WO2021103542A1

WO2021103542A1 - Air conditioner starting frequency determining method and system

Info

Publication number: WO2021103542A1
Application number: PCT/CN2020/100513
Authority: WO
Inventors: 宋德跃; 张铭; 高强; 孙猛猛; 张晓迪
Original assignee: 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2019-11-26
Filing date: 2020-07-07
Publication date: 2021-06-03
Also published as: EP4067763A4; EP4067763A1; CN112944509A

Abstract

An air conditioner starting frequency determining method and system. The method comprises: comparing an acquired actual temperature value of the outdoor environment with preset first and second temperature thresholds, and determining the starting frequency of an air conditioner on the basis of the comparison result. The starting frequency of the air conditioner can be adjusted according to the actual temperature value of the outdoor environment, so that the air conditioner can be turned on normally without failure even when the outdoor temperature is high.

Description

Method and system for determining starting frequency of air conditioner

Technical field

The invention relates to the technical field of air conditioners, in particular to a method and system for determining the starting frequency of an air conditioner.

Background technique

When the air conditioning system is in refrigeration mode, the refrigerant passes from the compressor to the outdoor unit condenser through the four-way valve. After the throttling effect of the outdoor unit electronic expansion valve, it enters the indoor side and enters the evaporator through the throttling effect of the indoor unit electronic expansion valve. After heat exchange, it enters the outdoor side, passes through the four-way valve again, flows into the gas-liquid separator, and finally flows back to the compressor to form a complete refrigeration cycle.

In general, in order to allow the refrigerant in the air conditioning system to circulate quickly to participate in the cooling or heating of the air conditioning, during the soft start phase, the compressor generally starts at the maximum starting frequency. However, when the air-conditioning system is refrigerating, when the outdoor environment temperature is high, especially in the T3 working condition, the outdoor environment temperature can reach 40-50℃. At this time, because the condenser has a limited condensation effect, if the starting frequency is relatively high, If it is high, the discharge pressure of the compressor will be too high, which will easily cause the high-pressure pressure switch to be disconnected to protect the air conditioner from shutdown, resulting in the problem that the air-conditioning system cannot be started normally and affecting the normal use of users.

Correspondingly, a new method and system for determining the starting frequency of an air conditioner is needed in the art to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem of the existing air-conditioning system that the air-conditioning system cannot be turned on normally when the outdoor environment temperature is high, the present invention provides a method for determining the starting frequency of the air-conditioning system. And the system, so that the air conditioner can be turned on normally even when the outdoor temperature is high and will not malfunction.

The method for determining the start frequency of an air conditioner provided by the present invention includes: obtaining an actual temperature value of an outdoor environment; comparing the actual temperature value with a preset first temperature threshold and a second temperature threshold, and the first A temperature threshold is less than the second temperature threshold; the starting frequency of the air conditioner is determined based on the result of the comparison.

As a preferred technical solution of the method for determining the starting frequency of the air conditioner provided by the present invention, the determining the starting frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is less than or equal to the first temperature threshold, Then the starting frequency of the air conditioner is determined as the first starting frequency.

As a preferred technical solution of the method for determining the start frequency of the air conditioner provided by the present invention, the determining the start frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is between the first temperature threshold and the first temperature threshold. When the temperature is between the second temperature thresholds, the starting frequency of the air conditioner is determined according to the functional relationship of the preset starting frequency with the actual temperature value.

As a preferred technical solution of the method for determining the start frequency of the air conditioner provided by the present invention, the functional relationship is used to characterize the general trend that the start frequency decreases with the increase of the actual temperature value.

As a preferred technical solution of the method for determining the start frequency of the air conditioner provided by the present invention, the determining the start frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is greater than or equal to the second temperature threshold, Then the starting frequency of the air conditioner is determined to be zero.

In addition, the present invention correspondingly provides a system for determining the start frequency of an air conditioner, which includes: an acquisition module, the acquisition module is used to acquire the actual temperature value of the outdoor environment; a comparison module, the comparison module is used to compare the The actual temperature value is compared with a preset first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold; a determining module, the determining module is configured to determine the air conditioner based on the result of the comparison Start frequency.

As a preferred technical solution of the system for determining the start frequency of the air conditioner provided by the present invention, the determination module determines the start frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is less than or equal to the The first temperature threshold determines the starting frequency of the air conditioner as the first starting frequency.

