Control Method, Device and Air Conditioner of Indoor Unit

Abstract

The present invention provides a control method, device and air conditioner for an indoor unit. The method includes: when it is determined that the cooling mode is started, obtaining a target temperature difference based on the temperature of the target area and the coil temperature; determining a target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference; and controlling the electronic expansion valve to adjust the opening based on the target opening change value. The control method, device and air conditioner for the indoor unit provided by the present invention realize the comparison of the temperature difference between the temperature near the evaporator pipe of the indoor unit and the coil temperature, adaptively adjust the opening of the indoor electronic expansion valve according to the difference value, and then maintain the thermal balance in the air duct during the process of the exhaust temperature changing accordingly, avoid a large amount of water droplets from condensing during the operation of the air conditioner, and improve the comfort and safety of user use.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method and device for an indoor unit and an air conditioner. Background Art

[0002] During the operation of an air conditioner in the cooling mode, the air inlet surface of the evaporator of the indoor unit is a high-temperature area or an overheated area, while the area near the cross-flow fan and the air outlet is a low-temperature area. Air enters from the high-temperature air inlet surface and exits from the low-temperature air outlet surface. The hot and cold air meets severely in the air duct, resulting in condensation of dew water droplets in the air duct, causing problems such as water blowing and dripping during the operation of the air conditioner, which seriously affects the comfort and safety of users. Summary of the Invention

[0003] The present invention provides a control method and device for an indoor unit and an air conditioner, aiming to solve the defect of water blowing and dripping in the prior art in the cooling mode.

[0004] The present invention provides a control method for an indoor unit, including:

[0005] When it is determined that the cooling mode is started, based on the target area temperature and the coil temperature, obtain the target temperature difference;

[0006] According to the target temperature difference sub-interval corresponding to the target temperature difference, determine the target opening change value of the electronic expansion valve;

[0007] Based on the target opening change value, control the electronic expansion valve to adjust the opening;

[0008] Wherein, the target temperature difference sub-interval is one of all temperature difference sub-intervals; each temperature difference sub-interval is preset with an opening change value; the target area temperature includes the liquid inlet pipe temperature and / or the liquid outlet pipe temperature of the evaporator.

[0009] According to the control method for an indoor unit provided by the present invention, the temperature difference sub-intervals include: a first temperature difference sub-interval, a second temperature difference sub-interval, and a third temperature difference sub-interval;

[0010] Wherein, the first opening change value corresponding to the first temperature difference sub-interval is less than 0, the second opening change value corresponding to the second temperature difference sub-interval is equal to 0, and the third opening change value corresponding to the third temperature difference sub-interval is greater than 0.

[0011] According to the control method for an indoor unit provided by the present invention, when it is determined that the target opening change value is the first opening change value, the controlling the electronic expansion valve to adjust the opening based on the target opening change value includes:

[0012] Within a preset time, based on the first opening change value, control the electronic expansion valve to reduce the opening.

[0013] According to a control method of an indoor unit provided by the present invention, at least two sub-interval segments are included in the third temperature difference sub-interval;

[0014] Wherein, a third opening change value is preset for any one of the temperature difference sub-interval segments.

[0015] According to a control method of an indoor unit provided by the present invention, when the temperature of the target area is the first temperature, the target temperature difference is the absolute value of the difference between the first temperature and the coil temperature;

[0016] Wherein, the first temperature is the temperature of the liquid inlet pipe of the evaporator.

[0017] According to a control method of an indoor unit provided by the present invention, when the temperature of the target area is the second temperature, the target temperature difference is the absolute value of the difference between the second temperature and the coil temperature;

[0018] Wherein, the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0019] According to a control method of an indoor unit provided by the present invention, when the temperature of the target area is the first temperature and the second temperature, obtaining the target temperature difference based on the temperature of the target area and the coil temperature includes:

[0020] Determining a first temperature difference and a second temperature difference based on the absolute values of the differences between the coil temperature and the first temperature and the second temperature respectively;

[0021] Determining the target temperature difference based on the first temperature difference and the second temperature difference;

[0022] Wherein, the first temperature is the temperature of the liquid inlet pipe of the evaporator, and the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0023] The present invention also provides a control device for an indoor unit, including:

[0024] A temperature difference acquisition module, configured to obtain a target temperature difference based on the temperature of the target area and the coil temperature when it is determined that the cooling mode is started;

[0025] An opening determination module, configured to determine a target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference;

[0026] A control module, configured to control the electronic expansion valve to adjust the opening based on the target opening change value;

[0027] Among them, the target temperature difference sub-interval is one of all the temperature difference sub-intervals; each of the temperature difference sub-intervals is preset with an opening change value; the target area temperature includes the temperature of the liquid inlet pipe and / or the liquid outlet pipe of the evaporator.

