WO2018196578A1

WO2018196578A1 - Method for controlling heating operation of air conditioner

Info

Publication number: WO2018196578A1
Application number: PCT/CN2018/082078
Authority: WO
Inventors: 刘聚科; 徐贝贝; 许国景; 吕兴宇
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-04-25
Filing date: 2018-04-06
Publication date: 2018-11-01
Also published as: CN107062549A; CN107062549B

Abstract

Method for controlling heating operation of air conditioner. The method comprises: an air conditioner carrying out a heating operation, and acquiring an indoor temperature; if the indoor temperature is not greater than a first indoor temperature threshold value, executing fuzzy control; according to the difference in temperature between the indoor temperature and a set target indoor temperature, carrying out room temperature PID calculation so as to obtain a first target frequency; acquiring a coil temperature of an indoor heat exchanger, and if the coil temperature is greater than a set target coil temperature, determining the first target frequency to be an indoor unit frequency; otherwise, increasing the current operation frequency of a compressor so as to obtain a second target frequency, selecting the larger value of the first target frequency and the second target frequency, and determining the larger value to be the indoor unit frequency, and controlling the compressor of the air conditioner; and entering fuzzy control and controlling an indoor fan of the air conditioner so same operates at the highest wind speed. The method can solve the problem of uncomfortable heating temperatures resulting from existing air conditioners being slow to provide heating.

Description

Air conditioner heating operation control method

Technical field

The present invention relates to the field of air conditioning technology, and more particularly to the control of an air conditioner, and more particularly to an air conditioner heating operation control method.

Background technique

In the cold winter, air conditioners are the main way to warm up in areas where there is no heating or in cold weather where heating is stopped.

In the heating operation of the existing air conditioner, the compressor frequency is controlled according to the difference between the indoor temperature and the set indoor target temperature. If the compressor frequency obtained from the difference between the indoor temperature and the set indoor target temperature is not large enough, the indoor temperature rises slowly, and the indoor temperature is still low for a long time after the start-up, which cannot quickly make people feel comfortable, especially in When the room temperature is low, it is longer to wait for the indoor temperature to be comfortable.

Therefore, solving the problem that the air conditioner is slow to heat and cause discomfort is the key to improving the performance of the air conditioner.

technical problem

The object of the present invention is to provide a method for controlling the heating operation of an air conditioner, which solves the problem that the heating of the existing air conditioner is slow and the heating is uncomfortable.

Technical solution

In order to achieve the above object, the heating operation control method provided by the present invention is implemented by the following technical solutions:

An air conditioner heating operation control method, characterized in that the method comprises:

The air conditioner is heated to obtain an indoor temperature, and the indoor temperature is compared with a first indoor temperature threshold;

If the indoor temperature is not greater than the first indoor temperature threshold, perform the following fuzzy control:

Calculating a temperature difference between the indoor temperature and the set indoor target temperature, obtaining an indoor temperature difference, performing a room temperature PID calculation according to the indoor temperature difference to obtain a first target frequency; acquiring a coil temperature of the indoor heat exchanger, and setting The coil target temperature is compared; if the coil temperature is greater than the set coil target temperature, the first target frequency is determined as an indoor unit frequency; if the coil temperature is not greater than the set coil a target temperature, increasing a current operating frequency of the compressor to obtain a second target frequency, and selecting a larger one of the first target frequency and the second target frequency as an indoor unit frequency; controlling the indoor unit frequency according to the target frequency Compressor for air conditioners;

While entering the fuzzy control, the indoor fan of the air conditioner is controlled to operate at the highest wind speed.

Beneficial effect

Compared with the prior art, the advantages and positive effects of the present invention are: the invention sets the indoor temperature threshold, and when the indoor temperature is not greater than the indoor temperature threshold during the heating operation of the air conditioner, the fuzzy control is performed, and the room temperature PID operation is selected to determine The frequency and the larger frequency value determined based on the coil temperature of the indoor heat exchanger control the compressor, while controlling the indoor fan to operate at the highest wind speed, which can make the indoor temperature rise rapidly when the indoor temperature is low, The air outlet temperature of the air conditioner can be prevented from being too low, and the problem that the indoor temperature rises slowly and the lower temperature of the air blows out and the heating body feels uncomfortable is effectively solved, thereby improving the heating performance of the air conditioner.

Other features and advantages of the present invention will become apparent from the Detailed Description of the Drawing.

