Control method of heat pump clothes dryer

Abstract

The invention relates to the technical field of heat pump clothes dryers, in particular to a control method of a heat pump clothes dryer, and aims to solve the problem that program operation power errors are easily caused by inaccurate judgment on environment temperature during continuous operation of a conventional heat pump clothes dryer. In order to achieve the purpose, the control method of the heat pump clothes dryer comprises the following steps that S1, when the heat pump clothes dryer operates for the first time, the environment temperature is detected and recorded; s2, when the heat pump clothes dryer operates subsequently, whether the environment temperature needs to be detected again or not is judged according to the clothes drying program instruction selected by the user and the time interval between two adjacent times of operation of the heat pump clothes dryer; and S3, the operation power of the heat pump clothes dryer corresponding to the clothes drying program instruction selected by the user is determined according to the judgment result. The method has the effects that the environment temperature can be accurately judged, program running power errors are avoided, and the drying efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump clothes dryers, and in particular provides a control method for a heat pump clothes dryer. Background Art

[0002] As a household appliance that can quickly dry clothes, a clothes dryer allows people to wear dry and comfortable clothes in humid weather. It also reduces the space used for drying clothes and improves people's quality of life. Therefore, clothes dryers are becoming more and more popular among users.

[0003] However, with the application of dryers, people have put forward higher requirements for the quality, speed, uniformity and energy consumption of drying. Heat pump dryers are the main product type in the current dryer market due to their energy-saving advantages. However, the control logic of heat pump dryers for judging the ambient temperature is relatively simple, which leads to the same program running by the heat pump system in low-temperature environment, normal temperature environment and high-temperature environment. This leads to the system temperature in low-temperature environment and normal temperature environment being lower than that in high-temperature environment, which in turn makes the temperature inside the dryer barrel lower, so the drying time in low-temperature environment and normal temperature environment is longer than that in high-temperature environment.

[0004] At present, there are the following problems in the judgment of ambient temperature by heat pump dryers: when users use the heat pump dryer continuously, the temperature of the condenser outlet and the compressor outlet is higher than the ambient temperature. At this time, the error in judging the environmental problem based on the condenser outlet and the compressor outlet is large, and it is easy to make wrong judgments; although the ambient temperature sensor can accurately judge the ambient temperature, adding an ambient temperature sensor requires changing the computer version hardware, wiring harness layout and structural design, etc., which is costly.

[0005] Therefore, how to provide a control method for a heat pump dryer that can accurately judge the ambient temperature of the heat pump dryer without increasing the cost is a technical problem that those skilled in the art need to solve urgently. Summary of the invention

[0006] The present invention aims to solve the above technical problem, that is, to solve the problem that the current heat pump dryer cannot accurately judge the ambient temperature during continuous operation, which may cause program operation power errors.

[0007] In a first aspect, the present invention provides a control method for a heat pump dryer, comprising: step S1, detecting and recording the ambient temperature when the heat pump dryer is operated for the first time; step S2, when the heat pump dryer is operated subsequently, judging whether it is necessary to re-detect the ambient temperature according to the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer; step S3, determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result.

[0008] When the above technical scheme is adopted, when the heat pump dryer of the present invention is operated for the first time, the temperature of the heat pump dryer condenser outlet and the temperature of the compressor exhaust are close to the ambient temperature, and the ambient temperature can be detected and recorded accordingly, and the detection result is accurate; when the heat pump dryer is operated subsequently, it can be accurately determined whether the ambient temperature needs to be re-detected according to the drying program instruction selected by the user and the time interval between two adjacent heat pump dryer operations. It can also be understood that the ambient temperature is detected only when the detection is required and the ambient temperature can be accurately measured, and the operating power of the heat pump dryer is determined at the accurate ambient temperature and the drying program instruction selected by the user is run, which can ensure that the system temperature of the heat pump dryer is adapted to the ambient temperature, that is, the corresponding system temperature can be controlled for different ambient temperatures of low temperature, medium temperature and high temperature, thereby improving the drying efficiency and avoiding the problem of program operating power error caused by inaccurate judgment of the ambient temperature during subsequent operation, that is, the mismatch between the system temperature and the ambient temperature.

