illustrating another exemplary embodiment of a noise control method for a multi-split air conditioner according to the present invention in another on-load state.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.

Technical solutions between the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a technical solution combination is considered to be absent and is not within the protection scope of the present invention.

Fig. 1 is a flowchart illustrating a noise control method of a multi-split air conditioner according to an embodiment of the present invention. The multi-split air conditioner of this embodiment has an outdoor unit and a plurality of indoor units, and the plurality of indoor units are respectively disposed in different indoor environments and connected to the outdoor unit in parallel in the entire refrigerant cycle system, thereby constituting a multi-split air conditioner.

As shown in fig. 1, the embodiment implements noise reduction control on a selected indoor unit by the following procedure:

step 10: when the air conditioner operates in a refrigerating mode, the real-time noise value of the indoor environment where the selected indoor unit is located and the real-time starting loads of all the indoor units are obtained.

The selected indoor unit is an indoor unit that is to perform noise control. The real-time noise value of the indoor environment refers to the noise value of the indoor environment where the indoor unit is located, which is acquired in real time according to the known sampling frequency in the refrigerating operation process of the air conditioner. In order to accurately reflect the noise condition of the indoor environment caused by the operation of the indoor unit and avoid the interference of the noise generated by the operation of the indoor unit on the detection result, the environmental sound within a certain range away from the indoor unit is preferably collected to be used as a real-time noise value. During specific implementation, the noise acquisition equipment can be arranged at a certain distance from the air outlet of the indoor unit, the noise acquisition equipment is connected with the control panel of the air conditioner, and the noise acquisition equipment transmits acquired real-time noise information to the control panel, so that a real-time noise value reflecting the indoor environment noise condition of the selected indoor unit is obtained.

The real-time starting load of the indoor unit is determined in real time according to the known sampling frequency. The specific calculation method may be: and defining the sum of the rated cooling capacities of all indoor units in the on state in all indoor units connected with the outdoor unit as Q1, and defining the sum of the rated cooling capacities of all indoor units connected with the outdoor unit as Q2, wherein the on load is X = Q1/Q2.

Step 20: and executing noise reduction control when the real-time noise value is larger than the real-time noise threshold value.

The real-time noise threshold is a determinable value and is a threshold reflecting whether the indoor environment noise exceeds the standard or not. The real-time noise threshold may be a fixed value. In other preferred embodiments, the real-time noise threshold is a dynamically variable value. And, determining a real-time noise threshold using the following method:

in the process of executing the noise control of the air conditioner, the real-time and the type of the room where the selected indoor unit is located are obtained. And then, determining a real-time noise threshold value according to the real-time, the type of the room where the selected indoor unit is located, the known time and the corresponding relation between the room type and the noise threshold value. Wherein the correspondence of time and room type to noise threshold is known and preset in the air conditioner memory and/or controller. Specifically, the corresponding relation can be determined based on the living environment noise emission standard in the prior art so as to meet the adaptability and acceptability of people to the indoor environment noise.

If the real-time noise value is larger than the real-time noise threshold value, the noise of the indoor environment where the selected indoor unit is located exceeds the standard, noise reduction control is performed on the selected indoor unit, and therefore noise pollution to the environment caused by the working of the indoor unit is reduced.

Moreover, in the multi-split air conditioner, the on operation of other indoor units may affect the refrigerant cycle system, thereby affecting the cooling effect of the selected indoor unit. Therefore, the embodiment implements different noise reduction control strategies in step 30 and step 40 based on the real-time boot load.

Step 30: when the real-time starting load is not larger than the set starting load, the operation parameters of other indoor units in the operation state are kept unchanged, and at least the operation parameters of the selected indoor unit are controlled to reduce the noise generated by the selected indoor unit.

And setting the starting load to be a preset known value, wherein the preset known value is a starting load threshold value reflecting the influence degree on the operation effect or the performance of the selected indoor unit. In some preferred embodiments, the boot load is set to 50%.

When the real-time startup load is not greater than the set startup load, the influence of other indoor units on the selected indoor unit is small. In this case, the operating parameters of the selected indoor unit are controlled while keeping the operating parameters of the other indoor units in the operating state unchanged, or the operating parameters of the selected indoor unit and the refrigerant cycle system parameters are controlled, thereby reducing noise generated by the selected indoor unit.

Step 40: when the real-time starting load is larger than the set starting load, at least the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state are controlled, and the noise generated by the selected indoor unit is reduced.