As a preferred technical solution of the system for determining the starting frequency of the air conditioner provided by the present invention, the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is between the first When a temperature threshold is between a temperature threshold and the second temperature threshold, the startup frequency of the air conditioner is determined according to a preset functional relationship between the startup frequency and the actual temperature value.

As a preferred technical solution of the system for determining the start frequency of the air conditioner provided by the present invention, the functional relationship is used to characterize the general trend that the start frequency decreases with the increase of the actual temperature value.

As a preferred technical solution of the system for determining the starting frequency of the air conditioner provided by the present invention, the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is greater than or equal to the For the second temperature threshold, the starting frequency of the air conditioner is determined to be zero.

The invention provides a method and system for determining the start frequency of an air conditioner, which compares the acquired actual temperature value of the outdoor environment with a preset first temperature threshold and a second temperature threshold, and determines the air conditioner based on the result of the comparison. Start frequency. In this way, according to the actual temperature values of different outdoor environments, the starting frequency of the air conditioner is determined separately, so that the air conditioner can be turned on normally without failure when the outdoor temperature is high, and the performance of the air conditioner is further optimized and improved Improve the user experience.

Further, in the method and system for determining the starting frequency of an air conditioner provided by the present invention, when the actual temperature value of the outdoor environment is between the first temperature threshold and the second temperature threshold, the starting frequency varies according to the preset starting frequency. The functional relationship of the actual temperature value changes determines the starting frequency of the air conditioner, and the functional relationship is used to characterize the general trend of the starting frequency decreasing with the increase of the actual temperature value. In this way, when the actual temperature value of the outdoor environment exceeds the first temperature threshold, as the actual temperature value of the outdoor environment increases, it can still be ensured that the air conditioner is started quickly at the highest possible frequency.

Description of the drawings

The method and system for determining the starting frequency of the air conditioner of the present invention will be described below with reference to the accompanying drawings. In the attached picture:

FIG. 1 is a schematic flowchart of a method for determining the start frequency of an air conditioner according to this embodiment;

FIG. 2 is a first function image of the method for determining the start frequency of the air conditioner in this embodiment;

FIG. 3 is a second function image of the method for determining the starting frequency of the air conditioner in this embodiment;

Figure 4 is a schematic structural diagram of the air conditioning system of this embodiment.

List of reference signs

1- Compressor; 2- High pressure sensor; 3- High pressure switch; 4- Four-way valve; 5- Condenser; 6-Outdoor electronic expansion valve; 7- Indoor electronic expansion valve; 8- Evaporator; 9- Low pressure Pressure sensor; 10-gas-liquid separator.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention. For example, although this embodiment is described in conjunction with the air conditioning system shown in FIG. 4, it is not intended to limit the scope of protection of the present invention. Those skilled in the art can apply the present invention without departing from the principle of the present invention. For air conditioning systems with other structures.

As shown in Figure 4, when the air-conditioning system is in the cooling mode, the d-end and c-end of the four-way valve are connected, and the e-end and s-end are connected, and the refrigerant from the compressor 1 passes through the four-way valve 4. Reach the outdoor unit condenser 5, after the throttling effect of the outdoor unit electronic expansion valve 6, enter the indoor side, pass the throttling effect of the indoor unit electronic expansion valve 7, enter the evaporator 8 for heat exchange, and then enter the outdoor side, again After passing through the four-way valve 4, it flows into the gas-liquid separator 10, and finally flows back to the compressor 1 to complete a complete refrigeration cycle. Among them, a high-pressure pressure sensor 2 and a high-pressure pressure switch 3 are further arranged between the compressor 1 and the four-way valve, and a low-pressure pressure sensor 9 is also connected to the refrigerant inlet side of the gas-liquid separator 10.

In general, in order to allow the refrigerant in the air-conditioning system to circulate quickly to participate in the cooling or heating of the air-conditioning, the frequency of compressor 1 in the soft-start phase is generally set to be relatively high and a fixed value (such as 40Hz). When the outdoor environment temperature is relatively high, due to the limited condensation effect of the condenser 5, if the start frequency is still used at 40Hz at this time, the discharge pressure of the compressor 1 detected by the high pressure pressure sensor 2 will be too high. It is easy to cause the high-pressure pressure switch 3 to be disconnected and cause the air conditioning system to enter shutdown protection.

