Patent ID: 6256991
Filing Date: 2001-07-10
Classification: F02B,F02D,F05B,Y02T

Abstract:
An internal combustion engine/turbocharger system, comprising:an internal combustion engine having at least one variable-volume combustion chamber, an engine displacement of the internal combustion engine being determined by a sum of the differences between the smallest and the largest volume of combustion chambers of the engine;a turbocharger system operatively coupled with the internal combustion engine, said turbocharger system having at least one turbine including a turbine rotor, said turbine being arranged in an exhaust path of the engine and having a flow duct opening via an annular nozzle region onto the turbine rotor;a guide vane system arranged in said region, said guide vane system comprising a variable guide vane array having adjustable guide vanes, said variable guide vane array allowing free cross sections of flow of different magnitude, said guide vane array further determining, in a braking mode, a respective narrowest cross section of flow in the exhaust path to the turbine and adjusting it as a function of engine operating parameters using the guide vane array as a restrictor;wherein, based on braking operation at a maximum braking power of the engine, a free cross section of flow A.sub.T exposed in the exhaust path to the turbine at the maximum braking power, an inlet diameter D.sub.T of the turbine rotor, and a displacement V.sub.H of the engine have the following relationship: ##EQU4##in which denotes a turbo-braking factor and is less than 0.005 (5%).