公开(公告)号：US10408343B2

公开(公告)日：2019-09-10

申请号：US15639510

申请日：2017-06-30

Applicant: GM Global Technology Operations LLC

Inventor： Joseph W. Tatangelo ,  Paul G. Otanez

IPC: F16H61/662 ,  F16H9/18 ,  F16H61/66

Abstract: A continuously variable transmission pump limited stop controls system includes a continuously variable transmission (CVT) including primary and secondary variator pulleys. The primary and the secondary variator pulley each have a mating half with a conical face, defining a variable-width gap between each pulley and its mating half. A flexible member is positioned within the gap and is movable on the conical faces defining a CVT ratio. A secondary pulley valve controls flow of a fluid to the secondary variator pulley. A secondary pulley pressure boost system identifies if a rapid stop event is occurring and issues a command to fully open the secondary pulley valve during the rapid stop event. As the CVT ratio reaches a predetermined threshold of a desired relaunch ratio during the rapid stop event, an engine speed request is issued to an engine connected to the CVT to increase engine speed.

公开(公告)号：US20190003588A1

公开(公告)日：2019-01-03

申请号：US15639510

申请日：2017-06-30

Applicant: GM Global Technology Operations LLC

Inventor： Joseph W. Tatangelo ,  Paul G. Otanez

IPC: F16H61/662 ,  F16H9/18

CPC classification number: F16H61/66231 ,  F16H9/18 ,  F16H61/66272 ,  F16H2061/6605 ,  F16H2312/18

Abstract: A continuously variable transmission pump limited stop controls system includes a continuously variable transmission (CVT) including primary and secondary variator pulleys. The primary and the secondary variator pulley each have a mating half with a conical face, defining a variable-width gap between each pulley and its mating half. A flexible member is positioned within the gap and is movable on the conical faces defining a CVT ratio. A secondary pulley valve controls flow of a fluid to the secondary variator pulley. A secondary pulley pressure boost system identifies if a rapid stop event is occurring and issues a command to fully open the secondary pulley valve during the rapid stop event. As the CVT ratio reaches a predetermined threshold of a desired relaunch ratio during the rapid stop event, an engine speed request is issued to an engine connected to the CVT to increase engine speed.

公开(公告)号：US10352442B2

公开(公告)日：2019-07-16

申请号：US14944462

申请日：2015-11-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Joseph W. Tatangelo ,  Zhen J. Zhang ,  Paul G. Otanez

IPC: F16H61/66 ,  F16H9/18 ,  F16H61/662

Abstract: A continuously variable transmission (CVT) including a hydraulically-controllable variator is described. A method for controlling the CVT includes detecting a transient event causing a commanded change in a speed ratio of the variator and disabling feedback control of hydraulic pressure to the variator during the transient event. A target pressure that achieves the commanded change in the speed ratio of the variator is determined, and a pressure trajectory is determined based upon the target pressure. A feed-forward control of the hydraulic pressure to the variator is executed in response to the pressure trajectory during the transient event.

公开(公告)号：US20170138472A1

公开(公告)日：2017-05-18

申请号：US14944462

申请日：2015-11-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Joseph W. Tatangelo ,  Zhen J. Zhang ,  Paul G. Otanez

IPC: F16H61/662 ,  F16H9/18

CPC classification number: F16H61/662 ,  F16H9/18 ,  F16H61/66259 ,  F16H2061/0078

Abstract: A continuously variable transmission (CVT) including a hydraulically-controllable variator is described. A method for controlling the CVT includes detecting a transient event causing a commanded change in a speed ratio of the variator and disabling feedback control of hydraulic pressure to the variator during the transient event. A target pressure that achieves the commanded change in the speed ratio of the variator is determined, and a pressure trajectory is determined based upon the target pressure. A feed-forward control of the hydraulic pressure to the variator is executed in response to the pressure trajectory during the transient event.