Roller washing machine

Abstract

The invention relates to a roller washing machine, and belongs to the technical field of washing machines. The roller washing machine comprises a machine body and a barrel arranged in the machine body; the controller is configured to control the motor to accelerate from a first rotating speed to a second rotating speed at a first acceleration within a first preset time when clothes are washed; within the first preset time, the first torque of the barrel is calculated; controlling the motor to decelerate from the second rotating speed to the first rotating speed at a second acceleration within a second preset time; and within the second preset time, the second torque of the cylinder is calculated. The difference value of the first torque and the second torque is a torque difference delta T, the transmission ratio between the motor and the barrel is c, the radius of the barrel is R, the difference value of the first acceleration and the second acceleration is delta a, the total mass mz of the barrel and the clothes inside the barrel is obtained through a calculation formula # imgabs0 #, and the mass m of the clothes inside the barrel is obtained by subtracting the mass mt of the barrel. Therefore, the influence of the resistance of the drum washing machine system is eliminated, and the mass m of clothes in the drum is accurately obtained.

Description

Technical Field

[0001] The present application relates to the technical field of washing machines, and in particular to a drum washing machine. Background Art

[0002] With the continuous development of science and technology and the pursuit of a better and more convenient life by users, washing machines came into being, solving the tiring housework of washing clothes in people's daily life and freeing people's hands. Therefore, washing machines have entered thousands of households. Drum washing machines have become the main model in the current washing machine market due to their many advantages such as low wear, no entanglement and large capacity.

[0003] During the washing process of the drum washing machine, the washing time, water intake time, water intake amount and washing rhythm can be controlled according to the weight of the laundry. Therefore, before washing, it is generally necessary to determine the weight of the laundry.

[0004] The traditional weighing method is to calculate the average torque value during the uniform speed stage and the acceleration stage of the drum washing machine, and use the average torque during the uniform speed stage as the system resistance value. However, since the system resistance will change with the speed change, there is a difference between the system resistance in the uniform speed stage and the system resistance in the acceleration stage. Therefore, the calculated mass deviation is large, resulting in a low accuracy rate in weighing clothes in the drum washing machine. Summary of the invention

[0005] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the present application aims to provide a drum washing machine, which calculates the torque in the acceleration stage and deceleration stage of the drum washing machine respectively, and the speed change range in the acceleration stage and the deceleration stage is consistent, thereby eliminating the influence of the resistance of the drum washing machine system to accurately obtain the mass m of the clothes inside the drum.

[0007] In order to achieve the above object, the present invention provides a drum washing machine, comprising:

[0008] Body;

[0009] A cylinder, the cylinder being arranged in the body;

[0010] A motor, which is disposed in the body and is used to drive the cylinder to rotate;

[0011] A controller, wherein the controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed at a first acceleration within a first preset time;

[0012] Calculating a first torque of the cylinder within the first preset time;

[0013] Control the motor to decelerate from the second speed to the first speed at a second acceleration within a second preset time;

[0014] Calculating a second torque of the cylinder within the second preset time;

[0015] The difference between the first torque and the second torque is defined as the torque difference ΔT, and the total mass of the drum and the clothes inside it is m z , the radius of the cylinder is R, the difference between the first acceleration and the second acceleration is Δa, and the mass of the cylinder itself is m t ;

[0016] Calculation formula Get the total mass m of the drum and the clothes inside it z , minus the mass m of the cylinder itself t , to obtain the mass m of the clothes inside the drum.

[0017] In the technical solution, the torque is calculated in the acceleration stage and deceleration stage of the drum washing machine respectively, and the speed variation range in the acceleration stage and the deceleration stage are consistent, thereby eliminating the influence of the system resistance of the drum washing machine to accurately obtain the mass m of the clothes inside the drum.

