Control method for a laundry treatment apparatus

Abstract

The present application relates to the technical field of smart home appliances, and specifically provides a control method for a clothes processing device, aiming to solve the problem that the existing clothes processing device cannot determine the reason for shutdown after running or failure, or wastes resources due to being in standby state all the time. To this end, the control method comprises the following steps: in the case that the clothes processing device stops running, obtaining the reason for the clothes processing device stopping running; according to the reason, selectively controlling the clothes processing device to enter different sleep states; in the case that the clothes processing device enters the sleep state, detecting whether there is a user within a preset range; according to the detection result, selectively activating a light display member and displaying the reason for the clothes processing device stopping running to prompt the user, and avoiding the clothes processing device being in standby state all the time, reducing energy consumption, and thus improving user experience.

Description

Technical Field

[0001] This invention relates to the field of smart home appliance technology, specifically providing a control method for clothing processing equipment. Background Technology

[0002] Washing machines are common household appliances for washing clothes. Based on washing methods, they can be broadly classified into top-loading washing machines and front-loading washing machines. As people's living standards improve, they expect washing machines to become more intelligent. To meet user needs, washing machines are equipped with notification modules that send alerts to the user when the machine finishes running or malfunctions, and automatically shut down after a preset time interval, or keep the washing machine in standby mode.

[0003] However, in actual use, when the washing machine issues a notification, the user may not receive it in time and therefore fail to check the washing machine's status. By the time the user checks, the washing machine may already be off, making it impossible to determine whether the shutdown was due to a normal running cycle or a malfunction. Alternatively, the washing machine may be in standby mode, requiring the control board to remain powered, resulting in energy waste and negatively impacting the user experience.

[0004] Therefore, there is a need in the art for a new control method and garment processing equipment to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, namely, the automatic shutdown of existing garment processing equipment after operation or malfunction, which leaves users unable to determine the reason for shutdown or results in the equipment remaining in standby mode and wasting resources, this invention provides a control method for garment processing equipment, the garment processing equipment including a display component; the control method includes the following steps: when the garment processing equipment stops operating, obtaining the reason for the shutdown; selectively controlling the garment processing equipment to enter different sleep states based on the reason; when the garment processing equipment enters a sleep state, detecting whether there is a user within a preset range; and selectively activating and displaying the reason for the shutdown of the garment processing equipment based on the detection result.

[0006] In the preferred embodiment of the above control method, the step of "selectively controlling the clothing processing equipment to enter different sleep states according to the reason" specifically includes: if the clothing processing equipment stops operating due to the end of normal operation, then the clothing processing equipment is controlled to enter the first sleep state.

[0007] In the preferred embodiment of the above control method, the clothing processing device further includes a main control board chip, a power module, and a detection component for detecting whether there is a user within the preset range; the step of "controlling the clothing processing device to enter a first sleep state" specifically includes: controlling the main control board chip to enter a first low power state; controlling the power module to supply power only to the detection component, so that all other components except the detection component are in a non-working state.

[0008] In the preferred embodiment of the above control method, the step of "selectively controlling the clothing processing equipment to enter different sleep states according to the reason" further includes: if the clothing processing equipment stops operating due to a fault, then controlling the clothing processing equipment to enter a second sleep state.

[0009] In the preferred embodiment of the above control method, the clothing processing device further includes a main control board chip, a power module, and a detection component for detecting whether there is a user within the preset range; the step of "controlling the clothing processing device to enter a second sleep state" specifically includes: obtaining the fault type; determining the target component that can play a protective role based on the fault type; controlling the main control board chip to enter a second low-power state; controlling the power module to supply power only to the target component and the detection component, so that all other components except the target component and the detection component are in a non-working state.

[0010] In the preferred embodiment of the above control method, the step of "selectively activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating according to the detection result" specifically includes: if there is a user within the preset range, then the display component is activated and the reason why the clothing processing equipment stopped operating is displayed.

