CN106052009B - Convertible frequency air-conditioner control method for frequency and control device - Google Patents

Abstract

The invention discloses a frequency control method and a control device of an inverter air conditioner. The method comprises: the air conditioner operates in refrigeration mode, performs room temperature PID calculation according to the temperature difference between the real-time indoor ambient temperature and the set target temperature, and obtains the first frequency; detects the indoor temperature of the air conditioner. and determine the real-time distance between the heat source and the air conditioner, and determine the frequency corresponding to the real-time distance as the second frequency; if the real-time indoor ambient temperature is not less than the set comfort temperature, choose the smaller of the first frequency and the second frequency The value is used as the target frequency; if the real-time indoor ambient temperature is lower than the set comfort temperature, the target frequency is selected according to the fuzzy control based on the real-time coil temperature; the compressor operation of the air conditioner is controlled according to the target frequency. By applying the present invention, energy saving and comfortable control of the air conditioner can be realized.

Description

Inverter air conditioner frequency control method and control device

technical field

The invention belongs to the technical field of air conditioning, in particular relates to an air conditioner for adjusting indoor air, and more specifically relates to a frequency control method and a control device for an inverter air conditioner.

Background technique

The air conditioner can cool in summer and heat in winter, and can adjust the indoor temperature to make it warm in winter and cool in summer, providing users with a comfortable environment. While air conditioners provide users with comfort, it is accompanied by contradictions with high energy consumption. Energy consumption not only increases the economic burden of users, but also goes against the trend of energy conservation and environmental protection. Therefore, how to reduce the energy consumption of the air conditioner while using the air conditioner to provide a comfortable environment for the user is a problem that the air conditioner manufacturers have been working hard to solve.

The existing frequency conversion air conditioner can control the operating frequency of the compressor according to the indoor ambient temperature and the set target temperature, so as to achieve the purpose of saving energy and reducing consumption. However, the control method of simply controlling the operating frequency of the compressor based on the temperature cannot achieve better energy saving and comfort control.

Contents of the invention

The object of the present invention is to provide a frequency control method and a control device for an inverter air conditioner, so as to realize energy saving and comfortable control of the air conditioner.

In order to achieve the purpose of the above invention, the frequency control method of the frequency conversion air conditioner provided by the present invention is realized by the following technical solutions:

A frequency control method for an inverter air conditioner, the method comprising:

Air conditioner cooling operation, obtain the real-time indoor ambient temperature and set indoor target temperature, calculate the temperature difference between the real-time indoor ambient temperature and the set indoor target temperature, as the real-time indoor temperature difference, and perform room temperature PID according to the real-time indoor temperature difference Calculate and obtain the first frequency; detect the heat source in the room where the air conditioner is located in real time and determine the real-time distance between the heat source and the air conditioner, and obtain the frequency corresponding to the real-time distance according to the known correspondence between the distance and the frequency, as the second frequency;

Comparing the real-time indoor ambient temperature with the set comfort temperature;

If the real-time indoor ambient temperature is not less than the set comfort temperature, perform the following first control: select the smaller value of the first frequency and the second frequency to control the compressor operation of the air conditioner;

If the real-time indoor ambient temperature is lower than the set comfort temperature, perform the following second control: obtain the real-time coil temperature of the air conditioner evaporator, and compare the real-time coil temperature with the set coil target temperature; If the real-time coil temperature is greater than the set coil target temperature, select the smaller value of the first frequency and the second frequency as the target frequency, and control the operation of the compressor of the air conditioner according to the target frequency; If the real-time coil temperature is not greater than the set coil target temperature, reduce the current operating frequency of the compressor to obtain a third frequency, and select the first frequency, the second frequency and the third frequency A smaller value controls the compressor operation of the air conditioner.