[0018] In order to achieve the above object, the present invention further provides a drum washing machine, comprising:

[0019] Body;

[0020] A cylinder, the cylinder being arranged in the body;

[0021] A motor, which is disposed in the body and is used to drive the cylinder to rotate;

[0022] A controller, wherein the controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed at a first acceleration within a first preset time;

[0023] Calculating the torque T0 generated by the resistance of the cylinder during the rotation process within the first preset time;

[0024] Control the motor to decelerate from the second speed to the first speed at a second acceleration within a second preset time;

[0025] In the second preset time, the torque T0 generated by the resistance of the cylinder during rotation is adjusted to calculate the second torque of the cylinder;

[0026] Define the difference between the first torque and the second torque as the torque difference ΔT, the transmission ratio between the motor and the drum as c, and the total mass of the drum and the clothes inside it as m z, the radius of the cylinder is R, the difference between the first acceleration and the second acceleration is Δa, and the mass of the cylinder itself is m t ;

[0027] Calculation formula Get the total mass m of the drum and the clothes inside it z , minus the mass m of the cylinder itself t , to obtain the mass m of the clothes inside the drum.

[0028] In the technical solution, the torque T0 generated by the system resistance in the acceleration stage of the drum washing machine is first obtained. Since the speed variation range in the acceleration stage and the deceleration stage is consistent, the torque T0 generated by the system resistance is applied to the deceleration stage, thereby eliminating the influence of the system resistance of the drum washing machine to accurately obtain the mass m of the clothes inside the drum.

[0029] In some embodiments of the present application, the calculation formula of the torque T of the cylinder is:

[0030] Among them, J Z =m z ×R 2 , J Z is the total moment of inertia of the drum and the clothes inside it, a is the acceleration of the motor, T0 is the torque generated by the resistance of the drum during rotation, c is the transmission ratio between the motor and the drum, T e is the torque of the motor.

[0031] In some embodiments of the present application, the controller is further configured to: obtain the torque ratio value between the motor and the cylinder, T = c × T e , the first torque and the second torque of the cylinder are obtained by the torque ratio value.

[0032] In some embodiments of the present application, when the cylinder is empty, the controller is further configured to: control the motor to accelerate from the first speed to the second speed at the first acceleration within the first preset time;

[0033] Calculating a fifth torque of the cylinder itself within the first preset time;

[0034] Controlling the motor to decelerate from the second speed to the first speed at the second acceleration within the second preset time;

[0035] Calculating a sixth torque of the cylinder itself within the second preset time;

[0036] defining a difference between the fifth torque and the sixth torque as a torque difference ΔT0;

[0037] By formula Get the mass m of the cylinder itself t .

[0038] In some embodiments of the present application, the controller first obtains the mass m of the cylinder itself. t , and recorded in the controller, and then calculate the total mass m of the drum and the clothes inside it z .

[0039] In some embodiments of the present application, the controller is configured such that the first acceleration is different from the second acceleration.

[0040] In some embodiments of the present application, the first rotational speed ranges from 80RPM to 95RPM, and the second rotational speed ranges from 145RPM to 155RPM.

[0041] In some embodiments of the present application, the cylinder is connected to a transmission shaft, and the motor drives the transmission shaft through a belt drive. The speed of the motor ω d and the rotation speed ω of the cylinder t The relationship is: d =c×ω t , c is the transmission ratio between the motor and the cylinder.

[0042] In some embodiments of the present application, the controller is further configured to obtain operating parameters of the drum washing machine according to the mass m of the clothes in the drum, and the operating parameters include washing time, washing intensity, washing water consumption, and water intake time.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of the overall structure of a drum washing machine according to an embodiment of the present application;

[0045] Figure 2 is a cross-sectional view of the overall structure of a drum washing machine according to an embodiment of the present application;

[0046] Figure 3 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0047] Figure 4 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0048] Figure 5is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0049] Figure 6 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0050] Figure 7 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0051] Figure 8 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0052] Fig. 9 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application;

[0053] Fig.10 4 is a control flow chart of a controller of a drum washing machine according to an embodiment of the present application.

[0054] In the above figures: 100, machine body; 200, cylinder. DETAILED DESCRIPTION

[0055] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0060] In the present application, the drum washing machine includes a casing, a drum, a door and a driving member. Clothes are placed in the drum, and after the door is closed, water is poured into the drum. The drum is driven to rotate by the driving member, and the inertia of the water is used to clean the clothes.

[0061] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0062] As attached Figure 1 and Figure 3 As shown, in an exemplary embodiment of the washing machine of the present invention, the drum washing machine comprises a body 100 and a drum 200, wherein the drum 200 is arranged in the body 100; a motor is arranged in the body 100, and the motor is used to drive the drum 200 to rotate. The controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed at a first acceleration a1 within a first preset time; calculate a first torque T1 of the drum 200 within the first preset time; control the motor to decelerate from a second speed to a first speed at a second acceleration a2 within a second preset time; and calculate a second torque of the drum 200 within the second preset time.