[0011] In the preferred embodiment of the above control method, the step of "activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating" specifically includes: if the clothing processing equipment stopped operating due to the end of normal operation, then the display component is controlled to display the end, so as to prompt the user that the clothing processing equipment has finished operating and to take out the clothing.

[0012] In the preferred embodiment of the above control method, the step of "activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating" further includes: if the clothing processing equipment stopped operating due to a fault, controlling the display component to display a fault code to prompt the user to handle the fault, and controlling the power module to stop supplying power to the target component.

[0013] In the preferred embodiment of the above control method, the step of "selectively activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating according to the detection result" further includes: if there is no user within the preset range, then the display component is not activated and lit.

[0014] In the preferred embodiment of the above control method, the step of "detecting whether there is a user within the preset range" specifically includes: detecting whether there is a user within the preset range through the detection component.

[0015] In a preferred embodiment of the control method of the present invention, when the washing machine stops running, the reason for the washing machine stopping is obtained; based on the reason, the washing machine is selectively controlled to enter different sleep states; when the washing machine enters a sleep state, it is detected whether there is a user within a preset range; based on the detection result, the display component is selectively activated and the reason for the washing machine stopping is displayed.

[0016] Compared to existing technologies where washing machines automatically shut down or remain in standby mode after operation or malfunction, this invention selectively controls the washing machine to enter different sleep states based on the reason for stopping operation. This avoids the washing machine remaining in standby mode and reduces energy consumption. Furthermore, when the washing machine enters sleep mode, based on the detection results of whether there is a user within a preset range, the display component is selectively activated to display the reason for the washing machine stopping operation, providing a prompt to the user. Especially when the washing machine automatically shuts down due to a malfunction, it can promptly prompt the user to handle the fault. Alternatively, when the washing machine automatically shuts down after operation, it can promptly allow the user to remove the clothes, preventing clothes from being piled up in the washing machine for a long time, causing wrinkles or bacterial growth, thereby improving the user experience.

[0017] Furthermore, if the washing machine stops operating due to the end of normal operation, the system controls the washing machine to enter a first sleep state. For example, the main control board chip is controlled to enter a first low-power state, reducing energy consumption. The power module is also controlled to supply power only to the detection component and not to other components, so that only the detection component is in working state while other components are in non-working state, further reducing energy consumption. Moreover, it ensures that in the washing machine sleep state, it can promptly detect whether the user has entered the preset range, thereby promptly activating the display component to inform the user of the reason why the washing machine stopped operating.

[0018] Furthermore, if the washing machine stops operating due to a malfunction, the system controls the washing machine to enter a second sleep state. For example, the main control board chip is controlled to enter a second low-power state, reducing energy consumption. The power module is also controlled to supply power only to the detection and target components, and not to other components, so that only the target and detection components are in working condition, further reducing energy consumption. Moreover, it ensures that even in the washing machine's sleep state, it can promptly detect whether the user has entered the preset range, thereby promptly activating the display component to inform the user of the reason why the washing machine stopped operating. In addition, since the target component is also in working condition, safety accidents caused by the failure to handle the malfunction in a timely manner are avoided.

[0019] Furthermore, if there is a user within the preset range, indicating that the user wants to observe the operation of the washing machine, the display component will be automatically activated and lit up, and the reason why the washing machine stopped running will be displayed, so that the user can understand whether the washing machine stopped running due to the end of normal operation or due to a malfunction, thereby improving the user experience.

[0020] Furthermore, if there are no users within the preset range, it means that no user wants to observe the operation of the washing machine. In this case, the display component will not be activated and will remain in a non-working state, thus avoiding energy waste and improving the user experience. Attached Figure Description

[0021] The control method of the present invention will now be described with reference to the accompanying drawings and in conjunction with a washing machine, in which:

[0022] Figure 1 This is the main flowchart of the control method of the present invention;

[0023] Figure 2 This is a flowchart of the control method of selectively controlling a washing machine to enter different sleep states according to the present invention;

[0024] Figure 3 This is a flowchart of the control method for controlling a washing machine to enter a first sleep state according to the present invention;

[0025] Figure 4 This is a flowchart of the control method for controlling a washing machine to enter a second sleep state according to the present invention;

[0026] Figure 5 This is a flowchart of the control method of selectively activating and lighting up the display component and displaying the reason according to the present invention;

[0027] Figure 6 This is a logic diagram of the control method of the present invention. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although this application is described in conjunction with a washing machine, the technical solution of the present invention is not limited thereto. This control method can obviously also be applied to other clothing processing equipment such as dryers, washer-dryer combos, shoe washing machines, and garment care machines, and such modifications do not depart from the principles and scope of the present invention.

