Method of detecting the clogging of a filter installed in a wash

Details Method of detecting the clogging of a filter installed in a wash Method of detecting the clogging of a filter installed in a wash

1996-09-25

1998-02-03

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340618, 68 1205, 68207, G08B 2100

Patent

active

057149399

ABSTRACT:
Disclosed is a method of detecting the clogging of a filter installed in a washing machine by which a user can recognize the clogging of the filter. The method comprises the steps of detecting a first frequency using a liquid level sensor when a liquid level in an outer tub has reached a first liquid level, of recording a value of the first frequency in a memory section of the microcomputer, of demoting a second frequency using the liquid level sensor when a liquid level in the outer tub has reached a second liquid level which is formed in the outer tub while the washing cycle is being executed, of recording a value of the second frequency in the memory section of the microcomputer, of calculating a value of a third frequency by subtracting the value of the first frequency from the value of the second frequency, and of sending an operating signal to a signal lamp when the value of the third frequency is lower than a predetermined frequency range which is preset in the microcomputer. By the method, the user can recognize the clogging of the filter without disassembling the filter from the washing machine and without checking the interior of the filter, so the user does not need to frequently check and clean the filter by disassembling the filter from the washing machine.

REFERENCES:
patent: 4195500 (1980-04-01), Tobita et al.
patent: 4201240 (1980-05-01), Case
patent: 5159823 (1992-11-01), Fukuda et al.
patent: 5297307 (1994-03-01), Baek
patent: 5477731 (1995-12-01), Mouton
patent: 5565851 (1996-10-01), Richards et al.

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