WO2021175202A1

WO2021175202A1 - Heating control method for variable-frequency air conditioner, and variable-frequency air conditioner

Info

Publication number: WO2021175202A1
Application number: PCT/CN2021/078617
Authority: WO
Inventors: 杨坤; 雷晏瑶; 李彬
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: 2020-03-03
Filing date: 2021-03-02
Publication date: 2021-09-10
Also published as: CN113357753A; CN113357753B

Abstract

The present invention belongs to the technical field of air conditioners, and aims to solve the problem of not being conducive to energy saving because the control logic of using a compressor to perform up-frequency heating is independent from the control logic of using an electric heating device to perform heating when an existing variable-frequency air conditioner can normally perform heating. Therefore, provided is a heating control method for a variable-frequency air conditioner. The variable-frequency air conditioner comprises an indoor unit, a compressor and an electric heating device, wherein the electric heating device is arranged on the indoor unit and can heat air output from the indoor unit. The heating control method comprises: acquiring an up-frequency power of a variable-frequency air conditioner; if the up-frequency power of the variable-frequency air conditioner is greater than or equal to a preset power, maintaining the current operating frequency of a compressor and starting an electric heating device; and if the up-frequency power of the variable-frequency air conditioner is smaller than the preset power, continuously increasing the operating frequency of the compressor. In the present invention, when an variable-frequency air conditioner normally performs heating, heating can be performed in a power-saving mode, thereby achieving energy saving and being environmentally friendly, and improving the user experience.

Description

Heating control method of inverter air conditioner and inverter air conditioner

Technical field

The invention belongs to the technical field of air conditioners, and specifically provides a heating control method of an inverter air conditioner and an inverter air conditioner.

Background technique

Air conditioners can adjust the indoor environment temperature. Inverter air conditioners are a type of air conditioner. The existing inverter air conditioners are generally equipped with electric heating devices. The electric heating devices can be turned on when the inverter air conditioners are insufficiently heated or have low heating efficiency. Heat or improve heating efficiency. However, when the inverter air conditioner can heat normally, since the control logic of the compressor up-frequency heating and the electric heating device are independent of each other, too much electric energy may be consumed, which is not conducive to energy saving.

Therefore, the art needs a new heating control method of the inverter air conditioner and the corresponding inverter air conditioner to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, when the existing inverter air conditioner can normally heat, the control logic of the compressor up-frequency heating and the electric heating device heating are independent of each other, which is not conducive to energy saving. The problem is that the present invention provides a heating control method for an inverter air conditioner. The inverter air conditioner includes an indoor unit, a compressor, and an electric heating device. The electric heating device is installed on the indoor unit and can heat the air out of the indoor unit and control the heating. The method includes: obtaining the up-converting power of the inverter air conditioner; if the up-converting power of the inverter air conditioner is greater than or equal to the preset power, maintaining the current operating frequency of the compressor and turning on the electric heating device; if the up-converting power of the inverter air conditioner is less than the preset power , Continue to increase the operating frequency of the compressor.

In the preferred technical solution of the above heating control method, before the step of "obtaining the up-conversion power of the inverter air conditioner", the heating control method further includes: obtaining the coil temperature of the indoor unit; and "obtaining the up-conversion power of the inverter air conditioner" The steps specifically include: judging whether the coil temperature of the indoor unit reaches the first target temperature; if the coil temperature of the indoor unit does not reach the first target temperature, the up-conversion power of the inverter air conditioner is obtained.

In the preferred technical solution of the above heating control method, before the step of "obtaining the coil temperature of the indoor unit", the heating control method includes: making the inverter air conditioner heating operation for a first preset time.

In the preferred technical solution of the above heating control method, the up-conversion power of the inverter air conditioner is determined according to the coil temperature of the indoor unit and the first target temperature.

In the preferred technical solution of the above heating control method, the up-conversion power of the inverter air conditioner is determined according to the difference between the first target temperature and the coil temperature of the indoor unit.