[0029] It should be noted that in the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Based on the technical problems mentioned in the background art, the present invention provides a control method for a washing machine, which aims to selectively control the washing machine to enter different sleep states according to the reason for the washing machine stopping operation, thereby avoiding the washing machine from being in standby mode and reducing energy consumption. Moreover, when the washing machine enters the sleep state, based on the detection results of whether there is a user within a preset range, the display component is selectively activated and illuminated to display the reason for the washing machine stopping operation, providing a prompt to the user. In particular, when the washing machine automatically shuts down due to a malfunction, it can promptly prompt the user to handle the malfunction. Alternatively, when the washing machine automatically shuts down due to the end of operation, it can promptly allow the user to remove the clothes, avoiding the clothes from being piled up in the washing machine for a long time, causing wrinkles or bacteria growth, thereby improving the user experience.

[0032] The washing machine of the present invention will be described first.

[0033] The washing machine of the present invention includes a cabinet, a washing tub, a drive motor, a drain motor, a water level sensor, a camera, a drain valve, a water inlet valve, a main control board chip, a power module, and display components, detection components, etc., disposed in the cabinet, as well as a door, a door lock, and other components pivotally connected to the front panel of the cabinet.

[0034] See next. Figure 1 The control method of the present invention will be described below. Figure 1 This is the main flowchart of the control method of the present invention.

[0035] like Figure 1 As shown, the control method of the present invention includes the following steps:

[0036] S100. When the washing machine stops running, obtain the reason why the washing machine stopped running;

[0037] S200. Depending on the reason, selectively control the washing machine to enter different sleep states;

[0038] S300: When the washing machine enters sleep mode, detect whether there is a user within a preset range;

[0039] S400: Based on the test results, selectively activate and illuminate the display component to show the reason why the washing machine stopped running.

[0040] The reasons why a washing machine stops running may be due to the completion of its normal operation, or due to a malfunction, such as water inlet timeout, drainage timeout, lid opening alarm, spin-drying imbalance, or the impeller failing to drive the inner drum. Of course, the washing machine may also stop running due to accidental operation.

[0041] The different sleep states include a first sleep state and a second sleep state. The first sleep state corresponds to the washing machine stopping operation due to the end of normal operation, while the second sleep state corresponds to the washing machine stopping operation due to a malfunction. The components in the working state corresponding to the first sleep state and the second sleep state are different, as detailed in steps S221 to S222 and steps S231 to S234 below. Of course, the number and classification of sleep states are not limited to the two listed above, and can be adjusted and set according to the reason why the washing machine stops operating. For example, the sleep state can also include a third sleep state, which corresponds to the washing machine stopping operation due to misoperation.

[0042] The preset range can be 1m, 1.5m or 2m away from the washing machine, and those skilled in the art can flexibly adjust and set the preset range.

[0043] In step S300, the detection component detects whether there is a user within the preset range.

[0044] Furthermore, the detection component can be a radar sensor, an infrared sensor, or a laser sensor. Regardless of the type of sensor used to detect whether there is a user within the preset range, the specific detection method corresponding to any sensor should not limit the present invention.

[0045] The following reference Figures 2 to 4Taking the washing machine stopping operation due to the end of normal operation and a malfunction, and the first sleep state and the second sleep state as examples, the control method of selectively controlling the washing machine to enter different sleep states according to the present invention is described. Figure 2 This is a flowchart of the control method of selectively controlling a washing machine to enter different sleep states according to the present invention; Figure 3 This is a flowchart of the control method for controlling a washing machine to enter a first sleep state according to the present invention; Figure 4 This is a flowchart of the control method for controlling the washing machine to enter a second sleep state according to the present invention.

