Method, controller and equipment for judging dryness of laundry

Abstract

The present application relates to the field of laundry processing, and more specifically, to a laundry drying and dryness determination method, controller, and device. The method is applied to a drying system including an air inlet, a first vent position, and a second vent position. The method includes obtaining the temperature of the airflow at the first vent position and the second vent position in response to a dryness determination signal; and determining whether to end the drying and dryness determination phase based on the temperature difference of the airflow at the first vent position and the second vent position. Since condensation affects the temperature of the drying airflow, and the different dryness of the laundry has different effects on the temperature of the drying airflow during the condensation process, the temperature difference of the airflow at the first vent position and the second vent position can reflect the condensation of the drying airflow. Therefore, it is possible to determine whether to end the drying and dryness determination phase based on the condensation condition, thereby achieving accurate dryness determination of the laundry.

Description

Technical Field

[0001] The present application relates to the field of laundry processing, and in particular to a laundry drying and dryness determination method, controller, and equipment. Background Art

[0002] In recent years, demand for laundry processing equipment, such as washing and drying machines, has grown significantly. These machines are also becoming increasingly versatile, with most integrating water intake, washing, and drying functions. However, current laundry processing equipment often exhibits significant errors in determining whether laundry has been dried, which degrades the user experience. Summary of the Invention

[0003] The present application provides a method, controller and device for judging whether laundry is dry, so as to at least solve the technical problem of low accuracy in judging whether laundry is dry.

[0004] According to a first aspect of an embodiment of the present application, a method for determining whether laundry is dry is provided, which is applied to a drying system, the drying system comprising an inner drum and an outer drum, a drying duct formed between the inner and outer drums, the drying duct comprising a first drying duct and a second drying duct, the first drying duct being provided with an air inlet communicating with the inner drum and an air outlet communicating with the outer drum, the second drying duct comprising a first condensation zone disposed between an outer side of a bottom wall of the inner drum and an inner side of a bottom wall of the outer drum, and a second condensation zone disposed on an outer side of the bottom wall of the outer drum; a first vent and a second vent being formed in the bottom wall of the outer drum, the flow area of ​​the first vent being larger than the flow area of ​​the second vent, the first vent being configured to deliver a first airflow in the outer drum into a lower portion of the second condensation zone, and the second vent being configured to deliver a second airflow condensed in the first condensation zone into an upper portion of the second condensation zone, the outlet being configured to communicate with the second condensation zone and being located between the first and second vents and proximate to the second vent, the first airflow and the second airflow flowing from the outlet into the first drying duct, the method comprising:

[0005] In response to the dryness determination signal, respectively acquiring the airflow temperature of the second condensation zone at the first vent position and the second vent position;

[0006] Whether to end the drying and drying stage is determined according to the difference between the air flow temperature of the second condensation zone at the first vent position and the air flow temperature at the second vent position.

[0007] Optionally, the determining whether to end the drying and drying stage according to the difference between the air flow temperature of the second condensation zone at the first vent position and the air flow temperature at the second vent position includes:

[0008] When the difference between the first temperature of the airflow at the first vent position and the second temperature of the airflow at the second vent position meets the preset drying condition, it is determined that the drying and drying stage is ended.

[0009] Optionally, the method further includes:

[0010] When the absolute value of the difference between the first temperature and the second temperature is greater than the preset dryness judgment temperature threshold, it is determined that the difference meets the dryness judgment condition, or

[0011] When the absolute value of the difference between the first temperature and the second temperature is greater than a preset dry temperature threshold and the number of times the difference is greater than the dry temperature threshold exceeds a preset number threshold, it is determined that the difference meets the dry condition.

[0012] Optionally, the drying temperature threshold and the number threshold are changed according to the weight of the laundry to be dried in the drying system.

[0013] Optionally, the first drying air duct of the drying system is provided with a heating module for heating the drying airflow in the drying system, and the method further comprises:

[0014] Obtaining the inlet temperature of the airflow at the air inlet;

[0015] Proportional-integral-differential control is used to adjust electrical parameters of the heating module in the drying system according to the inlet air temperature and a preset inlet air temperature threshold, so as to control the inlet air temperature within the inlet air temperature threshold.

