| 摘要 |
In a circuit for controlling the engaged and disengaged state of a torque converter lockup clutch 54 supplied with pressurized fluid on alternate side of a clutch piston, a first valve 116 regulating magnitude of pressure in a lock circuit 104, 106, 124, which causes the lockup clutch to engage, and maintains a pressure differential between lock pressure and unlock pressure, which causes the lockup clutch to disengage. A shuttle valve 122, supplied with control pressure from a solenoid-operated valve 94 when the lockup clutch is engaged, prevents fluid at lock pressure venting from the lock circuit.
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