Shift control system for automatic transmission

Details Shift control system for automatic transmission Shift control system for automatic transmission

1996-02-26

1997-06-03

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

475120, 477109, F16H 6106, F02D 2900

Patent

active

056348690

ABSTRACT:
A shift control system can perform clutch-to-clutch shifts without occurrence of delay in shifting operation and aggravation of shift shock, by decreasing an engaging force of a first frictional engagement device and increasing an engaging force of a second frictional engagement device, and comprises a low pressure retention instructer for maintaining the second frictional engagement device at a predetermined low level until a revolution speed of a rotary member reaches a predetermined value upon the shift, an engagement instructer for increasing the engaging force of the second frictional engagement device after the revolution speed of the rotary member has reached said predetermined value, and a pressure rise instructer for increasing the engaging force of the first frictional engagement device after increasing the engaging force of the second frictional engagement device.

REFERENCES:
patent: 4662488 (1987-05-01), Hiramatsu et al.
patent: 4955256 (1990-09-01), Kashihara et al.
patent: 5014573 (1991-05-01), Hunter et al.
patent: 5072390 (1991-12-01), Lentz et al.
patent: 5335567 (1994-08-01), Seidel et al.
patent: 5383820 (1995-01-01), Mori
patent: 5401219 (1995-03-01), Kimura et al.

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