Ultrasonic water level detection system for use in a washing machine
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
May 28, 1997
filing date -
May 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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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.
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