Washing and drying all-in-one machine

Abstract

The embodiment of the invention provides a washing and drying all-in-one machine. The washing and drying all-in-one machine comprises a shell; the drying system is arranged in the shell; the drying system comprises an air duct; a fan and an air heating pipe; a condenser; a return air temperature sensor and a water temperature sensor; the controller is electrically connected with the return air temperature sensor and the water temperature sensor, and the controller is configured to execute the following steps that when a starting instruction of a drying program is received, the inertia value of clothes in the inner barrel is obtained; the air duct return air temperature collected by the return air temperature sensor and the water temperature collected by the water temperature sensor are obtained; determining a first stop judging parameter value and a second stop judging parameter value according to the inertia value; and according to the air channel return air temperature, the water temperature, the first stop judging parameter value and the second stop judging parameter value, the drying program is controlled to stop running. The drying program can be accurately controlled to stop running.

Description

Technical Field

[0001] The present application relates to the technical field of washer-dryers, and in particular to a washer-dryer. Background Art

[0002] A washer-dryer is a machine that combines two functions (washing and drying) for washing clothes, which can effectively shorten the time of washing and drying. For users, if the clothes are still wet (not dried) after the drying program of the washer-dryer stops running, it will be inconvenient to wear / store them; if the clothes are too dry (over-dried) after the drying program of the washer-dryer stops running, it is very likely to cause damage to the material of the clothes. Therefore, how to accurately control the stopping of the drying program is of great significance to users.

[0003] Currently, the drying stop method of a washing and drying machine mainly uses a return air temperature sensor for single stop judgment. However, the temperature sensor cannot accurately detect the air temperature, and a single return air temperature sensor cannot flexibly adapt to changing usage environments. As a result, in high temperature environments in summer / hot areas, the return air temperature sensor is prone to failure in stopping.

[0004] Therefore, there is an urgent need for a washer-dryer that can accurately control the drying program to stop running. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, an embodiment of the present application provides a washer-dryer.

[0006] According to one aspect of an embodiment of the present application, the embodiment of the present application provides a washer-dryer, comprising: a shell; and a drying system arranged in the shell; the drying system comprises: an air duct, the air duct is connected to the inner drum of the washer-dryer; a fan and an air heating pipe are both arranged in the air duct, and are used to allow hot air in the air duct to enter the inner drum; a condenser is arranged on the rear wall of the inner drum, and is used to condense water vapor in the inner drum into water and discharge it from the bottom of the rear wall of the outer drum of the washer-dryer; the drying system also includes a return air temperature sensor arranged in the air duct, a return air temperature sensor arranged in the outer drum, and a return air temperature sensor arranged in the air duct. The water temperature sensor at the bottom of the rear wall of the drum, the return air temperature sensor and the water temperature sensor are electrically connected to the controller, and the controller is configured to perform the following steps: when receiving the start instruction of the drying program, obtaining the inertia value of the clothes in the inner drum, and obtaining the duct return air temperature collected by the return air temperature sensor and the water temperature collected by the water temperature sensor; according to the inertia value, determining the first stop parameter value and the second stop parameter value; according to the duct return air temperature, the water temperature, the first stop parameter value and the second stop parameter value, controlling the drying program to stop running.

[0007] In the above embodiment, the water temperature sensor is used to detect the water temperature at the bottom of the outer drum during the drying process, and a combined stop judgment method of the return air temperature sensor and the water temperature sensor is adopted. Compared with the stop judgment method using a single return air temperature sensor, the stop judgment method can significantly resist the interference caused by environmental changes, thereby effectively improving the accuracy of the drying stop judgment method.

[0008] In one embodiment of the present application, based on the aforementioned scheme, the controller is also configured to: determine whether the duct return air temperature reaches above the first stop judgment parameter value, and whether the difference between the duct return air temperature and the water temperature reaches above the second stop judgment parameter value; if the determination is yes, control the drying program to stop running.