[0028] The present invention also provides an air conditioner, including an indoor unit and an outdoor unit. A control processor and a sensing module are arranged in the indoor unit, and the sensing module is arranged on the evaporator of the indoor unit; it also includes a memory and a program or instruction stored on the memory and executable on the control processor. When the program or instruction is executed by the control processor, it executes the control method of the indoor unit as described above.

[0029] Among them, the sensing module includes a first sensor and / or a second sensor. The first sensor is arranged on the liquid inlet pipe of the evaporator, and the second sensor is arranged on the liquid outlet pipe of the evaporator.

[0030] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method of the indoor unit as described in any one of the above.

[0031] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the control method of the indoor unit as described in any one of the above.

[0032] The control method, device and air conditioner of the indoor unit provided by the present invention obtain a target temperature difference between the target area temperature obtained in real time and the coil temperature, and determine the target temperature difference sub-interval corresponding to the target temperature difference, so that the electronic expansion valve is adjusted in combination with the target opening change value corresponding to this interval. It realizes the comparison of the temperature difference between the temperature near the evaporation pipe of the indoor unit and the coil temperature, adaptively adjusts the opening of the electronic expansion valve of the room according to the difference value, and then maintains the thermal balance in the air duct during the process of the exhaust temperature changing accordingly, avoids a large amount of water droplets from condensing when the air conditioner operates, and improves the comfort and safety of user use. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0034] Figure 1 It is a schematic flowchart of the control method of the indoor unit provided by the present invention;

[0035] Figure 2It is a schematic structural diagram of the control device of the indoor unit provided by the present invention;

[0036] Figure 3 It is a schematic structural diagram of the air conditioner provided by the present invention. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0038] The terms "first", "second", etc. in this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category and do not limit the number of objects. For example, the first object can be one or multiple.

[0039] It should be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present invention, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0040] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0041] Figure 1 It is a schematic flowchart of the control method of the indoor unit provided by the present invention. As Figure 1 shown, the control method of the indoor unit provided by the embodiment of the present invention includes: Step 101, when it is determined that the cooling mode is started, obtain a target temperature difference based on the target area temperature and the coil temperature.

[0042] Among them, the target area temperature includes the liquid inlet pipe temperature and / or the liquid outlet pipe temperature of the evaporator.

[0043] It should be noted that the execution subject of the control method of the indoor unit provided by the embodiment of the present invention is the control device of the indoor unit.

[0044] The application scenario of the control method for the indoor unit provided by the embodiments of the present invention is that after the user activates the cooling mode of the air conditioning system, the temperature of the internal components of the indoor unit is analyzed based on the real-time feedback of the sensing module to analyze the internal heat and cold load conditions, so as to adaptively adjust the valve in the indoor unit and prevent the phenomenon of heat and cold intersection in the indoor unit by changing the exhaust temperature.

[0045] Among them, at specified time intervals, the sensing module periodically aligns with a specified position of the evaporator in the indoor unit to collect the temperature of the target area, and sends the temperature of the target area to the control device of the indoor unit. The embodiments of the present invention do not specifically limit the working cycle of the sensing module.

[0046] Optionally, the sensing module can perform the acquisition operation with the default working cycle.

[0047] Optionally, the user can send a cycle change instruction, so that the sensing module accepts and responds to the instruction, and changes the working cycle to the cycle indicated by the instruction for the acquisition operation.

[0048] It should be noted that before step 101, the user needs to send an activation instruction through the transmission medium to activate the cooling mode of the air conditioner, so that the indoor unit of the air conditioner operates at the default wind speed of this mode, while the outdoor unit operates at the default frequency of this mode.

[0049] Optionally, the user can use the wireless communication method between the control device and the air conditioner through the control device to transmit the activation instruction to initialize the cooling mode of the air conditioning system.

[0050] Optionally, the user can send an activation instruction through voice interaction. After the air conditioner receives the activation instruction and performs voice recognition, it initializes the cooling mode.

[0051] Specifically, in step 101, when the control device of the air conditioner receives and responds to the operation status information fed back by the air conditioner and determines that the current operating mode is the cooling mode, it uses the temperature of the target area collected by the sensing module during the current working cycle and combines the coil temperature fed back by the coil temperature sensor to calculate the temperature difference and obtain the target temperature difference.

[0052] It can be understood that the embodiments of the present invention do not specifically limit the number of temperature sensors in the sensing module.