In order to achieve the aforementioned purpose of the invention, the inverter air conditioner frequency control device provided by the present invention is realized by the following technical solutions:

A frequency control device for an inverter air conditioner, the device comprising:

Indoor ambient temperature acquisition unit, used to obtain real-time indoor ambient temperature;

The coil temperature acquisition unit is used to acquire the real-time coil temperature of the air conditioner evaporator;

A room temperature PID calculation unit, used to calculate the temperature difference between the real-time indoor ambient temperature and the set indoor target temperature as the real-time indoor temperature difference, perform PID calculation according to the real-time indoor temperature difference, and obtain and output the first frequency;

The heat source determination and distance acquisition unit is used to detect the heat source in the room where the air conditioner is located in real time and determine the real-time distance between the heat source and the air conditioner;

A second frequency acquiring unit, configured to acquire a frequency corresponding to the real-time distance as a second frequency according to the known correspondence between distance and frequency;

A control mode selection unit, used to compare the real-time indoor ambient temperature with the set comfort temperature, and output the comparison result as a control mode selection signal;

The first control unit is configured to select the higher of the first frequency and the second frequency when the comparison result output by the control mode selection unit is that the real-time indoor ambient temperature is not less than the set comfort temperature. The small value is used as the target frequency, and the compressor operation of the air conditioner is controlled according to the target frequency;

The second control unit is configured to compare the real-time coil temperature with the set coil target temperature when the comparison result output by the control mode selection unit is that the real-time indoor ambient temperature is lower than the set comfort temperature ; If the real-time coil temperature is greater than the set coil target temperature, select the smaller value of the first frequency and the second frequency as the target frequency, and control the compressor operation of the air conditioner according to the target frequency ; If the real-time coil temperature is not greater than the set coil target temperature, reduce the current operating frequency of the compressor to obtain a third frequency, and select the first frequency, the second frequency and the third frequency The smaller value among is used as the target frequency, and the compressor operation of the air conditioner is controlled according to the target frequency.

Compared with prior art, advantage and positive effect of the present invention are:

In the present invention, when controlling the frequency of the compressor of the inverter air conditioner, the cooperation between the temperature factor and the distance factor between the heat source and the air conditioner is considered comprehensively, and the energy-saving operation and comfortable air supply of the air conditioner are realized. Moreover, in the control of the frequency of the compressor considering the temperature factor, according to the size of the indoor ambient temperature and the set comfortable temperature, choose to use room temperature PID control or fuzzy control based on the temperature of the evaporator coil, which can be timely and timely when the room temperature is high. Cool down the room quickly to achieve the purpose of cooling, and can stabilize the coil temperature at the target temperature of the coil, making the temperature of the air outlet of the air conditioner comfortable, and achieving a comfortable cooling effect that the air is cool but not cold.

Other characteristics and advantages of the present invention will become clearer after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the flow chart of an embodiment of frequency control method of frequency conversion air conditioner of the present invention;

Fig. 2 is a structural block diagram of an embodiment of the inverter air conditioner frequency control device of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 1 , which is a flow chart of an embodiment of the method for controlling the frequency of an inverter air conditioner according to the present invention.

As shown in Figure 1, the method for realizing the frequency control of the frequency conversion air conditioner in this embodiment is realized by a process with the following steps:

Step 11: The air conditioner operates in cooling mode, obtains the real-time indoor ambient temperature, sets the indoor target temperature, and at the same time, detects the heat source in the room where the air conditioner is located in real time and determines the real-time distance between the heat source and the air conditioner.

Specifically, when the air conditioner is turned on and running, the indoor ambient temperature of the room where the air conditioner is located is detected in real time, and the real-time detected temperature is used as the real-time indoor ambient temperature. The so-called real-time indoor ambient temperature refers to the indoor ambient temperature that is continuously acquired and updated according to the set temperature sampling frequency after the air conditioner is turned on and running. Acquisition of the real-time indoor ambient temperature may be implemented using existing technologies. For example, by detecting the inlet air temperature through a temperature sensor installed at or near the air inlet of the air conditioner, the main control board of the air conditioner acquires the inlet air temperature by collecting and processing the output signal of the temperature sensor, and uses the temperature as Real-time indoor ambient temperature.

