Dual-duct heat pump drying system control method, device and washing machine

Abstract

The present application relates to a kind of double air duct heat pump drying system control method, device and washing machine, wherein the method comprises: after the opening of the equipment drying mode, the working power of each compressor and fan is determined according to the combination mode of compressor and fan in double air duct heat pump drying system;The first cross temperature difference of first inlet and outlet air temperature of double air duct is calculated, and in the case where it is less than the first preset temperature value, the working power of variable frequency compressor and / or variable frequency fan is adjusted according to the first preset rule;The second cross temperature difference of second inlet and outlet air temperature of double air duct is calculated, and in the case where it is less than the second preset temperature value, the working power of variable frequency compressor and / or variable frequency fan is adjusted according to the second preset rule, until the drying is finished after reaching the dry judging condition. By using the present application, the humidity and temperature state of clothes in drying cavity can be accurately determined, so as to intelligently adjust the operating frequency of variable frequency fan and / or compressor, and energy saving can be realized as far as possible under the premise of ensuring drying efficiency.

Description

Technical Field

[0001] This invention relates to the field of home appliance technology, and in particular to a control method, device, and washing machine for a dual-duct heat pump drying system. Background Technology

[0002] In the field of heat pump drying technology, with consumers' increasing demands for drying efficiency and energy-saving performance, traditional single-duct drying systems can no longer meet market needs. Therefore, dual-duct heat pump drying systems, with their independent dual heat sources and duct designs, have become an important development direction for improving drying efficiency and energy saving. This allows the left and right ducts to be controlled independently or collaboratively according to their respective load characteristics, further improving the system's flexibility and adaptability.

[0003] In a dual-duct heat pump drying system, the selection of the compressor and fan directly impacts the drying effect and energy consumption. Currently, various compressor and fan combinations exist on the market, such as dual fixed-frequency compressors paired with dual variable-frequency fans, one side with a fixed-frequency compressor and the other side with a variable-frequency compressor paired with dual fixed-frequency fans, and hybrid combinations of variable-frequency and fixed-frequency fans and compressors. These combinations all demonstrate different drying strategies and energy consumption characteristics. By combining the flexible adjustment of variable-frequency technology with the stable output of fixed-frequency technology, these solutions aim to achieve optimal matching of temperature, airflow, and energy consumption during the drying process.

[0004] However, while the above-mentioned solutions have achieved certain results in improving drying efficiency and energy saving, the specific control strategies and optimization methods for dual-duct heat pump drying systems still require in-depth research and innovation. In particular, how to develop more refined and intelligent drying control algorithms based on the characteristics of different compressor and fan combinations to achieve more efficient energy utilization and superior drying performance is an important direction for current technological development. Summary of the Invention

[0005] To overcome the problems existing in related technologies, a first aspect of the present invention proposes a control method for a dual-duct heat pump drying system. This method is applied to a device equipped with a dual-duct heat pump drying system. Temperature sensors are respectively installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts include a left duct and a right duct respectively connected to the device. Each left and right duct is equipped with a fan and a heat pump assembly that forms a heat pump system with a compressor. The method includes:

[0006] After the drying mode of the equipment is turned on, the working power of each compressor and fan is determined according to the combination of compressor and fan in the dual-duct heat pump drying system.

[0007] After entering the drying and heating mode, the first cross temperature difference between the inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0008] When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, the working power of the variable frequency compressor and / or variable frequency fan is adjusted according to the first preset rule, and the internal circulation drying mode is switched.

[0009] The second cross temperature difference between the inlet and outlet air is calculated based on the temperature sensor readings installed at the inlet and outlet of the left and right air ducts.

[0010] If the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule until the drying condition is met and the drying ends.

[0011] Optionally, when the compressor and fan combination in the dual-duct heat pump drying system is a combination of dual fixed-frequency compressors and dual variable-frequency fans, after the drying mode of the equipment is turned on, the step of determining the operating power of each compressor and fan according to the compressor and fan combination in the dual-duct heat pump drying system includes:

[0012] After the drying mode of the equipment is turned on, the two variable frequency fans are adjusted to run at high frequency, and the two fixed frequency compressors are adjusted to run at a fixed frequency.

[0013] Optionally, the step of adjusting the operating power of the variable frequency compressor and / or variable frequency fan according to the second preset rule when the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, until the drying condition is met and the drying process ends, includes:

[0014] When the temperature difference between the second inlet and outlet air is less than the second preset temperature value, the two variable frequency fans are adjusted to run at low frequency, and the two fixed frequency compressors are kept running at a fixed frequency until the drying condition is met and the drying ends.

[0015] Optionally, in the case where the compressor and fan combination in the dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor, and two fixed-frequency fans, after the drying mode of the equipment is turned on, the step of determining the operating power of each compressor and fan according to the compressor and fan combination in the dual-duct heat pump drying system includes:

[0016] After the drying mode of the equipment is turned on, the variable frequency compressor is adjusted to run at high frequency, and the dual fixed frequency fans and the fixed frequency compressor are adjusted to run at a fixed frequency.

[0017] Optionally, when the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or variable frequency fan according to the first preset rule and switching to the internal circulation drying mode includes:

[0018] When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, the operating frequency of the variable frequency compressor is reduced, the dual fixed frequency fans and the fixed frequency compressor are kept running at a fixed frequency, and the internal circulation drying mode is switched.

[0019] Optionally, in the dual-duct heat pump drying system, when the compressor and fan combination is a combination of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan, and a variable frequency fan, after the drying mode of the equipment is turned on, the step of determining the operating power of each compressor and fan according to the compressor and fan combination in the dual-duct heat pump drying system includes:

[0020] After the drying mode of the equipment is turned on, the first variable frequency compressor and the variable frequency fan are adjusted to run at high frequency, and the second variable frequency compressor and the fixed frequency fan are adjusted to run at a fixed frequency.

[0021] Optionally, when the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or variable frequency fan according to the first preset rule and switching to the internal circulation drying mode includes:

[0022] When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, the operating frequency of the first variable frequency compressor and the variable frequency fan is reduced, the second variable frequency compressor and the fixed frequency fan are kept running at a fixed frequency, and the internal circulation drying mode is switched.

[0023] Optionally, in the dual-duct heat pump drying system, when the compressor and fan are combined in the form of a fixed-frequency fan and a variable-frequency compressor, or a variable-frequency fan and a fixed-frequency compressor, the step of determining the operating power of each compressor and fan according to the combination of the compressor and fan in the dual-duct heat pump drying system after the drying mode is activated includes:

[0024] After the drying mode of the equipment is turned on, the variable frequency compressor and variable frequency fan are adjusted to run at high frequency, and the fixed frequency fan and fixed frequency compressor are adjusted to run at a fixed frequency.

[0025] Optionally, when the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or variable frequency fan according to the first preset rule and switching to the internal circulation drying mode includes:

[0026] When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, the operating frequency of the variable frequency compressor is reduced and the internal circulation drying mode is switched.

[0027] When the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, the step of adjusting the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule until the drying condition is met and the drying process ends includes:

[0028] If the temperature difference between the second inlet and outlet air is less than the second preset temperature value, the operating frequency of the variable frequency fan is reduced until the drying condition is met and the drying process ends.

[0029] A second aspect of this invention provides a control device for a dual-duct heat pump drying system. This device is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are respectively installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts include a left duct and a right duct respectively connected to the equipment. Each left and right duct is equipped with a fan and a heat pump assembly that forms a heat pump system with a compressor. The device includes:

[0030] The first determining module is used to determine the operating power of each compressor and fan according to the combination of compressor and fan in the dual-duct heat pump drying system after the drying mode of the equipment is turned on.

[0031] The first calculation module is used to calculate the first cross temperature difference between the inlet and outlet air based on the temperature sensor measurements set at the inlet and outlet of the left and right air ducts after entering the drying and heating mode.

[0032] The first adjustment module is used to adjust the working power of the variable frequency compressor and / or variable frequency fan according to the first preset rule when the cross temperature difference between the first inlet and outlet air temperatures is less than the first preset temperature value, and switch to the internal circulation drying mode.

[0033] The second calculation module is used to calculate the second cross temperature difference between the inlet and outlet air based on the temperature sensor measurements set at the inlet and outlet of the left and right air ducts.

[0034] The second adjustment module is used to adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule when the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, until the drying condition is met and the drying ends.

[0035] A third aspect of this invention proposes a control method for a dual-duct heat pump drying system. The method is applied to a device equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of each of the left and right ducts of the dual-duct heat pump drying system. Each duct includes a left duct and a right duct respectively connected to the device. The left duct contains a first fan and a first heat pump assembly forming a first heat pump system with a first compressor. The right duct contains a second fan and a second heat pump assembly forming a second heat pump system with a second compressor. At least one of the first fan, the second fan, the first compressor, and the second compressor is a variable frequency drive. The method includes performing the following processing during the drying process:

[0036] The operating frequency of the variable frequency device shall be determined at least according to the first drying mode;

[0037] Based on the temperature sensor readings at the inlet and outlet of the left and right air ducts, determine whether to enter the next drying mode from the first drying mode, or...