[0016] Optionally, the adjusting the electrical parameters of the heating module in the drying system by using proportional-integral-differential control according to the inlet air temperature and a preset inlet air temperature threshold comprises:

[0017] Calculate the proportional part of the heating module output power change U1 according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U1=Kp*(T0-T), Kp is the proportional coefficient;

[0018] Calculate the integral control quantity U2 according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U2=Ki*∫(T0-T), Ki is the integral coefficient, and ∫ represents the cumulative sum of the errors;

[0019] The differential control variable U3 is calculated according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U3=Kd*(dT / dt), and Kd is the integral coefficient.

[0020] Optionally, after obtaining the inlet temperature of the airflow at the air inlet, the method further includes:

[0021] When the inlet air temperature is lower than the lower limit of the inlet air temperature threshold, controlling the heating module to turn on;

[0022] When the inlet air temperature is greater than the upper limit of the inlet air temperature threshold, controlling the heating module to be turned off, and determining whether the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time;

[0023] If the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time, the dryness determination signal is responded to.

[0024] According to a second aspect of an embodiment of the present application, a laundry processing device is provided, which includes an inner drum and an outer drum, a drying air duct formed between the inner drum and the outer drum, the drying air duct including a first drying air duct and a second drying air duct, the first drying air duct being provided with an air inlet communicating with the inner drum and an air outlet communicating with the outer drum, the second drying air duct comprising a first condensation zone arranged between the outer side of the bottom wall of the inner drum and the inner side of the bottom wall of the outer drum, and a second condensation zone arranged outside the bottom wall of the outer drum; a first ventilation opening and a second ventilation opening are opened on the bottom wall of the outer drum, the flow area of ​​the first ventilation opening being larger than the flow area of ​​the second ventilation opening, the first ventilation opening being used to send a first airflow in the outer drum into a lower part of the second condensation zone, and the second ventilation opening being used to send a second airflow condensed in the first condensation zone into an upper part of the second condensation zone, the air outlet being communicated with the second condensation zone and the connection position being located between the first ventilation opening and the second ventilation opening and close to the second ventilation opening, the first airflow and the second airflow flowing into the first drying air duct from the air outlet.

[0025] Optionally, the first vent position and the second vent position are arranged at different heights along the bottom wall of the outer cylinder, wherein the first vent position is arranged at the lower part of the bottom wall of the outer cylinder, and the second vent position is arranged at the upper part of the bottom wall of the outer cylinder.

[0026] Optionally, the laundry processing device includes a controller, and the controller determines whether to end the drying and drying stage according to a difference in air flow temperature between the first vent position and the second vent position.

[0027] According to a third aspect of an embodiment of the present application, a controller is provided, which adopts the above-mentioned method for judging whether laundry is dry.

[0028] According to a fourth aspect of an embodiment of the present application, a laundry processing device is provided, comprising the drying system or the controller described above.

[0029] In an embodiment of the present application, the drying system has a first vent and a second vent. During the drying process, the airflow passing through the second vent does not pass through the first condensation zone, while the airflow passing through the first vent does. This means that during the drying process, the airflow flowing into the second condensation zone from the second vent is uncondensed, while the airflow flowing into the second condensation zone from the first vent is condensed from the first condensation zone. Since condensation affects the temperature of the drying airflow, and the different dryness levels of the laundry have different effects on the drying airflow temperature during condensation, the temperature difference between the airflow at the first and second vents can reflect the condensation status of the drying airflow. This allows the drying result to be determined based on the condensation status, accurately determining the dryness of the laundry. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a three-dimensional diagram of a drying system in one embodiment.

[0031] Figure 2-1 FIG. 1 is a rear view of the drying system in one embodiment (the second condensation zone is visible).

[0032] Figure 2-2 FIG. 1 is a rear view of a drying system in one embodiment (the first condensation zone is visible).

[0033] Figure 3 FIG. 1 is a flow chart of a method for determining a stem in an embodiment.

[0034] Figure 4 4 is an overall flow chart of a dryness determination method in an embodiment.