[0046] like Figure 2 As shown, step S200, "selectively controlling the washing machine to enter different sleep states based on the reason," specifically includes:

[0047] S211. If the washing machine stops running due to the end of normal operation, control the washing machine to enter the first hibernation state.

[0048] like Figure 3 As shown, step S211, the step of "controlling the washing machine to enter the first sleep state" specifically includes:

[0049] S221, Control the main control board chip to enter the first low power state;

[0050] S222, The control power module supplies power only to the detection component, so that all other components are in a non-working state.

[0051] The first low-power state is when the main control board chip only controls the power module to supply power to the detection component.

[0052] In steps S221 and S222, since the washing machine stops running after normal operation, the washing machine is controlled to enter the first sleep state corresponding to this reason. At this time, the main control board chip is controlled to enter the first low-power state, that is, the power module is only controlled to supply power to the detection component, thus reducing energy consumption. The power module is also controlled to supply power only to the detection component, and not to other components such as the drive motor, drain motor, water level sensor, camera, drain valve, inlet valve, display component, detection component, and door lock. This ensures that only the detection component is in working state, while other components are in non-working state, further reducing energy consumption. Moreover, it ensures that in the washing machine sleep state, it can detect in time whether the user has entered the preset range, so that the display component can be activated in time to indicate to the user the reason why the washing machine stopped running.

[0053] Continue reading Figure 2 In step S200, the step of "selectively controlling the washing machine to enter different sleep states according to the reason" further includes:

[0054] S212. If the washing machine stops running due to a malfunction, control the washing machine to enter a second sleep state.

[0055] like Figure 4 As shown, step S212, the step of "controlling the washing machine to enter the second sleep state" specifically includes:

[0056] S231. Obtain the fault type;

[0057] S232. Based on the type of fault, determine the target component that can provide protection;

[0058] S233, control the main control board chip to enter the second low power state;

[0059] S234. The control power module supplies power only to the target component and the detection component, so that all other components are in a non-working state.

[0060] The second low-power state is when the main control board chip only controls the power module to supply power to the detection component and the target component.

[0061] In step S232, the target component is determined based on the fault type. For example, if it is a water inlet timeout fault, in order to prevent flooding in the user's home, a drainage operation needs to be performed to drain the water from the washing tub, and the target component is the drainage motor. If it is a drainage timeout fault, in order to prevent the door from being suddenly opened and causing washing water to leak from the inlet, the door needs to be locked, and the target component is the door lock. If it is a lid opening alarm fault, the washing tub stops running. In order to prevent the washing tub from leaking due to prolonged water storage, a drainage operation needs to be performed to drain the water from the washing tub, and the target component is the drainage motor.

[0062] In steps S233 and S234, since the washing machine stops operating due to a malfunction, the washing machine is controlled to enter a second sleep state corresponding to this cause. At this time, the main control board chip is controlled to enter a second low-power state, that is, the power module is only controlled to supply power to the detection component and the target component (such as the drain motor and door lock listed in step S232), thus reducing energy consumption. The power module is also controlled to supply power only to the detection component and the target component, and not to other components such as the drive motor, water level sensor, camera, drain valve, inlet valve, display component, and detection component. This ensures that only the target component and the detection component are in working state, while other components are in non-working state, further reducing energy consumption. Moreover, it ensures that in the washing machine sleep state, it can detect in time whether the user has entered the preset range, so that the display component can be activated in time to indicate to the user the reason why the washing machine stopped operating.

[0063] Furthermore, since the target components are also in operation, for example, in the event of a water inlet timeout fault, the drain motor is in operation, which can drain the water in the washing tub and prevent flooding in the user's home; similarly, in the event of a drain timeout fault, the door lock is in operation, which can lock the door and prevent the washing water from leaking out of the inlet if the door is suddenly opened; and similarly, in the event of a lid opening alarm fault, the drain motor is in operation, which can drain the water in the washing tub and prevent the washing tub from leaking due to prolonged water storage. This avoids safety accidents caused by faults not being dealt with in a timely manner, thereby improving the user experience.

