Washing machine control method

Details Washing machine control method Washing machine control method

2008-03-11

2008-03-11

Perrin, Joseph L. (Department: 1792)

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

Reexamination Certificate

active

07340793

ABSTRACT:
In a method of controlling to a water supplying step and a water draining step in a washing machine having no anti-siphoning device, an error state is determined when water supplying and water draining are simultaneously performed. The error state is determined for cases where there is no change in water level after supplying water for a predetermined time. In such cases, water is then re-supplied after a complete draining. The method includes steps of (a) sensing an initial level of water remaining in the washing machine; (b) storing in a memory a value indicative of the sensed initial water level if the sensed initial water level exceeds a predetermined substantive amount and executing a first water supplying step; (c) discharging the remaining water from the washing machine, executing a second water supplying step, and sensing a current water level if the sensed initial water level is less than the predetermined substantive amount; (d) determining a water level variation based on the sensed current water level and the stored value; (e) repeating the step (c) if the determined water level variation continues to be less than a predetermined value for a first predetermined time period; (f) displaying an internal error if the determined water level variation continues to be less than the predetermined value after a predetermined number of repetitions of the step (e); and (g) executing a user-selected washing step if the determined water level variation exceeds the predetermined value.

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