VARIABLE VALVE ACTUATION CONTROL SYSTEMS AND METHODS

A variable valve actuation (VVA) system comprises a spark control module and a phaser control module. The spark control module maintains a spark timing of a cylinder at a maximum braking torque (MBT) spark timing during engine idling. The phaser control module, during the engine idling, adjusts an i...

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Bibliographic Details
Main Authors MARRIOTT CRAIG D, WILES MATTHEW A
Format Patent
LanguageEnglish
Published 31.03.2011
Subjects
BLASTING
COMBUSTION ENGINES
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
ENGINE PLANTS IN GENERAL
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
WEAPONS
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Summary:A variable valve actuation (VVA) system comprises a spark control module and a phaser control module. The spark control module maintains a spark timing of a cylinder at a maximum braking torque (MBT) spark timing during engine idling. The phaser control module, during the engine idling, adjusts an intake valve timing of the cylinder away from a predetermined intake valve timing. The predetermined intake valve timing corresponds to a maximum air per cylinder (APC) for the cylinder at a current engine speed. The adjustment of the intake valve timing produces an APC that is less than the maximum APC.
Bibliography:Application Number: US20090570364