[0064] It should be noted that the fault types and corresponding target components listed above are merely illustrative and not restrictive. In practical applications, those skilled in the art can flexibly adjust and set the fault types and corresponding target components according to the specific fault type, the potential safety accidents, and the necessary preventive measures.

[0065] It should also be noted that in the above process, steps S211 and S212 are not sequential but parallel, and are only related to the reason why the washing machine stops running. The corresponding steps can be executed according to different reasons.

[0066] The following reference Figure 5 The control method of the present invention for selectively activating and illuminating the display component and displaying the reason why the washing machine stops running is described herein. Figure 5 This is a flowchart of the control method of selectively activating and lighting up the display component and displaying the reason according to the present invention.

[0067] like Figure 5 As shown, step S400, "selectively activating and lighting the display component and displaying the reason why the washing machine stopped running based on the detection results," specifically includes:

[0068] S411. If there are no users within the preset range, the display component will not be activated.

[0069] S412. If there are users within the preset range, activate the display component and display the reason why the washing machine stopped running.

[0070] In step S411, if there are no users within the preset range, for example, the preset range is a range of 1.5m away from the washing machine, and no users are detected within this range, it means that no user wants to observe the operation of the washing machine. In this case, the display component is not activated and is kept in a non-working state, thus avoiding energy waste and improving the user experience. Then, the process returns to step S300 until a user is detected within the preset range.

[0071] In step S412, if there is a user within a preset range, for example, a range of 1.5m from the washing machine, and a user is detected within this range, it means that the user wants to observe the operation of the washing machine. In this case, the display component is automatically activated and the reason for the washing machine stopping is displayed, so that the user can understand whether the washing machine stopped running due to the end of normal operation or due to a malfunction, thereby improving the user experience.

[0072] For example, if the washing machine stops running due to the end of normal operation, the control display will show "End" to prompt the user that the washing machine has finished running and that the clothes should be removed.

[0073] For example, if the washing machine stops running due to a malfunction, the control display will show a fault code to prompt the user to troubleshoot the problem. For example, fault codes E1 indicate drainage timeout, E2 indicate lid opening alarm fault, E3 indicate spin-dry imbalance, and E4 indicate water inlet timeout.

[0074] Furthermore, since the user has already received the fault message and needs to troubleshoot the washing machine, there is no need to perform preventative protection on the washing machine. Therefore, the control power module stops supplying power to the target component. For example, it stops supplying power to the drain motor listed in step S223, causing the drain motor to stop draining; or it stops supplying power to the door lock listed in step S223, causing the door lock to be in the unlocked state, so that the door can be opened.

[0075] It should be noted that the preset ranges and fault codes listed above are merely illustrative and not restrictive. Those skilled in the art can flexibly adjust and set the preset ranges and fault codes according to actual usage needs.

[0076] It should also be noted that in the above process, steps S411 and S412 are not sequential but parallel, and are only related to whether there are user detection results within the preset range. The corresponding steps can be executed according to different detection results.

[0077] The following reference Figure 6 This paper describes one possible control flow of the present invention. Figure 6 This is a logic diagram of the control method of the present invention.

[0078] like Figure 6 As shown, a possible complete flow of the control method of the present invention is as follows:

[0079] S501. When the washing machine stops running, obtain the reason why the washing machine stopped running;

[0080] If the washing machine stops running due to the end of normal operation, proceed to step S502;

[0081] If the washing machine stops operating due to a malfunction, proceed to step S504;

[0082] S502, controls the main control board chip to enter the first low-power state;

[0083] S503, The control power module only supplies power to the detection component, so that all other components except the detection component are in a non-working state;

[0084] S504, Obtain the fault type;

[0085] S505. Based on the type of fault, determine the target component that can provide protection.

