Engine torque management for clutch-to-clutch upshifting of...

Details Engine torque management for clutch-to-clutch upshifting of... Engine torque management for clutch-to-clutch upshifting of...

F - Mech Eng,Light,Heat,Weapons

16

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F16H 59/14 (2006.01) F16H 61/06 (2006.01) F16H 59/38 (2006.01) F16H 61/04 (2006.01) F16H 61/684 (2006.01)

Patent

CA 2066338

G-8086 C-4316 ENGINE TORQUE MANAGEMENT FOR CLUTCH-TO-CLUTCH UPSHIFTING OF AN AUTOMATIC SHIFT TRANSMISSION Abstract of the Disclosure An improved powertrain control which recognizes the occurrence of engine speed flare during low torque upshifting, and effectively converts the shift to a power-off upshift via an override of the normal engine torque management controls. The engine spark timing is retarded by a predetermined amount during every power-on upshift for the reasons described above. However, when the occurrence of engine flare is detected, the control increases the spark retard to a maximum value, substantially eliminating the transmission input torque. As the on-coming element smoothly applies and decelerates the input, the flare condition terminates, and the spark timing is returned to the predetermined amount for completion of the shift.

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