Patent ID: 8428854
Filing Date: 2013-04-23
Classification: F02D,F02M,Y02T

Abstract:
1. An internal EGR control system for an internal combustion engine, for controlling internal EGR in which combustion gases are caused to remain in a cylinder, comprising: a variable valve operating mechanism that controls an internal EGR amount by changing valve-closing timing of exhaust valves of the engine; operating condition-detecting means for detecting operating conditions of the engine; target internal EGR amount-setting means for setting a target internal EGR amount serving as a target of the internal EGR amount according to the detected operating conditions of the engine; valve-closing timing-calculating means for calculating valve-closing timing of the exhaust valves according to the set target internal EGR amount; wall surface temperature parameter-acquiring means for acquiring a wall surface temperature parameter indicative of temperature of a wall surface of the cylinder; valve-closing timing-correcting means for correcting the calculated valve-closing timing of the exhaust valves according to the acquired wall surface temperature parameter; and control means for controlling the variable valve operating mechanism based on the corrected valve-closing timing of the exhaust valves.