Method and apparatus for synchronizing low to high transfer case

Details Method and apparatus for synchronizing low to high transfer case Method and apparatus for synchronizing low to high transfer case

1996-05-10

1998-06-23

Nguyen, Tan Q.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 61, 701 67, 701 69, 180247, 180248, 475295, B60K 17346, F16H 3708

Patent

active

057714770

ABSTRACT:
A method and apparatus for operating a power transfer device such as a vehicle transfer case having, shaft speed sensors, a two speed (high-low) drive assembly, an electrically, pneumatically or hydraulically operated shift operator and a microprocessor comprising the steps of sensing the speeds of the transfer case input shaft and output shaft, calculating the rate of change (.DELTA.S/.DELTA.t) of the speed of the input shaft, predicting, based upon such rate of change, a time when the input shaft and the output shaft will be synchronized and commencing movement of such shift operator at a time prior to such synchronization in order to effect engagement of such clutch into high gear at substantially the instant of synchronization.

REFERENCES:
patent: 4718303 (1988-01-01), Fogelberg
patent: 4828070 (1989-05-01), Maramatsu
patent: 5407024 (1995-04-01), Watson et al.
patent: 5409429 (1995-04-01), Showalter et al.
patent: 5662543 (1997-09-01), Forsyth
patent: 5674147 (1997-10-01), Tobita et al.

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