Dishwasher collection chamber filter cleaning system

1 . A dishwasher incorporating a cleaning system for removing debris build-up from fine filter surfaces of a debris collection chamber, the dishwasher comprising:

a floor, a sump formed in the floor, and a wash pump having a pump inlet in communication with the sump and a pump discharge, the sump having a bottom;

a collection chamber formed in the bottom of the sump, the collection chamber having an open top and comprising at least one wall, at least part of the at least one wall comprising filter media;

a sprayer disposed within the collection chamber, the sprayer being in fluid communication with the pump and comprising at least one nozzle alignable for spray contact with the filter media; and;

wherein when water is pumped from the sump to the sprayer, the water is sprayed across the filter media to remove any debris thereon.

2 . The dishwasher of claim 1 , further including a drain pump in communication with the collection chamber for drainage of debris from the collection chamber.

3 . The dishwasher of claim 1 wherein the sprayer comprises a conduit extending upwardly from the bottom of the collection chamber.

4 . The dishwasher of claim 3 wherein the conduit comprises a tube.

5 . The dishwasher of claim 4 further including a plurality of spaced apertures formed through the tube.

6 . The dishwasher of claim 5 wherein at least some of the plurality of spaced apertures are vertically spaced.

7 . The dishwasher of claim 1 , further including a flow control device that is selectively positionable to direct at least some of the water to the sprayer.

8 . The dishwasher of claim 1 , further including:

a lower spray arm in communication with the pump; and

an upper spray arm in communication with the pump.

9 . The dishwasher of claim 8 , further including:

a multi-position flow control device downstream of the pump discharge; and

wherein the multi-position flow control valve is selectively positionable to direct the water to at least one of the sprayer, lower spray arm, and upper spray arm.

10 . The dishwasher of claim 9 , wherein the multi-position flow control valve is selectively positionable to direct all the water from the pump to the sprayer.

11 . A method of operating a dishwasher to remove debris build-up from surfaces of a filter disposed in a collection chamber, the method comprising:

pumping filtered water to a sprayer with the collection chamber, the sprayer having a plurality of spaced nozzles aligned toward the filter; and

spraying the filtered water from the nozzles across the filter to remove the debris build-up from the filter.

12 . A method of controlling the flow of circulated, filtered water in a dishwasher having at least one spray arm and a sprayer disposed within a collection chamber of the dishwasher, the method comprising the steps of:

pumping filtered water through a pump;

selectively directing the filtered water to at least one of the sprayer and the at least one spray arm.

13 . The method of claim 12 wherein the at least one spray arm comprises a lower spray; and an upper spray arm.

14 . The method of claim 13 wherein all of the filtered water is directed to the sprayer, to the upper spray arm, or to the lower spray arm.

15 . The method of claim 13 wherein all of the filtered water is directed to at least one of the upper spray arm or the lower spray arm.

16 . The method of claim 12 wherein selectively directing occurs by manipulating a multi-position flow control valve.

17 . The method of claim 12 wherein when all of the filtered water is directed to the sprayer, a higher flow rate is obtained to sweep debris from a primary filter to the collection chamber.