Water level sensing method and apparatus in washing machine

Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Manipulation of liquid

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8159, 68 1204, 68 1205, D06F 3302

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active

059876794

ABSTRACT:
A water level sensing method and apparatus sense a level of water supplied in washing tub of the washing machine. In the apparatus, a key input section generates a water level sensing mode signal so as to select a water level sensing mode. A sensor firstly senses an amount of laundry in a dry state supplied in a washing tub of the washing machine responsive to the water level sensing mode signal from the key input section and secondly senses an amount of the laundry in a wet state. A water supply section supplies the washing tub with water to a predetermined water level to thereby change the washing articles in a dry state into a wet state. A microprocessor determines first and second water levels according to the first and second sensing results of the sensor, respectively, compares the second water level with the first water level and determnines a correct water level based on the comparison result. The method and apparatus can perform a washing operation at suitable water level by sensing an amount of laundry by means of dry and wet sensing manners which sense an amount of loads in dry and wet states, respectively.

REFERENCES:
patent: 4303406 (1981-12-01), Ross
patent: 5072473 (1991-12-01), Thuruta et al.
patent: 5419163 (1995-05-01), Kim et al.
patent: 5671493 (1997-09-01), Moon
patent: 5768728 (1998-06-01), Harwood et al.

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