[0038] Based on the temperature sensor readings at the inlet and outlet of the left and right air ducts, determine whether to enter the first drying mode;

[0039] The drying process includes at least one of the following modes executed sequentially in time: a drying and heating mode, an internal circulation drying mode, and a drying and judging mode.

[0040] Optionally, determining the operating frequency of the variable frequency device based at least on the first drying mode includes:

[0041] When the first drying mode is the drying and heating mode, the operating frequency of at least one or all of the variable frequency devices is determined to be high frequency.

[0042] Optionally, determining the operating frequency of the variable frequency device based at least on the first drying mode includes:

[0043] The operating frequency of the variable frequency device is determined based on the first drying mode and the arrangement of the variable frequency device in the left and right air ducts.

[0044] Optionally, determining the operating frequency of the variable frequency device based on the first drying mode and the arrangement of the variable frequency device in the left and right air ducts includes:

[0045] In the case where the variable frequency device includes the first compressor in the arrangement, in the drying and heating mode, the operating frequency of the first compressor is determined to be high frequency; in the internal circulation drying mode, the operating frequency of the first compressor is reduced to below high frequency or low frequency; and / or,

[0046] In the arrangement where the variable frequency device includes the first fan, in the drying and heating mode, the operating frequency of the first fan is determined to be high frequency; in the drying and dehydration mode, the operating frequency of the first fan is determined to be low frequency; and / or,

[0047] In the case where the variable frequency device is arranged to include at least one of the first compressor and the second compressor and includes one of the first fan and the second fan, in the drying and heating mode, the operating frequency of at least one of the at least one compressor and the fan is determined to be high frequency; in the internal circulation drying mode, the frequency of at least one of the at least one compressor is reduced to below high frequency; and in the drying and dehydration mode, the operating frequency of at least one fan is determined to be low frequency.

[0048] Optionally, the arrangement includes:

[0049] Only the first fan and the second fan are arranged in the first configuration of the variable frequency equipment;

[0050] Only the first compressor is arranged in the second configuration of the variable frequency device;

[0051] Only the second fan is not in the third arrangement of the variable frequency equipment;

[0052] Only the first compressor and the second fan are arranged in the fourth configuration of the variable frequency device.

[0053] Optionally, determining the operating frequency of the variable frequency device based on the first drying mode and the arrangement of the variable frequency device in the left and right air ducts includes:

[0054] In the first arrangement: in the drying and heating mode, the operating frequency of the variable frequency device is determined to be high frequency; in the drying and dehydration mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0055] In the second arrangement: in the drying and heating mode, the operating frequency of the variable frequency device is set to high frequency; in the internal circulation drying mode, the operating frequency of the variable frequency device is reduced to below high frequency; and in the drying and drying judgment mode, the operating frequency of the variable frequency device is set to low frequency; and / or,

[0056] In the third arrangement: in the drying and heating mode, at least the first fan and the first compressor are determined to be at high frequency; in the internal circulation drying mode, at least the operating frequency of the first fan and the first compressor is determined to be below high frequency; in the drying and drying judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0057] In the fourth arrangement: in the drying and heating mode, the operating frequency of the variable frequency device is determined to be high frequency; in the internal circulation drying mode, the operating frequency of the first compressor is determined to be below high frequency or low frequency; in the drying and drying judgment mode, the operating frequency of the second fan is determined to be low frequency; and / or,

[0058] In any arrangement and in any of the drying heating mode, internal circulation drying mode and drying judgment mode, the equipment other than the variable frequency device shall be kept to operate at a fixed frequency.

[0059] Optionally, determining whether to enter the next drying mode of the first drying mode based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts includes:

[0060] Based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts, the cross temperature difference between the first inlet and outlet air under the first drying mode is calculated.

[0061] If the temperature difference between the first inlet and outlet air is less than the first preset temperature value, then proceed to the next drying mode;

[0062] The step of determining whether to enter the first drying mode based on the temperature sensor values ​​installed at the inlet and outlet of the left and right air ducts includes:

[0063] Based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts, calculate the cross temperature difference between the second inlet and outlet air under the previous drying mode of the first drying mode;

[0064] If the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, then the process will switch from the previous drying mode to the first drying mode.

[0065] The fourth aspect of the present invention provides a washing machine, wherein the washing machine is equipped with a dual-duct heat pump drying system, and temperature sensors are respectively installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system; the washing machine uses the method described in any one of the above method embodiments, or the dual-duct heat pump drying system control device described in the above device embodiments to control the dual-duct heat pump drying system of the washing machine.

[0066] The technical solution of this invention is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of each of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts form air circulation paths with the interior of the equipment (e.g., the clothes handling drum of a washing machine) through their respective inlets and outlets. After the drying mode is activated, the operating power of each compressor and fan is determined according to the combination of the compressor and fan in the dual-duct heat pump drying system. After entering the drying and heating mode, the first cross-temperature difference between the inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right ducts. If the first cross-temperature difference is less than a first preset temperature value, the operating power of the variable frequency compressor and / or variable frequency fan is adjusted according to a first preset rule, and the system switches to internal circulation drying mode. The second cross-temperature difference between the inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right ducts. If the second cross-temperature difference is less than a second preset temperature value, the operating power of the variable frequency compressor and / or variable frequency fan is adjusted according to a second preset rule until the drying condition is met, at which point drying ends. The technical solution of this invention can accurately reflect the humidity and temperature status of the clothes in the drying chamber by real-time monitoring and comparison of the temperature difference between the air inlet and outlet. This allows for intelligent adjustment of the operating frequency of the variable frequency fan and / or compressor, achieving energy saving as much as possible while ensuring drying efficiency.

[0067] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0068] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0069] Figure 1 This is a schematic flowchart illustrating a control method for a dual-duct heat pump drying system according to an exemplary embodiment;

[0070] Figure 2 This is a schematic diagram of a dual-duct heat pump drying system according to an exemplary embodiment.

[0071] Figure 3 This is a schematic diagram of another dual-duct heat pump drying system structure according to an exemplary embodiment;

[0072] Figure 4 This is a schematic flowchart illustrating a control method for a dual-duct heat pump drying system according to an exemplary embodiment;

[0073] Figure 5 This is a schematic flowchart illustrating a control method for a dual-duct heat pump drying system according to an exemplary embodiment;

[0074] Figure 6 This is a schematic flowchart illustrating a control method for a dual-duct heat pump drying system according to an exemplary embodiment;

[0075] Figure 7 This is a schematic flowchart illustrating a control method for a dual-duct heat pump drying system according to an exemplary embodiment;

[0076] Figure 8 This is a structural block diagram of a dual-duct heat pump drying system control device according to an exemplary embodiment. Detailed Implementation

[0077] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0078] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0079] This invention proposes a novel control method for a dual-duct heat pump drying system. This method fully considers the operating characteristics and advantages of different compressor and fan combinations. By optimizing the inlet and outlet air temperature cross-judgment algorithm and the frequency adjustment strategy for the variable frequency fan and compressor, precise control and dynamic optimization of the drying process are achieved. The implementation of this technology will significantly improve the energy efficiency ratio and drying efficiency of the dual-duct heat pump drying system, resulting in a more efficient, energy-saving, and intelligent drying effect, while also promoting the further development and innovation of heat pump drying technology. The following description refers to specific embodiments.

[0080] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided, referring to... Figure 1 The methods include:

[0081] 101: After the equipment drying mode is turned on, determine the working power of each compressor and fan according to the combination of compressor and fan in the dual-duct heat pump drying system.

[0082] The dual-duct heat pump drying system control provided in this application embodiment is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts form air circulation paths with the interior of the equipment (e.g., the clothes handling drum of a washing machine) through their respective inlets and outlets. It should be noted that this equipment can be any suitable device such as a washing machine or dryer.

[0083] The compressor and fan combinations in a dual-duct heat pump drying system can include, but are not limited to: dual fixed-frequency compressors paired with dual variable-frequency fans; one side fixed-frequency compressor and one side variable-frequency compressor paired with dual fixed-frequency fans; one set of variable-frequency fans and variable-frequency compressors paired with one set of fixed-frequency fans and variable-frequency compressors; and a combination of one set of fixed-frequency fans and variable-frequency compressors paired with one set of variable-frequency fans and fixed-frequency compressors. Regardless of the combination, temperature sensors, also known as temperature sensing bulbs, are installed at the inlet and outlet of both the left and right ducts. This structure, with temperature sensing bulbs at the inlet and outlet of both ducts, allows for real-time measurement and recording of the inlet and outlet air temperatures. The operating system of the equipment calculates the cross-temperature difference between the inlet and outlet air based on these temperatures, and efficiently and accurately controls the operating frequency of the compressor and / or fan according to this cross-temperature difference. It should be noted that the above are only four exemplary compressor and fan combinations. In actual implementation, those skilled in the art can flexibly configure the compressor and fan combinations in the dual-duct heat pump drying system according to actual needs.

[0084] After the drying mode is activated, the compressor and fan will start. Following startup, the operating power of the compressor and fan needs to be flexibly adjusted based on their combination. Different combinations of the compressor and fan in a dual-duct heat pump drying system require different adjustment rules for their operating power. The equipment's operating system has preset adjustment rules for various combinations; therefore, once the combination is determined, the operating frequency adjustment rules for the compressor and fan can be established. The operating system can preset high, medium, and low frequency values ​​for the compressor and fan, respectively. When subsequent adjustments are needed, the required adjustment level can be determined, and the compressor or fan can be adjusted to the required operating frequency.

