Double-air-duct heat pump drying system control method and device and washing machine

Abstract

The invention relates to a double-air-duct heat pump drying system control method and device and a washing machine, and the method comprises the steps: after an equipment drying mode is started, determining the working power of each compressor and fan according to the combination mode of the compressors and the fan in a double-air-duct heat pump drying system; a first inlet and outlet air temperature cross temperature difference of the double air ducts is calculated, and under the condition that the first inlet and outlet air temperature cross temperature difference is smaller than a first preset temperature value, the working power of a variable-frequency compressor and / or a variable-frequency fan is adjusted according to a first preset rule; and calculating a second inlet and outlet air temperature cross temperature difference of the double air ducts, and when the second inlet and outlet air temperature cross temperature difference is smaller than a second preset temperature value, adjusting the working power of the variable-frequency compressor and / or the variable-frequency fan according to a second preset rule until the drying judgment condition is met, and then finishing drying. By adopting the method, the humidity and temperature states of the clothes in the drying cavity can be accurately determined, so that the operation frequency of the variable-frequency fan and / or the compressor can be intelligently adjusted, and energy can be saved as much as possible on the premise of ensuring the drying efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a control method and device for a dual-duct heat pump drying system and a washing machine. Background Art

[0002] In the field of heat pump drying technology, as consumers' requirements for drying efficiency and energy-saving performance continue to increase, the traditional single-duct drying system can no longer meet market demand. Therefore, the dual-duct heat pump drying system, with its independent dual heat source and duct design, has become an important development direction for improving drying efficiency and energy saving. This allows the left and right ducts to be independently or collaboratively controlled according to their respective load characteristics, further improving the flexibility and adaptability of the system.

[0003] In the dual-duct heat pump drying system, the selection of compressors and fans has a direct impact on the drying effect and energy consumption. There are many compressor and fan combination solutions on the market, such as dual fixed-frequency compressors with dual variable-frequency fans, one-side fixed-frequency compressors and one-side variable-frequency compressors with dual fixed-frequency fans, and mixed combinations of variable-frequency and fixed-frequency fans and compressors, all of which show different drying strategies and energy consumption characteristics. These solutions combine the flexible adjustment of variable-frequency technology with the stable output of fixed-frequency technology to achieve the optimal match of temperature, air volume and energy consumption during the drying process.

[0004] However, although the above scheme has achieved certain results in improving drying efficiency and energy saving, the specific control strategy and optimization method for the dual-duct heat pump drying system still needs in-depth research and innovation. In particular, how to formulate a more refined and intelligent drying control algorithm based on the characteristics of different compressor and fan combinations to achieve more efficient energy utilization and better drying performance is an important direction of current technological development. Summary of the invention

[0005] In order to overcome the problems existing in the related art, a first aspect of an embodiment of the present invention proposes a dual-duct heat pump drying system control method, which is applied to a device provided with a dual-duct heat pump drying system, wherein the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, and the left and right ducts include a left duct and a right duct respectively connected to the device, and the left and right ducts are respectively provided with a fan and two-device components forming a heat pump system with a compressor; the method comprises:

[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 mode of the compressor and fan in the dual-duct heat pump drying system;

[0007] After entering the drying and heating mode, the first inlet and outlet air temperature crossover temperature difference is calculated according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts;

[0008] When the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, adjusting the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule, and switching to the internal circulation drying mode;

[0009] Calculate the second inlet and outlet air temperature crossover temperature difference based on the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts;

[0010] When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the operating power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the second preset rule until the drying condition is met and the drying is completed.

[0011] Optionally, when the combination of the compressor and the fan 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 device is turned on, the step of determining the working power of each compressor and fan according to the combination of the compressor and the fan 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 fixed frequency.

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

[0014] When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, the two variable frequency fans are adjusted to operate at a low frequency, and the two fixed frequency compressors are maintained to operate at a fixed frequency until the drying condition is met and the drying is completed.

[0015] Optionally, when the combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor and a dual-fixed-frequency fan, after the drying mode of the device is turned on, the step of determining the working power of each compressor and the fan according to the combination of the compressor and the fan 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 operate at a high frequency, and the dual fixed frequency fans and the fixed frequency compressor are adjusted to operate at a fixed frequency.

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

[0018] When the first inlet and outlet air temperature cross-temperature difference is less than the first preset temperature value, the operating frequency of the variable frequency compressor is lowered, the dual fixed frequency fans and the fixed frequency compressor are maintained to operate at a fixed frequency, and the mode is switched to the internal circulation drying mode.

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

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

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

[0022] When the first inlet and outlet air temperature cross-temperature difference is less than the first preset temperature value, the operating frequencies of the first variable frequency compressor and the variable frequency fan are lowered, the second variable frequency compressor and the fixed frequency fan are maintained to operate at a fixed frequency, and the mode is switched to the internal circulation drying mode.

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

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

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

[0026] When the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, lowering the operating frequency of the variable frequency compressor and switching to an internal circulation drying mode;

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

[0028] When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the operating frequency of the variable frequency fan is lowered until the drying is completed after the drying condition is met.

[0029] A second aspect of an embodiment of the present invention provides a dual-duct heat pump drying system control device, which is applied to a device provided with a dual-duct heat pump drying system, wherein the inlet and outlet of each of the left and right ducts of the dual-duct heat pump drying system are respectively provided with a temperature sensor, and the left and right ducts include a left duct and a right duct respectively connected to the device, and each of the left and right ducts is provided with a fan and two-device components that form a heat pump system with a compressor; the device comprises:

[0030] A first determination module is used to determine the working power of each compressor and fan according to the combination mode of the compressor and the fan in the dual-duct heat pump drying system after the drying mode of the device is turned on;

[0031] A first calculation module is used to calculate a first inlet and outlet air temperature crossover temperature difference according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right air ducts after entering the drying and heating mode;

[0032] A first adjustment module, configured to adjust the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switch to an internal circulation drying mode when the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value;

[0033] A second calculation module is used to calculate the second inlet and outlet air temperature cross temperature difference according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets 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 the variable frequency fan according to the second preset rule when the second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value, until the drying is completed after the drying condition is met.

[0035] A third aspect of an embodiment of the present invention provides a control method for a dual-duct heat pump drying system, wherein the method is applied to a device provided with a dual-duct heat pump drying system, wherein the inlet and outlet of each of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, the left and right ducts include a left duct and a right duct respectively connected to the device, the left duct is provided with a first fan and a first two-device component forming a first heat pump system with a first compressor, the right duct is provided with a second fan and a second two-device component forming a second heat pump system with a second compressor, and at least one of the first fan, the second fan, the first compressor and the second compressor is a variable frequency device; the method includes performing the following processing during the drying process:

[0036] Determining the operating frequency of the variable frequency device at least according to the first drying mode;

[0037] Determine whether to enter the next drying mode of the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts, or,

[0038] Determining whether to enter the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts;

[0039] The drying process includes at least one of a drying temperature rise mode, an internal circulation drying mode and a drying dryness determination mode which are executed in chronological order.