[0009] Furthermore, the "determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user based on the judgment result" in step S3 specifically includes: if the judgment result is no, determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the ambient temperature when the heat pump dryer is operated for the first time; if the judgment result is yes, re-detecting and recording the ambient temperature, and determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the re-detected ambient temperature.

[0010] When the above technical solution is adopted, when the present invention does not need to re-detect the ambient temperature, it can be understood that according to the drying program instructions selected by the user, there is no need to re-detect the ambient temperature or the ambient temperature detected at this time cannot be accurately detected and needs to be avoided. At this time, the operating power of the heat pump dryer is determined based on the ambient temperature recorded in the first operation and the drying program instructions selected by the user are run, so that a relatively accurate ambient temperature can be obtained and the drying efficiency is improved.

[0011] Furthermore, the "determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user based on the judgment result" in step S3 specifically includes: if the judgment result is no, determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the ambient temperature most recently re-detected by the heat pump dryer; if the judgment result is yes, re-detecting and recording the ambient temperature, and determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the re-detected ambient temperature.

[0012] When adopting the above technical solution, when the present invention determines that there is no need to re-detect the ambient temperature and the temperature has been re-detected before, the operating power of the heat pump dryer is determined based on the most recently re-detected ambient temperature and the drying program instructions selected by the user are run.

[0013] Further, the drying program instruction selected by the user includes a low-temperature drying program or a high-temperature drying program.

[0014] Furthermore, the "determining whether it is necessary to re-detect the ambient temperature based on the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer" in step S2 specifically includes: if the user selects a low-temperature drying program, it is determined that it is not necessary to re-detect the ambient temperature; if the user selects a high-temperature drying program, it is determined whether it is necessary to re-detect the ambient temperature based on the time interval between two adjacent operations of the heat pump dryer.

[0015] When adopting the above technical solution, the present invention requires accurate ambient temperature when the user selects a high-temperature drying program. When the time interval meets the conditions, that is, when the ambient temperature can be accurately detected, the ambient temperature is re-detected to improve the drying efficiency under the high-temperature drying program.

[0016] Further, the step of “if the user selects the high-temperature drying program, judging whether it is necessary to re-detect the ambient temperature according to the time interval between two adjacent heat pump dryer operations” specifically includes: if the user selects the high-temperature drying program, judging whether it is necessary to re-detect the ambient temperature according to the time interval △T and the preset time T; if △T<T, judging that it is not necessary to re-detect the ambient temperature; if △T≥T, judging that it is necessary to re-detect the ambient temperature;

[0017] The time interval △T is the time from the end of the last heat pump dryer operation to the start of the current heat pump dryer operation; the preset time T is the maximum time required for the system temperature to drop to the ambient temperature after the heat pump dryer operation ends.

[0018] When adopting the above technical solution, the present invention provides a specific method for determining whether it is necessary to re-detect the ambient temperature based on the time interval when selecting a high-temperature drying program. It can be understood that when the time interval is greater than the preset time T, the system temperature has been reduced to the ambient temperature, that is, the ambient temperature can be accurately judged by the condenser outlet temperature and the compressor exhaust temperature.

[0019] Furthermore, the step of detecting the ambient temperature specifically includes: detecting the condenser outlet temperature and the compressor exhaust temperature; and determining the ambient temperature according to the condenser outlet temperature and the compressor exhaust temperature.

[0020] Furthermore, the step of "determining the ambient temperature based on the condenser outlet temperature and the compressor exhaust temperature" specifically includes: setting a first correction coefficient a based on the condenser outlet temperature t1; setting a second correction coefficient b based on the compressor exhaust temperature t2; and calculating the ambient temperature t according to the following formula: t=a×t1+b×t2.