Taking R410A refrigerant as an example, the high-pressure pressure switch cut-off value is generally 4.15MPa, and the corresponding saturation temperature is 64.7°C. When the outdoor environment temperature is high, the pressure of the refrigerant in the air conditioning system will increase accordingly.

Generally speaking, air conditioners are generally divided into three types: cold air type, heat pump type, electric heating type and so on. In different climate types, the applicable ambient temperature range is different. According to the national standard GB/T7725-1996 "Room Air Conditioner", the climate types are divided into three categories, namely T1, T2, and T3. T3 climate type air conditioners have a maximum working environment temperature of 52°C, which can adapt to tropical climates, so they are called tropical type air conditioners; T2 climate type air conditioners are called frigid zone type air conditioners; T1 climate type air conditioners are called temperate zone type air conditioners.

Take an air conditioner with a climate type of T3 as an example. When the specified maximum operating outdoor ambient temperature of the air conditioner is 52°C, the corresponding system pressure is 3.2MPa. If the compressor start frequency is set unreasonably at this time (for example, it is still 40Hz), the exhaust pressure 2 can easily reach 4.15MPa, which will trigger the high pressure switch 3 to open the fault, so that the empty system cannot start normally, affecting the normal use of users .

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of the existing air-conditioning system that the air-conditioning system cannot be started normally when the outdoor environment temperature is high, this embodiment provides a determination of the starting frequency of the air-conditioning system. Method and system, so that the air conditioner can be turned on normally even when the outdoor temperature is high, and will not malfunction.

As shown in FIG. 1, the method for determining the start frequency of an air conditioner provided in this embodiment includes:

S100. Obtain the actual temperature value of the outdoor environment;

S200. Compare the actual temperature value with a preset first temperature threshold value and a second temperature threshold value, and the first temperature threshold value is less than the second temperature threshold value;

S300: Determine the starting frequency of the air conditioner based on the result of the comparison.

Exemplarily, a temperature sensor may be set in the outdoor environment to detect the actual temperature value of the outdoor environment, the temperature sensor may be communicatively connected with the controller of the air conditioning system, and the temperature sensor may feed back the acquired actual temperature value of the outdoor environment to the air conditioning system The controller of the air conditioning system compares the actual temperature value with the preset first temperature threshold and the second temperature threshold respectively, and determines the starting frequency of the air conditioner based on the result of the comparison.

This embodiment provides a method for determining the start frequency of an air conditioner, which compares the acquired actual temperature value of the outdoor environment with a preset first temperature threshold and a second temperature threshold, and determines the air conditioner based on the result of the comparison. Start frequency. In this way, according to the actual temperature values of different outdoor environments, the startup frequency of the air conditioner is determined separately, so that the air conditioner can be turned on normally without failure when the outdoor temperature is high, and the performance of the air conditioner is further optimized, and Improve the user experience.

As a preferred implementation of the method for determining the start frequency of the air conditioner provided in this embodiment, in the above step S300, determining the start frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is less than or equal to the first temperature threshold , The start frequency of the air conditioner is determined as the first start frequency.

Exemplarily, the first temperature threshold is the critical value of the outdoor ambient temperature with negligible influence on the start frequency of the air conditioner, for example, it may be 35°C; and the refrigeration rating of the T1 climate type air conditioner is also 35°C, most of which The starting point for the development of air conditioning systems is this rating. In specific applications, the first temperature threshold can be any value between 32°C and 38°C; the first starting frequency can be the maximum starting frequency of the air conditioner, for example, 40 Hz; when the actual temperature of the outdoor environment is less than or equal to the first When a temperature threshold is reached, the air conditioner can be started according to the maximum starting frequency value to ensure that the air conditioner starts quickly at the highest possible frequency.

As a preferred implementation of the method for determining the startup frequency of the air conditioner provided by this embodiment, in the above step S300, determining the startup frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is between the first temperature threshold and When the temperature is between the second temperature thresholds, the starting frequency of the air conditioner is determined according to the functional relationship between the preset starting frequency and the actual temperature value.

Exemplarily, the second temperature threshold may be the highest temperature value of the outdoor environment when the air conditioner is operating normally. When the actual temperature value of the outdoor environment is between the first temperature threshold and the second temperature threshold, if the air conditioner is started more frequently , It is easy to cause the inability to adapt to the actual temperature of the outdoor environment, causing the compressor discharge pressure to be too high and the shutdown protection of the air conditioning system occurs. Therefore, when the ambient temperature is high, the starting frequency of the air conditioner can be appropriately reduced to ensure that the air conditioner starts normally. It is a more convenient and practical method to determine the starting frequency of the air conditioner by the function relationship of the preset starting frequency with the actual temperature value.