When the real-time startup load is greater than the set startup load, the influence of other indoor units on the selected indoor unit is greater. In this case, the operating parameters of the selected indoor unit and the operating parameters of the other indoor units in the operating state are controlled, or the operating parameters of the selected indoor unit, the operating parameters of the other indoor units in the operating state, and the refrigerant cycle system parameters are controlled, so that noise generated by the selected indoor unit is reduced.

In the embodiment, when the air conditioner operates in a refrigerating mode, a corresponding control strategy is executed based on the real-time noise value of the indoor environment and the starting load state of the indoor unit, and the refrigerating requirement is conveniently met as far as possible while indoor noise is reduced by reasonably selecting the control strategy; moreover, the control of difference noise reduction can be realized, the problem that the noise reduction and air conditioning effects are difficult to be considered when the same control is executed under different starting loads of the indoor units is solved, the balance between the noise reduction performance and the air conditioning performance is facilitated, and the overall operation performance of the air conditioner is improved.

Fig. 2 is a flowchart illustrating an embodiment of a noise control method for a multi-split air conditioner under a startup load state, and more particularly, an embodiment of the method when a real-time startup load is not greater than a set startup load.

As shown in fig. 2, this embodiment implements noise reduction control for a selected indoor unit by the following procedure:

step 31: and acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as the initial rotating speed, and controlling the rotating speed of the fan of the selected indoor unit to reduce the speed from the initial rotating speed.

The noise generated by the operation of the fan of the indoor unit is a main source of the indoor environmental noise, and therefore, in the embodiment, the purpose of reducing the noise is achieved by reducing the rotating speed of the fan of the indoor unit. Then, the rotational speed at which the noise reduction control is to be executed and the speed has not been reduced is set as the initial rotational speed, and the speed reduction is started from the initial rotational speed.

Step 32: and acquiring the real-time speed reduction variation of the rotating speed of the fan of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known speed reduction variation and the parameter control strategy.

In the embodiment, the mode of gradually reducing the rotating speed and executing different control strategies under different rotating speed variation amounts is adopted, so that the refrigerating effect and the operating stability of the refrigerating system are prevented from being influenced by sudden change or overlarge variation of the rotating speed. Specifically, in the noise reduction control process, a real-time rotating speed value is obtained according to a set frequency, and a real-time speed reduction variation is determined according to an initial rotating speed and the real-time rotating speed value. The corresponding relation between the deceleration variation and the parameter control strategy is also preset, and the corresponding relation at least comprises the relation between the deceleration variation and the selected indoor unit operation parameter. Then, a real-time operation parameter control strategy is determined based on the real-time deceleration variation amount.

Step 33: and controlling the operation parameters of the selected indoor unit according to the real-time operation parameter control strategy.

In other preferred embodiments, the correspondence between the amount of deceleration variation and the parameter control strategy further comprises a correspondence between the amount of deceleration variation and a parameter of the refrigerant cycle system. Correspondingly, when the real-time starting load is not more than the set starting load, the operating parameters of the selected indoor unit are controlled, and the parameters of the refrigerant circulating system are also controlled, so that the aim of balancing the noise reduction effect and the air conditioning effect is further fulfilled. The specific control process is described with reference to the embodiment of fig. 3.

Fig. 3 is a flowchart illustrating another embodiment of the noise control method for a multi-split air conditioner according to the present invention in an on-load state, and more particularly, to a flowchart illustrating an embodiment of controlling both selected indoor unit operation parameters and refrigerant cycle system parameters.

As shown in fig. 3, this embodiment implements noise reduction control by the following procedure:

step 321: and acquiring real-time deceleration variation.

As described above, the real-time deceleration variation amount is determined according to the initial rotation speed and the real-time rotation speed value. In practical application, the deceleration variation amount may be a rotation speed reduction value, a rotation speed reduction rate, a rotation speed reduction gear, and the like, and may be defined according to specific application.

As a preferred embodiment, the deceleration variation amount is a rotation speed reduction step in order to simplify the process. In this embodiment, two set amounts of a first set fluctuation amount and a second set fluctuation amount, which is larger than the first set fluctuation amount, are preset. For example, the first setting variation is to be decreased by one step, and the second setting variation is to be decreased by two steps. After the real-time noise reduction variation is obtained, the real-time noise reduction variation is compared with the first set variation and the second set variation, different control strategies are obtained according to the comparison result, and different noise reduction control is carried out.