[0021] When adopting the above-mentioned technical scheme, the present invention provides a specific method for judging the ambient temperature based on the condenser outlet temperature and the compressor exhaust temperature. Those skilled in the art can understand that when the system temperature is reduced to the ambient temperature, the temperature of the condenser outlet and the compressor exhaust is close to the ambient temperature, and there is a situation where the ambient temperature is closer to the condenser outlet or the compressor exhaust temperature. According to different situations, the corresponding correction coefficient is set to obtain an accurate ambient temperature detection value.

[0022] Furthermore, the step of “setting the first correction coefficient a according to the condenser outlet temperature t1” specifically includes: presetting a first correction coefficient matrix [a1a2a3]; presetting a temperature matrix [c1c2], where c1<c2;

[0023] When t1<c1, the first correction coefficient a=a1;

[0024] When c1<t1≤c2, the first correction coefficient a=a2;

[0025] When t1>c2, the first correction coefficient a=a3;

[0026] Furthermore, the step of “setting the second correction coefficient b according to the compressor exhaust temperature t2” specifically includes: presetting a second correction coefficient matrix [b1b2b3]; presetting a temperature matrix [c1c2], where c1<c2;

[0027] When t2<c1, the second correction coefficient b=b1;

[0028] When c1<t2≤c2, the second correction coefficient b=b2;

[0029] When t2>c2, the second correction coefficient b=b3.

[0030] When adopting the above technical solution, the present invention provides a specific method for setting the correction coefficient. It should be noted that technical personnel in this field can select the corresponding first correction coefficient a according to the specific value of the condenser outlet temperature t1, and select the corresponding second correction coefficient b according to the specific value of the compressor exhaust temperature t2, so as to be able to determine the ambient temperature more accurately.

[0031] When the above technical solution is adopted, the beneficial effects of the present invention are:

[0032] (1) When the heat pump dryer is in continuous operation, the present invention accurately determines the ambient temperature and avoids program operation errors. Specifically, when the heat pump dryer is operated for the first time, the ambient temperature can be accurately detected and recorded. During subsequent operations, according to the drying program instruction selected by the user, such as a low-temperature drying program or a high-temperature drying program, and the time interval between two adjacent heat pump dryer operations, specifically when the user selects a high-temperature drying program, the time interval is determined to be greater than the preset time. When the time interval is greater than the preset time, the system temperature has dropped to the ambient temperature, and the ambient temperature can be accurately detected again. Therefore, the present invention can make corresponding judgments according to different drying instructions selected by the user, thereby avoiding the situation in which program operation errors caused by inaccurate ambient temperature lead to low drying efficiency.

[0033] (2) When the system temperature drops to the ambient temperature, the present invention comprehensively determines the ambient temperature based on the condenser outlet temperature and the compressor exhaust temperature. Those skilled in the art can set the corresponding correction coefficient based on the specific detection values ​​of the condenser outlet and the compressor exhaust, so that the calculated ambient temperature is closer to the actual ambient temperature, thereby obtaining a more accurate ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0035] Figure 1 is a flow chart of the main steps of the control method of the heat pump dryer of the present invention;

[0036] Figure 2 is a flowchart of specific steps of a first embodiment of a control method for a heat pump clothes dryer of the present invention;

[0037] Figure 3 is a flowchart of specific steps of a second embodiment of a control method for a heat pump clothes dryer of the present invention;

[0038] Figure 4 is a flowchart of specific steps of a third embodiment of a control method for a heat pump clothes dryer of the present invention;

[0039] Figure 5 It is a flowchart of specific steps of the fourth embodiment of the control method of the heat pump dryer of the present invention. DETAILED DESCRIPTION

[0040] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. For example, although the steps of the method of the present invention are described in a specific order in this application, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in different orders.

[0041] like Figures 1 to 5 As shown, the embodiment of the present invention discloses a control method for a heat pump dryer, comprising the following steps:

[0042] Step S1, when the heat pump dryer is operated for the first time, detecting and recording the ambient temperature;

[0043] Step S2, when the heat pump dryer is subsequently operated, judging whether it is necessary to re-detect the ambient temperature according to the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer;

[0044] Step S3, determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result.