DRAWINGS

1 is a flow chart showing an embodiment of an air conditioner heating operation control method based on the present invention;

Fig. 2 is a flow chart showing another embodiment of the air conditioner heating operation control method based on the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to Fig. 1, there is shown a flow chart of an embodiment of a heating operation control method for an air conditioner based on the present invention.

As shown in FIG. 1, the specific process of implementing the heating operation control in this embodiment is as follows:

Step 11: The air conditioner is heated to obtain the indoor temperature, and the indoor temperature is compared with the first indoor temperature threshold.

Specifically, the indoor temperature refers to the indoor temperature of the room in which the air conditioner is located in real time according to the set frequency when the air conditioner is turned on and the heating mode is operated. The indoor temperature can be obtained by using the prior art. For example, the inlet air temperature is detected and acquired as a room temperature by a temperature sensor disposed at or near the air inlet of the air conditioner.

The room temperature is then compared to a first temperature threshold. The first indoor temperature threshold is used as a threshold temperature for performing fuzzy control, and is a default temperature value preset in the control program when the air conditioner is shipped, or may be a temperature value set by the air conditioner user. If it is set by the user, it is recommended that the air conditioner recommend a reference temperature value for the user's reference. Preferably, the preset first indoor temperature threshold or the recommended first indoor temperature threshold is 20 °C.

Step 12: Perform fuzzy control when the indoor temperature is not greater than the first indoor temperature threshold; while entering the fuzzy control, control the indoor fan of the air conditioner to operate at the highest wind speed.

Among them, the fuzzy control specifically includes:

Calculate the temperature difference between the indoor temperature and the set indoor target temperature, obtain the indoor temperature difference, perform room temperature PID calculation according to the indoor temperature difference, and obtain the first target frequency. The indoor temperature is the indoor temperature obtained in step 11, and the set indoor target temperature refers to the target temperature set by the user and desired in the indoor. The specific method for performing the room temperature PID calculation based on the indoor temperature difference and obtaining the target frequency for controlling the compressor can be implemented by using the prior art, and will not be described or limited in detail herein.

At the same time, the coil temperature of the indoor heat exchanger is obtained and compared with the target temperature of the set coil. If the coil temperature is greater than the target coil temperature, the first target frequency obtained by the room temperature PID calculation is determined as the indoor unit frequency; if the coil temperature is not greater than the set coil target temperature, the current operating frequency of the compressor is increased. The second target frequency is obtained, and a larger one of the first target frequency and the second target frequency is selected as the indoor unit frequency; then, the compressor of the air conditioner is controlled according to the indoor unit frequency.

The coil temperature of the indoor heat exchanger is the coil temperature of the indoor heat exchanger obtained according to the set frequency. The coil temperature can be obtained by setting a temperature sensor on the heat exchanger coil. Setting the target temperature of the coil is the target temperature of the coil that can be achieved by the indoor heat exchanger. It can be a default temperature value preset in the control program at the factory, or it can be a temperature set by the air conditioner user. value. If it is set by the user, it is recommended that the air conditioner recommend a reference temperature value for the user's reference. Preferably, the preset set coil target temperature or the recommended set coil target temperature range is 42-56 ° C, preferably 50 ° C.

After comparison, if the coil temperature is greater than the target temperature of the coil, indicating that the coil temperature is higher, the outlet temperature of the air conditioner determined by the coil temperature will not be too low. At this time, the adjustment of the indoor temperature is taken as the main The control target determines the first target frequency calculated from the room temperature PID as the indoor unit frequency, and controls the compressor of the air conditioner according to the indoor unit frequency. The specific process of frequency control of the air conditioner compressor based on the indoor unit frequency refers to the prior art.

If the coil temperature is not greater than the target temperature of the set coil after the comparison, indicating that the coil temperature is not high enough, the air outlet temperature of the air conditioner determined by the coil temperature is low, which is likely to cause the air conditioner because the indoor temperature is low. The outlet air temperature is also low and an unfavorable air is sent out. In this case, consider raising the coil temperature, and at the same time, it is necessary to balance the indoor temperature adjustment. Therefore, the current operating frequency of the compressor is increased to obtain a second target frequency, and the second target frequency is compared with the first target frequency obtained by the room temperature PID operation, and the larger value is determined as the indoor unit frequency, according to The indoor unit frequency controls the compressor of the air conditioner. The specific process of frequency control of the air conditioner compressor based on the indoor unit frequency refers to the prior art. The current operating frequency of the compressor is raised to a second target frequency in order to increase the frequency so that the coil temperature approaches the set coil target temperature.

