Forward clutch and lockup clutch control in an automatic transmi

Details Forward clutch and lockup clutch control in an automatic transmi Forward clutch and lockup clutch control in an automatic transmi

1996-01-30

1998-03-10

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

747331, 477168, F16H 6100

Patent

active

057254559

ABSTRACT:
A hydraulic control system for an automatic transmission having at least a forward clutch which is unlocked in a fourth gear and locked in other forward gears and a lock-up clutch for coupling input and output elements of a torque converter together is equipped with a pressure control valve for controlling operating pressure for the forward clutch, a lock-up control valve for connecting and disconnecting the first valve from the lock-up clutch, a pressure line through which control source pressure is introduced into the forward clutch while the first valve is in communication with the lock-up clutch, and a shift valve for discharging the control source pressure from the pressure line.

REFERENCES:
patent: 2749775 (1956-06-01), Simpson
patent: 4431095 (1984-02-01), Suga
patent: 4441385 (1984-04-01), Taga et al.
patent: 4603601 (1986-08-01), Nishikawa et al.
patent: 5179874 (1993-01-01), Hunter
patent: 5383379 (1995-01-01), Niiyama
patent: 5417622 (1995-05-01), Asayama et al.

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