[0085] For example: When the compressor and fan combination of the dual-duct heat pump drying system is a combination of two fixed-frequency compressors and two variable-frequency fans, the variable-frequency fans on both sides are adjusted to operate at high frequency (e.g., higher than the set frequency); when the compressor and fan combination of the dual-duct heat pump drying system is a combination of one fixed-frequency compressor and one variable-frequency compressor with two fixed-frequency fans, the variable-frequency compressor on one side is adjusted to operate at high frequency; when the compressor and fan combination of the dual-duct heat pump drying system is a combination of one variable-frequency fan and one variable-frequency compressor with one fixed-frequency fan, the variable-frequency fan and one variable-frequency compressor on one side are adjusted to operate at high frequency; when the compressor and fan combination of the dual-duct heat pump drying system is a combination of one fixed-frequency fan and one variable-frequency compressor with one variable-frequency fan and one fixed-frequency compressor, the variable-frequency fans and one variable-frequency compressor on both sides are adjusted to operate at high frequency.

[0086] A schematic diagram of an exemplary dual-duct heat pump drying system is shown below. Figure 2 As shown. This dual-duct heat pump drying system consists of dual fixed-frequency compressors paired with dual variable-frequency fans, from... Figure 2 As can be seen, temperature sensors (specifically, two outlet temperature sensors and two inlet temperature sensors) are installed at the inlet and outlet of the left and right air ducts. The dual-duct heat pump drying system, with a fixed-frequency compressor on one side and a variable-frequency compressor on the other, paired with dual fixed-frequency fans, is similar.

[0087] Another exemplary dual-duct heat pump drying system structure diagram is shown below. Figure 3 As shown. This dual-duct heat pump drying system consists of a set of variable frequency fans and variable frequency compressors paired with a set of fixed frequency fans and variable frequency compressors. Figure 3 As can be seen, temperature sensors (specifically, two outlet temperature sensors and two inlet temperature sensors) are also installed at the inlet and outlet of both the left and right air ducts. A dual-duct heat pump drying system consisting of a fixed-frequency fan and a variable-frequency compressor paired with a variable-frequency fan and a fixed-frequency compressor is similar.

[0088] It should be noted that the number of temperature sensors installed at the air outlets and inlets of the left and right channels of the dual-duct heat pump drying system is not limited to one. Two or three temperature sensors can be installed at each outlet, and the number of temperature sensors installed at each outlet can also be different, as long as the temperature at the air inlet and outlet of the air duct is collected in real time.

[0089] The structure provided in this optional embodiment, which sets sensors at the dual-channel inlet and outlet of the dual-duct heat pump drying system, has low structural complexity and low cost.

[0090] 102: After entering the drying and heating mode, the cross temperature difference between the first inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0091] Temperature sensors installed at both the inlet and outlet of the two channels can detect temperature values, and the signals returned by the temperature sensors are all electrical signals. An operating system is configured in the system to analyze the electrical signals uploaded by each temperature sensor to obtain the temperature value. The temperature values ​​of the two inlets and two outlets are calculated according to preset calculation rules to obtain the first cross-temperature difference between the inlet and outlet air.

[0092] An example method for calculating the cross temperature difference between the first inlet and outlet air using temperature values ​​from four sensors can be:

[0093] Calculate the temperature difference between the inlet of the first air duct and the outlet of the second air duct, and the temperature difference between the inlet of the second air duct and the outlet of the first air duct. The average of the two temperature differences is determined as the first inlet and outlet air temperature cross-temperature difference.

[0094] 103: When the temperature difference between the inlet and outlet air is less than the first preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the first preset rule, and switch to the internal circulation drying mode.

[0095] If the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, the drying temperature is determined to be reached, and the system switches to internal circulation drying mode. Step 102 is executed repeatedly, and it is determined whether the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, until the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, at which point step 103 is executed.

[0096] The first preset temperature value can be represented as T1. The first preset temperature value can be flexibly set by those skilled in the art, and there are no specific restrictions on this in the embodiments of this application.

[0097] In a dual-duct heat pump drying system, different combinations of the compressor and fan result in different first rules for adjusting the operating power of the compressor and fan. The equipment's operating system has preset first rules corresponding to various combinations. Therefore, after determining the combination, the first preset rules for the operating frequency of the compressor and fan can be determined. The operating power of the variable frequency compressor and / or variable frequency fan can then be adjusted according to the determined first preset rules.

[0098] Adjusting the operating power of the variable frequency compressor and / or variable frequency fan according to the first preset rule can keep the drying temperature of the dual-duct heat pump drying system within a specific drying temperature range without affecting the drying efficiency.

[0099] 104: Calculate the cross temperature difference between the second inlet and outlet air based on the temperature sensor readings at the inlet and outlet of the left and right air ducts.

[0100] The cross temperature difference between the second inlet and outlet air can be calculated using the same method as the cross temperature difference between the first inlet and outlet air, and will not be elaborated here.

[0101] After calculating the cross-temperature difference between the second inlet and outlet air temperatures, it is determined whether it is less than the second preset temperature value. If it is less, it is determined that the drying stage has been reached, and the operating power of the variable frequency compressor and / or variable frequency fan can be reduced to save energy and reduce wear and tear on the dried items such as clothing. If it is not less than the second preset temperature value, step 104 is repeated until the cross-temperature difference between the second inlet and outlet air temperatures is less than the second preset temperature value, at which point step 105 is executed. The second preset temperature value can be represented as T2, and the second preset temperature value can be flexibly set by those skilled in the art; no specific limitation is made in this embodiment.

[0102] 105: If the cross temperature difference between the second inlet and outlet air temperatures is less than the second preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule until the drying condition is met and the drying ends.

[0103] In a dual-duct heat pump drying system, different combinations of the compressor and fan necessitate different second rules for adjusting their operating power. The equipment's operating system has preset second rules corresponding to various combinations. Therefore, once the combination is determined, the second preset rules for the compressor and fan's operating frequencies can be determined, and the operating power of the variable frequency compressor and / or variable frequency fan can be adjusted according to these rules.

[0104] The dual-duct heat pump drying system control method provided in this application, after the equipment drying mode is activated, determines the operating power of each compressor and fan based on the combination of compressors and fans in the dual-duct heat pump drying system; after entering the drying heating mode, calculates the first cross-temperature difference between inlet and outlet air based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts; if the first cross-temperature difference between inlet and outlet air is less than a first preset temperature value, adjusts the operating power of the variable frequency compressor and / or variable frequency fan according to a first preset rule, and switches to the internal circulation drying mode; calculates the second cross-temperature difference between inlet and outlet air based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts; if the second cross-temperature difference between inlet and outlet air is less than a second preset temperature value, adjusts the operating power of the variable frequency compressor and / or variable frequency fan according to a second preset rule until the drying condition is met, and then the drying ends. The technical solution of this invention, by real-time monitoring and comparison of the temperature difference between the inlet and outlet air vents, can accurately reflect the humidity and temperature state of the clothes inside the drying chamber, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor, achieving energy saving as much as possible while ensuring drying efficiency.

[0105] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided, referring to... Figure 4 The method includes:

[0106] 401: After the equipment drying mode is turned on, adjust the two variable frequency fans to run at high frequency and adjust the two fixed frequency compressors to run at a fixed frequency.

[0107] The dual-duct heat pump drying system control method provided in this embodiment is applied to equipment equipped with a dual-duct heat pump drying system, where temperature sensors are installed at the inlet and outlet of the left and right ducts respectively. The compressor and fan combination in the dual-duct heat pump drying system is a combination of dual fixed-frequency compressors and dual variable-frequency fans. This embodiment uses a washing machine as an example for illustration. A schematic diagram of the dual-duct heat pump drying system with dual fixed-frequency compressors and dual variable-frequency fans is shown below. Figure 2 As shown.

[0108] When the washing machine's drying mode is activated, the dual fixed-frequency compressors, combined with the dual variable-frequency fans, adjust the two variable-frequency fans to operate at a high frequency to enter the drying and heating mode, drying and heating the inside of the washing machine drum.

[0109] 402: After entering the drying and heating mode, the cross temperature difference between the first inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0110] Step 402 is executed to dry and heat up the inner drum of the washing machine, and the first cross temperature difference between the inlet and outlet air is calculated according to a specific time interval, and it is determined whether the first cross temperature difference between the inlet and outlet air is greater than or equal to the first preset temperature value T1.

[0111] If the temperature difference between the first inlet and outlet air is greater than or equal to the first preset temperature value T1, it is determined that the drying temperature has not been reached, and step 402 is continued for drying and heating. Otherwise, the next step 403 is performed.

[0112] 403: When the temperature difference between the inlet and outlet air is less than the first preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the first preset rule, and switch to the internal circulation drying mode.

[0113] Once the drying temperature is reached, there is no need to adjust the operating power of the inverter compressor and / or inverter fan in this step; simply switch directly to the internal circulation drying mode.