[0045] It should be noted that the first operation of the heat pump dryer should be understood as the first operation of the heat pump dryer or the first operation after a long interval, and the subsequent operation of the heat pump dryer may be continuous operation.

[0046] As a preferred embodiment of the present invention, the step S3 of "determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result" specifically includes:

[0047] If the result of the determination is no, then determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the ambient temperature when the heat pump dryer is operated for the first time;

[0048] If the judgment result is yes, the ambient temperature is re-detected and recorded, and the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user is determined according to the re-detected ambient temperature.

[0049] This situation corresponds to the situation where the ambient temperature is not re-detected during several operations between the first operation and the current operation of the heat pump dryer.

[0050] As a preferred embodiment of the present invention, the step S3 of "determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result" specifically includes:

[0051] If the result of the determination is no, the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user is determined according to the ambient temperature re-detected when the heat pump dryer was last operated;

[0052] If the judgment result is yes, the ambient temperature is re-detected and recorded, and the power of the heat pump dryer corresponding to the drying program instruction selected by the user is determined according to the re-detected ambient temperature.

[0053] This situation corresponds to the situation where the ambient temperature is re-detected during several operations of the heat pump dryer between the first operation and the current operation, and the drying program instruction selected by the user is run at the most recently re-detected ambient temperature.

[0054] For example, in the subsequent operation of the heat pump dryer, the ambient temperature was rechecked during the second operation and the third operation, and the judgment result was no during the fourth operation, then the drying program instructions selected by the user this time will be run with the ambient temperature rechecked during the most recent operation, i.e., the third operation; for example, in the subsequent operation of the heat pump dryer, the ambient temperature was rechecked during the second operation, and the ambient temperature was not rechecked during the third operation, and the judgment result was no during the fourth operation, then the drying program instructions selected by the user this time will be run with the ambient temperature rechecked during the most recent operation, i.e., the second operation.

[0055] As a preferred embodiment of the present invention, the drying program instruction selected by the user includes a low-temperature drying program or a high-temperature drying program.

[0056] The drying program instructions of the present invention are divided into a low-temperature drying program and a high-temperature drying program according to different drying temperatures. Those skilled in the art can understand that, for the high-temperature drying program with a higher drying temperature, it requires a higher degree of accuracy in detecting the ambient temperature, that is, when the high-temperature drying program is selected, the difference between the drying temperature and the ambient temperature is relatively large, and it is necessary to adjust the system temperature of the dryer according to the accurate ambient temperature to ensure the drying efficiency; while for the low-temperature drying program, the difference between the corresponding drying temperature and the ambient temperature is relatively small. When the dryer is running continuously, it is sufficient to run the low-temperature drying program only at the previously detected ambient temperature.

[0057] As a preferred embodiment of the present invention, the step S2 of "determining whether it is necessary to re-detect the ambient temperature according to the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer" specifically includes:

[0058] If the user selects a low-temperature drying program, it is determined that there is no need to re-detect the ambient temperature;

[0059] If the user selects a high-temperature drying program, whether the ambient temperature needs to be re-detected is determined based on the time interval between two adjacent heat pump dryer operations.

[0060] As a preferred embodiment of the present invention, the step of "if the user selects a high-temperature drying program, determining whether it is necessary to re-detect the ambient temperature based on the time interval between two adjacent heat pump dryer operations" specifically includes:

[0061] If the user selects the high-temperature drying program, it is determined whether the ambient temperature needs to be re-tested based on the time interval △T and the preset time T;

[0062] If △T<T, it is determined that there is no need to re-detect the ambient temperature;

[0063] If △T ≥ T, it is determined that the ambient temperature needs to be retested;

[0064] The time interval △T is the time from the end of the last heat pump dryer operation to the start of the current heat pump dryer operation; the preset time T is the maximum time required for the system temperature to drop to the ambient temperature after the heat pump dryer operation ends.

[0065] In a specific embodiment, the preset time T is ≥ 4 hours.

