Patent ID: 8375710

Claim:
A hydraulic control system in a powertrain, the powertrain having a transmission and an engine, the hydraulic control system comprising: a sump for storing a hydraulic fluid; a pump having an inlet in communication with the sump and an outlet, wherein the pump is powered by the engine; a valve system in communication with the outlet of the pump, wherein the valve system is operable to control the transmission; an accumulator for storing and releasing the hydraulic fluid, the accumulator in communication with the outlet of the pump and with the valve system; a first control device disposed between the accumulator and the valve system, the first control device having an open condition for allowing fluid communication between the accumulator and the valve system and a closed condition for preventing fluid communication between the accumulator and the valve system; a second control device disposed between the accumulator and the inlet of the pump, the second control device having an open condition for allowing fluid communication between the accumulator and the inlet of the pump and a closed condition for preventing fluid communication, between the accumulator and the inlet of the pump, and wherein the second control device is a thermal regulator device operable to sense a temperature; wherein the accumulator is charged with the hydraulic fluid when the engine is on and the pump is powered, wherein the accumulator stores the hydraulic fluid when the first control device and the second control device are in the closed condition, wherein the accumulator releases the hydraulic fluid and charges the valve system when the first control device is in the open condition, and wherein the accumulator releases the hydraulic fluid and charges the pump when the second control device is in the open condition.