[0114] 404: Calculate the cross temperature difference between the second inlet and outlet air based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0115] The cross temperature difference between the second inlet and outlet air is calculated at specific time intervals, and it is determined whether the cross temperature difference is greater than or equal to the second preset temperature value T2. If the cross temperature difference is greater than or equal to the second preset temperature value T2, it is determined that the drying temperature has not been reached, and step 404 is continued for drying. If the cross temperature difference is less than the second preset temperature value T2, the next step is executed.

[0116] 405: When the temperature difference between the second inlet and outlet air is less than the second preset temperature value, adjust the two variable frequency fans to run at a low frequency (e.g., lower than the set frequency) and maintain the two fixed frequency compressors to run at a fixed frequency until the drying condition is met and the drying ends.

[0117] When the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value T2, the drying temperature is determined to have been reached. The variable frequency fans on both sides are then adjusted to operate at low frequency to save energy and reduce wear and tear on the clothing. Once the drying condition is met, the drying process ends, completing the control of the dual-duct heat pump drying system for this drying process. The drying condition can be flexibly set by those skilled in the art; this embodiment does not impose specific limitations on it. For example, it can be set to continue drying for a specific time after reaching the drying temperature to determine that the drying condition has been met.

[0118] The following is a specific example to illustrate... Figure 4 The control method of the dual-duct heat pump drying system shown in the figure will be explained.

[0119] This specific example illustrates the control of a dual-duct heat pump drying system in a washing machine. The dual-duct heat pump drying system is a combination of dual fixed-frequency compressors and dual variable-frequency fans, with temperature sensors installed at the inlet and outlet of each of the left and right ducts. The specific steps include:

[0120] S1: Drying mode activated.

[0121] S2: Adjust the two fixed-frequency fans to operate at high frequency.

[0122] S3: Enter drying and heating mode.

[0123] S4: Determine if the cross temperature difference of the inlet air is greater than T1; if yes, return to execute S3; if no, execute S5.

[0124] In step S4, the cross-temperature difference between the first inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the first preset temperature value T1 to determine whether the drying temperature has been reached. If the cross-temperature difference of the first inlet air temperature is less than or equal to T1, step S5 is executed to confirm that the drying temperature has been reached. It should be noted that by adjusting the value of T1 in this step, the drying temperature can be determined to be reached when the cross-temperature difference of the first inlet air temperature is less than T1.

[0125] S5: Determine that the drying temperature has been reached.

[0126] S6: Enter internal circulation drying mode.

[0127] S7: Determine if the cross temperature difference of the inlet air is less than T2; if not, return to execute S6; if yes, execute S8.

[0128] S7 calculates the cross temperature difference between the second inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system, and compares it with the second preset temperature value T2 to determine whether the drying temperature has been reached.

[0129] If the cross temperature difference between the second inlet air temperature and T2 is less than T2, execute S8 to determine that the dry temperature has been reached.

[0130] S8: Determine that the conditions for judgment have been met.

[0131] The drying conditions can be flexibly set by those skilled in the art. In this application embodiment, no specific restrictions are imposed. For example, it can be set to determine that the drying conditions have been met when the drying temperature is reached; or it can be set to determine that the drying conditions have been met after a certain period of time has elapsed since the drying temperature was reached.

[0132] S9: End drying mode.

[0133] In this embodiment, temperature sensors are installed at the air inlets and outlets of the dual-duct heat pump drying system on both sides to measure and record the inlet and outlet temperatures in real time, monitor temperature differences, and achieve efficient energy utilization and precise process control based on the cross-temperature difference between the inlet and outlet. The system's operating status is determined by comparing the temperature difference between the inlet and outlet (i.e., inlet and outlet temperatures), and the operating parameters of relevant equipment (such as compressors and fans) and the drying control process are adjusted accordingly. Temperature sensors are installed at the air inlets and outlets of the drying, cooling, or heat exchange systems to measure and record the inlet and outlet temperatures in real time. Furthermore, the frequency of the variable frequency fan and / or compressor is controlled based on the cross-temperature difference between the inlet and outlet temperatures. This control method can automatically adjust the drying strategy according to the different compressor (fixed frequency / variable frequency) and fan (fixed frequency / variable frequency) configurations in the left and right ducts, achieving precise temperature and humidity control to achieve the desired drying and desiccation objectives.

[0134] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided, referring to... Figure 5 The method includes:

[0135] 501: After the equipment drying mode is turned on, adjust the variable frequency compressor to run at high frequency, and adjust the dual fixed frequency fans and fixed frequency compressor to run at a fixed frequency.

[0136] The dual-duct heat pump drying system control method provided in this embodiment is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of the left and right ducts, respectively. The compressor and fan combination in the dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor, and two fixed-frequency fans. This embodiment uses a washing machine as an example for illustration. A schematic diagram of the dual-duct heat pump drying system with a combination of two fixed-frequency compressors and two variable-frequency fans is shown below. Figure 2 As shown.

[0137] When the washing machine is in dry mode, both compressors and fans on both sides are turned on. Adjust one side of the inverter compressor to run at high frequency, and adjust the dual fixed-frequency fans and fixed-frequency compressor to run at a fixed frequency to enter the drying and heating mode, and dry and heat the inside of the washing machine drum.

[0138] 502: After entering the drying and heating mode, the cross temperature difference between the first inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0139] Step 502 is executed to dry and heat up the inner drum of the washing machine, and the first cross temperature difference between the inlet and outlet air is calculated at a specific time interval. It is then determined whether the first cross temperature difference between the inlet and outlet air is greater than or equal to the first preset temperature value T1.

[0140] If the temperature difference between the first inlet and outlet air is greater than or equal to the first preset temperature value T1, it is determined that the drying temperature has not been reached, and step 502 is continued for drying and heating. Otherwise, the next step 503 is performed.

[0141] 503: When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, the operating frequency of the variable frequency compressor is reduced, the dual fixed frequency fans and fixed frequency compressor are kept running at a fixed frequency, and the internal circulation drying mode is switched.

[0142] Once the drying temperature is reached, the operating frequency of the variable frequency compressor is gradually reduced, while the operating frequencies of the dual fixed frequency fans and the fixed frequency compressor remain unchanged, so that the drying temperature is kept within the preset drying temperature operating range.

[0143] 504: Calculate the cross temperature difference between the second inlet and outlet air based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0144] The cross temperature difference between the second inlet and outlet air is calculated at specific time intervals, and it is determined whether the cross temperature difference is greater than or equal to the second preset temperature value T2. If the cross temperature difference is greater than or equal to the second preset temperature value T2, it is determined that the drying temperature has not been reached, and step 504 is continued for drying. If the cross temperature difference is less than the second preset temperature value T2, the next step 505 is executed.

[0145] 505: If the cross temperature difference between the second inlet and outlet air temperatures is less than the second preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule until the drying condition is met and the drying ends.

[0146] The second preset rule can be set to keep the variable frequency compressor running at a low frequency, while the operating frequencies of the dual fixed frequency fans and the fixed frequency compressor remain unchanged until the drying condition is met, at which point the drying process ends. Since this drying state does not require much heat, the low-frequency operation of the variable frequency compressor is sufficient to meet the heat demand, thus saving energy.

[0147] The dual-duct heat pump drying system control method provided in this application embodiment installs temperature sensors at the air inlets and outlets of the two ducts on both sides of the dual-duct heat pump drying system to measure and record the inlet and outlet temperatures in real time, monitor temperature differences, and achieve efficient energy utilization and precise process control based on the cross-temperature difference between the inlet and outlet. By comparing the temperature difference between the inlet and outlet (i.e., inlet and outlet temperatures), the system's operating status is determined, and the operating parameters of relevant equipment (such as compressors and fans) and the drying control process are adjusted accordingly. Temperature sensors are installed at the air inlets and outlets of the drying, cooling, or heat exchange system to measure and record the inlet and outlet temperatures in real time. Furthermore, the frequency of the variable frequency fan and / or compressor is controlled based on the cross-temperature difference between the inlet and outlet. The control method can automatically adjust the drying strategy according to the different compressor (fixed frequency / variable frequency) and fan (fixed frequency / variable frequency) configurations of the left and right ducts, achieving precise temperature and humidity control to achieve the expected drying and desiccation objectives.

[0148] The following is a specific example to illustrate... Figure 5 The control method of the dual-duct heat pump drying system shown in the figure will be explained.

[0149] This specific example illustrates the control of a dual-duct heat pump drying system in a washing machine. The dual-duct heat pump drying system consists of a fixed-frequency compressor, a variable-frequency compressor, and two fixed-frequency fans (i.e., a fixed-frequency compressor on one side and a variable-frequency compressor on the other side with two fixed-frequency fans). Temperature sensors are installed at the inlet and outlet of each duct. The specific steps include:

[0150] S1: Drying mode activated.

[0151] S2: Turn on both compressors and fans.

[0152] S3: Adjust one side of the inverter compressor to run at high frequency.

[0153] S4: Enter drying and heating mode.

[0154] S5: Determine if the cross temperature difference of the inlet air is greater than T1; if yes, return to execute S4; if no, execute S6.

[0155] In step S5, the cross-temperature difference between the first inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the first preset temperature value T1 to determine whether the drying temperature has been reached. If the cross-temperature difference between the first inlet air temperatures is less than or equal to T1, step S6 is executed to confirm that the drying temperature has been reached. It should be noted that by adjusting the value of T1 in this step, the drying temperature can be determined to be reached when the cross-temperature difference between the first inlet air temperatures is less than T1.

