DISPENSING CUP MONITORING FOR A DISHWASHER APPLIANCE

Abstract

A dishwasher appliance includes a door pivotally mounted to a cabinet to provide selective access to a wash chamber, a dispensing assembly including a dispenser cup, a dispenser door for providing selective access to the dispenser cup, and an actuating mechanism for moving the dispenser door from a closed position to an open position, and a magnetic sensing assembly operably coupled to the dispensing assembly. A controller is configured to energize the actuating mechanism, obtain a signal from the magnetic sensing assembly, determine that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly, and implement a responsive action in response to determining that the dispensing assembly has malfunctioned.

Claims

1. A dishwasher appliance defining a vertical direction, a lateral direction, and a transverse direction, the dishwasher appliance comprising: a wash tub positioned within a cabinet and defining a wash chamber; a door pivotally mounted to the cabinet to provide selective access to the wash chamber; a dispensing assembly comprising a dispenser cup, a dispenser door for providing selective access to the dispenser cup, and an actuating mechanism for moving the dispenser door from a closed position to an open position; a magnetic sensing assembly operably coupled to the dispensing assembly; and a controller in operative communication with the dispensing assembly and the magnetic sensing assembly, the controller being configured to: energize the actuating mechanism; obtain a signal from the magnetic sensing assembly; determine that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly; and implement a responsive action in response to determining that the dispensing assembly has malfunctioned.

2. The dishwasher appliance of claim 1, wherein the magnetic sensing assembly comprises: a magnet; and a magnet sensor.

3. The dishwasher appliance of claim 2, wherein the magnet sensor is mounted on the dispenser cup and the magnet is mounted on the dispenser door.

4. The dishwasher appliance of claim 2, wherein the magnet sensor is triggered when the dispenser door moves toward the closed position.

5. The dishwasher appliance of claim 2, wherein the magnet sensor is a Hall-Effect sensor.

6. The dishwasher appliance of claim 5, wherein the Hall-Effect sensor is a linear Hall-Effect sensor, and the controller is further configured to: determine a magnetic field strength using the Hall-Effect sensor; and determine a door position of the dispenser door based at least in part on the magnetic field strength.

7. The dishwasher appliance of claim 2, wherein the magnet sensor is a reed switch.

8. The dishwasher appliance of claim 1, wherein determining that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly comprises determining that the dispenser door is in the closed position after energizing the actuating mechanism.

9. The dishwasher appliance of claim 1, wherein the controller is further configured to: monitor a current draw by the actuating mechanism; determine that the current draw matches an expected current signature; and determine that the dispenser door is stuck.

10. The dishwasher appliance of claim 1, wherein the controller is further configured to: monitor a current draw by the actuating mechanism; determine that the current draw does not match an expected current signature; and determine that the actuating mechanism has malfunctioned.

11. The dishwasher appliance of claim 1, wherein the actuating mechanism comprises a solenoid selectively engaging a latch that secures the dispenser door in the closed position.

12. The dishwasher appliance of claim 1, wherein implementing the responsive action comprises: providing a user notification that the dispensing assembly has malfunctioned.

13. The dishwasher appliance of claim 12, wherein the user notification is provided through a user interface panel.

14. The dishwasher appliance of claim 12, wherein the controller is in operative communication with a remote device through an external network, and wherein the user notification is provided through the remote device.

15. A method of operating a dishwasher appliance, the dishwasher appliance comprising a dispensing assembly comprising a dispenser cup, a dispenser door for providing selective access to the dispenser cup, and an actuating mechanism for moving the dispenser door from a closed position to an open position, the dishwasher appliance further comprising a magnetic sensing assembly operably coupled to the dispensing assembly, the method comprising: energizing the actuating mechanism; obtaining a signal from the magnetic sensing assembly; determining that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly; and implementing a responsive action in response to determining that the dispensing assembly has malfunctioned.

16. The method of claim 15, wherein the magnetic sensing assembly comprises a magnet and a linear Hall-Effect sensor, the method further comprising: determining a magnetic field strength using the Hall-Effect sensor; and determining a door position of the dispenser door based at least in part on the magnetic field strength.

17. The method of claim 15, wherein determining that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly comprises determining that the dispenser door is in the closed position after energizing the actuating mechanism.

18. The method of claim 15, further comprising: monitoring a current draw by the actuating mechanism; determining that the current draw matches an expected current signature; and determining that the dispenser door is stuck.

19. The method of claim 15, further comprising: monitoring a current draw by the actuating mechanism; determining that the current draw does not match an expected current signature; and determining that the actuating mechanism has malfunctioned.

20. The method of claim 15, wherein implementing the responsive action comprises: providing a user notification that the dispensing assembly has malfunctioned.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures.

[0010] FIG. 1 provides a perspective view of a dishwasher appliance, including a dishwasher door according to an example embodiment of the present disclosure.

[0011] FIG. 2 provides a cross-sectional side view of the exemplary dishwashing appliance of FIG. 1 according to an example embodiment of the present disclosure.

[0012] FIG. 3 provides a front view of the exemplary dishwashing appliance of FIG. 1 with a door open according to an example embodiment of the present disclosure.

[0013] FIG. 4 provides an elevation view of a dispensing assembly on the exemplary door of the dishwasher appliance of FIG. 1 according to an example embodiment of the present subject matter.

[0014] FIG. 5 provides a rear view of the example dispensing assembly of FIG. 4 according to an example embodiment of the present subject matter.

[0015] FIG. 6 provides a schematic representation of an optical sensing assembly that may be used with the example dispensing assembly of FIG. 4 according to an example embodiment of the present subject matter.

[0016] FIG. 7 provides a schematic representation of a photo-interrupter assembly that may be used with the example dispensing assembly of FIG. 4 according to an example embodiment of the present subject matter.

[0017] FIG. 8 provides a plot of a magnetic field strength measured by a magnetic sensing assembly an example embodiment of the present subject matter.

[0018] FIG. 9 illustrates a method for operating a dishwasher appliance in accordance with one embodiment of the present disclosure.

