Influence of Temperature and Injection Pressure of Lubrication in the Vibration of an Automotive Turbocharger

The strategy of supercharging using turbochargers coupled to internal combustion engines (ICE) is becoming ever more used in the transportation industry. The power density increase, fuel consumption reduction and downsizing are some of its main advantages. To ensure the system operation durability, some factors must be considered in order to avoid deterioration and early turbocharger failure, mainly in the thrust bearing. Therefore, this work aims to correlate injection temperatures and lubricating oil pressures of an automotive turbocharger with the amplitude of component vibration, presenting experimental results of axial synchronous response obtained through tests performed in a standard turbochargers test bench. In these experiments, the turbocharger is submitted to a run-up speed profile. It is possible to perform a quantitative analysis with the obtained data, that correlates the aforementioned parameters and shows the impact that each change has with the vibrational response amplitudes.