[0086] S506 controls the main control board chip to enter the second low-power state;

[0087] S507, The control power module supplies power only to the target component and the detection component, so that all other components except the target component and the detection component are in a non-working state;

[0088] After steps S503 and S507, step S508 is executed;

[0089] S508. Detect whether there is a user within the preset range; if yes, proceed to step S509; if no, proceed to step S510 and return to step S508 until there is a user within the preset range.

[0090] S509. Activate and illuminate the display component to show the reason why the washing machine stopped running;

[0091] S510, Do not activate the display component.

[0092] It should be noted that the above embodiments are merely preferred embodiments of the present invention, used only to illustrate the principle of the method of the present invention, and are not intended to limit the scope of protection of the present invention. In practical applications, those skilled in the art can allocate the above functions to different steps as needed, that is, further decompose or combine the steps in the embodiments of the present invention. For example, the steps in the above embodiments can be combined into one step, or further divided into multiple sub-steps to complete all or part of the functions described above. The names of the steps involved in the embodiments of the present invention are merely for distinguishing the various steps and are not considered as limitations on the present invention.

[0093] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a garment processing device, characterized in that, The clothing handling device includes a display component, a power module, and a detection component for detecting whether a user is within a preset range; the control method includes the following steps: In the event that the garment processing equipment stops operating, obtain the reason why the garment processing equipment stops operating; Based on the aforementioned reasons, the clothing processing equipment can be selectively controlled to enter different sleep states; When the clothing processing equipment enters a sleep state, it detects whether there is a user within a preset range; Based on the test results, the display component is selectively activated and illuminated to display the reason why the clothing processing equipment has stopped operating; The step of "selectively controlling the clothing processing equipment to enter different sleep states based on the stated reasons" specifically includes: If the garment processing equipment stops operating due to the end of normal operation, the equipment is controlled to enter a first sleep state; and the power module is controlled to supply power only to the detection component, so that all other components are in a non-working state. If the garment processing equipment stops operating due to a malfunction, the equipment is controlled to enter a second sleep state; and the power module is controlled to supply power only to the target component and the detection component that can play a protective role, so that all other components except the target component and the detection component are in a non-working state.

2. The control method according to claim 1, characterized in that, The garment processing equipment also includes a main control board chip; The steps of "controlling the garment processing equipment to enter the first sleep state" specifically include: Control the main control board chip to enter the first low-power state; The power module is controlled to supply power only to the detection component, so that all other components are in a non-working state.

3. The control method according to claim 1, characterized in that, The garment processing equipment also includes a main control board chip; The steps of "controlling the garment processing equipment to enter a second sleep state" specifically include: Obtain the fault type; The target component is determined based on the fault type; Control the main control board chip to enter the second low-power state; The power module is controlled to supply power only to the target component and the detection component, so that all other components are in a non-operating state.

4. The control method according to any one of claims 1 to 3, characterized in that, The step of "selectively activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating, based on the test results" specifically includes: If there is a user within the preset range, the display component is activated and the reason why the clothing processing equipment has stopped operating is displayed.

5. The control method according to claim 4, characterized in that, The steps of "activating and lighting up the display component and displaying the reason why the clothing processing equipment has stopped operating" specifically include: If the clothing processing device stops operating due to the end of normal operation, the display component is controlled to display an end message to prompt the user that the clothing processing device has finished operating and the clothing should be removed.

6. The control method according to claim 4, characterized in that, The step of "activating and lighting up the display component and displaying the reason why the clothing processing equipment has stopped operating" further includes: If the garment processing equipment stops operating due to a malfunction, the display component is controlled to display a fault code to prompt the user to handle the fault, and the power module is controlled to stop supplying power to the target component.

7. The control method according to any one of claims 1 to 3, characterized in that, The step of "selectively activating and lighting the display component and displaying the reason why the clothing processing equipment stopped operating, based on the test results" further includes: If there are no users within the preset range, the display component will not be activated.

8. The control method according to claim 2 or 3, characterized in that, The steps for "detecting whether there are users within the preset range" specifically include: The detection component detects whether there are users within the preset range.

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