| 摘要 |
A system for pressurizing a friction element of an automatic transmission supplied concurrently from two hydraulic passages through a shuttle valve where the two sources of supply pressure are combined. A control valve proeduces regulated output pressure by balancing control feedback pressure against a spring force without venting any portion of the system. The shuttle valve includes a shuttle ball for sealing ports connected to both supply sources and maintains an open connection between the direct clutch and a pocket in which the shuttle ball is retained. AN accumulator includes a plunger separating first and second volumes. One volume expands as hydraulic fluid at regulated output pressure exits the control valve. The volume expands at a regulated time rate controlled by the magnitude of TVLM control pressure, a compression spring force and the flow rate through an orifice of predetermined size.
|
