Coast downshift control apparatus for a vehicular automatic tran

Details Coast downshift control apparatus for a vehicular automatic tran Coast downshift control apparatus for a vehicular automatic tran

1999-03-15

2000-07-18

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

477118, 477180, 477124, 477156, B60K 4102

Patent

active

060900083

ABSTRACT:
In a vehicular automatic transmission, a coast downshift is executed in an appropriate engine-braking state and with a light gearshift shock. While predetermined conditions for the execution of the downshift are met, an oil pressure to be fed to a clutch (c12 in FIG. 1) on the side of a gearshift output stage (a lower speed stage) is controlled, for example, in order that the input shaft speed (turbine speed01 in FIG. 1) of the automatic transmission may agree with a desired value adapted to keep the weak engine-braking state.

REFERENCES:
patent: 4653351 (1987-03-01), Downs et al.
patent: 4671139 (1987-06-01), Downs et al.
patent: 5036729 (1991-08-01), Nitz et al.
patent: 5441464 (1995-08-01), Markyvech
patent: 5445576 (1995-08-01), Motamedi et al.
patent: 5634867 (1997-06-01), Mack
patent: 5954776 (1999-09-01), Saito et al.

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