Control device for lockup clutch

Details Control device for lockup clutch Control device for lockup clutch

1996-10-21

1999-04-13

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 331, 192109F, 477169, F16D 3300

Patent

active

058934383

ABSTRACT:
A facing surface of a clutch piston is previously moved to a position just before it abuts against an inner surface of a torque converter cover, or a position in which it extremely slightly abuts against the inner surface of the torque converter cover by outputting an initial engage pressure YMIN set in accordance with a vehicle speed and the like only for a predetermined time TMPS prior to the start of engagement of a lockup clutch. When the engagement of the lockup clutch is started, the engage pressure is gradually increased. When the engage pressure approaches a target pressure set in accordance with the target speed ratio, a feedback control of the engage pressure is carried out such that the actual speed ratio of the torque converter is converged to the target speed ratio. Thus, when the lockup clutch of the torque converter is brought into an engaged state, the responsiveness can be enhanced while preventing the generation of a shock.

REFERENCES:
patent: 5086894 (1992-02-01), Iizuka et al.
patent: 5484354 (1996-01-01), Vukovich et al.
patent: 5491635 (1996-02-01), Foeldi et al.
patent: 5531302 (1996-07-01), Koienig et al.

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