ENGINE INTERNAL EGR AMOUNT ESTIMATING METHOD, ADJUSTABLE VALVE CONTROLLING METHOD USING THE SAME, CYLINDER INTAKE AIR AMOUNT CALCULATING METHOD, AND IGNITION TIMING CONTROLLING METHOD

摘要

PROBLEM TO BE SOLVED: To estimate internal EGR amount with high accuracy. SOLUTION: A basic value of internal EGR amount without overlapping is calculated (S2), and when overlapping, increasing correction amounts (S5, S6, S7) due to overlapping calculated by considering overlap time, a center crank position thereof, and intake air pressure are added to calculate internal EGR amount (S8). A target closing timing of an intake air valve is calculated to a target air amount correcting valve obtained by adding the internal EGR amount to a calculated target air amount (S1).