Method for actively changing the frictional value of a hybrid disconnect clutch installed in a power train of a vehicle
AssigneeSchaeffler Technologies AG & Co. KG
InventorsRalf Mannsperger, Timo Enders
Life of this patent
Estimating the term…
Abstract
A method actively changes the frictional value of a hybrid disconnect clutch installed in a powertrain of a vehicle in which a first electric motor (18) is connected to a clutch input (21) and an internal combustion engine (17), and a second electric motor (19) is connected to a clutch output (22) and a vehicle output (23). The frictional value of the hybrid disconnect clutch is actively changed, in order to roughen a surface of the friction linings on the hybrid disconnect clutch (20). A slip situation is established at the hybrid disconnect clutch (20), and during this slip situation energy is introduced into the hybrid disconnect clutch (20) in a controlled manner.
Claims11
A method for actively changing a frictional value of a hybrid disconnect clutch installed in a powertrain of a vehicle, the method comprising:
- providing a first electric motor connected to a clutch input and an internal combustion engine,
- providing a second electric motor connected to a clutch output and a vehicle output, and
- roughening a surface of the friction linings on the hybrid disconnect clutch by establishing a controlled slip at the hybrid disconnect clutch, wherein during the controlled slip, more energy is introduced into the hybrid disconnect clutch to increase the frictional value of the friction linings, and
- wherein the controlled slip on the hybrid disconnect clutch for controlled energy input into the hybrid disconnect clutch ends in response to a predetermined energy input threshold value being reached.
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.
Dependencies are inferred from the claim text.