公开(公告)号：US10144284B2

公开(公告)日：2018-12-04

申请号：US15419611

申请日：2017-01-30

申请人： WARN AUTOMOTIVE, LLC

发明人： Kevin M. Christensen ,  Oliver Blake Randall ,  Christopher James Boudreau

IPC分类号： B60K23/08

摘要： Methods and systems are provided for operating a four-wheel drive powertrain of a vehicle. In one example, a method may comprise: in response to a desired shift from a four-wheel drive mode to a two wheel-drive mode: decreasing a transfer case torque output to a secondary driveline to a lower first level and disengaging a disconnect device of the secondary driveline; increasing the transfer case torque output from the lower first level to a higher second level over a duration; and after the duration, reducing the transfer case torque.