Patent ID: 11959429
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A method for estimating the efficiency loss of a turbocharger for an engine, said method comprising the steps of:—
monitoring a plurality of operating parameters;
determining a compressor exit temperature according to a first calibration map based on the plurality of operating parameters;
determining an estimate of instantaneous turbocharger efficiency loss according to a second calibration map based on the compressor exit temperature;
determining a NOx concentration in engine exhaust gas at the compressor outlet temperature according to a NOx concentration map for the estimate of instantaneous turbocharger efficiency loss;
using the determined instantaneous turbocharger efficiency loss to determine an estimate of cumulative turbocharger efficiency loss during engine service;
comparing the estimate of cumulative turbocharger efficiency loss with a first predetermined efficiency loss threshold;
generating a first signal if the first predetermined efficiency loss threshold is exceeded.