Shift control system of automatic transmission

Details Shift control system of automatic transmission Shift control system of automatic transmission

1996-03-15

1997-11-04

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477 70, 477 80, 477143, 477154, F16H 6300

Patent

active

056833288

ABSTRACT:
A shift control system for an automatic is designed to prevent engine racing and clutch tie-up during a clutch-to-clutch shift (clutch switching shift) involving engagement/disengagement of first and second frictional engagement elements. The shift control system includes an engagement force controller for independently controlling both of the frictional engagement elements. A gear ratio calculator continuously calculates a gear ratio r of the transmission and a shift characteristic value calculator calculates a shift characteristic value .alpha. based on changes in the gear ratio between the start of the shift and completion of the shift. A control value calculator calculates a control value .beta., based on the shift characteristic value .alpha. calculated by the shift characteristic value calculator and a shift characteristic value .alpha.I on an ideal gear ratio curve. The control value .beta. is calculated so that the shift characteristic value .alpha. coincides with the shift characteristic value .alpha.I on the ideal gear ratio curve.

REFERENCES:
patent: 4557162 (1985-12-01), Fukunaga
patent: 4998451 (1991-03-01), Sano
patent: 5075858 (1991-12-01), Narita
patent: 5086665 (1992-02-01), Milunas et al.
patent: 5168449 (1992-12-01), Benford
patent: 5514051 (1996-05-01), Heid et al.
patent: 5559694 (1996-09-01), Kraemer et al.

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