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

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

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

[0043] The operating frequency of the variable frequency device is determined according to 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 according to 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 mode, the operating frequency of the first compressor is determined to be high frequency in the drying and heating mode, and the operating frequency of the first compressor is reduced to below high frequency or to low frequency in the internal circulation drying mode; and / or,

[0046] In the case where the arrangement is that the variable frequency device includes the first fan, in the drying temperature rise mode, the operating frequency of the first fan is determined to be high frequency, and in the drying dryness determination mode, the operating frequency of the first fan is determined to be low frequency; and / or,

[0047] In the case where the arrangement is that the variable frequency device includes 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 one 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 the high frequency, and in the drying judgment 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 in the first arrangement of the variable frequency devices;

[0050] A second arrangement in which only the first compressor is the variable frequency device;

[0051] A third arrangement in which only the second fan is not the variable frequency device;

[0052] In the fourth arrangement, only the first compressor and the second fan are the variable frequency devices.

[0053] Optionally, determining the operating 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 includes:

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

[0055] In the case of the second 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 variable frequency device is reduced to below high frequency, and in the drying dryness judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0056] In the case of 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 frequencies of the first fan and the first compressor are determined to be below high frequency, and in the drying judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0057] In the case of 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, and in the drying judgment mode, the operating frequency of the second fan is determined to be low frequency; and / or,

[0058] In any arrangement and any mode among the drying temperature rising mode, the internal circulation drying mode and the drying determination mode, the devices other than the variable frequency device are kept running at a fixed frequency.

[0059] Optionally, determining whether to enter a next drying mode of the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts includes:

[0060] According to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts, the first inlet and outlet air temperature crossover temperature difference under the first drying mode is calculated,

[0061] If the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, entering the next drying mode;

[0062] The determining whether to enter the first drying mode according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right air ducts includes:

[0063] Calculate the second inlet and outlet air temperature crossover temperature difference in the drying mode before the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts;

[0064] If the second inlet and outlet air temperature crossover temperature difference is less than a second preset temperature value, the first drying mode is entered from the previous drying mode.

[0065] A fourth aspect of an embodiment of the present invention proposes a washing machine, which is provided with a dual-duct heat pump drying system, and the inlet and outlet of the left and right air ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors; the washing machine adopts any one of the methods described in 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 the present invention is applied to a device provided with a dual-duct heat pump drying system, and the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors. The left and right ducts form an air circulation passage with the inside of the device (for example, the clothes processing drum of the washing machine) through their respective inlets and outlets. 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 the fan in the dual-duct heat pump drying system; after entering the drying temperature rise mode, the first inlet and outlet temperature cross temperature difference is calculated according to the measurement values ​​of the temperature sensors set at the inlet and outlet of the left and right ducts; when the first inlet and outlet temperature cross temperature difference is less than the first preset temperature value, the working power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the first preset rule, and the mode is switched to the internal circulation drying mode; the second inlet and outlet temperature cross temperature difference is calculated according to the measurement values ​​of the temperature sensors set at the inlet and outlet of the left and right ducts; when the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the working power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the second preset rule until the drying condition is met and the drying ends. The technical solution of the present invention can accurately reflect the humidity and temperature status of the clothes in the drying chamber by real-time monitoring and comparing the temperature difference between the inlet and outlet, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor, and achieving energy saving as much as possible while ensuring the drying efficiency.

[0067] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The accompanying drawings, which are incorporated in and constitute a 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 is a flow chart of a control method of a dual-air duct heat pump drying system according to an exemplary embodiment;

[0070] Figure 2 is a schematic structural diagram of a double-air duct heat pump drying system according to an exemplary embodiment;

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

[0072] Figure 4 is a flow chart of a control method of a dual-air duct heat pump drying system according to an exemplary embodiment;

[0073] Figure 5 is a flow chart of a control method of a dual-air duct heat pump drying system according to an exemplary embodiment;

[0074] Figure 6 is a flow chart of a control method of a dual-air duct heat pump drying system according to an exemplary embodiment;

[0075] Figure 7 is a flow chart of a control method of a dual-air duct heat pump drying system according to an exemplary embodiment;

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

[0077] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0079] The present invention proposes a new control method for a dual-duct heat pump drying system. The method fully considers the working characteristics and advantages of different compressor and fan combinations, and realizes precise control and dynamic optimization of the drying process by optimizing the inlet and outlet air temperature cross judgment algorithm and the variable frequency fan and compressor frequency adjustment strategy. The implementation of this technology will significantly improve the energy efficiency ratio and drying efficiency of the dual-duct heat pump drying system, and achieve a more efficient, energy-saving and intelligent drying effect, while promoting the further development and innovation of heat pump drying technology. The following is a detailed description with reference to specific embodiments.

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

[0081] 101: 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 the compressor and the fan in the dual-duct heat pump drying system.

[0082] The dual-duct heat pump drying system control provided in the embodiment of the present application is applied to a device provided with a dual-duct heat pump drying system, and the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors. The left and right ducts respectively form an air circulation passage with the inside of the device (for example, the clothes processing drum of a washing machine) through their respective inlets and outlets. It should be noted that the device can be any appropriate device such as a washing machine, a dryer, etc.

[0083] The combination of the compressor and the fan of the dual-duct heat pump drying system may include, but is not limited to: dual fixed-frequency compressors with dual variable-frequency fans, one side of the fixed-frequency compressor and one side of the variable-frequency compressor with dual fixed-frequency fans, a group of variable-frequency fans and variable-frequency compressors with a group of fixed-frequency fans and variable-frequency compressors, a group of fixed-frequency fans and variable-frequency compressors with a group of variable-frequency fans and fixed-frequency compressors, and other mixed combinations. Regardless of the combination, the inlet and outlet of the left and right ducts are respectively provided with temperature sensors, which can also be called temperature sensing bags. The structure of the temperature sensing bag is respectively provided for the inlet and outlet of the left and right ducts, which can measure and record the inlet and outlet temperatures in real time, so that the operating system of the equipment can calculate the inlet and outlet cross temperature difference according to the inlet and outlet temperatures, and efficiently and accurately control the operating frequency of the compressor and / or fan according to the inlet and outlet cross temperature difference. It should be noted that the above is only an exemplary list of four combinations of compressors and fans. In the actual implementation process, those skilled in the art can flexibly set the combination of compressors and fans in the dual-duct heat pump drying system according to actual needs.

[0084] After the drying mode of the equipment is turned on, the compressor and fan start-up need to be combined with the combination of the compressor and the fan after startup to flexibly adjust the working power of the compressor and the fan. The combination of the compressor and the fan in the dual-duct heat pump drying system is different, and the adjustment rules for the working power of the compressor and the fan are also different. The operating system of the equipment has preset adjustment rules corresponding to various combinations, so after determining the combination, the adjustment rules for the working frequency of the compressor and the fan can be determined. The operating system can preset the working frequency values ​​of the high, medium, and low frequency gears corresponding to the compressor and the fan respectively. When adjustment is required later, the gear to be adjusted is determined and the compressor or fan is adjusted to the working frequency of the gear to be adjusted.

