Patent ID: 10240563

Abstract:
A scavenged gas amount calculation device for an internal combustion engine, which is capable of accurately calculating a scavenged gas amount under conditions where scavenged gases are produced during a valve overlap time period, and an internal EGR amount calculation device for the engine, which is capable of calculating an internal EGR amount using the scavenged gas amount thus calculated. The internal EGR amount calculation device includes an ECU. The ECU calculates a basic blown-back gas amount using an average intake pressure, a maximum exhaust pressure, and a correction coefficient (step 6), calculates a scavenged gas amount using the average intake pressure, a minimum exhaust pressure, and a scavenge ratio (step 8), calculates a blown-back gas amount by correcting the basic blown-back gas amount by the scavenged gas amount (step 11), and calculates the internal EGR amount according to the blown-back gas amount (step 12).