Patent ID: 6672061
Filing Date: 2004-01-06
Classification: F02B,F02C,F02M,Y02T

Abstract:
An internal combustion engine comprising:an exhaust turbocharger including, an exhaust turbine disposed in an exhaust section, the exhaust turbine having a choke line, a turbine rotor and two flow passages for feeding exhaust gas to the turbine rotor, a compressor in an intake duct, and an exhaust-gas recirculation device having a recirculation line disposed between one of the flow passages and the intake duct; and wherein an asymmetry factor (FAsym) defining the size ratio of the flow passages of the exhaust turbine satisfies the formula FAsym&lE;(1/VH)0.15 wherein VH is the total displacement of the internal combustion engine, and wherein the asymmetry factor (FAsym) is defined asFAsym=&phgr;31,S/&phgr;32,S wherein &phgr;31,S and &phgr;32,S denote turbine throughput parameters in a region of the choke line of the exhaust turbine and are determined from the formula&phgr;31,S=m31,S{square root over (T31,S)}/p31,S &phgr;32,S=m32,S{square root over (T32,S)}/p32,S whereinm31,S, m32,S denote the mass flows of exhaust gas through the first and second flow passages, respectively, in the region of the choke line of the exhaust turbine, wherein T31,S, T32,S denote the exhaust-gas temperatures in the first and second flow passages, respectively, in the region of the choke line of the exhaust turbine, andwherein p31,S, p32,S denote the exhaust-gas pressures in the first and second flow passages, respectively, in the region of the choke line of the exhaust turbine.