Hydraulic control for a vehicle powertrain

Details Hydraulic control for a vehicle powertrain Hydraulic control for a vehicle powertrain

2009-04-22

2011-11-15

Dickson, Paul N (Department: 3616)

Motor vehicles

With fluid or mechanical means to accumulate energy to power...

C477S050000, C060S412000, C184S006120

Reexamination Certificate

active

08056666

ABSTRACT:
A vehicle powertrain includes an engine capable of being selectively turned on and turned off, a transmission operatively connected to the engine, and a hydraulic control system including a pump in fluid communication with the transmission. The pump is operatively connected to the engine for supplying fluid to the transmission when the engine is on, wherein the pump is idle when the engine is off. The hydraulic control system additionally includes an accumulator arranged to accumulate the fluid when the engine is on. The accumulator is also controlled to accumulate fluid when the engine is on, to retain the fluid when the engine is turned off, and to discharge the fluid to the transmission when the engine is restarted.

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