[0053] Optionally, the sensing module can at least include a set of temperature sensors arranged on the liquid inlet pipe or the liquid outlet pipe of the evaporator, and the temperature of the target area currently collected by this set of temperature sensors obtained by the control device of the air conditioner corresponds to the liquid inlet pipe temperature or the liquid outlet pipe temperature.

[0054] Optionally, the sensing module may at least include two groups of temperature sensors respectively arranged on the liquid inlet pipe or the liquid outlet pipe of the evaporator, and the target area temperatures currently collected by each group of temperature sensors obtained by the control device of the air conditioner correspond to the liquid inlet pipe temperature and the liquid outlet pipe temperature respectively.

[0055] Step 102: Determine the target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference.

[0056] Wherein, the target temperature difference sub-interval is one of all the temperature difference sub-intervals; each temperature difference sub-interval is preset with an opening change value.

[0057] It should be noted that before step 102, N continuous temperature difference sub-intervals need to be divided between the upper limit and the lower limit of the target temperature difference to quantify different temperature difference levels.

[0058] Correspondingly, N opening change values also need to be correspondingly divided for the opening of the electronic expansion valve according to the set N temperature difference levels.

[0059] Wherein, N is an integer greater than 1, and the control device of the air conditioner can perform an average division or a custom division between the upper limit and the lower limit of the target temperature difference to obtain multiple temperature difference sub-intervals, and the embodiments of the present invention do not make specific limitations on this.

[0060] Specifically, in step 102, the control device of the air conditioner takes the temperature difference sub-interval where the current target temperature difference is located as the target temperature difference sub-interval, and takes the opening change value corresponding to this temperature difference sub-interval as the target opening change value.

[0061] Step 103: Control the electronic expansion valve to adjust the opening based on the target opening change value.

[0062] Specifically, in step 103, the control device of the air conditioner encapsulates the determined target opening change value into a control command and sends it to the electronic expansion valve.

[0063] The electronic expansion valve receives and responds to this control command, and can execute the target opening change value indicated in the command on the basis of the current opening, so as to realize the corresponding adjustment of the exhaust temperature according to the current opening adjustment strategy, and keep the cold and heat intersection situation in the indoor unit air duct in a relatively balanced state.

[0064] In an embodiment of the present invention, a target temperature difference is obtained between the temperature of a target area obtained in real time and the temperature of a coil pipe. By determining a target temperature difference sub-interval corresponding to the target temperature difference, an electronic expansion valve is adjusted in combination with a target opening change value corresponding to the interval. The temperature difference between the temperature near the evaporator pipe of the indoor unit and the temperature of the coil pipe is compared, and the opening of the electronic expansion valve of the room is adaptively adjusted according to the difference value, so as to maintain the cold and heat balance in the air duct during the process of the exhaust temperature changing accordingly, avoid a large amount of water droplets from condensing during air conditioner operation, and improve the comfort and safety of user use.

[0065] Based on any of the above embodiments, the temperature difference sub-intervals include: a first temperature difference sub-interval, a second temperature difference sub-interval, and a third temperature difference sub-interval.

[0066] Among them, a first opening change value corresponding to the first temperature difference sub-interval is less than 0, a second opening change value corresponding to the second temperature difference sub-interval is equal to 0, and a third opening change value corresponding to the third temperature difference sub-interval is greater than 0.

[0067] Specifically, the control device of the air conditioner uses the minimum value and the maximum value of the target temperature difference as the starting point and the ending point of the threshold interval respectively. N - 1 points are set within the threshold interval for division to obtain N heart rate sub-intervals, and a corresponding opening change value is preset for each heart rate sub-interval.

[0068] The embodiment of the present invention does not make specific limitations on the division of the temperature difference sub-intervals.

[0069] Optionally, the first temperature difference sub-interval, the second temperature difference sub-interval, and the third temperature difference sub-interval with increasing temperature difference are [0, 1), [1, 3), and [3, x) in sequence.

[0070] Among them, x is the maximum value of the target temperature difference, that is, the maximum cold and heat difference value representing condensation. Exemplarily, x is at least greater than 3°C and can be 10°C.

[0071] If the target temperature difference is in the first temperature difference sub-interval, that is, the cold and heat states in the air duct are relatively balanced, the corresponding first opening change value is set to a value less than 0 to reduce the opening of the electronic expansion valve, increase the exhaust temperature, and increase the cooling capacity in the default cooling mode.

[0072] If the target temperature difference is in the second temperature difference sub-interval, that is, the cold and heat states in the air duct are relatively balanced, the corresponding second opening change value is set to 0 to maintain the current opening of the electronic expansion valve and continue to operate in the default cooling mode.