[0035] Explanation of reference numerals: 1. outer cylinder; 11. first vent; 12. second vent; 13. air outlet; 14. first drying air duct; 141. fan duct; 142. fan; 143. air inlet; 15. second drying air duct; 151. first condensation zone; 152. second condensation zone; 1521. second rib; 1511. first rib. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In recent years, washing and drying machines have been plagued by many problems such as "not drying" and "drying time is too long" due to inaccurate algorithms for judging drying. Especially when the condensing air duct and the rear drum are made into an integrated structure, it is impossible to leave a certain gap between the duct and the outer drum of the washing machine like a traditional external air duct so that the duct surface is basically in contact with the outside world. The design of the integrated air duct allows part of the surface to be used to connect to the drying air duct, which reduces the area of ​​the duct surface in contact with the outside world, and also reduces the channels for heat loss, which will affect the drying efficiency of the entire system. At the same time, it is also difficult to use the existing electric heating start and stop temperature and drying judgment method. In order to adapt to and utilize this change, the condensing structure with the condensing air duct and the rear drum as an integrated structure has high condensing efficiency and a multi-air outlet structure, which makes it difficult to use the existing electric heating start and stop temperature and drying judgment method.

[0039] Therefore, the present application proposes a more accurate dryness judgment method for a washer-dryer structure design with multiple air outlets and multiple condensation zones in which the condensation air duct and the rear tub are integrated.

[0040] To facilitate the description of the laundry drying determination method provided in this embodiment, the present application provides an application example of a drying system.

[0041] The laundry drying judgment method provided in the embodiment of the present application is applied to a drying system of a laundry processing device, such as a drying system of a washing and drying machine. Figure 1 、 2-1As shown in Figure 2-2, the laundry processing equipment includes an inner drum and an outer drum 1, and a drying air duct is formed between the inner drum and the outer drum 1, a first drying air duct 14 and a second drying air duct 15, the first drying air duct is provided with an air inlet 143 connected to the inner drum and an air outlet 13 connected to the outer drum, and the second drying air duct includes a first condensation zone 151 arranged between the outer side of the bottom wall of the inner drum and the inner side of the bottom wall of the outer drum 1, and a second condensation zone provided on the outer side of the bottom wall of the outer drum 1; preferably, the inner and outer wall surfaces of the bottom wall of the rear drum of the outer drum 1 are respectively used to form a condensation structure, and a cover body can be further provided on the side of the bottom wall of the rear drum of the outer drum 1 away from the inner drum, so that the cover body cooperates with the outer wall surface of the bottom wall of the rear drum of the outer drum 1 to form a second condensation zone 152. In order to achieve dehumidification and cooling of each condensation zone, cooling water is introduced into each condensation zone to cool and dehumidify the hot and humid drying air flow.

[0042] The bottom wall of the outer tube 1 is provided with a first vent 11 and a second vent 12. Preferably, the first vent 11 is located at the lower portion of the bottom wall of the outer tube 1, and the first vent 12 is located at the upper portion of the bottom wall of the outer tube 1. Preferably, the second condensation zone 152 serves as the primary condensation zone, and the flow area of ​​the first vent 11 is larger than that of the second vent 12, allowing more air to flow into the second condensation zone 152. The first vent is used to direct the first airflow in the outer tube from the lower portion of the second condensation zone into the second condensation zone, while the second vent is used to direct the second airflow, condensed in the first condensation zone, from the upper portion of the second condensation zone into the second condensation zone. Preferably, the flow area of ​​the first vent 11 is larger than that of the second vent 12, and the air outlet communicates with the second condensation zone between the first and second vents and near the second vent 11. As a result, the dry airflow from the second vent 12 enters the second condensation zone and moves downward, while the dry airflow from the first vent 11 enters the second condensation zone and moves upward before flowing through the air outlet into the first drying air duct. During this movement, the dry airflow comes into contact with the condensed water in the second condensation zone, being cooled and dehumidified. Further preferably, the bottom wall of the rear drum is provided with first ribs 1511 on the first condensation zone side, and second ribs 1521 on the second condensation zone side. These ribs serve to guide the flow, redirect the water flow, and enhance heat dissipation through the ribs' own thermal conductivity.

[0043] The air outlet of the second condensation zone is connected to the air inlet of the fan duct 141 of the first drying air duct. A heating module and a drying fan are provided in the fan duct 141, wherein the heating module can be an electric heater or other device with the function of heating the air flow. The fan 142 drives the drying air flow in the fan duct 141 to flow to the air inlet 143, and finally the drying air flow from the air inlet 143 re-enters the inner drum to dry the laundry. Of course, the first air flow and the second air flow referred to in this application are not two independent air flows that are physically separated. This is only for the convenience of description. It is known to those skilled in the art that the outer drum space is a connected space, and the first air flow and the second air flow are only to distinguish the two air flows flowing into the first and second vent positions.

