Shift control for a two-axis automatic transmission for a...

Details Shift control for a two-axis automatic transmission for a... Shift control for a two-axis automatic transmission for a...

2005-11-22

2005-11-22

Bonck, Rodney H. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Impeller-turbine type fluid circuit in series with planetary...

C475S116000, C475S121000, C475S122000, C475S123000, C701S054000

Reexamination Certificate

active

06966861

ABSTRACT:
A shift control method for an automatic transmission having a primary shift portion and a secondary shift portion is provided that comprises: starting, if a shift signal is output, a shift in the secondary shift portion, and then starting a shift in the primary shift portion; performing feedback control of duty ratios of friction element solenoids for the primary shift portion with a goal of approaching a change rate of a difference between an input speed and an output speed of the primary shift portion to a first target speed change rate, and simultaneously performing feedback control of duty ratios of friction element solenoids for the secondary shift portion with a goal of approaching a change rate of a turbine speed to a second target speed change rate; and completing the shift in the primary shift portion, and then completing the shift in the secondary shift portion.

REFERENCES:
patent: 5168776 (1992-12-01), Otsubo et al.
patent: 5454763 (1995-10-01), Ikebuchi et al.
patent: 5809442 (1998-09-01), Schulz et al.
patent: 5853349 (1998-12-01), Shimada et al.
patent: 5882276 (1999-03-01), Usuki et al.
patent: 6723022 (2004-04-01), Kim
patent: 2003/0027679 (2003-02-01), Sakamoto et al.

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