Control of lock-up clutch

Details Control of lock-up clutch Control of lock-up clutch

2007-10-16

2007-10-16

Pang, Roger (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

C477S084000, C477S169000

Reexamination Certificate

active

11240644

ABSTRACT:
A lock-up clutch control device, which controls a lock-up clutch (6) installed in a torque converter (5) interposed between an engine (3) and a transmission (4) used with a vehicle, is disclosed. The lock-up clutch control device has a differential pressure generating device (7,8) which engages or disengages the lock-up clutch by adjusting a differential pressure supplied to the lock-up clutch, a sensor (13) which detects a vehicle speed, and a controller. The controller is programmed to: determine whether or not the vehicle speed is equal to or larger than a first threshold value (V1) corresponding to a lock-up ON vehicle speed; command the differential pressure generating device to engage the lock-up clutch, when the vehicle speed is equal to or larger than the first threshold value (V1); determine whether or not the vehicle speed has reached a second threshold value (V2) larger than the first threshold value (V1); set a lock-up OFF threshold value (V3/V4) which depends on whether the vehicle speed has reached the second threshold value (V2); and command the differential pressure generating device to disengage the lock-up clutch, when the vehicle speed is equal to or less than the lock-up OFF threshold value.

REFERENCES:
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patent: 6860834 (2005-03-01), Segawa et al.
patent: 2005/0222737 (2005-10-01), Imamura et al.
patent: 2002-205576 (2002-07-01), None

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