[0066] As a preferred embodiment of the present invention, the step of detecting the ambient temperature specifically includes:

[0067] Detect the condenser outlet temperature and compressor exhaust temperature;

[0068] The ambient temperature is determined based on the condenser outlet temperature and the compressor exhaust temperature.

[0069] As a preferred embodiment of the present invention, the step of "determining the ambient temperature according to the condenser outlet temperature and the compressor exhaust temperature" specifically includes:

[0070] Setting a first correction coefficient a according to the condenser outlet temperature t1;

[0071] Setting a second correction coefficient b according to the compressor exhaust temperature t2;

[0072] The ambient temperature t is calculated according to the following formula:

[0073] t=a×t1+b×t2.

[0074] As a preferred embodiment of the present invention, the step of "setting the first correction coefficient a according to the condenser outlet temperature t1" specifically includes: presetting the first correction coefficient matrix [a1a2a3]; presetting the temperature matrix [c1c2], where c1<c2;

[0075] When t1<c1, the first correction coefficient a=a1;

[0076] When c1<t1≤c2, the first correction coefficient a=a2;

[0077] When t1>c2, the first correction coefficient a=a3;

[0078] As a preferred embodiment of the present invention, the step of "setting the second correction coefficient b according to the compressor exhaust temperature t2" specifically includes: presetting the second correction coefficient matrix [b1b2b3]; presetting the temperature matrix [c1c2], where c1<c2;

[0079] When t2<c1, the second correction coefficient b=b1;

[0080] When c1<t2≤c2, the second correction coefficient b=b2;

[0081] When t2>c2, the second correction coefficient b=b3.

[0082] It should be noted that those skilled in the art can specifically set the first correction coefficient matrix and the second correction coefficient matrix, for example, the first correction coefficient matrix is ​​preset to [0.40.50.6], and the second correction coefficient matrix is ​​preset to [0.60.50.4]; then the first calculation formula for the corresponding ambient temperature t and the condenser outlet temperature t1 and the compressor exhaust temperature t2 can be: t = 0.5 × t1 + 0.5 × t2, in which case the ambient temperature corresponds to the middle value of the condenser outlet temperature and the compressor exhaust temperature; the second calculation formula is t = 0.4 × t1 + 0.6 × t2, in which case the ambient temperature value is closer to The value of the compressor exhaust temperature is close to the value of the compressor exhaust temperature; the third calculation formula is t=0.6×t1+0.4×t2. The ambient temperature value in this case is closer to the value of the condenser temperature; and it can be understood that the above calculation formula can be selected for the different ambient temperatures in different seasons. For example, in the summer when the temperature is higher, if the actual ambient temperature is closer to the value of the condenser outlet temperature, the third calculation formula can be selected for calculation; thus, those skilled in the art can set the corresponding correction coefficient according to the different values ​​of the condenser outlet temperature t1 and the compressor exhaust temperature t2, and thus obtain the accurate ambient temperature value.

[0083] Example 1

[0084] like Figure 2 As shown, the control method of the heat pump dryer of this embodiment includes the following steps:

[0085] Step S10, turning on the heat pump dryer;

[0086] Step S11, the heat pump dryer is operated for the first time, the user selects a high-temperature drying program, detects and records the ambient temperature, and operates the high-temperature drying program until the drying is completed;

[0087] Step S12, the heat pump dryer is operated for the second time in a row, and the user selects a low-temperature drying program, then the operating power of the heat pump dryer corresponding to the low-temperature drying program is determined according to the ambient temperature recorded during the first operation, and the low-temperature drying program is operated until the drying is completed;

[0088] Step S13, the heat pump dryer runs for the third time in a row, and the user selects a low-temperature drying program. The operating power of the heat pump dryer corresponding to the low-temperature drying program is determined according to the ambient temperature recorded during the first run, and the low-temperature drying program is run until the drying is completed.

