Method of shift control in an automatic transmission

Details Method of shift control in an automatic transmission Method of shift control in an automatic transmission

1989-02-10

1991-07-30

Hermann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

F16H 5918

Patent

active

050351575

ABSTRACT:
A method of shift control in an automatic transmission, wherein a shift map has a shift-up line and a shift-down line between each gear change which is used to conduct the shift control with a hysteresis zone being established between each shift-up line and shift-down line. The method includes the steps of shifting down a speed range when a point representing a traveling state on the shift map moves in the lower vehicle speed direction and crosses the shift-down line, shifting up a speed range when the point moves in the higher vehicle speed direction and crosses the shift-up line, and shifting down the speed range when the point is in the hysteresis zone after a shift and also the increasing rate of the engine power is greater than a specified value.

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