US 11,889,972 B2
Method for operating a suction device and suction device
Thorsten Langen, Stuttgart (DE); Michael Kaiser, Leutenbach (DE); Gábor Peflof, Winnenden (DE); Juergen Steinbach, Morbach (DE); and Heiko Stoecker, Esslingen (DE)
Assigned to Alfred Kärcher SE & Co. KG, Winnenden (DE)
Filed by Alfred Kärcher SE & Co. KG, Winnenden (DE)
Filed on Jan. 31, 2020, as Appl. No. 16/778,744.
Application 16/778,744 is a continuation of application No. PCT/EP2018/071054, filed on Aug. 2, 2018.
Claims priority of application No. 10 2017 117 684.5 (DE), filed on Aug. 3, 2017.
Prior Publication US 2020/0163517 A1, May 28, 2020
Int. Cl. A47L 9/28 (2006.01); B01D 46/44 (2006.01); A47L 9/14 (2006.01); A47L 5/36 (2006.01); A47L 9/19 (2006.01); B01D 46/00 (2022.01); B01D 46/46 (2006.01); B01D 46/66 (2022.01)
CPC A47L 9/2889 (2013.01) [A47L 5/365 (2013.01); A47L 9/1409 (2013.01); A47L 9/1472 (2013.01); A47L 9/19 (2013.01); A47L 9/2821 (2013.01); A47L 9/2842 (2013.01); B01D 46/0086 (2013.01); B01D 46/444 (2013.01); B01D 46/446 (2013.01); B01D 46/46 (2013.01); B01D 46/66 (2022.01); B01D 2279/55 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for operating a suction device, said suction device comprising a suction unit, a controller implementing an evaluation unit, and a removable filtering device, wherein the suction unit generates a suction flow that flows through the filtering device when said filtering device is arranged on the suction device, said method comprising:
after the suction unit is started up, performing a check whether the filtering device is present, the check comprising:
accessing, by the evaluation unit, check data stored in a table of a storage device of the evaluation unit, or using, by the evaluation unit, an algorithm to compute the check data, the check data containing at least one threshold value or the algorithm defining the at least one threshold value, wherein the at least one threshold value includes a threshold value for switching off the suction unit, and wherein the at least one threshold value is a pressure value;
comparing, by the evaluation unit, an absolute pressure value to the pressure value;
generating and transmitting a switch-off signal from the evaluation unit to a switch of the controller if the absolute pressure value exceeds the pressure value thereby indicating that the filtering device is not present; and
switching off the suction unit,
wherein the pressure value is determined from measurements in which suction hoses of different diameters are attached to the suction device and the pressure value measurements are measured with the filtering device used and without using the filtering device.