公开(公告)号：US20170159815A1

公开(公告)日：2017-06-08

申请号：US14959258

申请日：2015-12-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Scott A. Kline ,  Patrick M. Gibson ,  Raj Kommareddy ,  Roberto Diaz

IPC: F16H61/688 ,  F16H61/02

CPC classification number: F16H61/686 ,  B60Y2400/427 ,  F16H61/0213 ,  F16H61/061 ,  F16H61/21 ,  F16H2061/0237 ,  F16H2061/0462 ,  F16H2061/0496 ,  F16H2200/0065 ,  F16H2200/2079 ,  F16H2200/2084

Abstract: A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.

公开(公告)号：US10113639B2

公开(公告)日：2018-10-30

申请号：US14959258

申请日：2015-12-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Scott A. Kline ,  Patrick M. Gibson ,  Raj Kommareddy ,  Roberto Diaz

IPC: F16H61/686 ,  F16H61/02 ,  F16H61/06 ,  F16H61/21 ,  F16H61/04

Abstract: A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.