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

1989-01-19

1990-12-18

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

747311, 747331, B60K 4118

Patent

active

049777971

ABSTRACT:
A method of shift control in an automatic transmission having a torque converter and a shift-gear mechanism, wherein a shift map has a shift-up line and a shift-down line between each gear ratio change which is used to conduct the shift control, with a hysteresis zone being established between each shift-up line and the 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 ratio of the torque converter has been shift and also the speed below a threshold level for more than a predetermined time.

REFERENCES:
patent: 3683720 (1972-08-01), Wakamatsu et al.
patent: 3805640 (1974-04-01), Schneider et al.
patent: 4700819 (1987-10-01), Nishikawa et al.
patent: 4729461 (1988-03-01), Nishikawa et al.
patent: 4730520 (1988-03-01), Nishikawa et al.
patent: 4733581 (1988-03-01), Hasegawa et al.
patent: 4843918 (1989-07-01), Morimoto

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