[0044] Therefore, the flow path of the drying airflow of the drying system provided in this embodiment is inner cylinder-outer cylinder 1-first ventilation port 11 position-lower part of the second condensation zone-air outlet-first drying air duct-air inlet 143-inner cylinder, and / or inner cylinder-outer cylinder 1-first condensation zone-second ventilation port 12 position-upper part of the second condensation zone-air outlet-first drying air duct-air inlet 143-inner cylinder.

[0045] Preferably, the first vent and the second vent are arranged at different heights along the bottom wall of the outer cylinder, wherein the first vent is arranged at the lower part of the bottom wall of the outer cylinder, and the second vent is arranged at the upper part of the bottom wall of the outer cylinder; the first drying air duct is provided with a drying fan for providing circulation power for the drying airflow, a heating module for heating the drying airflow, and a water supply mechanism for providing cooling water for the first and second condensation zones, so that the first condensation zone and the second condensation zone can realize contact heat exchange through direct contact between condensed water and the drying airflow. During this heat exchange process, the humid and hot drying airflow will produce a large amount of condensed water and condensation heat.

[0046] The above analysis demonstrates that the heat exchange conditions in the first and second condensation zones are significantly related to the current drying process of the washing machine. As the drying process progresses, the moisture content of the laundry gradually decreases, and the water vapor in the drying airflow gradually decreases. The lower the humidity of the airflow, the greater the temperature drop. Because the heat exchange capacity of the second condensation zone is significantly greater than that of the first condensation zone, during the contact heat exchange between the first and second condensation zones and the cooling water, as the moisture content of the laundry decreases, the temperature difference between the temperature of the second condensation zone at the first vent location and the airflow temperature at the second vent location increases. Based on this, the drying system of this embodiment further includes a controller, which is designed to determine the drying process and / or determine whether to terminate the drying stage based on the temperature difference between the airflow at the first and second vent locations.

[0047] As known to those skilled in the art, the execution process of the drying program generally includes a heating stage, a drying judgment stage, and a cooling stage. When the drying judgment stage determines that the drying process can be ended, the drying judgment stage is ended and the drying process enters the cooling stage. In this stage, the clothes are no longer heated and dried until the temperature in the drum drops to the door opening condition, and the entire drying process is ended.

[0048] The present application combines the dual condensation characteristics of a clothing processing device with two air outlets and two condensation zones and creatively proposes a method for more accurately determining dryness by utilizing this structure.

[0049] It should be noted that the airflow temperatures at the first and second vent locations in the second condensation zone of the present application are the temperatures after heat exchange with cooling water, not the temperatures of the airflow immediately after it flows out of the first and second vents and before heat exchange. The dryness determination process provided herein utilizes temperature sensors to detect the temperature of the drying airflow after heat exchange with condensed water at locations in the second condensation zone corresponding to the first and second vent locations, respectively. For example, the temperature of the drying airflow after heat exchange detected at the location corresponding to the first vent location is t1, and the temperature of the drying airflow after heat exchange detected at the location corresponding to the second vent location is t2. The difference between t1 and t2 can thus reflect both the moisture content and dryness of the drying airflow. The closer the temperature is to the drying requirement, the lower the moisture content of the laundry, the greater the temperature difference resulting from heat exchange with the condensed water, and the greater the absolute value of the difference between t1 and t2. Therefore, using the difference between t1 and t2 can better control the dryness determination stage compared to existing technologies.

[0050] Example 2

[0051] According to an embodiment of the present application, an embodiment of a method for judging whether laundry is dried is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0052] like Figure 3 As shown, the judgment method embodiment includes:

[0053] S101 , in response to a dryness determination signal, respectively obtaining airflow temperatures of the second condensation zone at a first vent position and a second vent position.

[0054] In one embodiment, a dryness determination signal is used to trigger a dryness determination process. When the dryness determination signal is generated or received, the dryness determination process is initiated, and the dryness determination method of this embodiment is used to determine whether the laundry is dry. Dryness determination refers to determining whether the laundry is dried. The dryness determination signal can be triggered automatically by the program or by the user, and this embodiment does not specifically limit this.

