Control system for automotive automatic transmission

Details Control system for automotive automatic transmission Control system for automotive automatic transmission

1993-06-10

1995-01-17

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477155, F16H 6106

Patent

active

053822013

ABSTRACT:
In a control system for an automotive automatic transmission having a friction element powered by a line pressure, a gear ratio provided by the transmission is measured. An inertial phase keeping time is measured, which is the time for which the transmission assumes an inertial phase. A line pressure adjuster is employed to adjust the line pressure in a manner to harmonize the inertial phase keeping time with a predetermined time. An inertial phase starting time is measured, which is the time elapsed until the inertial phase of the transmission starts. A line pressure increasing device is employed for increasing the line pressure irrespective of condition of the line pressure adjuster when the inertial phase starting time exceeds a first given time. An inhibitor is employed to suppress the operation of the line pressure increasing device in case wherein even when the inertial phase starting time exceeds a second given time longer than the first predetermined time, the change of the gear ratio does not occur.

REFERENCES:
patent: 4949595 (1990-08-01), Shimanaka
patent: 4953090 (1990-08-01), Narita
patent: 5046383 (1991-09-01), Butts et al.
patent: 5163342 (1992-11-01), Pollack et al.
patent: 5188005 (1993-02-01), Sankpal et al.
patent: 5191815 (1993-03-01), Kouta
patent: 5203235 (1993-04-01), Iizuka
patent: 5233889 (1993-08-01), Iizuka
patent: 5249483 (1993-10-01), Iizuka
patent: 5305665 (1994-04-01), Sano et al.

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