Method and system for removing a clog from a dishwasher

• US 8,702,874 B2
• Filed: 02/08/2011
• Issued: 04/22/2014
• Est. Priority Date: 02/08/2011
• Status: Active Grant

• Current Assignee: Electrolux Consumer Products Incorporated
• Original Assignee: Electrolux Home Products Incorporated (AB Electrolux)
• Inventors: Montgomery, Mark D., Francisco, Virgil J., Lambert, Christopher B., DeFilippi, John
• Primary Examiner(s): Markoff, Alexander
• Application Number:
  US13/022,942
• Publication Number:
  US 20120199162A1
• Time in Patent Office: 1,169 Days
• Field of Search: 134/18, 134/25.2, 134/57.D, 134/56.D, 134/58.D, 137/387
• US Class Current: 134/56.D
• CPC Class Codes: A47L 15/0049 Detection or prevention of malfunction, including accident prevention arrangements to prevent clogging of filters A47L15/4208; safety arrangements for preventing water damage A47L15/421
• CPC Class Codes: A47L 15/4223 Devices for water discharge, e.g. devices to prevent siphoning, non-return valves
• CPC Class Codes: A47L 2401/09 Water level
• CPC Class Codes: A47L 2501/02 Water discharge, e.g. opening or closure of discharge valve
• CPC Class Codes: A47L 2501/05 Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
• CPC Class Codes: A47L 2501/26 Indication or alarm to the controlling device or to the user
• CPC Class Codes: Y10T 137/0424 Liquid cleaning or flushing

Abstract

Embodiments of the present invention are related to a method and an associated system for removing a forming or fully developed clog from a drain hose in a dishwasher. According to one embodiment, the system includes a drain pump configured to remove water from the dishwasher and a drain hose in fluid communication with the drain pump. The system further includes a control device in operable communication with the drain pump and configured to execute a drain routine in response to detecting a clog in the drain hose, wherein the drain routine comprises repeatedly activating and deactivating the drain pump to facilitate removal of the clog.

Claims

1. A method of manufacturing a dishwasher for removing a clog from a drain hose, the method comprising the steps of:

providing a dishwasher comprising;

a drain pump configured to remove water from the dishwasher;

a drain hose in fluid communication with the drain pump;

a detection device configured to detect a clog in the drain hose; and

a control device in operable communication with the drain pump; and

configuring the control device to execute, in response to detecting the clog in the drain hose, a drain routine to facilitate removal of the clog, wherein the drain routine comprises;

activating the drain pump for a first time period;

deactivating the drain pump for a second time period;

repeating activation of the drain pump for the first time period and deactivation of the drain pump for the second time period at least once; and

activating the drain pump for a third time period, wherein the third time period is different than the first time period.

2. The method of claim 1, wherein configuring the control device further comprises configuring the control device to:

determine if the clog has been removed after execution of the drain routine; and

repeat execution of the drain routine if the clog has not been removed.

3. The method of claim 2, wherein configuring the control device further comprises configuring the control device to:

determine if the number of times the drain routine has been performed exceeds a threshold number of times; and

signal a drain clog error if the number of times the drain routine has been performed exceeds the threshold number of times.

4. The method of claim 1, wherein activating the drain pump comprises turning on the drain pump so as to facilitate removal of water from the dishwasher, and wherein deactivating the drain pump comprises pausing the drain pump so to stop removing water from the dishwasher.

10. The method of claim 1, wherein the second time period is shorter than the first time period.

11. The method of claim 10, wherein the second time period is two seconds, and the first time period is ten seconds.

12. The method of claim 1, wherein the third time period is longer than each of the first time period and the second time period.

13. The method of claim 1, wherein the first time period is designed such that water entering the drain hose surrounds the clog, and wherein the second time period is designed to form a first air break downstream of the clog and a second air break upstream of the clog to isolate the water and clog such that the water and the clog shift due to gravity to upset compaction of the clog and release or dislodge soil within the clog.

