公开(公告)号：US20190017592A1

公开(公告)日：2019-01-17

申请号：US15648866

申请日：2017-07-13

Applicant: GM Global Technology Operations LLC

Inventor： Todd R. Berger ,  David C. Webert ,  Roberto Diaz ,  David H. Moiseev ,  Joseph V. Pittiglio ,  Dustin A. Nygaard

IPC: F16H61/12 ,  F16H61/30

CPC classification number: F16H61/12 ,  F16H59/08 ,  F16H61/30 ,  F16H63/3483 ,  F16H63/48 ,  F16H2061/1208 ,  F16H2061/1264 ,  F16H2061/1288 ,  F16H2300/18

Abstract: A method for controlling internal electronic range selection for an automatic transmission includes: confirming if a range change command has been ordered from a current transmission operating state; verifying expected performance from at least first and second mode valves and a park servo are present in the current transmission operating state prior to allowing a range change event; during the range change event: generating proactive commands including ordering a reduction in a hydraulic system pressure; and identifying if an unexpected event is detected; and following completion of the range change event confirming expected performance is obtained from at least the first and second mode valves and the park servo to achieve a driver intended state.

公开(公告)号：US20180128328A1

公开(公告)日：2018-05-10

申请号：US15345566

申请日：2016-11-08

Applicant: GM Global Technology Operations LLC

Inventor： Roberto Diaz ,  David C. Webert ,  Patrick M. Gibson

IPC: F16D48/06 ,  F16D41/12

CPC classification number: F16D48/06 ,  F16D41/125 ,  F16D2500/10412 ,  F16D2500/10493 ,  F16D2500/30406 ,  F16D2500/3065 ,  F16D2500/30814 ,  F16D2500/502 ,  F16D2500/7082 ,  F16D2500/7108

Abstract: A system for determining when a selectable one-way clutch has mechanically released includes an update timer identifying if each of a converter model engine torque, a transmission input torque, and a torque converter slip are positive for a predetermined period of time. An SOWC slip value is calculated using an output signal from each of: at least one transmission internal speed sensor producing an output signal representative of a speed of an internal component of a transmission; and at least one transmission output speed sensor producing an output signal representative of a speed of an output of the transmission. An SOWC released signal is issued if either all of the measured converter model engine torque, the measured transmission input torque, and the measured torque converter slip are positive for at least the predetermined period of time, or the calculated SOWC slip value is greater than a predetermined threshold.

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.