Control Method, Device and Air Conditioner of Outdoor Unit

Abstract

The present invention provides a control method, device and air conditioner for an outdoor unit. The method includes: obtaining subcooling degree data based on a first temperature and a second temperature of a condenser; if it is determined that the subcooling degree data is in a first interval, controlling the outdoor unit to increase the fan speed; if it is determined that the subcooling degree data is in a second interval, controlling the outdoor unit to decrease the fan speed. The control method, device and air conditioner for the outdoor unit provided by the present invention determine the subcooling degree data based on the first temperature and the second temperature of the condenser, and decide to control the indoor unit to increase or decrease the fan speed through the subcooling degree data, realizing the analysis of the load state of the condenser according to the internal and external temperatures of the condenser, and adaptively adjusting the fan speed of the outdoor unit, so that the condenser under the refrigeration mode always maintains a normal subcooling degree range, ensuring the corresponding refrigerating capacity and saving energy efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to a control method, device and air conditioner for an outdoor unit. Background Art

[0002] In existing air conditioning products, generally an outdoor unit and an indoor unit are included. A fan and a heat exchanger are respectively installed on the outdoor unit and the indoor unit to perform heat exchange with the outdoor environment and the indoor environment respectively. Therefore, in order to achieve a better heat exchange effect, the change in the rotational speed of the fan can be directly related to the heating or cooling performance of the air conditioner.

[0003] During the operation of the air conditioner in the cooling mode, the rotational speed of the fan of the outdoor unit is determined by the frequency and the ambient temperature outside the unit. In many cases, the rotational speed of the fan of the outdoor unit is relatively large or small with respect to the outdoor unit system. If the rotational speed of the fan is too small, the heat exchange amount of the condenser is insufficient, resulting in poor cooling effect. If the rotational speed of the fan is too large, the condensate in the condenser is serious, the fluidity of the refrigerant becomes poor, and after throttling, the refrigerant cannot reach the indoor unit or only a small amount of refrigerant reaches the indoor unit, resulting in a lack of refrigerant in the indoor unit and a low evaporation pressure, resulting in a high cooling energy efficiency. Therefore, at present, the air conditioner in the cooling mode cannot simultaneously achieve a good cooling effect and a low cooling energy efficiency. Summary of the Invention

[0004] The present invention provides a control method, device and air conditioner for an outdoor unit to solve the defect in the prior art that in the cooling mode, a good cooling effect and a low cooling energy efficiency cannot be achieved simultaneously.

[0005] The present invention provides a control method for an outdoor unit, including:

[0006] Obtaining subcooling degree data based on a first temperature and a second temperature of the condenser;

[0007] If it is determined that the subcooling degree data is in a first interval, controlling the outdoor unit to increase the rotational speed of the fan;

[0008] If it is determined that the subcooling degree data is in a second interval, controlling the outdoor unit to decrease the rotational speed of the fan;

[0009] Wherein, the first temperature is the internal temperature of the condenser in the cooling mode, and the second temperature is the outlet temperature of the condenser in the cooling mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0010] According to the control method for an outdoor unit provided by the present invention, the step of if it is determined that the subcooling degree data is in the first interval, controlling the outdoor unit to increase the rotational speed of the fan specifically includes:

[0011] Obtaining a first compensation coefficient corresponding to the first target sub-interval according to the first target sub-interval corresponding to the subcooling degree data;

[0012] Determine a target fan speed based on the current fan speed of the outdoor unit, the subcooling degree data, and the first compensation coefficient;

[0013] Adjust the fan speed of the outdoor unit based on the target fan speed;

[0014] Wherein, the first target sub-interval is obtained by dividing the first interval; the first compensation coefficient is greater than zero.

[0015] According to a control method for an outdoor unit provided by the present invention, the adjusting the fan speed of the outdoor unit based on the target fan speed includes:

[0016] When it is determined that the target fan speed is greater than or equal to the maximum rated speed of the outdoor unit, control the outdoor unit to adjust the fan speed to the maximum speed;

[0017] Continue to re-acquire new subcooling degree data based on the first temperature and the second temperature of the condenser;

[0018] When the new subcooling degree data matches the first interval, control the electronic expansion valve of the outdoor unit to adjust the opening degree.

[0019] According to a control method for an outdoor unit provided by the present invention, when the new subcooling degree data matches the first interval, controlling the electronic expansion valve of the outdoor unit to adjust the opening degree specifically includes:

[0020] Obtain an opening degree change value corresponding to the first target sub-interval according to the new first target sub-interval corresponding to the new subcooling degree data;

[0021] Based on the opening degree change value, control the electronic expansion valve to increase the opening degree;

[0022] Wherein, the new first target sub-interval is obtained by dividing the first interval.

[0023] According to a control method for an outdoor unit provided by the present invention, controlling the electronic expansion valve to increase the opening degree based on the opening degree change value includes:

[0024] Within a first preset time period, control the electronic expansion valve to increase the opening degree according to the opening degree change value, so that the electronic expansion valve maintains the increased opening degree value for a second preset time period;

[0025] Wherein, the first preset time period is greater than the second preset time period.

[0026] A control method for an outdoor unit provided by the present invention. If it is determined that the subcooling degree data is in the second interval, controlling the outdoor unit to reduce the fan speed specifically includes:

[0027] According to the second target sub-interval corresponding to the subcooling degree data, to obtain the second compensation coefficient corresponding to the second target sub-interval;

[0028] Based on the current fan speed of the outdoor unit, the subcooling degree data, and the second compensation coefficient, determine the target fan speed;

[0029] Based on the target fan speed, adjust the fan speed of the outdoor unit;

[0030] Wherein, the second target sub-interval is obtained by dividing the second interval; the second compensation coefficient is greater than zero.