[0063] Define the difference between the first torque T1 and the second torque of the drum as the torque difference ΔT, the transmission ratio between the motor and the drum 200 is c, and the total mass of the drum 200 and the clothes inside it is m z , the radius of the cylinder 200 is R, the difference between the first acceleration a1 and the second acceleration a2 is Δa, and the mass of the cylinder 200 itself is m t ; Calculation formula Get the total mass m of the drum 200 and the clothes inside it z , minus the mass m of the cylinder 200 itself t , to obtain the mass m of the clothes inside the drum 200.

[0064] As attached Figure 4 and 5 As shown, the control steps of the controller are: the first step is to determine whether the motor reaches the first speed. If it reaches the first speed, it goes to the second step. If it does not reach the first speed, it continues to accelerate to the first speed; the second step is to control the motor to accelerate from the first speed to the second speed at the first acceleration a1 within the first preset time; the third step is to obtain the third average torque T of the motor e1 , the first acceleration a1, the radius R of the cylinder 200, the transmission ratio c between the motor and the cylinder; the fourth step, calculate the first torque of the cylinder 200 Step 5: Control the motor to decelerate from the second speed to the first speed at a second acceleration a2 within a second preset time; Step 6: Obtain the third average torque T of the motor e2 , the first acceleration a2, the radius R of the cylinder 200, the transmission ratio c between the motor and the cylinder; Step 7, calculate the second torque of the cylinder 200 Step 8: Get the mass m of the cylinder itself t ; Step 9, obtain the mass m of the clothes inside the drum 200, and calculate the formula

[0065] Through the above technical scheme, the torque of the drum 200 is calculated in the acceleration stage and the deceleration stage of the drum washing machine respectively. The speed change range in the acceleration stage and the deceleration stage is consistent, thereby eliminating the influence of the system resistance of the drum washing machine to accurately obtain the mass m of the clothes inside the drum 200, thereby improving the measurement accuracy and ensuring that the drum washing machine obtains a better washing effect.

[0066] As attached Figure 6 and 7As shown, in addition, the present application also provides a drum washing machine, including a body 100, a drum 200, and a motor, the drum 200 is arranged in the body 100, the motor is arranged in the body 100, and the motor is used to drive the drum 200 to rotate; the controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed with a first acceleration a1 within a first preset time; within the first preset time, calculate the torque T0 generated by the resistance of the drum 200 during the rotation process; control the motor to decelerate from the second speed to the first speed with a second acceleration a2 within a second preset time; within the second preset time, adjust the torque T0 generated by the resistance of the drum 200 during the rotation process to calculate the second torque of the drum 200.

[0067] Define the difference between the first torque T1 and the second torque as the torque difference ΔT, and the total mass of the drum 200 and the clothes inside it is m z , the radius of the cylinder 200 is R, the difference between the first acceleration a1 and the second acceleration a2 is Δa, and the mass of the cylinder 200 itself is m t ; Calculation formula Get the total mass m of the drum 200 and the clothes inside it z , minus the mass m of the cylinder 200 itself t , to obtain the mass m of the clothes inside the drum 200.

[0068] In the prior art, the average torque of the drum washing machine in the acceleration stage and the uniform speed stage is calculated respectively, and the average torque in the uniform speed stage is used as the torque T0 generated by the resistance of the drum 200 during the rotation process, and the torque in the acceleration stage and the uniform speed stage are subtracted to obtain the mass m of the clothes inside the drum 200. Since the resistance of the drum 200 during the rotation process will change with the change of the rotation speed of the drum 200, there is a difference between the system resistance in the uniform speed stage and the system resistance in the acceleration stage, so the calculated mass deviation of the clothes inside the drum 200 is relatively large.

[0069] Through the above technical scheme, the torque T0 generated by the system resistance in the acceleration stage of the drum 200 is first obtained. Since the speed change ranges in the acceleration stage and the deceleration stage are consistent, the resistance generated by the system in the acceleration stage and the deceleration stage of the drum 200 is the same. Therefore, the torque T0 generated by the system resistance can be applied to the deceleration stage, thereby eliminating the influence of the system resistance of the drum washing machine, avoiding the influence of the system resistance on the speed, so as to accurately obtain the mass m of the clothes inside the drum 200, improve the washing effect of the drum washing machine, provide a good user experience, and greatly improve the reliability of the drum washing machine.

