发明名称 |
Ultrasonic water level detection system for use in a washing machine |
摘要 |
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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申请公布号 |
US5822819(A) |
申请公布日期 |
1998.10.20 |
申请号 |
US19970864534 |
申请日期 |
1997.05.28 |
申请人 |
RAYTHEON APPLIANCES INC. |
发明人 |
FERRAGUT, NELSON J.;ESTENSON, MICHAEL A.;PETTY, J. SCOTT |
分类号 |
D06F39/08;(IPC1-7):D06F33/02 |
主分类号 |
D06F39/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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