Shift control method for automatic transmission

Details Shift control method for automatic transmission Shift control method for automatic transmission

1996-04-03

1998-01-06

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 477155, F16H 6106

Patent

active

057048746

ABSTRACT:
A shift control method for executing a shift-up control from an off-going range to an on-coming range comprises an off-going-range releasing stage, an off-going-range controlling stage, and an on-coming-range invalid-stroke-clearing stage. In the off-going-range releasing stage, a pressure command signal is generated to quickly lower the engagement-actuation pressure of the off-going engaging element. In the off-going-range controlling stage, a pressure command signal is generated to control the engagement-actuation pressure of the off-going engaging element in such a way that the off-going engaging element is kept slipping within a predetermined range of input/output rotational speed ratio (=output rotational speed/input rotational speed). In the on-coming-range invalid-stroke-clearing stage, a pressure command signal is generated to set the engagement-actuation pressure of the on-coming engaging element to a predetermined high-pressure which is necessary for the on-coming engaging element to clear its invalid stroke. This shift-up control initiates the on-coming-range invalid-stroke-clearing stage in response to a shift-up command and proceeds from the off-going-range releasing stage to the off-going-range controlling stage when the input/output speed ratio of the off-going engaging element reaches a first predetermined value in the off-going-range releasing stage. Then, pressure command signals are generated sequentially first to engage the on-coming engaging element in a predetermined engaging pattern and then to completely release the off-going engaging element.

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