Dishwasher and Operating Method for a Dishwasher

• US 20080308127A1
• Filed: 06/17/2005
• Published: 12/18/2008
• Est. Priority Date: 06/22/2004
• Status: Abandoned Application

• Current Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Original Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Inventors: Padtberg, Klaus, Brodowski, Bjorn
• Application Number:
  US11/570,832
• Publication Number:
  US 20080308127A1
• Time in Patent Office: Days
• US Class Current: 134/18
• CPC Class Codes: A47L 15/0057 Cleaning of machines parts, e.g. removal of deposits like lime scale or proteins from piping or tub
• CPC Class Codes: A47L 15/0089 of small size, e.g. portable mini dishwashers for small kitchens, office kitchens, boats, recreational vehicles specially adapted for drinking glasses A47L15/0065
• CPC Class Codes: A47L 15/46 Devices for the automatic control of the different phases of cleaning ; Controlling devices A47L15/449 takes precedence
• CPC Class Codes: A47L 2301/04 Operation mode, e.g. delicate washing, economy washing, reduced time, sterilizing, water softener regenerating, odor eliminating or service
• CPC Class Codes: A47L 2401/20 Time, e.g. elapsed operating time
• CPC Class Codes: A47L 2401/22 Number of operational cycles
• CPC Class Codes: A47L 2401/34 Other automatic detections
• CPC Class Codes: A47L 2501/26 Indication or alarm to the controlling device or to the user
• CPC Class Codes: A47L 2501/34 Change machine operation from normal operational mode into special mode, e.g. service mode, resin regeneration mode, sterilizing mode, steam mode, odour eliminating mode or special cleaning mode to clean the hydraulic circuit

Abstract

A dishwasher (2) has a detecting device (4) for sensing at least one condition indicative of need for self-cleaning of the dishwasher. The detecting device (4) emits a signal in this respect, for example, to an indicating device (6) or to a control device (8). The control device (8) is designed for executing a self-cleaning program, for controlling: a) a device for supplying self-cleaning liquid, b) a circulating pump for circulating the self-cleaning liquid in the dishwasher, for cleaning parts of the same, and c) a device for emptying the self-cleaning liquid from the dishwasher following the self-cleaning operation according to step b).

Claims

1. A dishwasher, characterized by

a detecting device for sensing at least one condition indicative of a need for a self-cleaning of the dishwasher, the detecting device emitting a signal in this respect;

and

a control device for executing a self-cleaning program, the control device operable for controlling

a) a device for supplying self-cleaning liquid,

b) a circulating pump for carrying out a self-cleaning operation by circulating the self-cleaning liquid in the dishwasher, for cleaning parts of the same, and

c) a device for emptying the self-cleaning liquid from the dishwasher following the self-cleaning operation according to step b).

2. The dishwasher according to claim 1, characterized in that the device for emptying the self-cleaning liquid from the dishwasher following the self-cleaning operation according to step b) is a pump.

3. The dishwasher according to claim 1, characterized in that the operation of emptying the self-cleaning liquid from the dishwasher following the self-cleaning operation takes place by gravitational force.

4. The dishwasher according to claim 1, characterized by an indicating device for picking up the signal of the detecting device, the indicating device, on the basis of this signal, emitting an optical and/or acoustic signal for a user, who is thus alerted that self-cleaning of the dishwasher is required.

5. The dishwasher according to claim 1, characterized in that the detecting device has:

a real-time clock and a memory which stores the point in time of the last self-cleaning operation;

a calculating device which, from the point in time of the last self-cleaning operation and a time signal from the real-time clock, calculates a duration which has elapsed since the last self-cleaning operation;

a memory for storing a duration threshold value; and

a time comparator by means of which the duration which has elapsed since the last self-cleaning operation is compared with the duration threshold value and the signal is emitted when the duration which has elapsed since the last self-cleaning operation is equal to or greater than the duration threshold value.

6. The dishwasher according to claim 1, characterized in that the detecting device has:

an elapsed-hour meter and an elapsed-hour resetter which resets the elapsed-hour meter as the self-cleaning program is executed;

a memory for storing an elapsed-hour threshold value;

and an elapsed-hour comparator by means of which a current value of the elapsed-hour meter is compared with the elapsed-hour threshold value and the signal is emitted when the current value of the elapsed-hour meter is equal to or greater than the elapsed-hour threshold value.

7. The dishwasher according to claim 1, characterized in that the detecting device has:

a cycle meter, for counting washing-program cycles, and a cycle resetter which resets the cycle meter as the self-cleaning program is executed;

a memory for storing a cycle threshold value; and

a cycle comparator by means of which a current value of the cycle meter is compared with a cycle threshold value and the signal is emitted when the current value of the cycle meter is equal to or greater than the cycle threshold value.

