Washing and drying integrated machine

Abstract

Embodiments of the present application provide a washing and drying integrated machine, comprising: a shell; and a drying system 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; a controller electrically connected with the return air temperature sensor and the water temperature sensor, the controller is configured to perform the following steps: when receiving a start instruction of a drying program, obtaining an inertia value of clothes in the inner drum, and obtaining an air duct return air temperature collected by the return air temperature sensor and a water temperature collected by the water temperature sensor; determining a first stop parameter value and a second stop parameter value according to the inertia value; controlling the drying program to stop running according to the air duct return air temperature, the water temperature, the first stop parameter value and the second stop parameter value. The present application can accurately control the drying program to stop running.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing and drying integrated machines, and particularly relates to a washing and drying integrated machine. BACKGROUND

[0002] The washing and drying integrated machine is a machine integrating two functions (washing and drying) for washing clothes, which can effectively shorten the time for washing and drying. For users, if the clothes are still wet (i.e., not dried) after the drying program of the washing and drying integrated machine stops running, it will be not conducive to wearing / storage; if the clothes are over-dried (i.e., over-dried) after the drying program of the washing and drying integrated machine stops running, it is extremely likely to cause damage to the material of the clothes. Therefore, how to accurately control the drying program to stop running is of great significance to users.

[0003] At present, the drying stop mode of the washing and drying integrated machine mainly adopts a single stop by using a return air temperature sensor. However, the temperature sensor cannot accurately detect the air temperature, and the single return air temperature sensor cannot flexibly adapt to the changing use environment, resulting in that in the high-temperature environment of summer / heat areas, the return air temperature sensor is prone to stop failure.

[0004] Therefore, there is an urgent need for a washing and drying integrated machine capable of accurately controlling the drying program to stop running. SUMMARY

[0005] To solve the above technical problems, the embodiments of the present application provide a washing and drying integrated machine.

[0006] According to one aspect of the embodiments of the present application, the embodiments of the present application provide a washing and drying integrated machine, comprising: a shell; and a drying system arranged in the shell; the drying system comprises: an air duct, which is in communication with an inner drum of the washing and drying integrated machine; a fan and an air heating pipe, both of which are arranged in the air duct, for making hot air in the air duct enter the inner drum; a condenser arranged at a rear wall of the inner drum, for condensing water vapor in the inner drum into water and then discharging the water from a bottom of a rear wall of an outer drum of the washing and drying integrated machine; the drying system further comprises a return air temperature sensor arranged in the air duct and a water temperature sensor arranged at the bottom of the rear wall of the outer drum, the return air temperature sensor and the water temperature sensor are both electrically connected with a controller, and the controller is configured to perform the following steps: when receiving a starting instruction of a drying program, obtaining an inertia value of clothes in the inner drum, and obtaining an air duct return air temperature collected by the return air temperature sensor and a water temperature collected by the water temperature sensor; determining a first stop parameter value and a second stop parameter value according to the inertia value; and controlling the drying program to stop running according to the air duct return air temperature, the water temperature, the first stop parameter value and the second stop parameter value.

[0007] In the above embodiment, the water temperature sensor is used to detect the temperature of the rear bottom of the outer cylinder during the drying process, and the return air temperature sensor and the water temperature sensor are combined to determine the stopping of the drying process. Compared with the single return air temperature sensor, the interference caused by the change of the environment can be significantly resisted, and the accuracy of the drying stopping can be effectively improved.

[0008] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to determine whether the return air temperature of the air duct reaches the first stopping parameter value and the difference between the return air temperature of the air duct and the water temperature reaches the second stopping parameter value, and control the drying program to stop running if the determination is yes.

[0009] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to determine the maximum drying time according to the inertia value, count the running time of the drying program, and control the drying program to stop running according to the return air temperature of the air duct, the water temperature, the first stopping parameter value, the second stopping parameter value, the maximum drying time, and the drying running time.

[0010] In the above embodiment, the maximum drying time determined according to the inertia value is also determined, and the second stopping is performed according to the maximum drying time and the drying running time, so that the drying program can be more accurately controlled to stop running through two stoppings.

