Invention Grant
- Patent Title: Method of controlling a synchronizer actuator fork of a transmission
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Application No.: US14549584Application Date: 2014-11-21
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Publication No.: US09605755B2Publication Date: 2017-03-28
- Inventor: Glenn W. Hoefflin , Minh Q. Truong , Christopher Jay Weingartz
- Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn IP Law
- Main IPC: F16H61/30
- IPC: F16H61/30 ; F16H63/30 ; F16H61/28

Abstract:
A method and system for controlling movement of an actuator fork of a transmission through a pre-synchronization phase of a synchronization event at a pre-synchronization fork velocity includes adjusting the level of fluid pressure applied to an actuator operatively attached to the actuator fork to control the pre-synchronization fork velocity within a predetermined range of a velocity target. The method determines, via a controller, the fork velocity during the pre-synchronization phase of a current synchronization event, compares the determined fork velocity to a velocity target, and adjusts the pressure level of fluid applied to an actuator piston of the actuator to control the velocity of the actuator fork within a predetermined range defined by the velocity target during a subsequent pre-synchronization phase. The velocity target may be defined for a shift type, such as a fast or slow shift, where the shift type is determined by the controller.
Public/Granted literature
- US20160146341A1 METHOD OF CONTROLLING A SYNCHRONIZER ACTUATOR FORK OF A TRANSMISSION Public/Granted day:2016-05-26
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