[0031] The present invention also provides a control device for an outdoor unit, including:

[0032] A subcooling degree acquisition module, configured to acquire subcooling degree data based on the first temperature and the second temperature of the condenser;

[0033] A first control module, configured to control the outdoor unit to increase the fan speed if it is determined that the subcooling degree data is in the first interval;

[0034] A second control module, configured to control the outdoor unit to reduce the fan speed if it is determined that the subcooling degree data is in the second interval;

[0035] Wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the outlet temperature of the condenser in the refrigeration mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0036] The present invention also provides an air conditioner, including an indoor unit and an outdoor unit. A control processor and a sensing module are provided in the outdoor unit, and the sensing module is arranged at the condensate pipe of the outdoor 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 for the outdoor unit as described in any one of the above;

[0037] Wherein, the sensing module includes a first module and a second module. The first module is arranged in the middle of the condensate pipe, and the second module is arranged at the outlet of the condensate pipe.

[0038] 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 for the outdoor unit as described in any one of the above.

[0039] The present invention also provides a computer program product, including a computer program which, when executed by a processor, implements the control method of the outdoor unit as described in any one of the above.

[0040] The control method, device and air conditioner of the outdoor unit provided by the present invention determine the subcooling degree data based on the first temperature and the second temperature of the condenser, and decide to control the indoor unit to increase or decrease the fan speed through the subcooling degree data, realizing the analysis of the load state of the condenser according to the internal and external temperatures of the condenser, and adaptively adjusting the fan speed of the outdoor unit, so that the condenser under the refrigeration mode always maintains a normal subcooling degree range, ensuring the corresponding refrigerating capacity and saving energy efficiency. Description of the Drawings

[0041] 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 based on these drawings without creative efforts.

[0042] Figure 1 is a schematic flowchart of the control method of the outdoor unit provided by the present invention;

[0043] Figure 2 is a schematic structural diagram of the control device of the outdoor unit provided by the present invention;

[0044] Figure 3 is a schematic structural diagram of the air conditioner provided by the present invention. Detailed Embodiments

[0045] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0046] The terms "first", "second", etc. in this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order different from those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or multiple.

[0047] 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.

[0048] 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.

[0049] Figure 1 It is a schematic flowchart of the control method of the outdoor unit provided by the present invention. As Figure 1 shown, the control method of the outdoor unit provided by the embodiment of the present invention includes: Step 101, obtaining subcooling degree data based on the first temperature and the second temperature of the condenser.

[0050] Wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the air outlet temperature of the condenser in the refrigeration mode.

[0051] It should be noted that the execution subject of the control method of the outdoor unit provided by the embodiment of the present invention is the control device of the outdoor unit.

[0052] The application scenario of the control method of the outdoor unit provided by the embodiment of the present invention is that after the user activates the refrigeration mode of the air conditioning system, the temperature inside and outside the condenser is obtained in real time through the sensing module, and the subcooling degree is calculated by subtracting the two, and the fan of the outdoor unit is controlled by the subcooling degree to make the subcooling degree in a good range.

[0053] Wherein, the first temperature refers to the condensation temperature during the operation of the condenser, that is, the temperature in the middle section of the condenser.

[0054] The second temperature refers to the condensation temperature after the operation of the condenser, that is, the temperature at the air outlet of the condenser.

[0055] The sensing module arranged on the condenser periodically collects the first temperature and the second temperature of the condenser at a specified time interval and sends the two to the control device of the outdoor unit. The embodiment of the present invention does not specifically limit the working cycle of the sensing module.

[0056] Optionally, the sensing module can perform the acquisition operation with the default working cycle.

[0057] Optionally, the user can issue a cycle change instruction, so that the sensing module receives and responds to the instruction, and changes the working cycle to the cycle indicated by the instruction for the acquisition operation.

[0058] It should be noted that before step 101, the user needs to send an activation instruction through a transmission medium to activate the cooling mode of the air conditioning system, so that the indoor unit in the air conditioning system operates at the default wind speed of this mode, while the outdoor unit operates at the default frequency of this mode.

[0059] Optionally, the user can use the wireless communication method between the control device and the air conditioning system through the control device to transmit the activation instruction, so that the air conditioning system initializes the cooling mode.

[0060] Optionally, the user can send an activation instruction through voice interaction. After the air conditioning system receives the activation instruction and performs voice recognition, it initializes the cooling mode.

[0061] Specifically, in step 101, after the control device of the outdoor unit determines that the air conditioner starts the cooling mode according to the operation information fed back by each component based on the activation instruction, it receives the first temperature and the second temperature collected by the sensing module during the current working cycle, and uses the first temperature and the second temperature to calculate the difference to calculate the subcooling degree data.

[0062] Step 102-1: If it is determined that the subcooling degree data is in the first interval, control the outdoor unit to increase the fan speed.

[0063] Wherein, the first interval is determined by the normal subcooling degree range of the condenser.

[0064] It should be noted that different condensers use different refrigerants, so their corresponding normal subcooling degree ranges are also different.

[0065] The first interval refers to the interval formed by being less than the lower limit of the normal subcooling degree range of a certain condenser.