[0156] S6: Determine that the drying temperature has been reached.

[0157] S7: Gradually reduce the frequency of the inverter compressor to maintain its drying temperature at the drying temperature.

[0158] S8: Enter internal circulation drying mode.

[0159] S9: Determine if the cross temperature difference of the inlet air is less than T2; if not, return to execute S8; if yes, execute S10.

[0160] S9 calculates the cross temperature difference between the second inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system, and compares it with the second preset temperature value T2 to determine whether the drying temperature has been reached.

[0161] If the cross temperature difference between the second inlet air temperature and T2 is less than T2, execute S10 to determine that the dryness test temperature has been reached.

[0162] S10: Determine that the conditions for judgment have been met.

[0163] The drying conditions can be flexibly set by those skilled in the art. In this application embodiment, no specific restrictions are imposed. For example, it can be set to determine that the drying conditions have been met when the drying temperature is reached; or it can be set to determine that the drying conditions have been met after a certain period of time has elapsed since the drying temperature was reached.

[0164] S11: End drying mode.

[0165] The dual-duct heat pump drying system control method provided in this application accurately reflects the humidity and temperature status of the clothes inside the drying chamber by real-time monitoring and comparison of the temperature difference between the inlet and outlet air vents, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only achieves precise temperature control and airflow adjustment during the drying process, but also ensures accurate determination of the drying endpoint, avoiding over-drying or under-drying problems.

[0166] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided, referring to... Figure 6 The method includes:

[0167] 601: After the equipment drying mode is turned on, adjust the first variable frequency compressor and variable frequency fan to run at high frequency, and adjust the other side variable frequency compressor and fixed frequency fan to run at a fixed frequency.

[0168] The dual-duct heat pump drying system control method provided in this embodiment is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of the left and right ducts, respectively. The compressor and fan combination in the dual-duct heat pump drying system is a combination of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan, and a variable frequency fan (i.e., a combination of a variable frequency fan and a variable frequency compressor paired with a fixed frequency fan and a variable frequency compressor). This embodiment uses a washing machine as an example for illustration. A schematic diagram of the dual-duct heat pump drying system structure of the washing machine in this example is shown below. Figure 3 As shown.

[0169] When the washing machine is in drying mode, both compressors and fans on both sides are turned on. The inverter compressor (i.e., the first inverter compressor) and inverter fan on one side are adjusted to run at high frequency, while the second inverter compressor and fixed frequency fan are adjusted to run at a fixed frequency to enter the drying and heating mode and dry and heat the inside of the washing machine drum.

[0170] 602: After entering the drying and heating mode, the cross temperature difference between the first inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0171] Step 602 involves drying and heating the inner drum of the washing machine, and calculating the first cross-temperature difference between the inlet and outlet air at specific time intervals. It is then determined whether this first cross-temperature difference is greater than or equal to the first preset temperature value T1. If the first cross-temperature difference is greater than or equal to the first preset temperature value T1, it is determined that the drying temperature has not been reached, and step 602 continues to dry and heat the drum. Otherwise, the next step, 603, is performed.

[0172] 603: When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, reduce the operating power of the first variable frequency compressor and variable frequency fan, maintain the second variable frequency compressor and fixed frequency fan at a fixed frequency, and switch to the internal circulation drying mode.

[0173] Once the drying temperature is reached, the operating frequency of the first variable frequency compressor and the variable frequency fan is reduced in an orderly manner, while the operating power of the second variable frequency compressor and the fixed frequency fan remains unchanged, so that the drying temperature is kept within the preset drying temperature operating range.

[0174] 604: Calculate the cross temperature difference between the second inlet and outlet air based on the temperature sensor readings at the inlet and outlet of the left and right air ducts.

[0175] The cross temperature difference between the second inlet and outlet air is calculated at specific time intervals, and it is determined whether the cross temperature difference is greater than or equal to the second preset temperature value T2. If the cross temperature difference is greater than or equal to the second preset temperature value T2, it is determined that the drying temperature has not been reached, and step 604 is continued for drying. If the cross temperature difference is less than the second preset temperature value T2, the next step 605 is executed.

[0176] 605: If the cross temperature difference between the second inlet and outlet air temperatures is less than the second preset temperature value, adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule until the drying condition is met and the drying ends.

[0177] When the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, the drying stage is determined to have been reached. The second preset rule can be set to further reduce the operating power of the variable frequency fan and the first variable frequency compressor until the drying condition is met, at which point drying ends. Further reducing the operating power of the variable frequency fan in the later stage of drying not only saves energy but also reduces wear and tear on clothing. The second preset rule can also be set to maintain the variable frequency fan and the first variable frequency compressor at a certain low power operation.

[0178] The following is a specific example to illustrate... Figure 6 The control method of the dual-duct heat pump drying system shown in the figure will be explained.

[0179] This specific example illustrates the control of a dual-duct heat pump drying system in a washing machine. The dual-duct heat pump drying system consists of a first variable-frequency compressor, a second variable-frequency compressor, a fixed-frequency fan, and a combination of a variable-frequency fan and a variable-frequency compressor (i.e., a combination of a variable-frequency fan and a variable-frequency compressor paired with a fixed-frequency fan and a variable-frequency compressor). Temperature sensors are installed at the inlet and outlet of each of the left and right ducts. The specific steps include the following:

[0180] S1: Drying mode activated.

[0181] S2: Turn on both compressors and fans.

[0182] S3: Adjust the high-frequency operation of the variable frequency compressor and variable frequency fan on one side.

[0183] S4: Enter drying and heating mode.

[0184] S5: Determine if the cross temperature difference of the inlet air is greater than T1; if yes, return to execute S4; if no, execute S6.

[0185] In step S5, the cross-temperature difference between the first inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the first preset temperature value T1 to determine whether the drying temperature has been reached. If the cross-temperature difference between the first inlet air temperatures is less than or equal to T1, step S6 is executed to confirm that the drying temperature has been reached. It should be noted that by adjusting the value of T1 in this step, the drying temperature can be determined to be reached when the cross-temperature difference between the first inlet air temperatures is less than T1.

[0186] S6: Determine that the drying temperature has been reached.

[0187] S7: Orderly reduce the frequency of the variable frequency compressor and variable frequency fan on the side that has been raised, so that the drying temperature is maintained at the drying temperature.

[0188] S8: Enter internal circulation drying mode.

[0189] S9: Determine if the cross temperature difference of the inlet air is less than T2; if not, return to execute S8; if yes, execute S10.

[0190] S9 calculates the cross temperature difference between the second inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system, and compares it with the second preset temperature value T2 to determine whether the drying temperature has been reached and the later stage of drying has been reached.

[0191] If the cross temperature difference between the second air inlet and T2 is less than T2, execute S10 to determine that the drying temperature has been reached, thus reaching the later stage of drying.

[0192] S10: Keep the variable frequency compressor and variable frequency fan running at low frequency.

[0193] S11: Determine that the conditions for judgment have been met.

[0194] The drying conditions can be flexibly set by those skilled in the art. In this application embodiment, no specific restrictions are imposed. For example, it can be set to determine that the drying conditions have been met when the drying temperature is reached; or it can be set to determine that the drying conditions have been met after a certain period of time has elapsed since the drying temperature was reached.

[0195] S12: End drying mode.

[0196] The dual-duct heat pump drying system control method provided in this application accurately reflects the humidity and temperature status of the clothes inside the drying chamber by real-time monitoring and comparison of the temperature difference between the inlet and outlet air vents, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only achieves precise temperature control and airflow adjustment during the drying process, but also ensures accurate determination of the drying endpoint, avoiding over-drying or under-drying problems.

[0197] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided, referring to... Figure 7 The method includes:

[0198] 701: After the equipment drying mode is turned on, adjust the variable frequency compressor and variable frequency fan to run at high frequency, and adjust the fixed frequency fan and fixed frequency compressor to run at a fixed frequency.

[0199] The dual-duct heat pump drying system control method provided in this embodiment is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are installed at the inlet and outlet of the left and right ducts, respectively. The compressor and fan combination in the dual-duct heat pump drying system is a combination of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan, and a variable frequency fan (i.e., a combination of a fixed frequency fan and a variable frequency compressor paired with a variable frequency fan and a fixed frequency compressor). This embodiment uses a washing machine as an example for illustration. A schematic diagram of the dual-duct heat pump drying system structure of the washing machine in this example is shown below. Figure 3 As shown.

[0200] When the washing machine is in dry mode, both compressors and fans on both sides are turned on. The variable frequency compressors and variable frequency fans on both sides are adjusted to run at high frequency, while the fixed frequency compressors and fixed frequency fans on both sides run at a fixed frequency to enter the drying and heating mode, and dry and heat up the inside of the washing machine drum.

[0201] 702: After entering the drying and heating mode, the cross temperature difference between the first inlet and outlet air is calculated based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts.

[0202] Step 702 involves drying and heating the inner drum of the washing machine, and calculating the first cross-temperature difference between the inlet and outlet air at specific time intervals. It is then determined whether this first cross-temperature difference is greater than or equal to the first preset temperature value T1. If the first cross-temperature difference is greater than or equal to the first preset temperature value T1, it is determined that the drying temperature has not been reached, and step 702 continues to dry and heat the drum. Otherwise, the next step 703 is performed.

