Automatic transmission control apparatus

Details Automatic transmission control apparatus Automatic transmission control apparatus

1996-06-12

1998-04-21

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477120, F16H 6106

Patent

active

057412030

ABSTRACT:
An apparatus for controlling an automatic transmission including hydraulic friction elements each of which is operable between engaged and disengaged positions in response to a working pressure of hydraulic fluid supplied thereto so as to produce a selected one of a plurality of modes of gear change. The control apparatus is operable through successive operating modes including a precharge mode of precharging the hydraulic fluid to a corresponding one of the friction elements to complete a loss stroke of the friction element, a critical pressure retaining mode of retaining the working pressure at a critical value and a feedback control mode of controlling the working pressure. A different of the rate of change of the friction element input side speed sensed during the critical pressure retaining mode from the average rate of change of the friction element input side speed sensed during the precharge mode is calculated. The critical working pressure value is corrected in a direction to decrease the calculated difference.

REFERENCES:
patent: 3719096 (1973-03-01), Sprague et al.
patent: 3956947 (1976-05-01), Leising et al.
patent: 5086670 (1992-02-01), Nitz et al.
patent: 5345842 (1994-09-01), Kondo

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