Bsh Bosch Und Siemens Hausgeraete Gmbh

Christian Engel

Andreas Stolze

Gundula Czyzewski

Wolfgang Proppe

Carsten Stelzer

A turbidity sensor is built in at a location being reachable by washing fluid in an automatic washing machine having a microprocessor for process control, a light transmitter and a light receiver for transmitting light through the washing fluid in a measurement path. A method for temperature compensation of measured values of the turbidity sensor includes calculating a temperature coefficient of the turbidity sensor for each operating point and storing the temperature coefficient in memory as a correction value in software for evaluating measurement results of the turbidity sensor. A respective measurement result is corrected by using the temperature coefficient as a function of a temperature being present and measured at the turbidity sensor.

Method for temperature compensation of measured values of a turbidity

The fluid line between a drain opening at the bottom of the tub and an opening located at a higher level in the tub includes a line segment, which serves solely to keep the washwater in the tub in circulation between the upper opening and the drain opening. The line also has a solid pipe segment with a transparent region, at the wall of which a sensor is mounted that responds to the turbidity of the washwater. The sensor has an optical transmitter and an optical receiver. The sensor elements are built into a forked housing so as to securely mount and protect the sensor from the severe shaking during spin cycles. The forked housing embraces the pipe segment and the housing is adapted to the outer shape of the pipe segment at the faces which are in contact with the transparent region.

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Berlin, Germany

Christian Engel