Method for controlling the level of oxygen in the intake manifold of an internal combustion engine equipped with a low pressure EGR system

摘要

A method is provided for controlling the level of oxygen concentration in the intake manifold of an internal combustion engine system. The engine having an intake manifold and an exhaust manifold and corresponding intake and exhaust lines, the intake line having a leading point for mixing of fresh air, first and second EGR routes, a charge air cooler located in the intake line upstream the intake manifold and downstream the second EGR route, a turbocharger having a compressor located in the intake line and a turbine located in the exhaust line, the exhaust line having a diesel oxidation catalyst and an antiparticulate filter. The system has a regulator for regulating the flow rate of exhaust gas. The regulator including, but not limited to a low pressure EGR valve associated to the second EGR route. The method including, but not limited to at least a phase of determination of the oxygen concentration set-point at any point in the portion of the intake line between said leading point up to the intake manifold and a phase of maintaining the desired oxygen concentration set-point in any point of said portion.