Shift control system for an automatic transmission of a vehicle

Details Shift control system for an automatic transmission of a vehicle Shift control system for an automatic transmission of a vehicle

1995-04-04

1997-06-10

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477119, 477144, F16H 5948

Patent

active

056370555

ABSTRACT:
A shift control method for an automatic transmission of a vehicle allows a kick down piston of a kick down brake in the automatic transmission to fully return after a 4-3 speed downshift operation before performing a 3-2 speed downshift operation. If it is determined that a 4-3 speed downshift signal was output by the transmission control unit, the transmission control unit is monitored to determine if a 3-2 speed downshift signal is output. A 3-2 speed downshift operation in response to a detect 3-2 speed downshift signal will then be prohibited for a predetermined period of time for the kick down piston of the kick down brake in the automatic transmission to fully return after the 4-3 speed downshift operation. Next, the 3-2 speed downshift operation will be performed in response to the 3-2 downshift signal after the predetermined period of time.

REFERENCES:
patent: 4742732 (1988-05-01), Hiramatsu
patent: 4829435 (1989-05-01), Isono
patent: 5016495 (1991-05-01), Takizawa
patent: 5054336 (1991-10-01), Takizawa
patent: 5113722 (1992-05-01), Iizuka
patent: 5161432 (1992-11-01), Matsumoto et al.
patent: 5393278 (1995-02-01), Kyushima et al.

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