8. Turboladernach Anspruch7,gekennzeichnetdurch Sensoren (11, 12) für die Erfassung der Ist-Stellung der Leitschaufeln (POS$_{VTGIST}$) und des Ladedrucks (P2$_{IST}$). 

## Claims 

1. Regulating method for a turbocharger (1) having a turbine (4) which has a variable turbine geometry (VTG)which isprovided withadjustable guide blades (5), characterized by  the following method steps: 

2. Regulating methodaccording toClaim1, character- ized in that  the method step d) with regard to regu- lating the guide blade position and regulating the charge pressure is carried out in a closed regulating loop. 

5 10 15 • ein Leitschaufelstellungs-Regler (10), der in Reihe zum Regler (9) geschaltet Ist und der die Leitschaufeln (5) der variablen Tur- binengeometrie (VTG), In Abhängi gkei t vomaktuellenBetrlebspunktdermittels des Turboladers (1) aufgeladener Verbr en- nungskraftmaschine (6), auf die für diesen Betriebspunkt maximal Schließposition der Leitschaufein schließtund derdie Stellung derLeitschau- feln (5) der variablen Turbinengeometrie (VTG) anhand der von der zweiten Bestim- mungseinrichtung (8) zugeführten Sollwer- te (POS$_{VTGSOLL}$) der Leitschaufelstellung, der vom Regler (9) zugeführten Ausgangs- signale und gegebenenfalls rückgeführter Ist-Werte (POS$_{VTGIST}$) der tatsächlic hen Leitschaufelstellung auf die ermittelte opti- male Position der Leitschaufeln (5) regelt. 

a) closing the guide blades (5) of the variable turbine geometry (VTG), as a function of the present operating point of the internal combus- tion engine which is supercharged by means of the turbocharger (1), to the maximum possible closed position of the guide blades (5) for said operating point, 

b)determining an optimum position of the guide blades (5) of the variable turbine geomet (VTG) at least predominantly on the basis of ro- tational speed values (n) and torque values (T) of the supercharged internal combustion en- gine, 

c) adjusting the guide blades (5) to the optimum position which is determined in this way, and 

d) regulating the charge pressure (P2) by ad- justing the position of the guide blades (5) in a closed regulating loop. 

3. Regulatingmethod according toClaim2, character- ized in that , after a drop in torque on account of a shift process, the VTG guide blades are placed into a maximum permissible closed position fora certain timeperiodofapproximatelya maximumofone sec- ond. 

Regulatingmethod according toClaim1, character- ized in that the method step a) is carried out as control. 

5. Regulatingmethod according toClaim1, character- ized in that  the method step a) is carried out for a duration of approximately a maximum of 500 ms. 

6. Regulating method according to one of Claims 2 to 5, characterized in that  the method steps c) and d) are carried out, with regard to the control of the charge pressure, in an open regulating loop and are carried out,withregardtotheregulating ofthe guide blade position, in a closed regulating loop. 

7. Turbocharger (1) for an internal combustion engine (6), in particular a spark-ignition or diesel engine, 

- having a compressor (2); 

- having a turbine (4) which is connected to the compressor (2) via a rotor shaft (3) and which has a variable turbine geometry VTG with ad- justable guide blades (5), 

characterized by  a regulating device (6)having the following components: 

•afirst determiningdevice(7) for determin- ing a nominal value (P2 $_{NOMINAL}$) for the charge pressure (P2) from rotational speed and torque data (n, T) of the internal com- bustion engine (6); 

• a second determining device (8), which is connected inparallelwiththe firstdetermin- ing device (7), for determining the optimum position of the guide blades (5) of the vari- able turbine geometry (VTG) at least pre- dominantly on the basis of rotational speed values (n) and torque values (T) of the su- percharged internalcombustion engine (6); 

• a regulator (9) for regulating the charge pressure (P2), which regulator (9) is con- nected in series with the first determining device (7) and regulates the charge pres- sure(P2)onthe basisofthe inputrotational speed and torque values (n,T)and the nom- inal value (P2$_{NOMINAL}$) of the charge pres- sure and, if appropriate, fed-back actual charge pressure values (P2$_{ACTUAL}$);and •a guide blade position regulator(10)which is connected in series with the regulator (9) and which closesthe guide blades (5)ofthe 