[0089] Example 2

[0090] like Figure 3 As shown, the control method of the heat pump dryer of this embodiment includes the following steps:

[0091] Step S20, turning on the heat pump dryer;

[0092] Step S21, the heat pump dryer is operated for the first time, the user selects a high-temperature drying program, detects and records the ambient temperature, and operates the high-temperature drying program until the drying is completed;

[0093] Step S22, the heat pump dryer runs for the second time in a row, and the user selects a low-temperature drying program, then the power of the heat pump dryer corresponding to the low-temperature drying program is determined according to the ambient temperature recorded during the first run, and the low-temperature drying program is run until the drying is completed;

[0094] Step S23, the heat pump dryer runs for the third time in a row, and the user selects a high-temperature drying program. If the time interval from the end of the second drying to the start of the third drying is less than the preset time T, the operating power of the heat pump dryer corresponding to the high-temperature drying program is determined according to the ambient temperature recorded during the first run, and the high-temperature drying program is run until the drying is completed; if the time interval from the end of the second drying to the start of the third drying is greater than or equal to the preset time T, it is necessary to re-detect the ambient temperature, determine the operating power of the heat pump dryer corresponding to the high-temperature drying program according to the re-detected ambient temperature, and run the high-temperature drying program until the drying is completed.

[0095] Example 3

[0096] like Figure 4 As shown, the control method of the heat pump dryer of this embodiment includes the following steps:

[0097] Step S30, turning on the heat pump dryer;

[0098] Step S31, the heat pump dryer is operated for the first time, the user selects a low-temperature drying program, detects and records the ambient temperature, and operates the low-temperature drying program until the drying is completed;

[0099] Step S32, the heat pump dryer runs for the second time in a row, and the user selects a high-temperature drying program. If the time interval from the end of the first drying to the start of the second drying is less than the preset time T, the operating power of the heat pump dryer corresponding to the high-temperature drying program is determined according to the ambient temperature recorded during the first operation, and the high-temperature drying program is run until the drying is completed; if the time interval from the end of the first drying to the start of the second drying is greater than or equal to the preset time T, it is necessary to re-detect the ambient temperature, determine the operating power of the heat pump dryer corresponding to the high-temperature drying program according to the re-detected ambient temperature, and run the high-temperature drying program until the drying is completed;

[0100] Step S33, the heat pump dryer runs for the third time in a row, and the user selects a high-temperature drying program. If the time interval from the end of the second drying to the start of the third drying is less than the preset time T, the operating power of the heat pump dryer corresponding to the high-temperature drying program is determined according to the ambient temperature recorded during the first run or the ambient temperature re-detected during the second run, and the high-temperature drying program is run until the drying is completed; if the time interval from the end of the second drying to the start of the third drying is greater than or equal to the preset time T, it is necessary to re-detect the ambient temperature, determine the operating power of the heat pump dryer corresponding to the high-temperature drying program according to the re-detected ambient temperature, and run the high-temperature drying program until the drying is completed.

[0101] Example 4

[0102] like Figure 5 As shown, the control method of the heat pump dryer of this embodiment includes the following steps:

[0103] Step S40, turning on the heat pump dryer;

[0104] Step S41, the heat pump dryer is operated for the first time, the user selects a low-temperature drying program, detects and records the ambient temperature, and operates the low-temperature drying program until the drying is completed;

[0105] Step S42, the heat pump dryer runs for the second time in a row, and the user selects a high-temperature drying program. If the time interval from the end of the first drying to the start of the second drying is less than the preset time T, the operating power of the heat pump dryer corresponding to the high-temperature drying program is determined according to the ambient temperature recorded during the first operation, and the high-temperature drying program is run until the drying is completed; if the time interval from the end of the first drying to the start of the second drying is greater than or equal to the preset time T, it is necessary to re-detect the ambient temperature, determine the operating power of the heat pump dryer corresponding to the high-temperature drying program according to the re-detected ambient temperature, and run the high-temperature drying program until the drying is completed;

[0106] Step S43, the heat pump dryer runs for the third time in a row, and the user selects a low-temperature drying program. The operating power of the heat pump dryer corresponding to the low-temperature drying program is determined according to the ambient temperature recorded during the first run or the ambient temperature re-detected during the second run, and the low-temperature drying program is run until the drying is completed.