[0066] Exemplarily, if the refrigerant carried by the condenser can be R23 and its corresponding normal subcooling degree range is between 6°C and 8°C, then the first interval can be [-∞, 6).

[0067] Specifically, in step 102-1, the control device of the outdoor unit compares the subcooling degree data obtained in step 101 with the normal subcooling degree range of the condenser. If it is determined that its value is in the first interval, it sends a speed increase control instruction to the outdoor unit.

[0068] The outdoor unit receives and responds to the speed increase control instruction, increases the speed of the internal fan, promotes the heat exchange process of the condenser by increasing the wind force, quickly reduces the second temperature, so that the subcooling degree data formed by the difference between the first temperature and the second temperature increases, and makes the increased subcooling degree data within the corresponding normal subcooling degree range to enhance the cooling effect.

[0069] Step 102-2: If it is determined that the subcooling degree data is in the second interval, control the outdoor unit to reduce the fan speed.

[0070] Wherein, the second interval is determined by the normal subcooling degree range of the condenser.

[0071] It should be noted that the second interval refers to the interval formed by being greater than the upper limit of the normal subcooling degree range of a certain condenser.

[0072] Exemplarily, if the refrigerant carried by the condenser can be R23 and its corresponding normal subcooling degree range is between 6°C and 8°C, then the second interval can be (8, +∞].

[0073] Specifically, in Step 102-2, the control device of the outdoor unit compares the subcooling degree data obtained in Step 101 with the normal subcooling degree range of the condenser. If it is determined that the value is in the second interval, a speed reduction control instruction is sent to the outdoor unit.

[0074] The outdoor unit receives and responds to the speed reduction control instruction, reduces the speed of the internal fan, slows down the heat exchange process of the condenser by reducing the wind force, relatively increases the second temperature, so that the subcooling degree data formed by the difference between the first temperature and the second temperature is reduced, and the reduced subcooling degree data is within the corresponding normal subcooling degree range, strengthening the fluidity of the refrigerant and saving the refrigeration energy efficiency.

[0075] It can be understood that if the subcooling degree data is within the normal subcooling degree range corresponding to the condenser, there is no need to control the outdoor unit to adjust the fan speed.

[0076] In the embodiment of the present invention, the subcooling degree data is determined based on the first temperature and the second temperature of the condenser. By making a decision on the subcooling degree data to control the indoor unit to increase the fan speed or reduce the fan speed, the load state of the condenser is analyzed according to the internal and external temperatures of the condenser, and the fan speed of the outdoor unit is adaptively adjusted, so that the condenser under the refrigeration mode always maintains the normal subcooling degree range, ensuring the corresponding refrigeration capacity and saving energy efficiency.

[0077] Based on any of the above embodiments, if it is determined that the subcooling degree data is in the first interval, controlling the outdoor unit to increase the fan speed specifically includes: obtaining the first compensation coefficient corresponding to the first target sub-interval according to the first target sub-interval corresponding to the subcooling degree data.

[0078] Wherein, the first target sub-interval is obtained by dividing the first interval. The first compensation coefficient is greater than zero.

[0079] It should be noted that the control device of the outdoor unit pre-sets N1 points in the first interval for division to obtain N1 + 1 sub-intervals.

[0080] Wherein, N1 is a positive integer greater than or equal to 1. Different first compensation coefficients are respectively set for each sub-interval. Moreover, each first compensation coefficient is greater than zero, and its value decreases as the proximity of the upper limit value of the corresponding sub-interval to the upper limit value of the first interval increases.

[0081] Specifically, in step 102-1, the control device of the outdoor unit uses the sub-interval where the supercooling degree data is located as the first target sub-interval, and obtains the first compensation coefficient corresponding to this sub-interval.

[0082] Based on the current fan speed of the outdoor unit, the supercooling degree data, and the first compensation coefficient, determine the target fan speed.

[0083] Specifically, the control device of the outdoor unit substitutes the obtained current fan speed, supercooling degree data, and first compensation coefficient into the corresponding mathematical model to calculate the target fan speed.

[0084] The mathematical model of the target fan speed in the embodiment of the present invention is not specifically limited. Exemplarily, the calculation formula of the target fan speed is as follows:

[0085] V targe = V + (a1 - Δt) * k1

[0086] Wherein, V targe is the target fan speed, V is the current fan speed, and Δt is the supercooling degree data.

[0087] a1 is the temperature coefficient corresponding to the first target sub-interval, and its value is determined by the normal supercooling degree range of the condenser. Exemplarily, a1 = 8.

[0088] k1 is the first compensation coefficient, and its value is determined by the sub-intervals pre-divided for the first interval. Taking N1 equal to 1 as an example, the first interval can be divided into two sub-intervals, namely [-∞, 4) and [4, 6), where:

[0089] If Δt ∈ [-∞, 4), then k1 = 50, that is, the calculation formula of the target fan speed is as follows:

[0090] V targe = V + (8 - Δt) * 50

[0091] If Δt ∈ [4, 6), then k1 = 30, that is, the calculation formula of the target fan speed is as follows:

[0092] V targe = V + (8 - Δt) * 30

[0093] Based on the target fan speed, adjust the fan speed of the outdoor unit.

[0094] Specifically, the control device of the outdoor unit encapsulates the calculated target fan speed into the speed increase control command and sends it to the outdoor unit.

[0095] The outdoor unit receives and responds to the speed increase control command, and increases the current fan speed to the target fan speed. Moreover, the target fan speed shall not exceed the maximum rated speed of the fan in the outdoor unit.

