Engine torque management during coast downshifting of an...

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

F - Mech Eng,Light,Heat,Weapons

16

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F16H 59/14 (2006.01) F16H 61/06 (2006.01) F16H 59/18 (2006.01) F16H 59/24 (2006.01) F16H 59/42 (2006.01) F16H 61/00 (2006.01) F16H 61/04 (2006.01)

Patent

CA 2119393

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.

Commande améliorée de groupe propulseur avec détection de couple moteur positif causé par une accélération provoquée par l'opérateur durant les phases débrayé-synchro-débrayé, rétrogradation, prévenant ou empêchant les montées en vitesse par l'intervention des commandes de gestion du couple moteur. Le calage de l'allumage ne réagit normalement pas aux conditions de débrayé-synchro-débrayé-rétrogradation; or, lorsqu'une accélération entraîne un couple moteur positif excessif, susceptible de causer, ou causant effectivement, une montée en vitesse du moteur, cette montée est détectée, le retard à l'allumage est contrôlé à une valeur prédéterminée, contrôlant ainsi le couple à l'arbre primaire de transmission et permettant une application en douceur de l'élément suivant, en vue du passage de vitesse.

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