[0070] In some embodiments, the drum washing machine further includes a driving module, which is electrically connected to the controller and is used to drive the controller to operate.

[0071] As attached Figure 8As shown, in some embodiments, the calculation formula of the torque T of the cylinder 200 is:

[0072] When washing clothes, within the first preset time, the first torque T1 of the drum 200 is:

[0073] By subtracting the first torque T1 of the cylinder 200 during the acceleration phase and the second torque T2 during the deceleration phase, the following relationship can be obtained:

[0074]

[0075] The total mass of the drum 200 and the clothes inside it is m z for:

[0076] Among them, T e1 is the third average torque of the motor, T e2 is the fourth average torque of the motor.

[0077] In some embodiments, the controller is further configured to: obtain the torque ratio value between the motor and the barrel 200, T = c × T e , the first torque T1 and the second torque T2 of the cylinder 200 are obtained through the torque ratio value.

[0078] In some embodiments, within the first preset time, the third torque of the motor is obtained at the same interval, and the average value of the plurality of third torques of the motor is determined as the third average torque T of the motor. e1 , thereby obtaining the first torque T1 of the cylinder 200 = c × T e1 .

[0079] Within the second preset time, the fourth torque of the motor is obtained at the same interval, and the average value of the plurality of fourth torques of the motor is determined as the fourth average torque T of the motor. e2 , thereby obtaining the second torque T2 of the cylinder 200 = c × T e2 In this way, the torque value obtained is more accurate.

[0080] In some embodiments, within the first preset time, the controller obtains the motor output torque every 1 ms. After the acceleration is completed, the torque values ​​obtained during the acceleration period are averaged to obtain a third average torque T in the acceleration stage. e1 In the second preset time, the controller obtains the motor output torque every 1ms. After the deceleration is completed, the torque values ​​obtained during the deceleration are averaged to obtain the fourth average torque T of the deceleration stage. e2 .

[0081] As attached Figure 5 As described, in some embodiments, when the cylinder 200 is empty, the controller is also configured to: control the motor to accelerate from the first speed to the second speed with the first acceleration a1 within the first preset time; calculate the fifth torque of the cylinder 200 itself within the first preset time; control the motor to decelerate from the second speed to the first speed with the second acceleration a2 within the second preset time; and calculate the sixth torque of the cylinder 200 itself within the second preset time.

[0082] The difference between the fifth torque and the sixth torque is defined as the torque difference ΔT0, and the formula Get the mass m of the cylinder itself t .

[0083] When there is no clothing in the drum 200, that is, when the drum 200 is empty, within the first preset time, the fifth torque T3 of the drum 200 is:

[0084] In the second preset time t2, the sixth torque T4 of the cylinder 200 is:

[0085] By subtracting the fifth torque T3 of the empty cylinder in the acceleration phase and the sixth torque T4 in the deceleration phase, the following relationship can be obtained:

[0086]

[0087] The mass of the cylinder 200 itself is m t for:

[0088] Among them, T e3 is the seventh average torque of the motor, T e4 It is the eighth average torque of the motor.

[0089] The mass of the clothes inside the drum is m: Where R and c are fixed values ​​in the drum washing machine, T e1 、T e2 、T e3 、T e4 , a1, and a2 can be obtained from the controller.

[0090] In some embodiments, when the cylinder 200 is empty, the seventh torque of the motor is obtained at the same interval within the first preset time, and the average value of the plurality of seventh torques of the motor is determined as the seventh average torque Te1 of the motor, thereby obtaining the fifth torque T3 of the cylinder 200 = cT e3 .

[0091] Within the second preset time, the eighth torque of the motor is obtained at the same interval, and the average value of the plurality of eighth torques of the motor is determined as the eighth average torque T of the motor. e4 , thereby obtaining the sixth torque T4=cT of the cylinder 200 e4 .

[0092] In some embodiments, within the first preset time, the controller obtains the motor output torque every 1 ms. After the acceleration is completed, the torque values ​​obtained during the acceleration period are averaged to obtain the seventh average torque T of the acceleration stage. e3 In the second preset time, the controller obtains the motor output torque every 1ms. After the deceleration is completed, the torque values ​​obtained during the deceleration are averaged to obtain the eighth average torque T of the deceleration stage. e4 .