[0073] If the target temperature difference is within the third temperature difference sub - interval, that is, the hot - cold state in the air duct is unbalanced, then the determined corresponding third opening change value is set to a value greater than 0 to increase the opening of the electronic expansion valve, reduce the exhaust temperature, reduce the cooling capacity in the default cooling mode, and avoid overheating of the evaporator.

[0074] Based on the magnitude division of the temperature difference sub - intervals, the adjustment amount of the electronic expansion valve in the embodiments of the present invention is determined as the corresponding opening change value at this magnitude, realizing the quantitative adjustment of the opening of the electronic expansion valve according to the actual target temperature difference, dynamically maintaining the hot - cold balance in the air duct, avoiding a large amount of water droplets condensed due to overheating of the air conditioner, improving the comfort and safety of user use, and also taking into account energy - efficiency savings.

[0075] On the basis of any of the above - mentioned embodiments, when the target opening change value is determined to be the first opening change value, based on the target opening change value, controlling the electronic expansion valve to adjust the opening includes: within a preset time, controlling the electronic expansion valve to reduce the opening based on the first opening change value.

[0076] Specifically, the control device of the indoor unit sends a control instruction containing the first opening change value to the electronic expansion valve every preset unit time to control the electronic expansion valve to slowly reduce the opening at a certain speed.

[0077] The embodiments of the present invention do not specifically limit the setting of the preset unit time and the first opening change value. Exemplarily, a specific implementation manner of reducing the opening is given below:

[0078] The preset unit time can be set to one minute, and the first opening change value can be set to - 10 steps. Then, after receiving the periodically sent control instruction, the electronic expansion valve slowly reduces the valve opening at a speed of reducing 10 steps per minute.

[0079] When the embodiments of the present invention execute the adjustment strategy corresponding to the first opening change value based on the decision, the electronic expansion valve is controlled to be adjusted by the first opening change value within a preset time. It can gradually increase the cooling capacity at a slow speed when the evaporator is not in an over - heated state, improve the compression efficiency in the cooling mode, and improve the energy - efficiency utilization rate.

[0080] On the basis of any of the above - mentioned embodiments, at least two sub - interval segments are included in the third temperature difference sub - interval.

[0081] Wherein, each temperature difference sub - interval segment is respectively preset with a third opening change value.

[0082] Specifically, the control device of the indoor unit performs gradient division within the third temperature difference sub - interval, successively dividing it into N1 sub - interval segments, and correspondingly setting N1 different third opening change values.

[0083] Among them, N1 is a positive integer greater than 1. The embodiments of the present invention do not specifically limit the division of the third temperature difference sub-interval.

[0084] Optionally, two sub-interval segments with increasing gradients can be divided from the third temperature difference sub-interval. When the target temperature difference is between the sub-interval segments of 3°C to 5°C, the corresponding third opening change value can be set to +40 steps. When the target temperature difference is in the sub-interval segment greater than 5°C, the corresponding third opening change value can be set to +80 steps. Furthermore, the electronic expansion valve is controlled to rapidly increase the opening to quickly reduce the refrigeration capacity and rapidly relieve the overheating of the evaporator.

[0085] Based on the gradient division of the third temperature difference sub-interval, the embodiments of the present invention enable the electronic expansion valve to increase the opening with the corresponding third opening change value, realizing the quantitative adjustment of the opening increased by the electronic expansion valve according to the actual temperature difference situation, being able to quickly and adaptively reduce the refrigeration capacity, avoid the aggravation of the overheating of the air conditioner to generate a large amount of condensate water, improve the comfort and safety of user use, and also take into account energy efficiency savings at the same time.

[0086] On the basis of any of the above embodiments, when the target area temperature is the first temperature, the target temperature difference is the absolute value of the difference between the first temperature and the coil temperature.

[0087] Among them, the first temperature is the temperature of the liquid inlet pipe of the evaporator.

[0088] It should be noted that a temperature sensor can be pre-set on the liquid inlet pipe of the evaporator, and the first temperature refers to the temperature of the liquid inlet pipe collected in real time by the temperature sensor.

[0089] Specifically, in step 101, the control device of the indoor unit receives the first temperature feedback in real time from the temperature sensor, subtracts the first temperature from the coil temperature, and uses the absolute value of the difference as the target temperature difference to determine whether the indoor evaporator is overheated.

[0090] When the target temperature difference is in the first temperature difference sub-interval, the opening of the electronic expansion valve is reduced to increase the exhaust temperature.

[0091] When the target temperature difference is in the second temperature difference sub-interval, the opening of the electronic expansion valve remains unchanged.

