Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1997-07-28
1999-04-27
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
F16H 6108
Patent
active
058974563
ABSTRACT:
A downshift control device for an automatic transmission is provided in which the transmission is shifted down by releasing an oil pressure from a first engaging element that has been engaged while applying an oil pressure to a second engaging element that has been released. This downshift control device includes an applied pressure control actuator for controlling a pressure to be applied to the second engaging element, by supplying a pressurized oil to a back pressure chamber of an accumulator provided in an oil path to the second engaging element, and removing the pressurized oil from the back pressure chamber. This control actuator receives a first command to supply the pressurized oil to the back pressure chamber from the time when a downshift command is generated to a predetermined time or the time when a detected gear ratio starts being changed, and then receives a second command to remove the pressurized oil from the back pressure chamber until the detected gear ratio reaches a predetermined gear ratio just before completion of shifting. The control actuator then receives a third command to supply the pressurized oil to the back pressure chamber after the detected gear ratio reaches the predetermined gear ratio.
REFERENCES:
patent: 5085103 (1992-02-01), Ando et al.
patent: 5800309 (1998-09-01), Takiguchi et al.
Jatco Corporation
Wright Dirk
LandOfFree
Downshift control device for automatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Downshift control device for automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downshift control device for automatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-681845