Shift control method of an automatic transmission

Details Shift control method of an automatic transmission Shift control method of an automatic transmission

2011-03-15

2011-03-15

Pang, Roger (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C701S066000

Reexamination Certificate

active

07905814

ABSTRACT:
A shift control method of an automatic transmission for controlling a shift from an nthspeed, achieved by engagement of first and second frictional elements to an (n−3)thspeed, achieved by engagement of third and fourth frictional elements. The method includes (a) beginning release control of the first element; (b) beginning release control of the second element after step (a) and after the shift is completed; (e) beginning engagement control of the third element; and (d) beginning engagement control of the fourth element after step (c). An alternative method includes (a) beginning release control of the first element; (b) beginning engagement control of the third element after step (a); (c) beginning actual engagement of the third element; (d) beginning actual release of the first element after step (c); (e) beginning engagement control of the fourth element after step (d); (f) beginning release control of the second element after step (e).

REFERENCES:
patent: 6270444 (2001-08-01), Tsutsui et al.
patent: 6616560 (2003-09-01), Hayabuchi et al.
patent: 6626786 (2003-09-01), Hayabuchi et al.
patent: 7713170 (2010-05-01), Jeon
patent: 2004/0043857 (2004-03-01), Nishida et al.

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