Line pressure control apparatus of automatic transmission

Details Line pressure control apparatus of automatic transmission Line pressure control apparatus of automatic transmission

1997-10-23

1999-05-25

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Impeller-turbine type fluid circuit in series with planetary...

475118, 475120, 477158, 477175, F16H 6114

Patent

active

059065567

ABSTRACT:
A line pressure control apparatus of an automatic transmission controls the line pressure of the automatic transmission under a lockup condition to ensure an engagement capacity and an amount of lubrication oil for an engaged friction element under a high vehicle speed condition. The line pressure control apparatus comprises a line pressure lowering section, a vehicle speed deciding section and a pressure changing section. The pressure lowering section lowers a line pressure under a lockup condition of the automatic transmission. The vehicle speed deciding section decides whether a vehicle speed of the automotive vehicle is higher than a predetermined value. The pressure changing section changes the line pressure under the lockup condition from the lowered line pressure to a line pressure under a normal condition when the vehicle speed is higher than the predetermined value.

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patent: 5641043 (1997-06-01), Niiyama
patent: 5733223 (1998-03-01), Matsubara et al.

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