[0011] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to determine whether the return air temperature of the air duct reaches the first stopping parameter value and the difference between the return air temperature of the air duct and the water temperature reaches the second stopping parameter value, and control the drying program to stop running if the determination is yes.

[0012] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to switch the washing and drying integrated machine to run a cooling program after the drying program stops running, and control the washing and drying integrated machine to stop running if the return air temperature sensor detects that the return air temperature of the air duct reaches a preset temperature threshold.

[0013] In the above embodiment, after the drying program stops running, the cooling program is switched to run to cool the clothes just dried, so that the clothes can be used immediately after cooling, and the user experience is optimized.

[0014] In an embodiment of the present application, based on the foregoing scheme, the controller is further configured to: determine whether the inertia value is above a preset inertia threshold value; if the determination is yes, determine preset first and second values as the first and second stop judging parameter values respectively; and if the determination is no, determine preset third and fourth values as the first and second stop judging parameter values respectively, wherein the third value is less than the first value, and the fourth value is less 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 value, the first and second stop judging parameters are further accurately determined, so as to accurately control the drying program to stop running.

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

[0017] In the above embodiment, the air duct return air temperature and the water temperature are periodically collected at a preset time interval, thereby reducing the 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 an embodiment of the present application, based on the foregoing scheme, the controller is further configured to: when the collection times of the air duct return air temperature and the water temperature reach a times threshold value, average the collected air duct return air temperature and water temperature respectively to obtain an average air duct return air temperature and an average water temperature, and take the average air duct return air temperature and the average water temperature as target air duct return air temperature and target water temperature collected last time; and after reaching the times threshold value, average the air duct return air temperature and the water temperature collected each time with the target air duct return air temperature and the target water temperature collected last time to obtain target air duct return air temperature and target water temperature collected currently.

[0019] In the above embodiment, since the temperature sensor cannot accurately detect the temperature, the present application averages the target air duct return air temperature and the target water temperature collected last time to accurately obtain the target air duct return air temperature and the target water temperature collected currently; and adopts a rolling average method to well correct the temperature fluctuation of the return air temperature sensor and the water temperature sensor in the drying process, thereby preventing false judgment of stopping the drying program due to abnormal temperature fluctuation.

[0020] In one embodiment of the present application, based on the foregoing scheme, the drying system further comprises an air outlet temperature sensor arranged at an air outlet of the air duct; the controller is further configured to: if the air outlet temperature sensor detects that the air duct outlet temperature is above a preset temperature threshold, turn off the air heating pipe and / or reduce the operating power of the air heating pipe; if the air outlet temperature sensor detects that the air duct outlet temperature is below the preset temperature threshold, 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 further arranged to detect the air duct outlet temperature, and the operation of the air heating pipe is controlled by comparing the size relationship between the air duct outlet temperature and the preset temperature threshold, so that the drying rate of the clothes can be controlled according to the actual needs of the user.

[0022] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. It is clear that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without creative labor on the basis of these drawings. In the drawings:

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

[0025] Figure 2 is a two-dimensional structural diagram of a washing and drying integrated machine provided by an exemplary embodiment of the present application;

[0026] Figure 3 is a rear view of a washing and drying integrated machine provided by an exemplary embodiment of the present application;

[0027] Figure 4 is a side view of a washing and drying integrated machine provided by an exemplary embodiment of the present application;

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

[0029] Detailed description will be given below to the exemplary embodiments, examples of which are shown in the drawings. In the following description, same numbers in different drawings represent same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they only represent examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

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

[0031] The flowcharts shown in the drawings are merely exemplary illustrations, and do not necessarily include all contents and operations / steps, nor do they have to be executed in the described order. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so that the actual execution order can be changed according to actual situations.

[0032] It is also to be noted that "multiple" as mentioned in the present application means two or more. The association relationship of "and / or" describes the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0033] The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not intended to describe a particular order. The terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0034] At present, the drying judgment stop mode of the washing and drying integrated machine mainly adopts a single judgment stop by using a return air temperature sensor. However, the temperature sensor cannot accurately detect the air temperature, and the single return air temperature sensor cannot flexibly adapt to the changeable use environment, resulting in that in the high temperature environment of summer / semi-hot areas, the return air temperature sensor judgment stop failure is prone to occur.