[0092] When the target temperature difference is in the third temperature difference sub-interval, the opening of the electronic expansion valve is increased to reduce the exhaust temperature.

[0093] Based on monitoring the temperature difference between the liquid inlet pipe temperature and the coil temperature during refrigeration to determine whether it is overheated, the embodiments of the present invention can make adaptive adjustments to the electronic expansion valve and the exhaust temperature through the temperature difference to prevent the generation of the phenomenon of cold and heat intersection in the indoor unit to generate a large amount of condensate water, and improve the comfort and safety of user use.

[0094] Based on any of the above embodiments, when the temperature of the target area is the second temperature, the target temperature difference is the absolute value of the difference between the second temperature and the coil temperature.

[0095] Wherein, the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0096] It should be noted that a temperature sensor can be pre - set on the liquid outlet pipe of the evaporator, and the second temperature refers to the temperature of the liquid outlet pipe collected in real - time by this temperature sensor.

[0097] Specifically, in step 101, the control device of the indoor unit receives the second temperature fed back in real - time by this temperature sensor, subtracts the coil temperature from the second temperature, and uses the absolute value of the difference as the target temperature difference to determine whether the indoor evaporator is overheated.

[0098] When the target temperature difference is in the first temperature - difference sub - interval, the opening degree of the electronic expansion valve is reduced to increase the exhaust temperature.

[0099] When the target temperature difference is in the second temperature - difference sub - interval, the opening degree of the electronic expansion valve remains unchanged.

[0100] When the target temperature difference is in the third temperature - difference sub - interval, the opening degree of the electronic expansion valve is increased to reduce the exhaust temperature.

[0101] The embodiment of the present invention determines whether it is overheated based on monitoring the temperature difference between the liquid outlet pipe temperature and the coil temperature during refrigeration, and can make adaptive adjustments to the electronic expansion valve and the exhaust temperature through the temperature difference to prevent the phenomenon of cold - heat intersection in the indoor unit from generating a large amount of condensed water, improving the comfort and safety of user use.

[0102] Based on any of the above embodiments, when the temperature of the target area is the first temperature and the second temperature, based on the temperature of the target area and the coil temperature, the target temperature difference is obtained, including: determining the first temperature difference and the second temperature difference based on the absolute values of the differences between the coil temperature and the first temperature and the second temperature respectively.

[0103] Wherein, the first temperature is the temperature of the liquid inlet pipe of the evaporator, and the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0104] It should be noted that temperature sensors can be pre - set on both the liquid inlet pipe and the liquid outlet pipe of the evaporator, and the first temperature and the second temperature are respectively the temperatures of the liquid inlet pipe and the liquid outlet pipe collected in real - time by each sensor.

[0105] Specifically, in step 101, the control device of the indoor unit receives the first temperature and the second temperature that are real-time feedback by each temperature sensor, takes the absolute value of the difference between the first temperature and the coil temperature as the first temperature difference, and takes the absolute value of the difference between the second temperature and the coil temperature as the second temperature difference, so as to determine whether the indoor evaporator is overheated.

[0106] Based on the first temperature difference and the second temperature difference, determine the target temperature difference.

[0107] Specifically, the control device of the indoor unit uses the first temperature difference and the second temperature difference for weighted average to obtain the target temperature difference. The embodiments of the present invention do not make specific limitations on its weight distribution.

[0108] Optionally, the weights of the first temperature difference and the second temperature difference can both be set to 1, that is, both the first temperature difference and the second temperature difference are used as the target temperature difference. Then, it is required that both the first temperature difference and the second temperature difference fall into the same target temperature difference sub-interval to determine the target opening change value corresponding to this interval.

[0109] Optionally, the weights of the first temperature difference and the second temperature difference can be set to 0 and 1 respectively, that is, either the first temperature difference or the second temperature difference is used as the target temperature difference. This indicates that as long as any one of the first temperature difference and the second temperature difference falls into the target temperature difference sub-interval, the target opening change value corresponding to this interval can be determined.

[0110] Optionally, the weights of the first temperature difference and the second temperature difference can both be set to 0.5, that is, the target temperature difference includes the first temperature difference and the second temperature difference. Then, it is necessary to first perform a weighted average on the first temperature difference and the second temperature difference, and use the calculated value as the target temperature difference. When the target temperature difference falls into the target temperature difference sub-interval, the target opening change value corresponding to this interval can be determined.

[0111] The embodiments of the present invention determine whether it is overheated based on monitoring the temperature difference between the inlet and outlet liquid pipes and the coil temperature during refrigeration, and can make an adaptive adjustment to the electronic expansion valve and the exhaust temperature through the temperature difference, so as to prevent the phenomenon of cold and heat intersection in the indoor unit from generating a large amount of condensate water, and improve the comfort and safety of user use.

