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A frictional engagement assembly for an automotive device, including: at least one frictionally engageable plate; a first piston plate displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact; a first resilient element engaged with the fi

A frictional engagement assembly for an automotive device, including: at least one frictionally engageable plate; a first piston plate displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact; a first resilient element engaged with the first piston plate and urging the first piston plate in a second axial direction substantially opposite the first axial direction; a check valve controlling fluid flow to displace the first piston plate; and an accumulator. As fluid from a chamber, at least partially formed by the first piston plate, discharges through the check valve, the accumulator controls fluid volume in the chamber to maintain a distal portion of the first piston plate, urging the at least one frictionally engageable plate into frictional contact, in a furthest position in the first axial direction.

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1. A frictional engagement assembly for an automotive device, including: at least one frictionally engageable plate;a first piston plate displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact;a first resilient element engaged with the f

1. A frictional engagement assembly for an automotive device, including: at least one frictionally engageable plate;a first piston plate displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact;a first resilient element engaged with the first piston plate and urging the first piston plate in a second axial direction substantially opposite the first axial direction;a check valve controlling fluid flow to displace the first piston plate; and,an accumulator, wherein, as fluid from a chamber, at least partially formed by the first piston plate, discharges through the check valve, the accumulator controls fluid volume in the chamber to maintain a distal portion of the first piston plate, urging the at least one frictionally engageable plate into frictional contact, in a furthest position in the first axial direction. 2. The frictional engagement assembly of claim 1 wherein the check valve includes a second resilient element engaged with an outlet side of an inner sleeve, wherein the second resilient element exerts a first force, wherein, when a sum of a force exerted by a fluid pressure on the outlet side of the plate plus the first force is less than a sum of a force exerted by fluid pressure exerted on an inlet side of the inner sleeve, the inner sleeve is displaceable to a first position to enable fluid flow through the check valve to the chamber, wherein, when the sum is greater than a sum of a force exerted by fluid pressure exerted on the inlet side of the inner sleeve, the inner sleeve is displaceable to a second position to block fluid flow through the check valve, and wherein the accumulator controls fluid volume in the chamber as the inner sleeve translates from the first position to the second position. 3. The frictional engagement assembly of claim 2 wherein when the distal portion of the first piston plate is in the furthest position in the first axial direction and the inner sleeve is in the first position, the first piston plate is positioned to create a first volume in the chamber, wherein as the inner sleeve translates from the first position to the second position, the first piston plate flexes in the second direction to create a second volume in the chamber, and wherein a difference between the first and second volumes is substantially equal to the fluid volume passing through the check valve from the chamber as the inner sleeve translates from the first position to the second position. 4. The frictional engagement assembly of claim 2 wherein the accumulator includes a second piston plate and a third resilient element engaged with the first and second piston plates, where the third resilient element exerts a second force, the chamber is at least partially formed by the second piston plate, and the second piston plate is displaceable in the first axial direction to compress the third resilient element against the first piston plate as force exerted by fluid in the chamber on the second piston plate exceeds the second force. 5. The frictional engagement assembly of claim 4 wherein as the inner sleeve translates from the first position to the second position, the second plate displaces in the second direction and the third resilient element reacts against the first piston plate to maintain the distal portion of the first piston plate in the furthest position in the first axial direction. 6. The frictional engagement assembly of claim 2 wherein the check valve includes a fourth resilient element applying a third force to a plate and a first orifice, wherein the inner sleeve includes second and third orifices and at least one groove on an inner surface of the inner sleeve, wherein when the inner sleeve is in the second position and force on an outlet side of the plate is less than a sum of the third force and force exerted by fluid pressure on an inlet side of the plate, the plate blocks the second orifice and when the inner sleeve is in the second position and the force on the outlet side of the plate is greater than the sum of the third force and force exerted by fluid pressure on the inlet side of the plate, the plate moves from the second orifice to enable flow from the chamber through the at least one groove and the first, second, and third orifices, and wherein at least one of the at least one groove and the first, second, and third orifices is sized to control a time period necessary to discharge fluid in the chamber. 7. The frictional engagement assembly of claim 1 wherein the automotive device is selected from the group consisting of an automatic transmission and a torque converter. 8. The frictional engagement assembly of claim 1 wherein the frictional engagement assembly includes a wet clutch pack or a brake. 9. A method of controlling a frictional engagement in an automotive device, including the steps of: displacing a portion of a check valve to a first position to create an opening from a channel to a chamber at least partially formed by a first piston plate;flowing fluid through the check valve to the chamber;displacing, in response to flowing the fluid, the first piston plate in a first axial direction to urge at least one frictionally engageable plate into frictional engagement, such that a distal portion of the first piston plate, urging the at least one frictionally engageable plate into frictional engagement, is in a furthest position in the first axial direction;displacing the portion of the check valve to a second position to block the opening; and,controlling fluid volume in the chamber to maintain the distal portion of the first piston plate in the furthest position as the portion translates from the first position to the second position. 10. The method of claim 9 wherein controlling fluid volume in the chamber includes compensating for a fluid volume passing through the check valve from the chamber as the portion translates from the first position to the second position. 11. The method of claim 9 wherein controlling fluid volume in the chamber includes flexing the first piston plate to create a first volume in the chamber when the distal portion of the first piston plate is in the furthest position in the first axial direction and the portion is in the first position, and flexing the first piston plate in the second axial direction to create a second volume in the chamber as the portion translates from the first position to the second position, such that a difference between the first and second volumes is substantially equal to the fluid volume passing through the check valve from the chamber as the portion translates from the first position to the second position. 12. The method of claim 9 wherein displacing the first piston plate in a first axial direction includes displacing, in response to flowing the fluid, a second piston plate to compress a second resilient element disposed between the first and second piston plates and wherein controlling fluid volume in the chamber includes the second resilient element displacing the second plate in the second direction to maintain the distal portion of the first piston plate in the furthest position in the first axial direction as the portion translates from the first position to the second position. 13. The method of claim 9 wherein the automotive device is selected from the group consisting of an automatic transmission and a torque converter. 14. The method of claim 9 wherein the frictional engagement assembly includes a wet clutch pack or a brake. 15. The method of claim 9 wherein the check valve includes a first orifice and the portion includes a second orifice and at least one groove on an inner surface of the portion and, the method further including: displacing a plate to close a third orifice in the portion when the portion is in the second position and force on an outlet side of the plate is less than force on an inlet side of the plate;displacing the plate to open the third orifice when the portion is in the second position and the force on the outlet side of the plate is greater than the force on the inlet side of the plate; and,discharging the fluid in the chamber though the check valve in a time period according to a size of at least one of the at least one groove and the first, second, and third orifices. 16. A wet clutch pack assembly for an automotive device, including: at least one frictionally engageable plate;first and second piston plates displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact;a check valve controlling fluid flow to displace the second piston plate; and,a resilient element engaged with the first and second piston plates, wherein, as fluid from a chamber, at least partially formed by the second piston plate, discharges through the check valve, the resilient element displaces the second plate in the second direction to control fluid volume in the chamber and the resilient element reacts against the first piston plate to maintain a distal portion of the first piston plate, urging the at least one frictionally engageable plate into frictional contact, in a furthest position in the first axial direction.