Patent ID: 8751136

Claim:
Method for controlling combustion in a spark-ignition direct-injection internal combustion engine, comprising: monitoring an engine operating mode and an ambient parameter; determining a deviation of the ambient parameter relative to a nominal ambient parameter; determining a nominal desired engine operation parameter based on engine speed and load, wherein said nominal engine operation parameter comprises one of a nominal desired oxygen concentration and a nominal desired air/fuel ratio; determining an adjusted desired engine operation parameter based on said nominal desired engine operation parameter and said deviation of the ambient parameter, wherein said adjusted desired engine operation parameter comprises one of an adjusted desired oxygen concentration and an adjusted desired air/fuel ratio; and controlling the engine based on the engine operating mode and one of said nominal desired engine operation parameter and adjusted desired engine operation parameter, comprising one of: when the engine operating mode is stoichiometric, controlling external exhaust gas recirculation entering the engine based on the adjusted desired oxygen concentration when the monitored ambient parameter comprises altitude, and when the engine operating mode is stoichiometric, controlling external exhaust gas recirculation entering the engine based on the nominal desired oxygen concentration when the monitored ambient parameter comprises humidity.