The set indoor target temperature refers to the target temperature that the indoor environment can achieve. The set indoor target temperature can be a temperature value input by the user through the remote control or the air conditioner control terminal or the air conditioner panel, or it can be the temperature value entered by the air conditioner main control board. A setpoint that is automatically recalled. No matter which method is used to set the temperature value, it can be obtained by the main control board of the air conditioner.

After the air conditioner is turned on and running, in addition to real-time detection of the real-time indoor ambient temperature of the room where the air conditioner is located, it is also necessary to detect the heat source in the room where the air conditioner is located and determine the real-time distance between the heat source and the air conditioner. The so-called real-time distance refers to the distance between the indoor heat source and the air conditioner that is continuously acquired and updated according to the set sampling frequency after the air conditioner is turned on and running. The detection of the heat source and the determination of the distance between the heat source and the air conditioner can be realized by using existing technologies. For example, by setting an infrared array sensor or a common infrared sensor on the air conditioner, combined with a certain algorithm to calculate.

As a preferred embodiment, the heat source in the room where the air conditioner is located is detected and the real-time distance between the heat source and the air conditioner is determined, and the following technical means are used to obtain it, specifically including:

Control the infrared sensor in the air conditioner to perform rotational scanning, obtain the temperature information within the scanning range, and obtain the heat source temperature curve according to the temperature information.

Specifically, an infrared sensor and a rotating mechanism may be provided on the air conditioner, and the controller of the air conditioner controls the rotating mechanism to drive the infrared sensor to rotate within a relatively large angle range. The rotating infrared sensor scans the area within the scanning angle range, and collects the temperature information of the scanning area in real time. The temperature information reflects the radiation intensity of objects within the scanning range currently collected by the infrared sensor. The stronger the radiation intensity, the higher the temperature value collected by the infrared sensor. Therefore, during the scanning process of the infrared sensor, from before scanning to the heat source to the center of the heat source and then after scanning to the heat source, the temperature value sampled by the infrared sensor is a process from low to high and then to low. heat source process. The air conditioner receives the temperature information sampled by the infrared sensor, and generates the temperature curve of the indoor heat source by analyzing the temperature information collected by the infrared sensor, that is, the radiation intensity.

The infrared sensor is driven to rotate through the rotating structure, so only a single-point infrared sensor is needed to realize the temperature scanning of the entire spatial range, and the array infrared sensor is not required. The data processing is relatively simple and takes a short time.

Then, the heat source in the room where the air conditioner is located and the real-time distance between the heat source and the air conditioner are determined according to the heat source temperature curve.

Specifically, the air conditioner can judge the number of heat sources in the current environment by analyzing the peak value in the temperature curve, which corresponds to the radiation intensity of the heat source. The coordinate value of the peak value is the coordinate value of the heat source, that is, the position . Moreover, the temperature value sampled by the infrared sensor is related to the distance of the object. The farther the object is from the air conditioner, the lower the temperature value collected by the infrared sensor is, and vice versa, the closer to the real temperature value of the object. Specifically, the distance between the heat source and the air conditioner can be determined according to the difference between the highest temperature value and the lowest temperature value in the temperature curve, and the distance between the heat source and the air conditioner can be determined according to the difference between the maximum and minimum temperature values collected by the infrared sensor during the scanning cycle. The smaller the difference between the currently scanned heat source and the background, the smaller the difference, indicating that the heat source is closer to the background, that is, the heat source is farther away from the air conditioner.

Step 12: Calculate the temperature difference between the real-time indoor ambient temperature and the set indoor target temperature as the real-time indoor temperature difference, perform room temperature PID calculations according to the real-time indoor temperature difference, and obtain the first frequency; obtain and The frequency corresponding to the real-time distance is used as the second frequency.

After the main control board acquires the real-time indoor ambient temperature and the set indoor target temperature, it calculates the temperature difference between them as the real-time indoor temperature difference. Then, room temperature PID calculation is performed according to the real-time indoor temperature difference to obtain a frequency for controlling the compressor, and this frequency is defined as the first frequency. Wherein, the specific method of performing room temperature PID calculation according to the temperature difference to obtain the target frequency for controlling the compressor can be realized by using the existing technology, and will not be elaborated and limited here.

