US 12,351,159 B2
Method for actively changing the frictional value of a hybrid disconnect clutch installed in a power train of a vehicle
Ralf Mannsperger, Renchen (DE); and Timo Enders, Bensheim (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/435,151
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Jan. 27, 2020, PCT No. PCT/DE2020/100048
§ 371(c)(1), (2) Date Aug. 31, 2021,
PCT Pub. No. WO2020/177803, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 10 2019 105 604.7 (DE), filed on Mar. 6, 2019.
Prior Publication US 2022/0135020 A1, May 5, 2022
Int. Cl. B60W 20/40 (2016.01); B60W 10/02 (2006.01); G01C 21/00 (2006.01); F16D 48/06 (2006.01); G06F 16/29 (2019.01)
CPC B60W 20/40 (2013.01) [B60W 10/023 (2013.01); B60W 2510/0275 (2013.01); B60W 2510/0657 (2013.01); B60W 2510/081 (2013.01); B60W 2710/025 (2013.01); F16D 48/06 (2013.01); G06F 16/29 (2019.01)] 11 Claims
OG exemplary drawing
 
9. A method for actively changing the frictional value of a hybrid disconnect clutch, the method comprising:
in response to measured torque capacity being less than a maximum engine torque, initiating a controlled slip by setting a speed of a first motor based on a speed of a second motor, the first motor being driveably connected to vehicle wheels and the second motor being drivably connected to an engine;
during the controlled slip, introducing a predetermined amount of energy into the hybrid disconnect clutch to roughen a surface of a friction lining to increase the frictional value of the friction lining, wherein the controlled slip and the controlled input of energy take place in response to a maximum clutch torque capacity of the hybrid disconnect clutch being less than a maximum torque of the internal combustion engine, and
determining that the maximum torque of the internal combustion engine exceeds the maximum clutch torque capacity of the hybrid disconnect clutch by monitoring a difference between speeds of the first and second electric motors, wherein the controlled slip is set with the controlled energy input when the difference is greater than a slip speed threshold.