Title:
A METHOD FOR OPERATING A VEHICLE DRIVETRAIN
Document Type and Number:
WIPO Patent Application WO/2022/007606
Kind Code:
A1
Abstract:
A method for operating a vehicle drivetrain (4) including a dog clutch (31-33) and having at least two distinct operating modes: an initial phase shift identifying mode and a normal operating mode. The method comprises a first step of providing the dog clutch (31-33) for selective torque transmission, wherein the dog clutch (31-33) has a first clutch portion with a first set of teeth (31a-33a) and a second clutch portion with a second set of teeth (31b-33b), and wherein the first clutch portion is axially moveable for enabling shifting of the dog clutch (31-33) between an engaged state, in which the first and the second clutch portions are operable to transmit torque between the first and the second clutch portion via the first and the second set of teeth, and a disengaged state, in which the first and the second clutch portions are rotatable with respect to each; a first electrical propulsion motor (2a, 2b) drivingly connected with one of the first and the second clutch portions; and a clutch actuator (13, 34) operably connected with the first clutch portion for shifting the dog clutch (31-33) between the engaged and the disengaged states by controlling an axial position of the first clutch portion. The method further comprises a second step of setting the drive train (4) in the initial phase shift identifying mode, which includes controlling the clutch actuator (13, 34) and the first electrical propulsion motor (2a, 2b) for performing a plurality of clutch engagement movements for a set of different relative angles between the first and the second clutch portions, while registering for each individual clutch engagement movement a clutch actuator feedback signal associated with the clutch actuator (13, 34) and indicative of either successful mutual intermeshing engagement of the first and the second sets of teeth, or teeth collision of the first and the second sets of teeth; and identifying, based on the registered clutch actuator feedback signal, the initial phase shift between the first and the second clutch portions that corresponds to successful mutual intermeshing engagement of the first and the second sets of teeth. Finally, the method includes a third step of setting the drivetrain (4) in the normal operating mode, which includes obtaining angular position data associated with the first and the second clutch portions; controlling engagement of the dog clutch (31-33) while taking the obtained angular position data of the first and the second clutch portions and said identified initial phase shift into account for enabling interference-free engagement of the dog clutch. A vehicle drivetrain and a vehicle comprising the vehicle drivetrain are also disclosed.
Inventors:
PIRACHA MUDDASSAR (SE)
KONG QIANYIN (SE)
KONG QIANYIN (SE)
Application Number:
PCT/CN2021/100407
Publication Date:
January 13, 2022
Filing Date:
June 16, 2021
Export Citation:
Assignee:
NINGBO GEELY AUTOMOBILE RES & DEVELOPMENT CO LTD (CN)
GEELY HOLDING GROUP CO LTD (CN)
GEELY HOLDING GROUP CO LTD (CN)
International Classes:
B60K17/02; B60K17/28
Domestic Patent References:
| WO2008019848A2 | 2008-02-21 |
Foreign References:
| CN108016285A | 2018-05-11 | |||
| CN102126425A | 2011-07-20 | |||
| CN103373220A | 2013-10-30 | |||
| CN109334428A | 2019-02-15 | |||
| US20140221149A1 | 2014-08-07 | |||
| US7101302B2 | 2006-09-05 |
Attorney, Agent or Firm:
KING & WOOD MALLESONS (CN)
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