Moreover, while entering the fuzzy control, the indoor fan that controls the air conditioner operates at the maximum wind speed allowed to speed up the air flow speed and increase the indoor temperature rise speed.

When the air conditioner is heated and controlled by the above process, if the indoor temperature is not greater than the first indoor temperature threshold, indicating that the current indoor temperature is low, the fuzzy control will be performed, and the frequency determined by the room temperature PID operation and the disk based on the indoor heat exchanger are selected. The larger frequency value in the frequency determined by the tube temperature controls the compressor, and when the indoor temperature and the coil temperature are both low, the compressor is operated at a high frequency, so that the indoor temperature rapidly rises to a suitable high temperature, and the air conditioner can be made The outlet air temperature is not too low, so that the air outlet temperature of the air conditioner is not too low, and the problem that the indoor temperature rises slowly and the lower temperature of the air blows out causes the heating body to be uncomfortable is effectively solved. Moreover, by adopting the fuzzy control, even when the indoor temperature is low, the lower indoor target temperature is set due to the user's erroneous operation, the larger frequency value can be obtained by the up-conversion based on the coil temperature determination. In this case, the high-frequency operation of the compressor is controlled, and the indoor temperature is raised to a suitable high temperature, which further improves the heating performance of the air conditioner.

Referring to Fig. 2, there is shown a flow chart of another embodiment of the air conditioner heating operation control method based on the present invention.

As shown in FIG. 2, the specific process of implementing the heating operation control in this embodiment is as follows:

Step 21: The air conditioner is heated to obtain the indoor temperature, and the indoor temperature is compared with the first indoor temperature threshold.

The room temperature is then compared to a first temperature threshold. The first indoor temperature threshold is a default temperature value preset in the control program when the air conditioner is shipped from the factory, or may be a temperature value set by the air conditioner user. If it is set by the user, it is recommended that the air conditioner recommend a reference temperature value for the user's reference. Preferably, the preset first indoor temperature threshold or the recommended first indoor temperature threshold is 20 °C.

Step 22: Determine whether the indoor temperature is greater than the first indoor temperature threshold. If yes, go to step 28; otherwise, go to step 23.

Step 23: Perform fuzzy control, and control the indoor fan of the air conditioner to operate at the highest wind speed while entering the fuzzy control.

If step 22 determines that the indoor temperature is not greater than the first indoor temperature threshold, then the fuzzy control process is performed. The specific process and method of fuzzy control can be referred to the description of the embodiment of FIG. 1.

Step 24: Acquire an indoor temperature, and compare the indoor temperature with the first indoor temperature threshold and the second indoor temperature threshold.

Specifically, in the process of performing the fuzzy control, the indoor temperature is still acquired in real time, and the acquired indoor temperature is compared with the first indoor temperature threshold and the second indoor temperature threshold. Wherein, the second indoor temperature threshold is used as the threshold temperature for exiting the fuzzy control, similar to the first indoor temperature threshold, and the second indoor temperature threshold is also a default temperature value preset in the control program when the air conditioner is shipped from the factory, or may be A temperature value set by the air conditioner user. If it is set by the user, it is recommended that the air conditioner recommend a reference temperature value for the user's reference. Preferably, the preset second indoor temperature threshold or the recommended second indoor temperature threshold is 25 °C.

Step 25: Determine whether the indoor temperature is greater than the second indoor temperature threshold. If yes, go to step 28; otherwise, go to step 26.

If the indoor temperature is greater than the second indoor temperature threshold, the fuzzy control is to be exited, and the control of step 28 is performed. The purpose is to prevent the high frequency operation from being forced after the indoor temperature reaches a suitable second indoor temperature. Warm down.

Step 26: Determine whether the indoor temperature is greater than the first indoor temperature threshold. If yes, go to step 27; otherwise, go to step 23.

If the indoor temperature is not greater than the first indoor temperature threshold, then go to step 23, continue to perform the fuzzy control, and control the indoor fan to operate at the highest wind speed.

Step 27: Perform fuzzy control to control the indoor fan to run at a wind speed lower than the highest wind speed.

If it is determined in steps 25 and 26 that the indoor temperature is greater than the first indoor temperature threshold but not greater than the second indoor temperature threshold, the fuzzy control is still performed, but the control indoor fan speed is decreased, and the wind speed is lower than the highest wind speed, for example, , running wind speed or low wind speed to extend the action time of fuzzy control to avoid temperature shutdown.