As a preferred implementation of the method for determining the start frequency of the air conditioner provided in this embodiment, the functional relationship is used to characterize the general trend of the start frequency decreasing as the actual temperature value increases.

Exemplarily, the overall functional relationship can represent the relationship that the start frequency decreases with the increase of the actual temperature value. The functional relationship can be a linear relationship corresponding to the straight line A shown in FIG. 2, or it may be as shown in FIG. 2. The non-linear relationship corresponding to the concave curve B may also be the non-linear relationship corresponding to the convex curve C shown in FIG. 2 and the non-linear relationship corresponding to the stepped broken line D shown in FIG. 3. Those skilled in the art can make specific settings based on differences in compressor performance, refrigerant types, and the like. Further, when the functional relationship is the linear relationship corresponding to the straight line A shown in Figure 2, the first temperature threshold is 35°C, the second temperature threshold is 54°C, and the maximum starting frequency of the air conditioner is 40 Hz. The lowest effective starting frequency is 10Hz as an example, and the corresponding function relationship is f=(-1.58*Tao+95.26)Hz, where Tao represents the actual temperature value of the outdoor environment.

In addition, compressor specifications generally have a minimum starting frequency (or minimum effective starting frequency) recorded, so when the starting frequency of the air conditioner is determined according to the actual temperature value of the outdoor environment, in order to make the air conditioner start normally, it should be ensured that the air conditioner The starting frequency is not lower than the minimum starting frequency. In the function images shown in Figure 2 and Figure 3, 10 Hz is used as the lowest effective starting frequency of the air conditioner.

As a preferred implementation of the method for determining the start frequency of the air conditioner provided in this embodiment, in the above step S300, determining the start frequency of the air conditioner based on the result of the comparison includes: if the actual temperature value is greater than or equal to the second temperature threshold , The starting frequency of the air conditioner is determined to be 0.

Exemplarily, the second temperature threshold may be the highest temperature value of the outdoor environment when the air conditioner is operating normally. For example, a T3 climate type air conditioner has a maximum working environment temperature of 52°C. In Figures 2 and 3, the second temperature threshold is 54°C as an example. When the actual temperature of the outdoor environment is greater than or equal to the second temperature threshold, in order to protect the air-conditioning system from accidents, the air-conditioning may be prohibited from starting.

It should be noted that although the detailed steps of the method of the present invention are described in detail above, those skilled in the art can combine, split and exchange the order of the above steps without departing from the basic principles of the present invention. The modified technical solution does not change the basic idea of the present invention, and therefore also falls within the protection scope of the present invention.

Those skilled in the art should understand that the method for determining the starting frequency of the air conditioner provided in this embodiment can be stored as a program in a computer readable storage medium. The storage medium includes a number of instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute part of the steps of the methods in the various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

In addition, this embodiment correspondingly provides a system for determining the start frequency of an air conditioner, including: an acquisition module, which is used to acquire the actual temperature value of the outdoor environment; and a comparison module, which is used to compare the actual temperature value with the preset temperature. The set first temperature threshold and the second temperature threshold are compared, and the first temperature threshold is less than the second temperature threshold; the determining module, the determining module is used to determine the starting frequency of the air conditioner based on the result of the comparison.

As a preferred implementation of the system for determining the starting frequency of the air conditioner provided by this embodiment, the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is less than or equal to the first temperature threshold, Then the starting frequency of the air conditioner is determined as the first starting frequency.

As a preferred implementation of the system for determining the activation frequency of the air conditioner provided in this embodiment, the determining module determines the activation frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is between the first temperature threshold and the first temperature threshold When the temperature is between the two temperature thresholds, the starting frequency of the air conditioner is determined according to the functional relationship between the preset starting frequency and the actual temperature value.

As a preferred implementation of the system for determining the start frequency of the air conditioner provided in this embodiment, the functional relationship is used to characterize the general trend that the start frequency decreases as the actual temperature value increases.

As a preferred implementation of the system for determining the start frequency of the air conditioner provided in this embodiment, the determining module determines the start frequency of the air conditioner based on the result of the comparison in the following manner: if the actual temperature value is greater than or equal to the second temperature threshold, Then the starting frequency of the air conditioner is determined to be zero.