[0096] It can be understood that during the process of increasing the speed of the fan in the outdoor unit, the speed pauses for 30 seconds every time it increases by one minute, and the subcooling data is judged again to prevent the wind speed from jumping back and forth.

[0097] When the embodiment of the present invention determines to control the indoor unit to increase the fan speed based on the subcooling data, the first compensation coefficient is determined through the subinterval where the subcooling data is located, and the target fan speed is calculated by combining the current fan speed and the subcooling data, so that the outdoor unit can increase the fan speed to the target fan speed. It realizes the analysis of the load state of the condenser according to the internal and external temperatures of the condenser, and makes corresponding quantitative adjustment of the fan speed according to the subcooling data, so as to increase the subcooling degree of the condenser under the refrigeration mode to the normal subcooling degree range and ensure the corresponding refrigerating capacity.

[0098] Based on any of the above embodiments, adjusting the fan speed of the outdoor unit based on the target fan speed includes: when it is determined that the target fan speed is greater than or equal to the maximum rated speed of the outdoor unit, controlling the outdoor unit to adjust the fan speed to the maximum speed.

[0099] Specifically, the control device of the outdoor unit compares the target fan speed with the maximum rated speed of the outdoor unit:

[0100] If the target fan speed is greater than or equal to the rated maximum speed, the rated maximum speed is used as the target fan speed to control the outdoor unit to increase the fan speed to the rated maximum value, and continue to monitor the internal and external temperatures of the condenser during the operation at this speed.

[0101] If the target fan speed is less than the rated maximum speed, the outdoor unit is directly controlled to increase the fan speed to the target fan speed, and continue to monitor the internal and external temperatures of the condenser during the operation at this speed.

[0102] Continue to obtain new subcooling data based on the first temperature and the second temperature of the condenser.

[0103] Specifically, during the process of the fan of the outdoor unit continuously operating at the rated maximum speed value, the control device of the outdoor unit performs a subtraction operation based on the first temperature and the second temperature continuously fed back by the sensing module to obtain a new subcooling data.

[0104] When the new supercooling degree data matches the first interval, the electronic expansion valve of the outdoor unit is controlled to adjust the opening degree.

[0105] Specifically, the control device of the outdoor unit continues to compare the new subcooling data with the normal subcooling range of the condenser, and if it is determined that the value is still in the first interval, a control instruction is sent to the electronic expansion valve of the outdoor unit.

[0106] The electronic expansion valve receives and responds to control instructions. When the fan speed of the outdoor unit has been compensated to the maximum and the subcooling degree has not yet reached the normal subcooling range, the electronic expansion valve needs to increase its opening appropriately to provide additional compensation to ensure that the compensated subcooling data is within the corresponding normal subcooling range and enhance the refrigeration effect.

[0107] In the embodiment of the present invention, when the target fan speed has reached the rated maximum speed and the new subcooling data has not reached the normal range, the electronic expansion valve is controlled to increase the opening to add corresponding compensation. The load state of the condenser is analyzed according to the internal and external temperatures. When the subcooling of the condenser is not improved after the maximum compensation by increasing the fan speed, the electronic expansion valve is compensated and adjusted according to the new subcooling data, so that the exhaust temperature is reduced by increasing the opening of the electronic expansion valve during the operation of the fan at the maximum speed, thereby ensuring the corresponding cooling capacity.

[0108] On the basis of any of the above embodiments, when the new supercooling data matches the first interval, controlling the electronic expansion valve of the outdoor unit to adjust the opening, specifically includes: according to the new first target subinterval corresponding to the new supercooling data, to obtain the opening change value corresponding to the first target subinterval.

[0109] The new first target sub-interval is obtained by dividing the first interval.

[0110] It should be noted that, for the N1+1 sub-intervals pre-divided from the first interval, each sub-interval sets a different opening strategy around the opening change value. Moreover, the opening change value is always greater than zero.

[0111] Specifically, in step 102-1, the control device of the outdoor unit takes the sub-interval where the new supercooling degree data is located as a new first target sub-interval, and obtains the opening degree change value corresponding to the sub-interval.

[0112] Based on the opening degree change value, the electronic expansion valve is controlled to increase its opening degree.

[0113] Specifically, the control device of the outdoor unit encapsulates the determined opening change value speed into a control instruction, and sends it to the electronic expansion valve.

[0114] The electronic expansion valve receives and responds to a control instruction. Based on the current opening degree, it can execute the opening degree change value indicated in the instruction, adjust the exhaust temperature according to the current opening degree adjustment strategy, and maintain the subcooling degree of the condenser within a normal range.

[0115] The embodiments of the present invention do not specifically limit different opening degree adjustment strategies.

[0116] Exemplarily, for the sub-interval [-∞, 4) of the first interval, the corresponding opening degree change value can be set to +10 steps. After the electronic expansion valve receives the control instruction, it increases by 10 steps per minute, gradually increasing the valve opening degree by a large margin.

[0117] For the sub-interval [4, 6) of the first interval, the corresponding opening degree change value can be set to +5 steps. After the electronic expansion valve receives the control instruction, it increases by 5 steps per minute, gradually increasing the valve opening degree by a small margin.

[0118] The embodiments of the present invention determine the opening degree change value based on the sub-interval where the new subcooling degree data is located, for the electronic expansion valve to adjust in combination with the opening degree change value corresponding to this interval. During the operation of the fan at the maximum speed, it realizes the corresponding quantitative adjustment of the opening degree of the electronic expansion valve according to the new subcooling degree data, and ensures the corresponding refrigerating capacity by means of additionally reducing the exhaust temperature.