[0019] FIG. 10 provides a flow diagram of a dispenser door diagnostic method according to an example embodiment of the present subject matter.

[0020] Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the present invention.

DETAILED DESCRIPTION

[0021] Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.

[0022] As used herein, the terms first, second, and third may be used interchangeably to distinguish one component from another and are not intended to signify location or importance of the individual components. The terms includes and including are intended to be inclusive in a manner similar to the term comprising. Similarly, the term or is generally intended to be inclusive (i.e., A or B is intended to mean A or B or both). The term at least one of in the context of, e.g., at least one of A, B, and C refers to only A, only B, only C, or any combination of A, B, and C. In addition, here and throughout the specification and claims, range limitations may be combined and/or interchanged. Such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise. For example, all ranges disclosed herein are inclusive of the endpoints, and the endpoints are independently combinable with each other. The singular forms a, an, and the include plural references unless the context clearly dictates otherwise.

[0023] Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as generally, about, approximately, and substantially, are not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value, or the precision of the methods or machines for constructing or manufacturing the components and/or systems. For example, the approximating language may refer to being within a 10 percent margin, i.e., including values within ten percent greater or less than the stated value. In this regard, for example, when used in the context of an angle or direction, such terms include within ten degrees greater or less than the stated angle or direction, e.g., generally vertical includes forming an angle of up to ten degrees in any direction, e.g., clockwise or counterclockwise, with the vertical direction V.

[0024] The word exemplary is used herein to mean serving as an example, instance, or illustration. In addition, references to an embodiment or one embodiment does not necessarily refer to the same embodiment, although it may. Any implementation described herein as exemplary or an embodiment is not necessarily to be construed as preferred or advantageous over other implementations. Moreover, each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.

[0025] Aspects of the present subject matter are generally directed to systems and methods for detecting the status of a dispensing door of a dishwasher. In this regard, one or more sensors may be used to provide feedback regarding the position of the dispenser door, e.g., whether it is opened or closed. The sensor state can be used in conjunction with a dispense cup solenoid current measurement.

[0026] For example, when the dispense cup is closed, the sensor will output the CLOSED state. During a cycle, if the dispense door does not open, bit-mapping can show that the OPEN state was requested, but the sensors output state will show the door is not open. Furthermore, the solenoid power draw signature can be used to narrow down the potential root cause. For example, if the current signature is normal, then the door may be stuck or obstructed. By contrast, if the current signature is abnormal, then the solenoid subsystem may be faulty.

[0027] According to an example embodiment, the sensor used to detect the position of the door may be an analog magnetic sensor. Specifically, the incorporation of a magnetic sensor and magnet can provide direct feedback on the dispense cup door position. A Linear Hall Effect sensor may be assembled onto the dispense cup body, and a magnet may be assembled onto the dispense cup door. The magnet is close to the sensor when the dispense cup is closed and far from the sensor when open. The Linear Hall Effect sensor may output an analog signal corresponding to the strength of the detected magnetic field. The output signal may increase as the magnet moves closer to the sensor and decrease as the magnet moves further from the sensor. This control algorithm may use the signal to pinpoint the precise position of the dispense door, whether open, partially open, or closed. The direction of travel can also be determined.

[0028] According to an example embodiment, the sensor used to detect the position of the door may be a digital magnetic sensor. Specifically, a magnetic sensor may be assembled onto the dispense cup body, and a magnet may be assembled onto the dispense cup door. The magnet may be positioned close to the sensor when the dispense cup is closed and far from the sensor when open. The magnetic sensor can be a Hall effect sensor or a reed switch. The sensor may output a 2-state signal corresponding to the presence or absence of a magnetic field. These two states indicate whether the dispense cup door is closed or open. The magnet may be placed such that it is close to the sensor when the door is closed. The sensors "Magnetic Field Present" output indicates the door closed position. When the door opens, the magnet moves away from the sensor, and the sensors output changes to "Magnetic Field Absent," indicating the door open position. Alternatively, a reed switch sensor can be attached to the dispense cup. A magnet may be assembled onto the dispense cup door, positioned close to the sensor when the dispense cup is closed and far from the sensor when open. The reed sensor functions as a switch with two states: closed when the magnet is close and open when the magnet is far. These two states correspond to the dispense cup door being closed or open.

[0029] According to an example embodiment, the sensor used to detect the position of the door may be a photo-sensor. Specifically, a dedicated IR source and receiver may be assembled to the dispense cup body. The IR source and receiver may be constructed of discrete components or combined in a single sensor package. An optically transmissive area of the dispenser cup allows the IR source light to be transmitted to the dispense cup door. A reflective target feature on the dispense cup door reflects IR source light when the door is fully or partially closed. The IR receiver may output a 2-state signal: one state if reflected light is received, and the other state if no reflected light is received. These states correspond to the door being closed and the door being open, respectively. The IR source is activated and transmits through the clear section of the dispense cup. If the door is closed, the source light will be reflected back to the receiver, and the sensor will indicate that the door is CLOSED. If the dispense cup door is fully open, the source light will not be reflected by the target on the door, and the sensor will indicate that the door is OPEN. The clear and reflective features may be designed such that a partially open door still reflects some light, causing the sensor to indicate that the door is CLOSED.

[0030] According to an example embodiment, the sensor used to detect the position of the door may be a photo-interrupter. Specifically, incorporating an LED, phototransistor, and mechanical features on the dispense cup door may provide direct feedback on the dispense cup door position. A dedicated LED (source) and phototransistor (receiver) with an air gap in between may be assembled to the dispense cup body. The source and receiver may be combined into a single unit or constructed of discrete components. Additionally, a mechanical feature added to the dispense cup door may be designed to pass between the source and receiver as the dispense cup door moves. The light beam can thus be either unobstructed or obstructed by the mechanical feature. The sensor may output a 2-state signal corresponding to the light source being obstructed or unobstructed. The control interprets these states as Door Open and Door Closed. When the dispense cup door is open, the target moves away, and the light source is unobstructed; the phototransistor receives the light and sets its output such that the control interprets that the door is OPEN. When the door is closed, the target obstructs the light source; the phototransistor does not receive the light and sets its output such that the control interprets that the door is CLOSED. Prior to the cycle starting, the sensor can detect an open dispense cup door; this can be used to alert the consumer to check the dispense cup and to add soap and/or close the cup.