[0009] In one embodiment of the present application, based on the aforementioned scheme, the controller is also configured to: determine the maximum drying time according to the inertia value; perform running timing of the drying program; control the drying program to stop running according to the duct return air temperature, the water temperature, the first stop judgment parameter value, the second stop judgment parameter value, the maximum drying time and the drying running timing duration.

[0010] In the above embodiment, the maximum drying time determined according to the inertia value is also determined, and a second stop judgment is performed according to the maximum drying time and the drying operation timing time. The drying program can be stopped more accurately through the two stop judgments.

[0011] In one embodiment of the present application, based on the aforementioned scheme, the controller is further configured to: determine whether the duct return air temperature reaches above the first stop judgment parameter value, and the difference between the duct return air temperature and the water temperature reaches above the second stop judgment parameter value; if the determination is no, determine whether the drying operation timing duration reaches above the maximum drying time; if the drying operation timing duration does not reach above the maximum drying time, control the drying program to continue running; if the drying operation timing duration reaches above the maximum drying time, control the drying program to stop running.

[0012] In one embodiment of the present application, based on the aforementioned scheme, the controller is also configured to: after the drying program stops running, switch the washer-dryer to run a cooling program; if the return air temperature sensor detects that the return air temperature of the air duct reaches below a preset temperature threshold, control the washer-dryer to stop running.

[0013] In the above embodiment, after the drying program stops running, it switches to running the cooling program to cool down the clothes that have just been dried, so that the clothes can be used immediately after cooling, thereby optimizing the user experience.

[0014] In one embodiment of the present application, based on the aforementioned scheme, the controller is further configured to: determine whether the inertia value reaches above a preset inertia threshold; if the determination is yes, determine the preset first value and second value as the first stop judgment parameter value and the second stop judgment parameter value respectively; if the determination is no, determine the preset third value and fourth value as the first stop judgment parameter value and the second stop judgment parameter value respectively, wherein the third value is smaller than the first value, and the fourth value is smaller than the second value.

[0015] In the above embodiment, according to the size of the clothing inertia value, by determining the size relationship between the clothing inertia value and the preset inertia threshold, the first stop judgment parameter and the second stop judgment parameter are further accurately determined, thereby achieving accurate control of stopping the drying program.

[0016] In one embodiment of the present application, based on the aforementioned solution, the controller is further configured to: when receiving an instruction to start a drying program, periodically collect the duct return air temperature and the water temperature at a preset time interval.

[0017] In the above embodiment, the return air temperature and water temperature of the air duct are periodically collected at preset time intervals, thereby reducing data management and storage costs, and reducing the wear and maintenance requirements of the return air temperature sensor and the water temperature sensor.

[0018] In one embodiment of the present application, based on the aforementioned scheme, the controller is further configured as follows: when the number of collection times of the duct return air temperature and the water temperature reaches above a number threshold, the collected duct return air temperature and water temperature are respectively averaged to calculate the average duct return air temperature and the average water temperature, and the average duct return air temperature and the average water temperature are used as the most recently collected target duct return air temperature and target water temperature; after reaching the number threshold, the duct return air temperature and water temperature collected each time are averaged with the target duct return air temperature and target water temperature collected last time to obtain the currently collected target duct return air temperature and target water temperature.

[0019] In the above embodiment, since the temperature sensor cannot accurately detect the temperature, the present application averages the target duct return air temperature and target water temperature collected last time, thereby accurately determining the currently collected target duct return air temperature and target water temperature; and adopts a rolling average method to correct the temperature fluctuations of the return air temperature sensor and the water temperature sensor during the drying process, thereby preventing the drying program from being misjudged to stop running due to abnormal temperature fluctuations.