[0119] Based on any of the above embodiments, controlling the electronic expansion valve to increase the opening degree based on the opening degree change value includes: within a first preset duration, controlling the electronic expansion valve to increase the opening degree according to the opening degree change value, so that the electronic expansion valve maintains the increased opening degree value for a second preset duration.

[0120] Wherein, the first preset duration is greater than the second preset duration.

[0121] It should be noted that the first preset duration is used to indicate the frequency of executing the opening degree change.

[0122] The second preset duration is used to indicate the duration of maintaining the changed opening degree.

[0123] Specifically, the control device of the outdoor unit can also formulate different opening degree adjustment strategies around the opening degree change value and the duration of the opening degree change. That is, the control device of the outdoor unit sends a control instruction including the opening degree change value and the second preset duration to the electronic expansion valve at each first preset duration, to control the electronic expansion valve to increase the opening degree at a certain speed and maintain the corresponding opening degree value after the increase.

[0124] The embodiments of the present invention do not specifically limit the values of the first preset duration and the second preset duration.

[0125] Exemplarily, when the new degree of supercooling is in the range of [4, 6), the first preset duration is 1 minute and the second preset duration is 0 minute. That is, the opening adjustment strategy of the electronic expansion valve is to increase the opening by 10 steps per minute to continuously reduce the exhaust temperature.

[0126] When the new degree of supercooling is in the range of (-∞, 4), the first preset duration is 3 minutes and the second preset duration is 2 minutes. That is, the opening adjustment strategy of the electronic expansion valve is to increase the opening by 10 steps per minute. For every 3 minutes of increasing the opening, it is maintained for 2 minutes to reduce and stabilize the exhaust temperature and determine the corresponding degree of supercooling.

[0127] Based on the sub-interval where the new degree of supercooling data is located, the present invention embodiment decides to execute the adjustment strategy corresponding to the sub-interval, controls the electronic expansion valve to increase the opening with the corresponding opening change value within the first preset duration, and continues for the second preset duration. During the operation of the fan at the maximum speed, the opening of the electronic expansion valve is stably and quantitatively adjusted according to the new degree of supercooling data, preventing its value from jumping back and forth and affecting the stable operation of the air conditioner.

[0128] Based on any of the above embodiments, if it is determined that the degree of supercooling data is in the second interval, controlling the outdoor unit to reduce the fan speed specifically includes: obtaining the second compensation coefficient corresponding to the second target sub-interval according to the second target sub-interval corresponding to the degree of supercooling data.

[0129] Wherein, the second target sub-interval is obtained by dividing the second interval. The second compensation coefficient is greater than zero.

[0130] It should be noted that the control device of the outdoor unit pre-sets N2 points in the second interval for division to obtain N2 + 1 sub-intervals.

[0131] Wherein, N2 is a positive integer greater than or equal to 1. Each sub-interval is correspondingly set with a different second compensation coefficient. And each second compensation coefficient is less than zero, and its value increases as the proximity of the lower limit value of the corresponding sub-interval to the lower limit value of the second interval increases.

[0132] Specifically, in step 102-2, the control device of the outdoor unit takes the sub-interval where the degree of supercooling data is located as the second target sub-interval and obtains the second compensation coefficient corresponding to this sub-interval.

[0133] Based on the current fan speed of the outdoor unit, the degree of supercooling data and the second compensation coefficient, determine the target fan speed.

[0134] Specifically, the control device of the outdoor unit substitutes the obtained current fan speed, degree of supercooling data and second compensation coefficient into the corresponding mathematical model to calculate the target fan speed.

[0135] The mathematical model of the target fan speed in the embodiments of the present invention is not specifically limited. Exemplarily, the calculation formula of the target fan speed is as follows:

[0136] V targe = V + (a2 - Δt) * k2

[0137] Where, V targe is the target fan speed, V is the current fan speed, and Δt is the undercooling data.

[0138] a1 is the temperature coefficient corresponding to the second target sub-interval, and its value is determined by the normal undercooling range of the condenser. Exemplarily, a2 = 8.

[0139] k2 is the second compensation coefficient, and its value is determined by the sub-intervals previously divided for the second interval. Taking N2 equal to 1 as an example, the second interval can be divided into two sub-intervals, namely (8, 10] and (10, +∞], where:

[0140] If Δt ∈ (8, 10], then k2 = -15, that is, the calculation formula of the target fan speed is as follows:

[0141] V targe = V - (8 - Δt) * 15

[0142] If Δt ∈ (10, +∞], then k2 = -20, that is, the calculation formula of the target fan speed is as follows:

[0143] V targe = V - (8 - Δt) * 20

[0144] Based on the target fan speed, the fan speed of the outdoor unit is adjusted.

[0145] Specifically, the control device of the outdoor unit encapsulates the calculated target fan speed into a speed reduction control instruction and sends it to the outdoor unit.

[0146] The outdoor unit receives and responds to the speed reduction control instruction, and reduces the speed to the target fan speed on the basis of the current fan speed. And the target fan speed shall not be less than 0.

[0147] It can be understood that during the process of reducing the fan speed of the outdoor unit, the speed pauses for 30 seconds every time it increases by one minute, and then the undercooling data is judged again to prevent the wind speed from jumping back and forth.

