METHOD AND SYSTEM FOR ENGINE AIR CONTROL

摘要

Methods and systems are provided for reducing idling torque imbalances between cylinders by actuating a common camshaft to which the cylinders are coupled. The camshaft may be adjusted within camshaft limits during each combustion event of each cylinder. In this way, idling NVH issues may be addressed.

主权项

1. A method for adjusting valve timing of an engine, comprising:
compressing intake air with a compression device, the amount of compression provided to one or more cylinders of the engine varied by a controller; operating intake valves of two or more cylinders via a camshaft; and adjusting, with the controller, the camshaft based on a camshaft limit during engine idle conditions for each combustion event of the two or more cylinders via a hydraulically operated actuator.