System and method for controlling down shifting of vehicle autom

Details System and method for controlling down shifting of vehicle autom System and method for controlling down shifting of vehicle autom

1994-06-10

1996-09-10

Park, Collin W.

Boots, shoes, and leggings

395900, 477120, 477901, 477904, B60K 4106

Patent

active

055551700

ABSTRACT:
Shift control system and method are provided for use in a vehicle automatic transmission in which a desired speed range is achieved in accordance with the state of driving of a vehicle. The degree of meandering of a running road on which the vehicle is running is detected. The downhill grade of the running road is also detected. Based on the detection results, it is determined whether or not the running road is a meandering downhill road. When it is determined that the vehicle is running on the meandering downhill road, it is then determined whether or not a downshift is needed. When the downshift has been determined to be necessary, the speed range of the vehicle automatic transmission is shifted from a current speed range to a speed range lower than the current speed range.

REFERENCES:
patent: 5101350 (1992-03-01), Tokoro
patent: 5124916 (1992-06-01), Tokoro et al.
patent: 5235876 (1993-08-01), Minowa et al.
patent: 5361207 (1994-11-01), Hayafune
patent: 5389050 (1995-02-01), Sakai et al.
patent: 5390116 (1995-02-01), Hayafune
patent: 5428531 (1995-06-01), Hayafune

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