US 12,071,963 B2
Method for controlling a hydraulic system
Marc Rambert, Illkirch-Graffenstaden (FR); and Nicolas Leriche, Strasbourg (FR)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/027,961
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Sep. 14, 2021, PCT No. PCT/DE2021/100757
§ 371(c)(1), (2) Date Mar. 23, 2023,
PCT Pub. No. WO2022/068991, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 10 2020 125 335.4 (DE), filed on Sep. 29, 2020.
Prior Publication US 2023/0366417 A1, Nov. 16, 2023
Int. Cl. F15B 19/00 (2006.01); F15B 20/00 (2006.01); F16D 48/02 (2006.01)
CPC F15B 19/00 (2013.01) [F15B 20/005 (2013.01); F16D 2048/0245 (2013.01); F16D 2048/0266 (2013.01); F16D 2048/0269 (2013.01); F16D 2500/511 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling a hydraulic system for actuating a drive train device of a drive train of a motor vehicle, comprising:
providing a first volumetric flow of a pressure medium via an electrically operated pump;
actuating, via a second volumetric flow generated from the first volumetric flow, a slave cylinder piston of a slave cylinder along an actuation path, in a manner controlled by a switch valve;
during actuation of the slave cylinder, determining the first volumetric flow from rotational parameters and an electric current of an electric motor driving the pump, and mechanical constants of the hydraulic system; and
determining a leakage in the hydraulic system from a comparison of the first and second volumetric flows.