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

[0086] An exemplary dual-duct heat pump drying system structure diagram is shown in FIG. Figure 2 The dual-duct heat pump drying system is a dual-fixed-frequency compressor with a dual-variable-frequency fan. Figure 2 It can be seen that the inlet and outlet of the left and right air ducts are respectively provided with temperature sensors (specifically including two air outlet temperature sensing packages and two air inlet temperature sensing packages). The dual-duct heat pump drying system with a fixed-frequency compressor on one side and a variable-frequency compressor on the other side and dual fixed-frequency fans is similar to it.

[0087] Another exemplary dual-duct heat pump drying system structure diagram is shown in FIG. Figure 3 The dual-duct heat pump drying system is a set of variable frequency fans and variable frequency compressors with a set of fixed frequency fans and variable frequency compressors. Figure 3 It can be seen that the inlet and outlet of the left and right air ducts are also equipped with temperature sensors (including two outlet temperature sensing packages and two inlet temperature sensing packages). A dual-duct heat pump drying system with a set of fixed-frequency fan variable-frequency compressor and a set of variable-frequency fan fixed-frequency compressor is similar to it.

[0088] It should be noted that the number of temperature sensors installed at the air outlet and air inlet of the left and right channels of the dual-duct heat pump drying system is not limited to one, and 2 or 3 temperature sensors can be installed at each outlet, and even the number of temperature sensors installed at each outlet can be different, so as to ensure that the temperature of the air duct inlet and outlet is actually collected.

[0089] The structure provided in this optional embodiment of arranging 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 first inlet and outlet air temperature crossover temperature difference is calculated based on the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts.

[0091] The temperature sensors set at the inlet and outlet of the two channels can detect the temperature value, and the signals fed back by the temperature sensors are all electrical signals. An operating system is set in the settings, and the electrical signals uploaded by each temperature sensor of the operating system are analyzed to obtain the temperature value based on the electrical signals uploaded by each temperature sensor. The temperature values ​​of the two inlets and two outlets are calculated according to the preset calculation rules to obtain the first inlet and outlet temperature cross temperature difference.

[0092] An exemplary method of calculating the first inlet and outlet air temperature cross temperature difference through four sensor temperature values ​​may be:

[0093] 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 are calculated, and the average value of the two temperature differences is determined as the first inlet and outlet air temperature crossover temperature difference.

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

[0095] When the first inlet and outlet temperature cross temperature difference is less than the first preset temperature value, it is determined that the drying temperature is reached and the mode is switched to the internal circulation drying mode. Step 102 is executed repeatedly, and it is determined whether the first inlet and outlet temperature cross temperature difference is less than the first preset temperature value, until the first inlet and outlet temperature cross temperature difference is less than the first preset temperature value, step 103 is executed.

[0096] The first preset temperature value may be expressed as T1. The first preset temperature value may be flexibly set by those skilled in the art, and is not specifically limited in the embodiments of the present application.

[0097] Different combinations of compressors and fans in the dual-duct heat pump drying system result in different first rules for adjusting the working power of the compressors and fans. The operating system of the device has preset first preset rules corresponding to various combinations, so after determining the combination, the first preset rules for the working frequencies of the compressors and fans can be determined, and the working power of the variable frequency compressor and / or variable frequency fan can be adjusted according to the determined first preset rules.

[0098] By adjusting the working power of the variable frequency compressor and / or the variable frequency fan according to the first preset rule, the drying temperature of the dual-duct heat pump drying system can be maintained within a specific drying temperature range without affecting the drying efficiency.

[0099] 104: Calculate a second inlet and outlet air temperature crossover temperature difference based on the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts.

[0100] The second inlet and outlet air temperature cross temperature difference can be calculated in the same manner as the first inlet and outlet air temperature cross temperature difference, which will not be described in detail here.

[0101] After calculating the second inlet and outlet temperature cross temperature difference, determine whether it is less than the second preset temperature value; if it is less than, it is determined that the drying end 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 on drying items such as clothes. If it is not less than the second preset temperature value, repeat step 104 until the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, and execute step 105. The second preset temperature value can be expressed as T2, and the second preset temperature value can be flexibly set by those skilled in the art, and there is no specific limitation on this in the embodiments of the present application.

[0102] 105: When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, adjust the operating power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule until the drying condition is met and the drying is completed.

[0103] Different combinations of compressors and fans in the dual-duct heat pump drying system result in different second rules for adjusting the working power of the compressors and fans. The operating system of the device has preset second preset rules corresponding to various combinations, so after determining the combination, the second preset rules for the working frequencies of the compressors and fans can be determined, and the working power of the variable frequency compressor and / or variable frequency fan can be adjusted according to the determined second preset rules.

[0104] The control method of the dual-duct heat pump drying system provided by the embodiment of the present application, after the drying mode of the equipment is turned on, according to the combination mode of the compressor and the fan in the dual-duct heat pump drying system, the working power of each compressor and the fan is determined; after entering the drying temperature rise mode, according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right ducts, the first inlet and outlet temperature cross temperature difference is calculated; when the first inlet and outlet temperature cross temperature difference is less than the first preset temperature value, the working power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the first preset rule, and the internal circulation drying mode is switched; according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right ducts, the second inlet and outlet temperature cross temperature difference is calculated; when the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the working power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the second preset rule until the drying is completed after the dry condition is met. The technical solution of the present invention can accurately reflect the humidity and temperature state of the clothes in the drying chamber by real-time monitoring and comparing the temperature difference of the inlet and outlet, so as to intelligently adjust the operating frequency of the variable frequency fan and / or the compressor, and achieve energy saving as much as possible under the premise of ensuring the drying efficiency.

[0105] According to an embodiment of the present application, a dual-duct heat pump drying system control method is provided, referring to Figure 4 , the method comprising:

[0106] 401: 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 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, and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. The combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a dual fixed-frequency compressor and a dual variable-frequency fan. In the embodiment of this application, the device is a washing machine as an example for explanation. The schematic diagram of the dual-duct heat pump drying system composed of a dual fixed-frequency compressor and a dual variable-frequency fan is shown in FIG. Figure 2 shown.

[0108] The washing machine's drying mode is turned on, and the dual fixed-frequency compressors are paired with dual variable-frequency fans. The variable-frequency fans on both sides are adjusted to run at a high frequency to enter the drying and heating mode to dry and heat the washing machine drum.

[0109] 402: After entering the drying and heating mode, the first inlet and outlet air temperature crossover temperature difference is calculated based on the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts.

[0110] Execute step 402 to dry and heat the inner drum of the washing machine, and calculate the first inlet and outlet air temperature crossover temperature difference at a specific time interval, and determine whether the first inlet and outlet air temperature crossover temperature difference is greater than or equal to a first preset temperature value T1;

[0111] If the first inlet and outlet temperature 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 402 is continued to perform drying and heating. Otherwise, the next step 403 is performed.

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

[0113] After reaching the drying temperature, there is no need to adjust the working power of the variable frequency compressor and / or variable frequency fan in this step, and directly switch to the internal circulation drying mode.

[0114] 404: Calculate a second inlet and outlet air temperature crossover temperature difference based on the measurement values ​​of the temperature sensors disposed at the inlets and outlets of the left and right air ducts.

[0115] The second inlet and outlet air temperature cross temperature difference is calculated at a specific time interval, and it is determined whether the second inlet and outlet air temperature cross temperature difference is greater than or equal to the second preset temperature value T2; if the second inlet and outlet air temperature 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 second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value T2, the next step is executed.

