Patent ID: 6711489
Filing Date: 2004-03-23
Classification: F02D,G05B,Y02T

Abstract:
A method for estimating residual gas in each cylinder of an internal combustion engine, the method comprising:estimating total mass flow entering into cylinders of the engine by processing intake pressure measurements; estimating total mass flow exiting from cylinders of the engine by processing exhaust pressure measurements; determining mass flow into each cylinder by integrating the estimated total mass flow entering into the cylinders based on starting and ending times for induction strokes of each cylinder; determining mass flow exiting from each cylinder by integrating the estimated total mass flow exiting from the cylinders based on starting and ending times for exhaust strokes of each cylinder; and determining residual gas in each one of the cylinders by subtracting from the integrally determined mass flow entering into one of the cylinders the integrally determined mass flow exiting from the one of the cylinders.