Lock-up clutch slip control device

Details Lock-up clutch slip control device Lock-up clutch slip control device

1995-07-14

1997-09-02

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Clutch control

With fluid drive

477176, F16H 6114

Patent

active

056625529

ABSTRACT:
To prevent an alteration of the target slip amount of a lock-up clutch slip control due to changes over time of a automatic transmission, and moreover to improve fuel consumption without reducing drivability, a lock-up clutch is mounted inside a torque converter. Inside the lock-up clutch, operational oil is supplied while switching between a release state and an engaged state of the clutch according to the switching function of a clutch control solenoid. Furthermore, the arbitrary slip amount (slip rate) is regulated using these two components. As a result of these controls, there is mapping of the target slip amount in the operating ranges having as parameters the throttle aperture change rate and turbine rotational speed of a throttle valve included on the intake pipe of the internal combustion engine and the turbine rotational speed of the torque converter. If the throttle aperture change rate goes above a predetermined value, the target slip amounts of the operating ranges are updated based on the target slip amount of the operating range at that time.

REFERENCES:
patent: 4872540 (1989-10-01), Sekine et al.
patent: 5086894 (1992-02-01), Iizuka et al.
patent: 5143191 (1992-09-01), Nobumoto et al.
patent: 5190130 (1993-03-01), Thomas et al.
patent: 5569117 (1996-10-01), Kono et al.

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