[0112] Figure 2 It is a schematic structural diagram of the control device of the indoor unit provided by the present invention. On the basis of any of the above embodiments, as Figure 2 shown, the auxiliary sleep control device of the air conditioner provided by the embodiments of the present invention includes: a temperature difference acquisition module 210, an opening degree determination module 220, and a control module 230, where:

[0113] The temperature difference acquisition module 210 is configured to, when it is determined that the refrigeration mode is started, obtain a target temperature difference based on the target area temperature and the coil temperature.

[0114] An opening degree determination module 220 is configured to determine a target opening degree change value of the electronic expansion valve according to a target temperature difference sub-interval corresponding to the target temperature difference.

[0115] A control module 230 is configured to control the electronic expansion valve to adjust the opening degree based on the target opening degree change value.

[0116] Wherein, the target temperature difference sub-interval is one of all the temperature difference sub-intervals; each temperature difference sub-interval is preset with an opening degree change value; the target area temperature includes the temperature of the liquid inlet pipe and / or the liquid outlet pipe of the evaporator.

[0117] Specifically, the temperature difference acquisition module 210, the opening degree determination module 220 and the control module 230 are electrically connected in sequence.

[0118] When the temperature difference acquisition module 210 receives and responds to the operating state information fed back by the air conditioner and determines that the current operating mode is the refrigeration mode, it calculates the temperature difference by using the target area temperature collected by the sensing module during the current working cycle and combining the coil temperature fed back by the coil temperature sensor, and obtains the target temperature difference.

[0119] The opening degree determination module 220 takes the temperature difference sub-interval where the current target temperature difference is located as the target temperature difference sub-interval, and takes the opening degree change value corresponding to this temperature difference sub-interval as the target opening degree change value.

[0120] The control module 230 encapsulates the determined target opening degree change value into a control instruction and sends it to the electronic expansion valve.

[0121] The electronic expansion valve receives and responds to this control instruction, and can, based on the current opening degree, execute the target opening degree change value indicated in the instruction, so as to adjust the exhaust temperature according to the current opening degree adjustment strategy, and keep the cold and heat intersection situation in the indoor unit air duct in a relatively balanced state.

[0122] Optionally, the temperature difference sub-intervals include: a first temperature difference sub-interval, a second temperature difference sub-interval and a third temperature difference sub-interval.

[0123] Wherein, the first opening degree change value corresponding to the first temperature difference sub-interval is less than 0, the second opening degree change value corresponding to the second temperature difference sub-interval is equal to 0, and the third opening degree change value corresponding to the third temperature difference sub-interval is greater than 0.

[0124] Optionally, when it is determined that the target opening degree change value is the first opening degree change value, the control module 230 includes a control unit, wherein:

[0125] The control unit is configured to control the electronic expansion valve to reduce the opening degree based on the first opening degree change value within a preset time.

[0126] Optionally, the third temperature difference sub-interval includes at least two sub-interval segments.

[0127] Wherein, each temperature difference sub-interval segment is preset with a third opening change value.

[0128] Optionally, when the temperature of the target area is the first temperature, the target temperature difference is the absolute value of the difference between the first temperature and the coil temperature.

[0129] Wherein, the first temperature is the temperature of the liquid inlet pipe of the evaporator.

[0130] Optionally, when the temperature of the target area is the second temperature, the target temperature difference is the absolute value of the difference between the second temperature and the coil temperature;

[0131] Wherein, the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0132] Optionally, when the temperature of the target area is the first temperature and the second temperature, the temperature difference acquisition module 210 includes a first determination unit and a second determination unit, wherein:

[0133] The first determination unit is configured to determine a first temperature difference and a second temperature difference based on the absolute values of the differences between the coil temperature and the first temperature and the second temperature respectively.

[0134] The second determination unit is configured to determine the target temperature difference based on the first temperature difference and the second temperature difference.

[0135] Wherein, the first temperature is the temperature of the liquid inlet pipe of the evaporator, and the second temperature is the temperature of the liquid outlet pipe of the evaporator.

[0136] The control device of the indoor unit provided by the embodiment of the present invention is used to execute the control method of the indoor unit of the present invention above. Its implementation manner is consistent with the implementation manner of the control method of the indoor unit provided by the present invention, and the same beneficial effects can be achieved, which will not be elaborated here.