[0107] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control method for a heat pump dryer, characterized in that: The steps include: Step S1, when the heat pump dryer is operated for the first time, detecting and recording the ambient temperature; Step S2, when the heat pump dryer is subsequently operated, judging whether it is necessary to re-detect the ambient temperature according to the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer; Step S3, determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result.

2. The control method of the heat pump dryer according to claim 1, characterized in that: The step S3 of "determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result" specifically includes: If the result of the determination is no, then determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the ambient temperature recorded when the heat pump dryer is first operated; and / or, If the judgment result is yes, the ambient temperature is re-detected and recorded, and the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user is determined according to the re-detected ambient temperature.

3. The control method of the heat pump dryer according to claim 1, characterized in that: The step S3 of "operating the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the judgment result" specifically includes: If the result of the determination is no, then determining the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user according to the ambient temperature re-detected by the heat pump dryer the most recently; and / or, If the judgment result is yes, the ambient temperature is re-detected and recorded, and the operating power of the heat pump dryer corresponding to the drying program instruction selected by the user is determined according to the re-detected ambient temperature.

4. The control method of the heat pump dryer according to claim 2 or 3, characterized in that: The drying program instruction selected by the user includes a low-temperature drying program or a high-temperature drying program.

5. The control method of the heat pump dryer according to claim 4, characterized in that: The step S2 of "determining whether it is necessary to re-detect the ambient temperature according to the drying program instruction selected by the user and the time interval between two adjacent operations of the heat pump dryer" specifically includes: If the user selects a low-temperature drying program, it is determined that there is no need to re-detect the ambient temperature; If the user selects a high-temperature drying program, whether the ambient temperature needs to be re-detected is determined based on the time interval between two adjacent heat pump dryer operations.

6. The control method of the heat pump dryer according to claim 5, characterized in that: The steps of "if the user selects a high-temperature drying program, judging whether it is necessary to re-detect the ambient temperature based on the time interval between two adjacent heat pump dryer operations" specifically include: If the user selects the high-temperature drying program, it is determined whether the ambient temperature needs to be re-tested based on the time interval △T and the preset time T; If △T<T, it is determined that there is no need to re-detect the ambient temperature; If △T ≥ T, it is determined that the ambient temperature needs to be retested; The time interval △T is the time from the end of the last heat pump dryer operation to the start of the current heat pump dryer operation; the preset time T is the maximum time required for the system temperature to drop to the ambient temperature after the heat pump dryer operation ends.

7. The control method of the heat pump dryer according to claim 1, characterized in that: The step of detecting the ambient temperature specifically includes: Detect the condenser outlet temperature and compressor exhaust temperature; The ambient temperature is determined based on the condenser outlet temperature and the compressor exhaust temperature.

8. The control method of the heat pump dryer according to claim 7, characterized in that: The step of "determining the ambient temperature according to the condenser outlet temperature and the compressor exhaust temperature" specifically includes: Setting a first correction coefficient a according to the condenser outlet temperature t1; Setting a second correction coefficient b according to the compressor exhaust temperature t2; The ambient temperature t is calculated according to the following formula: t=a×t1+b×t2.

9. The control method of the heat pump dryer according to claim 8, characterized in that: The step of "setting the first correction coefficient a according to the condenser outlet temperature t1" specifically includes: Preset a first correction coefficient matrix [a1a2a3]; Preset a temperature matrix [c1c2], where c1<c2; When t1<c1, the first correction coefficient a=a1; When c1<t1≤c2, the first correction coefficient a=a2; When t1>c2, the first correction coefficient a=a3.

10. The control method of the heat pump dryer according to claim 8, characterized in that: The step of "setting the second correction coefficient b according to the compressor exhaust temperature t2" specifically includes: Preset the second correction coefficient matrix [b1b2b3]; Preset the temperature matrix [c1c2], where c1<c2; When t2<c1, the second correction coefficient b=b1; When c1<t2≤c2, the second correction coefficient b=b2; When t2>c2, the second correction coefficient b=b3.

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