US 12,305,315 B2
Method for operating a washing machine, and washing machine
Rainer Bicker, Verl (DE); and Magnus Kortenjann, Telgte (DE)
Assigned to MIELE & CIE. KG, Gütersloh (DE)
Appl. No. 17/915,428
Filed by Miele & Cie. KG, Gütersloh (DE)
PCT Filed Mar. 22, 2021, PCT No. PCT/EP2021/057249
§ 371(c)(1), (2) Date Sep. 28, 2022,
PCT Pub. No. WO2021/197892, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10202010894.6 (DE), filed on Mar. 30, 2020.
Prior Publication US 2023/0119831 A1, Apr. 20, 2023
Int. Cl. D06F 34/16 (2020.01); D06F 33/32 (2020.01); D06F 34/18 (2020.01); D06F 34/20 (2020.01); D06F 37/02 (2006.01); D06F 37/30 (2020.01); D06F 103/02 (2020.01); D06F 103/24 (2020.01); D06F 103/26 (2020.01); D06F 103/38 (2020.01); D06F 103/46 (2020.01); D06F 105/48 (2020.01)
CPC D06F 34/16 (2020.02) [D06F 33/32 (2020.02); D06F 34/18 (2020.02); D06F 34/20 (2020.02); D06F 37/02 (2013.01); D06F 37/304 (2013.01); D06F 2103/02 (2020.02); D06F 2103/24 (2020.02); D06F 2103/26 (2020.02); D06F 2103/38 (2020.02); D06F 2103/46 (2020.02); D06F 2105/48 (2020.02)] 9 Claims
OG exemplary drawing
 
1. A method for operating a washing machine having a suds container for holding washing liquid, a non-ribbed drum provided with a plurality of stamped portions rotatably mounted in the suds container for holding laundry, a motor for driving the drum, and a control device, said method, during rotation of the drum in a subcritical rotational speed range, comprising the following steps:
sampling a variable related to the drum or the motor over a predetermined period of time to determine time signals of the variable, the variable being a torque of the motor or correlating with the torque of the motor, or an actual rotational speed of the drum or correlating with the actual rotational speed;
executing a frequency analysis of the time signal of the variable to determine frequency components of the variable in a predetermined frequency range;
summing the frequency components at predetermined frequencies of the predetermined frequency range; and
detecting, depending on the sum of the summed up frequency components in relation to a quantity and arrangement of the plurality of stamped portions, whether a loading situation where laundry is sliding in the drum is present.