[0031] FIGS. 1 and 2 depict an exemplary domestic dishwashing appliance or dishwasher 100 that may be configured in accordance with aspects of the present disclosure. For the particular embodiment of FIGS. 1 and 2, the dishwasher 100 includes a cabinet 102 having a tub 104 therein that defines a wash chamber 106. As shown, tub 104 extends between a top 107 and a bottom 108 along a vertical direction V, between a pair of side walls 110 along a lateral direction L, and between a front side 111 and a rear side 112 along a transverse direction T. Each of the vertical direction V, lateral direction L, and transverse direction T are mutually orthogonal to one another.

[0032] The tub 104 includes a front opening 114 and a door 116 hinged at its bottom for movement between a normally closed vertical position (shown in FIG. 2), wherein the wash chamber 106 is sealed shut for washing operation, and a horizontal open position for loading and unloading of articles from the dishwasher 100. According to exemplary embodiments, dishwasher 100 further includes a door closure mechanism or assembly 118 that is used to lock and unlock door 116 for accessing and sealing wash chamber 106.

[0033] As illustrated in FIG. 2, tub side walls 110 may accommodate a plurality of rack assemblies. More specifically, guide rails 120 may be mounted to side walls 110 for supporting a lower rack assembly 122, a middle rack assembly 124, and an upper rack assembly 126. As illustrated, upper rack assembly 126 is positioned at a top portion of wash chamber 106 above middle rack assembly 124, which is positioned above lower rack assembly 122 along the vertical direction V. Each rack assembly 122, 124, 126 is adapted for movement between an extended loading position (not shown) in which the rack is substantially positioned outside the wash chamber 106, and a retracted position (shown in FIGS. 1 and 2) in which the rack is located inside the wash chamber 106. This is facilitated, for example, by rollers 128 mounted onto rack assemblies 122, 124, 126, respectively. Although a guide rails 120 and rollers 128 are illustrated herein as facilitating movement of the respective rack assemblies 122, 124, 126, it should be appreciated that any suitable sliding mechanism or member may be used according to alternative embodiments.

[0034] Some or all of the rack assemblies 122, 124, 126 are fabricated into lattice structures including a plurality of wires or elongated members 130 (for clarity of illustration, not all elongated members making up rack assemblies 122, 124, 126 are shown in FIG. 2). In this regard, rack assemblies 122, 124, 126 are generally configured for supporting articles within wash chamber 106 while allowing a flow of wash fluid to reach and impinge on those articles (e.g., during a cleaning or rinsing cycle). According to another exemplary embodiment, a silverware basket (not shown) may be removably attached to a rack assembly (e.g., lower rack assembly 122) for placement of silverware, utensils, and the like, that are otherwise too small to be accommodated by rack 122.

[0035] Dishwasher 100 further includes a plurality of spray assemblies for urging a flow of water or wash fluid onto the articles placed within wash chamber 106. More specifically, as illustrated in FIG. 2, dishwasher 100 includes a lower spray arm assembly 134 disposed in a lower region 136 of wash chamber 106 and above a sump 138 so as to rotate in relatively close proximity to lower rack assembly 122. Similarly, a mid-level spray arm assembly 140 is located in an upper region of wash chamber 106 and may be located below and in close proximity to middle rack assembly 124. In this regard, mid-level spray arm assembly 140 may generally be configured for urging a flow of wash fluid up through middle rack assembly 124 and upper rack assembly 126. Additionally, an upper spray assembly 142 may be located above upper rack assembly 126 along the vertical direction V. In this manner, upper spray assembly 142 may be configured for urging or cascading a flow of wash fluid downward over rack assemblies 122, 124, and 126. As further illustrated in FIG. 2, upper rack assembly 126 may further define an integral spray manifold 144, which is generally configured for urging a flow of wash fluid substantially upward along the vertical direction V through upper rack assembly 126.

[0036] The various spray assemblies and manifolds described herein may be part of a fluid distribution system or fluid circulation assembly 150 for circulating water and wash fluid in the tub 104. More specifically, fluid circulation assembly 150 includes a pump 152 for circulating water or wash fluid (e.g., detergent, water, or rinse aid) in the tub 104. Pump 152 may be located within sump 138 or within a machinery compartment located below sump 138 of tub 104, as generally recognized in the art. Fluid circulation assembly 150 may include one or more fluid conduits or circulation piping for directing water or wash fluid from pump 152 to the various spray assemblies and manifolds. For example, as illustrated in FIG. 2, a primary supply conduit 154 may extend from pump 152, along rear 112 of tub 104 along the vertical direction V to supply wash fluid throughout wash chamber 106.

[0037] As illustrated, primary supply conduit 154 is used to supply wash fluid to one or more spray assemblies (e.g., to mid-level spray arm assembly 140 and upper spray assembly 142). However, it should be appreciated that according to alternative embodiments, any other suitable plumbing configuration may be used to supply wash fluid throughout the various spray manifolds and assemblies described herein. For example, according to another exemplary embodiment, primary supply conduit 154 could be used to provide wash fluid to mid-level spray arm assembly 140 and a dedicated secondary supply conduit (not shown) could be utilized to provide wash fluid to upper spray assembly 142. Other plumbing configurations may be used for providing wash fluid to the various spray devices and manifolds at any location within dishwasher appliance 100.

