Lock-up control for torque converter

Details Lock-up control for torque converter Lock-up control for torque converter

2007-10-30

2007-10-30

Lorence, Richard M (Department: 3681)

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

C192S003310, C477S065000, C701S067000

Reexamination Certificate

active

11088264

ABSTRACT:
A lock-up clutch control device controls a lock-up clutch provided in a torque converter mounted between an engine and a transmission of a vehicle. The lock-up clutch control device switches between a converter state and a lock-up state by controlling a differential pressure supplied to the lock-up clutch. The lock-up clutch control device has a controller and a differential pressure generator for generating the differential pressure in response to a differential pressure command value. The controller calculates a first differential pressure command value which decreases at a predetermined rate, after the vehicle speed becomes a first predetermined speed; sets the differential pressure command value to a second differential pressure command value, before the vehicle speed becomes a second predetermined speed; and sets the differential pressure command value to a value at which the lock-up clutch is immediately released, when the vehicle speed becomes the second predetermined speed.

REFERENCES:
patent: 5332073 (1994-07-01), Iizuka
patent: 5609551 (1997-03-01), Sakai
patent: 5752895 (1998-05-01), Sugiyama et al.
patent: 5947865 (1999-09-01), Watanabe et al.
patent: 6139472 (2000-10-01), Harada et al.
patent: 2002/0019293 (2002-02-01), Noda et al.
patent: 2005/0222737 (2005-10-01), Imamura et al.
patent: 08170725 (1996-07-01), None
patent: 11-223263 (1999-08-01), None

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