An air conditioner indoor unit automatic defrosting control method

Abstract

The application belongs to the technical field of air conditioner control, and particularly relates to an air conditioner indoor unit automatic defrosting control method. The method comprises the following steps: continuously monitoring indoor temperature and compressor working on time, starting the compressor and entering indoor refrigeration mode when the indoor temperature and the compressor shutdown time are monitored; closing the compressor and exiting the indoor refrigeration mode when the indoor temperature and the continuous compressor on time are monitored; configuring a defrosting controller for starting a defrosting program; and configuring a defrosting mode controller for controlling the defrosting mode. The air conditioner indoor unit automatic defrosting control method can effectively avoid the defrosting capacity of the air conditioner indoor unit under the environment of long-time continuous refrigeration and high humidity, effectively avoid the frost development of the air conditioner indoor unit in the inhibition process, and ensure the performance of the air conditioner.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning control technology, and in particular relates to an automatic defrosting control method for an indoor unit of an air conditioner. Background Technology

[0002] Most air conditioner outdoor units have an automatic defrosting function, but indoor units do not. This is because, under normal circumstances, indoor units are not prone to frost formation. However, in environments such as restaurants and kitchens, where continuous cooling demand is high and humidity is high, frost can easily form on the indoor unit. This results in ice and frost covering the condenser surface, causing blockage of the air outlet, reduced airflow efficiency, and ice falling off. This not only affects the user experience but also increases energy consumption and reduces cooling efficiency, making conventional air conditioning units perform poorly in these scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide a system that, based on practical needs, can provide a system for continuous cooling over long periods of time, effectively prevent the indoor unit of an air conditioner from frosting in environments with high humidity, and ensure the stable operation of the air conditioning equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] An automatic defrosting control method for an air conditioner indoor unit includes the following steps: continuously monitoring the indoor temperature. And the compressor's operating time, when the indoor temperature is monitored. And the compressor shutdown time The compressor will then start, entering indoor cooling mode; when the indoor temperature is monitored... And the compressor's continuous running time If the compressor is turned off, the indoor cooling mode will be exited; For the set indoor temperature, To control the temperature difference in the room, This is the minimum start-up cycle for the compressor. This refers to the minimum start-up time of the compressor;

[0006] Configure the defrost controller to start the defrost program; configure the defrost mode controller to control the defrost mode.

[0007] The air conditioner defrosting control is completed based on the following steps:

[0008] A0. Determine the status of the defrost mode controller. If it is in timed defrost mode, proceed to step A1; if it is in active defrost mode, proceed to step A2; if it is in intelligent defrost mode, proceed to step A3.

[0009] A1. Check the defrost controller status. If it is in defrost mode, turn off the compressor and start the defrost process. If it is in the off state, check the compressor's on state and go to step A11. If the compressor is not on, return to step A0.

[0010] A11. If the compressor runs continuously for a long time If the condition is met, the compressor is turned off, the defrost mode controller status is marked as defrost, and the process returns to step A1; otherwise, the process directly returns to step A1. This refers to the preset defrosting cycle;

[0011] A2. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor and start the defrost process. If it is in the off state, check the compressor's on state and proceed to step A21. If the compressor is not on, return to step A0.

[0012] A21. If the compressor is continuously running for a long time Mark the defrost controller to defrost mode and return to step A2, where The preset active defrosting cycle is used; if the compressor is continuously running for a certain period of time... If so, monitor the air conditioner outlet temperature and proceed to step A22;

[0013] A22. If the air conditioner outlet temperature If the condition is met, the defrost controller status will be marked as defrost, and the process will return to step A2; otherwise, the process will directly return to step A2. This refers to the evaporation temperature at the current room temperature;

[0014] A3. Determine the status of the defrost mode controller after the air conditioner is turned on that day. If it is the first time entering the intelligent defrost mode or the intelligent controller is in the initialization state, proceed to step A30; if the intelligent controller is in the intelligent state, proceed to step A31.