14. The method of claim 1, wherein the first time period and the second time period are based, at least in part, on the configuration of the drain pump and the drain hose.

15. The method of claim 1, wherein the detection device is configured to detect the clog by determining if a rate of water level change during draining is slower than a threshold rate of water level change during draining.

16. The method of claim 1, wherein the detection device is positioned within a flow path of water draining through the drain hose, and wherein the detection device is configured to detect the clog by determining if water is present in the flow path at a time in which water should not be present in the flow path.

5. A system for removing a clog from a drain hose in a dishwasher, the system comprising:

a drain pump configured to remove water from the dishwasher;

a drain hose in fluid communication with the drain pump;

a detection device configured to detect a clog in the drain hose; and

a control device in operable communication with the drain pump and configured to execute, in response to detecting a clog in the drain hose, a drain routine to facilitate removal of the clog, wherein the drain routine comprises;

activating the drain pump for a first time period;

deactivating the drain pump for a second time period;

repeating activation of the drain pump for the first time period and deactivation of the drain pump for the second time period at least once; and

activating the drain pump for a third time period, wherein the third time period is different than the first time period.

6. The system of claim 5, wherein the control device is configured to:

determine if the clog has been removed after execution of the drain routine; and

repeat execution of the drain routine if the clog has not been removed.

7. The system of claim 6, wherein the control device is further configured to:

determine if the number of times the drain routine has been performed exceeds a threshold number of times; and

signal a drain clog error if the number of times the drain routine has been performed exceeds the threshold number of times.

8. The system of claim 5, wherein the control device is configured to provide a signal to resume operation of the dishwasher upon removal of the clog.

17. The system of claim 5, wherein the second time period is shorter than the first time period.

18. The system of claim 17, wherein the second time period is two seconds, and the first time period is ten seconds.

19. The system of claim 5, wherein the third time period is longer than each of the first time period and the second time period.

20. The system of claim 5, wherein the first time period is designed such that water entering the drain hose surrounds the clog, and wherein the second time period is designed to form a first air break downstream of the clog and a second air break upstream of the clog to isolate the water and clog such that the water and the clog shift due to gravity to upset compaction of the clog and release or dislodge soil within the clog.

21. The system of claim 5, wherein the first time period and the second time period are based, at least in part, on the configuration of the drain pump and the drain hose.

22. The system of claim 5, wherein the detection device is configured to detect the clog by determining if a rate of water level change during draining is slower than a threshold rate of water level change during draining.

23. The system of claim 5, wherein the detection device is positioned within a flow path of water draining through the drain hose, and wherein the detection device is configured to detect the clog by determining if water is present in the flow path at a time in which water should not be present in the flow path.

9. A computer program product for removing a clog from a drain hose in a dishwasher, the dishwasher comprising a drain pump for removing water from the dishwasher and in fluid communication with the drain hose, wherein the dishwasher further comprises a detection device configured to detect a clog in the drain hose, 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 being configured when said program product is run by a control device of the dishwasher, to:

execute, in response to detecting a clog in the drain hose, a drain routine to facilitate removal of the clog, wherein the drain routine comprises;

activating the drain pump for a first time period;

deactivating the drain pump for a second time period;

repeating activation of the drain pump for the first time period and deactivation of the drain pump for the second time period at least once; and

activating the drain pump for a third time period, wherein the third time period is different than the first time period.

24. The computer program product of claim 9, wherein the second time period is shorter than the first time period.

25. The computer program product of claim 24, wherein the second time period is two seconds, and the first time period is ten seconds.

26. The computer program product of claim 9, wherein the third time period is longer than each of the first time period and the time period.

27. The computer program product of claim 9, wherein the first time period is designed such that water entering the drain hose surrounds the clog, and wherein the time period is designed to form a first air break downstream of the clog and a second air break upstream of the clog to isolate the water and clog such that the water and the clog shift due to gravity to upset compaction of the clog and release or dislodge soil within the clog.