公开(公告)号：US5315847A

公开(公告)日：1994-05-31

申请号：US859885

申请日：1992-03-30

申请人： Yoshiaki Takeda ,  Katuyosi Miwano ,  Noboru Fujita

发明人： Yoshiaki Takeda ,  Katuyosi Miwano ,  Noboru Fujita

IPC分类号： D06F39/00 ,  G01N27/07 ,  D06F33/02

CPC分类号： D06F39/004 ,  G01N27/07

摘要： A washing machine comprises a washing/dehydrating tank, a water storage tank in which the washing/dehydrating tank is disposed, and a sensor for detecting an electric conductivity of washing water in the washing/dehydrating tank and the water storage tank. The sensor is provided with a pair of electrodes to take into account a variation of an electric resistance of the washing water therebetween, which is representative of the electric conductivity of the washing water, thereby controlling a washing operation of the washing machine. The sensor has a CR oscillation circuit including a resistance which represents the electric conductivity of the water between the electrodes. A variation of the electric conductivity of the washing water is converted into an oscillation frequency variation of the oscillation circuit, and the operation of the washing machine is controlled on the basis of the thus varying oscillation frequency.

摘要翻译： 洗衣机包括洗涤/脱水槽，设置有洗涤/脱水槽的储水箱，以及用于检测洗涤/脱水槽和储水箱中的洗涤水的电导率的传感器。 传感器设置有一对电极，以考虑其间的洗涤水的电阻的变化，其代表洗涤水的电导率，由此控制洗衣机的洗涤操作。 传感器具有CR振荡电路，其包括表示电极之间的水的电导率的电阻。 洗涤水的电导率的变化被转换为振荡电路的振荡频率变化，并且基于如此变化的振荡频率来控制洗衣机的操作。