At the same time, the frequency corresponding to the real-time distance is also obtained as the second frequency according to the known correspondence between the distance and the frequency.

Specifically, the corresponding relationship between distance and frequency is pre-stored in the memory of the main control board of the air conditioner, wherein the distance refers to the distance between the indoor heat source and the air conditioner, and the frequency refers to the operating frequency of the compressor. Preferably, the corresponding relationship between distance and frequency is obtained by R&D personnel under the guidance of theory and through a large number of air-conditioning operation simulation experiments, which can take into account the air-conditioning comfort and energy-saving performance of the air-conditioning as much as possible. Moreover, there is a positive correlation between distance and frequency. That is, the smaller the distance, the lower the frequency; and vice versa. Moreover, the correspondence between the distance and the frequency may be a relationship calculated through a specific calculation method, or may be a one-to-one relationship in the form of a table. If the calculation is performed by a calculation method, the calculation method is stored in advance, and after the real-time distance is obtained, the frequency corresponding to the real-time distance is calculated according to the real-time distance and the calculation method and used as the second frequency. And if it is a one-to-one correspondence relationship formed in the form of a table, after the real-time distance is obtained, the frequency corresponding to the real-time distance can be read out according to the real-time distance by means of table lookup and used as the second frequency. The starting point for establishing the corresponding relationship between distance and frequency is that the distance between the heat source and the air conditioner is different, and the requirements for the outlet air temperature are different. In cooling mode, in order to enable the air conditioner to provide the most reasonable air outlet comfort for the heat source, when the distance between the heat source and the air conditioner is small, it is desired to increase the outlet air temperature to avoid discomfort caused by too low temperature wind blowing to the heat source. The frequency of the machine is limited. After the frequency limit, the temperature of the outlet air can be increased, and the energy consumption can also be reduced.

Step 13: Determine whether the real-time indoor ambient temperature is lower than the set comfortable temperature. If yes, go to step 15; if not, go to step 14.

This step can be performed at the same time as step 12, and it is divided into two steps here only to express the control process of this embodiment more clearly. After obtaining the real-time indoor ambient temperature in step 11, compare the real-time indoor ambient temperature with the set comfort temperature, and judge whether the real-time indoor ambient temperature is lower than the set comfortable temperature, so as to execute the control of step 14 or step 15 according to the comparison result. Wherein, the set comfortable temperature may be a default set temperature of the air conditioner when leaving the factory, or may be a set temperature selected and set by the user. If it is set by the user, the air conditioner can give a reference temperature value for the user's reference. For example, it is recommended to set the comfort temperature as 27°C.

Step 14: If it is determined in step 13 that the real-time indoor ambient temperature is not less than the set comfort temperature, then perform the following first control: select the smaller value of the first frequency and the second frequency as the target frequency, and control the compression of the air conditioner according to the target frequency machine running.

If the real-time indoor ambient temperature is not lower than the set comfortable temperature, it indicates that the indoor temperature is high at this time and needs to be cooled quickly. In this case, compare the first frequency and the second frequency obtained in step 12, select the smaller value of the two as the target frequency, and control the operation of the compressor of the air conditioner according to the target frequency.

Step 15: If it is determined in step 13 that the real-time indoor ambient temperature is lower than the set comfort temperature, then perform the following second control: obtain the real-time coil temperature of the air conditioner evaporator and compare it with the set coil target temperature; Tube target temperature, select the smaller value of the first frequency and the second frequency as the target frequency; if it is not greater than the set coil target temperature, reduce the current operating frequency of the compressor to obtain the third frequency, select the first frequency, the second frequency The smaller value of the second frequency and the third frequency is used as the target frequency; the operation of the compressor of the air conditioner is controlled according to the target frequency.