[0020] In one embodiment of the present application, based on the aforementioned scheme, the drying system also includes: an outlet air temperature sensor, which is arranged at the air outlet of the air duct; the controller is also configured to: if the outlet air temperature sensor detects that the outlet air temperature of the air duct reaches above a preset temperature threshold, then turn off the air heating pipe and / or reduce the operating power of the air heating pipe; if the outlet air temperature sensor detects that the outlet air temperature of the air duct reaches below a preset temperature threshold, then turn on the air heating pipe and / or increase the operating power of the air heating pipe.

[0021] In the above embodiment, an air outlet temperature sensor is also provided to detect the air outlet temperature of the air duct. By comparing the air outlet temperature of the air duct with a preset temperature threshold, the operation of the air heating tube is controlled, thereby controlling the drying rate of the clothes according to the actual needs of the user.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 is a schematic diagram of a drying temperature curve provided by an exemplary embodiment of the present application;

[0025] Figure 2 is a two-dimensional structural schematic diagram of a washer-dryer provided by an exemplary embodiment of the present application;

[0026] Figure 3 is a rear view of a washer-dryer provided by an exemplary embodiment of the present application;

[0027] Figure 4 is a side view of a washer-dryer provided by an exemplary embodiment of the present application;

[0028] Figure 5 It is a determination flow chart for controlling the drying program to stop running provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0029] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0032] It should also be noted that the "multiple" mentioned in this application refers to two or more than two. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship.

[0033] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof 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 limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0034] Currently, the drying stop method of a washing and drying machine mainly uses a return air temperature sensor for single stop judgment. However, the temperature sensor cannot accurately detect the air temperature, and a single return air temperature sensor cannot flexibly adapt to changing usage environments. As a result, in high temperature environments in summer / hot areas, the return air temperature sensor is prone to failure in stopping.

[0035] The applicant has found through a large amount of experimental data that in the later stage of drying, as the degree of drying of the clothes in the inner drum increases, the heat exchange between the circulating air and the clothes continues to decrease, causing the return air temperature of the air duct (i.e., the temperature value detected by the return air temperature sensor) to gradually increase; and as the degree of drying of the clothes in the inner drum increases, the heat exchange between the circulating air and the cooling water also decreases, causing the water temperature at the bottom of the outer drum at the cooling water outlet (i.e., the temperature value detected by the water temperature sensor) to gradually decrease. The specific temperature changes during the drying process can be seen in Figure 1 . Figure 1 The horizontal axis shown in the figure represents the running time of the drying program, and the vertical axis represents the temperature; Tm represents the return air temperature of the air duct collected by the return air temperature sensor, and Tn represents the water temperature collected by the water temperature sensor.

[0036] Therefore, considering the changing characteristics of the return air temperature and water temperature during the drying process, the present application proposes a washer-dryer. Figure 2 FIG. 2 is a two-dimensional structural diagram of a washer-dryer provided by an exemplary embodiment of the present application. Figure 2 As shown, the washer-dryer 20 includes a housing 21, an air duct 22, a fan 23, an air heating pipe 24, a condenser 25, a return air temperature sensor 26, a water temperature sensor 27 and a controller. Each part of the washer-dryer 20 will be introduced one by one below.

[0037] The housing 21 is the external structure of the washer-dryer 20 and is used to fix and protect the internal components. The housing 21 is usually made of metal or plastic, and is usually provided with a control panel, operation buttons, a display screen, etc., which are used to trigger operation instructions and monitor the operating status of the washer-dryer 20.

[0038] The drying system is disposed in the housing 21 , and includes an air duct 22 , a fan 23 , an air heating pipe 24 , a condenser 25 , a return air temperature sensor 26 , and a water temperature sensor 27 .

[0039] The air duct 22 is connected to the inner drum of the washer-dryer 20, and transports the hot air heated by the air heating tube 24 to the inner drum. Usually, the air duct 22 is arranged between the inner drum and the outer drum of the washer-dryer 20 to ensure that the hot air can be evenly distributed to the clothes in the inner drum.

