Control device for lockup clutch

Details Control device for lockup clutch Control device for lockup clutch

1996-07-18

1998-12-29

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Clutch control

477174, 477175, F16H 614

Patent

active

058533508

ABSTRACT:
A target engine torque Tem and a target pump torque TPm are calculated based on a target speed ratio em set in accordance with the operational state of a vehicle, and a target lockup torque TLCm is calculated by subtracting the target pump torque TPm from the target engine torque Tem. Using, as a feed-forward term, a basic linear solenoid output pressure Qbase for generating the target lockup torque TLCm in a lockup clutch, a feed-back term calculated based on a deviation de between the actual speed ratio e and the target speed ratio em is added to the basic linear solenoid output pressure Qbase, and the engage force of the lockup clutch is controlled by the resulting linear solenoid output pressure Qout. Thus, the actual speed ratio of the torque converter quickly and accurately follows the target speed ratio set in accordance with the operational state of the vehicle.

REFERENCES:
patent: 4708227 (1987-11-01), Kitade
patent: 4969545 (1990-11-01), Hayashi
patent: 5470288 (1995-11-01), Palansky et al.
patent: 5598336 (1997-01-01), Kume et al.
patent: 5616099 (1997-04-01), Sakai
patent: 5628706 (1997-05-01), Zhang

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