[0038] Each spray arm assembly 134, 140, 142, integral spray manifold 144, or other spray device may include an arrangement of discharge ports or orifices for directing wash fluid received from pump 152 onto dishes or other articles located in wash chamber 106. The arrangement of the discharge ports, also referred to as jets, apertures, or orifices, may provide a rotational force by virtue of wash fluid flowing through the discharge ports. Alternatively, spray arm assemblies 134, 140, 142 may be motor-driven, or may operate using any other suitable drive mechanism. Spray manifolds and assemblies may also be stationary. The resultant movement of the spray arm assemblies 134, 140, 142 and the spray from fixed manifolds provides coverage of dishes and other dishwasher contents with a washing spray. Other configurations of spray assemblies may be used as well. For example, dishwasher 100 may have additional spray assemblies for cleaning silverware, for scouring casserole dishes, for spraying pots and pans, for cleaning bottles, etc. One skilled in the art will appreciate that the embodiments discussed herein are used for the purpose of explanation only and are not limitations of the present subject matter.

[0039] In operation, pump 152 draws wash fluid in from sump 138 and pumps it to a diverter assembly 156 (e.g., which may be positioned within sump 138 of dishwasher appliance 100). Diverter assembly 156 may include a diverter disk (not shown) disposed within a diverter chamber 158 for selectively distributing the wash fluid to the spray arm assemblies 134, 140, 142 or other spray manifolds or devices. For example, the diverter disk may have a plurality of apertures that are configured to align with one or more outlet ports (not shown) at the top of diverter chamber 158. In this manner, the diverter disk may be selectively rotated to provide wash fluid to the desired spray device.

[0040] According to an exemplary embodiment, diverter assembly 156 is configured for selectively distributing the flow of wash fluid from pump 152 to various fluid supply conduits, only some of which are illustrated in FIG. 2 for clarity. More specifically, diverter assembly 156 may include four outlet ports (not shown) for supplying wash fluid to a first conduit for rotating lower spray arm assembly 134 in the clockwise direction, a second conduit for rotating lower spray arm assembly 134 in the counter-clockwise direction, a third conduit for spraying an auxiliary rack such as the silverware rack, and a fourth conduit for supply mid-level or upper spray assemblies 140, 142 (e.g., such as primary supply conduit 154).

[0041] The dishwasher 100 is further equipped with a controller 160 to regulate operation of the dishwasher 100. The controller 160 may include one or more memory devices and one or more microprocessors, such as general or special purpose microprocessors operable to execute programming instructions or micro-control code associated with a cleaning cycle. The memory may represent random access memory such as DRAM, or read only memory such as ROM or FLASH. In one embodiment, the processor executes programming instructions stored in memory. The memory may be a separate component from the processor or may be included onboard within the processor. Alternatively, controller 160 may be constructed without using a microprocessor (e.g., using a combination of discrete analog or digital logic circuitry, such as switches, amplifiers, integrators, comparators, flip-flops, AND gates, and the like) to perform control functionality instead of relying upon software.

[0042] The controller 160 may be positioned in a variety of locations throughout dishwasher 100. In the illustrated embodiment, the controller 160 may be located within a control panel area 162 of door 116, as shown in FIGS. 1 and 2. In such an embodiment, input/output (I/O) signals may be routed between the control system and various operational components of dishwasher 100 along wiring harnesses that may be routed through the bottom of door 116. Typically, the controller 160 may be in operative communication with a user interface panel 164 through which a user may select various operational features and modes and monitor progress of the dishwasher 100. In one embodiment, the user interface 164 may represent a general purpose I/O (GPIO) device or functional block. In certain embodiments, the user interface 164 includes input components 166, such as one or more of a variety of electrical, mechanical or electro-mechanical input devices including capacitive touch screens/buttons, rotary dials, push buttons, and touch pads. The user interface 164 may further include one or more display components 168, such as a digital display device or one or more indicator light assemblies designed to provide operational feedback to a user. The user interface 164 may be in communication with the controller 160 via one or more signal lines or shared communication busses.

[0043] It should be appreciated that the invention is not limited to any particular style, model, or configuration of dishwasher 100. The exemplary embodiment depicted in FIGS. 1 and 2 is for illustrative purposes only. For example, different locations may be provided for user interface 164, different configurations may be provided for rack assemblies 122, 124, 126, different spray arm assemblies 134, 140, 142 and spray manifold configurations may be used, and other differences may be applied while remaining within the scope of the present subject matter. Moreover, aspects of the present subject matter may be applied to other appliances as well, such as refrigerators, ovens, microwaves, etc.

[0044] Referring now generally to FIGS. 1 and 2, door 116 will be described according to exemplary embodiments of the present subject matter. Although door 116 is described herein as being used with dishwasher 100, it should be appreciated that door 116 or variations thereof may be used on any other suitable residential or commercial appliance. As described herein, door 116 may share a coordinate system with dishwasher 100, e.g., when door 116 is in the closed position (e.g., as shown in FIG. 2). Specifically, door 116 may define a vertical direction V, a lateral direction L, and a transverse direction T. Therefore, these directions may be used herein to refer to features of door 116 and its various components and sub-assemblies.

[0045] As shown, in the normally closed position, door 116 extends from a top end or top edge 180 to a bottom end or bottom edge 182 along the vertical direction V; from a front end 184 to a rear end 186 along the transverse direction T; and between two lateral ends 188 along the lateral direction L. According to exemplary embodiments, door 116 may be formed from one or more exterior panels that define an interior chamber of door 116. According to exemplary embodiments, the exterior panels of door 116 may be panels that are stamped from stainless steel or may be formed from any other suitably rigid material, such as thermoformed plastic, other metals, etc. In general, the exterior panels of door 116 may be assembled in any suitable manner, e.g., may be secured together using any suitable mechanical fastener, welding, snap-fit mechanisms, etc. In addition, it should be appreciated that an insulating material (not shown), such as fiberglass or foam insulation, may be positioned within door 116 to provide thermal and/or sound insulation to dishwasher 100.

[0046] Referring still to FIGS. 1 and 2, user interface panel 164 is positioned proximate top edge 180 of door 116 along the vertical direction V. In this manner, user interface panel 164 may be partially hidden below a countertop when dishwasher appliance 100 is installed below the countertop and door 116 is closed. Accordingly, dishwasher appliance 100 may be referred to as a top control dishwasher appliance. However, it should be appreciated that aspects of the present subject matter may be used with dishwasher appliances having other configurations or any other suitable appliance. For example, user interface panel 164 may be alternately positioned on front face or front end 184 of door 116.