In the preferred technical solution of the above heating control method, the heating control method further includes: obtaining the coil temperature of the indoor unit after the electric heating device continues to operate for a second preset time; and judging whether the coil temperature of the indoor unit reaches the first 2. Target temperature: According to the judgment result, selectively increase the operating frequency of the compressor.

In the preferred technical solution of the above heating control method, the step of "selectively increasing the operating frequency of the compressor based on the judgment result" includes: if the coil temperature of the indoor unit does not reach the second target temperature, increasing the compressor Operating frequency.

In the preferred technical solution of the above heating control method, the step of "selectively increasing the operating frequency of the compressor according to the judgment result" further includes: if the coil temperature of the indoor unit reaches the second target temperature, maintaining the compressor Current operating frequency.

In the preferred technical solution of the above heating control method, the preset power is the rated heating power of the electric heating device.

In another aspect, the present invention also provides an inverter air conditioner. The inverter air conditioner includes a controller configured to execute the heating control method described above.

Those skilled in the art can understand that in the preferred technical solution of the present invention, the up-converting power of the inverter air conditioner is obtained. If the up-converting power is greater than or equal to the preset power, the inverter air conditioner using compressor up-conversion heating will be more Power consumption. At this time, the electric heating device is preferred for heating, and the compressor maintains the current operating frequency. If the up-conversion power is less than the preset power, the inverter air conditioner uses the compressor up-conversion heating to save electricity, and priority is given at this time The compressor is used for up-frequency heating, and the electric heating device is kept off. With this setting, when the inverter air conditioner can heat normally, it can be heated in a more power-saving way, thereby achieving energy saving and environmental protection, and improving user experience.

Further, after the electric heating device continues to operate for a second preset time, obtain the coil temperature of the indoor unit; determine whether the coil temperature of the indoor unit reaches the second target temperature; if the coil temperature of the indoor unit does not reach the second target If temperature, the operating frequency of the compressor is increased; if the coil temperature of the indoor unit reaches the second target temperature, the current operating frequency of the compressor is maintained. That is, after the electric heating device continues to operate for the second preset time, the heating of the inverter air conditioner still does not meet the requirements, that is, the coil temperature of the indoor unit does not reach the second target temperature, and the frequency of the compressor of the inverter air conditioner continues to increase. To meet the heating requirements of the user, if the heating of the inverter air conditioner meets the requirements, that is, the coil temperature of the indoor unit reaches the second target temperature, the frequency of the compressor of the inverter air conditioner does not need to be increased, that is, the inverter air conditioner can satisfy the user The heating requirements also take into account the energy saving, and further enhance the user experience.

Description of the drawings

Fig. 1 is a flowchart of an embodiment of a heating control method for an inverter air conditioner of the present invention.

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.

It should be noted that in the description of the present invention, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

Based on the background art pointed out that the existing inverter air conditioner can normally heat because the control logic of the compressor up-frequency heating and the electric heating device are independent of each other, which is not conducive to the problem of energy saving. The present invention provides a variable frequency The heating control method of the air conditioner and the inverter air conditioner are designed to enable the inverter air conditioner to be able to heat normally by adopting a relatively power-saving method for heating, thereby achieving energy saving and environmental protection and improving user experience.

