Patent ID: 8290686
Filing Date: 2012-10-16
Classification: F01L,F02B,F02D

Abstract:
1. Method for operating a spark-ignition direct-injection internal combustion engine including a controllable valvetrain having intake and exhaust valves and configured to operate in a plurality of combustion modes, the method comprising: operating the engine in a first combustion mode; determining an operator torque request; initiating a transition from operating the engine in the first combustion mode to operating the engine in a second combustion mode, the transition including operating the engine in an intermediate combustion mode; determining a preferred fuel mass associated with operating the engine in the second combustion mode to achieve the operator torque request; transitioning from operating the engine in the first combustion mode to operating the engine in the intermediate combustion mode and adjusting an injected fuel mass to correspond to the preferred fuel mass when a permissible fuel mass range for the intermediate combustion mode coincides with the preferred fuel mass; and transitioning from operating the engine in the intermediate combustion mode to operating the engine in the second combustion mode and adjusting the injected fuel mass to correspond to the preferred fuel mass when a permissible fuel mass range for the second combustion mode coincides with the preferred fuel mass.