Dishwasher appliance and a method for operating the same

1. A method for operating a dishwasher appliance having a tub with a sump positioned at a bottom portion of the tub, a filter medium within the sump positioned between a filtered volume of the sump and an unfiltered volume of the sump, a spray assembly also positioned within a wash chamber of the tub, the method comprising:

operating a first pump and a second pump of the dishwasher appliance during a wash cycle of the dishwasher appliance, the first pump urging wash fluid from the unfiltered volume of the sump to the wash chamber of the tub during said step of operating, the second pump urging wash fluid from the filtered volume of the sump to the spray assembly during said step of operating;

working the second pump of the dishwasher appliance during a soil collection cycle of the dishwasher appliance such that the second pump urges wash fluid from the filtered volume of the sump to the spray assembly, the first pump of the dishwasher appliance being deactivated during said step of working; and

running the first pump of the dishwasher appliance during a drain cycle of the dishwasher appliance such that the first pump urges wash fluid out of the sump, the second pump of the dishwasher appliance being deactivated during said step of running.

2. The method of claim 1 , further comprising adjusting a valve of the dishwasher appliance to a cross-flow configuration for said steps of operating and working, the valve coupled to an exit conduit extending from the unfiltered volume of the sump, the valve directing wash fluid in the exit conduit to the sump in the cross-flow configuration.

3. The method of claim 1 , wherein said step of operating is performed before said steps of working and running and said step of working is performed before said step of running.

4. The method of claim 1 , wherein said steps of operating, working and running are performed consecutively during operation of the dishwasher appliance.

5. The method of claim 1 , wherein a duration of the soil collection cycle is less than about fifteen seconds and greater than about two seconds.

6. The method of claim 1 , wherein a duration of the drain cycle is less than about two minutes and greater than thirty seconds.

7. The method of claim 1 , further comprising filling a tub of the dishwasher appliance with wash fluid prior to said step of operating.

8. The method of claim 1 , wherein a velocity of wash fluid in the filtered volume of the sump is less than a velocity of wash fluid in the unfiltered volume of the sump during said step of operating.

9. The method of claim 2 , further comprising actuating the valve of the dishwasher appliance to a drain configuration for said step of running, the valve directing wash fluid in the exit conduit to a drain in the drain configuration.

10. A method for operating a dishwasher appliance having a tub with a sump positioned at a bottom portion of the tub, a filter medium within the sump positioned between a filtered volume of the sump and an unfiltered volume of the sump, a spray assembly also positioned within a wash chamber of the tub, the method comprising:

initiating a wash cycle of the dishwasher appliance;

operating a first pump and a second pump of the dishwasher appliance during the wash cycle of the dishwasher appliance, the first pump urging wash fluid from the unfiltered volume of the sump to the wash chamber of the tub during said step of operating, the second pump urging wash fluid from the filtered volume of the sump to the spray assembly during said step of operating;

starting a soil collection cycle of the dishwasher appliance after the wash cycle of the dishwasher appliance;

working the second pump of the dishwasher appliance during the soil collection cycle of the dishwasher appliance such that the second pump urges wash fluid from the filtered volume of the sump to the spray assembly, the first pump of the dishwasher appliance being deactivated during said step of working;

commencing a drain cycle of the dishwasher appliance after the soil collection cycle of the dishwasher appliance; and

running the first pump of the dishwasher appliance during the drain cycle of the dishwasher appliance such that the first pump urges wash fluid out of the sump, the second pump of the dishwasher appliance being deactivated during said step of running.

11. The method of claim 10 , further comprising adjusting a valve of the dishwasher appliance to a cross-flow configuration for the wash cycle and the soil collection cycle of the dishwasher appliance, the valve coupled to an exit conduit extending from the unfiltered volume of the sump, the valve directing wash fluid in the exit conduit to the sump in the cross-flow configuration.

12. The method of claim 10 , wherein a velocity of wash fluid in the filtered volume of the sump is less than a velocity of wash fluid in the unfiltered volume of the sump during said step of operating.

13. The method of claim 11 , further comprising actuating the valve of the dishwasher appliance to a drain configuration for the drain cycle of the dishwasher appliance, the valve directing wash fluid in the exit conduit to a drain in the drain configuration.