公开(公告)号：US10046750B1

公开(公告)日：2018-08-14

申请号：US15469796

申请日：2017-03-27

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： James L Abington ,  Christopher J Weingartz

IPC: B60W10/02

Abstract: A continuously variable transmission, a control system, and a method is provided for synchronizing a clutch application state change and a continuous upshift in a motor vehicle propulsion system having a continuously variable transmission (CVT). The control system and method are configured to determine whether a continuous upshift of the CVT is impending. The continuous upshift is defined as a pulley ratio change exceeding a predetermined threshold for a predetermined pulley ratio change period. If a continuous upshift is impending, the control system and method are configured to alter a clutch engagement state after a predetermined delay period to synchronize the change in clutch engagement state with an engine speed change.

公开(公告)号：US20180202549A1

公开(公告)日：2018-07-19

申请号：US15409628

申请日：2017-01-19

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： James M Gessner ,  Christopher J Weingartz ,  John E Marano ,  Cole Reinhold

IPC: F16H61/662 ,  B60R16/023

CPC classification number: F16H61/662 ,  F16H61/66 ,  F16H2059/704 ,  F16H2061/0096

Abstract: A method and system for controlling a ratio of a continuously variable transmission coupling a prime mover to a driven member in a vehicle. The method includes determining a current ratio of the continuously variable transmission, determining a projected ratio from a first ratio path of a predetermined ratio map, calculating a gradient between the current ratio and the projected ratio, determining whether the calculated gradient satisfies a gradient constraint, setting a control ratio to the projected ratio if the calculated gradient satisfies the gradient constraint, setting a control ratio to a modified ratio if the calculated gradient does not satisfy the gradient constraint, the modified ratio being based upon a ratio that satisfies the gradient constraint, and controlling the ratio of the continuously variable transmission to the control ratio.

公开(公告)号：US10518778B2

公开(公告)日：2019-12-31

申请号：US15791681

申请日：2017-10-24

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Ronald F Lochocki, Jr. ,  Christopher J Weingartz ,  Bret J Keller

IPC: B60W30/188 ,  B60W10/06 ,  B60W10/107

Abstract: A vehicle propulsion system includes a prime mover having a prime mover output shaft, a continuously variable transmission having a variator input shaft coupled to the prime mover output shaft and having a variator output shaft, a driver torque request module in communication with a driver input and for outputting a driver torque request, an engine backbone in communication with the prime mover, and a transmission backbone in communication with the continuously variable transmission and the engine backbone in the vehicle propulsion system. The transmission backbone includes a positive torque request module that generates a positive torque request, and a positive torque request monitor that limits a torque request from the transmission backbone to the engine backbone to a maximum of a predetermined threshold.

公开(公告)号：US10024427B1

公开(公告)日：2018-07-17

申请号：US15409628

申请日：2017-01-19

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： James M Gessner ,  Christopher J Weingartz ,  John E Marano ,  Cole Reinhold

IPC: F16H61/66 ,  F16H61/662 ,  B60R16/023 ,  F16H59/70 ,  F16H61/00

Abstract: A method and system for controlling a ratio of a continuously variable transmission coupling a prime mover to a driven member in a vehicle. The method includes determining a current ratio of the continuously variable transmission, determining a projected ratio from a first ratio path of a predetermined ratio map, calculating a gradient between the current ratio and the projected ratio, determining whether the calculated gradient satisfies a gradient constraint, setting a control ratio to the projected ratio if the calculated gradient satisfies the gradient constraint, setting a control ratio to a modified ratio if the calculated gradient does not satisfy the gradient constraint, the modified ratio being based upon a ratio that satisfies the gradient constraint, and controlling the ratio of the continuously variable transmission to the control ratio.