If it is determined in step 13 that the indoor temperature is lower than the comfortable temperature, in order to avoid excessive temperature drop and cause discomfort, further consider the temperature of the evaporator coil to adjust the operating frequency of the compressor in time so that the temperature of the evaporator coil can be stabilized to the target temperature of the coil , to adjust the air outlet temperature of the air conditioner to achieve a comfortable air outlet effect that is cool but not cold.

Specifically, firstly, the real-time coil temperature and the set coil target temperature of the air conditioner evaporator are obtained, and the real-time coil temperature is compared with the set coil target temperature to determine whether the real-time coil temperature is greater than the set coil temperature. target temperature. Wherein, the detection of the coil temperature of the evaporator can be performed by setting a coil temperature sensor on the evaporator. The set target temperature of the coil can be a default set temperature of the air conditioner when it leaves the factory, and of course it can also be a set temperature selected and set by the user. If it is set by the user, since the user's concept of coil temperature and the performance index it represents are not very clear, it is preferable for the air conditioner to provide a reference temperature value for the user to refer to and select. For example, it is recommended to set the coil target temperature to 14°C.

If the real-time coil temperature is greater than the set coil target temperature, it means that the air outlet temperature of the air conditioner will not be low. Therefore, the adjustment of room temperature is taken as the main target of temperature adjustment, and the smaller value of the first frequency and the second frequency is selected as the target. Frequency, to control the operation of the compressor of the air conditioner according to the target frequency. However, if the real-time coil temperature is not higher than the set coil target, it indicates that the coil temperature is low at this time, which may easily cause the air temperature of the air conditioner to be low and send cold air. To solve this problem, the current operating frequency of the compressor is lowered to obtain a third frequency. Then, the smaller value among the first frequency, the second frequency and the third frequency is selected as the target frequency, and the operation of the compressor of the air conditioner is controlled according to the target frequency.

The frequency of the air conditioner compressor is controlled by the above method, and the cooperation between the temperature factor and the distance factor between the heat source and the air conditioner is considered comprehensively, and the energy-saving operation and comfortable air supply of the air conditioner are realized. In addition, in the control of the frequency of the compressor by the temperature factor, according to the size of the indoor ambient temperature and the set comfortable temperature, choose to use room temperature PID control or fuzzy control based on the temperature of the evaporator coil. Cool down the room quickly to achieve the purpose of cooling, and can stabilize the coil temperature at the target temperature of the coil, making the temperature of the air outlet of the air conditioner comfortable, and achieving a comfortable cooling effect that the air is cool but not cold.

It should be noted that when the fuzzy control in the second control process is executed, the real-time indoor ambient temperature is still continuously obtained and compared with the set comfort temperature. Once the real-time indoor ambient temperature is not less than the set comfort temperature, exit the second control process and transfer to the first control process.

As a preferred embodiment, a set maximum frequency is pre-stored in the memory of the main control board of the air conditioner. If step 14 determines that the smaller value of the first frequency and the second frequency is greater than the set maximum frequency, or step 15 determines that the first frequency If the smaller value among the frequency, the second frequency and the third frequency is greater than the set maximum frequency, then the set maximum frequency is taken as the target frequency. That is to say, no matter which frequency is used to control the compressor, it is ensured that the operating frequency of the compressor does not exceed the set maximum frequency.

As a preferred embodiment, for the second control, the following control process can also be included:

If it is determined that the real-time coil temperature is not greater than the set coil target temperature, then determine whether it is not greater than the first time after starting up, and perform different processing according to the determination result.

Specifically, if the real-time coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the third frequency is the set cooling minimum frequency; if the real-time coil temperature is not greater than the set coil temperature for the first time after the air conditioner is turned on Target temperature, the third frequency is between the current operating frequency and the cooling minimum frequency. Wherein, the cooling minimum frequency is a set minimum frequency during the cooling operation of the air conditioner. Generally, the minimum cooling frequency is a parameter set before the air conditioner leaves the factory.