8. The dishwasher according to claim 1, characterized in that the detecting device contains:

at least one sensor for sensing the degree of contamination of the dishwasher;

a memory for storing a contamination threshold value; and

a contamination comparator (54) by means of which a current value of the degree of contamination is compared with the contamination threshold value and the signal is emitted when the current value of the degree of contamination is equal to or greater than the contamination threshold value.

9. The dishwasher according to claim 1, characterized in that the detecting device is connected for signal transmission to the control device, in order for the signal to be transmitted to the control device, and in that the control device is designed for picking up the signal and executing the self-cleaning program on this basis.

10. The dishwasher according to claim 1, characterized by an operating element for manually causing the control device to start the self-cleaning program.

11. The dishwasher according to claim 1, characterized by a supply section, for accommodating a self-cleaning agent, and a controllable clean-water inlet, for filling the dishwasher with clean water, the control device, for the purpose of supplying the self-cleaning liquid, operating the clean-water inlet, in order to fill the dishwasher with clean water, and operating the circulating pump, in order to circulate the clean water such that the latter, along with the self-cleaning agent, forms the self-cleaning liquid.

12. The dishwasher according to claim 11, characterized in that the supply section is configured for accommodating the self-cleaning agent in tablet form.

13. The dishwasher according to claim 12, characterized by a tank for accommodating washing liquid up to a predetermined level, the supply section being located above the predetermined level in the tank.

14. The dishwasher according to claim 1, characterized in that a pump is provided for pumping away washing liquid, and in that the control device is designed for controlling the pump at the end of a washing program, in which items which are to be washed are treated with the washing liquid, with the result that at least some of the washing liquid normally remains in the dishwasher, and for controlling the pump such that substantially all the washing liquid is pumped away prior to the self-cleaning liquid being supplied.

15. The dishwasher according to claim 1, characterized by a controllable inlet for washing liquid, and in that the control device is configured for controlling the inlet in order for the dishwasher to be filled with washing liquid following removal of the self-cleaning liquid from the dishwasher.

16. A method of operating a dishwasher, characterized by

a detecting method that checks whether at least one predetermined condition indicative of need for self-cleaning of the dishwasher is present, a signal being emitted if the at least one predetermined condition is present;

and

a self-cleaning program that has the following steps;

a) supplying self-cleaning liquid;

b) circulating the self-cleaning liquid in the dishwasher, for cleaning parts of the dishwasher;

c) removing the self-cleaning liquid (84) from the dishwasher following the self-cleaning operation according to step b).

17. The method according to claim 16, characterized in that the signal emitted during the course of the detecting method is picked up by an indicating device, and in that, on this basis, the indicating device emits an optical and/or acoustic signal for a user.

18. The method according to claim 16, characterized in that a duration that has elapsed since the last self-cleaning operation is determined during the course of the detecting method, and in that the signal is emitted when this duration is greater than a pre-stored duration threshold value.

19. The method according to claim 16, characterized in that a number of hours elapsed since the last self-cleaning operation is sensed during the course of the detecting method, and in that the signal is emitted when the number of hours elapsed is greater than a pre-stored elapsed-hour threshold value.

20. The method according to claim 16, characterized in that a number of washing cycles since the last self-cleaning operation is counted during the course of the detecting method, and in that the signal is emitted when the number of washing cycles is greater than a pre-stored cycle threshold value.

21. The method according to claim 16, characterized in that the degree of contamination of the dishwasher is sensed during the course of the detecting method, and the signal is emitted when the degree of contamination is greater than a predetermined contamination threshold value.

22. The method according to claim 16, characterized in that a self-cleaning agent is arranged in a supply section and, for the purpose of supplying the self-cleaning liquid, the machine is filled with the clean water and the clean water is circulated via the supply section in order for the self-cleaning liquid to be formed from the self-cleaning agent and the clean water.

23. The method according to claim 22, characterized in that the self-cleaning agent is supplied in tablet form.

24. The method according to claim 22, characterized in that the self-cleaning agent is supplied in liquid form.

25. The method according to claim 22, characterized in that the self-cleaning agent is supplied in powder form.

26. The method according to claim 16, characterized in that, in order to execute a washing program in which dishes are treated with washing liquid, a tank is filled up to a predetermined level with the washing liquid, in that at least some of the washing liquid is used for executing the washing program a number of times, and in that all the washing liquid is pumped away from the tank prior to the self-cleaning liquid being supplied.

27. The method according to claim 22, characterized in that the supply section is located above the predetermined level of the washing liquid, and in that the self-cleaning agent is arranged in the supply section once the washing program has ended and prior to the washing liquid being pumped away.

28. The method according to claim 16, characterized in that the self-cleaning program contains the following step:

d) filling the dishwasher with washing liquid once the self-cleaning liquid has been pumped away from the dishwasher according to step c).

29. The method according to claim 16, characterized in that the self-cleaning program is executed automatically on account of the signal produced during the course of the detecting method.