[0047] User interface panel 164 is positioned on door 116 such that a user can engage or interact with user interface panel 164, e.g., to select operating cycles and parameters, activate/deactivate operating cycles, or adjust other operating parameters of dishwasher appliance 100. User interface panel 164 may include a printed circuit board (not shown) that is positioned within door 116. According to exemplary embodiments, printed circuit board may include or be operatively coupled to controller 160 and/or user interface panel 164. In addition, user interface panel 164 may include or be operably coupled to one or more user inputs or touch buttons (e.g., identified generally herein as user inputs 166) for receiving user input, providing user notifications, or illuminating to indicate cycle or operating status.

[0048] Specifically, according to the illustrated embodiment, user inputs 166 include a plurality of capacitive sensors that are mounted to user interface panel 164 and are operable to detect user inputs. For example, these capacitive sensors may be configured for triggering when a user touches a top edge 180 of user interface panel 164 in a region associated with a particular user input 166. In particular, these capacitive sensors can detect when a finger or another conductive material with a dielectric different than air contacts or approaches user interface panel 164, along with the precise location, pressure, etc. of the finger interaction.

[0049] When a user touches top edge 180 of user interface panel 164 adjacent one of user inputs 166, the associated capacitive sensors may be triggered and may communicate a corresponding signal to controller 160. In such a manner, operations of dishwasher appliance 100 can be initiated and controlled. According to exemplary embodiments, the capacitive sensors may be distributed laterally on user interface panel 164. It will be understood that other any suitable number, type, and position of capacitive sensors may be used while remaining within the scope of the present subject matter. Indeed, any suitable number, type, and configuration of user inputs 166 may be used while remaining within the scope of the present subject matter.

[0050] User interface panel 164 may define a plurality of surfaces that are intended to be illuminated for various purposes. For example, user inputs 166 may beilluminated by light sources to inform the user of the location of the button or to provide some other status indication. Notably, this illumination is typicallyachieved by directing a light beam along the vertical direction V onto top edge 180 of user interface panel 164. Door 116 may further include a plurality of lightsources or lighting devices that are configured for illuminating one or more surfaces of user interface panel 164. It should be appreciated that these light sourcesmay include any suitable number, type, configuration, and orientation of light sources mounted at any suitable location to illuminate status indicators or buttons inany suitable colors, sizes, patterns, etc. In other words, the light sources may be provided as any suitable number, type, position, and configuration of electricallight source(s), using any suitable light technology and illuminating in any suitable color. For example, the light sources may include one or more light emittingdiodes (LEDs), which may each illuminate in a single color (e.g., white LEDs), or which may each illuminate in multiple colors (e.g., multi-color or RGB LEDs)depending on the control signal from controller 160.

[0051] However, it should be appreciated that according to alternative embodiments, the light sources may include any other suitable traditional light bulbs or sources, such as halogen bulbs, fluorescent bulbs, incandescent bulbs, glow bars, a fiber light source, etc. Moreover, the light sources may be operably coupled (e.g., electrically coupled) to controller 160 or another suitable control board to facilitate activation or illumination of the light sources (e.g., to indicate a user input, state of the dishwasher appliance, state of the wash cycle, or any other relevant information to a user).

[0052] According to exemplary embodiments, user interface panel 164 may be any suitable transparent or semitransparent feature for diffusing, directing, or otherwise transmitting light from a light source. For example, user interface panel 164 may be formed from a suitable transparent or translucent material configured to direct light energy, such as a dielectric material, such as glass or plastic, polycarbonate, polypropylene, polyacrylic, or any other suitable material.

[0053] In addition, user interface panel 164 may be a dead fronted panel. As used herein, the term dead front and the like is generally intended to refer to portions of a control panel which may be used as indicators, buttons, interactive control surfaces, or other user-interaction features without exposing the user to the operating side of the equipment or live parts and connections, i.e., lights, electrical connections, etc. For example, user interface panel 164 may include a transparent or translucent body and an opaque masking material that is selectively printed on top edge 180 of the translucent body to define capacitive touch buttons or user inputs 166.

[0054] The opaque material may be deposited on the translucent body to define any suitable number, size, and configuration of illuminated features. These illuminated features may be shapes or include other forms such as symbols, words, etc. that are visible on user interface panel 164. More specifically, when light sources are energized, capacitive touch buttons or user inputs 166 on top edge 180 may be illuminated. Thus, the dead fronted top edge 180 may be the surface that is contacted for controlling dishwasher appliance 100 or which may be illuminated for purposes of indicating operating status or other conditions to the user of the dishwasher appliance 100.

[0055] Referring still to FIG. 1, a schematic diagram of an external communication system 190 will be described according to an exemplary embodiment of the present subject matter. In general, external communication system 190 is configured for permitting interaction, data transfer, and other communications between dishwasher appliance 100 and one or more external devices. For example, this communication may be used to provide and receive operating parameters, user instructions or notifications, performance characteristics, user preferences, or any other suitable information for improved performance of dishwasher appliance 100. In addition, it should be appreciated that external communication system 190 may be used to transfer data or other information to improve performance of one or more external devices or appliances and/or improve user interaction with such devices.

[0056] For example, external communication system 190 permits controller 160 of dishwasher appliance 100 to communicate with a separate device external to dishwasher appliance 100, referred to generally herein as an external device 192. As described in more detail below, these communications may be facilitated using a wired or wireless connection, such as via a network 194. In general, external device 192 may be any suitable device separate from dishwasher appliance 100 that is configured to provide and/or receive communications, information, data, or commands from a user. In this regard, external device 192 may be, for example, a personal phone, a smartphone, a tablet, a laptop or personal computer, a wearable device, a smart home system, or another mobile or remote device.

