公开(公告)号：US20190040946A1

公开(公告)日：2019-02-07

申请号：US15667169

申请日：2017-08-02

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Henry R. Wright ,  Brandon M. Fell ,  Martin Gentile ,  Rainer Kloesel ,  Falko Hendrischke ,  Julian Heinz ,  Marcel Wachtel

IPC: F16H59/44

Abstract: A method of adjusting deceleration dependent shift points to maintain a target minimum turbine speed includes calculating a vehicle speed offset based on vehicle acceleration rate a predicted downshift delay for the target minimum turbine speed and converting the target minimum turbine speed to a target vehicle speed based on the deceleration condition. Thereafter, the method continues with determining a target gear based on the vehicle speed offset and the target vehicle speed, and downshifting to the target gear having vehicle speed less than or equal to a vehicle speed corresponding to the current turbine speed. The method ends with maintaining the target gear until a shift delay period is greater than a predetermined delay threshold.