That is, if the real-time coil temperature is not greater than the set coil target temperature for the first time after starting up, read the current operating frequency of the compressor, and then select the third frequency to be between the current operating frequency and the cooling minimum frequency A frequency value of .

The purpose of this treatment is that if the real-time coil temperature is not higher than the set coil target temperature for the first time, in order to avoid the decrease of the air outlet temperature of the air conditioner and cause the outlet air to be cold air, first limit the frequency of the compressor to make the coil temperature as soon as possible. Ramp to set coil target temperature. And if the real-time coil temperature is not greater than the set coil target temperature for the first time, it shows that the fuzzy control of the second control process has been executed, and the coil temperature will not be too lower than the set coil target temperature. At this time, the third The frequency is not necessarily lowered to the minimum, but between the current operating frequency and the minimum cooling frequency to take into account the speed of room temperature adjustment.

For the determination of the third frequency when the real-time coil temperature is not greater than the set coil target temperature for the first time after starting up, there are many methods, and the following methods are preferably used:

Obtain the current operating frequency of the compressor, and reduce the current operating frequency to the set adjustment frequency every set adjustment time, and the reduced frequency is the third frequency.

Wherein, the set adjustment frequency is a frequency value preset before leaving the factory of the air conditioner, or a frequency value set by the user, for example, it is set to 5 Hz. The frequency value is used as a frequency adjustment step, which means the reduction range of the current operating frequency each time. Moreover, the reduction of the frequency adopts the method of reducing once every set adjustment time to realize gradual adjustment.

As a more preferred embodiment, after each time the current operating frequency is lowered to the set adjustment frequency as the third frequency, it is first determined whether the difference between the set coil target temperature and the real-time coil temperature is not less than the set overshoot temperature value. If so, continue to execute the process of reducing the current operating frequency to the set adjustment frequency as the third standard frequency after the set adjustment time arrives; otherwise, keep the third frequency unchanged. Wherein, the overshoot temperature value is also a set temperature value, for example, set to 1°C.

The advantage of adopting the above processing is that if it is determined that the difference between the set coil target temperature and the real-time coil temperature is greater than the overshoot temperature value, it indicates that the coil temperature is far lower than the set coil target temperature, and further frequency reduction is still required. Moreover, as mentioned above, the frequency reduction process reduces the interval setting adjustment time by one time. The adjustment time is also a pre-set value, indicating the interval time of frequency adjustment. For example, it can be set to 2 minutes. That is, after one adjustment, the adjusted frequency is firstly used as the third frequency, and when the adjustment time is not reached, the third frequency is kept unchanged. After the adjustment time arrives, read the current operating frequency of the compressor, and continue to adjust the frequency to reduce the frequency based on the current operating frequency.

And if the step determines that the difference between the set coil target temperature and the real-time coil temperature is not greater than the overshoot temperature value, it indicates that the coil temperature has not yet reached the set coil target temperature, but the difference between the set coil target temperature is relatively small. Small, not greater than the overshoot temperature value. At this time, the frequency will not be reduced to avoid overshoot of the coil temperature and affect the room temperature adjustment speed. Therefore, the third frequency remains unchanged.

Please refer to FIG. 2 , which shows a structural block diagram of an embodiment of an inverter air conditioner frequency control device according to the present invention.

As shown in Figure 2, the structural units and their functions included in the inverter air conditioner frequency control device of this embodiment are as follows:

The indoor environment temperature acquiring unit 201 is configured to acquire real-time indoor environment temperature.

The room temperature PID operation unit 202 is used to calculate the temperature difference between the real-time indoor ambient temperature acquired by the indoor environment temperature acquisition unit 201 and the set indoor target temperature as the real-time indoor temperature difference, and perform PID calculation according to the real-time indoor temperature difference to obtain and output the first frequency.

The coil temperature obtaining unit 203 is configured to obtain the real-time coil temperature of the air conditioner evaporator.

The heat source determination and distance acquisition unit 204 is configured to detect the heat source in the room where the air conditioner is located in real time and determine the real-time distance between the heat source and the air conditioner.