[0116] 405: When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, the two variable frequency fans are adjusted to operate at a low frequency (for example, lower than the set frequency), and the two fixed frequency compressors are maintained to operate at a fixed frequency until the drying condition is met and the drying is completed.

[0117] When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value T2, it is determined that the dry temperature is reached, and the variable frequency fans on both sides are adjusted to run at a low frequency to save energy and reduce wear on the clothes. After the dry condition is reached, the drying is ended, and the control of the dual-duct heat pump drying system in this drying process is completed. The dry condition can be flexibly set by those skilled in the art, and there is no specific limitation on this in the embodiment of the present application. For example, it is set to continue drying for a specific time after reaching the dry temperature to determine that the dry condition is reached.

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

[0119] In this specific example, the control of the dual-duct heat pump drying system in the washing machine is used as an example for explanation. The dual-duct heat pump drying system is a combination of dual fixed-frequency compressors and dual variable-frequency fans, and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. Specifically, the following steps are included:

[0120] S1: Drying mode is on.

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

[0122] S3: Enter the drying and heating mode.

[0123] S4: Determine whether the cross temperature difference of the inlet air temperature is greater than T1; if so, return to execute S3; if not, execute S5.

[0124] In S4, the first inlet and outlet temperature cross temperature difference 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 is reached. When the first inlet temperature cross temperature difference is less than or equal to T1, S5 is executed to determine that the drying temperature is reached. It should be noted that by adjusting the value of T1 in this step, it can be converted to when the first inlet temperature cross temperature difference is less than T1, it is determined that the drying temperature is reached.

[0125] S5: Determine whether the drying temperature is reached.

[0126] S6: Enter the internal circulation drying mode.

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

[0128] In S7, the second inlet and outlet air temperature crossover temperature difference of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the second preset temperature value T2 to determine whether the drying temperature is reached.

[0129] The second inlet air temperature cross temperature difference is less than T2, and S8 is executed to determine that the dryness determination temperature has been reached.

[0130] S8: Determine whether the determination condition is met.

[0131] The dryness judgment condition can be flexibly set by those skilled in the art, and no specific limitation is imposed on this in the embodiments of the present application. For example, it is set to determine that the dryness judgment condition is met when the dryness judgment temperature is reached; or it is set to determine that the dryness judgment condition is met after a specific period of time when the dryness judgment temperature is reached.

[0132] S9: End the drying mode.

[0133] In the embodiment of the present application, temperature sensors are installed at the air inlet and outlet of the air ducts on both sides of the dual-duct heat pump drying system, and the inlet and outlet temperatures are measured and recorded in real time, the temperature difference is monitored, and efficient energy utilization and precise process control are achieved according to the cross temperature difference between the inlet and outlet. By comparing the temperature difference between the inlet and outlet (i.e., the inlet and outlet temperatures), the operating state of the system is judged, and the working parameters of related equipment (such as compressors and fans) and the drying control process are adjusted accordingly. Temperature sensors are installed at the inlet and outlet of the drying, cooling or heat exchange system, and the inlet and outlet temperatures are measured and recorded in real time. Not only that, the temperature difference is judged based on the cross temperature of the inlet and outlet temperatures, and the frequency method of the variable frequency fan and / or compressor is controlled. 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 air ducts to achieve precise temperature and humidity control. To achieve the expected drying and dryness determination purposes.

[0134] According to an embodiment of the present application, a dual-duct heat pump drying system control method is provided, referring to Figure 5 , the method comprising:

[0135] 501: 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 fixed frequency compressor are adjusted to run at 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, and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. The combination of the compressor and the fan in the dual-duct heat pump drying system is a fixed-frequency compressor, a variable-frequency compressor, and a combination of dual fixed-frequency fans. In the embodiment of this application, the device is a washing machine for illustration. The schematic diagram of the dual-duct heat pump drying system composed of dual fixed-frequency compressors and dual variable-frequency fans is shown in FIG. Figure 2 shown.

[0137] The washing machine's drying mode is turned on, and the compressors and fans on both sides are turned on. The variable frequency compressor on one side is adjusted to run at a high frequency, and the dual fixed frequency fans and fixed frequency compressor are adjusted to run at a fixed frequency to enter the drying and heating mode to dry and heat the washing machine drum.

[0138] 502: After entering the drying and heating mode, the first inlet and outlet air temperature crossover temperature difference is calculated based on the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts.

[0139] Execute step 502 to dry and heat the inner drum of the washing machine, and calculate the first inlet and outlet air temperature crossover temperature difference at a specific time interval, and determine whether the first inlet and outlet air temperature crossover temperature difference is greater than or equal to a first preset temperature value T1;

[0140] If the first inlet and outlet temperature 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 502 is continued to perform drying and heating. Otherwise, the next step 503 is performed.

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

[0142] After reaching the drying temperature, the operating frequency of the variable frequency compressor is lowered in an orderly manner, and the operating frequencies of the dual fixed frequency fans and the fixed frequency compressor remain unchanged, so that the drying temperature is maintained within the preset drying temperature operating range.

[0143] 504: Calculate a second inlet and outlet air temperature crossover temperature difference according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts.

[0144] The second inlet and outlet air temperature cross temperature difference is calculated at a specific time interval, and it is determined whether the second inlet and outlet air temperature cross temperature difference is greater than or equal to the second preset temperature value T2; if the second inlet and outlet air temperature 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 second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value T2, the next step 505 is executed.

[0145] 505: When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, adjust the operating power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule until the drying condition is met and the drying is terminated.

[0146] The second preset rule can be set to keep the variable frequency compressor running at a low frequency, and the dual fixed frequency fans and the fixed frequency compressor running at the same frequency until the drying condition is met and the drying is completed. Since this drying state does not require much heat, the variable frequency compressor can run at a low frequency to meet the heat demand, which can save energy.

[0147] In the control method of the dual-duct heat pump drying system provided in the embodiment of the present application, temperature sensors are respectively installed at the air inlet and outlet of the air ducts on both sides of the dual-duct heat pump drying system, and the inlet and outlet temperatures are measured and recorded in real time, the temperature difference is monitored, and efficient energy utilization and precise process control are achieved according to the cross temperature difference between the inlet and outlet. By comparing the temperature difference between the inlet and outlet (i.e., the inlet temperature and the outlet temperature), the operating state of the system is judged, and the working parameters of the relevant equipment (such as the compressor, the fan) and the drying control process are adjusted accordingly. Temperature sensors are respectively installed at the inlet and outlet of the drying, cooling or heat exchange system, and the inlet and outlet temperatures are measured and recorded in real time. Not only that, the temperature difference is judged according to the cross temperature of the inlet and outlet, and the frequency method of the variable frequency fan and / or compressor is controlled. 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 air ducts to achieve precise temperature and humidity control. In order to achieve the expected drying and dryness judgment purposes.

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

[0149] In this specific example, the control of the dual-duct heat pump drying system in the washing machine is used as an example for explanation. The dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor and a dual-fixed-frequency fan (i.e., a fixed-frequency compressor on one side, a variable-frequency compressor on the other side and a dual-fixed-frequency fan combination), and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. Specifically, the following steps are included:

[0150] S1: Drying mode is on.