[0148] When the indoor unit is controlled to reduce the fan speed based on the subcooling degree data in the embodiments of the present invention, the second compensation coefficient is determined according to the subinterval where the subcooling degree data is located, and the target fan speed is calculated by combining the current fan speed and the subcooling degree data, so that the outdoor unit can reduce the fan speed to the target fan speed. It realizes the analysis of the load state of the condenser according to the internal and external temperatures of the condenser, and makes corresponding quantitative adjustment of the fan speed according to the subcooling degree data, so that the subcooling degree of the condenser in the refrigeration mode is reduced to the normal subcooling degree range, and the refrigerant is always in a flowing state, saving the refrigeration energy efficiency.

[0149] Figure 2 It is a schematic structural diagram of the control device of the outdoor unit provided by the present invention. On the basis of any of the above embodiments, as Figure 2 shown, the control device of the outdoor unit provided by the embodiments of the present invention includes: a subcooling degree acquisition module 210, a first control module 220-1, and a second control module 220-2, wherein:

[0150] The subcooling degree acquisition module 210 is used to acquire subcooling degree data based on the first temperature and the second temperature of the condenser.

[0151] The first control module 220-1 is used to control the outdoor unit to increase the fan speed if it is determined that the subcooling degree data is in the first interval.

[0152] The second control module 220-2 is used to control the outdoor unit to reduce the fan speed if it is determined that the subcooling degree data is in the second interval.

[0153] Wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the outlet temperature of the condenser in the refrigeration mode. The first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0154] Specifically, the subcooling degree acquisition module 210, the first control module 220-1, and the second control module 220-2 are electrically connected in sequence.

[0155] After the subcooling degree acquisition module 210 determines that the air conditioner starts the refrigeration mode according to the operation information fed back by each component according to the activation instruction, it receives the first temperature and the second temperature collected by the sensing module in the current working cycle, and calculates the subcooling degree data by taking the difference between the first temperature and the second temperature.

[0156] The first control module 220-1 compares the subcooling degree data obtained by the subcooling degree acquisition module 210 with the normal subcooling degree range of the condenser. If it is determined that its value is in the first interval, it sends a speed increase control instruction to the outdoor unit.

[0157] The second control module 220-2 compares the subcooling degree data obtained by the subcooling degree acquisition module 210 with the normal subcooling degree range of the condenser. If it is determined that the value is within the second interval, a speed reduction control instruction is sent to the outdoor unit.

[0158] Optionally, the first control module 220-1 includes a first coefficient acquisition unit, a first speed acquisition unit, and a first control unit, where:

[0159] The first coefficient acquisition unit is configured to obtain a first compensation coefficient corresponding to the first target sub-interval according to the first target sub-interval corresponding to the subcooling degree data.

[0160] The first speed acquisition unit is configured to determine a target fan speed based on the current fan speed of the outdoor unit, the subcooling degree data, and the first compensation coefficient.

[0161] The first control unit is configured to adjust the fan speed of the outdoor unit based on the target fan speed.

[0162] Wherein, the first target sub-interval is obtained by dividing the first interval. The first compensation coefficient is greater than zero.

[0163] Optionally, the first control unit includes a speed control sub-unit, a subcooling degree monitoring sub-unit, and an opening degree control sub-unit, where:

[0164] The speed control sub-unit is configured to control the outdoor unit to adjust the fan speed to the maximum speed when it is determined that the target fan speed is greater than or equal to the maximum rated speed of the outdoor unit.

[0165] The subcooling degree monitoring sub-unit is configured to continuously re-acquire new subcooling degree data based on the first temperature and the second temperature of the condenser.

[0166] The opening degree control sub-unit is configured to control the electronic expansion valve of the outdoor unit to adjust the opening degree when the new subcooling degree data matches the first interval.

[0167] Optionally, the opening degree control sub-unit is specifically configured to control the electronic expansion valve to increase the opening degree according to the opening degree change value within a first preset time period, so that the electronic expansion valve maintains the increased opening degree value for a second preset time period;

[0168] Wherein, the first preset time period is greater than the second preset time period.

[0169] Optionally, the second control module 220-2 includes a second coefficient acquisition unit, a second speed acquisition unit, and a second control unit, where:

[0170] A second coefficient acquisition unit, configured to obtain a second compensation coefficient corresponding to the second target sub-interval according to the second target sub-interval corresponding to the subcooling degree data.

[0171] A second rotational speed acquisition unit, configured to determine a target fan rotational speed based on the current fan rotational speed of the outdoor unit, the subcooling degree data, and the second compensation coefficient.

[0172] A second control unit, configured to adjust the fan rotational speed of the outdoor unit based on the target fan rotational speed.

[0173] Wherein, the second target sub-interval is obtained by dividing the second interval. The second compensation coefficient is greater than zero.

[0174] The control device of the outdoor unit provided by the embodiment of the present invention is configured to execute the control method of the outdoor unit of the present invention above. Its implementation manner is consistent with the implementation manner of the control method of the outdoor unit provided by the present invention, and the same beneficial effects can be achieved, which will not be elaborated here.

[0175] The embodiment of the present invention determines the subcooling degree data based on the first temperature and the second temperature of the condenser, and controls the indoor unit to increase or decrease the fan rotational speed through the subcooling degree data decision, realizing the analysis of the load state of the condenser according to the internal and external temperatures of the condenser, and adaptively adjusting the fan rotational speed of the outdoor unit, so that the condenser under the refrigeration mode always maintains a normal subcooling degree range, ensuring the corresponding refrigeration capacity and saving energy efficiency.

