Methodology to compensate for the effect of humidity and sea level on HCCI combustion

摘要

A method of controlling combustion in a spark-ignition direct injection internal combustion engine, comprising: monitoring engine operating mode, ambient humidity, and ambient pressure; an oxygen mass in a cylinder (15) to maintain a desired combustion phasing based on engine speed; controlling an engine load, comprising: determining a nominal setting of an externally recirculated exhaust gas to maintain a desired mass of oxygen in a cylinder (15) at a nominal humidity and a nominal pressure; a nominal setting for an air-fuel ratio in a cylinder (15) for maintaining the desired oxygen mass in a cylinder (15) at the nominal humidity and the nominal pressure; when the engine operating mode is stoichiometric and the ambient pressure deviates from the nominal pressure, the externally recirculated exhaust gas is referred to I am controlled the nominal setting for the externally recirculated exhaust gas; and then, when the engine operating mode is overstoichiometric and the ambient pressure deviates from the nominal pressure and / or the ambient humidity deviates from the nominal humidity, the air-fuel ratio in a cylinder (15) relative to the nominal air-fuel ratio setting in a cylinder (15 ) is controlled.