Patent ID: 8651990
Filing Date: 2014-02-18
Classification: F15B,F16H,Y10T

Abstract:
1. A hydraulic control system for actuating at least one torque transmitting device in a powertrain, the powertrain having an engine and a transmission, the hydraulic control system comprising: a source of pressurized hydraulic fluid powered by the engine; an actuator for selectively actuating the at least one torque transmitting device; a regulator valve having a first port in communication with the source of pressurized hydraulic fluid, a second port in communication with the actuator, and a third port, the regulator valve having a regulator spool valve moveable between a first position and a second position, wherein the first port of the regulator valve is not in communication with the second port of the regulator valve and the second port of the regulator valve is in communication with the third port of the regulator valve when the regulator spool valve is in the first position and wherein the first port of the regulator valve is in communication with the second port of the regulator valve and the second port of the regulator valve is not in communication with the third port of the regulator valve when the regulator spool valve is in the second position; a relay valve having a first port in communication with the third port of the regulator valve and a second port, the relay valve having a relay spool valve moveable between a first position and a second position wherein the first port of the relay valve is not in communication with the second port of the relay valve when the valve is in the first position and wherein the first port of the relay valve is in communication with the second port of the relay valve when the valve is in the second position; an accumulator for storing and releasing the hydraulic fluid, the accumulator in communication with the second port of the regulator valve and the second port of the relay valve; a first control device disposed between the accumulator and the second port of the regulator valve, the first control device having an open condition for allowing fluid communication between the accumulator and the second port of the regulator valve and a closed condition for preventing fluid communication between the accumulator and the third port of the regulator valve; a second control device disposed between the accumulator and the second port of the relay valve, the second control device having an open condition for allowing fluid communication between the accumulator and the second port of the relay valve and a closed condition for preventing fluid communication between the accumulator and the second port of the relay valve; wherein the accumulator is charged with the hydraulic fluid when the engine is on, the first control device is open, the second control device is closed, and the regulator valve is in the second position, wherein the accumulator stores the hydraulic fluid when the first control device and the second control device are closed, and wherein the accumulator activates the actuator with the hydraulic fluid when the second control device is open, the relay valve is in the second position, and the regulator valve is in the first position.