[0055] In one embodiment, temperature sensors or temperature sensors are installed at the first vent 11 and the second vent 12 to detect the temperature of the airflow at the first vent 11 and the temperature of the airflow at the second vent 12. This embodiment does not specifically limit the method for obtaining the temperature of the airflow at the first vent 11 and the second vent 12. A person skilled in the art will understand how to obtain the temperature of the drying airflow at the first vent 11 and the second vent 12 in the second condensation zone based on the teachings of this application. One temperature is the temperature after heat exchange from the first vent to the second condensation zone, and the other is the temperature after heat exchange from the second vent to the second condensation zone. Because the first vent is connected to the upper portion of the second condensation zone, the second vent is connected to the lower portion of the second condensation zone, and the air outlet is close to the first vent, the heat exchange from the first vent to the second condensation zone is relatively small, while the heat exchange from the second vent to the second condensation zone is relatively large. Furthermore, the second vent can be preferably designed with a larger diameter. Therefore, the difference t1-t2 can better reflect the drying degree of the laundry in the drum.

[0056] S102: Determine whether to end the drying and judging stage according to the difference between the air flow temperature at the first vent position and the air flow temperature at the second vent position in the second condensation zone.

[0057] In one embodiment, the temperature difference between the airflow at the first vent 11 and the second vent 12 refers to the difference in airflow temperature at the two vent locations. The difference can be that the airflow temperature at the first vent 11 is greater than the airflow temperature at the second vent 12, or the airflow temperature at the first vent 11 is less than the airflow temperature at the second vent 12. In other words, the difference can represent the relative magnitude of the airflow temperature at the first vent 11 and the second vent 12. The difference can also represent the difference in the airflow temperature at the first vent 11 and the second vent 12, such as a difference of 5, 10, or 15 degrees Celsius.

[0058] It should be noted that when the dryness determination process begins, both the first and second condensation zones contain condensed water or other condensing media. In other words, both zones are in operation, condensing the drying airflow. Consequently, the airflow flowing from the first vent 11 into the second condensation zone, because it does not pass through the first condensation zone, has a temperature close to that of the drying airflow in the outer drum and a higher humidity. The airflow flowing from the second vent 12 into the second condensation zone passes through the first condensation zone, so the temperature of the airflow flowing out of the first vent is lowered due to condensation and has a lower humidity. When the moisture content, or humidity, of the laundry is high, the humidity of the drying airflow after contact with the laundry is also high. The degree of condensation is greater when the drying airflow condenses, and the temperature drop of the drying airflow is less due to the latent heat of vaporization generated by the condensation. When the moisture content of the laundry is low, meaning the laundry is nearly dry, the humidity of the drying airflow after contact with the laundry is lower. The degree of condensation is less when the drying airflow condenses, resulting in a greater temperature drop. According to this feature, whether the laundry has been dried can be determined by the temperature difference between the airflow at the first vent 11 and the airflow at the second vent 12, thereby obtaining the drying result.

[0059] Through the above steps, the drying system has a first vent 11 and a second vent 12. During the flow of the drying airflow, the airflow passing through the first vent 11 does not pass through the condensation zone, while the airflow passing through the second vent 12 passes through the first condensation zone. Therefore, during the drying process, condensation affects the temperature of the drying airflow. Furthermore, the different dryness levels of the laundry have different effects on the temperature of the drying airflow during condensation. Therefore, the temperature difference between the airflow at the first vent 11 and the second vent 12 can reflect the condensation status of the drying airflow. Thus, the drying result can be determined based on the condensation status, achieving accurate dryness determination of the laundry.

[0060] In another embodiment of the present application, determining whether to end the drying and drying stage according to the difference between the airflow temperature of the second condensation zone at the first vent position and the airflow temperature at the second vent position includes:

[0061] When the difference between the first temperature of the airflow at the first vent position and the second temperature of the airflow at the second vent position meets the preset drying condition, it is determined that the drying and drying stage is ended.

[0062] In one embodiment, the temperature difference is used to represent a temperature difference. Specifically, the temperature of the airflow at the first vent 11 is designated as the first temperature, and the temperature of the airflow at the second vent 12 is designated as the second temperature. The difference between the first temperature and the second temperature is obtained by subtracting the absolute value of the second temperature.

