Patent ID: 7340896
Filing Date: 2008-03-11
Classification: F01D,F02B,F02C,F05D,Y02T

Abstract:
1. A method for efficiently regulating turbine power of a turbo in an internal combustion engine, wherein the internal combustion engine comprises an exhaust-driven turbine including guide elements for guiding an exhaust gas flow to a turbine wheel, the guide elements being adjustable to a first position wherein the guide elements are in the fully closed position (A) and a second position (C) wherein the guide elements are in the fully opened position, through a range of positions defined by and between the first position (A) and the second position (C) for the purpose of regulating the quantity of exhaust gases through the turbine, the method comprising: when there is a medium to large exhaust gas flow: defining a range wherein the guide elements are adjustable into a third position (D) wherein the guide elements are between the first and second positions (A,C), and a fourth position (E) wherein the guide elements are between the third and second position (D,C); adjusting the guide elements into a fifth guide element position (F) which lies within a subrange, wherein the subrange comprises the guide elements being between the third and fourth positions (D,E) and includes at least one guide element position having a higher turbine efficiency than the guide element positions between the first and third positions (A,D) and between the fourth and second positions (E,C) wherein the adjustment produces superfluous exhaust gases; bypassing the superfluous exhaust gases past the turbine to enable a desired turbine power to be obtained.