Based on entry/exit pressures of compressor 2a detected by atmospheric/boost pressure sensors 13 and 14, pressure ratio of compressor is calculated. Based on mass flow rate and entry temperature of intake air 4 detected by intake air flow-rate/temperature ...

A method for diagnosing the fatigue failure of a turbocharger, comprising the steps of measuring the revolution speed of the turbocharger, computing an accumulated fatigue value (Ft) based on the measured revolution speed, and executing the fatigue failure...