Method and apparatus for filling a wash tub of an automatic clot

Details Method and apparatus for filling a wash tub of an automatic clot Method and apparatus for filling a wash tub of an automatic clot

1993-10-22

1995-08-08

Schwadron, Martin P.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

13762411, 68 1205, 68 1222, 236 1212, D06F 3300

Patent

active

054390192

ABSTRACT:
Method and apparatus for filling a wash tub of an automatic clothes washer wherein a controller uses a thermistor embedded in the mixing valve to generate and store historical averages of the cold and warm water temperatures. From these, the hot water temperature is calculated under the assumption that the warm water is 50/50 hot and cold. The controller also uses a timer and a pressure sensitive switch to generate and store a historical average of the flow rate. A flow washer helps justify the assumption that the flow rate is always constant. Based on the hot and cold water temperatures and the anticipated flow rate, the controller calculates the ratio of hot and cold water, and how long each must be turned on to provide the selected water level. Then, each water valve is individually controlled for a single extended on cycle to satisfy the final requirements of temperature and level.

REFERENCES:
patent: 4330081 (1982-05-01), McMillan
patent: 4406401 (1983-09-01), Nettro
patent: 4528709 (1985-07-01), Getz et al.
patent: 4643350 (1987-02-01), DeSchaaf et al.
patent: 5231722 (1993-08-01), Shacklock et al.

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