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

[0036] Therefore, considering the change characteristics of the air duct return air temperature and the water temperature in the drying process, the present application provides a washer-dryer, Figure 2 which is a two-dimensional structural schematic diagram of the washer-dryer provided by an exemplary embodiment of the present application. As shown in the figure, Figure 2 the washer-dryer 20 comprises a shell 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. The parts in the washer-dryer 20 will be introduced one by one below.

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

[0038] The drying system is arranged in the shell 21, which comprises the air duct 22, the fan 23, the air heating pipe 24, the condenser 25, the return air temperature sensor 26 and the water temperature sensor 27.

[0039] The air duct 22 communicates with the inner drum of the washer-dryer 20, and transports the hot air heated by the air heating pipe 24 into the inner drum. Usually, the air duct 22 is arranged between the inner drum and the outer drum of the washer-dryer 20, so as to ensure that the hot air can be uniformly distributed to the clothes in the inner drum.

[0040] The fan 23 is arranged in the air duct 22, which is used 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 uniformly heated and dried.

[0041] The air heating pipe 24 is arranged in the air duct 22, which is used to heat the air entering the air duct 22, so that the air is heated into hot air, so as to promote the evaporation of water 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, which is then discharged from the bottom of the rear wall of the outer drum of the washer-dryer 20 by a water pump.

[0043] The return air temperature sensor 26 is arranged at the return air inlet of the air duct 22, and is used to detect and collect the return air temperature of the air duct.

[0044] The water temperature sensor 27 is arranged at the bottom of the rear wall of the outer drum, and is used to detect and collect the temperature of the water discharged from the bottom of the rear wall of the outer drum.

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

[0046] Please refer to Figure 3 , Figure 3 is a rear view of the washer-dryer according to an example embodiment of the present application. As shown in Figure 3 , the water temperature sensor is arranged at the bottom of the rear wall of the outer drum of the washer-dryer, and the return air temperature sensor is arranged at the top of the rear wall of the outer drum of the washer-dryer.

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

[0048] An outlet air temperature sensor is arranged at the outlet of the air duct.

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

[0050] If the outlet air temperature sensor detects that the outlet air 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 outlet air temperature sensor detects that the outlet air 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] Please refer to Figure 4 , Figure 4 is a side view of the washer-dryer according to an example embodiment of the present application. As shown in Figure 4As shown, the air outlet temperature sensor is located at the top of the washing-drying integrated machine in the side view direction. If the air outlet temperature sensor detects that the air duct outlet temperature reaches above the preset temperature threshold, indicating that the current air heating pipe operating power is too high, thereby causing the air duct outlet temperature to be too high, the control turns off the air heating pipe and / or reduces the operating power of the air heating pipe, thereby reducing the air duct outlet temperature. If the air outlet temperature sensor detects that the air duct outlet temperature reaches below the preset temperature threshold, indicating that the current air heating pipe operating power is too low, thereby causing the air duct outlet temperature to be too low, the control turns on the air heating pipe and / or increases the operating power of the air heating pipe, thereby increasing the air duct outlet temperature. 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, the embodiment further provides an air outlet temperature sensor to detect the air duct outlet temperature, and the operation of the air heating pipe is controlled by comparing the size relationship between the air duct outlet temperature and the preset temperature threshold, so that the drying rate of the clothes can be controlled according to the actual needs of the user.

[0054] The controller can also be configured to perform the steps shown in S220-S230 as follows:

[0055] S210, when receiving the start instruction of the drying program, obtaining the inertia value of the clothes in the inner drum, and obtaining the air duct return air temperature 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 operating the control panel on the shell, or by the user through the connected mobile terminal. The application does not limit the way the start instruction of the drying program is issued. When the controller receives the start instruction of the drying program, the weight of the clothes is obtained by weighing the clothes in the inner drum by the motor, 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, i.e. the greater the weight value of the clothes, the greater 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 obtained according to the experimental data fitted in advance, so as to accurately obtain the change relationship between the inertia value of the clothes and the weight value of the clothes. At the same time that the washing-drying integrated machine receives the start instruction of the drying program, the air duct return air temperature collected by the return air temperature sensor and the water temperature collected by the water temperature sensor are also obtained.