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

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

[0153] S4: Enter the drying and heating mode.

[0154] S5: Determine whether the inlet air temperature cross temperature difference is greater than T1; if so, return to execute S4; if not, execute S6.

[0155] In S5, the first inlet and outlet temperature cross temperature difference 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 is reached. When the first inlet temperature cross temperature difference is less than or equal to T1, S6 is executed to determine that the drying temperature is reached. It should be noted that by adjusting the value of T1 in this step, it can be converted to when the first inlet temperature cross temperature difference is less than T1, it is determined that the drying temperature is reached.

[0156] S6: Determine whether the drying temperature is reached.

[0157] S7: Orderly reduce the frequency of the variable frequency compressor to keep its drying temperature at the drying temperature.

[0158] S8: Enter the internal circulation drying mode.

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

[0160] In S9, the second inlet and outlet air temperature crossover temperature difference of the left and right channels of the dual-duct heat pump drying system is calculated, and compared with the second preset temperature value T2 to determine whether the drying temperature is reached.

[0161] The second inlet air temperature crossover temperature difference is less than T2, and S10 is executed to determine that the dryness determination temperature has been reached.

[0162] S10: Determine whether the dryness determination condition is met.

[0163] The dryness judgment condition can be flexibly set by those skilled in the art, and no specific limitation is imposed on this in the embodiments of the present application. For example, it is set to determine that the dryness judgment condition is met when the dryness judgment temperature is reached; or it is set to determine that the dryness judgment condition is met after a specific period of time when the dryness judgment temperature is reached.

[0164] S11: End the drying mode.

[0165] The dual-duct heat pump drying system control method provided in the embodiment of the present application can accurately reflect the humidity and temperature status of the clothes in the drying chamber by real-time monitoring and comparing the temperature difference between the inlet and outlet, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only realizes precise temperature control and air volume adjustment during the drying process, but also ensures accurate judgment of the drying endpoint, avoiding the problem of over-drying or under-drying.

[0166] According to an embodiment of the present application, a dual-duct heat pump drying system control method is provided, referring to Figure 6 , the method comprising:

[0167] 601: 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 variable frequency compressor and the fixed frequency fan on the other side are adjusted 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, and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. The combination of the compressor and the fan in the dual-duct heat pump drying system is a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan and a variable frequency fan combination (that is, a group of variable frequency fans and variable frequency compressors are matched with a group of fixed frequency fans and variable frequency compressors). In the embodiment of this application, the device is a washing machine for explanation. The schematic diagram of the dual-duct heat pump drying system structure of the washing machine in this example is shown as follows: Figure 3 shown.

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

[0170] 602: After entering the drying and heating mode, the first inlet and outlet air temperature cross temperature difference is calculated according to the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts.

[0171] Execute step 602 to dry and heat the inner drum of the washing machine, and calculate the first inlet and outlet air temperature cross temperature difference at a specific time interval, and determine whether the first inlet and outlet air temperature cross temperature difference is greater than or equal to the first preset temperature value T1; if the first inlet and outlet air temperature 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 then continue to step 602 to dry and heat. Otherwise, proceed to the next step 603.

[0172] 603: When the first inlet and outlet air temperature crossover temperature difference is less than the first preset temperature value, the working power of the first variable frequency compressor and the variable frequency fan is reduced, the second variable frequency compressor and the fixed frequency fan are maintained to operate at a fixed frequency, and the mode is switched to the internal circulation drying mode.

[0173] After reaching the drying temperature, the operating frequencies of the first variable frequency compressor and variable frequency fan are lowered in order, and the operating power of the second variable frequency compressor and fixed frequency fan remains unchanged, so that the drying temperature is maintained within the preset drying temperature operating range.

[0174] 604: Calculate a second inlet and outlet air temperature crossover temperature difference according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts.

[0175] The second inlet and outlet air temperature cross temperature difference is calculated at a specific time interval, and it is determined whether the second inlet and outlet air temperature cross temperature difference is greater than or equal to the second preset temperature value T2; if the second inlet and outlet air temperature 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 second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value T2, the next step 605 is executed.

[0176] 605: When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, adjust the operating power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule until the drying condition is met and the drying is terminated.

[0177] When the second inlet and outlet temperature crossover temperature difference is less than the second preset temperature value, it is determined that the drying late stage has been reached. The second preset rule can be set to further reduce the working power of the variable frequency fan and the first variable frequency compressor until the drying ends after the dryness judgment condition is met. Further reducing the working power of the variable frequency fan in the late drying stage can not only save energy but also reduce wear on clothes. 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. Figure 6 The control method of the dual-duct heat pump drying system shown in is explained.

[0179] In this specific example, the control of the dual-duct heat pump drying system in the washing machine is used as an example for explanation. The dual-duct heat pump drying system is composed of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan and a variable frequency fan combination (i.e., a set of variable frequency fan variable frequency compressors and a set of fixed frequency fan variable frequency compressors), and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. Specifically, the following steps are included:

[0180] S1: Drying mode is on.

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

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

[0183] S4: Enter the drying and heating mode.

[0184] S5: Determine whether the cross temperature difference of the inlet air temperature is greater than T1; if so, return to execute S4; if not, execute S6.

[0185] In S5, the first inlet and outlet temperature cross temperature difference 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 is reached. When the first inlet temperature cross temperature difference is less than or equal to T1, S6 is executed to determine that the drying temperature is reached. It should be noted that by adjusting the value of T1 in this step, it can be converted to when the first inlet temperature cross temperature difference is less than T1, it is determined that the drying temperature is reached.

[0186] S6: Determine whether the drying temperature is reached.

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

[0188] S8: Enter the internal circulation drying mode.

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

[0190] In S9, the second inlet and outlet air temperature crossover temperature difference of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the second preset temperature value T2 to determine whether the drying temperature is reached and the drying end stage is reached.

[0191] The second inlet air temperature crossover temperature difference is less than T2, and S10 is executed to determine that the drying temperature is reached, and the drying stage is reached.

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

[0193] S11: Determine whether the determination condition is met.

[0194] The dryness judgment condition can be flexibly set by those skilled in the art, and no specific limitation is imposed on this in the embodiments of the present application. For example, it is set to determine that the dryness judgment condition is met when the dryness judgment temperature is reached; or it is set to determine that the dryness judgment condition is met after a specific period of time when the dryness judgment temperature is reached.

[0195] S12: End the drying mode.

[0196] The dual-duct heat pump drying system control method provided in the embodiment of the present application can accurately reflect the humidity and temperature status of the clothes in the drying chamber by real-time monitoring and comparing the temperature difference between the inlet and outlet, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only realizes precise temperature control and air volume adjustment during the drying process, but also ensures accurate judgment of the drying endpoint, avoiding the problem of over-drying or under-drying.

