公开(公告)号：US20230126525A1

公开(公告)日：2023-04-27

申请号：US17508584

申请日：2021-10-22

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Timothy Z. JIN ,  Steven P. Moorman ,  Kenneth William Lampert ,  Patrick Jebson Carroll ,  Leah Rose Bridson

IPC: F16H61/02 ,  F16H61/12 ,  G05D16/20

Abstract: A transmission hydraulic control system includes a manual valve, a default valve, and a clutch prime valve. The manual valve allows fluid flow from a pressurized line to a drive line when the manual valve is open (when a transmission is in drive or reverse). The manual valve prevents fluid flow from the pressurized line to the drive line when the manual valve is closed (when the transmission is in neutral or park). The clutch prime valve allows fluid to flow from the pressurized line to the drive line, and thereby bypass the manual valve, when the manual valve is closed and the clutch prime valve is open. The default valve allows fluid bypassing the manual valve to flow to prime a clutch of the transmission when the default valve is open. The clutch prime valve prevents fluid from bypassing the manual valve when the clutch prime valve is closed.