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

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

[0059] When the number of times of collecting the air duct return air temperature and the water temperature reaches more than the number threshold, the collected air duct return air temperature and the water temperature are respectively averaged to obtain an average air duct return air temperature and an average water temperature, and the average air duct return air temperature and the average water temperature are taken as the target air duct return air temperature and the target water temperature collected last time.

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

[0061] The steps are described in detail as follows.

[0062] When the controller receives an instruction to start the drying program, the air duct return air temperature and the water temperature are periodically collected with a preset time period as a time interval, for example, the temperature is collected with 1s as a time period or the temperature is collected with 2s as a time period.

[0063] The number of times of collecting is accumulated since the controller receives the instruction to start the drying program, and if it is detected that the number of times of collecting the air duct return air temperature and the water temperature reaches more than the number threshold, the collected air duct return air temperature and the water temperature are respectively averaged to obtain an average air duct return air temperature and an average water temperature, and the average air duct return air temperature and the average water temperature are taken as the target air duct return air temperature and the target water temperature collected last time.

[0064] For example, the preset number threshold is 140, and when it is detected that the number of times of collecting the air 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 an average air duct return air temperature, and the average air duct return air temperature is taken as the target air duct return air temperature collected at the 140th time. Similarly, the arithmetic mean of Tn1, Tn2, Tn3,..., Tn140 is calculated as an average water temperature, and the average water temperature is taken as the target water temperature collected at the 140th time.

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

[0066] As can be seen from the above, the embodiment further uses the preset time period as the time interval to periodically collect the air duct return air temperature and the water temperature, thereby reducing the data management and storage costs, and reducing the wear and maintenance requirements of the return air temperature sensor and the water temperature sensor; and the rolling average method is used to well correct the temperature fluctuation of the return air temperature sensor and the water temperature sensor in the drying process, thereby preventing false judgment of the drying program stop running due to abnormal temperature fluctuation.

[0067] In S220, the first stop parameter value is determined by the inertia value, and is a preset temperature limit value for determining the size relationship with the air duct return air temperature. The second stop parameter is determined by the inertia value, and is a preset temperature limit value for determining the size relationship between the difference value of the air duct return air temperature and the water temperature.

[0068] In S220, the first stop parameter value is determined by the inertia value, and is a preset temperature limit value for determining the size relationship with the air duct return air temperature. The second stop parameter is determined by the inertia value, and is a preset temperature limit value for determining the size relationship between the difference value of the air duct return air temperature and the water temperature.

[0069] Further, the method for determining the first stop parameter value and the second stop parameter value further includes the following steps:

[0070] Determine whether the inertia value is above the preset inertia threshold value;

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

[0072] If it is determined that no, the preset third value and the fourth value are determined as the first stop parameter value and the second stop parameter value, respectively, wherein the third value is less than the first value, and the fourth value is less than the second value.

[0073] For example, the corresponding relationship between the inertia value of the clothes and the first stop parameter value and the second stop parameter value can be as shown in the following table:

[0074] Inertial value D First stop criterion value Tx Second stop criterion value Ty D≤28 67 15 D＞28 69 19

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

[0076] As can be seen from the above, this embodiment determines the first stop parameter and the second stop parameter by judging the relationship between the clothing inertia value and the preset inertia threshold, based on the magnitude of the clothing inertia value, thereby achieving precise control of the drying program to stop running.

[0077] S230 controls the drying program to stop running based on the return air temperature of the air duct, the water temperature, the first stop parameter value, and the second stop parameter value.

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

[0079] Specifically, it determines whether the duct return air temperature reaches or exceeds the first stop parameter value, and whether the difference between the duct return air temperature and the water temperature reaches or exceeds the second stop parameter value; if so, the drying program is stopped. Figure 1 The diagram shows a drying temperature curve. In the diagram, Tm represents the duct return air temperature, Tn represents the water temperature, and Tm-Tn represents the difference between the duct return air temperature and the water temperature. By plotting the first and second stop parameter values ​​parallel to the horizontal axis, the user can clearly know whether the duct return air temperature has reached or exceeded the first stop parameter value at the current time point, and whether the difference between the duct return air temperature and the water temperature has reached or exceeded the second stop parameter value.

