Speed change control apparatus for an automatic transmission

Details Speed change control apparatus for an automatic transmission Speed change control apparatus for an automatic transmission

1995-11-14

1997-03-11

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477906, F16H 6112

Patent

active

056095490

ABSTRACT:
A speed change control apparatus of an automatic transmission has a transmission control unit. When determining a fault of a power-on/off determining section on the basis of engine load information from an engine control unit, the transmission control unit controls an oil pressure controller by regarding an engine as being in a power-on state in upshifting and by regarding the engine as being in a power-off state in downshifting. As a result, in either of upshifting and downshifting, the moment when a disengagement-side friction element of the transmission begins to slip and the moment when an engagement-side friction element is engaged are made proper. This makes it possible to surely prevent undesired rise in the engine rotation during the speed change in upshifting and inability in speed change in downshifting, which are caused by a fault of the power-on/off determining section.

REFERENCES:
patent: 5345843 (1994-09-01), Fujita et al.
patent: 5366424 (1994-11-01), Wataya
patent: 5370016 (1994-12-01), Fujita et al.
patent: 5435796 (1995-07-01), Fujita et al.
patent: 5443432 (1995-08-01), Fujita et al.
patent: 5445577 (1995-08-01), Fujita et al.
patent: 5445579 (1995-08-01), Fujita et al.

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