[0093] In some embodiments, the controller first obtains the mass m of the cylinder 200 itself. t , and recorded in the controller, and then calculate the total mass m of the drum 200 and the clothes inside it z .

[0094] As attached Fig. 9 As shown, in some embodiments, the mass m of the cylinder 200 itself t The factory settings are recorded in the controller, so that the user can obtain the mass m of the clothes in the drum 200 when using it.

[0095] In some embodiments, the controller is configured such that: the first acceleration a1 is different from the second acceleration a2; and since the speed variation ranges of the acceleration phase and the deceleration phase are the same, the first preset time and the second preset time have different durations.

[0096] In some embodiments, the first speed ranges from 80RPM to 95RPM, and the second speed ranges from 145RPM to 155RPM. If the speed is too low, the clothes in the drum are not attached to the drum wall and cannot rotate synchronously with the drum body 200; if the speed is too high, the clothes will hit the drum due to eccentricity.

[0097] In some embodiments, the first rotational speed is 90RPM and the second rotational speed is 150RPM, so that the clothes in the drum 200 stick to the drum wall due to the action of centrifugal force within the range of the first rotational speed and the second rotational speed, and the drum 200 and the clothes therein are rotated as a hollow cylindrical rigid body, so that the obtained clothing weight data is more accurate.

[0098] In some embodiments, the cylinder 200 is connected to a transmission shaft, and the motor drives the transmission shaft through a belt drive. d and the rotation speed ω of the cylinder 200 t The relationship is: d =c×ω t, c is the transmission ratio between the motor and the cylinder 200.

[0099] In some embodiments, the acceleration a of the motor d The acceleration a of the cylinder 200 t The relationship is: a d =c×a t .

[0100] In some embodiments, the controller is further configured to obtain operating parameters of the drum washing machine according to the mass m of the clothes in the drum 200, wherein the operating parameters include washing time, washing intensity, washing water consumption, and water intake time.

[0101] In some embodiments, the motor is a permanent magnet synchronous motor to drive the drum 200 to rotate, thereby washing the clothes in the drum 200.

[0102] In some embodiments, there is a belt drive mechanism between the motor and the cylinder, which includes a driving pulley, a driven pulley and a transmission belt looped around the driving pulley and the driven pulley. The driving pulley is mounted on the output shaft of the permanent magnet synchronous motor, and the driven pulley is fixedly connected to the cylinder via a driving shaft.

[0103] In some embodiments, the controller refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the drum washing machine to execute the control instruction. The controller can be a central processing unit, a general-purpose processor network processor, a digital signal processor, a microprocessor, a microcontroller, a programmable logic device, or any combination thereof. The controller can also be other devices with processing functions.

[0104] In some embodiments, the controller can be used to control the operation of various components inside the drum washing machine, so that the various components of the drum washing machine operate to achieve various predetermined functions of the drum washing machine.

[0105] In some embodiments, the body 100 adopts a rectangular hollow structure, and the body 100 serves as the outer shell of the drum washing machine and is aesthetically pleasing.

[0106] In some embodiments, a clothing inlet is provided on the machine body 100, and a door body is provided at the clothing inlet of the machine body 100, and the door body can open and close the clothing inlet.

[0107] In some embodiments, the door body and the box body are hingedly connected so that the door body can rotate around the axis of the door hinge to open and close the door body, thereby opening and closing the clothing loading port.

[0108] In some embodiments, the drum washing machine also includes a control panel, which is arranged on the surface of the body 100 and is used by the user to select a washing program. The drum 200 is connected to the rotating shaft of the motor through a bearing. Therefore, the driving motor can directly drive the drum 200 to rotate, thereby washing the clothes in the drum 200.

[0109] In some embodiments, the drum 200 includes an inner drum and an outer drum. The drum 200 is used to hold clothes. The drum 200 includes dehydration holes. The outer drum can be used to store washing water.

[0110] In some embodiments, the outer drum is a shell structure with a barrel opening, the barrel opening of the outer drum is directly opposite to the clothing inlet of the box, and the outer drum is used to hold washing liquid. The inner drum is rotatably arranged inside the outer drum, and a clothing washing cavity is formed in the inner drum, and the washing cavity is used to hold the clothes to be washed. The barrel opening of the inner drum is directly opposite to the barrel opening of the outer drum. Therefore, the clothes can enter the washing cavity from the clothing inlet of the box, the barrel opening of the outer drum, and the barrel opening of the inner drum in sequence.

