Transmission hydraulic control system having a pump bypass valve

A system for providing pressurized hydraulic fluid in a transmission of a motor vehicle, the motor vehicle having an engine, the system comprising:

• a sump for storing a hydraulic fluid;
• a pump driven by the engine, the pump having an inlet port in communication with the sump and an outlet port, wherein the pump is operational to draw hydraulic fluid from the inlet port of the pump and provide pressurized hydraulic fluid to the outlet port of the pump;
• a bypass valve having an inlet port in communication with the outlet port of the pump, a first outlet port in communication with the inlet port of the pump, and a second outlet port, the bypass valve having a valve moveable between at least a first position and a second position, wherein the inlet port of the bypass valve is in communication with the second outlet port of the bypass valve when the valve is in the first position and wherein the inlet port of the bypass valve is in communication with the first outlet port of the bypass valve when the valve is in the second position;
• a control device operatively associated with the bypass valve, the control device operable to move the valve between the first position and the second position;
• and
• an accumulator in communication with the second outlet port of the bypass valve, the accumulator operable to store the hydraulic fluid,
• wherein the pump charges the accumulator with the hydraulic fluid when the valve is in the first position and wherein the valve is moved to the second position when the accumulator is fully charged.