Speed change control apparatus and method for an automatic trans

Details Speed change control apparatus and method for an automatic trans Speed change control apparatus and method for an automatic trans

1993-08-12

1995-08-29

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477132, 477155, 477161, 477164, B60K 4102

Patent

active

054455790

ABSTRACT:
A speed change control method and apparatus for a vehicular automatic transmission having a first-speed clutch for establishing a first speed and a second-speed clutch for establishing a second speed, includes subjection of at least a duty ratio Dr of a second-speed solenoid valve for supplying oil pressure to the second-speed clutch to feedback control, so that the first-speed clutch is engaged while disengaging the second-speed clutch. This thereby increases a turbine rotational speed Nt toward the first-speed synchronous rotational speed. Further, an upper limit value Dmax of the duty ratio Dr is set, and the duty ratio Dr is subject to feedback control within a resultant duty ratio range. This thereby prevents the duty ratio Dr from being set at an excessive value caused by a delay in the rise of the oil pressure. As a result, even if a depression of an accelerator pedal is suddenly increased during a downshifting process, an interlock problem can be prevented, thereby ensuring smooth speed change.

REFERENCES:
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 4922424 (1990-05-01), Hiramatsu
patent: 5029492 (1991-07-01), Kiuchi
patent: 5079705 (1992-01-01), Sakai et al.
patent: 5103694 (1992-04-01), Kobayashi et al.
patent: 5133230 (1992-07-01), Ito et al.

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