[0111] In some embodiments, the outer drum and the inner drum are coaxially arranged inside and outside, and a hole is opened on the outer wall of the inner drum, and water in the outer drum can enter the inner drum through the hole to wash the clothes in the inner drum.

[0112] In some embodiments, a water supply pipeline is provided on the outer drum, the water supply pipeline is connected to the inner drum, and a laundry detergent inlet is provided on the water supply pipeline.

[0113] In some embodiments, the door is made of transparent material to facilitate users to observe the status of clothes when the drum washing machine is working.

[0114] When washing clothes, first open the door, put the clothes to be washed into the inner drum, then put detergent into the detergent inlet, turn on the power switch, and the user selects the operation mode on the control panel according to the type of laundry, inputs the start operation instruction, and the washing machine control system starts to control the entire operation process.

[0115] After the washing program is started, the weight of the clothes put into the drum 200 is first detected. The controller sends a weighing command, the drive motor starts working, and the weighing program is entered. After the weighing program is completed, the corresponding operating parameters are determined according to the weight of the clothes, and then all washing programs are started. The water inlet valve is opened, and washing water mixed with laundry detergent is supplied to the drum 200 through the water supply pipeline. The water supply continues until the water level reaches a water level that matches the detected amount of clothes.

[0116] When the water level in the cylinder 200 does not reach the set water level, the water inlet valve is always open. When the water level reaches the set water level, the controller will issue a control command to close the water inlet valve.

[0117] When the water level in the outer drum reaches the specified level, the washing machine can start the washing program. After the washing operation is completed, the drain valve under the outer drum will open to drain the washing water in the outer drum, and then the dehydration operation will be performed.

[0118] After the dehydration operation has been carried out for a specified time, the drain valve is closed again, the water inlet valve is opened, new water is added to the outer drum, and the rinsing operation begins.

[0119] After the rinsing operation is performed for a specified time, the dehydration operation is performed, and the above process is repeated until all the washing operation processes are completed. Finally, the power switch is turned off to end the operation.

[0120] In some embodiments, the drum washing machine also includes a voice device for prompting the user to complete related operations, such as prompting the user to add detergent, prompting the completion of washing, etc., thereby improving the intelligence level of the drum washing machine.

[0121] As attached Fig.10 As shown, in some embodiments, the drum washing machine supplies power to the motor through the control circuit, thereby controlling the motor to accelerate and rotate, driving the drum washing machine to rotate to the first speed, and then controlling the motor to accelerate from the first speed to the second speed at the first acceleration a1 within the first preset time, and calculating the first torque T1 of the drum 200; then controlling the motor to decelerate from the second speed to the first speed at the second acceleration a2 within the second preset time, and calculating the second torque T2 of the drum 200; finally, the mass m of the clothes inside the drum 200 is calculated by the formula. The first speed, the second speed, the first preset time, the first acceleration a1, the second preset time, and the second acceleration a2 are preset and can be set according to the specific situation of the drum washing machine.

[0122] In some embodiments, the control step of the controller also includes a correction step: after calculating the mass m of the clothes inside the drum 200 once, repeat the first to fourth steps at least once, and take the average of the mass m of the clothes inside the drum 200 obtained each time as the final mass m of the clothes inside the drum 200.

[0123] In some embodiments, the controller performs two correction steps, obtains the mass m of the clothes inside the drum 200 three times, and takes the average value as the final data, so that the obtained data result is more accurate.

[0124] In some embodiments, the drum washing machine further includes an acquisition unit and a determination unit, the acquisition unit being used to acquire the rotation speed of the motor, and the determination unit being used to determine the weight of the clothes inside the drum 200 according to the torque difference.

[0125] In some embodiments, the drum washing machine further comprises a memory and a processor, wherein the memory is used to store a control program necessary for driving the main control unit and user-defined data input via a user interface. The processor is used to implement the control steps of the controller when executing the computer program.

[0126] In some embodiments, the resistance of the cylinder 200 during rotation is the same in the first preset time and the second preset time. Since the rotation speed variation range is the same in the first preset time and the second preset time, the influence of the system resistance on the rotation speed variation is avoided.