Step 322: and judging whether the real-time deceleration variation is larger than a first set variation. If yes, go to step 324; otherwise, step 323 is performed.

Step 323: real-time parameters are determined according to a first control strategy. Then, step 327 is performed.

In this embodiment, the first control strategy is to continue to reduce the fan speed of the indoor unit until the reduction variation reaches the first set variation. Correspondingly, the determined real-time parameters are used for reducing the rotating speed of the fan of the selected indoor unit until the speed reduction variation reaches a first set variation so as to improve the noise reduction effect.

Step 324: and judging whether the real-time deceleration variation is larger than a second set variation. If yes, go to step 326; otherwise, step 325 is performed.

After determining that the real-time rotational speed variation is greater than the first set variation in step 322, it is further determined whether the real-time rotational speed variation is greater than the second set variation, and different control is performed according to the determination result.

Step 325: and determining real-time parameters according to the second control strategy. Then, step 327 is performed.

If the real-time variation of the rotating speed is larger than the first set variation and is not larger than the second set variation, the corresponding parameter control strategy is the second control strategy under the condition.

The second control strategy includes:

acquiring a first temperature difference of air outlets of the indoor unit before and after the speed is reduced;

when the first temperature difference is not larger than the first temperature difference threshold value, keeping the target superheat degree of the indoor unit unchanged;

when the first temperature difference is larger than the first temperature difference threshold value, the target superheat degree is reduced, and the air outlet angle of the indoor unit is controlled to be a first set angle.

The first temperature difference is a temperature difference obtained in real time, and is a difference between the temperature of the air outlet of the indoor unit obtained in real time after the speed reduction and the temperature of the air outlet of the indoor unit obtained before the speed reduction. The temperature of the air outlet of the indoor unit can be acquired by arranging a temperature acquisition device at the air outlet. The first temperature difference threshold value is a preset value, for example, -2 ℃. The first set angle is a preset value, for example, 45 °, at which the cold air blown out of the outlet of the indoor unit can be fed into the room with maximum cooling efficiency.

If the temperature difference between the air outlets of the indoor unit before and after the speed reduction is not greater than the first temperature difference threshold value, the influence of the speed reduction on the indoor refrigeration effect is small; under the condition, the target superheat degree of the indoor unit is kept unchanged, and the running stability of the whole air conditioner is kept. If the temperature difference between the air outlets of the indoor unit before and after the speed reduction is greater than a first temperature difference threshold value, the speed reduction has great influence on the indoor refrigeration effect; under the condition, the target superheat degree of the selected indoor unit is reduced to increase the opening degree of the electronic expansion valve of the selected indoor unit, increase the quantity of the refrigerant entering the selected indoor unit and compensate the influence on the refrigeration effect due to the reduction of the rotating speed; meanwhile, the air outlet angle of the indoor unit is controlled to be kept at the first set angle, and the refrigeration effect is improved.

Step 326: and determining real-time parameters according to a third control strategy. Then, step 328 is performed.

If the real-time rotational speed variation is greater than the second predetermined variation and the rotational speed drop is greater in step 324, a third control strategy is employed to determine the real-time parameters.

The third control strategy includes:

acquiring a second temperature difference of the air outlets of the indoor unit before and after the speed is reduced;

when the second temperature difference is not larger than the second temperature difference threshold value, reducing the target superheat degree;

when the second temperature difference is larger than the second temperature difference threshold value, the target superheat degree is reduced, the air outlet angle is controlled to be a first set angle, the target low pressure is reduced, and a subcooler bypass valve in the refrigerant circulating system is opened. The specific location of the subcooler bypass valve in the refrigerant cycle system is prior art and will not be described in detail herein.

The meaning and the obtaining mode of the second temperature difference are the same as those of the first temperature difference, and the second temperature difference is distinguished from the first temperature difference and defined as the second temperature difference. The second temperature difference threshold is also a preset value and is smaller than the first temperature difference threshold. The purpose of setting the second temperature difference threshold value to be smaller than the first temperature difference threshold value is as follows: the larger the wind speed of the indoor unit is reduced, the poorer the refrigerating capacity is, and the regulation and control of the refrigerating capacity need to be executed.

