Invention Grant
- Patent Title: Method for preselecting a gear in a multi-clutch transmission of a vehicle upon exiting free-wheeling state
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Application No.: US15023237Application Date: 2013-10-11
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Publication No.: US10196060B2Publication Date: 2019-02-05
- Inventor: Fredrik Karpenman
- Applicant: VOLVO TRUCK CORPORATION
- Applicant Address: SE Göteborg
- Assignee: Volvo Truck Corporation
- Current Assignee: Volvo Truck Corporation
- Current Assignee Address: SE Göteborg
- Agency: WRB-IP LLP
- International Application: PCT/EP2013/003057 WO 20131011
- International Announcement: WO2015/051812 WO 20150416
- Main IPC: B60W30/18
- IPC: B60W30/18 ; B60W10/113 ; F16H61/04 ; F16H61/688 ; B60W10/02 ; B60W10/06

Abstract:
A method is provided for preselecting a gear in a multi-clutch transmission of a vehicle upon exiting free-wheeling state, wherein the multi-clutch transmission being operated in a free-wheeling state having a gear of a first set of gears preselected and a first friction clutch being disengaged; the method including the steps of: A) upon determining that at least one predetermined condition for exiting free-wheeling state is met; increasing the rotational speed of the prime mover towards a rotational synchronization speed of the preselected gear; the second friction clutch being in a closed state such that the rotational speed of the input shaft of the second friction clutch increases with the increasing rotational speed of the prime mover; B) disengaging the second friction clutch; C) engaging, at a suitable time point, at least one tooth clutch of the second subset of the tooth clutches corresponding to a gear of the second set of gears such that the gear of the second set of gears becomes preselected.
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