[0137] Based on the target area temperature obtained in real time and the coil temperature, the embodiment of the present invention obtains the target temperature difference, and determines the target temperature difference sub-interval corresponding to the target temperature difference, so that the electronic expansion valve is adjusted in combination with the target opening change value corresponding to the interval. It realizes the comparison of the temperature difference between the temperature near the evaporation pipe of the indoor unit and the coil temperature, and adaptively adjusts the opening of the indoor electronic expansion valve according to the difference value, thereby maintaining the cold and heat balance in the air duct during the process of the exhaust temperature changing accordingly, avoiding a large amount of water droplets from condensing during air conditioner operation, and improving the comfort and safety of user use.

[0138] Figure 3 It is a schematic structural diagram of the air conditioner provided by the present invention. On the basis of any of the above embodiments, as Figure 3As shown in the figure, the air conditioner includes an indoor unit 310 and an outdoor unit 320. A control processor 311 and a sensing module 312 are provided in the indoor unit 310, and the sensing module 312 is arranged on the evaporator of the indoor unit 310. It also includes a memory and a program or instruction stored on the memory and executable on the control processor. When the program or instruction is executed by the control processor 311, the control method of the indoor unit is executed.

[0139] Among them, the sensing module 312 includes a first sensor and / or a second sensor. The first sensor is arranged on the liquid inlet pipe of the evaporator, and the second sensor is arranged on the liquid outlet pipe of the evaporator.

[0140] Specifically, the air conditioner is composed of the body of the indoor unit 310 and the body of the outdoor unit 320. Among them, the control processor 311 can be integrated into the control development board of the indoor unit 310 in the form of a chip or a microprocessor. Through the communication connection between the control processor 311 and the indoor unit 310 and the sensing module 312 respectively, the control of the indoor unit in the cooling mode is realized.

[0141] It is also necessary to set the sensing module 312 at the evaporation pipe in the indoor unit 310 to collect the temperature in the installation area in real time and feedback it to the control processor 311 for logical judgment of the opening degree control of the electronic expansion valve in the indoor unit 310. The control processor 311 and the indoor unit 310 and the sensing module 312 respectively use wireless communication technology for signal transmission. The embodiments of the present invention do not make specific limitations on the number of temperature sensors in the sensing module.

[0142] Optionally, the number of temperature sensors in the sensing module can be one, that is, a first sensor can be set at the liquid inlet pipe of the evaporator, or a second sensor can be set at the liquid outlet pipe of the evaporator.

[0143] Optionally, the number of temperature sensors in the sensing module can be at least two, then at least one first sensor can be set at the liquid inlet pipe of the evaporator, and at least one second sensor can also be set at the liquid outlet pipe of the evaporator.

[0144] Among them, the wireless communication technology includes but is not limited to WIFI wireless cellular signals (2G, 3G, 4G, 5G), Bluetooth, Zigbee, etc. The embodiments of the present invention do not make specific limitations on this.

[0145] The air conditioner of the present invention further includes a memory and a program or instruction stored on the memory and operable on the control processor 311. The above control processor 311 can call the logical instructions in the memory to execute the control method of the indoor unit of the present invention. The method includes: when it is determined that the cooling mode is started, obtaining a target temperature difference based on the target area temperature and the coil temperature; determining a target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference; controlling the electronic expansion valve to adjust the opening based on the target opening change value; wherein, the target temperature difference sub-interval is one of all the temperature difference sub-intervals; each temperature difference sub-interval is preset with an opening change value; the target area temperature includes the liquid inlet pipe temperature and / or the liquid outlet pipe temperature of the evaporator.

[0146] Based on the target area temperature obtained in real time and the coil temperature, the embodiment of the present invention obtains a target temperature difference, and determines a target temperature difference sub-interval corresponding to the target temperature difference, so that the electronic expansion valve is adjusted in combination with the target opening change value corresponding to the interval. It realizes the comparison of the temperature difference between the temperature near the evaporation pipe of the indoor unit and the coil temperature, adaptively adjusts the opening of the indoor electronic expansion valve according to the difference value, and then maintains the cold and heat balance in the air duct during the process of the exhaust temperature changing accordingly, avoids a large amount of water droplets from condensing when the air conditioner operates, and improves the comfort and safety of user use.

[0147] On the other hand, the present invention also provides a computer program product, the computer program product includes a computer program, the computer program can be stored on a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the control method of the indoor unit provided by the above-mentioned various methods. The method includes: when it is determined that the cooling mode is started, obtaining a target temperature difference based on the target area temperature and the coil temperature; determining a target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference; controlling the electronic expansion valve to adjust the opening based on the target opening change value; wherein, the target temperature difference sub-interval is one of all the temperature difference sub-intervals; each temperature difference sub-interval is preset with an opening change value; the target area temperature includes the liquid inlet pipe temperature and / or the liquid outlet pipe temperature of the evaporator.

