Patent ID: 7735477
Filing Date: 2010-06-15
Classification: F01L,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, by continuously changing an exhaust cam phase as a phase of an exhaust cam for driving an exhaust valve with respect to a crankshaft, using a variable exhaust cam phase mechanism, and continuously changing a lift of the exhaust valve, using a variable exhaust valve lift mechanism, comprising: target internal EGR amount-setting means for setting a target internal EGR amount serving as a target of the internal EGR amount; target cam phase-setting means for setting a target cam phase serving as a target of the exhaust cam phase, according to the set target internal EGR amount; phase control means for controlling the variable exhaust cam phase mechanism such that the exhaust cam phase becomes equal to the target cam phase; actual cam phase-detecting means for detecting an actual exhaust cam phase as an actual cam phase; valve-closing timing-calculating means for calculating valve-closing timing of the exhaust valve according to the target internal EGR amount; target lift-setting means for setting a target lift of the exhaust valve according to the detected actual cam phase of the exhaust valve and the calculated valve-closing timing of the exhaust valve; and lift control means for controlling the variable exhaust valve lift mechanism such that the lift of the exhaust valve becomes equal to the target lift.