Patent ID: 8955317
Filing Date: 2015-02-17
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method for operating a supercharged internal combustion engine of a motor vehicle, comprising the steps of: while operating the supercharged internal combustion engine in lean burn in a predetermined range of low engine load and/or speed, operating an internal exhaust gas recirculation via at least one of controlling at least one intake valve ( with increasing engine load and/or speed of the supercharged internal combustion engine within the predetermined range of low engine load and/or speed, increasing an exhaust gas recirculation rate of the external exhaust gas recirculation and, at the same time, decreasing an exhaust gas recirculation rate of the internal exhaust gas recirculation, while reducing an overall exhaust gas recirculation rate wherein the overall exhaust gas recirculation rate is a sum of the exhaust gas recirculation rates of the external exhaust gas recirculation and the internal exhaust gas recirculation; and upon reaching an engine load and/or speed that exceeds the predetermined range of low engine load and/or speed, operating the supercharged internal combustion engine with a homogeneous mixture of air and fuel without exhaust gas recirculation.