The second frequency obtaining unit 205 is configured to obtain a frequency corresponding to the real-time distance as the second frequency according to the known correspondence between distance and frequency.

The control mode selection unit 206 is configured to compare the real-time indoor ambient temperature acquired by the indoor ambient temperature acquisition unit 201 with the set comfortable temperature, and output the comparison result as a control mode selection signal.

The first control unit 207 is used to select the first frequency output by the room temperature PID calculation unit 202 and the second frequency output by the acquisition unit 205 when the comparison result output by the control mode selection unit 206 is that the real-time indoor ambient temperature is not less than the set comfort temperature. The smaller value of the second frequency is used as the target frequency, and the operation of the compressor of the air conditioner is controlled according to the target frequency.

The second control unit 208 is configured to compare the real-time coil temperature with the set coil target temperature when the comparison result output by the control mode selection unit 206 is that the real-time indoor ambient temperature is lower than the set comfort temperature. If the real-time coil temperature is higher than the set coil target temperature, select the smaller value of the first frequency and the second frequency as the target frequency, and control the operation of the compressor of the air conditioner according to the target frequency; if the real-time coil temperature is not higher than the set coil temperature Control the target temperature, reduce the current operating frequency of the compressor to obtain the third frequency, select the smaller value among the first frequency, the second frequency and the third frequency as the target frequency, and control the operation of the compressor of the air conditioner according to the target frequency.

The heat source determination and distance acquisition unit 204 can be realized by adopting a structure capable of detecting heat sources and determining the distance in the prior art. As a preferred implementation manner, the heat source determination and distance acquisition unit 204 is implemented using the following structure:

include:

Infrared sensor, set in the air conditioner;

The rotating mechanism is used to drive the infrared sensor to rotate;

The heat source determination and distance acquisition subunit is used to obtain temperature information within the scanning range of the infrared sensor, obtain the heat source temperature curve according to the temperature information, and determine the heat source in the room where the air conditioner is located and the real-time distance between the heat source and the air conditioner according to the heat source temperature curve.

Each structural unit in the above-mentioned device runs a corresponding software program, and performs the frequency control of the inverter air conditioner according to the flow chart in Figure 1, so as to realize the energy-saving and comfortable operation of the inverter air conditioner.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still understand the foregoing embodiments. Modifications are made to the technical solutions described, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed in the present invention.

Claims (9)