[0063] In one embodiment, a dryness determination condition is preset. Specifically, the dryness determination condition is related to the value of the difference. For example, the dryness determination condition is within a numerical range. When the difference falls within this numerical range, it is determined that the difference meets the dryness determination condition. This embodiment does not limit the specific content of the dryness determination condition and can be set according to actual circumstances. The purpose is to determine whether the laundry is dried completely based on the dryness determination condition.

[0064] Through the above steps, the difference in air flow temperature at the first vent 11 and the second vent 12 and the preset drying conditions are used to determine whether the laundry is dried to obtain the drying result. The process is simple, helps to reduce the false alarm rate and save computing resources.

[0065] Specifically, determining whether to terminate the drying phase based on the temperature difference between the airflow at the first vent 11 and the airflow at the second vent 12 , in one embodiment of the present application, the method further includes: determining that the difference meets the drying condition when the absolute value of the difference between the first and second temperatures is greater than a preset drying temperature threshold; or determining that the difference meets the drying condition when the absolute value of the difference between the first and second temperatures is greater than the preset drying temperature threshold and the number of times the difference exceeds the drying temperature threshold exceeds a preset number threshold. In another embodiment, in addition to determining the relationship between the difference and the drying temperature threshold, the number of times is also determined. For example, if the drying temperature threshold is 10-20 degrees Celsius, the number of times the difference falls between 10-20 degrees Celsius is accumulated. When the accumulated number of times equals 10, the drying condition is determined to be met. By adding a number limit to the drying condition, the false alarm rate is reduced and the accuracy of the drying determination is improved. Preferably, the drying temperature threshold and the number threshold vary according to the weight of the laundry to be dried. Different laundry weights correspond to different drying temperature thresholds and number thresholds. For example, the heavier the laundry, the higher the dryness threshold and the number of times threshold. Specifically, a pre-set table can be used to store weight values, dryness thresholds, and number of times thresholds. Each weight value corresponds to a dryness threshold and number of times threshold. Once the weight of the laundry is determined, the corresponding dryness threshold and number of times threshold can be found in the table. The weight values ​​in the table can also be replaced with weight intervals. By associating the dryness threshold and number of times threshold with the laundry weight, the accuracy of the dryness determination result can be improved.

[0066] Example 3

[0067] In another embodiment of the present application, a method is provided for controlling the drying temperature within a preset range during the drying stage, thereby improving the drying effect and energy-saving performance.

[0068] The first drying air duct of the drying system is provided with a heating module for heating the drying airflow in the drying system. The method comprises:

[0069] S501, obtaining the inlet temperature of the airflow at the air inlet 143;

[0070] In one embodiment, the airflow at the air inlet 143 is the airflow from the fan duct 141 to the inner drum. It can also be understood that the airflow at the air inlet 143 is the airflow to the laundry to be dried.

[0071] S502 : Regulating electrical parameters of a heating module in the drying system using proportional-integral-differential control according to the inlet air temperature and a preset inlet air temperature threshold, so as to control the inlet air temperature within the inlet air temperature threshold.

[0072] In one embodiment, proportional-integral-differential control, or PID control, can utilize a PID controller to adjust the electrical parameters of the heating module. The heating module refers to a device that heats the airflow temperature, such as an electric heater, though this embodiment does not limit this. The electrical parameter can be the power of the heating module, or the current or voltage of the heating module. By adjusting the electrical parameters of the heating module, the heating module can precisely control the temperature of the drying airflow within a range when heating the drying airflow, thereby reducing fluctuations in the drying airflow.

[0073] Through the above steps, the PID control algorithm can be used to accurately control the power of the heating module, so that the temperature of the drying airflow can be stably maintained within a certain range, eliminating the need for hot air to circulate in the airflow, reducing energy waste, and improving drying effects and energy-saving performance.

[0074] In another embodiment of the present application, Figure 4 As shown, the electrical parameters of the heating module in the drying system are adjusted using proportional integral differential control according to the inlet air temperature and the preset inlet air temperature threshold, including:

[0075] Calculate the proportional part of the heating module output power change U1 according to the inlet air temperature T and the inlet air temperature threshold T0, where U1 = Kp*(T0-T), Kp is the proportional coefficient;

[0076] The integral control quantity U2 is calculated based on the inlet air temperature T and the inlet air temperature threshold T0, where U2 = Ki*∫(T0-T), Ki is the integral coefficient, and ∫ represents the cumulative sum of the errors;

[0077] The differential control variable U3 is calculated according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U3 = Kd*(dT / dt), and Kd is the integral coefficient.

