Patent ID: 7975672
Filing Date: 2011-07-12
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method for controlling an internal combustion engine including a controllable throttle and controllable engine valves, the engine selectively operative in one of a plurality of combustion modes, comprising: monitoring engine operation including monitoring cylinder air volume and engine speed; determining a desired air flow; estimating a cylinder air charge based upon the monitored cylinder air volume, the engine speed, and an intake air partial pressure; estimating the intake air partial pressure based upon the estimated cylinder air charge; controlling the throttle and the engine valves based upon the intake air partial pressure and the cylinder air charge to achieve the desired air flow; transitioning from a spark-ignition combustion mode to an auto-ignition combustion mode; and determining a desired cylinder air volume during the transition based upon the desired air flow and the estimated intake air partial pressure.