Flow-based on-coming clutch fill control for an automatic transmission,申请号US20000531848-传众专利搜索

Flow-based on-coming clutch fill control for an automatic transmission

申请公布号：US6285942(B1)

申请号：US20000531848

申请日期：2000.03.20

申请公布日期：2001.09.04

申请人：

GENERAL MOTORS CORPORATION

发明人：STEINMETZ TODD M;RUNDE JEFFREY KURT;HUBBARD GREGORY A;MCCAULEY PHILLIP F;LONG CHARLES FRANCIS;DADEL MARTIN ROBERT

分类号：F16H61/06;(IPC1-7):G06F17/00;G06F7/00;G06F19/00

主分类号：F16H61/06

摘要：An improved shift control for a hydraulic automatic transmission in which the apply chamber of an on-coming clutch is filled in the preparation phase of the shift using a hydraulic flow rate model to estimate the volume of hydraulic fluid supplied to the apply chamber. In an initial portion of the fill interval, fluid is supplied to the apply chamber at a first elevated pressure, while continuously updating the fluid volume estimate. When the remaining un-filled volume of the apply chamber reaches a reference volume, the supply pressure is reduced to a second pressure at which the next phase of the shift is to be carried out. When the chamber volume is filled, the torque capacity of the clutch rises to a level corresponding to the second pressure, and the next phase of the shift automatically ensues.