US 11,873,870 B2
Method for controlling a friction clutch, and torque transmission device comprising same
Carsten Mayer, Lohr a. Main (DE); Marco Grethei, Bühlertal (DE); and Yunfan Wei, Bühl (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/762,120
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Aug. 26, 2020, PCT No. PCT/DE2020/100754
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/058053, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10 2019 126 191.0 (DE), filed on Sep. 27, 2019.
Prior Publication US 2022/0373042 A1, Nov. 24, 2022
Int. Cl. F16D 48/06 (2006.01); F16D 48/02 (2006.01)
CPC F16D 48/066 (2013.01) [F16D 48/0206 (2013.01); F16D 2048/0221 (2013.01); F16D 2048/0266 (2013.01); F16D 2048/0269 (2013.01); F16D 2500/1026 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling a friction clutch actuated by an actuation system using an actuation pressure ambiguously applied along an actuation path, comprising:
providing the friction clutch and the actuation system;
detecting a time curve of an actuation processes of the friction clutch;
comparing the time curve with the actuation pressure to ascertain an unambiguous friction clutch actuation path;
using the time curve to determine whether the friction clutch is in an opening state or a closing state and whether the actuation pressure is applied to an opened friction clutch actuation path or a closed friction clutch actuation path;
starting from a set actuation pressure, carrying out a directional control of the friction clutch by specifying the actuation pressure;
providing an electrically actuated directional control valve arranged between a pressure supply device and the friction clutch, the electrically actuated directional control valve comprising:
a first position connecting the friction clutch to the pressure supply device for opening the friction clutch;
a second position connecting the friction clutch to an unpressurized reservoir for closing the friction clutch; and
a third position closed relative to the friction clutch, wherein the unambiguous actuation friction clutch path is a function of a position of the electrically actuated directional control valve; and
switching the electrically actuated directional control valve to the first position when the electrically actuated directional control valve is in the third position and the actuation pressure is increasing due to leakage.