Specifically, the inverter air conditioner of the present invention includes a controller, an indoor unit, a compressor, and an electric heating device. Of course, the inverter air conditioner also includes an outdoor unit, a throttle element and other components, which are not listed here. The electric heating device is installed on the indoor unit and can heat the air outlet of the indoor unit. The electric heating device can be an electric heating wire or an electric heating tube. The structure is flexibly set. The controller is configured to be able to execute the heating control method of the present invention. The heating control method of the present invention includes: obtaining the up-converting power of the inverter air conditioner; if the up-converting power of the inverter air conditioner is greater than or equal to the preset power, maintaining the current operating frequency of the compressor and turning on the electric heating device; If the frequency power is less than the preset power, continue to increase the operating frequency of the compressor. Among them, the preset power is preferably the rated power of the electric heating device. Of course, it can also be the correction value obtained by multiplying, adding or subtracting the rated power of the electric heating device and the correction coefficient. Of course, the preset power can also be a frequency conversion. The power value set by the user before the air conditioner leaves the factory, and those skilled in the art can flexibly set the preset power in practical applications. When the up-conversion power of the inverter air conditioner is greater than or equal to the preset power, it means that the current compressor up-conversion mode heating is very energy-intensive. It is better to turn on the electric heating device. At this time, keep the current operating frequency of the compressor and turn on the electric heating device. The electric heating device heats the outlet air of the indoor unit to improve the heating effect. When the up-converting power of the inverter air conditioner is less than the preset power, it means that the current compressor up-frequency heating method is more energy-efficient, and it is more energy-efficient than turning on the electric heating device. At this time, the compressor up-frequency method is still used for heating. That is, continue to increase the operating frequency of the compressor to improve the heating effect.

Preferably, before the step of "obtaining the up-conversion power of the inverter air conditioner", the heating control method further includes: obtaining the coil temperature of the indoor unit; the step of "obtaining the up-conversion power of the inverter air conditioner" specifically includes: judging the indoor unit's Whether the coil temperature reaches the first target temperature; if the coil temperature of the indoor unit does not reach the first target temperature, the up-conversion power of the inverter air conditioner is obtained. That is to say, by obtaining the coil temperature of the indoor unit, and then judging whether the coil temperature of the indoor unit reaches the first target temperature, it is determined whether the heating effect of the current inverter air conditioner meets the requirements. If the up-conversion power is not satisfied, the up-conversion power of the inverter air conditioner needs to be obtained. Among them, the first target temperature may be a temperature set by the user, or a temperature adjusted by the system according to the user's needs. More preferably, before the step of "obtaining the coil temperature of the indoor unit", the heating control method of the present invention includes: making the inverter air conditioner heating operation for a first preset time. That is to say, before detecting the coil temperature of the indoor unit, let the inverter air conditioner run for a period of time before detecting the coil temperature of the indoor unit, so that when the inverter air conditioner is running stable, perform detection and control operations. Conducive to the stable operation of the air conditioner. The coil temperature of the indoor unit can be detected by a temperature sensor. In addition, those skilled in the art can flexibly set the first target temperature and the first preset time in practical applications. Such adjustments and changes to the specific values of the first target temperature and the first preset time are not Constituting restrictions on the present invention should all be limited within the protection scope of the present invention.

Preferably, the up-conversion power of the inverter air conditioner is determined according to the coil temperature of the indoor unit and the first target temperature. For example, it can be determined according to the difference between the first target temperature and the coil temperature of the indoor unit. For example, the first target temperature is T and the coil temperature of the indoor unit is TM. The formula P=K*(T-TM) To calculate the up-conversion power P of the inverter air conditioner, where K is the correction coefficient. Of course, as an alternative, the up-converting power of the inverter air conditioner can also be determined by the operating current of the compressor, and those skilled in the art can flexibly set the way to determine the up-converting power of the inverter air conditioner in practical applications.

Preferably, the heating control method of the present invention further includes: obtaining the coil temperature of the indoor unit after the electric heating device continues to operate for a second preset time; determining whether the coil temperature of the indoor unit reaches the second target temperature; As a result, the operating frequency of the compressor is selectively increased. Among them, those skilled in the art can flexibly set the second target temperature and the second preset time in practical applications, and such adjustment and change of the specific values of the second target temperature and the second preset time does not constitute an impact on the present invention. All restrictions should be limited to the protection scope of the present invention. The second target temperature may be equal to or greater than the first target temperature. Specifically, the step of "selectively increasing the operating frequency of the compressor according to the judgment result" includes: if the coil temperature of the indoor unit does not reach the second target temperature, increasing the operating frequency of the compressor; if the coil of the indoor unit When the temperature reaches the second target temperature, the current operating frequency of the compressor is maintained. That is to say, after the electric heating device is turned on and running for the second preset time, if the coil temperature of the indoor unit still does not meet the requirements, that is, the second target temperature is not reached, the current operating frequency of the compressor is further increased. To improve the heating effect, if the coil temperature of the indoor unit meets the requirements, that is, reaches the second target temperature, there is no need to increase the operating frequency of the compressor, and just keep the current operating frequency. In the above, the coil temperature of the indoor unit reaching the second target temperature can be that the coil temperature of the indoor unit is greater than or equal to the second target temperature, and the coil temperature of the indoor unit does not reach the second target temperature can be the coil of the indoor unit The temperature is less than the second target temperature.

