Engine torque management during coast downshifting of an automat

Details Engine torque management during coast downshifting of an automat Engine torque management during coast downshifting of an automat

1993-06-16

1995-08-29

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Engine ignition control for transmission change

477102, 477109, F16H 5950

Patent

active

054455766

ABSTRACT:
An improved powertrain control which recognizes the occurrence of positive engine torque caused by accelerator walk-in by the operator during coast-sync-coast downshift, and effectively prevents or arrests speed flare via engine torque management controls. The engine spark timing is normally not responsive to coast-sync-coast downshift conditions, however, when the occurrence of accelerator walk-in results in excessive positive engine torque likely to cause, or actually causing, engine speed flare is detected, spark retard is controlled to a predetermined value, thereby controlling the transmission input torque and allowing smooth application of the on-coming element for completion of the shift.

REFERENCES:
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5129286 (1992-07-01), Nitz et al.

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