Shift control system for automobile automatic transmission

Details Shift control system for automobile automatic transmission Shift control system for automobile automatic transmission

1992-09-23

1994-06-14

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477155, F16H 6108

Patent

active

053200004

ABSTRACT:
A particular shift control system is provided for an automatic transmission having a primary transmission, changeable to at least three primary gear ratios, and a secondary transmission, changeable to at least two secondary gear ratios. The primary and secondary transmissions combine to shift the automatic transmission to a plurality of forward speeds. The control system monitors the progression of change in the primary transmission gear ratio. In a specific automotive drive condition, the primary transmission changes from one primary gear ratio to another primary gear ratio via an intermediate primary gear ratio between the two primary gear ratios. This produces an increase or decrease in a primary gear ratio. At the same time, the secondary transmission decreases or increases, respectively, a secondary gear ratio so as to shift the automatic transmission from one forward speed to another, skipping an intermediate speed between the two forward speeds. The secondary transmission starts a change in a secondary gear ratio in an opposite direction only when a primary gear ratio of the primary transmission reaches the intermediate primary gear ratio.

REFERENCES:
patent: 4674364 (1987-06-01), Shindo et al.
patent: 4934215 (1990-06-01), Miura et al.
patent: 4984485 (1991-01-01), Kojima et al.
patent: 5067373 (1991-11-01), Kyohzuka et al.
patent: 5094130 (1992-03-01), Hirose et al.
patent: 5131298 (1992-07-01), Marusue
patent: 5195036 (1993-03-01), Kimura et al.

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