公开(公告)号：US09651145B1

公开(公告)日：2017-05-16

申请号：US14941004

申请日：2015-11-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Brian H. Fiore ,  Matthew Pruski ,  Bryan Williams ,  Jason Mallory

IPC: F16H61/04

CPC classification number: F16H61/0403 ,  F16H61/061 ,  F16H2061/0462 ,  F16H2306/14 ,  F16H2306/24 ,  F16H2306/48

Abstract: A fixed-gear transmission including a plurality of planetary gear sets and a plurality of clutches is described. A method for controlling the fixed-gear transmission includes commanding a first iteration of a skip-at-sync transmission shift and monitoring clutch slip of an oncoming holding clutch associated with the skip-at-sync transmission shift during execution of the shift, which includes monitoring synchronization of the on-coming holding clutch and a maximum clutch slip overshoot value. A progressive clutch pressure ramp rate for the oncoming holding clutch is adaptively controlled in response to the clutch synchronization of the on-coming hold clutch during execution of a subsequent iteration of the skip-at-sync transmission shift.

公开(公告)号：US20170138468A1

公开(公告)日：2017-05-18

申请号：US14941004

申请日：2015-11-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Brian H. Fiore ,  Matthew Pruski ,  Bryan Williams ,  Jason Mallory

IPC: F16H61/04

CPC classification number: F16H61/0403 ,  F16H61/061 ,  F16H2061/0462 ,  F16H2306/14 ,  F16H2306/24 ,  F16H2306/48

Abstract: A fixed-gear transmission including a plurality of planetary gear sets and a plurality of clutches is described. A method for controlling the fixed-gear transmission includes commanding a first iteration of a skip-at-sync transmission shift and monitoring clutch slip of an oncoming holding clutch associated with the skip-at-sync transmission shift during execution of the shift, which includes monitoring synchronization of the on-coming holding clutch and a maximum clutch slip overshoot value. A progressive clutch pressure ramp rate for the oncoming holding clutch is adaptively controlled in response to the clutch synchronization of the on-coming hold clutch during execution of a subsequent iteration of the skip-at-sync transmission shift.