[0040] The fan 23 is disposed in the air duct 22 to help the hot air in the air duct 22 flow into the inner drum, so as to enhance the circulation of the hot air in the inner drum and ensure that the clothes in the inner drum are evenly heated and dried.

[0041] The air heating pipe 24 is disposed in the air duct 22 and is used to heat the air entering the air duct 22 to heat the air into hot air, so as to promote the evaporation of moisture in the clothes in the inner drum.

[0042] The condenser 25 is arranged on the rear wall of the inner drum, and is used to condense the water vapor in the inner drum into water and then discharge it from the bottom of the rear wall of the outer drum of the washer-dryer 20 through a drainage pump.

[0043] The return air temperature sensor 26 is disposed at the return air outlet of the air duct 22 to detect and collect the return air temperature of the air duct.

[0044] The water temperature sensor 27 is disposed at the bottom of the rear wall of the outer tub to detect and collect the temperature of the water discharged from the bottom of the rear wall of the outer tub.

[0045] The controller is electrically connected to the return air temperature sensor 26 and the water temperature sensor 27 respectively.

[0046] See also Figure 3 , Figure 3 FIG. 1 is a rear view of a washer-dryer provided by an exemplary embodiment of the present application. Figure 3 As shown, the water temperature sensor is located at the bottom of the rear wall of the outer drum of the washer-dryer; the return air temperature sensor is located at the top of the rear wall of the outer drum of the washer-dryer.

[0047] In another exemplary embodiment, the drying system further comprises:

[0048] The air outlet temperature sensor is located at the air outlet of the air duct;

[0049] The controller can be configured to perform the following steps:

[0050] If the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches above a preset temperature threshold, the air heating pipe is turned off and / or the operating power of the air heating pipe is reduced;

[0051] If the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches below a preset temperature threshold, the air heating pipe is turned on and / or the operating power of the air heating pipe is increased.

[0052] See also Figure 4 , Figure 4 FIG. 1 is a side view of a washer-dryer provided by an exemplary embodiment of the present application. Figure 4As shown, the air outlet temperature sensor is located at the top of the washer-dryer in the side view direction. If the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches above the preset temperature threshold, it indicates that the current operating power of the air heating pipe is too high, which leads to the air outlet temperature of the air duct being too high. Then, the air heating pipe is controlled to be turned off and / or the operating power of the air heating pipe is reduced, thereby reducing the air outlet temperature of the air duct; if the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches below the preset temperature threshold, it indicates that the current operating power of the air heating pipe is too low, thereby causing the air outlet temperature of the air duct to be too low. Then, the air heating pipe is controlled to be turned on and / or the operating power of the air heating pipe is increased, thereby increasing the air outlet temperature of the air duct. Among them, the preset temperature threshold is determined according to the actual needs of the user. If the user wants to dry quickly, a higher preset temperature threshold is set. If the user wants to dry slowly, a lower preset temperature threshold is set.

[0053] As can be seen from the above, this embodiment also provides an air outlet temperature sensor to detect the air outlet temperature of the air duct, and controls the operation of the air heating tube by comparing the size relationship between the air outlet temperature of the air duct and the preset temperature threshold, so as to control the drying rate of clothes according to the actual needs of the user.

[0054] The controller may also be configured to perform the following steps S220-S230:

[0055] S210, when a start instruction of a drying program is received, the inertia value of the clothes in the inner drum is obtained, as well as the return air temperature of the air duct collected by the return air temperature sensor and the water temperature collected by the water temperature sensor.

[0056] In S210, the start instruction of the drying program can be issued by the user through the control panel on the shell, and can also be issued by the user through a networked mobile terminal. The present application does not limit the method of issuing the start instruction of the drying program. When the controller receives the start instruction of the drying program, the clothes in the inner drum are weighed by the motor to obtain the weight of the clothes, and the inertia value of the clothes is obtained according to the proportional relationship between the weight value of the clothes and the inertia value of the clothes. That is, the larger the weight value of the clothes, the larger the inertia value of the clothes. It should be noted that the conversion formula between the weight value of the clothes and the inertia value of the clothes can be fitted according to the experimental data conducted in advance, so as to accurately determine the changing relationship between the inertia value of the clothes and the weight value of the clothes. When the washer-dryer receives the start instruction of the drying program, it also obtains the return air temperature of the air duct collected by the return air temperature sensor and the water temperature collected by the water temperature sensor.