[0015] A30. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor, start the defrost process, and proceed to step A31; otherwise, monitor the outlet air temperature. Indoor temperature and compressor running time ;

[0016] If the continuous power-on time And the temperature of the air conditioner vent If the compressor is turned off, the defrosting process will begin; proceed to step A3; if the continuous running time is... And indoor temperature If the compressor fails, start the defrosting process and proceed to step A3; otherwise, proceed directly to step A3.

[0017] A31. Monitor the compressor's running time since the last defrost. ,like Then the standby timer will continue until... Detect the temperature of the air conditioner outlet. ,like Standby until And activate intelligent defrosting.

[0018] In a further improvement or preferred embodiment of the aforementioned automatic defrosting control method for indoor air conditioning units, the parameters of the intelligent defrosting mode are determined based on the following method:

[0019] S1 collects and analyzes air conditioner indoor unit frost test data through actual machine testing. The test data includes the air conditioner's indication values ​​under different frost conditions, as well as the air outlet temperature and evaporator temperature under the corresponding conditions; and establishes a sample database.

[0020] S2. Use kernel functions to convert the original data into high-dimensional feature vectors; thus obtaining the sample set. ;

[0021] in This refers to the frosting status indicator in the r-th data point. This refers to the characteristic quantity of the air conditioner outlet temperature in the r-th data point. This refers to the characteristic quantity of the air conditioner evaporator temperature in the r-th data point. ;

[0022] The sample set is split into a training dataset and a test dataset;

[0023] S3. Establish an intelligent defrosting model based on support vector machine network, and define the classification hyperplane for air conditioner frost data samples. ;in It refers to the plane normal vector. This refers to the hyperplane displacement term;

[0024] Define the interval function For a certain frosting state If sample data Corresponding state If it matches, then This indicates that the parameters corresponding to the sample support this frosting state; otherwise... This indicates that we do not support it; This represents the distance between the sample point and the hyperplane;

[0025] The objective function is obtained using the Lagrange function dual multiplier method.

[0026]

[0027] in

[0028] This refers to the Lagrange dual multiplier. As a penalty factor;

[0029] S4. Solve the objective function to obtain the optimal hyperplane. Use the test sample set to check whether the model error meets the requirements. If the error is large, update the kernel function and the penalty function C, continue to calculate the optimal hyperplane, and update the intelligent defrosting model after the error is satisfied.

[0030] S5. Obtain real-time air conditioner data, input it into the intelligent defrosting model, determine the air conditioner's frost status, and take corresponding defrosting measures according to different statuses.

[0031] In a further improvement or preferred embodiment of the aforementioned automatic defrosting control method for indoor air conditioning units, the kernel function refers to the Gaussian radial basis function. ,in This refers to the loss function.

[0032] The automatic defrosting control method for indoor air conditioning units of the present invention can effectively prevent the defrosting capacity of indoor units of air conditioning and other refrigeration equipment under conditions such as long-term continuous cooling and high humidity, effectively prevent the development of frost in the indoor unit during the air conditioning suppression process, and ensure the performance of the air conditioner. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the start-up control process in the automatic defrosting control method for the indoor unit of an air conditioner;

[0034] Figure 2 This is a schematic diagram of the intelligent control startup process in the automatic defrosting control method for indoor air conditioning units. Detailed Implementation

[0035] The present invention will be described in detail below with reference to specific embodiments.

[0036] This invention relates to an automatic defrosting control method for an air conditioner indoor unit, mainly used to further expand the defrosting control function of the indoor unit based on the traditional air conditioner control mode. It mainly involves the following:

[0037] like Figure 1 As shown, indoor temperature is continuously monitored. And the compressor's operating time, when the indoor temperature is monitored. And the compressor shutdown time The compressor will then start, entering indoor cooling mode; when the indoor temperature is monitored... And the compressor's continuous running time If the compressor is turned off, the indoor cooling mode will be exited; For the set indoor temperature, To control the temperature difference in the room, This is the minimum start-up cycle for the compressor. This refers to the minimum start-up time of the compressor;

[0038] Configure the defrost controller to start the defrost program; configure the defrost mode controller to control the defrost mode.

