Automatic transmission

Details Automatic transmission Automatic transmission

2006-05-25

2008-12-02

Ho, Ha D. (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

07458912

ABSTRACT:
An automatic transmission includes a planetary gear train of first, second, third and fourth planetary gears; an input rotation member connected with a ring gear of the second planetary gear; and a first connection member connecting a carrier of the second planetary gear and a ring gear of the fourth planetary gear. A first rotation sensor senses the rotation speed of the first connection member. A second rotation sensor senses the rotation speed of one rotating element of the first and second planetary gears. A processing section calculates an input speed of the automatic transmission from the rotation speeds sensed by the first and second rotation sensors.

REFERENCES:
patent: 5938559 (1999-08-01), Sumi
patent: 6811512 (2004-11-01), Usoro et al.
patent: 7128683 (2006-10-01), Oguri et al.
patent: 7163484 (2007-01-01), Klemen
patent: 7318787 (2008-01-01), Tabata et al.
patent: 7337051 (2008-02-01), Ota et al.
patent: 7364527 (2008-04-01), Klemen
patent: 7384364 (2008-06-01), Jang
patent: 10-030688 (1998-02-01), None

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