Device for controlling a lock-up clutch in an automatic transmis

Details Device for controlling a lock-up clutch in an automatic transmis Device for controlling a lock-up clutch in an automatic transmis

1979-11-02

1982-09-14

Braun, Leslie

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

74731, 74733, 74752C, 74869, 192 357, F16H 4704, F16H 4706

Patent

active

043490883

ABSTRACT:
A device for controlling a lock-up clutch in an automatic transmission having a lock-up clutch equipped fluid torque converter according to this invention comprises a transient release valve which receives pressurized input oil through a hydraulic passage connected to hydraulic servo means incorporated in the transmission, said transient release valve outputting pressured oil when the pressure of the input oil is higher than preset value, and a lock-up shift valve which receives the pressurized oil from the transient release valve, said lock-up shift valve being adapted for engaging the lock-up clutch when the output pressure is higher than a predetermined value and disengaging it when the pressure is lower than the predetermined value whereby the lock-up clutch is controlled by utilizing variations in hydraulic pressure supplied to the hydraulic servo means.

REFERENCES:
patent: 3096666 (1963-07-01), Christenson et al.
patent: 3638771 (1972-02-01), Chana
patent: 3752009 (1973-08-01), Chana
patent: 3857302 (1974-12-01), Morris
patent: 4046033 (1977-09-01), Hashimoto et al.
patent: 4051932 (1977-10-01), Aria et al.
patent: 4095486 (1978-06-01), Ohnuma
patent: 4145937 (1979-03-01), Shinoo et al.
patent: 4148232 (1979-04-01), Moriya

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