Domestic dishwasher with a sorption drying device and corresponding method

• US 9,610,003 B2
• Filed: 08/07/2009
• Issued: 04/04/2017
• Est. Priority Date: 08/27/2008
• Status: Active Grant

• Current Assignee: BSH Hausgeraete GmbH (Robert Bosch GmbH)
• Original Assignee: BSH Hausgeraete GmbH (Robert Bosch GmbH)
• Inventors: Heidel, Andreas, Krnzle, Bernd, Wolf, Christian
• Primary Examiner(s): Barr, Michael
• Assistant Examiner(s): Shahinian, Levon J
• Application Number:
  US13/058,879
• Publication Number:
  US 20110146718A1
• Time in Patent Office: 2,797 Days
• Field of Search: 134 58 D
• CPC Class Codes: A47L 15/0034 Drying phases, including dripping-off phases
• 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 15/46 Devices for the automatic control of the different phases of cleaning ; Controlling devices A47L15/449 takes precedence
• CPC Class Codes: A47L 15/481 by using water absorbent materials, e.g. Zeolith
• CPC Class Codes: A47L 2401/18 Air temperature
• CPC Class Codes: A47L 2401/30 Variation of electrical, magnetical or optical quantities
• CPC Class Codes: A47L 2501/11 Air heaters
• CPC Class Codes: A47L 2501/12 Air blowers

Abstract

A domestic dishwasher is provided, which has a main controller, a sorption drying device, and an additional controller to specifically control an electrical component of the sorption drying device.

Claims

1. A domestic dishwasher, comprising:

a main controller;

a sorption drying device having electrical components including a fan and a heater; and

an additional controller configured to specifically control the sorption drying device, the additional controller being functionally separate from the main controller,

wherein the additional controller is configured to change the sorption drying device to a safe mode when a failure of the main controller is detected, and

only after a predetermined run-on time has elapsed, the additional controller is configured to switch off the fan of the sorption drying device after the heater of the sorption drying device has been switched off.

2. The domestic dishwasher of claim 1, wherein the additional controller is a component of the main controller.

3. The domestic dishwasher of claim 1, wherein the additional controller is a separate functional component and spatially separated from the main controller.

4. The domestic dishwasher of claim 3, wherein the additional controller is spatially separated from the main controller by a predetermined spatial distance.

5. The domestic dishwasher of claim 3, wherein the additional controller is arranged at a minimum distance from the sorption drying device.

6. The domestic dishwasher of claim 1, further comprising:

a washing container having a base; and

a base module below the base of the washing container;

wherein at least one of the main controller and the additional controller are accommodated in the base module below the base of a washing container.

7. The domestic dishwasher of claim 1, wherein the sorption drying device has a sorption container with reversibly dehydratable sorption material.

8. The domestic dishwasher of claim 1, further comprising a control line to connect the additional controller to the main controller.

9. The domestic dishwasher of claim 8, wherein the additional controller has watchdog supervision logic to check the functional integrity of the control line during activation of the sorption drying device in at least one of a respective sorption drying process and desorption process.

10. The domestic dishwasher of claim 9, wherein the main controller consecutively sends the watchdog supervision logic of the additional controller a plurality of switch-on commands over the control line.

11. The domestic dishwasher of claim 10, wherein the main controller cyclically repeats at least one of the plurality of switch-on commands.

12. The domestic dishwasher of claim 10, wherein the watchdog supervision logic of the additional controller has one of a clock and a timer which determines an upper limit for a wait time between respective receive clock times of each two consecutively-sent switch-on commands.

13. The domestic dishwasher of claim 12, wherein the watchdog supervision logic of the additional controller monitors whether the upper limit for the wait time without receipt of a next switch-on command is exceeded.

14. The domestic dishwasher of claim 13, wherein the additional controller switches off the heater if the watchdog supervision logic determines that the upper limit for the wait time without receipt of the next switch-on command is exceeded.

15. The domestic dishwasher of claim 9, wherein the watchdog supervision logic of the additional controller is configured to supervise the functional integrity of the control line if the heater is switched on for desorbing sorption material of the sorption drying device.

16. The domestic dishwasher of claim 1, further comprising a washing container;

wherein the sorption drying device has a sorption container; and

wherein the additional controller is configured to switch off the sorption drying device when a critical limit temperature is exceeded in at least one of the interior of the washing container and the area of the sorption container.

17. The domestic dishwasher of claim 16, wherein the additional controller is configured to switch off the heater when the critical limit temperature is exceeded in the at least one of the interior of the washing container and the area of the sorption container.

18. The domestic dishwasher of claim 16, further comprising a thermal protection unit disposed in the sorption container, wherein the thermal protection unit interrupts power to the sorption drying device when temperature in the sorption container exceeds an upper limit temperature.

19. The domestic dishwasher of claim 1, wherein the additional controller is configured to switch off the sorption drying device when a critical characteristic value of an electrical energy supply network, with which at least one of the main controller and the additional controller is actively connected, is exceeded in at least one of a respective sorption process and a desorption process.

20. The domestic dishwasher of claim 19, wherein the critical characteristic value is at least one of a main voltage deviation and a mains frequency deviation of the electrical energy supply network.