If the temperature difference between the air outlets of the indoor units before and after the speed reduction is not larger than the second temperature difference threshold value, only the target superheat degree of the selected indoor unit is further reduced, the amount of the refrigerant entering the selected indoor unit is increased, and the influence on the refrigeration effect due to the reduction of the rotating speed is compensated. If the temperature difference between the air outlets of the indoor units before and after the speed reduction is larger than the second temperature difference threshold value, the speed reduction has larger influence on the indoor refrigeration effect, at the moment, the target superheat degree of the selected indoor unit is reduced, the air outlet angle of the selected indoor unit is controlled, the control on the operation parameters of the selected indoor unit is realized, and the parameters of the refrigerant circulating system are also controlled. Specifically, the target low pressure is reduced to improve the running rotating speed of the compressor, increase the circulation of the refrigerant and further strengthen the refrigerating capacity of the selected indoor unit; meanwhile, a subcooler bypass valve in the refrigerant circulating system is opened, the supercooling degree of the refrigerant is increased, the refrigerating capacity of the refrigerant entering the selected indoor unit is further enhanced, and the compensation effect on the performance reduction of the refrigerating effect caused by the larger reduction of the rotating speed is improved.

In some other preferred embodiments, the third control strategy further comprises:

and determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening of the bypass valve of the subcooler according to the target supercooling degree so as to ensure that the refrigerant circulating system can stably and safely operate at different outdoor environment temperatures.

The method comprises the following steps of determining a target supercooling degree according to a real-time outdoor environment temperature, wherein the method specifically comprises the following steps:

when the real-time outdoor environment temperature is not greater than the first ring temperature threshold value, the target supercooling degree is a first target value;

when the real-time outdoor environment is not less than the second loop temperature threshold value, the target supercooling degree is a second target value;

when the real-time outdoor environment temperature is greater than the first loop temperature threshold and less than the second loop temperature threshold, the target supercooling degree is between the first target value and the second target value.

The second ring temperature threshold is larger than the first ring temperature threshold, and the second target value is larger than the first target value. Preferably, the first ring temperature threshold is 20 ℃, the second ring temperature threshold is 35 ℃, the first target value is 15 ℃, and the second target value is 30 ℃.

Step 327: and controlling and selecting the indoor unit according to the real-time parameters.

After determining the real-time parameters according to the first control strategy in step 323, or after determining the real-time parameters according to the second control strategy in step 325, controlling the selected indoor unit according to the real-time parameters, and executing the noise reduction control.

Step 328: and controlling the selected indoor unit and the refrigerant circulating system according to the real-time parameters.

Step 326 includes the operation parameters of the selected indoor unit and the control parameters of the refrigerant circulation system according to the real-time parameters determined by the third control strategy, and then the selected indoor unit and the refrigerant circulation system are controlled according to the real-time parameters, so that the noise reduction control of the selected indoor unit is realized.

It should be understood that, in the process of controlling the operation of the air conditioner according to the real-time parameter determined by a certain control strategy, the real-time noise value of the indoor environment where the selected indoor unit is located is still continuously obtained, and if the real-time noise value is not greater than the real-time noise threshold, the current control strategy is kept operating.

Fig. 4 is a flowchart illustrating an embodiment of a noise control method for a multi-split air conditioner according to the present invention in another startup load state, and more particularly, in a case where a real-time startup load is greater than a set startup load.

As shown in fig. 4, this embodiment implements noise reduction control for a selected indoor unit by the following procedure:

step 41: and acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as the initial rotating speed, and controlling the rotating speed of the fan of the selected indoor unit to reduce the speed from the initial rotating speed.

The noise generated by the operation of the fan of the indoor unit is the main source of the indoor environmental noise, so in this embodiment, the purpose of reducing the noise is achieved by reducing the rotating speed of the fan of the indoor unit. Then, the rotational speed at which the noise reduction control is to be executed and the speed has not been reduced is set as the initial rotational speed, and the speed reduction is started from the initial rotational speed.

Step 42: and acquiring the real-time speed reduction variation of the rotating speed of the fan of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known speed reduction variation and the parameter control strategy.