[0127] In some embodiments, the cylinder 200 accelerates within a first preset time, moves at a constant speed at a first speed, and then decelerates. When the cylinder 200 moves at a constant speed, the controller can obtain the average torque of the motor in the acceleration stage during this period of time.

[0128] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A drum washing machine, characterized in that: It includes: Body; A cylinder, the cylinder being arranged in the body; A motor, which is disposed in the body and is used to drive the cylinder to rotate; A controller, wherein the controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed at a first acceleration within a first preset time; Calculating a first torque of the cylinder within the first preset time; Control the motor to decelerate from the second speed to the first speed at a second acceleration within a second preset time; Calculating a second torque of the cylinder within the second preset time; Define the difference between the first torque and the second torque as the torque difference ΔT, the transmission ratio between the motor and the drum as c, and the total mass of the drum and the clothes inside it as m z , the radius of the cylinder is R, the difference between the first acceleration and the second acceleration is Δa, and the mass of the cylinder itself is m t ; Calculation formula Get the total mass m of the drum and the clothes inside it z , minus the mass m of the cylinder itself t , to obtain the mass m of the clothes inside the drum.

2. A drum washing machine, characterized in that: It includes: Body; A cylinder, the cylinder being arranged in the body; A motor, which is disposed in the body and is used to drive the cylinder to rotate; A controller, wherein the controller is configured to: when washing clothes, control the motor to accelerate from a first speed to a second speed at a first acceleration within a first preset time; Calculating the torque T0 generated by the resistance of the cylinder during the rotation process within the first preset time; Control the motor to decelerate from the second speed to the first speed at a second acceleration within a second preset time; In the second preset time, the torque T0 generated by the resistance of the cylinder during rotation is adjusted to calculate the second torque of the cylinder; Define the difference between the first torque and the second torque as the torque difference ΔT, the transmission ratio between the motor and the drum as c, and the total mass of the drum and the clothes inside it as m z , the radius of the cylinder is R, the difference between the first acceleration and the second acceleration is Δa, and the mass of the cylinder itself is m t ; Calculation formula Get the total mass m of the drum and the clothes inside it z , minus the mass m of the cylinder itself t , to obtain the mass m of the clothes inside the drum.

3. The drum washing machine according to any one of claims 1 or 2, characterized in that: The calculation formula of the torque T of the cylinder is: Among them, J z =m z ×R 2 , J z is the total moment of inertia of the drum and the clothes inside it, a is the acceleration of the motor, T0 is the torque generated by the resistance of the drum during rotation, T e is the torque of the motor.

4. The drum washing machine according to claim 3, characterized in that: The controller is further configured to: obtain a torque ratio value between the motor and the cylinder, T=c×T e , the first torque and the second torque of the cylinder are obtained through the torque ratio value.

5. The drum washing machine according to any one of claims 1 or 2, characterized in that: When the cylinder is empty, the controller is further configured to: control the motor to accelerate from the first speed to the second speed at the first acceleration within the first preset time; Calculating a fifth torque of the cylinder itself within the first preset time; Controlling the motor to decelerate from the second speed to the first speed at the second acceleration within the second preset time; Calculating a sixth torque of the cylinder itself within the second preset time; defining a difference between the fifth torque and the sixth torque as a torque difference ΔT0; By formula Get the mass m of the cylinder itself t .

6. The drum washing machine according to claim 5, characterized in that: The controller first obtains the mass m of the cylinder itself t , and recorded in the controller, and then calculate the total mass m of the drum and the clothes inside it z .

7. The drum washing machine according to any one of claims 1 or 2, characterized in that: The controller is configured such that the first acceleration is different from the second acceleration.

8. The drum washing machine according to claim 7, characterized in that: The first speed ranges from 80RPM to 95RPM, and the second speed ranges from 145RPM to 155RPM.

9. The drum washing machine according to any one of claims 1 or 2, characterized in that: The cylinder is connected to a transmission shaft, and the motor drives the transmission shaft through a belt drive. The speed of the motor ω d and the rotation speed ω of the cylinder t The relationship is: d =c×ω t .

10. The drum washing machine according to any one of claims 1 or 2, characterized in that: The controller is also configured to obtain operating parameters of the drum washing machine according to the mass m of the clothes in the drum, wherein the operating parameters include washing time, washing intensity, washing water consumption, and water intake time.

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