Lubrication management system for a transmission having a high speed clutch

A lubricant management system for a work vehicle transmission unit having a drive shaft and a gear selectively coupled to the drive shaft by a clutch assembly having a clutch piston contained in a clutch piston cavity configured to receive fluid under pressure and a clutch pack, the lubricant management system comprising:

• a balance piston contained in a balance piston cavity configured to receive fluid under pressure and provided between the clutch piston and the balance piston;
• a cooling fluid shutoff piston mounted in a passageway of the clutch piston, the passageway being open to the balance piston cavity and having a lubrication supply opening that is in an open position when the cooling fluid shutoff piston is not within the lubrication supply opening and that is in a closed position when the cooling fluid shutoff piston is within the lubrication supply opening;
• a valve configured to control pressure of fluid flow into the clutch piston cavity;
• and
• a controller, having processing and memory architecture, operatively coupled to the valve and configured to:
• command the valve to adjust the pressure of the fluid flowing into the clutch piston cavity during operation of the clutch assembly;
• and
• prior to a shift command the valve to open to allow fluid flow under a pressure into the clutch piston cavity to fast fill the clutch piston cavity, and then reduce the pressure into the clutch piston cavity;
• and
• at a start of the shift command the valve to reopen to allow fluid flow under a pressure into the clutch piston cavity which is less than a pressure required to maintain the cooling fluid shutoff piston in the closed position.