Method of controlling an automatic transmission

Details Method of controlling an automatic transmission Method of controlling an automatic transmission

2005-03-22

2005-03-22

Camby, Richard M. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S053000, C701S055000, C477S034000

Reexamination Certificate

active

06871130

ABSTRACT:
A downshift control method for an automatic transmission, which transmission is normally downshifted, to increase a gear ratio, when a vehicle throttle is opened more than a preset value. The method includes a step of selecting a slip-determining threshold on the basis of an instantaneous steering angle of a vehicle. The method also includes steps of detecting a perceived rear wheel speed Vs, and averaging a number of rear wheel speeds Vsto derive an average vehicle speed Va. The normal downshift procedure is overridden, and the automatic transmission is prevented from downshifting, if a difference between the perceived rear wheel speed and the average vehicle speed exceeds the slip-determining threshold T, and the rear wheels are determined to be slipping.

REFERENCES:
patent: 5544053 (1996-08-01), Nakashima
patent: 5839083 (1998-11-01), Sugiyama
patent: 6015020 (2000-01-01), Sugiyama
patent: 6070118 (2000-05-01), Ohta et al.

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