Similarly, in the process, the process of obtaining the indoor temperature and comparing with the temperature threshold is continued to perform step 24 in order to perform different control in real time according to the change of the indoor temperature.

Step 28: Perform room temperature PID control while controlling the indoor fan to run at the set wind speed.

This step is selected for execution based on the judgment result of step 22 or step 25. Specifically, if it is determined in step 22 that the indoor temperature before entering the fuzzy control is greater than the first indoor temperature threshold, the blur control is not performed, but the room temperature PID control is performed. That is, if the indoor temperature is greater than the first indoor temperature threshold, indicating that the indoor temperature is not low, in this case, the coil temperature is not considered, and the conventional room temperature PID control is used to calculate the indoor temperature and the set indoor target temperature. The temperature difference is obtained, the indoor temperature difference is obtained, the room temperature PID calculation is performed according to the indoor temperature difference, the first target frequency is obtained, the first target frequency is used as the indoor unit frequency, and the compressor of the air conditioner is controlled according to the indoor unit frequency.

If it is determined in step 25 that the indoor temperature during the execution of the fuzzy control is greater than the second indoor temperature threshold, the fuzzy control will be exited and the room temperature PID control process will be transferred. That is, if the indoor temperature is greater than the second indoor temperature threshold during the fuzzy control process, in order to avoid the temperature shutdown, the coil temperature is no longer considered, and the normal room temperature PID control is used to calculate the indoor temperature and the set indoor target temperature. The temperature difference between the two is obtained, and the indoor temperature difference is obtained. The room temperature PID calculation is performed according to the indoor temperature difference to obtain the first target frequency, and the first target frequency is used as the indoor unit frequency, and the compressor of the air conditioner is controlled according to the indoor unit frequency.

Moreover, during the room temperature PID control process, the control indoor fan operates at the set wind speed. Here, the set wind speed can be either the wind speed set by the user or, of course, the default wind speed set by the system if the user does not set it.

For other technical effects of performing the heating control by using the embodiment of FIG. 2, reference may be made to the description of the embodiment of FIG. 1.

In the fuzzy control process of the above embodiments, the second target frequency can be determined in a plurality of different manners. In some preferred embodiments, the second target frequency can be determined in the following manner:

After obtaining the coil temperature, it is first determined whether the coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, and different processing is performed according to the judgment result. Specifically, if the coil temperature is not greater than the set coil target temperature for the first time after starting, to set the coil temperature as soon as possible, the set heating maximum frequency is determined as the second target frequency. The maximum heating frequency is the set maximum frequency during the heating operation of the air conditioner. If the coil temperature is not greater than the set coil target temperature for the first time after starting, the current operating frequency of the compressor is increased to obtain a second target frequency between the current operating frequency and the heating maximum frequency. If the coil temperature is not greater than the set coil target temperature for the first time, indicating that the fuzzy control has been performed, the coil temperature will not be too lower than the coil target temperature. In this case, the second target frequency does not need to be raised to the system. The maximum frequency of heat, but a frequency value between the current operating frequency and the maximum frequency of heating, can avoid the temperature shutdown caused by excessive frequency.

Moreover, if the coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the current operating frequency of the compressor is obtained, and the current operating frequency is increased by the set adjustment frequency every set adjustment time. The raised frequency is determined as the second target frequency. Moreover, each time the current operating frequency is raised as the second target frequency, it is first determined whether the difference between the set coil target temperature and the coil temperature is not less than the set overshoot temperature value; if yes, at the adjustment time After the arrival, the process of increasing the current operating frequency as the second target frequency is continued, otherwise, the second target frequency is kept unchanged.

