Method and system for operating a direct injection spark internal combustion engine having variable compression ratio modes

摘要

A method of operating a variable compression, direct injection spark ignited internal combustion engine includes the steps of determining a demanded torque output of the engine, determining a current combustion mode and a current compression ratio mode of the engine; transitioning operation of the engine from the current combustion mode to a new combustion mode to produce the demanded torque output, and transitioning operation of the engine from the current compression ratio mode to a new compression ratio mode so as to minimize torque disturbances during the transitioning of engine operation from the current combustion mode to the new combustion mode.