Interrelated power delivery controls – including engine control – Clutch control – Condition responsive control
Reexamination Certificate
2007-10-09
2007-10-09
Lewis, Tisha (Department: 3681)
Interrelated power delivery controls, including engine control
Clutch control
Condition responsive control
C477S180000
Reexamination Certificate
active
11175539
ABSTRACT:
A method is provided for shifting a powershift transmission in a vehicle having an electronic engine control unit and an electronic transmission control unit. The method rapidly reduces off-going clutch pressure to a pressure which is slightly higher than a Predicted Off Slip Pressure, and rapidly increases on-coming clutch pressure P-on to a pressure that is slightly lower than a Predicted On Slip Pressure. Then, the method includes gradually decreasing P-off and gradually increasing P-on until slipping of the off-going clutch is detected, and gradually and more slowly decreasing P-off and gradually more slowly increasing P-on until the oncoming clutch begins to carry torque previously carried by the off-going clutch. Finally, the method includes more rapidly decreasing P-off to reservoir pressure, and more rapidly increasing P-on to a full on pressure.
REFERENCES:
patent: 5046383 (1991-09-01), Butts et al.
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5072390 (1991-12-01), Lentz et al.
patent: 5211079 (1993-05-01), Runde et al.
patent: 5467854 (1995-11-01), Creger et al.
patent: 5580332 (1996-12-01), Mitchell et al.
patent: 6193630 (2001-02-01), Janasek et al.
patent: 6435049 (2002-08-01), Janasek et al.
patent: 6880393 (2005-04-01), Bulgrien et al.
patent: 7008344 (2006-03-01), Aikawa et al.
Mason Joel Lee
Meyer Duane Fredrick
Deere & Company
Lewis Tisha
LandOfFree
Transmission shift control method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmission shift control method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission shift control method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3900467