Vehicular automatic transmission and apparatus and method for co

Details Vehicular automatic transmission and apparatus and method for co Vehicular automatic transmission and apparatus and method for co

1997-08-12

1999-07-20

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

475120, 475129, 477154, F16H 6108

Patent

active

059250860

ABSTRACT:
In apparatus and method for controlling a gear shift of a vehicular automatic transmission, the automatic transmission the automatic transmission having a releasing frictional element, a clutching frictional element, and a source of a releasing working liquid pressure to be applied to the releasing frictional element and a clutching working liquid pressure to be applied to the clutching frictional element, a gear shift in the automatic transmission being carried out by a shift from the releasing frictional element to the clutching frictional element, during a time duration from a time at which a gear shift instruction is outputted to a time at which a torque phase is started, the releasing working liquid pressure is reduced and reached without undershooting to a first predetermined working liquid pressure value under which the releasing frictional element is in a state immediately before an occurrence of a slip and the clutching working liquid pressure is set at least a second predetermined working liquid pressure value under which the clutching element is in a state immediately before a clutching.

REFERENCES:
patent: 4730519 (1988-03-01), Nakamura et al.
patent: 5478288 (1995-12-01), Sakakibara et al.
patent: 5611752 (1997-03-01), Kamada et al.
patent: 5733220 (1998-03-01), Iizuka
patent: 5839988 (1998-11-01), Marusue et al.
patent: 5865708 (1999-02-01), Nishio et al.

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