[0148] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements a control method for an indoor unit provided by the above-mentioned various methods. The method includes: when it is determined that the cooling mode is started, based on the target area temperature and the coil temperature, obtaining a target temperature difference; determining a target opening change value of an electronic expansion valve according to a target temperature difference sub-interval corresponding to the target temperature difference; controlling the electronic expansion valve to adjust the opening based on the target opening change value; wherein, the target temperature difference sub-interval is one of all temperature difference sub-intervals; each temperature difference sub-interval is respectively preset with an opening change value; the target area temperature includes the inlet pipe temperature and / or the outlet pipe temperature of the evaporator.

[0149] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0150] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solutions, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0151] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for 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 of the embodiments of the present invention.

Claims

1. A control method for an indoor unit, characterized in that, including: When it is determined that the refrigeration mode is started, based on the target area temperature and the coil temperature, obtain the target temperature difference; Determine the target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference; Based on the target opening change value, control the electronic expansion valve to adjust the opening; Wherein, the target temperature difference sub-interval is one of all temperature difference sub-intervals; each of the temperature difference sub-intervals is preset with an opening change value; the target area temperature includes the inlet pipe temperature and the outlet pipe temperature of the evaporator; the temperature difference sub-interval is obtained by dividing the threshold interval with the minimum value and the maximum value of the target temperature difference as the starting point and the ending point of the threshold interval respectively, and the maximum value corresponds to the maximum cold and heat difference value when condensation occurs; Wherein, the obtaining the target temperature difference based on the target area temperature and the coil temperature includes: Obtain the target temperature difference by calculating the weighted average of the first temperature difference between the inlet pipe temperature and the coil temperature and the second temperature difference between the outlet pipe temperature and the coil temperature.

2. The control method of the indoor unit according to claim 1, characterized in that The temperature difference sub-interval includes: a first temperature difference sub-interval, a second temperature difference sub-interval and a third temperature difference sub-interval; Wherein, the first opening change value corresponding to the first temperature difference sub-interval is less than 0, the second opening change value corresponding to the second temperature difference sub-interval is equal to 0, and the third opening change value corresponding to the third temperature difference sub-interval is greater than 0.

3. The control method of the indoor unit according to claim 2, characterized in that, When it is determined that the target opening change value is the first opening change value, the controlling the electronic expansion valve to adjust the opening based on the target opening change value includes: Within a preset time, based on the first opening change value, control the electronic expansion valve to reduce the opening.

4. The control method of the indoor unit according to claim 2, characterized in that, At least two sub-interval segments are included in the third temperature difference sub-interval; Wherein, each of the temperature difference sub-interval segments is preset with a third opening change value.

5. A control device for an indoor unit, characterized in that, including: A temperature difference acquisition module, configured to obtain a target temperature difference based on the target area temperature and the coil temperature when it is determined that the refrigeration mode is started; An opening determination module, configured to determine the target opening change value of the electronic expansion valve according to the target temperature difference sub-interval corresponding to the target temperature difference; A control module, configured to control the electronic expansion valve to adjust the opening based on the target opening change value; Wherein, the target temperature difference sub-interval is one of all temperature difference sub-intervals; each of the temperature difference sub-intervals is preset with an opening change value; the target area temperature includes the inlet pipe temperature and the outlet pipe temperature of the evaporator; the temperature difference sub-interval is obtained by dividing the threshold interval with the minimum value and the maximum value of the target temperature difference as the starting point and the ending point of the threshold interval respectively, and the maximum value corresponds to the maximum cold and heat difference value when condensation occurs; Wherein, the obtaining the target temperature difference based on the target area temperature and the coil temperature includes: Obtain the target temperature difference by calculating the weighted average of the first temperature difference between the inlet pipe temperature and the coil temperature and the second temperature difference between the outlet pipe temperature and the coil temperature.

6. An air conditioner, characterized in that, It includes an indoor unit and an outdoor unit. A control processor and a sensing module are provided in the indoor unit, and the sensing module is arranged on the evaporator of the indoor unit. It further includes a memory and a program or instruction stored on the memory and executable on the control processor. When the program or instruction is executed by the control processor, it executes the control method of the indoor unit according to any one of claims 1 to 4. Among them, the sensing module includes a first sensor and / or a second sensor. The first sensor is arranged on the liquid inlet pipe of the evaporator, and the second sensor is arranged on the liquid outlet pipe of the evaporator.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the control method of the indoor unit according to any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the control method of the indoor unit according to any one of claims 1 to 4.

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