Ultrasonic water level detection system for use in a washing mac

Details Ultrasonic water level detection system for use in a washing mac Ultrasonic water level detection system for use in a washing mac

1997-05-28

1998-10-20

Coe, Philip R.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

68 1205, 68 1221, D06F 3302

Patent

active

058228195

ABSTRACT:
A water level detection system and method for automatically controlling in real time the water height in a washing machine to assure the optimum operating level. An ultrasonic transceiver generates a plurality of ultrasonic pulses and detects the corresponding echoes. A microprocessor stores a plurality of ranging signals representing the time period between the ultrasonic pulse and the detection of the corresponding echo. A set of the ranging signals forms a mathematical or graphic signature which changes as the water level rises up through the clothes in the washing machine. The microprocessor detects when a predetermined characteristics occurs in this signature and sends a signal to the standard washing machine controls to stop the flow of water.

REFERENCES:
patent: 5305485 (1994-04-01), Getz et al.
patent: 5515565 (1996-05-01), Maddix et al.

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