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

[0081] Determine the maximum drying time based on the inertia value;

[0082] Start timing the drying process;

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

[0084] If the determination is negative, it is determined whether the drying operation timing duration has reached above the maximum drying duration;

[0085] If the drying operation timing duration has not reached above the maximum drying duration, the drying program is controlled to continue running;

[0086] If the drying operation timing duration has reached above the maximum drying duration, the drying program is controlled to stop running.

[0087] The steps are described in detail as follows.

[0088] According to the laundry inertia value converted from the laundry weight value, the maximum drying duration is determined, which is also proportional to the laundry inertia value, i.e., the greater the laundry inertia value, the greater the maximum drying duration. The drying timing is started at the beginning of the drying program running, and the drying operation timing duration is obtained. After the determination of the respective determination parameters, it is determined whether the air duct return air temperature has reached above the first determination stop parameter value and the difference between the air duct return air temperature and the water temperature has reached above the second determination stop parameter value. If the determination is negative, it is determined whether the drying operation timing duration has reached above the maximum drying duration. If the drying operation timing duration has not reached above the maximum drying duration, the drying program is controlled to continue running. If the drying operation timing duration has reached above the maximum drying duration, the drying program is controlled to stop running and switch to running the cooling program.

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

[0090] After the drying program stops running, the washing-drying integrated machine is switched to running the cooling program;

[0091] If the return air temperature sensor detects that the air duct return air temperature has reached below the preset temperature threshold, the washing-drying integrated machine is controlled to stop running.

[0092] When the drying program stops running, the temperature of the laundry in the inner drum is still high, and the user cannot directly use it after taking it out. Therefore, in this embodiment, after the drying program stops running, the washing-drying integrated machine is switched to running the cooling program to cool the just-dried laundry. If the return air temperature sensor detects that the air duct return air temperature has reached below the preset temperature threshold, it indicates that the temperature of the laundry in the inner drum has dropped to the normal temperature range, and the drying and stopping are controlled, so that the user can immediately use the laundry after taking it out, thereby optimizing the user's use experience.

[0093] Please refer to Figure 5 , Figure 5The control flow chart for stopping the drying program is provided by the exemplary embodiment of the present application. When the start instruction of the drying program is received, the weight of the clothes in the inner drum is obtained by 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 are obtained by the return air temperature sensor and the water temperature sensor, the first stop parameter value Tx, the second stop parameter value Ty, the maximum drying time Tmax and the drying running time T are determined according to the inertia value of the clothes, the drying running time T is counted from the start of the drying program, thereby obtaining the drying running time T. Then, it is determined whether the return air temperature Tm≥the first stop parameter value Tx, and the difference Tm-Tn between the return air temperature Tm and the water temperature Tn≥the second stop parameter value Ty, if yes, the drying program is ended and the cooling program is run; if no, it is determined whether the drying running time T≥the maximum drying time Tmax, if no, the drying program continues to run, if yes, the drying program is ended and the cooling program is run. When the cooling program is run, the washing and drying integrated machine is stopped.

[0094] As can be seen from the above, the embodiment adopts the joint stopping mode of the return air temperature sensor and the water temperature sensor, fully considers the influence of the change of the ambient temperature and the cooling water temperature, for example, in the case of high ambient temperature and high water temperature in summer, although the return air temperature sensor is heated up faster, but the temperature of the water temperature sensor is also higher, so the stopping condition Tm-Tn≥Ty is not triggered in advance; while in the case of low ambient temperature and low water temperature in winter, although the temperature of the water temperature sensor is lower, the stopping condition Tm-Tn≥Ty is easily reached, but the temperature of the return air temperature sensor is also lower, so the stopping condition Tm≥Tx is not triggered in advance. It can be seen that the double temperature sensor stopping mode adopted by the embodiment has higher accuracy than the single return air temperature sensor stopping mode.