The technical solution of the present invention will be described below in conjunction with a more preferred embodiment.

As shown in Figure 1, the heating control method of the inverter air conditioner of the present invention includes:

S1: Make the air conditioner run time t1;

S2: Obtain the coil temperature TM of the indoor unit (this embodiment defaults that TM does not reach the target temperature T);

S3: Calculate the difference △T between the target temperature T and the coil temperature TM of the indoor unit;

S4: Use the formula P=K*△T to calculate the up-conversion power P of the air conditioner;

S5: Determine whether the up-conversion power P of the air conditioner is greater than or equal to the preset power P1;

S61: If yes, keep the current operating frequency of the compressor and turn on the electric heating device;

S62: If not, increase the operating frequency of the compressor;

S7: After the electric heating device continues to run for a time t2, judge whether the coil temperature TM of the indoor unit reaches the target temperature T;

S81: If yes, keep the current operating frequency of the compressor;

S82: If not, increase the operating frequency of the compressor.

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 heating control method for an inverter air conditioner, wherein the inverter air conditioner includes an indoor unit, a compressor, and an electric heating device. Heat it up,

The heating control method includes:

Obtaining the up-conversion power of the inverter air conditioner;

If the up-conversion power of the inverter air conditioner is greater than or equal to the preset power, maintaining the current operating frequency of the compressor and turning on the electric heating device;

If the up-converting power of the inverter air conditioner is less than the preset power, continue to increase the operating frequency of the compressor.
The heating control method according to claim 1, characterized in that, before the step of "obtaining the up-conversion power of the inverter air conditioner", the heating control method further comprises:

Obtaining the coil temperature of the indoor unit;

The steps of "obtaining the up-conversion power of the inverter air conditioner" specifically include:

Judging whether the coil temperature of the indoor unit reaches the first target temperature;

If the coil temperature of the indoor unit does not reach the first target temperature, the up-conversion power of the inverter air conditioner is obtained.
The heating control method according to claim 2, wherein before the step of "acquiring the coil temperature of the indoor unit", the heating control method comprises:

The heating operation of the frequency conversion air conditioner is continued for a first preset time.
The heating control method according to claim 2, wherein the up-conversion power of the inverter air conditioner is determined according to the coil temperature of the indoor unit and the first target temperature.
The heating control method according to claim 4, wherein the up-conversion power of the inverter air conditioner is determined according to the difference between the first target temperature and the coil temperature of the indoor unit.
The heating control method according to claim 1, wherein the heating control method further comprises:

Obtaining the coil temperature of the indoor unit after the electric heating device continues to operate for a second preset time;

Judging whether the coil temperature of the indoor unit reaches the second target temperature;

According to the judgment result, the operating frequency of the compressor is selectively increased.
The heating control method according to claim 6, wherein the step of "selectively increasing the operating frequency of the compressor according to the judgment result" comprises:

If the coil temperature of the indoor unit does not reach the second target temperature, the operating frequency of the compressor is increased.
8. The heating control method according to claim 7, wherein the step of "selectively increasing the operating frequency of the compressor according to the judgment result" further comprises:

If the coil temperature of the indoor unit reaches the second target temperature, the current operating frequency of the compressor is maintained.
The heating control method according to any one of claims 1 to 8, wherein the preset power is the rated heating power of the electric heating device.
An inverter air conditioner, characterized in that the inverter air conditioner includes a controller configured to execute the heating control method according to any one of claims 1 to 9.