[0176] Figure 3 is a schematic structural diagram of an air conditioner provided by the present invention. On the basis of any of the above embodiments, as Figure 3 shown, the air conditioner includes an indoor unit 310 and an outdoor unit 320. A control processor 321 and a sensing module 322 are provided in the outdoor unit 320, and the sensing module 322 is arranged at the condenser of the outdoor unit 320; 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 321, the control method of the outdoor unit is executed.

[0177] Wherein, the sensing module 322 includes a first module and a second module. The first module is arranged in the middle of the condensing pipe, and the second module is arranged at the air outlet of the condensing pipe.

[0178] Specifically, the air conditioner is composed of an indoor unit 310 body and an outdoor unit 320 body. Among them, the control processor 321 can be integrated into the control development board of the outdoor unit 320 in the form of a chip or a microprocessor. Through the communication connection between the control processor 321 and the outdoor unit 320 and the sensing module 322 respectively, the control of the indoor unit under the refrigeration mode is realized.

[0179] A sensing module 322 also needs to be provided at the condenser pipe in the outdoor unit 320 to collect the temperatures inside and outside the condenser pipe in real time and feedback them to the control processor 321 for logical judgment of the fan speed of the outdoor unit 320 and the opening degree control of the electronic expansion valve. The control processor 321 respectively uses wireless communication technology to transmit signals with the outdoor unit 320 and the sensing module 322.

[0180] The embodiment of the present invention does not specifically limit the number of temperature sensors in the sensing module 322.

[0181] Optionally, the first module and the second module in the sensing module 322 respectively include one temperature sensor provided at the middle part and the air outlet of the condenser pipe, and the control device of the outdoor unit will respectively use the temperature data collected by the two temperature sensors as the first temperature and the second temperature.

[0182] Optionally, the first module and the second module in the sensing module 322 respectively include a plurality of temperature sensors provided at the middle part and the air outlet of the condenser pipe at uniform intervals, and the control device of the outdoor unit uses the temperature data collected by the temperature sensors under each module for summing and averaging to obtain the first temperature and the second temperature.

[0183] Among them, the wireless communication technology includes but is not limited to WIFI wireless cellular signals (2G, 3G, 4G, 5G), Bluetooth, Zigbee and other methods, and the embodiment of the present invention does not specifically limit this.

[0184] The air conditioner of the present invention further includes a memory and a program or instruction stored on the memory and executable on the control processor 321. The above control processor 321 can call the logical instructions in the memory to execute the control method of the outdoor unit of the present invention, and the method includes: obtaining subcooling degree data based on the first temperature and the second temperature of the condenser; if it is determined that the subcooling degree data is in the first interval, controlling the outdoor unit to increase the fan speed; if it is determined that the subcooling degree data is in the second interval, controlling the outdoor unit to decrease the fan speed; wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the air outlet temperature of the condenser in the refrigeration mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0185] In addition, when the logical instructions in the above-mentioned memory can be implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0186] In the embodiments of the present invention, the subcooling degree data is determined based on the first temperature and the second temperature of the condenser. By making a decision based on the subcooling degree data to control the indoor unit to increase or decrease the fan speed, the load state of the condenser is analyzed according to the internal and external temperatures of the condenser, and the fan speed of the outdoor unit is adaptively adjusted, so that the condenser under the refrigeration mode always maintains a normal subcooling degree range, which not only ensures the corresponding refrigerating capacity but also saves energy efficiency.

[0187] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that 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 outdoor unit provided by the above-mentioned various methods. The method includes: obtaining subcooling degree data based on the first temperature and the second temperature of the condenser; if it is determined that the subcooling degree data is in a first interval, controlling the outdoor unit to increase the fan speed; if it is determined that the subcooling degree data is in a second interval, controlling the outdoor unit to decrease the fan speed; where the first temperature is the internal temperature of the condenser under the refrigeration mode, the second temperature is the outlet temperature of the condenser under the refrigeration mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0188] 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 the control method of the outdoor unit provided by the above-mentioned various methods. The method includes: obtaining subcooling degree data based on the first temperature and the second temperature of the condenser; if it is determined that the subcooling degree data is in the first interval, controlling the outdoor unit to increase the fan speed; if it is determined that the subcooling degree data is in the second interval, controlling the outdoor unit to decrease the fan speed; wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the outlet temperature of the condenser in the refrigeration mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser.

[0189] 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. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0190] 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 this understanding, the essence of the above technical solutions, 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.