[0057] In another exemplary embodiment, the controller may be further configured to perform the following steps:

[0058] When receiving the instruction to start the drying program, the return air temperature and water temperature of the air duct are periodically collected at a preset time interval;

[0059] When the number of times the duct return air temperature and water temperature are collected reaches or exceeds the number threshold, the collected duct return air temperature and water temperature are averaged to calculate the average duct return air temperature and average water temperature, and the average duct return air temperature and average water temperature are used as the most recently collected target duct return air temperature and target water temperature;

[0060] After reaching the number threshold, the duct return air temperature and water temperature collected each time are averaged with the target duct return air temperature and target water temperature collected last time to obtain the currently collected target duct return air temperature and target water temperature.

[0061] These steps are described in detail below.

[0062] When the controller receives an instruction to start the drying program, the duct return air temperature and water temperature are periodically collected at preset time intervals, for example, 1 second is used as a time period for temperature collection, or 2 seconds is used as a time period for temperature collection.

[0063] When the controller receives the instruction to start the drying program, the number of collections is accumulated. If it is detected that the number of collections of the duct return air temperature and water temperature reaches above the threshold, the collected duct return air temperature and water temperature are averaged respectively, and the average duct return air temperature and average water temperature are calculated, and the average duct return air temperature and average water temperature are used as the target duct return air temperature and target water temperature collected most recently.

[0064] Exemplarily, the preset number threshold is 140. When it is detected that the number of collections of the duct return air temperature Tm and the water temperature Tn reaches more than 140, the arithmetic mean of Tm1, Tm2, ​​Tm3...Tm140 is calculated as the average duct return air temperature, and the average duct return air temperature is used as the target duct return air temperature collected for the 140th time; similarly, the arithmetic mean of Tn1, Tn2, Tn3...Tn140 is calculated as the average water temperature, and the average water temperature is used as the target water temperature collected for the 140th time.

[0065] Furthermore, if the current number of times the duct return air temperature and water temperature are collected reaches the 141th time, the target duct return air temperature collected last time (i.e., the 140th time) and the currently collected duct return air temperature are averaged to obtain the currently collected target duct return air temperature; similarly, the target water temperature collected last time (i.e., the 140th time) and the currently collected water temperature are averaged to obtain the currently collected target water temperature. If the current number of times the duct return air temperature and water temperature are collected reaches the 142th time, the target duct return air temperature collected last time (i.e., the 141st time) and the currently collected duct return air temperature are averaged to obtain the currently collected target duct return air temperature; similarly, the target water temperature collected last time (i.e., the 141st time) and the currently collected water temperature are averaged to obtain the currently collected target water temperature.

[0066] From the above, it can be seen that the present embodiment further periodically collects the return air temperature and water temperature of the duct at preset time intervals, thereby reducing data management and storage costs, as well as reducing the wear and maintenance requirements of the return air temperature sensor and the water temperature sensor; and adopts a rolling average method to well correct the temperature fluctuations of the return air temperature sensor and the water temperature sensor during the drying process, thereby preventing the erroneous judgment that the drying program has stopped running due to abnormal temperature fluctuations.

[0067] S220, determining a first stop judgment parameter value and a second stop judgment parameter value according to the inertia value.

[0068] In S220, the first judgment stop parameter value is determined by the clothing inertia value and is used to determine the preset temperature limit value of the relationship between the return air temperature of the duct. The second judgment stop parameter is determined by the clothing inertia value and is used to determine the preset temperature limit value of the relationship between the return air temperature of the duct and the water temperature.

