Shift control method for an automatic transmission based upon sl

Details Shift control method for an automatic transmission based upon sl Shift control method for an automatic transmission based upon sl

1997-01-02

1999-02-02

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 43, 701 60, F16H 6108

Patent

active

058657070

ABSTRACT:
A shift control for a shift-down operation is executed by carrying out the following stages in order: an off-going range releasing stage STO1 which quickly lowers the engagement actuation pressure of the off-going engaging element to an engagement-releasing pressure; an off-going range controlling stage STO2, STO3 and STO4 which sets the engagement actuation pressure of the off-going engaging element to a pressure a little higher than the engagement-releasing pressure; an on-coming range void-stroke-clearing stage STR1 which sets the engagement actuation pressure of the on-coming engaging element to a predetermined high-pressure necessary for clearing the void stroke; an on-coming range waiting stage STR2 and STR3 which sets the engagement actuation pressure of the on-coming engaging element to a stand-by pressure necessary for retaining the on-coming engaging element in stand-by condition prior to engagement; an off-going range final stage which releases the off-going engaging element completely; and an on-coming range final stage which engages the on-coming engaging element completely.

REFERENCES:
patent: 4796490 (1989-01-01), Butts et al.
patent: 5038636 (1991-08-01), Vukovich et al.
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5113343 (1992-05-01), Hunter et al.
patent: 5211079 (1993-05-01), Runde et al.
patent: 5370016 (1994-12-01), Fujita et al.

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