[0203] 703: When the temperature difference between the first inlet and outlet air is less than the first preset temperature value, reduce the operating frequency of the inverter compressor and switch to the internal circulation drying mode.

[0204] Once the drying temperature is reached, the frequency of one side of the inverter compressor is gradually reduced, while the operating frequencies of the other fans and compressors remain unchanged, so that the drying temperature is kept within the preset drying temperature operating range.

[0205] 704: Calculate the cross temperature difference between the second inlet and outlet air based on the temperature sensor readings at the inlet and outlet of the left and right air ducts.

[0206] The cross temperature difference between the second inlet and outlet air is calculated at specific time intervals, and it is determined whether the cross temperature difference is greater than or equal to the second preset temperature value T2. If the cross temperature difference is greater than or equal to the second preset temperature value T2, it is determined that the later stage of drying has not been reached, and step 704 is continued for drying. If the cross temperature difference is less than the second preset temperature value T2, the next step 705 is executed.

[0207] 705: If the temperature difference between the second inlet and outlet air is less than the second preset temperature value, reduce the operating frequency of the variable frequency fan until the drying condition is met and the drying process ends.

[0208] When the temperature difference between the second inlet and outlet air is less than the second preset temperature value, the drying process is considered complete, and the operating frequency of the inverter fan is reduced. This not only saves energy but also reduces wear and tear on the clothes. Furthermore, the operating frequency of the compressor on the other side can be reduced, further decreasing energy consumption. Drying continues until the drying conditions are met, at which point the process ends.

[0209] The following is a specific example to illustrate... Figure 7 The control method of the dual-duct heat pump drying system shown in the figure will be explained.

[0210] This specific example illustrates the control of a dual-duct heat pump drying system in a washing machine. The dual-duct heat pump drying system consists of a first variable-frequency compressor, a second variable-frequency compressor, a fixed-frequency fan, and a combination of a variable-frequency fan and a variable-frequency compressor (i.e., a combination of a variable-frequency fan and a variable-frequency compressor paired with a fixed-frequency fan and a variable-frequency compressor). Temperature sensors are installed at the inlet and outlet of each of the left and right ducts. The specific steps include the following:

[0211] S1: Drying mode activated.

[0212] S2: Turn on both compressors and fans.

[0213] S3: Adjust the high-frequency operation of the variable frequency compressors and variable frequency fans on both sides.

[0214] S4: Enter drying and heating mode.

[0215] S5: Determine if the cross temperature difference of the inlet air is greater than T1; if yes, return to execute S4; if no, execute S6.

[0216] In step S5, the cross-temperature difference between the first inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the first preset temperature value T1 to determine whether the drying temperature has been reached. If the cross-temperature difference between the first inlet air temperatures is less than or equal to T1, step S6 is executed to confirm that the drying temperature has been reached. It should be noted that by adjusting the value of T1 in this step, the drying temperature can be determined to be reached when the cross-temperature difference between the first inlet air temperatures is less than T1.

[0217] S6: Determine that the drying temperature has been reached.

[0218] S7: Gradually reduce the frequency of the inverter compressor to maintain its drying temperature at the drying temperature.

[0219] S8: Enter internal circulation drying mode.

[0220] S9: Determine if the cross temperature difference of the inlet air is less than T2; if not, return to execute S8; if yes, execute S10.

[0221] S9 calculates the cross temperature difference between the second inlet and outlet air temperatures of the left and right channels of the dual-duct heat pump drying system, and compares it with the second preset temperature value T2 to determine whether the drying temperature has been reached and the later stage of drying has been reached.

[0222] If the cross temperature difference between the second air inlet and T2 is less than T2, execute S10 to determine that the drying stage has been reached.

[0223] S10: Adjust the frequency converter fan to operate at low frequency.

[0224] S11: Determine that the conditions for judgment have been met.

[0225] The drying conditions can be flexibly set by those skilled in the art. In this embodiment, no specific restrictions are imposed. For example, it can be set to determine that the drying conditions have been met after a certain period of time has elapsed since the drying temperature was reached.

[0226] S12: End drying mode.

[0227] The dual-duct heat pump drying system control method provided in this application accurately reflects the humidity and temperature status of the clothes inside the drying chamber by real-time monitoring and comparison of the temperature difference between the inlet and outlet air vents, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only achieves precise temperature control and airflow adjustment during the drying process, but also ensures accurate determination of the drying endpoint, avoiding over-drying or under-drying problems.

[0228] According to an embodiment of this application, a control method for a dual-duct heat pump drying system is provided. This method is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are respectively installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts include a left duct and a right duct respectively connected to the equipment. A first fan and a first heat pump assembly forming a first heat pump system with a first compressor are installed in the left duct. A second fan and a second heat pump assembly forming a second heat pump system with a second compressor are installed in the right duct. At least one of the first fan, the second fan, the first compressor, and the second compressor is a variable frequency drive. The method includes performing the following processing during the drying process:

[0229] The operating frequency of the variable frequency drive should be determined at least according to the first drying mode;

[0230] Based on the temperature sensor values ​​measured at the inlet and outlet of the left and right air ducts, determine whether to enter the next drying mode of the first drying mode, or based on the temperature sensor values ​​measured at the inlet and outlet of the left and right air ducts, determine whether to enter the first drying mode.

[0231] The drying process includes at least one of the following: a drying heating mode, an internal circulation drying mode, and a drying judgment mode, which are executed sequentially in time. The first drying mode can be any mode included in the drying process.

[0232] In one alternative implementation, the method for determining the operating frequency of the variable frequency device, at least according to the first drying mode, can be as follows:

[0233] When the first drying mode is a drying and heating mode, the operating frequency of at least one or all of the variable frequency drives is determined to be high frequency. Alternatively, the operating frequency of the variable frequency drives is determined based on the first drying mode and the arrangement of the variable frequency drives in the left and right air ducts.

[0234] The arrangement of the variable frequency drive (VFD) equipment in the left and right air ducts is equivalent to the combination of the compressor and fan in the dual-duct heat pump drying system shown in the previous embodiments. Different combinations of the compressor and fan indicate different arrangements of the VFD equipment in the left and right air ducts, and consequently, different operating frequencies of the VFD equipment.

[0235] In actual implementation, the operating frequency of the variable frequency drive (VFD) can be determined based on the first drying mode and the arrangement of the VFD in the left and right air ducts, as follows:

[0236] Method 1: When the arrangement is a variable frequency device including a first compressor, in the drying and heating mode, the operating frequency of the first compressor is determined to be high frequency, and in the internal circulation drying mode, the operating frequency of the first compressor is reduced to below high frequency or low frequency; it should be noted that the purpose of adjusting the frequency of the variable frequency device in the internal circulation drying mode is to keep the drying temperature near or within the set value.

[0237] And / or,

[0238] Method 2: When the arrangement is a variable frequency device including the first fan, in the drying and heating mode, the operating frequency of the first fan is determined to be high frequency, and in the drying and drying judgment mode, the operating frequency of the first fan is determined to be low frequency.

[0239] And / or,

[0240] Method 3: In the case where the variable frequency equipment is arranged to include at least one of the first compressor and the second compressor and includes one of the first fan and the second fan, in the drying and heating mode, the operating frequency of at least one of the at least one compressor and the fan is determined to be high frequency; in the internal circulation drying mode, the frequency of at least one of the at least one compressor is reduced to below high frequency; and in the drying and drying judgment mode, the operating frequency of at least one fan is determined to be low frequency.

[0241] The method for determining the operating frequency of a variable frequency device provided in this specific embodiment is flexible and diverse, and can even combine two or more methods to comprehensively determine the operating frequency of the variable frequency device, making the determined operating frequency more reliable.

[0242] In one optional embodiment, the arrangement of the variable frequency devices in the left and right air ducts may include, but is not limited to:

[0243] The first arrangement has only the first and second fans as variable frequency devices; the second arrangement has only the first compressor as a variable frequency device; the third arrangement has only the second fan not being a variable frequency device; and the fourth arrangement has only the first compressor and the second fan as variable frequency devices.

[0244] Based on the above arrangement, and according to the first drying mode and the arrangement of the variable frequency equipment in the left and right air ducts, the operating frequency of the variable frequency equipment can be determined as follows:

[0245] In the first arrangement: in the drying and heating mode, the operating frequency of the variable frequency drive is set to high frequency; in the drying and desiccation mode, the operating frequency of the variable frequency drive is set to low frequency; and / or,

[0246] In the second arrangement: in the drying and heating mode, the operating frequency of the variable frequency drive is set to high frequency; in the internal circulation drying mode, the operating frequency of the variable frequency drive is reduced to below high frequency; and in the drying and drying judgment mode, the operating frequency of the variable frequency drive is set to low frequency; and / or,

[0247] In the third arrangement: in the drying and heating mode, at least the first fan and the first compressor are determined to be high frequency; in the internal circulation drying mode, at least the operating frequency of the first fan and the first compressor is determined to be below high frequency; in the drying and drying judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0248] In the fourth arrangement: in the drying and heating mode, the operating frequency of the variable frequency drive is set to high frequency; in the internal circulation drying mode, the operating frequency of the first compressor is set to below high frequency or low frequency; in the drying and drying judgment mode, the operating frequency of the second fan is set to low frequency; and / or,

[0249] In any arrangement and in any of the drying heating mode, internal circulation drying mode, and drying judgment mode, all equipment except the variable frequency device shall operate at a fixed frequency.