[0069] Furthermore, the method for determining the first stop judgment parameter value and the second stop judgment parameter value also includes the following steps:

[0070] Determine whether the inertia value reaches or exceeds a preset inertia threshold;

[0071] If the determination is yes, the preset first value and the second value are respectively determined as the first stop judgment parameter value and the second stop judgment parameter value;

[0072] If the determination is negative, the preset third value and fourth value are respectively determined as the first judgment stop parameter value and the second judgment stop parameter value, wherein the third value is smaller than the first value, and the fourth value is smaller than the second value.

[0073] Exemplarily, the corresponding relationship between the clothing inertia value and the first stop judgment parameter value and the second stop judgment parameter value may be shown in the following table:

[0074] Inertia value D The first judgment stop parameter value Tx The second judgment parameter value Ty D≤28 67 15 D＞28 69 19

[0075] In this embodiment, the preset inertia threshold is set to 28. If the clothing inertia value reaches or exceeds the preset inertia threshold (i.e., D>28), the preset first value 69 is used as the first judgment stop parameter value, and the preset second value 19 is used as the second judgment stop parameter value; if the clothing inertia value does not reach or exceed the preset inertia value (i.e., D≤28), the preset third value 67 is used as the first judgment stop parameter value, and the preset fourth value 15 is used as the second judgment stop parameter value. Among them, the third value 67 is less than the first value 69, and the fourth value 15 is less than the second value 19.

[0076] From the above, it can be seen that this embodiment further accurately determines the first stop judgment parameter and the second stop judgment parameter according to the size of the clothing inertia value by determining the size relationship between the clothing inertia value and the preset inertia threshold, thereby achieving accurate control of stopping the drying program.

[0077] S230, controlling the drying program to stop running according to the duct return air temperature, the water temperature, the first stop judgment parameter value and the second stop judgment parameter value.

[0078] In S230, the drying program is controlled to stop running according to the relationship between the return air temperature of the duct and the first stop parameter value, and the relationship between the difference between the return air temperature of the duct and the water temperature and the second stop parameter.

[0079] Specifically, it is determined whether the return air temperature of the duct reaches a first judgment stop parameter value or above, and whether the difference between the return air temperature of the duct and the water temperature reaches a second judgment stop parameter value or above; if the determination is yes, the drying program is controlled to stop running. Figure 1 As shown in the schematic diagram of the drying temperature curve, Tm in the figure represents the duct return air temperature, Tn represents the water temperature, Tm-Tn represents the difference between the duct return air temperature and the water temperature, and the first judgment stop parameter value and the second judgment stop parameter value are drawn as a curve parallel to the horizontal axis. The user can clearly know whether the duct return air temperature reaches above the first judgment stop parameter value at the current time point, and whether the difference between the duct return air temperature and the water temperature reaches above the second judgment stop parameter value.

[0080] In another exemplary embodiment, the controller may be further configured to perform the following steps:

[0081] According to the inertia value, determine the maximum drying time;

[0082] Perform the operation timing of the drying program;

[0083] Determine whether the duct return air temperature reaches or exceeds the first judgment stop parameter value, and whether the difference between the duct return air temperature and the water temperature reaches or exceeds the second judgment stop parameter value;

[0084] If the determination is no, determine whether the drying operation timing duration reaches or exceeds the maximum drying duration;

[0085] If the drying operation timing duration does not reach the maximum drying time, the drying program is controlled to continue running;

[0086] If the drying operation timing duration reaches or exceeds the maximum drying time, the drying program will be controlled to stop running.

[0087] These steps are described in detail below.