[0078] Note 1: The PID control algorithm is an automatic control method based on the feedback principle. It can automatically adjust the temperature by real-time detection and processing of temperature feedback signals. The intelligent PID control algorithm includes the following three parts:

[0079] Proportional control: This part determines the change in the heating element's output power by calculating the difference between the current temperature and the target temperature. Specifically, assuming the current temperature is T, the target temperature is T0, and the proportional coefficient is Kp, the change in the heating element's output power is Kp*(T0-T).

[0080] Integral control: This part is used to reduce error accumulation and avoid steady-state errors. Specifically, assuming the target temperature is T0, the current temperature is T, and the integral coefficient is Ki, the control amount of the integral control part is Ki*∫(T0-T), where ∫ represents the accumulated sum of the errors.

[0081] Differential control: This part is used to suppress instantaneous fluctuations in error, making the system more stable. Specifically, assuming the current temperature is T, the target temperature is T0, and the differential coefficient is Kd, the control variable of the differential control is Kd*(dT / dt), where dT / dt represents the rate of change of temperature. The power output of the electric heating element is determined, thereby ensuring that the temperature of the drying airflow is stably maintained within the set target temperature range.

[0082] It should be noted that during the operation of the heating module, or even when the heating module needs to be switched from an on state to an off state, PID control is used to adjust parameters. In one embodiment, the heating module is an electric heating device.

[0083] In another embodiment of the present application, Figure 4 As shown, after obtaining the inlet temperature of the airflow at the air inlet 143, the method further includes:

[0084] When the inlet air temperature is lower than the lower limit of the inlet air temperature threshold, the heating module is controlled to turn on;

[0085] When the inlet air temperature is greater than the upper limit of the inlet air temperature threshold, the heating module is controlled to be turned off, and it is determined whether the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time;

[0086] If the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time, a dryness determination signal is responded to.

[0087] In one embodiment, the upper limit is 95 degrees Celsius and the lower limit is 85 degrees Celsius. Initially, when the air inlet 143 temperature is below a first preset temperature threshold T1, the electric heater and fan 142 are turned on, continuously blowing dry hot air into the drum. Over time, the temperature of the hot air blown into the drum increases. When the air inlet 143 temperature exceeds a first preset temperature threshold T2, the electric heater is turned off, while the fan 142 continues to operate. When the air inlet 143 temperature is less than the first preset temperature threshold T2 and the condensate water valve controller is not yet open, the laundry processing washer-dryer is determined to be in the drying and heating phase of the drying process. When the air inlet 143 temperature exceeds the first preset temperature threshold T2 for the first time, the condensate water valve is opened, and the laundry processing washer-dryer enters the drying and drying phase. When the laundry processing washer-dryer is determined to have completed drying, the drying and drying phase is exited, and the drying and cooling phase is entered. The electric heater is turned off, and the fan 142 continues to operate, lowering the temperature in the drum.

[0088] Example 4

[0089] The embodiments of the present application also provide a controller for implementing the above-mentioned method for judging whether laundry is dry and a washer-dryer using the same.

[0090] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0091] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0093] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0094] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0095] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code.

[0096] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for judging whether laundry is dry, characterized in that:

14. The method of claim 13, wherein the at least one air duct is configured to extend from the bottom wall of the drying machine to the outside of the drying machine, wherein the at least one air duct is configured to extend from the bottom wall of the drying machine to the outside of the drying machine. In response to the dryness determination signal, respectively acquiring the airflow temperature of the second condensation zone at the first vent position and the second vent position; Whether to end the drying and drying stage is determined according to the difference between the air flow temperature of the second condensation zone at the first vent position and the air flow temperature at the second vent position.

2. The method for judging whether laundry is dry according to claim 1, wherein: The step of determining whether to end the drying and drying stage according to the difference between the air flow temperature of the second condensation zone at the first vent position and the air flow temperature at the second vent position includes: When the difference between the first temperature of the airflow at the first vent position and the second temperature of the airflow at the second vent position meets the preset drying condition, it is determined that the drying and drying stage is ended.