In the embodiment, the mode of gradually reducing the rotating speed and executing different control strategies under different rotating speed variation amounts is adopted, so that the refrigerating effect and the operating stability of the refrigerating system are prevented from being influenced by sudden change or overlarge variation of the rotating speed. Specifically, in the noise reduction control process, a real-time rotating speed value is obtained according to a set frequency, and a real-time speed reduction variation amount is determined according to an initial rotating speed and the real-time rotating speed value. The corresponding relationship between the deceleration variation and the parameter control strategy is also preset, and as described in the embodiment of fig. 1, when the startup load is greater than the set startup load, at least the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state are controlled, so that the corresponding relationship between the deceleration variation and the parameter control strategy at least includes the relationship between the deceleration variation and the operation parameters of the selected indoor unit and the relationship between the deceleration variation and the operation parameters of other indoor units in the operation state. Then, a real-time operation parameter control strategy is determined based on the real-time deceleration variation amount.

Step 43: and controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state according to the real-time operation parameter control strategy.

In other preferred embodiments, the correspondence between the amount of deceleration variation and the parameter control strategy further comprises a correspondence between the amount of deceleration variation and a parameter of the refrigerant cycle system. Correspondingly, when the real-time startup load is greater than the set startup load, the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state are controlled, and the parameters of the refrigerant circulation system are also controlled, so that the aims of balancing the noise reduction effect and the air conditioning effect are further fulfilled. The specific control process is described with reference to the embodiment of fig. 5.

Fig. 5 is a flowchart illustrating another embodiment of the noise control method for a multi-split air conditioner according to the present invention under another on-load condition, and more particularly, to a flowchart illustrating an embodiment of controlling the operating parameters of the selected indoor unit, the indoor units in other operating conditions, and the parameters of the refrigerant cycle system.

As shown in fig. 5, this embodiment implements noise reduction control by the following procedure:

step 421: and acquiring the real-time deceleration variation.

As described above, the real-time deceleration variation amount is determined according to the initial rotation speed and the real-time rotation speed value. In practical application, the deceleration variation amount may be a rotation speed reduction value, a rotation speed reduction rate, a rotation speed reduction gear, and the like, and may be defined according to specific application.

As a preferred embodiment, the deceleration variation amount is a rotation speed reduction step in order to simplify the process. In this embodiment, two set amounts of a third set fluctuation amount and a fourth set fluctuation amount are preset, and the fourth set fluctuation amount is larger than the third set fluctuation amount. The third setting variation may be the same as the first setting variation, and the fourth setting variation may be the same as the second setting variation; of course, they may or may not be identical. For example, the third setting variation is reduced by one shift, and the fourth setting variation is reduced by two shifts. After the real-time noise reduction variation is obtained, the real-time noise reduction variation is compared with the third set variation and the fourth set variation, different control strategies are obtained according to the comparison result, and different noise reduction control is executed.

Step 422: and judging whether the real-time deceleration variation is larger than a third set variation. If yes, go to step 424; otherwise, step 423 is performed.

Step 423: and determining real-time parameters according to a fourth control strategy. Then, step 427 is performed.

In this embodiment, the fourth control strategy is to continue to decrease the fan speed of the selected indoor unit until the variation in the decrease speed reaches the third set variation. Correspondingly, the determined real-time parameters are that the rotating speed of the fan of the selected indoor unit is reduced until the speed reduction variation reaches a third set variation, so that the noise reduction effect is improved.

Step 424: and judging whether the real-time deceleration variation is larger than a fourth set variation. If yes, go to step 426; otherwise, step 425 is performed.

After determining that the real-time variation of the rotational speed is greater than the third set variation in step 422, it is further determined whether the real-time variation of the rotational speed is greater than the fourth set variation, and different control is performed according to the determination result.

Step 425: and determining real-time parameters according to a fifth control strategy. Then, step 427 is performed.

If the real-time variation of the rotating speed is larger than the third set variation and is not larger than the fourth set variation, the corresponding parameter control strategy is the fifth control strategy under the condition.

The fifth control strategy includes:

acquiring a third temperature difference of the air outlets of the indoor unit before and after the speed is reduced;

when the third temperature difference is not greater than the third temperature difference threshold value, keeping the target superheat degree of all the indoor units unchanged;

and when the third temperature difference is larger than the third temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in the running state, and controlling the air outlet angle of the selected indoor unit to be a second set angle.

The meaning and the obtaining mode of the third temperature difference are the same as the first temperature difference and the second temperature difference. The third temperature difference threshold is also a preset value, for example, -2 ℃. The second set angle is a preset value, for example, 45 °, at which the cold air blown out of the outlet of the indoor unit can be fed into the room with maximum cooling efficiency.