[0095] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the present application encompass all technological equivalents of the disclosed technology that come within the scope of the claims.

[0096] It should be understood that the above description is only the preferred exemplary embodiment of the present application, and is not intended to limit the implementation of the present application, and those skilled in the art can easily make corresponding changes or modifications according to the main idea and spirit of the present application, therefore the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. A washer-dryer, characterized in that, The washing and drying machine comprises: a housing; a drying system arranged in the housing; the drying system comprises: an air duct in communication with an inner drum of the washing and drying machine; a fan and an air heating pipe arranged in the air duct, for making hot air in the air duct enter the inner drum; a condenser arranged at a rear wall of the inner drum, for condensing water vapor in the inner drum into water and discharging the water from a bottom of a rear wall of an outer drum of the washing and drying machine; the drying system further comprises a return air temperature sensor arranged in the air duct and a water temperature sensor arranged at the bottom of the rear wall of the outer drum, the return air temperature sensor and the water temperature sensor are electrically connected with a controller, and the controller is configured to perform the following steps: when receiving a start instruction of a drying program, obtaining an inertia value of clothes in the inner drum, and obtaining an air duct return air temperature collected by the return air temperature sensor and a water temperature collected by the water temperature sensor; when the collection times of the air duct return air temperature and the water temperature reach a threshold value, performing average processing on the collected air duct return air temperature and water temperature respectively, calculating an average air duct return air temperature and an average water temperature, and taking the average air duct return air temperature and the average water temperature as target air duct return air temperature and target water temperature collected in the last time; after reaching the threshold value, performing average processing on the air duct return air temperature and the water temperature collected each time and the target air duct return air temperature and the target water temperature collected in the last time to obtain target air duct return air temperature and target water temperature collected in the current time; determining a first stop parameter value and a second stop parameter value according to the inertia value; controlling the drying program to stop running according to the air duct return air temperature, the water temperature, the first stop parameter value, and the second stop parameter value; determining whether the air duct return air temperature reaches the first stop parameter value and the difference between the air duct return air temperature and the water temperature reaches the second stop parameter value; if the determination is yes, controlling the drying program to stop running.

2. The washer-dryer according to claim 1, characterized in that, The controller is further configured to: determine a maximum drying time according to the inertia value; count the running time of the drying program; control the drying program to stop running according to the air duct return air temperature, the water temperature, the first stop parameter value, the second stop parameter value, the maximum drying time, and the drying running time.

3. The washer-dryer according to claim 2, characterized in that, The controller is further configured to: determine whether the air duct return air temperature reaches the first stop parameter value and the difference between the air duct return air temperature and the water temperature reaches the second stop parameter value; if the determination is no, determine whether the drying running time reaches the maximum drying time; if the drying running time does not reach the maximum drying time, control the drying program to continue running; if the drying running time reaches the maximum drying time, control the drying program to stop running.

4. The washer-dryer according to claim 1, characterized in that, The controller is further configured to: after the drying program stops running, switch the washing and drying machine to run a cooling program. If the return air temperature sensor detects that the air duct return air temperature reaches below a preset temperature threshold, the controller controls the washer-dryer to stop running.

5. The washer-dryer according to claim 1, characterized in that, The controller is further configured to: determine whether the inertia value reaches above a preset inertia threshold; if yes, determine a preset first value and a preset second value as the first stop parameter value and the second stop parameter value, respectively; if no, determine a preset third value and a preset fourth value as the first stop parameter value and the second stop parameter value, respectively, wherein the third value is less than the first value, and the fourth value is less than the second value.

6. The washer-dryer according to claim 1, characterized in that, The controller is further configured to: when receiving an instruction to start a drying program, periodically collect the air duct return air temperature and the water temperature with a preset time period as a time interval.

7. The washer-dryer according to claim 1, characterized in that, The drying system further comprises: an outlet air temperature sensor arranged at an air outlet of the air duct; The controller is further configured to: if the outlet air temperature sensor detects that the air duct outlet air temperature reaches above a preset temperature threshold, 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 air duct outlet air temperature reaches below a preset temperature threshold, turn on the air heating pipe and / or increase the operating power of the air heating pipe.

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