公开(公告)号：US10106164B2

公开(公告)日：2018-10-23

申请号：US15251657

申请日：2016-08-30

Applicant: GM Global Technology Operations LLC

Inventor： Peter J. Giles ,  Shaun D. Hoffman ,  Anthony Capobianco

IPC: B60W10/06 ,  B60W10/11 ,  B60W10/14 ,  B60W30/188 ,  B60K17/346 ,  B60K23/08 ,  B60W50/14 ,  F16H3/46 ,  F16H61/02 ,  F16H61/04

Abstract: A method for shifting between a low speed range and a high speed range for a two-speed transfer case in a four-wheel drive vehicle includes determining a target transmission gear ratio and a desired transfer case range based on the current vehicle speed and the initial transfer case range. The transmission is shifted to the target transmission gear ratio when it is determined that the vehicle speed is in an appropriate range. The transfer case input torque is reduced to a minimum value, and the transfer case is shifted to neutral. The method further includes adjusting the engine speed and transmission gear setting to control the transmission output shaft speed to a desired range. The transfer case is shifted from neutral to the desired transfer case range when the transmission output shaft speed is within the desired range of transmission output shaft speed.

公开(公告)号：US20180057005A1

公开(公告)日：2018-03-01

申请号：US15251657

申请日：2016-08-30

Applicant: GM Global Technology Operations LLC

Inventor： Peter J. Giles ,  Shaun D. Hoffman ,  Anthony Capobianco

IPC: B60W30/188 ,  F16H3/46 ,  F16H61/02 ,  B60W10/06 ,  B60W10/11 ,  B60W10/14 ,  B60W50/14 ,  B60K17/346 ,  B60K23/08

CPC classification number: B60W30/188 ,  B60K17/3467 ,  B60K23/08 ,  B60W10/06 ,  B60W10/11 ,  B60W10/14 ,  B60W50/14 ,  B60W2510/1005 ,  B60W2520/10 ,  B60W2710/0644 ,  B60W2710/0666 ,  B60W2710/1005 ,  B60W2710/1038 ,  F16H3/46 ,  F16H61/0213 ,  F16H61/0437 ,  F16H2200/0017 ,  F16H2200/0034 ,  F16H2200/2005

Abstract: A method for shifting between a low speed range and a high speed range for a two-speed transfer case in a four-wheel drive vehicle includes determining a target transmission gear ratio and a desired transfer case range based on the current vehicle speed and the initial transfer case range. The transmission is shifted to the target transmission gear ratio when it is determined that the vehicle speed is in an appropriate range. The transfer case input torque is reduced to a minimum value, and the transfer case is shifted to neutral. The method further includes adjusting the engine speed and transmission gear setting to control the transmission output shaft speed to a desired range. The transfer case is shifted from neutral to the desired transfer case range when the transmission output shaft speed is within the desired range of transmission output shaft speed.