Low-pressure EGR system with turbo bypass

#This application is a U.S. National Phase Application under 35 U.S.C. 371 of International Application No. PCT/EP2019/054933, filed on Feb. 28, 2019, which claims the benefit of German Patent Application No. 10 2018 104 599.9, filed on Feb. 28, 2018. The entire disclosures of the above applications are incorporated herein by reference.

#The disclosure relates to an exhaust gas conduction system for a gasoline engine, comprising an exhaust gas line which can be connected to an exhaust manifold of the gasoline engine, an intake line which can be connected to an intake manifold of the gasoline engine, and a charge air compressor which is arranged in the intake line, and a turbine which is arranged in the exhaust gas line, wherein the exhaust gas line has at least one bypass line with a bypass throttle valve, said line branching off from the exhaust gas line upstream of the turbine and branching back into the exhaust gas line at an opening downstream of the turbine, and wherein at least one exhaust gas recirculation line with an EGR throttle valve is provided, said line opening into the intake line, wherein the exhaust gas recirculation line branches off at a branch on the bypass line, wherein the bypass throttle valve is arranged upstream of the branch of the exhaust gas recirculation line, and wherein an exhaust gas valve is provided in the exhaust gas line upstream of the opening of the bypass line.

#The disclosure further relates to a method for operating a gasoline engine, comprising such an exhaust gas conduction system.

#The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

#Further advantages and details of the disclosure are explained in the claims and in the description, and portrayed in the figures, in which:

#FIG. 1 shows a principle sketch of an exhaust gas conduction system with a bypass line with integrated LP-EGR;

#Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.

#Example embodiments will now be described more fully with reference to the accompanying drawings.

#In all principle sketches according to the exemplary embodiments in FIGS. 1 to 3, an exhaust gas conduction system 1 (EGR system) is shown which is integrated into the exhaust gas and charge air system of a gasoline engine 2 with an exhaust manifold 2.1 and an intake manifold 2.2 and with an exhaust gas turbine 3 and a charge air compressor 4. The exhaust gas and charge air system has an exhaust gas line 2.3 that is connected to the exhaust manifold 2.1 of the gasoline engine 2, into which the turbine 3 is integrated. At the end of the exhaust gas line 2.3, the exhaust gas 7 leaves the exhaust gas system 1 and flows into the additional exhaust gas path not shown. Additionally, an intake line 2.4 is provided that is connected to the intake manifold 2.2 of the gasoline engine 2, into which the compressor 4 is integrated. The intake line 2.4 is supplied with fresh air 8 via an air feed system, not shown. Additionally, a bypass line 1.1 is provided that branches off from the exhaust gas line 2.3 and which branches back downstream of the turbine 3 in the exhaust gas line 2.3. The bypass line 1.1 has a bypass throttle valve 1.4 for regulating the gas mass flow.