[0088] According to the clothing inertia value converted from the clothing weight value, the maximum drying time is determined. The maximum drying time is also proportional to the clothing inertia value, that is, the larger the clothing inertia value, the longer the maximum drying time. Drying timing is performed at the beginning of the drying program to obtain the drying operation timing time. After determining each judgment parameter, it is determined whether the return air temperature of the air duct reaches above the first judgment stop parameter value, and the difference between the return air temperature of the return air duct and the water temperature reaches above the second judgment stop parameter value. If it is determined otherwise, it is continued to determine whether the drying operation timing time reaches above the maximum drying time. If the drying operation timing time does not reach above the maximum drying time, the drying program is controlled to continue to run. If the drying operation timing time reaches above the maximum drying time, the drying program is controlled to stop running and switch to running the cooling program.

[0089] In another exemplary embodiment, the controller may be further configured to perform the following steps:

[0090] After the drying program stops running, switch the washer-dryer to the cooling program;

[0091] If the return air temperature sensor detects that the return air temperature in the air duct reaches below the preset temperature threshold, the washer-dryer is controlled to stop running.

[0092] When the drying program stops, the temperature of the clothes in the inner drum is still very high, and the user cannot use them directly after taking them out. Therefore, in this embodiment, after the drying program stops, the washer-dryer is switched to a cooling program to cool down the clothes that have just been dried. If the return air temperature sensor detects that the return air temperature of the air duct reaches below the preset temperature threshold, indicating that the temperature of the clothes in the inner drum has dropped to the normal temperature range, the drying is controlled and stopped, so that the user can take out the clothes and use them immediately, thereby optimizing the user experience.

[0093] See also Figure 5 , Figure 5This is a judgment flow chart for controlling the drying program to stop running provided by an exemplary embodiment of the present application. When a start command of the drying program is received, the weight of the clothes in the inner drum is obtained through the motor, and the weight of the clothes is converted into the inertia value of the clothes. At the same time, the return air temperature Tm and the water temperature Tn of the air duct are obtained through the return air temperature sensor and the water temperature sensor. The first judgment stop parameter value Tx, the second judgment stop parameter value Ty, the maximum drying time Tmax and the drying operation timing time T are determined according to the inertia value of the clothes. The drying operation timing time T is obtained by timing since the drying program starts running, thereby obtaining the drying operation timing time T. Then, it is determined whether the duct return air temperature Tm ≥ the first judgment stop parameter value Tx, and the difference Tm-Tn between the duct return air temperature Tm and the water temperature Tn ≥ the second judgment stop parameter value Ty. If it is determined to be yes, the drying program ends and switches to the cooling program; if it is determined to be no, it is further determined whether the drying operation timing time T ≥ the maximum drying time Tmax. If it is determined to be no, the drying program continues to run; if it is determined to be yes, the drying program ends and switches to the cooling program. After the cooling program ends, the washer-dryer is controlled to stop running.

[0094] As can be seen from the above, this embodiment adopts the method of jointly judging the stop of the return air temperature sensor and the water temperature sensor, which fully considers the influence of the ambient temperature and the cooling water temperature change. For example, in the summer, when the ambient temperature and water temperature are high, although the return air temperature sensor heats up quickly, the temperature of the water temperature sensor is also high, and the judgment stop condition Tm-Tn≥Ty will not be triggered in advance; and in the winter, when the ambient temperature and water temperature are low, although the temperature of the water temperature sensor is low and it is easy to reach the judgment stop condition Tm-Tn≥Ty, the temperature of the return air temperature sensor is also low, and the judgment stop condition Tm≥Tx will not be triggered in advance. It can be seen that the dual temperature sensor judgment stop method adopted in this embodiment is more accurate than the single return air temperature sensor judgment stop method.