[0250] In this optional embodiment, corresponding operating frequency determination rules for the variable frequency device are preset for each of the four specific arrangement methods, so as to quickly and accurately obtain the operating frequency of the variable frequency device.

[0251] In one optional embodiment, the method for determining whether to enter the next drying mode of the first drying mode based on the temperature sensor measurements installed at the inlet and outlet of the left and right air ducts can be as follows:

[0252] Based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts, the cross temperature difference between the first inlet and outlet air in the first drying mode is calculated. If the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, the next drying mode is entered.

[0253] The specific value of the first preset temperature can be flexibly set by those skilled in the art, and no specific restrictions are imposed on it in the embodiments of this application.

[0254] In one optional embodiment, the method for determining whether to enter the first drying mode based on the temperature sensor measurements installed at the inlet and outlet of the left and right air ducts can be as follows:

[0255] Based on the temperature sensor measurements at the inlet and outlet of the left and right air ducts, the cross temperature difference between the second inlet and outlet air inlet in the previous drying mode is calculated. If the cross temperature difference between the second inlet and outlet air inlet is less than the second preset temperature value, the system switches from the previous drying mode to the first drying mode.

[0256] The specific value of the second preset temperature can be flexibly set by those skilled in the art, and no specific restrictions are imposed on it in the embodiments of this application.

[0257] The dual-duct heat pump drying system control method provided in this application determines whether to enter the first drying mode or the next drying mode based on the temperature sensor measurements at the inlet and outlet of the left and right ducts during the drying process of the equipment equipped with the dual-duct heat pump drying system. The specific drying mode determined determines the operating frequency of the variable frequency device, and the determined operating frequency is more reliable and accurate.

[0258] According to an embodiment of this application, a control device for a dual-duct heat pump drying system is provided. This device is applied to equipment equipped with a dual-duct heat pump drying system. Temperature sensors are respectively installed at the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system. The left and right ducts include a left duct and a right duct respectively connected to the equipment. Each left and right duct is equipped with a fan and a heat pump assembly that forms a heat pump system with a compressor. (Refer to...) Figure 8 The control device for this dual-duct heat pump drying system includes the following functional modules:

[0259] The first determining module 801 is used to determine the working power of each compressor and fan according to the combination of compressor and fan in the dual-duct heat pump drying system after the drying mode of the equipment is turned on.

[0260] The first calculation module 802 is used to calculate the first cross temperature difference between the inlet and outlet air based on the temperature sensor measurements set at the inlet and outlet of the left and right air ducts after entering the drying and heating mode.

[0261] The first adjustment module 803 is used to adjust the working power of the variable frequency compressor and / or variable frequency fan according to the first preset rule when the cross temperature difference between the first inlet and outlet air temperatures is less than the first preset temperature value, and switch to the internal circulation drying mode.

[0262] The second calculation module 804 is used to calculate the second cross temperature difference between the inlet and outlet air based on the temperature sensor measurements set at the inlet and outlet of the left and right air ducts.

[0263] The second adjustment module 805 is used to adjust the working power of the variable frequency compressor and / or variable frequency fan according to the second preset rule when the cross temperature difference between the second inlet and outlet air temperatures is less than the second preset temperature value, until the drying condition is met and the drying ends.

[0264] Optionally, in one implementation of this embodiment, when the combination of compressor and fan in the dual-duct heat pump drying system is a combination of dual fixed-frequency compressors and dual variable-frequency fans, the first determining module is specifically used for:

[0265] After the drying mode of the equipment is turned on, the two variable frequency fans are adjusted to run at high frequency, and the two fixed frequency compressors are adjusted to run at a fixed frequency.

[0266] Optionally, in one implementation of this embodiment, the second adjustment module includes:

[0267] The first submodule is used to adjust the two variable frequency fans to run at low frequency and maintain the two fixed frequency compressors to run at a fixed frequency when the temperature difference between the second inlet and outlet air is less than the second preset temperature value, until the drying condition is met and the drying ends.

[0268] Optionally, in one implementation of this embodiment, when the compressor and fan combination in the dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor, and two fixed-frequency fans, the first determining module is specifically used for:

[0269] After the drying mode of the equipment is turned on, the variable frequency compressor is adjusted to run at high frequency, and the dual fixed frequency fans and the fixed frequency compressor are adjusted to run at a fixed frequency.

[0270] Optionally, in one implementation of this embodiment, the first adjustment module includes:

[0271] The second submodule is used to reduce the operating frequency of the variable frequency compressor when the temperature difference between the first inlet and outlet air is less than the first preset temperature value, maintain the dual fixed frequency fans and the fixed frequency compressor at a fixed frequency, and switch to the internal circulation drying mode.

[0272] Optionally, in one implementation of this embodiment, when the compressor and fan combination in the dual-duct heat pump drying system is a combination of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan, and a variable frequency fan, the first determining module is specifically used for:

[0273] After the drying mode of the equipment is turned on, the first variable frequency compressor and the variable frequency fan are adjusted to run at high frequency, and the second variable frequency compressor and the fixed frequency fan are adjusted to run at a fixed frequency.

[0274] Optionally, in one implementation of this embodiment, the first adjustment module includes:

[0275] The third submodule is used to reduce the operating frequency of the first variable frequency compressor and the variable frequency fan when the cross temperature difference between the first inlet and outlet air is less than the first preset temperature value, maintain the second variable frequency compressor and the fixed frequency fan at a fixed frequency, and switch to the internal circulation drying mode.

[0276] Optionally, in one implementation of this embodiment, when the compressor and fan in the dual-duct heat pump drying system are combined in the form of a fixed-frequency fan and a variable-frequency compressor, or a variable-frequency fan and a fixed-frequency compressor, the first determining module specifically:

[0277] After the drying mode of the equipment is turned on, the variable frequency compressor and variable frequency fan are adjusted to run at high frequency, and the fixed frequency fan and fixed frequency compressor are adjusted to run at a fixed frequency.

[0278] Optionally, in one implementation of this embodiment, the first adjustment module includes:

[0279] The fourth submodule is used to reduce the operating frequency of the variable frequency compressor and switch to the internal circulation drying mode when the temperature difference between the first inlet and outlet air is less than the first preset temperature value.

[0280] The second adjustment module is specifically used to: reduce the operating frequency of the variable frequency fan when the cross temperature difference between the second inlet and outlet air is less than the second preset temperature value, until the drying condition is met and the drying process ends.

[0281] The dual-duct heat pump drying system control device provided in this application fully considers the working characteristics and advantages of different compressor and fan combinations. By optimizing the cross-judgment algorithm for inlet and outlet air temperatures and the frequency adjustment strategy for variable frequency fans and compressors, it achieves precise control and dynamic optimization of the drying process. For different compressor / fan types in the left and right ducts, it can significantly improve the energy efficiency ratio and drying efficiency of the dual-duct heat pump drying system and reduce drying energy consumption, achieving a more balanced drying effect.

[0282] about Figure 8 For a more detailed description of the relevant operations, please refer to the description in the method embodiments above, which will not be repeated here.

[0283] One embodiment of the present invention also provides a product implementing various method embodiments of the present invention. This product can be a computer software product, or an electronic device or hardware product that has the computer software product installed or integrated. The electronic device has at least two sensing devices and an electrically controlled door switch device disposed on its outer surface. Preferably, the electronic device is a washing machine. The washing machine can execute the methods shown in any of the above method embodiments to control the dual-duct heat pump drying system. The washing machine can also be equipped with the dual-duct heat pump drying system control device shown in the above device embodiments to control the dual-duct heat pump drying system of the washing machine.

[0284] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0285] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0286] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0287] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0288] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0289] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0290] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0291] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A control method for a dual-duct heat pump drying system, characterized in that, The method is applied to a device provided with a double-air-duct heat pump drying system, the left and right air ducts of the double-air-duct heat pump drying system are respectively provided with temperature sensors at the inlets and outlets, the left and right air ducts include a left air duct and a right air duct respectively communicating with the device, and the left and right air ducts are respectively provided with a fan and a two-component assembly forming a heat pump system with a compressor; the method comprises: After the drying mode of the device is turned on, the working power of each compressor and fan is determined according to the combination mode of the compressor and fan in the double-air-duct heat pump drying system; After entering the drying and temperature rising mode, the first cross temperature difference between the inlet and outlet air is calculated according to the measurement value of the temperature sensor arranged at the inlet and outlet of the left and right air ducts; In the case that the first cross temperature difference between the inlet and outlet air is less than a first preset temperature value, the working power of the variable frequency compressor and / or variable frequency fan is adjusted according to a first preset rule, and the internal circulation drying mode is switched to; The second cross temperature difference between the inlet and outlet air is calculated according to the measurement value of the temperature sensor arranged at the inlet and outlet of the left and right air ducts; In the case that the second cross temperature difference between the inlet and outlet air is less than a second preset temperature value, the working power of the variable frequency compressor and / or variable frequency fan is adjusted according to a second preset rule until the drying is ended after the drying end condition is reached.

