Method for estimating pressure prevailing in combustion chamber of spark-ignition internal combustion engine in car, involves estimating change of combustion pressure ranging between pressures at end of compression and combustion phases

摘要

The method involves estimating change of pressure and temperature in a combustion chamber (6) at an end of a compression phase of a driving cycle. Pressure and temperature at an end of a combustion phase of the driving cycle are estimated. A change of combustion pressure ranging between the estimated pressure at the end of the compression phase and the estimated pressure at the end of the combustion phase, is estimated. A change of pressure and temperature in the combustion chamber at a relaxation phase of the driving cycle is estimated. An independent claim is also included for a vehicle.