Wash liquid level control system for an automatic washer

Details Wash liquid level control system for an automatic washer Wash liquid level control system for an automatic washer

1994-05-20

1996-05-14

Coe, Philip R.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

68 1204, 68 1205, 68 1221, D06F 3302

Patent

active

055155650

ABSTRACT:
An automatic washing machine having an automatic washing liquid level control system including an ultrasonic apparatus for detecting the height of the clothes load in the washing machine and generating a signal representative of the clothes height, a control panel means for allowing user selection of the agitator speed, and means for generating a signal representative of the desired agitator speed. A control unit is provided including a fuzzy control which performs fuzzy inference on the basis of the signal representative of the clothes height and the signal representative of the agitator speed such that the optimum washing liquid level is achieved. In particular, membership functions according to fuzzy theory are defined for the clothes height and the agitator speed. Rules are defined for the height and agitator speed conditions such as for very high clothes height and low agitator speed, or medium high clothes height and high agitator speed, and so on. Each rule is executed using the fuzzy theory to thereby achieve an optimum washing liquid level.

REFERENCES:
patent: 4503575 (1985-03-01), Knoop et al.
patent: 5159823 (1992-11-01), Fukuda et al.
patent: 5230227 (1993-07-01), Kondoh et al.
patent: 5230228 (1993-07-01), Nakano et al.
patent: 5235827 (1993-08-01), Kiuchi et al.
patent: 5241845 (1993-09-01), Ishibashi et al.
patent: 5305485 (1994-04-01), Getz et al.

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