2. The method of claim 1, wherein, In the case that the combination mode of the compressor and fan in the double-air-duct heat pump drying system is a combination of double fixed frequency compressors and double variable frequency fans, after the drying mode of the device is turned on, the working power of each compressor and fan is determined according to the combination mode of the compressor and fan in the double-air-duct heat pump drying system, comprising: After the drying mode of the device is turned on, the two variable frequency fans are adjusted to run at high frequency, and the two fixed frequency compressors are adjusted to run at a fixed frequency.

3. The method of claim 2, wherein, In the case that the second cross temperature difference between the inlet and outlet air is less than a second preset temperature value, the working power of the variable frequency compressor and / or variable frequency fan is adjusted according to a second preset rule until the drying is ended after the drying end condition is reached. In the case that the second cross temperature difference between the inlet and outlet air is less than a second preset temperature value, the two variable frequency fans are adjusted to run at low frequency, and the two fixed frequency compressors are maintained to run at a fixed frequency until the drying is ended after the drying end condition is reached.

4. The method of claim 1, wherein, in the case that the combination mode of the compressor and fan in the double-air-duct heat pump drying system is a combination of a fixed frequency compressor, a variable frequency compressor, and double fixed frequency fans, after the drying mode of the device is turned on, the working power of each compressor and fan is determined according to the combination mode of the compressor and fan in the double-air-duct heat pump drying system, comprising: After the drying mode of the device is turned on, the variable frequency compressor is adjusted to run at high frequency, and the double fixed frequency fan and the fixed frequency compressor are adjusted to run at a fixed frequency.

5. The method of claim 4, wherein, In the case that the first cross temperature difference between the inlet and outlet air is less than a first preset temperature value, the working power of the variable frequency compressor and / or variable frequency fan is adjusted according to a first preset rule, and the internal circulation drying mode is switched to; In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode.

6. The method of claim 1, wherein, In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode. In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode.

7. The method of claim 6, wherein, In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode. In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode.

8. The method of claim 1, wherein, In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode. In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode.

9. The method of claim 8, wherein, In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode. In the case that the first cross temperature difference between the first inlet air temperature and the first outlet air temperature is less than a first preset temperature value, the working frequency of the variable frequency compressor is adjusted, the double fixed frequency fan and the fixed frequency compressor are maintained to run at a fixed frequency, and the system is switched to the internal circulation drying mode. The device is applied to an equipment provided with a double air duct heat pump drying system, the inlets and outlets of the left and right air ducts of the double air duct heat pump drying system are respectively provided with temperature sensors; the device comprises: A first determination module is configured to determine the working power of each compressor and fan according to the combination mode of the compressor and fan in the double air duct heat pump drying system after the drying mode of the equipment is started.

10. A dual-duct heat pump drying system control device, characterized by, A first determination module is configured to determine the working power of each compressor and fan according to the combination mode of the compressor and fan in the double air duct heat pump drying system after the drying mode of the equipment is started. ​ The first computing module is configured to calculate a first cross temperature difference between inlet and outlet air temperatures according to temperature sensor measurement values of the left and right air duct inlets and outlets after entering the drying temperature rising mode; The first adjusting module is configured to adjust the working power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switch to the internal circulation drying mode if the first cross temperature difference between inlet and outlet air temperatures is less than a first preset temperature value. The second computing module is configured to calculate a second cross temperature difference between inlet and outlet air temperatures according to temperature sensor measurement values of the left and right air duct inlets and outlets. The second adjusting module is configured to adjust the working power of the variable frequency compressor and / or the variable frequency fan according to a second preset rule until the drying ends after reaching the drying judgment condition if the second cross temperature difference between inlet and outlet air temperatures is less than a second preset temperature value.

11. A method of controlling a dual-duct heat pump drying system, the method comprising: The method is applied to a device provided with a double air duct heat pump drying system, wherein the inlets and outlets of the left and right air ducts of the double air duct heat pump drying system are respectively provided with temperature sensors, the left and right air ducts include a left air duct and a right air duct respectively communicating with the device, the left air duct is provided with a first air fan and a first two-component assembly forming a first heat pump system with a first compressor, the right air duct is provided with a second air fan and a second two-component assembly forming a second heat pump system with a second compressor, and at least one of the first air fan, the second air fan, the first compressor and the second compressor is a variable frequency device; the method includes the following processing during the drying process: determining the working frequency of the variable frequency device according to at least the first drying mode; determining whether to enter the next drying mode of the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets, or determining whether to enter the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets; The drying process includes at least one of the drying temperature rising mode, the internal circulation drying mode and the drying judgment mode executed in time sequence; The determination of whether to enter the next drying mode of the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets includes: calculating the first cross temperature difference between inlet and outlet air temperatures in the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets, if the first cross temperature difference between inlet and outlet air temperatures is less than a first preset temperature value, entering the next drying mode; The determination of whether to enter the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets includes: calculating the second cross temperature difference between inlet and outlet air temperatures in the previous drying mode of the first drying mode according to temperature sensor measurement values of the left and right air duct inlets and outlets; if the second cross temperature difference between inlet and outlet air temperatures is less than a second preset temperature value, entering the first drying mode from the previous drying mode; wherein, if the first drying mode is the drying temperature rising mode, the working frequency of at least one or all of the variable frequency devices is determined as high frequency.

12. The method of claim 11, wherein, The at least determining the working frequency of the variable frequency device according to the first drying mode comprises: According to the first drying mode and the arrangement of the variable frequency device in the left and right air ducts, the working frequency of the variable frequency device is determined.

13. The method of claim 12, wherein, The determining the working frequency of the variable frequency device according to the first drying mode and the arrangement of the variable frequency device in the left and right air ducts comprises: In the case of the arrangement being that the variable frequency device comprises the first compressor, in the drying temperature rising mode, the working frequency of the first compressor is determined as high frequency, and in the internal circulation drying mode, the working frequency of the first compressor is reduced to be below high frequency or low frequency; and / or, In the case of the arrangement being that the variable frequency device comprises the first fan, in the drying temperature rising mode, the working frequency of the first fan is determined as high frequency, and in the drying termination drying mode, the working frequency of the first fan is determined as low frequency; and / or, In the case of the arrangement being that the variable frequency device comprises at least one compressor of the first compressor and the second compressor and comprises one fan of the first fan and the second fan, in the drying temperature rising mode, the working frequency of at least one of the at least one compressor and the one fan is determined as high frequency, in the internal circulation drying mode, the frequency of the at least one of the at least one compressor is reduced to be below high frequency, and in the drying termination drying mode, the working frequency of the one fan is determined as low frequency.

14. The method of claim 13, wherein, The arrangement comprises: Only the first fan and the second fan are a first arrangement of the variable frequency device; Only the first compressor is a second arrangement of the variable frequency device; Only the second fan is not a third arrangement of the variable frequency device; Only the first compressor and the second fan are a fourth arrangement of the variable frequency device.

15. The method of claim 14, wherein, The determining the working frequency of the variable frequency device according to the first drying mode and the arrangement of the variable frequency device in the left and right air ducts comprises: In the case of the first arrangement: in the drying temperature rising mode, the working frequency of the variable frequency device is determined as high frequency, and in the drying termination drying mode, the working frequency of the variable frequency device is determined as low frequency; and / or, In the case of the second arrangement: in the drying temperature rising mode, the working frequency of the variable frequency device is determined as high frequency, in the internal circulation drying mode, the working frequency of the variable frequency device is reduced to be below high frequency, and in the drying termination drying mode, the working frequency of the variable frequency device is determined as low frequency; and / or, In the case of the third arrangement: in the drying temperature rising mode, at least the first fan and the first compressor are determined as high frequency, in the internal circulation drying mode, at least the working frequency of the first fan and the first compressor is determined as below high frequency, and in the drying termination drying mode, the working frequency of the variable frequency device is determined as low frequency; and / or, In the case of the fourth arrangement: in the drying temperature rising mode, at least the first compressor and the second fan are determined as high frequency, in the internal circulation drying mode, at least the working frequency of the first compressor and the second fan is reduced to be below high frequency, and in the drying termination drying mode, the working frequency of the variable frequency device is determined as low frequency. In the case of the fourth arrangement: in the drying temperature rising mode, the working frequency of the variable frequency device is determined as high frequency, in the internal circulation drying mode, the working frequency of the first compressor is determined as below high frequency or low frequency, in the drying judgment drying mode, the working frequency of the second fan is determined as low frequency; and / or, In any arrangement and any of the drying temperature rising mode, the internal circulation drying mode and the drying judgment drying mode, the devices other than the variable frequency device are kept running at a fixed frequency.

16. A laundry machine characterized by The washing machine is provided with a double air duct heat pump drying system, the left and right air ducts of the double air duct heat pump drying system are respectively provided with temperature sensors at the inlets and outlets, the left and right air ducts include left and right air ducts respectively communicating with the devices, and the left and right air ducts are respectively provided with fans and two-component assemblies forming a heat pump system with the compressors; the washing machine adopts the method of any one of claims 1-9 or 11-15, or is controlled by the double air duct heat pump drying system control device of claim 10.

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