Patent ID: 6481416
Filing Date: 2002-11-19
Classification: F02P,Y02T

Abstract:
Method for correction of the spark advance for an internal combustion engine (1) with a continuous phase transformer at the intake and/or exhaust; for each cylinder (2), the method consisting of calculating a theoretical value (AAth) of the optimum spark advance according to the drive point, calculating a first correction value (AAC1), which depends on the mass (% EGR) of burnt gas trapped in the cylinder (2) at the end of the intake phase, and calculating the actual value (AAeff) of the spark advance, by adding the said first correction value (AAC1) algebraically to the theoretical value (AAth) of the spark advance; the method being characterised in that the first correction value (AAC1) is calculated according to the mass (% EGR) of burnt gas trapped in the cylinder (2) at the end of the intake phase; and the mass (% EGR) of burnt gas trapped in the cylinder (2) at the end of the intake phase being estimated according to the speed of rotation (RPM), according to the timing value (VVT) at the intake and/or exhaust, and according to the pressure difference (&Dgr;P) between the exhaust manifold (5) and the intake manifold (3).