3. The method for judging whether laundry is dry according to claim 2, wherein: The method further comprises: When the absolute value of the difference between the first temperature and the second temperature is greater than the preset dryness judgment temperature threshold, it is determined that the difference meets the dryness judgment condition, or When the absolute value of the difference between the first temperature and the second temperature is greater than a preset dry temperature threshold and the number of times the difference is greater than the dry temperature threshold exceeds a preset number threshold, it is determined that the difference meets the dry condition.

4. The method for judging whether laundry is dry according to claim 3, wherein: The drying temperature threshold and the number threshold are changed according to the weight of the laundry to be dried in the drying system.

5. The method for judging whether laundry is dry according to claim 1, wherein: The first drying air duct of the drying system is provided with a heating module for heating the drying airflow in the drying system, and the method further comprises: Obtaining the inlet temperature of the airflow at the air inlet; Proportional-integral-differential control is used to adjust electrical parameters of the heating module in the drying system according to the inlet air temperature and a preset inlet air temperature threshold, so as to control the inlet air temperature within the inlet air temperature threshold.

6. The method for judging whether laundry is dry according to claim 5, wherein: The method of adjusting the electrical parameters of the heating module in the drying system using proportional-integral-differential control according to the inlet air temperature and a preset inlet air temperature threshold comprises: Calculate the proportional part of the heating module output power change U1 according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U1=Kp*(T0-T), Kp is the proportional coefficient; Calculate the integral control quantity U2 according to the inlet air temperature T and the inlet air temperature threshold T0, where U2=Ki*∫(T0-T), Ki is the integral coefficient, and ∫ represents the cumulative sum of the errors; The differential control variable U3 is calculated according to the inlet air temperature T and the inlet air temperature threshold T0, wherein U3=Kd*(dT / dt), and Kd is the integral coefficient.

7. The method for judging whether laundry is dry according to claim 5, wherein: After obtaining the inlet temperature of the airflow at the air inlet, the method further includes: When the inlet air temperature is lower than the lower limit of the inlet air temperature threshold, controlling the heating module to turn on; When the inlet air temperature is greater than the upper limit of the inlet air temperature threshold, controlling the heating module to be turned off, and determining whether the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time; If the inlet air temperature exceeds the upper limit of the inlet air temperature threshold for the first time, the dryness determination signal is responded to.

8. A laundry processing device, characterized in that:

16. The laundry processing device according to claim 14, wherein the laundry processing device comprises an inner drum and an outer drum, wherein a drying duct is formed between the inner drum and the outer drum, wherein the drying duct comprises a first drying duct and a second drying duct, wherein the first drying duct is provided with an air inlet communicating with the inner drum and an air outlet communicating with the outer drum, wherein the second drying duct comprises a first condensation area arranged between an outer side of a bottom wall of the inner drum and an inner side of a bottom wall of the outer drum, and a second condensation area arranged outside the bottom wall of the outer drum; the bottom wall of the outer drum is provided with a first ventilation opening and a second ventilation opening, wherein a flow area of ​​the first ventilation opening is larger than a flow area of ​​the second ventilation opening, the first ventilation opening is used to send the first airflow in the outer drum into a lower part of the second condensation area, and the second ventilation opening is used to send the second airflow condensed in the first condensation area into an upper part of the second condensation area, the air outlet is communicated with the second condensation area, and the communication position is located between the first ventilation opening and the second ventilation opening and close to the second ventilation opening, and the first airflow and the second airflow flow into the first drying duct from the air outlet. The laundry processing device includes a controller, and the controller determines whether to end the drying and drying stage according to the difference in air flow temperature between the first vent position and the second vent position.

9. The laundry processing equipment according to claim 8, characterized in that The first vent position and the second vent position are arranged at different heights along the bottom wall of the outer cylinder, wherein the first vent position is arranged at the lower part of the bottom wall of the outer cylinder, and the second vent position is arranged at the upper part of the bottom wall of the outer cylinder.

10. A controller, characterized in that: The method for drying and judging whether laundry is dry is adopted according to any one of claims 1 to 7.

11. A laundry processing device, characterized in that: A controller according to claim 10 is provided.

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