Control system and method for automatic transmission

Details Control system and method for automatic transmission Control system and method for automatic transmission

2008-01-24

2010-06-15

Wright, Dirk (Department: 3655)

Machine element or mechanism

Gearing

Interchangeably locked

Reexamination Certificate

active

07735388

ABSTRACT:
A worsening of drivability is to be kept to a minimum by making a fail-safe control taking the state in the event of failure of a shifting operation into account. When clamping a sleeve to a free rotatable gear and during the period after instructing movement of the sleeve to a clamping position until movement of the sleeve to a predetermined positional range which makes it possible to judge that the sleeve has been clamped to the free rotatable gear, a pushing load for the sleeve is increased if the sleeve is in a fixed state near the balk ring, while if the sleeve is in a fixed state near the free rotatable gear, the sleeve is once returned to a neutral position thereof and is re-clamped to the free rotatable gear. Further, the number of times the sleeve is re-clamped to the free rotatable gear is counted and the use of the free rotatable gear is inhibited in accordance with the counted number of times.

REFERENCES:
patent: 6070117 (2000-05-01), Yamada et al.
patent: 6276224 (2001-08-01), Ueda et al.
patent: 6884200 (2005-04-01), Shimaguchi
patent: 6997075 (2006-02-01), Serebrennikov et al.
patent: 7222552 (2007-05-01), Kouno et al.
patent: 11-82710 (1999-03-01), None

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