[0057] In addition, a remote server 196 may be in communication with dishwasher appliance 100 and/or external device 192 through network 194. In this regard, for example, remote server 196 may be a cloud-based server 196, and is thus located at a distant location, such as in a separate state, country, etc. According to an exemplary embodiment, external device 192 may communicate with a remote server 196 over network 194, such as the Internet, to transmit/receive data or information, provide user inputs, receive user notifications or instructions, interact with or control dishwasher appliance 100, etc. In addition, external device 192 and remote server 196 may communicate with dishwasher appliance 100 to communicate similar information.

[0058] In general, communication between dishwasher appliance 100, external device 192, remote server 196, and/or other user devices or appliances may be carried using any type of wired or wireless connection and using any suitable type of communication network, non-limiting examples of which are provided below. For example, external device 192 may be in direct or indirect communication with dishwasher appliance 100 through any suitable wired or wireless communication connections or interfaces, such as network 194. For example, network 194 may include one or more of a local area network (LAN), a wide area network (WAN), a personal area network (PAN), the Internet, a cellular network, any other suitable short- or long-range wireless networks, etc. In addition, communications may be transmitted using any suitable communications devices or protocols, such as via Wi-Fi, Bluetooth, Zigbee, wireless radio, laser, infrared, Ethernet type devices and interfaces, etc. In addition, such communication may use a variety of communication protocols (e.g., TCP/IP, HTTP, SMTP, FTP), encodings or formats (e.g., HTML, XML), and/or protection schemes (e.g., VPN, secure HTTP, SSL).

[0059] External communication system 190 is described herein according to an exemplary embodiment of the present subject matter. However, it should be appreciated that the exemplary functions and configurations of external communication system 190 provided herein are used only as examples to facilitate description of aspects of the present subject matter. System configurations may vary, other communication devices may be used to communicate directly or indirectly with one or more associated appliances, other communication protocols and steps may be implemented, etc. These variations and modifications are contemplated as within the scope of the present subject matter.

[0060] Referring now to FIGS. 3 through 5, dishwasher appliance 100 may further include a dispensing assembly 200 that is generally configured for dispensing wash additives into wash chamber 106 to facilitate a cleaning cycle. According to the illustrated embodiment, dispensing assembly 200 may be mounted to rear end 186 of door 116. Although an exemplary dispensing assembly 200 is described below for use with dishwasher appliance 100, it should be appreciated that variations and modifications may be made to dispensing assembly 200 while remaining within the scope of the present subject matter.

[0061] According to the illustrated embodiment, dispensing assembly 200 may generally include a dispenser cup 202 that defines a reservoir 204 for receiving a wash additive, e.g., such as detergent, rinse aid, or any other suitable additive. In addition, dispensing assembly 200 may include a dispenser door 206 that is generally movable between an open position and a closed position to provide selective access to reservoir 204. For example, a user typically loads reservoir 204 with wash additive, e.g., such as a detergent pod or liquid/powdered detergent, closes dispenser door 206, closes door 116, and initiates an operating cycle. Dispensing assembly 200 may further include an actuating mechanism 208 that is generally configured for moving dispenser door 206 from the closed position to the open position. In this regard, controller 160 may be in operative communication with actuating mechanism 208 and may operate actuating mechanism 208 to open dispenser door 206 at a desired time during the cleaning cycle.

[0062] According to an example embodiment, dispenser door 206 may be biased toward the open position (as shown in FIG. 4), e.g., using a mechanical spring or other resilient element. Dispensing assembly 200 may further include a latch 210 that secures dispenser door 206 in the closed position. In this manner, after a user adds detergent to reservoir 204, they may pivot dispenser door 206 to the closed position (as shown in FIG. 3), overcoming the force of the mechanical spring until latch 210 engages to secure dispenser door 206 in the closed position. Actuating mechanism 208 may include a solenoid 212 that disengages latch 210 upon receiving a command from controller 160, thereby causing dispenser door 206 to pivot into the open position.

[0063] Under normal operation, latch 210 may disengage dispenser door 206 and the mechanical spring urges dispenser door 206 to the open position. Notably, in the event of a dispensing assembly 200 failure, dispenser door 206 may not open. As a result, a cleaning cycle may be performed without detergent, resulting in poor cleaning performance and user dissatisfaction. Dispensing assembly failures may occur for a variety of reasons, such as a dispenser door that is jammed or otherwise prevented from opening, e.g., due to build-up of detergent or other grime. Alternatively, actuating mechanism 208 may fail or a component on controller 160 may fail resulting in a lack of power to actuating mechanism 208. Accordingly, aspects of the present subject matter are generally directed to methods for detecting the failure of dispensing assembly 200 and implementing corrective action.

[0064] For example, controller 160 may include a control board (not shown) that includes relays, transistors, or other electronic components that are configured to provide power to or otherwise actuate actuating mechanism 208. In addition, controller 160 may be capable of monitoring command signals or relays used to regulate actuating mechanism 208 as well as power drawn by actuating mechanism 208. Accordingly, as described in more detail below, controller 160 may monitor the operation of actuating mechanism and may identify the failure of dispensing assembly 200 based at least in part on the operation of actuating mechanism 208.

[0065] Referring now specifically to FIGS. 5 through 7, dishwasher appliance 100 may further include one or more sensing assemblies that may be used to determine a position of dispenser door 206, e.g., fully open, fully closed, or somewhere in between. Although example sensing assemblies are illustrated and described herein, it should be appreciated that variations and modifications may be made to these assemblies while remaining within the scope of the present subject matter.

[0066] For example, referring specifically to FIGS. 4 and 5, the sensing assembly of dishwasher appliance 100 may be a magnetic sensing assembly 220 that is operably coupled to dispensing assembly 200. According to an example embodiment, controller 160 may be operably coupled to magnetic sensing assembly 220 for detecting the position of dispenser door 206. In general, magnetic sensing assembly 220 may include a magnet 222 and a magnet sensor 224 mounted to dispensing assembly 200. Controller 160 may monitor the output of magnet sensor 224 to determine the position of dispenser door 206.

