Patent ID: 6401457
Filing Date: 2002-06-11
Classification: F02B,F02D,F02M,Y02T

Abstract:
A system for estimating turbocharger compressor outlet temperature, comprising:a turbocharger having a compressor defining a compressor inlet and a compressor outlet fluidly coupled to an intake manifold of an internal combustion engine; a turbocharger speed sensor producing a turbocharger speed signal indicative of turbocharger rotational speed; means for determining air pressure within said compressor outlet and producing a first pressure signal corresponding thereto; a compressor inlet pressure sensor sensing air pressure within said compressor inlet and producing a second pressure signal corresponding thereto; means for determining a mass flow of fresh air entering said compressor inlet and producing a mass air flow signal corresponding thereto; and a control circuit computing a pressure ratio as a ratio of said first and second pressure signals, said control circuit estimating a temperature of said compressor outlet as a function of any two of said turbocharger speed signal, said mass air flow signal and said pressure ratio.