[0197] According to an embodiment of the present application, a dual-duct heat pump drying system control method is provided, referring to Figure 7 , the method comprising:

[0198] 701: After the drying mode of the equipment is turned on, the variable frequency compressor and the variable frequency fan are adjusted to operate at a high frequency, and the fixed frequency fan and the fixed frequency compressor are adjusted to operate 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, and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. The combination of the compressor and the fan in the dual-duct heat pump drying system is a first variable frequency compressor, a second variable frequency compressor, a constant frequency fan and a variable frequency fan combination (i.e. a group of fixed frequency fan variable frequency compressors are matched with a group of variable frequency fan fixed frequency compressors). In the embodiment of this application, the device is a washing machine for illustration. The schematic diagram of the dual-duct heat pump drying system structure of the washing machine in this example is shown in FIG. Figure 3 shown.

[0200] The washing machine's drying mode is turned on, the 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, and the fixed frequency compressors and fixed frequency fans on both sides run at a fixed frequency to enter the drying and heating mode to dry and heat the washing machine drum.

[0201] 702: After entering the drying and heating mode, the first inlet and outlet temperature cross temperature difference is calculated according to the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts.

[0202] Execute step 702 to dry and heat the inner drum of the washing machine, and calculate the first inlet and outlet air temperature cross temperature difference at a specific time interval, and determine whether the first inlet and outlet air temperature cross temperature difference is greater than or equal to the first preset temperature value T1; if the first inlet and outlet air temperature 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 then continue to step 702 to dry and heat. Otherwise, proceed to the next step 703.

[0203] 703: When the first inlet and outlet air temperature cross temperature difference is less than the first preset temperature value, the operating frequency of the variable frequency compressor is lowered and the mode is switched to the internal circulation drying mode.

[0204] After reaching the drying temperature, the frequency of the variable frequency compressor on one side is reduced in an orderly manner, while the operating frequencies of other fans and compressors remain unchanged, so that the drying temperature is maintained within the preset drying temperature operating range.

[0205] 704: Calculate a second inlet and outlet air temperature crossover temperature difference according to the measurement values ​​of the temperature sensors disposed at the inlets and outlets of the left and right air ducts.

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

[0207] 705: When the second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value, the operating frequency of the variable frequency fan is lowered until the drying is completed after the drying condition is met.

[0208] When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, it is determined that the drying end stage has been reached, and the operating frequency of the variable frequency fan is reduced, which can not only save energy but also reduce the wear on the clothes. In addition, the operating frequency of the compressor on the other side can also be reduced to reduce energy consumption. Drying ends when the dryness judgment condition is met.

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

[0210] In this specific example, the control of the dual-duct heat pump drying system in the washing machine is used as an example for explanation. The dual-duct heat pump drying system is composed of a first variable frequency compressor, a second variable frequency compressor, a fixed frequency fan and a variable frequency fan combination (i.e., a set of variable frequency fan variable frequency compressors and a set of fixed frequency fan variable frequency compressors), and the inlet and outlet of the left and right ducts are respectively provided with temperature sensors. Specifically, the following steps are included:

[0211] S1: Drying mode is on.

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

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

[0214] S4: Enter the drying and heating mode.

[0215] S5: Determine whether the inlet air temperature cross temperature difference is greater than T1; if so, return to execute S4; if not, execute S6.

[0216] In S5, the first inlet and outlet temperature cross temperature difference 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 is reached. When the first inlet temperature cross temperature difference is less than or equal to T1, S6 is executed to determine that the drying temperature is reached. It should be noted that by adjusting the value of T1 in this step, it can be converted to when the first inlet temperature cross temperature difference is less than T1, it is determined that the drying temperature is reached.

[0217] S6: Determine whether the drying temperature is reached.

[0218] S7: Orderly reduce the frequency of the variable frequency compressor to keep its drying temperature at the drying temperature.

[0219] S8: Enter the internal circulation drying mode.

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

[0221] In S9, the second inlet and outlet air temperature crossover temperature difference of the left and right channels of the dual-duct heat pump drying system is calculated and compared with the second preset temperature value T2 to determine whether the drying temperature is reached and the drying end stage is reached.

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

[0223] S10: Adjust the variable frequency fan to run at low frequency.

[0224] S11: Determine whether the determination condition is met.

[0225] The dryness determination condition can be flexibly set by those skilled in the art, and no specific limitation is imposed on this in the embodiments of the present application. For example, it can be set to determine that the dryness determination condition is met after the dryness determination temperature is reached for a specific period of time.

[0226] S12: End the drying mode.

[0227] The dual-duct heat pump drying system control method provided in the embodiment of the present application can accurately reflect the humidity and temperature status of the clothes in the drying chamber by real-time monitoring and comparing the temperature difference between the inlet and outlet, thereby intelligently adjusting the operating frequency of the variable frequency fan and / or compressor. This control strategy based on temperature difference feedback not only realizes precise temperature control and air volume adjustment during the drying process, but also ensures accurate judgment of the drying endpoint, avoiding the problem of over-drying or under-drying.

[0228] According to an embodiment of the present application, a dual-duct heat pump drying system control method is provided, the method is applied to a device provided with a dual-duct heat pump drying system, the inlet and outlet of each of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, the left and right ducts include a left duct and a right duct respectively connected to the device, a first fan and a first two-device component forming a first heat pump system with a first compressor are provided in the left duct, and a second fan and a second two-device component forming a second heat pump system with a second compressor are provided 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 device; the method includes performing the following processing during the drying process:

[0229] Determining the operating frequency of the variable frequency device at least according to the first drying mode;

[0230] Determine whether to enter the next drying mode of the first drying mode according to the measured values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts, or determine whether to enter the first drying mode according to the measured values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts;

[0231] The drying process includes at least one of a drying temperature rise mode, an internal circulation drying mode and a drying dryness determination mode which are executed in chronological order. The first drying mode may be any mode included in the drying process.

[0232] In an optional implementation, the method of determining the operating frequency of the variable frequency device at least according to the first drying mode may be:

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

[0234] The arrangement of the variable frequency device in the left and right air ducts is equivalent to the combination of the compressor and the fan in the dual air duct heat pump drying system shown in the above embodiments. The different combinations of the compressor and the fan indicate that the arrangement of the variable frequency device in the left and right air ducts is different, which further indicates that the operating frequency of the variable frequency device is different.

[0235] In the actual implementation process, 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 can be determined by the following methods:

[0236] Method 1: When the arrangement is that the variable frequency device includes 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 the high frequency or to low frequency; it should be noted that the frequency adjustment of the variable frequency device in the internal circulation drying mode is aimed at keeping the drying temperature near the set value or within the set range.

[0237] and / or,

[0238] Mode 2: When 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, and in the drying and dryness determination mode, the operating frequency of the first fan is determined to be low frequency;

[0239] and / or,

[0240] Method three: When the arrangement is that the variable frequency device includes 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 one 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 the high frequency, and in the drying dryness 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 the 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, so that the determined operating frequency is more reliable.

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

[0243] A first arrangement in which only the first fan and the second fan are variable frequency devices; a second arrangement in which only the first compressor is a variable frequency device; a third arrangement in which only the second fan is not a variable frequency device; and a fourth arrangement in which only the first compressor and the second fan are variable frequency devices.