[0039] Since frost formation is affected by various factors such as indoor temperature, indoor humidity, and current dew point temperature, the frost state will also change in various ways. Different defrosting control methods should be adopted according to different needs under different circumstances to simplify the control scheme while meeting actual defrosting needs, so as to avoid excessive defrosting frequency and affecting the daily use of air conditioner. For this reason, this application is equipped with a defrosting mode controller to control the defrosting control mode according to different factors and characteristics. This application mainly involves three modes: timed defrosting, active defrosting, and intelligent defrosting.

[0040] First, the defrost mode parameters set by the operator or during the automatic control of the air conditioner are obtained through the defrost mode controller, and the defrost process is started in conjunction with the status of the defrost controller.

[0041] The specific steps include:

[0042] A0. Determine the status of the defrost mode controller. If it is in timed defrost mode, proceed to step A1. If it is in active defrost mode, proceed to step A2. If it is in intelligent defrost mode, proceed to step A3.

[0043] Timed defrost mode:

[0044] The timed defrost mode is used when humidity is not very high and the frosting state is relatively stable, to automatically perform timed defrosting maintenance when the air conditioner is unattended for extended periods. It is the most basic defrost control mode. This mode does not require complex decision-making processes; it only needs to perform the defrosting operation while ensuring the air conditioner's normal start-stop cycle. Specific steps include:

[0045] A1. Check the defrost controller status. If it is in defrost mode, turn off the compressor and start the defrost process. If it is in the off state, check the compressor's on state and go to step A11. If the compressor is not on, return to step A0.

[0046] A11. If the compressor runs continuously for a long time If the condition is met, the compressor is turned off, the defrost mode controller status is marked as defrost, and the process returns to step A1; otherwise, the process directly returns to step A1. This refers to the preset defrosting cycle;

[0047] Active defrosting mode: Active defrosting mode is mainly designed to address the issue that in certain weather conditions, rapid changes in temperature and humidity may prevent the regular timed defrosting mode from effectively defrosting the indoor unit of the air conditioner during operation. It mainly intervenes actively when the indoor unit is prone to frost formation by detecting the operating time of the indoor unit and the air outlet temperature, thus preventing frost from forming.

[0048] A2. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor and start the defrost process. If it is in the off state, check the compressor's on state and proceed to step A21. If the compressor is not on, return to step A0.

[0049] A21. If the compressor is continuously running for a long time Mark the defrost controller to defrost mode and return to step A2, where The preset active defrosting cycle is used; if the compressor is continuously running for a certain period of time... If so, monitor the air conditioner outlet temperature and proceed to step A22;

[0050] A22. If the air conditioner outlet temperature If the condition is met, the defrost controller status will be marked as defrost, and the process will return to step A2; otherwise, the process will directly return to step A2. This refers to the evaporation temperature at the current room temperature;

[0051] like Figure 2 As shown, the intelligent defrosting mode requires initialization settings when it is first run to configure the intelligent operation mode. The intelligent defrosting mode is mainly used to further improve the intelligent defrosting effect on the basis of the basic logic of active defrosting. By performing intelligent judgment and analysis, the defrosting process of the air conditioner indoor unit is made more in line with the characteristics of the environment in which it is used, and the defrosting effect of the air conditioner indoor unit is continuously and stably maintained. It is used to provide more stable and reliable defrosting control in environments such as cold storage and specific low-temperature facilities.

[0052] A3. Determine the status of the defrost mode controller after the air conditioner is turned on that day. If it is the first time entering the intelligent defrost mode or the intelligent controller is in the initialization state, proceed to step A30; if the intelligent controller is in the intelligent state, proceed to step A31.