[0191] 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 outdoor unit, characterized in that, Including: Obtain subcooling data based on the first temperature and the second temperature of the condenser; If it is determined that the subcooling data is in the first interval, control the outdoor unit to increase the fan speed; If it is determined that the subcooling data is in the second interval, control the outdoor unit to decrease the fan speed; Wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the outlet temperature of the condenser in the refrigeration mode; the first interval and the second interval are determined by the normal subcooling range of the condenser; The step of, if it is determined that the subcooling data is in the first interval, controlling the outdoor unit to increase the fan speed specifically includes: According to the first target sub-interval corresponding to the subcooling data, obtain the first compensation coefficient corresponding to the first target sub-interval; Based on the current fan speed of the outdoor unit, the subcooling data, and the first compensation coefficient, determine the target fan speed; Based on the target fan speed, adjust the fan speed of the outdoor unit; Wherein, the first target sub-interval is obtained by dividing the first interval; the first compensation coefficient is greater than zero; The calculation formula of the target fan speed is as follows: V targe = V + (a1 - Δt) * k1 Among them, V targe is the target fan speed, V is the current fan speed, and Δt is the undercooling data; a1 is the temperature coefficient corresponding to the first target sub-interval, and its value is determined by the normal subcooling range of the condenser. Exemplarily, a1 = 8; k1 is the first compensation coefficient, and its value is determined by the sub-intervals pre-divided for the first interval; The step of, if it is determined that the subcooling data is in the second interval, controlling the outdoor unit to decrease the fan speed specifically includes: According to the second target sub-interval corresponding to the subcooling data, obtain the second compensation coefficient corresponding to the second target sub-interval; Based on the current fan speed of the outdoor unit, the subcooling data, and the second compensation coefficient, determine the target fan speed; Based on the target fan speed, adjust the fan speed of the outdoor unit; Wherein, the second target sub-interval is obtained by dividing the second interval; the second compensation coefficient is greater than zero; The calculation formula of the target fan speed is as follows: V targe = V + (a2 - Δt) * k2 Among them, V targe is the target fan speed, V is the current fan speed, and Δt is the undercooling data; a1 is the temperature coefficient corresponding to the second target sub-interval, and its value is determined by the normal subcooling range of the condenser. Exemplarily, a2 = 8; k2 is the second compensation coefficient, and its value is determined by the sub-intervals pre-divided for the second interval.

2. The control method for an outdoor unit according to claim 1, characterized in that, The step of adjusting the fan speed of the outdoor unit based on the target fan speed includes: When it is determined that the target fan speed is greater than or equal to the maximum rated speed of the outdoor unit, control the outdoor unit to adjust the fan speed to the maximum speed; Continue to obtain new subcooling data based on the first temperature and the second temperature of the condenser; When the new subcooling data matches the first interval, control the electronic expansion valve of the outdoor unit to adjust the opening degree.

3. The control method for an outdoor unit according to claim 2, characterized in that, When the new subcooling data matches the first interval, controlling the electronic expansion valve of the outdoor unit to adjust the opening degree specifically includes: According to the new first target sub-interval corresponding to the new subcooling data, obtain the opening degree change value corresponding to the first target sub-interval; Based on the opening degree change value, control the electronic expansion valve to increase the opening degree; Wherein, the new first target sub-interval is obtained by dividing the first interval.

4. The control method for an outdoor unit according to claim 3, characterized in that, Based on the opening degree change value, controlling the electronic expansion valve to increase the opening degree includes: Within a first preset time period, control the electronic expansion valve to increase the opening degree according to the opening degree change value, so that the electronic expansion valve maintains the increased opening degree value for a second preset time period; Wherein, the first preset time period is greater than the second preset time period.

5. A control device for an outdoor unit, characterized in that, Including: A subcooling degree acquisition module, configured to acquire subcooling degree data based on a first temperature and a second temperature of a condenser; A first control module, configured to control the outdoor unit to increase the fan speed if it is determined that the subcooling degree data is within a first interval; A second control module, configured to control the outdoor unit to decrease the fan speed if it is determined that the subcooling degree data is within a second interval; Wherein, the first temperature is the internal temperature of the condenser in the refrigeration mode, and the second temperature is the outlet temperature of the condenser in the refrigeration mode; the first interval and the second interval are determined by the normal subcooling degree range of the condenser; The step of controlling the outdoor unit to increase the fan speed if it is determined that the subcooling degree data is within the first interval specifically includes: According to the first target sub-interval corresponding to the subcooling degree data, to obtain a first compensation coefficient corresponding to the first target sub-interval; Based on the current fan speed of the outdoor unit, the subcooling degree data and the first compensation coefficient, determine the target fan speed; Based on the target fan speed, adjust the fan speed of the outdoor unit; Wherein, the first target sub-interval is obtained by dividing the first interval; the first compensation coefficient is greater than zero; The calculation formula of the target fan speed is as follows: V targe = V + (a1 - Δt) * k1 Among them, V targe is the target fan speed, V is the current fan speed, and Δt is the undercooling data; a1 is the temperature coefficient corresponding to the first target sub-interval, and its value is determined by the normal subcooling degree range of the condenser. Exemplarily, a1 = 8; k1 is the first compensation coefficient, and its value is determined by the sub-intervals pre-divided for the first interval; The step of controlling the outdoor unit to decrease the fan speed if it is determined that the subcooling degree data is within the second interval specifically includes: According to the second target sub-interval corresponding to the subcooling degree data, to obtain a second compensation coefficient corresponding to the second target sub-interval; Based on the current fan speed of the outdoor unit, the subcooling degree data and the second compensation coefficient, determine the target fan speed; Based on the target fan speed, adjust the fan speed of the outdoor unit; Wherein, the second target sub-interval is obtained by dividing the second interval; the second compensation coefficient is greater than zero; The calculation formula of the target fan speed is as follows: V targe = V + (a2 - Δt) * k2 Among them, V targe is the target fan speed, V is the current fan speed, and Δt is the undercooling data; a1 is the temperature coefficient corresponding to the second target sub-interval, and its value is determined by the normal subcooling degree range of the condenser. Exemplarily, a2 = 8; k2 is the second compensation coefficient, and its value is determined by the sub-intervals pre-divided for the second interval.

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 outdoor unit, and the sensing module is arranged at the condenser pipe of the outdoor 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 outdoor unit according to any one of claims 1 to 4. Among them, the sensing module includes a first module and a second module. The first module is arranged in the middle of the condenser pipe, and the second module is arranged at the air outlet of the condenser pipe.

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

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

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