• Patent Title: Method and controller for operating a drivetrain of a vehicle
  • Application No.: US17291777
    Application Date: 2019-11-07
  • Publication No.: US11378142B2
    Publication Date: 2022-07-05
  • Inventor: Kai Leingruber
  • Applicant: ZF Friedrichshafen AG
  • Applicant Address: DE Friedrichshafen
  • Assignee: ZF Friedrichshafen AG
  • Current Assignee: ZF Friedrichshafen AG
  • Current Assignee Address: DE Friedrichshafen
  • Agency: Finch & Maloney PLLC
  • Agent Michael J. Bujold; Jay S. Franklin
  • Priority: DE102018218930.7 20181107
  • International Application: PCT/EP2019/080526 WO 20191107
  • International Announcement: WO2020/094784 WO 20200514
  • Main IPC: F16D48/06
  • IPC: F16D48/06
Method and controller for operating a drivetrain of a vehicle
Abstract:
A method of operating a vehicle drivetrain for rocking the vehicle free. The drivetrain has a transmission with an input and an output that can be coupled by a clutch. The input and output are connected to a drive aggregate and a drive output, respectively. The clutch is actuated based on driver actuation of an accelerator and a rotational speed of the drive output such that following accelerator actuation, when its actuation decreases, the clutch disengages with a first opening gradient. Then, based on a calculated point in time at which drive aggregate torque upon the clutch corresponds to torque on the clutch from the drive output, the clutch disengages with a second, smaller opening gradient. And depending on a rotational speed of the drive output relative to a limit value, the clutch either initiates or terminates engagement with a first closing gradient.
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