If the temperature difference between the air outlets of the indoor unit before and after the speed reduction is not larger than a third temperature difference threshold value, the influence of the speed reduction on the indoor refrigeration effect is small; under the condition, the target superheat degree of all indoor units is kept unchanged, and the running stability of the whole air conditioner is kept. If the temperature difference between the air outlets of the indoor unit before and after the speed reduction is greater than a third temperature difference threshold value, the speed reduction has a large influence on the indoor refrigeration effect; under the condition, the target superheat degree of the selected indoor unit is reduced to increase the opening degree of the electronic expansion valve of the selected indoor unit, increase the quantity of the refrigerant entering the selected indoor unit and compensate the influence on the refrigeration effect due to the reduction of the rotating speed; the target superheat degree of other indoor units in the running state is increased, and the refrigerants entering the other indoor units are reduced so as to stabilize the running of the whole system, and more refrigerants can enter the selected indoor unit; meanwhile, the air outlet angle of the selected indoor unit is controlled to be kept at a second set angle, and the refrigeration effect is improved.

Step 426: and determining real-time parameters according to a sixth control strategy. Then, step 428 is performed.

If step 424 determines that the real-time rotational speed variation is greater than the fourth predetermined variation and the rotational speed drop is greater, a sixth control strategy is employed to determine the real-time parameters.

The sixth control strategy includes:

obtaining a fourth temperature difference of air outlets of the indoor unit before and after the speed reduction;

when the fourth temperature difference is not greater than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit;

and when the fourth temperature difference is greater than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in the running state, controlling the air outlet angle of the selected indoor unit to be a second set angle, reducing the target low pressure, and opening a subcooler bypass valve in the refrigerant circulating system. The specific location of the subcooler bypass valve in the refrigerant cycle system is prior art and will not be described in detail herein.

The meaning and the obtaining mode of the fourth temperature difference are the same as those of the third temperature difference, and the fourth temperature difference is defined as being distinguished from the third temperature difference. And the fourth temperature difference threshold value is also a preset value and is smaller than the third temperature difference threshold value. The purpose of setting the fourth temperature difference threshold value to be smaller than the third temperature difference threshold value is as follows: the larger the air speed of the indoor unit is reduced, the poorer the refrigerating capacity is, and the regulation and control of the refrigerating capacity are required.

If the temperature difference between the air outlets of the indoor units before and after the speed reduction is not larger than the fourth temperature difference threshold value, only the target superheat degree of the selected indoor unit is further reduced, the amount of the refrigerant entering the selected indoor unit is increased, and the influence on the refrigeration effect due to the reduction of the rotating speed is compensated. If the temperature difference between the air outlets of the indoor units before and after the speed reduction is greater than the fourth temperature difference threshold value, the speed reduction has a large influence on the indoor refrigeration effect, at the moment, the target superheat degree of the selected indoor unit is reduced, the air outlet angle of the selected indoor unit is controlled, the target superheat degree of other indoor units in the running state is increased, the running parameters of the selected indoor unit and other indoor units in the running state are controlled, and the parameters of the refrigerant circulating system are also controlled. Specifically, the target low pressure is reduced to improve the running rotating speed of the compressor, increase the circulation of the refrigerant and further strengthen the refrigerating capacity of the selected indoor unit; meanwhile, a subcooler bypass valve in the refrigerant circulating system is opened, the supercooling degree of the refrigerant is increased, the refrigerating capacity of the refrigerant entering the selected indoor unit is further enhanced, and the compensation effect on the performance reduction of the refrigerating effect caused by the larger reduction of the rotating speed is improved.

In some other preferred embodiments, the sixth control strategy further comprises:

and determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening of the bypass valve of the subcooler according to the target supercooling degree so as to ensure that the refrigerant circulating system can stably and safely operate at different outdoor environment temperatures.

The method for determining the target supercooling degree according to the real-time outdoor environment temperature specifically comprises the following steps:

when the real-time outdoor environment temperature is not greater than the first ring temperature threshold value, the target supercooling degree is a first target value;

when the real-time outdoor environment is not less than the second loop temperature threshold value, the target supercooling degree is a second target value;

when the real-time outdoor environment temperature is greater than the first loop temperature threshold and less than the second loop temperature threshold, the target supercooling degree is between the first target value and the second target value.

The second loop temperature threshold is larger than the first loop temperature threshold, and the second target value is larger than the first target value. Preferably, the first ring temperature threshold is 20 ℃, the second ring temperature threshold is 35 ℃, the first target value is 15 ℃, and the second target value is 30 ℃.