[0067] For example, magnet sensor 224 may be mounted on dispenser cup 202 and magnet 222 may be mounted on dispenser door 206. In this manner, wiring between controller 160 and magnet sensor 224 may be simplified and need not be run through the movable dispenser door 206. For example, magnet sensor 224 may be mounted to a back side 226 of dispenser cup 202, e.g., such that it is concealed from the users visibility and is not accessible once installed. For example, magnet sensor 224 may be embedded in a side of dispenser cup 202, e.g., proximate a bottom of dispenser cup 202 along the vertical direction V (e.g., when door 116 is closed). In addition, magnet 222 may be attached to or embedded in dispenser door 206, e.g., proximate a latching edge 228 of dispenser door 206. In this manner, as dispenser door 206 moves into the closed position, magnet 222 moves into proximity to magnet sensor 224. It should be appreciated that other positions and configurations of magnet 222 and magnet sensor 224 may be used while remaining within the scope of the present subject matter. For example, the position of magnet 222 and magnet sensor 224 may be switched, they be mounted or attached to a door hinge or pivot point, etc.

[0068] In general, magnet sensor 224 may be any suitable sensor, device, or system for detecting a magnetic field emanating from magnet 222. For example, magnet sensor 224 may be a Hall-Effect sensor 230. According to an alternative embodiment, magnet sensor 224 may be a reed switch or any other suitable device for monitoring magnetic fields. In this manner, as dispenser door 206 is moved toward the closed position, magnet 222 may come into close proximity to magnet sensor 224 and controller 160 may determine the position of dispenser door 206 based at least in part on the strength of the magnetic field. It should be appreciated that magnet sensor 224 may be triggered when dispenser door 206 moves toward the closed position or moves toward the open position.

[0069] According to another example embodiment, magnet sensor 224 may be a linear Hall-Effect sensor. In this regard, magnet sensor 224 may return a precise strength of the magnetic field and not just an ON or OFF determination. For example, as shown in FIG. 8, the output voltage of magnet sensor 224 may vary as a function of the magnetic flux density. As magnet 222 comes closer to magnet sensor 224, magnet sensor 224 may output a voltage from which controller 160 may determine the precise position of dispenser door 206.

[0070] Referring specifically to FIG. 6, the sensing assembly of dishwasher appliance 100 may be an optical sensing assembly 240 that is operably coupled to dispensing assembly 200. According to an example embodiment, controller 160 may be operably coupled to optical sensing assembly 240 for detecting the position of dispenser door 206. In general, optical sensing assembly 240 may include a light source 242, a light receiver 244, and a reflective target 246 mounted to dispensing assembly 200. Controller 160 may monitor the output of light receiver 244 to determine the position of dispenser door 206, as described in more detail below.

[0071] In general, light source 242 may be any source of light waves of any suitable wavelength. For example, light source 242 may generate visible light, infrared light, etc. According to an example embodiment, light source 242 is a light emitting diode (LED). Reflective target 246 may be any suitable material that reflects, redirects, or returns at least a portion of the light directed at reflective target 246 by light source 242, such as a mirror, aluminum foil, or any other suitable reflective surface. In addition, light receiver 244 may be any suitable device for sensing the amount of reflected light, e.g., such as a phototransistor, a camera, an optical sensor, etc. In general, controller 160 may control the generation of light from light source 242 and may monitor the reflected light detected by light receiver 244 to determine the position of dispenser door 206.

[0072] According to the illustrated embodiment, light source 242 and light receiver 244 are mounted on dispenser cup 202 and reflective target 246 is mounted on dispenser door 206. In this regard, light source 242 may generate light that is directed toward dispenser door 206 (e.g., in the closed position). If dispenser door 206 is in the closed position, reflective target 246 may be exposed to and reflect the light, which may be detected by light receiver 244. By contrast, if dispenser door 206 is in the open position, reflective target 246 may not be in a location where it reflects light, and controller 160 may thereby determine that dispenser door 206 is in the open position. It should be appreciated that reflective target 246 may be positioned on any surface of dispenser door 206. In addition, according to an example embodiment, reflective target 246 may be positioned behind an optically transparent window 248 (e.g., such as a clear lens) defined on dispenser door 206.

[0073] Referring specifically to FIG. 7, the sensing assembly of dishwasher appliance 100 may be a photo-interrupter assembly 260 that is operably coupled to dispensing assembly 200. According to an example embodiment, controller 160 may be operably coupled to photo-interrupter assembly 260 for detecting the position of dispenser door 206. In general, photo-interrupter assembly 260 may include a light source 262, a light receiver 264, and a photo-interrupter feature 266 that is selectively positioned between the light source and the light receiver. Controller 160 may monitor the output of light receiver 244 to determine the position of dispenser door 206, as described in more detail below.

[0074] According to an example embodiment, light source 262 and light receiver 264 are mounted on dispenser cup 202 and photo-interrupter feature 266 is mounted on dispenser door 206. For example, similar to optical sensing assembly 240 described above, light source 262 may be an infrared light source and light receiver 264 may be a phototransistor. Photo-interrupter feature 266 may be configured to block, break, or otherwise distort the beam of light generated by light source 262 when in a certain position. For example, photo-interrupter feature 266 may be a protrusion 268 extending from dispenser door 206 such that it is positioned between light source 262 and light receiver 264 when dispenser door 206 is in the closed position. In this manner, controller 160 may determine that dispenser door 206 is closed if light source 262 is on and no light is detected at light receiver 264.

[0075] Now that the construction of dishwasher appliance 100 and dispensing assembly 200 according to exemplary embodiments have been presented, an exemplary method 300 of operating a dishwasher appliance will be described. Although the discussion below refers to the exemplary method 300 of operating dishwasher appliance 100, one skilled in the art will appreciate that the exemplary method 300 is applicable to the operation of a variety of other dishwasher appliances and dispensing assemblies.

