Method of operating an i.c. engine turbocharger with mathematically determined correction of basic boost pressure

摘要

A method for operating a turbo charger 12 for a combustion engine comprises (a) providing a set of values of a basic boost pressure (which is the minimum pressure required for opening a turbine waste gate 28) at a standard temperature T0and at a standard pressure p0; (b) measuring ambient air temperature T; (c) measuring ambient air pressure p; (d) calculating the density of ambient air based on the measured ambient air temperature T and ambient air pressure p; (e) transforming at least one point of the provided set of values of the basic boost pressure at standard conditions into at least one point of an estimated set of values of the basic boost pressure at ambient conditions by a correction factor based on the calculated density ; and (f) using the at least one corrected value of the basic boost pressure for controlling the turbocharger 12. The mathematical determination of the basic boost pressure correction tables obviates the use of time-consuming calibrations.