Lock-up apparatus controlling timing of initiation of lock-up cl

Details Lock-up apparatus controlling timing of initiation of lock-up cl Lock-up apparatus controlling timing of initiation of lock-up cl

1996-10-25

1998-05-26

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

477174, 192 33, F16H 6114

Patent

active

057556385

ABSTRACT:
A lock-up apparatus is provided which includes: a lock-up clutch that divides an interior of a hydraulic power transmitting device into an apply chamber and a release chamber and operating according to a pressure difference between the apply chamber and the release chamber; a lock-up solenoid that generates a control oil pressure that varies with a duty ratio of a power pulse signal supplied thereto; and a pressure regulating valve that selectively supplies or discharge oil to or from the apply chamber and the release chamber, through first and second oil paths, respectively, with an oil pressure of the second oil path being applied against the control oil pressure, so as to regulate the oil pressure of the second oil path. The lock-up apparatus further includes a control device that starts changing the duty ratio from an initial value at a rate of change in response to a command to start engagement of the lock-up clutch, thereby to control an engaging process of the lock-up clutch. The control device controls the initial value and/or the rate of change according to a pressure level of the oil supplied to the second oil path in response to the command to start engagement of the lock-up clutch, so as to substantially fix a period of time measured from a point of time when the control oil pressure starts being changed until a point of time when the pressure regulating valve starts operating.

REFERENCES:
patent: 4819777 (1989-04-01), Yasue et al.
patent: 5082095 (1992-01-01), Imamura
patent: 5160002 (1992-11-01), Suzuki
patent: 5332073 (1994-07-01), Iizuka

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