Step 427: and controlling the selected indoor unit and other indoor units in the running state according to the real-time parameters.

After determining the real-time parameters according to the fourth control strategy in step 423 or determining the real-time parameters according to the fifth control strategy in step 425, controlling the selected indoor unit and other indoor units in the operating state according to the real-time parameters, and executing the noise reduction control.

Step 428: and controlling the selected indoor unit, other indoor units in the running state and the refrigerant circulating system according to the real-time parameters.

Step 426, determining real-time parameters according to the sixth control strategy, including the operation parameters of the selected indoor unit, the operation parameters of the other indoor units in the operation state, and the control parameters of the refrigerant circulation system, and controlling the selected indoor unit, the other indoor units in the operation state, and the refrigerant circulation system according to the real-time parameters to realize the noise reduction control of the selected indoor unit.

It should be understood that, in the process of controlling the operation of the air conditioner according to the real-time parameter determined by a certain control strategy, the real-time noise value of the indoor environment where the selected indoor unit is located is still continuously obtained, and if the real-time noise value is not greater than the real-time noise threshold, the current control strategy is kept operating.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A noise control method for a multi-split air conditioner, which comprises an outdoor unit and a plurality of indoor units, is characterized by comprising the following steps:

when the air conditioner operates in a refrigerating mode, acquiring real-time noise values of indoor environments where the selected indoor units are located and real-time starting loads of all the indoor units;

when the real-time noise value is larger than the real-time noise threshold value, executing the following noise reduction control:

when the real-time starting load is larger than the set starting load, at least controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state to reduce the noise generated by the selected indoor unit;

and when the real-time starting load is not greater than the set starting load, keeping the operation parameters of the other indoor units in the operation state unchanged, and at least controlling the operation parameters of the selected indoor unit to reduce the noise generated by the selected indoor unit.

2. The noise control method of a multi-split air conditioner according to claim 1, wherein when the real-time startup load is not greater than the set startup load, at least controlling the operating parameters of the selected indoor unit comprises:

acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as an initial rotating speed;

controlling the rotating speed of the fan of the selected indoor unit to start to reduce from the initial rotating speed;

acquiring the real-time deceleration variation of the fan rotating speed of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known deceleration variation and the parameter control strategy;

and controlling the operation parameters of the selected indoor unit according to the real-time operation parameter control strategy.

3. The noise control method of a multi-split air conditioner as claimed in claim 2, wherein the correspondence relationship between the deceleration variation amount and the parameter control strategy includes:

the deceleration variation is not more than a first set variation, and the parameter control strategy is a first control strategy;

the deceleration variation is larger than the first set variation and not larger than a second set variation, and the parameter control strategy is a second control strategy; the second set variation is larger than the first set variation;

the first control strategy comprises:

continuing to reduce the rotating speed of a fan of the indoor unit until the speed reduction variation reaches the first set variation;

the second control strategy comprises:

acquiring a first temperature difference of air outlets of the indoor unit before and after the speed is reduced;

when the first temperature difference is not larger than a first temperature difference threshold value, keeping the target superheat degree of the indoor unit unchanged;

and when the first temperature difference is larger than the first temperature difference threshold value, reducing the target superheat degree, and controlling the air outlet angle of the indoor unit to be a first set angle.

4. The noise control method of a multi-split air conditioner as claimed in claim 3, further comprising a process of controlling a parameter of a refrigerant cycle system when the real-time startup load is not greater than the set startup load;

the corresponding relation between the deceleration variation and the parameter control strategy further comprises:

the deceleration variation is larger than the second set variation, and the parameter control strategy is a third control strategy;

the third control strategy comprises:

acquiring a second temperature difference of the air outlets of the indoor unit before and after the speed is reduced;

when the second temperature difference is not larger than a second temperature difference threshold value, reducing the target superheat degree;

when the second temperature difference is larger than the second temperature difference threshold value, reducing the target superheat degree, controlling the air outlet angle to be the first set angle, reducing the target low pressure, and opening a subcooler bypass valve in the refrigerant circulating system;

the second temperature difference threshold is less than the first temperature difference threshold.

