System for preventing inadvertent application of torque converte

Details System for preventing inadvertent application of torque converte System for preventing inadvertent application of torque converte

1993-06-24

1994-12-13

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

747321, F16H 4502

Patent

active

053722264

ABSTRACT:
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.

REFERENCES:
patent: 3730315 (1973-05-01), Annis et al.
patent: 3977502 (1976-08-01), Chana
patent: 4441385 (1984-04-01), Taga et al.
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4876923 (1989-10-01), Crandall et al.
patent: 4880091 (1989-11-01), Hasegawa et al.
patent: 4989702 (1991-02-01), Yoshimura et al.

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