Clutch calibration for a hybrid electric powertrain
AssigneeFord Global Technologies, LLC
InventorsWei Liang, Daniel S. Colvin, Rajit Johri, Ryan A. McGee, Xiaoyong Wang, Bernard D. Nefcy, Mark S. Yamazaki, Ming L. Kuang, Marvin P. Kraska
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Abstract
Calibration of an engine disconnect clutch for a hybrid electric powertrain. The clutch is prestroked while an engine and machine are stopped. A machine torque is increased until the machine starts rotating. A pressure of the clutch is adjusted as a function of a torque produced by the machine when the machine started rotating.
Claims19
A method of calibrating an engine disconnect clutch in a vehicle comprising:
- after prestroking the clutch, increasing torque of a stopped electric traction machine connected to the clutch while an engine and the vehicle are stopped;
- correcting prestroke clutch movement as a function of a magnitude of torque when the stopped machine initially starts rotating.
A method of calibrating an engine disconnect clutch in a vehicle comprising:
- after prestroking the clutch, increasing torque of a stopped electric traction machine connected to the clutch when a powertrain is not propelling the vehicle;
- correcting the prestroke clutch movement, by changing a clutch pressure, as a function of a magnitude of torque when the stopped machine initially starts rotating, wherein when the magnitude of torque is zero, the prestroke clutch pressure is increased and when the magnitude of torque is greater than zero, the prestroke clutch pressure is decreased.
A method of calibrating an engine disconnect clutch in a vehicle, comprising:
- while the vehicle, an engine and an electric machine are stopped, prestroking the clutch, and then incrementally increasing machine torque until the machine begins to rotate;
- correcting the prestroke clutch pressure based on the machine torque at which the machine began to rotate.
Dependencies are inferred from the claim text.