[0053] A30. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor, start the defrost process, and proceed to step A31; otherwise, monitor the outlet air temperature. Indoor temperature and compressor running time ;

[0054] If the continuous power-on time And the temperature of the air conditioner vent If the compressor is turned off, the defrosting process will begin; proceed to step A3; if the continuous running time is... And indoor temperature If the compressor fails, start the defrosting process and proceed to step A3; otherwise, proceed directly to step A3.

[0055] A31. Monitor the compressor's running time since the last defrost. ,like Then the standby timer will continue until... Detect the temperature of the air conditioner outlet. ,like Standby until And activate intelligent defrosting.

[0056] The parameters of the intelligent defrosting mode are determined based on the following method:

[0057] S1 collects and analyzes air conditioner indoor unit frost test data through actual machine testing. The test data includes the air conditioner's indication values ​​under different frost conditions, as well as the air outlet temperature and evaporator temperature under the corresponding conditions; and establishes a sample database.

[0058] S2. Use kernel functions to convert the original data into high-dimensional feature vectors; thus obtaining the sample set. ;

[0059] in This refers to the frosting status indicator in the r-th data point. This refers to the characteristic quantity of the air conditioner outlet temperature in the r-th data point. This refers to the characteristic quantity of the air conditioner evaporator temperature in the r-th data point. ;

[0060] The sample set is split into a training dataset and a test dataset;

[0061] S3. Establish an intelligent defrosting model based on support vector machine network, and define the classification hyperplane for air conditioner frost data samples. ;in It refers to the plane normal vector. This refers to the hyperplane displacement term;

[0062] Define the interval function For a certain frosting state If sample data Corresponding state If it matches, then This indicates that the parameters corresponding to the sample support this frosting state; otherwise... This indicates that we do not support it; This represents the distance between the sample point and the hyperplane;

[0063] The objective function is obtained using the Lagrange function dual multiplier method.

[0064]

[0065] in

[0066] This refers to the Lagrange dual multiplier. As a penalty factor;

[0067] S4. Solve the objective function to obtain the optimal hyperplane. Use the test sample set to check whether the model error meets the requirements. If the error is large, update the kernel function and the penalty function C, continue to calculate the optimal hyperplane, and update the intelligent defrosting model after the error is satisfied.

[0068] S5. Obtain real-time air conditioner data, input it into the intelligent defrosting model, determine the air conditioner's frost status, and take corresponding defrosting measures according to different statuses.

[0069] The defrosting measures include, but are not limited to, the combined use of different control modes and equipment, including but not limited to using ventilation mode to defrost using a higher external room temperature, or using electric heating, etc.