[0244] Based on the above arrangement, according to the first drying mode and the arrangement of the variable frequency device in the left and right air ducts, the method for determining the working frequency of the variable frequency device can be as follows:

[0245] In the case of the first arrangement: in the drying and heating mode, the operating frequency of the variable frequency device is determined to be high frequency, and in the drying and dryness determination mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0246] In the case of the second 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 variable frequency device is reduced to below high frequency, and in the drying dryness judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0247] In the case of 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, and in the drying judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or,

[0248] In the case of 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, and in the drying judgment mode, the operating frequency of the second fan is determined to be low frequency; and / or,

[0249] In any arrangement and any mode among the drying temperature rise mode, the internal circulation drying mode and the drying dryness judgment mode, the equipment other than the variable frequency equipment is kept running at a fixed frequency.

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

[0251] In an optional embodiment, the method of determining whether to enter the next drying mode of the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts may be as follows:

[0252] According to the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts, the first inlet and outlet air temperature cross temperature difference in the first drying mode is calculated. If the first inlet and outlet air temperature cross temperature difference is less than the first preset temperature value, the next drying mode is entered.

[0253] The specific numerical value of the first preset temperature value can be flexibly set by those skilled in the art, and is not specifically limited in the embodiments of the present application.

[0254] In an optional embodiment, the method of determining whether to enter the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts may be as follows:

[0255] Based on the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right air ducts, the second inlet and outlet air temperature cross temperature difference in the previous drying mode of the first drying mode is calculated; if the second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value, the first drying mode is entered from the previous drying mode.

[0256] The specific numerical value of the second preset temperature value can be flexibly set by those skilled in the art, and is not specifically limited in the embodiments of the present application.

[0257] The dual-duct heat pump drying system control method provided in the embodiment of the present application determines whether to enter the first drying mode or the next drying mode of the first drying mode according to the measurement values ​​of the temperature sensors set at the inlets and outlets of the left and right ducts during the drying process of the equipment equipped with the dual-duct heat pump drying system. The operating frequency of the variable frequency device is determined by the determined specific drying mode, and the determined operating frequency is more reliable and accurate.

[0258] According to an embodiment of the present application, a dual-duct heat pump drying system control device is provided, which is applied to a device provided with a dual-duct heat pump drying system, wherein the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, and the left and right ducts include a left duct and a right duct respectively connected to the device, and the left and right ducts are respectively provided with a fan and two-device components forming a heat pump system with a compressor, with reference to Figure 8 The dual-duct heat pump drying system control device includes the following functional modules:

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

[0260] A first calculation module 802 is used to calculate a first inlet and outlet temperature cross temperature difference according to the temperature sensor measurement values ​​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 the variable frequency fan according to a first preset rule and switch to the internal circulation drying mode when the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value;

[0262] A second calculation module 804 is used to calculate a second inlet and outlet temperature cross temperature difference according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets 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 the variable frequency fan according to the second preset rule when the second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value, until the drying is completed after the drying condition is met.

[0264] Optionally, in an implementation of this embodiment, when the combination of the compressor and the 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 to:

[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 fixed frequency.

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

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

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

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

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

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

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

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

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

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

[0276] Optionally, in an implementation of this embodiment, when the combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a fixed-frequency fan and a variable-frequency compressor, or a combination of 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 the variable frequency fan are adjusted to operate at high frequency, and the fixed frequency fan and the fixed frequency compressor are adjusted to operate at a fixed frequency.

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

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

[0280] The second adjustment module is specifically used to: when the second inlet and outlet temperature cross temperature difference is less than a second preset temperature value, lower the operating frequency of the variable frequency fan until the drying is completed after the drying condition is met.

[0281] The dual-duct heat pump drying system control device provided in the embodiment of the present application fully considers the working characteristics and advantages of different compressor and fan combinations, and realizes precise control and dynamic optimization of the drying process by optimizing the inlet and outlet air temperature cross judgment algorithm and the variable frequency fan and compressor frequency adjustment strategy. For different compressor / fan types in the left and right ducts, the energy efficiency ratio and drying efficiency of the dual-duct heat pump drying system can be significantly improved, and the drying energy consumption can be reduced, achieving a more balanced drying effect.

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

[0283] An embodiment of the present invention further provides a product that implements various method embodiments of the present invention, and the product may be a computer software product, or an electronic device or hardware product that installs or integrates the computer software product, and at least two sensing devices and an electric door switch device are provided on the outer surface of the electronic device. Preferably, the electronic device is a washing machine. The washing machine may execute the method shown in any of the above method embodiments to control a dual-duct heat pump drying system. The washing machine may also be provided with a dual-duct heat pump drying system control device shown in the above device embodiment to control the dual-duct heat pump drying system of the washing machine.

[0284] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0285] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0286] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0287] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0288] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0289] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0290] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0291] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A dual-duct heat pump drying system control method, characterized in that: The method is applied to equipment provided with a dual-duct heat pump drying system, wherein the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, the left and right ducts include a left duct and a right duct respectively connected to the equipment, and the left and right ducts are respectively provided with a fan and two-device components forming a heat pump system with a compressor; the method comprises: After the drying mode of the equipment 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 dual-duct heat pump drying system; After entering the drying and heating mode, the first inlet and outlet air temperature crossover temperature difference is calculated according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts; When the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, adjusting the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule, and switching to the internal circulation drying mode; Calculate the second inlet and outlet air temperature crossover temperature difference based on the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts; When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the operating power of the variable frequency compressor and / or the variable frequency fan is adjusted according to the second preset rule until the drying condition is met and the drying is completed.

2. The method according to claim 1, characterized in that In the case where the combination of the compressor and the fan 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 device is turned on, the step of determining the working power of each compressor and fan according to the combination of the compressor and the fan in the dual-duct heat pump drying system comprises: 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 fixed frequency.

3. The method according to claim 2, characterized in that When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the step of adjusting the working power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule until the drying condition is met and the drying ends includes: When the second inlet and outlet air temperature crossover temperature difference is less than the second preset temperature value, the two variable frequency fans are adjusted to operate at a low frequency, and the two fixed frequency compressors are maintained to operate at a fixed frequency until the drying condition is met and the drying is completed.

4. The method according to claim 1, wherein, when the combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a fixed-frequency compressor, a variable-frequency compressor and a combination of two fixed-frequency fans, after the drying mode of the device is turned on, the step of determining the working power of each compressor and fan according to the combination of the compressor and the fan in the dual-duct heat pump drying system comprises: After the drying mode of the equipment is turned on, the variable frequency compressor is adjusted to operate at a high frequency, and the dual fixed frequency fans and the fixed frequency compressor are adjusted to operate at a fixed frequency.

5. The method according to claim 4, characterized in that When the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switching to the internal circulation drying mode includes: When the first inlet and outlet air temperature cross-temperature difference is less than the first preset temperature value, the operating frequency of the variable frequency compressor is lowered, the dual fixed frequency fans and the fixed frequency compressor are maintained to operate at a fixed frequency, and the mode is switched to the internal circulation drying mode.

6. The method according to claim 1, characterized in that In the case where the combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a first variable frequency compressor, a second variable frequency compressor, a constant frequency fan and a variable frequency fan, after the drying mode of the device is turned on, the step of determining the working power of each compressor and the fan according to the combination of the compressor and the fan in the dual-duct heat pump drying system includes: After the drying mode of the device is turned on, the first variable frequency compressor and the variable frequency fan are adjusted to operate at a high frequency, and the second variable frequency compressor and the fixed frequency fan are adjusted to operate at a fixed frequency.