1. A frequency control method for an inverter air conditioner, characterized in that the method comprises: Air conditioner cooling operation, obtain the real-time indoor ambient temperature and set indoor target temperature, calculate the temperature difference between the real-time indoor ambient temperature and the set indoor target temperature, as the real-time indoor temperature difference, and perform room temperature PID according to the real-time indoor temperature difference Calculate and obtain the first frequency; detect the heat source in the room where the air conditioner is located in real time and determine the real-time distance between the heat source and the air conditioner, and obtain the frequency corresponding to the real-time distance according to the known correspondence between the distance and the frequency, as the second frequency; Comparing the real-time indoor ambient temperature with the set comfort temperature; If the real-time indoor ambient temperature is not less than the set comfort temperature, perform the following first control: select the smaller value of the first frequency and the second frequency to control the compressor operation of the air conditioner; If the real-time indoor ambient temperature is lower than the set comfort temperature, perform the following second control: obtain the real-time coil temperature of the air conditioner evaporator, and compare the real-time coil temperature with the set coil target temperature; If the real-time coil temperature is greater than the set coil target temperature, select the smaller value of the first frequency and the second frequency as the target frequency, and control the operation of the compressor of the air conditioner according to the target frequency; If the real-time coil temperature is not greater than the set coil target temperature, reduce the current operating frequency of the compressor to obtain a third frequency, and select the first frequency, the second frequency and the third frequency A smaller value controls the compressor operation of the air conditioner. 2. The method according to claim 1, wherein the correspondence between the distance and the frequency is a positive correlation. 3. The method according to claim 1, wherein the detecting the heat source in the room where the air conditioner is located and determining the real-time distance between the heat source and the air conditioner specifically comprises: Control the infrared sensor in the air conditioner to scan to rotate, obtain the temperature information within the scanning range, and obtain the temperature curve of the heat source according to the temperature information; A heat source in the room where the air conditioner is located and a real-time distance between the heat source and the air conditioner are determined according to the heat source temperature curve. 4. The method according to claim 1, wherein if the smaller value of the first frequency and the second frequency or the first frequency, the second frequency and the third frequency If the smaller value is greater than the set maximum frequency, then the set maximum frequency is used as the target frequency, and the operation of the compressor of the air conditioner is controlled according to the target frequency. 5. The method according to any one of claims 1 to 4, wherein if the real-time coil temperature is not greater than the set coil target temperature for the first time after the air conditioner is turned on, the third frequency is Set the cooling minimum frequency; if the real-time coil temperature is not greater than the set coil target temperature not for the first time after the air conditioner is turned on, the third frequency is between the current operating frequency and the cooling minimum frequency between. 6. The method according to claim 5, wherein if the real-time coil temperature is not greater than the set coil target temperature not for the first time after the air conditioner is turned on, the third frequency adopts the following method Sure: The current operating frequency of the compressor is obtained, and the current operating frequency is lowered by the set adjustment frequency every set adjustment time, and the lowered frequency is the third frequency. 7. The method according to claim 6, characterized in that, each time the current operating frequency is lowered by the set adjustment frequency as the third frequency, the relationship between the set coil target temperature and the set coil temperature is first judged. Whether the difference of the real-time coil temperature is not less than the set overshoot temperature value; if so, continue to reduce the current operating frequency to the set adjustment frequency as the third frequency after the set adjustment time arrives otherwise, keep the third frequency unchanged. 8. A frequency control device for an inverter air conditioner, characterized in that the device comprises: Indoor ambient temperature acquisition unit, used to obtain real-time indoor ambient temperature; The coil temperature acquisition unit is used to acquire the real-time coil temperature of the air conditioner evaporator; A room temperature PID calculation unit, used to calculate the temperature difference between the real-time indoor ambient temperature and the set indoor target temperature as the real-time indoor temperature difference, perform PID calculation according to the real-time indoor temperature difference, and obtain and output the first frequency; The heat source determination and distance acquisition unit is used to detect the heat source in the room where the air conditioner is located in real time and determine the real-time distance between the heat source and the air conditioner; A second frequency acquiring unit, configured to acquire a frequency corresponding to the real-time distance as a second frequency according to the known correspondence between distance and frequency; A control mode selection unit, used to compare the real-time indoor ambient temperature with the set comfort temperature, and output the comparison result as a control mode selection signal; The first control unit is configured to select the higher of the first frequency and the second frequency when the comparison result output by the control mode selection unit is that the real-time indoor ambient temperature is not less than the set comfort temperature. The small value controls the compressor operation of the air conditioner; The second control unit is configured to compare the real-time coil temperature with the set coil target temperature when the comparison result output by the control mode selection unit is that the real-time indoor ambient temperature is lower than the set comfort temperature ; If the real-time coil temperature is greater than the set coil target temperature, select the smaller value of the first frequency and the second frequency as the target frequency, and control the compressor operation of the air conditioner according to the target frequency ; If the real-time coil temperature is not greater than the set coil target temperature, reduce the current operating frequency of the compressor to obtain a third frequency, and select the first frequency, the second frequency and the third frequency The smaller value in controls the compressor operation of the air conditioner. 9. The device according to claim 8, wherein the heat source determination and distance acquisition unit comprises: Infrared sensor, set in the air conditioner; a rotating mechanism for driving the infrared sensor to rotate; The heat source determination and distance acquisition subunit is used to obtain temperature information within the scanning range of the infrared sensor, obtain a heat source temperature curve according to the temperature information, and determine the heat source in the room where the air conditioner is located and the heat source and air conditioner according to the heat source temperature curve real-time distance between.