Power plants – Pressure fluid source and motor – Having condition responsive control in a system of...
Reexamination Certificate
2008-04-25
2011-11-01
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of...
C060S329000, C060S337000
Reexamination Certificate
active
08046991
ABSTRACT:
A torque converter coupled to a transmission has a torque converter operating mode and a lockup operating mode. A first pump may be configured to supply transmission fluid to a plurality of electro-hydraulic transmission components. A second pump may be configured to supply transmission fluid to a lubrication system of the transmission. A valve may be configured to route transmission fluid supplied by the second pump through the torque converter during the torque converter operating mode. Means may also be provided for selectively routing at least some of the transmission fluid supplied by the first pump through the torque converter. Illustratively, transmission fluid supplied by the first pump may, but need not, be routed to the torque converter only during the torque converter operating mode or only during the torque converter operating mode if the temperature of transmission fluid exiting the torque converter exceeds a threshold temperature.
REFERENCES:
patent: 2638746 (1953-05-01), Kelley
patent: 3635026 (1972-01-01), Hahn et al.
patent: 5762134 (1998-06-01), Droste et al.
Allison Transmission, Inc.
Barnes & Thornburg LLP
Leslie Michael
LandOfFree
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