Specifically, if the coil temperature is not the first time that the air conditioner is turned on after the power is turned on, the current operating frequency is increased by the set adjustment frequency, and the increased frequency is determined as the second target frequency. The set adjustment frequency is a frequency value preset before the air conditioner leaves the factory, or a frequency value set by the user, for example, set to 5 Hz. The frequency value is used as a frequency adjustment step size to indicate the increase in the current operating frequency each time. Moreover, the frequency reduction is performed by reducing the setting adjustment time once, and the stepwise adjustment is performed, and the increased frequency is used as the second target frequency. After the current operating frequency increases the adjustment frequency, it is first determined whether the difference between the set coil temperature and the coil temperature is greater than the overshoot temperature value. Among them, the overshoot temperature value is also a set temperature value, for example, set to 1 °C. If it is judged that the difference between the set coil temperature and the coil temperature is greater than the overshoot temperature value, indicating that the coil temperature is much lower than the set coil temperature, further upsampling is required. Moreover, as described above, the up-conversion process is increased once for the adjustment time set by the interval. The adjustment time is also a pre-set value indicating the interval between frequency adjustments. For example, it can be set to 2 min. That is, after adjusting once, the adjusted frequency is used as the second target frequency. When the adjustment time is not reached, the second target frequency is kept unchanged until the fuzzy control is exited and the room temperature PID control or shutdown or adjustment time is entered. Arrivals. After the adjustment time arrives, read the current operating frequency of the compressor, and continue to increase the frequency according to the adjustment frequency based on the current operating frequency.

If it is determined that the difference between the set coil temperature and the coil temperature is not greater than the overshoot temperature value, it indicates that the coil temperature has not reached the set coil temperature, but the difference from the set coil temperature is small, not greater than Adjust the temperature value. At this time, the frequency is no longer raised subsequently. Thus, the determined second target frequency is maintained unchanged until the fuzzy control is exited and the room temperature PID control or shutdown is entered.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still The technical solutions are described as being modified, or equivalents are replaced by some of the technical features; and such modifications or substitutions do not depart from the spirit and scope of the technical solutions claimed in the present invention.

Claims

An air conditioner heating operation control method, characterized in that the method comprises:

The air conditioner is heated to obtain an indoor temperature, and the indoor temperature is compared with a first indoor temperature threshold;

If the indoor temperature is not greater than the first indoor temperature threshold, perform the following fuzzy control:

Calculating a temperature difference between the indoor temperature and the set indoor target temperature, obtaining an indoor temperature difference, performing a room temperature PID calculation according to the indoor temperature difference to obtain a first target frequency; acquiring a coil temperature of the indoor heat exchanger, and setting The coil target temperature is compared; if the coil temperature is greater than the set coil target temperature, the first target frequency is determined as an indoor unit frequency; if the coil temperature is not greater than the set coil a target temperature, increasing a current operating frequency of the compressor to obtain a second target frequency, and selecting a larger one of the first target frequency and the second target frequency as an indoor unit frequency; controlling the indoor unit frequency according to the target frequency Compressor for air conditioners;

While entering the fuzzy control, the indoor fan of the air conditioner is controlled to operate at the highest wind speed.
The control method according to claim 1, wherein if the indoor temperature is greater than the first indoor temperature threshold, the following room temperature PID control is performed:

Determining the first target frequency as the indoor unit frequency, and controlling a compressor of the air conditioner according to the indoor unit frequency;

The indoor fan is controlled to operate at a set wind speed while entering the room temperature PID control.
The control method according to claim 1, wherein if the coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the second target frequency is the set maximum heating temperature. a frequency; if the coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the second target frequency is between the current operating frequency and the heating maximum frequency.
The control method according to claim 3, wherein if the coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the second target frequency is determined by the following process:

Obtaining the current operating frequency of the compressor, increasing the current operating frequency by a set adjustment frequency every set adjustment time, and determining the increased frequency as the second target frequency.
The control method according to claim 4, wherein each time the current operating frequency is increased by the adjustment frequency as the second target frequency, the set coil target temperature is first determined Whether the difference of the coil temperature is not less than the set overshoot temperature value; if yes, the process of increasing the current operating frequency by the adjusted frequency as the second target frequency is continued after the adjustment time is reached, Otherwise, the second target frequency is kept unchanged.
The control method according to any one of claims 1 to 5, wherein the method further comprises:

When performing the fuzzy control, acquiring the indoor temperature in real time, and comparing the indoor temperature with a second indoor temperature threshold; the second indoor temperature threshold is greater than the first indoor temperature threshold;

If the indoor temperature is greater than the second indoor temperature threshold, the fuzzy control is exited.
The control method according to claim 6, wherein the method further comprises:

After exiting the fuzzy control, the following room temperature PID control is performed:

Determining the first target frequency as the indoor unit frequency, and controlling a compressor of the air conditioner according to the indoor unit frequency;

At the same time, the indoor fan is controlled to operate at a set wind speed.
The control method according to claim 6, wherein if the indoor temperature is greater than the first indoor temperature threshold and not greater than the second indoor temperature threshold, the blur control is continuously performed; The indoor fan operates at a wind speed lower than the highest wind speed.