[0076] In exemplary embodiments, the various method steps as disclosed herein may be performed by controller 160 or a separate, dedicated controller. In this regard, as described herein, controller 160 of dishwasher appliance 100 may implement all steps of method 300. However, it should be appreciated that according to alternative embodiments, controller 160 may offload the analysis described herein, e.g., by transmitting data to remote server 196 for analysis. Other distributed analysis arrangements are possible and within the scope of the present subject matter.

[0077] Referring now to FIG. 9, method 300 includes, at step 310, energizing an actuation mechanism to open a dispenser door of a dispensing assembly of a dishwasher appliance. In this regard, continuing the example from above, at a target time within an operating cycle of dishwasher appliance 100, controller 160 may operate actuating mechanism 208 with the intention of opening dispenser door 206 and injecting detergent into wash chamber 106. This energization may be achieved by actuating a transistor or relay within controller 160 to deliver power to actuating mechanism 208.

[0078] Step 320 generally includes obtaining a signal from a sensing assembly that is operably coupled to the dispensing assembly. In this regard, the sensing assembly may include one or more of magnetic sensing assembly 220, optical sensing assembly 240, and photo-interrupter assembly 260. In this regard, during and immediately after energizing actuation mechanism 208, controller 160 may use the sensing assemblies to identify the position of dispenser door 206 and issues with dispensing assembly 200, such as a jammed dispenser door 206.

[0079] In this regard, step 330 includes determining that the dispensing assembly has malfunctioned based on the signal received from the sensing assembly. For example, determining that the dispensing assembly has malfunctioned based on the signal from the magnetic sensing assembly 220, optical sensing assembly 240, or photo-interrupter assembly 260 may include determining that the dispenser door is in the closed position after energizing the actuating mechanism.

[0080] Step 340 may generally include implementing a responsive action in response to determining that dispensing assembly has malfunctioned. For example, implementing the responsive action may include providing a user notification that dispensing assembly has malfunctioned. This user notification may be communicated to the user in any suitable manner. For example, the user notification may be provided through a user interface panel (such as user interface panel 164), e.g., such as by illuminating a dispensing failure light indicator. According to still other embodiments, the user notification regarding the dispensing failure may be communicated directly to the user through external device 192 (e.g., such as the users cell phone) via network 194. According to still other embodiments, the user notification may be provided to a smart speaker, to another connected appliance, or any other suitable device. In addition, according to example embodiments, method 300 may include communicating with a service technician, scheduling a maintenance service, ordering a new dispenser part, etc.

[0081] According to still other embodiments, method 300 may include determining that dispensing assembly has malfunctioned based at least in part on the power draw, e.g., either alone or in conjunction with the feedback from the sensing assembly. For example, method 330 may include determining that the power draw has increased by a predetermined power threshold relative to the standard power draw. In this regard, method 300 may include monitoring a current draw by the actuating mechanism. If the current draw matches an expected current signature, it may be deduced that the dispenser door is stuck. By contrast, if the current draw does not match the expected current signature, it may be deduced that the actuating mechanism has malfunctioned.

[0082] For example, if solenoid 212 commonly takes 100 milliamps (mA) of current to open dispenser door 206, the solenoid actually draws 100 mA, but the sensing assembly indicates that the door is closed, this may indicate that the door is stuck. By contrast, if the current power draw of solenoid 212 has increased to 200 or 300 mA and the sensing assembly indicates that the door is stuck, this increase in current draw may be sufficient to indicate that there is an issue with opening dispenser door 206, e.g., there is an issue with solenoid 212. According to still other embodiments, method 300 may include determining that an actuator relay is active while also determining that the current draw from the actuating mechanism 208 is zero or minimal. According to such an embodiment, controller 160 may be attempting to actuate solenoid 212 but solenoid 212 is not drawing power, which may be indicative of a faulty electronic component, a bad relay, a faulty wiring harness, etc.

[0083] Referring now to FIG. 10, a flow diagram of a dispenser door diagnostic method 400 will be described according to an example embodiment of the present subject matter. As shown, a dishwashing cycle starts at step 402 and controller reads the dispenser door sensor at step 404 (e.g., using magnetic sensing assembly 220, optical sensing assembly 240, photo-interrupter assembly 260, etc.). Step 406 includes determining whether the door is open, and if it is, step 408 includes alerting the user to close the dispenser door. If the dispenser door is determined to be closed at step 406, the cycle continues at step 410.

[0084] At a target time in the wash cycle, it may be desirable to open the dispenser door to dispense wash additive. Accordingly, step 412 includes requesting that the dispenser door be opened and step 414 includes reading the door sensor. Step 416 once again includes determining whether the door is open, and if it is, step 418 includes finishing the dishwashing cycle. If the door is determined to have not opened, step 420 includes determining whether the dispenser door is completely closed. If it is, step 422 includes checking the current or power supplied to actuating mechanism 208. Step 424 includes determining whether the supplied current is expected or normal for opening the dispenser door. If the current is good, step 426 may include determining that the door is stuck. If the current is not good, step 428 may include determining that there is an issue with the actuating mechanism 208.

[0085] If step 420 results in a determination that the dispenser door is not fully closed, step 430 may include determining that the door is partially open. If the door is determined to be partially opened, step 432 includes checking the current or power supplied to actuating mechanism 208. Step 434 includes determining whether the supplied current is expected or normal for opening the dispenser door. If the current is good, step 436 may include determining that the door is stuck. If the current is not good, step 438 may include determining that there is an issue with the actuating mechanism 208.

[0086] FIGS. 9 and 10 depict steps performed in a particular order for purposes of illustration and discussion. Those of ordinary skill in the art, using the disclosures provided herein, will understand that the steps of any of the methods discussed herein can be adapted, rearranged, expanded, omitted, or modified in various ways without deviating from the scope of the present disclosure. Moreover, although aspects of methods 300 and 400 are explained using dishwasher appliance 100 and dispensing assembly 200 as an example, it should be appreciated that this method may be applied to the operation of any suitable dispensing assembly in any suitable dishwasher appliance.

[0087] This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.