公开(公告)号：US10001199B2

公开(公告)日：2018-06-19

申请号：US15557612

申请日：2015-03-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chengwu Duan ,  Ying Huang

IPC: F16H9/12 ,  F16H61/662

CPC classification number: F16H9/125 ,  F16H9/12 ,  F16H61/66272 ,  F16H2061/66277

Abstract: A continuously variable transmission (CVT) (14) includes a drive pulley (18), a driven pulley (20), and an endless rotatable device (22) coupled between the drive and driven pulleys (18, 20). The drive pulley (18) and the driven pulley (20) each include pulley teeth (19T, 21T), and the endless rotatable device (22) includes device teeth (22T). A controller (50) can control the operation of the CVT and can execute the following instructions: (a) receiving a torque request while the device teeth (22T) are mating with the pulley teeth (19T, 21T); (b) determining whether the torque request direction is opposite to the input torque direction; (c) determining whether a current clamping force applied by an actuator (28, 30) to the drive pulley (18) is sufficient to change the direction of the torque transmitted by the drive pulley (18); and (d) commanding the actuator (28; 30) to increase the current clamping force when the current clamping force is not sufficient to change the direction of the torque transmitted by the drive pulley (18).

公开(公告)号：US20180094710A1

公开(公告)日：2018-04-05

申请号：US15557612

申请日：2015-03-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chengwu Duan ,  Ying Huang

IPC: F16H9/12 ,  F16H61/662

CPC classification number: F16H9/125 ,  F16H9/12 ,  F16H61/66272 ,  F16H2061/66277

Abstract: A continuously variable transmission (CVT) (14) includes a drive pulley (18), a driven pulley (20), and an endless rotatable device (22) coupled between the drive and driven pulleys (18, 20). The drive pulley (18) and the driven pulley (20) each include pulley teeth (19T, 21T), and the endless rotatable device (22) includes device teeth (22T). A controller (50) can control the operation of the CVT and can execute the following instructions: (a) receiving a torque request while the device teeth (22T) are mating with the pulley teeth (19T, 21T); (b) determining whether the torque request direction is opposite to the input torque direction; (c) determining whether a current clamping force applied by an actuator (28, 30) to the drive pulley (18) is sufficient to change the direction of the torque transmitted by the drive pulley (18); and (d) commanding the actuator (28; 30) to increase the current clamping force when the current clamping force is not sufficient to change the direction of the torque transmitted by the drive pulley (18).