Bosch-siemens Hausgeraete Gmbh

Paul T Pilgram

Frank Boldt

Peter Blauert

Ulrich Rehfuess

A method for determining an amount of laundry in an at least approximately horizontally supported drum for laundry being driven by a universal drive motor at a washing and drying rpm is performed on the basis of observations of parameters of an operation in a laundry handling machine. A drive moment at the drum drive motor is determined during a drum startup phase, for operating the drum at a controlled handling rpm at which the laundry is not held against a wall of the drum by centrifugal force.

Method for determining the amount of lanudry in a laundry handling

A method for determining a mass of wet laundry in a washing machine drum being driven by an rpm-controlled universal motor is performed with the aid of controller variables. The drum is operated before and/or during a spin cycle within first, second and third phases in a mass determining segment. The drum is operated in the first phase with a delayed rpm rise up to a final rpm above an application rpm at which the laundry is applied to a wall of the drum, and near but below a resonant rpm of a drive system. The drum is operated in the second phase with a constant command rpm equal to the final rpm of a ramp. The drum is operated in the third phase with an rpm running down to a minimum rpm without being driven, and with the rpm still being high enough to prevent a previously developed ring of laundry from separating or more than slightly separating from the drum wall. A length of time is measured from a time when the drive is shut off until a time when the minimum rpm is reached, as a gauge for the mass of the laundry.

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Munchen, Germany

Paul T Pilgram