Lock-up control for torque converter

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

2008-06-16

2011-11-22

Elchanti, Hussein A. (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Clutch control

C701S051000, C701S058000

Reexamination Certificate

active

08065065

ABSTRACT:
A lock-up control system including a lock-up differential pressure generator and a controller that is programmed to: when increasing a lock-up differential pressure command value with time to establish the lock-up state of the torque converter, switch a gradient of the lock-up differential pressure command value from a first gradient to a predetermined gradient larger than the first gradient when an actual slip rotation speed is decreased to a predetermined slip rotation speed value or less; and switch the gradient of the lock-up differential pressure command value from the predetermined gradient to a second gradient smaller than the predetermined gradient when the actual slip rotation speed exceeds the predetermined slip rotation speed value again after being decreased to the predetermined slip rotation speed value or less.

REFERENCES:
patent: 4509124 (1985-04-01), Suzuki et al.
patent: 4940122 (1990-07-01), Fujieda
patent: 5667458 (1997-09-01), Narita et al.
patent: 6066069 (2000-05-01), Vorndran
patent: 6139472 (2000-10-01), Harada et al.
patent: 1 426 661 (2004-06-01), None
patent: 2004-324847 (2004-11-01), None

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