7. The method according to claim 6, characterized in that When the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switching to the internal circulation drying mode includes: When the first inlet and outlet air temperature cross-temperature difference is less than the first preset temperature value, the operating power of the first variable frequency compressor and the variable frequency fan is reduced, the second variable frequency compressor and the fixed frequency fan are maintained to operate at a fixed frequency, and the mode is switched to the internal circulation drying mode.

8. The method according to claim 1, characterized in that: In the case where the combination of the compressor and the fan in the dual-duct heat pump drying system is a combination of a fixed-frequency fan and a variable-frequency compressor, or a combination of a variable-frequency fan and a fixed-frequency compressor, after the drying mode of the device is turned on, the step of determining the working power of each compressor and fan according to the combination of the compressor and the fan in the dual-duct heat pump drying system includes: After the drying mode of the equipment is turned on, the variable frequency compressor and the variable frequency fan are adjusted to operate at high frequency, and the fixed frequency fan and the fixed frequency compressor are adjusted to operate at a fixed frequency.

9. The method according to claim 8, characterized in that When the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value, the step of adjusting the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switching to the internal circulation drying mode includes: When the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, lowering the operating frequency of the variable frequency compressor and switching to an internal circulation drying mode; When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the step of adjusting the working power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule until the drying condition is met and the drying ends includes: When the second inlet and outlet temperature cross temperature difference is less than the second preset temperature value, the operating frequency of the variable frequency fan is lowered until the drying is completed after the drying condition is met.

10. A dual-duct heat pump drying system control device, characterized in that: The device is applied to equipment provided with a dual-duct heat pump drying system, wherein the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors; the device comprises: A first determination module is used to determine the working power of each compressor and fan according to the combination mode of the compressor and the fan in the dual-duct heat pump drying system after the drying mode of the device is turned on; A first calculation module is used to calculate a first inlet and outlet air temperature crossover temperature difference according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right air ducts after entering the drying and heating mode; A first adjustment module, configured to adjust the operating power of the variable frequency compressor and / or the variable frequency fan according to a first preset rule and switch to an internal circulation drying mode when the first inlet and outlet air temperature cross temperature difference is less than a first preset temperature value; A second calculation module is used to calculate the second inlet and outlet air temperature cross temperature difference according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts; The second adjustment module is used to adjust the working power of the variable frequency compressor and / or the variable frequency fan according to the second preset rule when the second inlet and outlet air temperature cross temperature difference is less than the second preset temperature value, until the drying is completed after the drying condition is met.

11. A dual-duct heat pump drying system control method, characterized in that: The method is applied to equipment provided with a dual-duct heat pump drying system, wherein the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, the left and right ducts include a left duct and a right duct respectively connected to the equipment, the left duct is provided with a first fan and a first two-device component forming a first heat pump system with a first compressor, the right duct is provided with a second fan and a second two-device component forming a second heat pump system with a second compressor, and at least one of the first fan, the second fan, the first compressor and the second compressor is a variable frequency device; the method includes performing the following processing during the drying process: Determining the operating frequency of the variable frequency device at least according to the first drying mode; Determine whether to enter the next drying mode of the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts, or, Determining whether to enter the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts; The drying process includes at least one of a drying temperature rise mode, an internal circulation drying mode and a drying dryness determination mode which are executed in chronological order.

12. The method according to claim 11, characterized in that The step of determining the operating frequency of the variable frequency device at least according to the first drying mode includes: When the first drying mode is the drying temperature-raising mode, the operating frequency of at least one or all of the variable frequency devices is determined to be a high frequency.

13. The method according to claim 11, characterized in that The step of determining the operating frequency of the variable frequency device at least according to the first drying mode includes: The operating frequency of the variable frequency device is determined according to the first drying mode and the arrangement of the variable frequency device in the left and right air ducts.

14. The method according to claim 13, characterized in that The step of determining the operating 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 includes: In the case where the variable frequency device includes the first compressor in the arrangement mode, the operating frequency of the first compressor is determined to be high frequency in the drying and heating mode, and the operating frequency of the first compressor is reduced to below high frequency or to low frequency in the internal circulation drying mode; and / or, In the case where the arrangement is that the variable frequency device includes the first fan, in the drying temperature rise mode, the operating frequency of the first fan is determined to be high frequency, and in the drying dryness determination mode, the operating frequency of the first fan is determined to be low frequency; and / or, In the case where the arrangement is that the variable frequency device includes 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 one 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 the high frequency, and in the drying judgment mode, the operating frequency of at least one fan is determined to be low frequency.

15. The method according to claim 13, characterized in that The arrangement includes: Only the first fan and the second fan are in the first arrangement of the variable frequency devices; A second arrangement in which only the first compressor is the variable frequency device; A third arrangement in which only the second fan is not the variable frequency device; In the fourth arrangement, only the first compressor and the second fan are the variable frequency devices.

16. The method according to claim 15, characterized in that The step of determining the operating 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 includes: In the case of the first arrangement: in the drying and heating mode, the operating frequency of the variable frequency device is determined to be high frequency, and in the drying dryness determination mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or, In the case of the second 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 variable frequency device is reduced to below high frequency, and in the drying dryness judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or, In the case of 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 frequencies of the first fan and the first compressor are determined to be below high frequency, and in the drying judgment mode, the operating frequency of the variable frequency device is determined to be low frequency; and / or, In the case of 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, and in the drying judgment mode, the operating frequency of the second fan is determined to be low frequency; and / or, In any arrangement and any mode among the drying temperature rising mode, the internal circulation drying mode and the drying determination mode, the devices other than the variable frequency device are kept running at a fixed frequency.

17. The method according to claim 11, characterized in that The step of determining whether to enter the next drying mode of the first drying mode according to the temperature sensor measurement values ​​set at the inlets and outlets of the left and right air ducts comprises: According to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts, the first inlet and outlet air temperature crossover temperature difference under the first drying mode is calculated, If the first inlet and outlet air temperature crossover temperature difference is less than a first preset temperature value, entering the next drying mode; The determining whether to enter the first drying mode according to the temperature sensor measurement values ​​set at the inlet and outlet of the left and right air ducts includes: Calculate the second inlet and outlet air temperature crossover temperature difference in the drying mode before the first drying mode according to the measurement values ​​of the temperature sensors arranged at the inlets and outlets of the left and right air ducts; If the second inlet and outlet air temperature crossover temperature difference is less than a second preset temperature value, the first drying mode is entered from the previous drying mode.

18. A washing machine, characterized in that: The washing machine is provided with a dual-duct heat pump drying system, and the inlet and outlet of the left and right ducts of the dual-duct heat pump drying system are respectively provided with temperature sensors, and the left and right ducts include a left duct and a right duct respectively connected to the device, and the left and right ducts are respectively provided with a fan and two-device components that form a heat pump system with a compressor; the washing machine adopts the method described in any one of claims 1-9 or 11-17, or has a dual-duct heat pump drying system control device as described in claim 10 to control the dual-duct heat pump drying system of the washing machine.

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