Patent ID: 7992388
Filing Date: 2011-08-09
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method of estimating output temperature of an output of a pair of serially coupled compressors of a two-stage turbocharger system, said two-stage turbocharger system including: a mass flow sensor; a temperature sensor at an input of the pair of compressors; and an engine control unit, the method comprising, obtaining a functional relationship relating (1) temperature ratio across the pair of compressors as a function of mass flow through said pair of compressors; and (2) pressure drop across the pair of the compressors; calculating the pressure ratio equal to the pressure at the-input of the pair of compressors to the pressure at the output of the pair of compressors; using the functional relationship and an output of a mass flow measured by the flow sensor and the calculated pressure ratio to determine the temperature ratio across the pair of the compressors; and estimating the output temperature of the pair of the compressors by using the control unit to multiply the determined temperature ratio across the pair of the compressors by a temperature measured by the temperature sensor.