[0095] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0096] It should be understood that the above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A washer-dryer, characterized in that: include: case; and a drying system disposed in the housing; The drying system comprises: an air duct, the air duct being in communication with an inner drum of the washer-dryer; The fan and the air heating pipe are both arranged in the air duct and are used to allow the hot air in the air duct to enter the inner cylinder; A condenser, arranged on the rear wall of the inner drum, for condensing the water vapor in the inner drum into water and then discharging it from the bottom of the rear wall of the outer drum of the washer-dryer; The drying system further includes a return air temperature sensor disposed in the air duct and a water temperature sensor disposed at the bottom of the rear wall of the outer drum, wherein the return air temperature sensor and the water temperature sensor are both electrically connected to a controller, and the controller is configured to perform the following steps: When a start instruction of a drying program is received, the inertia value of the clothes in the inner drum is obtained, and the return air temperature of the air duct collected by the return air temperature sensor and the water temperature collected by the water temperature sensor are obtained; Determining a first stop judgment parameter value and a second stop judgment parameter value according to the inertia value; The drying program is controlled to stop running according to the duct return air temperature, the water temperature, the first stop judgment parameter value and the second stop judgment parameter value.

2. The washer-dryer according to claim 1, characterized in that: The controller is also configured to: Determine whether the duct return air temperature reaches or exceeds the first judgment stop parameter value, and whether the difference between the duct return air temperature and the water temperature reaches or exceeds the second judgment stop parameter value; If the determination is yes, the drying program is controlled to stop running.

3. The washer-dryer according to claim 1, characterized in that: The controller is also configured to: Determining a maximum drying time according to the inertia value; Performing operation timing of the drying program; The drying program is controlled to stop running according to the duct return air temperature, the water temperature, the first stop judgment parameter value, the second stop judgment parameter value, the maximum drying time and the drying operation timing time.

4. The washer-dryer according to claim 3, characterized in that: The controller is also configured to: Determine whether the duct return air temperature reaches or exceeds the first judgment stop parameter value, and whether the difference between the duct return air temperature and the water temperature reaches or exceeds the second judgment stop parameter value; If the determination is no, determining whether the drying operation timing duration reaches or exceeds the maximum drying duration; If the drying operation timing duration does not reach the maximum drying time, the drying program is controlled to continue running; If the drying operation timing duration reaches or exceeds the maximum drying time duration, the drying program is controlled to stop running.

5. The washer-dryer according to claim 1, characterized in that: The controller is also configured to: After the drying program stops running, switching the washer-dryer to run a cooling program; If the return air temperature sensor detects that the return air temperature of the air duct reaches below a preset temperature threshold, the washer-dryer is controlled to stop running.

6. The washer-dryer according to claim 1, characterized in that: The controller is also configured to: Determining whether the inertia value reaches or exceeds a preset inertia threshold; If the determination is yes, the preset first value and the second value are respectively determined as the first stop judgment parameter value and the second stop judgment parameter value; If the determination is negative, the preset third value and fourth value are respectively determined as the first judgment stop parameter value and the second judgment stop parameter value, wherein the third value is smaller than the first value, and the fourth value is smaller than the second value.

7. The washer-dryer according to claim 1, characterized in that: The controller is also configured to: When an instruction to start a drying program is received, the return air temperature of the air duct and the water temperature are periodically collected with a preset time period as the time interval.

8. The washer-dryer according to claim 7, characterized in that: The controller is also configured to: When the number of times the duct return air temperature and the water temperature are collected reaches or exceeds the number threshold, the collected duct return air temperature and water temperature are averaged to calculate the average duct return air temperature and the average water temperature, and the average duct return air temperature and the average water temperature are used as the most recently collected target duct return air temperature and the target water temperature; After reaching the number threshold, the duct return air temperature and water temperature collected each time are averaged with the target duct return air temperature and target water temperature collected last time to obtain the currently collected target duct return air temperature and target water temperature.

9. The washer-dryer according to claim 1, characterized in that: The drying system also includes: An air outlet temperature sensor is arranged at the air outlet of the air duct; The controller is also configured to: If the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches above a preset temperature threshold, the air heating pipe is turned off and / or the operating power of the air heating pipe is reduced; If the air outlet temperature sensor detects that the air outlet temperature of the air duct reaches below a preset temperature threshold, the air heating pipe is turned on and / or the operating power of the air heating pipe is increased.

Images