System and associated method for preventing overfilling in a dishwasher

Patent metadata

Field	Value
Publication number	US-9565987-B2
Application number	US-201414497918-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Jun 30, 2010
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A method, system, and computer-program product for preventing overfilling in a dishwasher are disclosed herein. According to one embodiment, a method for preventing overfilling in a dishwasher is provided, wherein the dishwasher includes a water valve for providing water to the dishwasher and a drain pump for removing water from the dishwasher. The method comprises detecting an overfill condition in the dishwasher with at least one detection device, wherein the overfill condition corresponds to a water level in the dishwasher that is greater than a predetermined threshold. The method further includes controlling the drain pump and the water valve in response to detecting the overfill condition in order to facilitate removal of the overfill condition.

First claim

That which is claimed:

1. A method for preventing overfilling in a dishwasher, wherein the dishwasher comprises a water valve configured to provide water to the dishwasher and a drain pump configured to remove water from the dishwasher, the method comprising:
detecting an overfill condition in the dishwasher with at least one detection device, the overfill condition corresponding to a water level in the dishwasher that is greater than a predetermined threshold;
executing a pump-out cycle in response to detecting the overfill condition, wherein the pump-out cycle comprises actuating the drain pump and deactuating the water valve in order to facilitate removal of the overfill condition;
determining if the overfill condition has been removed; and
executing at least one error routine to diagnose an error in at least one component of the dishwasher in response to determining that the overfill condition has not been removed, wherein executing the at least one error routine comprises executing a drain pump/detection device error routine comprising:
determining, in response to determining that the overfill condition has not been removed, if water is present in the dishwasher with a sensing device following execution of the pump-out cycle for a predetermined period of time.

2. The method according to claim 1 , wherein executing the pump-out cycle comprises executing the pump-out cycle: i.) until the overfill condition is removed, or ii.) for a predetermined amount of time.

3. The method according to claim 1 further comprising deactuating the drain pump when the overfill condition is removed.

4. The method according to claim 1 , wherein executing the at least one error routine further comprises executing a water valve error routine, the water valve error routine comprising:
determining if a threshold number of consecutive overfill conditions have been detected; and
executing, in response to determining that the threshold number of consecutive overfill conditions has been detected, an ongoing pump-out cycle until the overfill condition is removed.

5. The method according to claim 4 , wherein executing the water valve error routine further comprises:
determining a flow rate of the water through the water valve and an elapsed time between successive pump-out cycles; and
setting the ongoing pump-out cycle to correspond to the flow rate of the water through the water valve and the elapsed time between successive pump-out cycles.

6. The method according to claim 4 , wherein executing the water valve error routine further comprises providing a water valve error signal in response to determining that the threshold number of consecutive overfill conditions has been detected.

7. The method according to claim 1 , wherein the drain pump/detection device error routine further comprises providing a detection device error signal in response to sensing no water in the dishwasher.

8. The method according to claim 1 , wherein the drain pump/detection device error routine further comprises providing a drain pump error signal in response to sensing the presence of water in the dishwasher.

9. The method according to claim 1 , wherein the determining step comprises determining whether water is present in the dishwasher with a sensing device comprising a turbidity sensor.

10. The method according to claim 1 , wherein executing the at least one error routine further comprises executing a clog error routine, the clog error routine comprising:
executing the pump-out cycle for a predetermined period of time; and
determining if the overfill condition has been removed after the predetermined period of time.

11. The method according to claim 10 , wherein the clog error routine further comprises providing a drain filter error signal or a drain hose error signal in response to determining that the overfill condition has not been removed after the predetermined period of time.

12. The method according to claim 1 , wherein the detecting step comprises detecting an overfill condition with at least one detection device comprising a float and a float switch, wherein the float is movable in relation to the float switch such that the float switch is configured to be actuated when the float is activated by an overfill condition.

13. The method according to claim 12 , wherein detecting comprises detecting an overfill condition with at least one magnetically actuated reed switch configured to be actuated in response to movement of a magnet associated with the float.

14. A system for preventing overfilling in a dishwasher, the system comprising:
a water valve configured to provide water to the dishwasher;
a drain pump configured to remove water from the dishwasher;
at least one detection device configured to detect an overfill condition in the dishwasher, the overfill condition corresponding to a water level in the dishwasher that is greater than a predetermined threshold; and
a control device configured to execute a pump-out cycle in response to detecting the overfill condition, wherein the pump-out cycle comprises actuating the drain pump and deactuating the water valve in order to facilitate removal of the overfill condition, wherein the control device is further configured to determine if the overfill condition has been removed and execute at least one error routine to diagnose an error in at least one component of the dishwasher in response to determining that the overfill condition has not been removed, wherein the at least one error routine comprises executing a drain pump/detection device error routine comprising:
determining, in response to determining that the overfill condition has not been removed, if water is present in the dishwasher with a sensing device following execution of the pump-out cycle for a predetermined period of time.

15. The system according to claim 14 , wherein the at least one detection device comprises a float and a float switch, wherein the float is movable in relation to the float switch such that the float switch is configured to be actuated when the float is activated by an overfill condition.

16. The system according to claim 15 , wherein the float switch comprises at least one magnetically actuated reed switch configured to be actuated in response to movement of a magnet associated with the float.

17. The system according to claim 14 further comprising a turbidity sensor for sensing the presence of water in the dishwasher and communicating with the control device.

18. The system according to claim 14 , wherein the drain pump/detection device error routine further comprises providing a detection device error signal in response to sensing no water in the dishwasher.

19. The system according to claim 14 , wherein the drain pump/detection device error routine further comprises providing a drain pump error signal in response to sensing the presence of water in the dishwasher.

20. A computer program product for preventing overfilling in a dishwasher, wherein the dishwasher comprises a water valve configured to provide water to the dishwasher and a drain pump configured to remove water from the dishwasher, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
a first executable portion configured to detect an overfill condition in the dishwasher with at least one detection device, the overfill condition corresponding to a water level in the dishwasher that is greater than

Assignees

• Electrolux Home Prod Inc

Inventors

• Poyner Dennis A
• Mitchell Glen
• Duckworth Jason
• Defilippi John
• Francisco Virgil J

Classifications

• A47L2401/22

  Number of operational cycles · CPC title

• A47L2501/04

  Water pressure or flow rate · CPC title

• A47L15/4223

  Devices for water discharge, e.g. devices to prevent siphoning, non-return valves · CPC title

• Y10T137/0318

  Processes · CPC title

• A47L2501/01

  Water supply, e.g. opening or closure of the water inlet valve · CPC title