5. The noise control method of a multi-split air conditioner as set forth in claim 4, wherein said third control strategy further comprises:

determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening of the bypass valve of the subcooler according to the target supercooling degree;

determining the target supercooling degree according to the real-time outdoor environment temperature, which specifically comprises the following steps:

when the real-time outdoor environment temperature is not greater than a first ring temperature threshold value, the target supercooling degree is a first target value;

when the real-time outdoor environment is not less than a second loop temperature threshold value, the target supercooling degree is a second target value;

when the real-time outdoor environment temperature is greater than the first loop temperature threshold and less than the second loop temperature threshold, the target supercooling degree is between the first target value and the second target value;

the second ring temperature threshold is greater than the first ring temperature threshold, and the second target value is greater than the first target value.

6. The noise control method of a multi-split air conditioner according to claim 1, wherein when the real-time startup load is greater than the set startup load, at least the operation parameters of the selected indoor unit and the operation parameters of other indoor units in an operating state are controlled, specifically including:

acquiring the rotating speed of the fan of the selected indoor unit when the rotating speed is not reduced as an initial rotating speed;

controlling the rotating speed of the fan of the selected indoor unit to start to reduce from the initial rotating speed;

acquiring the real-time deceleration variation of the fan rotating speed of the selected indoor unit, and determining a real-time operation parameter control strategy according to the corresponding relation between the known deceleration variation and the parameter control strategy;

and controlling the operation parameters of the selected indoor unit and the operation parameters of other indoor units in the operation state according to the real-time operation parameter control strategy.

7. The noise control method of a multi-split air conditioner as claimed in claim 6, wherein the correspondence relationship between the deceleration variation amount and the parameter control strategy includes:

the deceleration variation is not more than a third set variation, and the parameter control strategy is a fourth control strategy;

the deceleration variation is larger than the third set variation and not larger than a fourth set variation, and the parameter control strategy is a fifth control strategy; the fourth set variation is larger than the third set variation;

the fourth control strategy comprises:

continuing to reduce the rotating speed of the fan of the selected indoor unit until the speed reduction variation reaches the third set variation;

the fifth control strategy comprises:

acquiring a third temperature difference of air outlets of the indoor unit before and after the speed reduction;

when the third temperature difference is not larger than a third temperature difference threshold value, keeping the target superheat degree of all indoor units unchanged;

and when the third temperature difference is larger than the third temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in the running state, and controlling the air outlet angle of the selected indoor unit to be a second set angle.

8. The noise control method of a multi-split air conditioner as claimed in claim 7, further comprising a process of controlling a parameter of a refrigerant cycle system when the real-time startup load is greater than the set startup load;

the corresponding relation between the deceleration variation and the parameter control strategy further comprises:

the deceleration variation is larger than the fourth set variation, and the parameter control strategy is a sixth control strategy;

the sixth control strategy comprises:

acquiring a fourth temperature difference of air outlets of the indoor unit before and after the speed is reduced;

when the fourth temperature difference is not larger than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit;

when the fourth temperature difference is larger than the fourth temperature difference threshold value, reducing the target superheat degree of the selected indoor unit, increasing the target superheat degree of other indoor units in the running state, controlling the air outlet angle of the selected indoor unit to be the second set angle, reducing the target low pressure, and opening a subcooler bypass valve in a refrigerant circulating system;

the fourth temperature difference threshold is less than the third temperature difference threshold.

9. The noise control method of a multi-split air conditioner as set forth in claim 8, wherein the sixth control strategy further comprises:

determining a target supercooling degree according to the real-time outdoor environment temperature, and controlling the opening degree of the subcooler bypass valve according to the target supercooling degree;

determining the target supercooling degree according to the real-time outdoor environment temperature, which specifically comprises the following steps:

when the real-time outdoor environment temperature is not more than a third loop temperature threshold value, the target supercooling degree is a third target value;

when the real-time outdoor environment is not less than a fourth loop temperature threshold value, the target supercooling degree is a fourth target value;

when the real-time outdoor environment temperature is greater than the third loop temperature threshold and less than the fourth loop temperature threshold, the target supercooling degree is between the third target value and the fourth target value;

the fourth loop temperature threshold is greater than the third loop temperature threshold, and the fourth target value is greater than the third target value.

10. The noise control method of a multi-split air conditioner according to any one of claims 1 to 9, wherein the real-time noise threshold value is a dynamically variable value and is determined by a method comprising:

and acquiring real-time and the type of the room where the selected indoor unit is located, and determining the real-time noise threshold according to the real-time, the type of the room where the selected indoor unit is located, the known time and the corresponding relation between the room type and the noise threshold.

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