[0070] The above scheme, based on the support vector machine model for classification analysis, enables the defrosting control system to adaptively optimize according to the system parameters of the air conditioner's indoor unit. This avoids problems such as defrosting delay and unreliable defrosting found in traditional defrosting control schemes, allowing it to update and iterate as the air conditioner's indoor unit's cooling effect and other system states change. This ensures good defrosting control capabilities at different times and guarantees the long-term effectiveness of the air conditioner.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for controlling automatic defrosting of an air conditioner indoor unit, characterized in that, Continuous monitoring of indoor temperature And the compressor's operating time, when the indoor temperature is monitored. And the compressor shutdown time The compressor will then start, entering indoor cooling mode; when the indoor temperature is monitored... And the compressor's continuous running time If the compressor is turned off, the indoor cooling mode will be exited. in For the set indoor temperature, To control the temperature difference in the room, This is the minimum start-up cycle for the compressor. This refers to the minimum start-up time of the compressor; Configure the defrost controller to initiate the defrost program; configure the defrost mode controller to control the defrost mode; and complete the air conditioner defrost control based on the following steps: A0. Determine the status of the defrost mode controller. If it is in timed defrost mode, proceed to step A1; if it is in active defrost mode, proceed to step A2; if it is in intelligent defrost mode, proceed to step A3. A1. Detect the status of the defrost controller. If it is in defrost mode, shut down the compressor and start the defrost process. If the compressor is off, check its on / off status and proceed to step A11; if the compressor is not on, return to step A0. A11. If the compressor runs continuously for a long time If the condition is met, the compressor is turned off, the defrost mode controller status is marked as defrost, and the process returns to step A1; otherwise, the process directly returns to step A1. This refers to the preset defrosting cycle; A2. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor and start the defrost process. If the compressor is off, check its on / off status and proceed to step A21; if the compressor is not on, return to step A0. A21. If the compressor is continuously running for a long time Mark the defrost controller to defrost mode and return to step A2, where The preset active defrosting cycle is used; if the compressor is continuously running for a certain period of time... If so, monitor the air conditioner outlet temperature and proceed to step A22; A22. If the air conditioner outlet temperature If the condition is met, the defrost controller status will be marked as defrost, and the process will return to step A2; otherwise, the process will directly return to step A2. This refers to the evaporation temperature at the current room temperature; A3. Determine the status of the defrost mode controller after the air conditioner is turned on that day. If it is the first time entering the intelligent defrost mode or the intelligent controller is in the initialization state, proceed to step A30; if the intelligent controller is in the intelligent state, proceed to step A31. A30. Determine the status of the defrost controller. If it is in defrost mode, shut down the compressor, start the defrost process, and proceed to step A31; otherwise, monitor the outlet air temperature. Indoor temperature and compressor running time ; If the air conditioner outlet temperature If the compressor shuts down, the defrosting process will begin. Proceed to step A3; if the continuous power-on time is... And indoor temperature If the compressor shuts down, the defrosting process will begin. Proceed to step A3; otherwise, proceed directly to step A3. A31. Monitor the compressor's running time since the last defrost. ,like Then the standby timer will continue until... Detect the temperature of the air conditioner outlet. ,like Standby until And activate intelligent defrosting.

2. The automatic defrosting control method for an air conditioner indoor unit according to claim 1, characterized in that, The parameters of the intelligent defrosting mode are determined based on the following method: S1 collects and analyzes air conditioner indoor unit frost test data through actual machine testing. The test data includes the air conditioner's indication values ​​under different frost conditions, as well as the air outlet temperature and evaporator temperature under the corresponding conditions; and establishes a sample database. S2. Use kernel functions to convert the original data into high-dimensional feature vectors; thus obtaining the sample set. ; in This refers to the frosting status indicator in the r-th data point. This refers to the characteristic quantity of the air conditioner outlet temperature in the r-th data point. This refers to the characteristic quantity of the air conditioner evaporator temperature in the r-th data point. ; The sample set is split into a training dataset and a test dataset; S3. Establish an intelligent defrosting model based on support vector machine network, and define the classification hyperplane for air conditioner frost data samples. ;in It refers to the plane normal vector. This refers to the hyperplane displacement term; Define the interval function For a certain frosting state If sample data Corresponding state If it matches, then This indicates that the parameters corresponding to the sample support this frosting state; otherwise... This indicates that we do not support it; This represents the distance between the sample point and the hyperplane; The objective function is obtained using the Lagrange function dual multiplier method. in This refers to the Lagrange dual multiplier. As a penalty factor; S4. Solve the objective function to obtain the optimal hyperplane, and use the test sample set to check whether the model error meets the requirements; If the error is large, update the kernel function and penalty function C, continue to calculate the optimal hyperplane, and update the intelligent defrosting model after the error is satisfied. S5. Obtain real-time air conditioner data, input it into the intelligent defrosting model, determine the air conditioner's frost status, and take corresponding defrosting measures according to different statuses.

3. The automatic defrosting control method for an air conditioner indoor unit according to claim 2, characterized in that, The kernel function refers to the Gaussian radial basis kernel function. ,in This refers to the loss function.

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