The system for determining the start frequency of the air conditioner provided in this embodiment corresponds to the method for determining the start frequency of the air conditioner described above. Therefore, the system for determining the start frequency of the air conditioner in this embodiment will not be described again. Those skilled in the art will still This embodiment can be clearly understood, and can be implemented smoothly on the basis of understanding.

In the system for determining the start frequency of the air conditioner provided in this embodiment, the comparison module compares the actual temperature value of the outdoor environment acquired by the acquisition module with the preset first temperature threshold and the second temperature threshold, and then determines the module based on the comparison module The result of the comparison determines the starting frequency of the air conditioner. In this way, according to the actual temperature values of different outdoor environments, the determination system of this embodiment can determine the start frequency of the air conditioner separately, so that the air conditioner can be turned on normally without malfunction when the outdoor temperature is high, and further The performance of the air conditioner is optimized and the user experience is improved.

It should be noted that the system for determining the start frequency of the air conditioner provided in the above embodiments is only illustrated by the division of the above functional modules (such as the acquisition module, the comparison module, the determination module, etc.). In actual applications, it can be described as required. The above functional modules are completed by different functional modules, that is, the functional modules in the embodiments of the present invention are further decomposed or combined. For example, the functional modules of the above embodiments can be combined into one functional module or further divided into multiple sub-modules. Module to complete all or part of the functions described above. The names of the functional modules involved in the embodiments of the present invention are only for distinguishing purposes, and are not regarded as improper limitations on the present invention.

The various embodiments of the present invention may be implemented in hardware, or implemented in software modules running on one or more processors, or implemented in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all components in the server and the client according to the embodiments of the present invention. The present invention can also be implemented as a device or device program (for example, a PC program and a PC program product) for executing part or all of the methods described herein. Such a program for realizing the present invention may be stored on a PC-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are protected by the present invention. Within the scope and form different embodiments. For example, in the claims of the present invention, any one of the claimed embodiments can be used in any combination.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A method for determining the starting frequency of an air conditioner, which is characterized in that it includes:

Obtain the actual temperature value of the outdoor environment;

Comparing the actual temperature value with a preset first temperature threshold value and a second temperature threshold value, and the first temperature threshold value is less than the second temperature threshold value;

The starting frequency of the air conditioner is determined based on the result of the comparison.
The determining method according to claim 1, wherein the determining the starting frequency of the air conditioner based on the result of the comparison comprises:

If the actual temperature value is less than or equal to the first temperature threshold, the starting frequency of the air conditioner is determined as the first starting frequency.
The determining method according to claim 1, wherein the determining the starting frequency of the air conditioner based on the result of the comparison comprises:

If the actual temperature value is between the first temperature threshold value and the second temperature threshold value, the starting frequency of the air conditioner is determined according to the function relationship of the preset starting frequency changing with the actual temperature value.
The determination method according to claim 3, wherein the functional relationship is used to characterize the general trend that the start frequency decreases with the increase of the actual temperature value.
The determining method according to claim 1, wherein the determining the starting frequency of the air conditioner based on the result of the comparison comprises:

If the actual temperature value is greater than or equal to the second temperature threshold value, the starting frequency of the air conditioner is determined to be zero.
A system for determining the starting frequency of an air conditioner, which is characterized in that it includes:

An obtaining module, the obtaining module is used to obtain the actual temperature value of the outdoor environment;

A comparison module, the comparison module is configured to compare the actual temperature value with a preset first temperature threshold value and a second temperature threshold value, and the first temperature threshold value is less than the second temperature threshold value;

The determining module is configured to determine the starting frequency of the air conditioner based on the result of the comparison.
The determining system according to claim 6, wherein the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner:

If the actual temperature value is less than or equal to the first temperature threshold, the starting frequency of the air conditioner is determined as the first starting frequency.
The determining system according to claim 6, wherein the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner:

If the actual temperature value is between the first temperature threshold value and the second temperature threshold value, the starting frequency of the air conditioner is determined according to the function relationship of the preset starting frequency changing with the actual temperature value.
The determination system according to claim 8, wherein:

The functional relationship is used to characterize the general trend of the start-up frequency decreasing with the increase of the actual temperature value.
The determining system according to claim 6, wherein the determining module determines the starting frequency of the air conditioner based on the result of the comparison in the following manner:

If the actual temperature value is greater than or equal to the second temperature threshold value, the starting frequency of the air conditioner is determined to be zero.