US 12,331,830 B2
Method for actuating a hydraulic device
Yunfan Wei, Bühl (DE); Oliver Rink, Karlsruhe (DE); and Carsten Mayer, Lohr a. Main (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/907,984
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Feb. 23, 2021, PCT No. PCT/DE2021/100177
§ 371(c)(1), (2) Date Aug. 30, 2022,
PCT Pub. No. WO2021/175366, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 10 2020 105 820.9 (DE), filed on Mar. 4, 2020.
Prior Publication US 2023/0151807 A1, May 18, 2023
Int. Cl. F16H 61/00 (2006.01); F04B 49/06 (2006.01); F04B 49/08 (2006.01); F04B 49/20 (2006.01); F15B 11/17 (2006.01); F16D 25/12 (2006.01); F16D 48/02 (2006.01); F16D 48/06 (2006.01); F16H 57/04 (2010.01); F16H 61/688 (2006.01)
CPC F16H 61/0031 (2013.01) [F04B 49/065 (2013.01); F15B 11/17 (2013.01); F16D 25/123 (2013.01); F16D 48/02 (2013.01); F16D 48/0206 (2013.01); F16H 57/0435 (2013.01); F16H 57/0446 (2013.01); F16H 57/0473 (2013.01); F16H 61/0025 (2013.01); F16H 61/688 (2013.01); F04B 49/08 (2013.01); F04B 49/20 (2013.01); F04B 2205/05 (2013.01); F15B 2211/20592 (2013.01); F16D 2048/0245 (2013.01); F16D 2048/0263 (2013.01); F16D 2048/0266 (2013.01); F16D 48/062 (2013.01); F16D 2300/14 (2013.01); F16H 2061/0037 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for actuating a hydraulic device, which provides a hydraulic supply to a torque-transmitting device, comprising:
operating an electrically operated pump device in a first operating state, wherein the first operating state has a primary pump rotational speed that provides a first fluid pressure to the torque-transmitting device via a fluid tract;
based on a second fluid pressure and a second fluid target pressure, initiating a switchover process to operate the electrically operated pump device in a second operating state, wherein the second operating state has a secondary pump rotational speed that provides the second fluid pressure to the torque-transmitting device via the fluid tract; and
during the operation of the hydraulic device, determining the secondary pump rotational speed for the switchover process based on a first power value, the first power value includes electrical pump power of the pump device in a preceding switchover process.