Influence of Cylinder Pressure Curve on Total Friction in Internal Combustion Engines - Techniques and Methods for Measurement and Simulation

The article presents a collaborative research project between the University of Stuttgart and the University of Kassel, focusing on the influence of cylinder pressure curves on total friction in internal combustion engines. The study systematically investigates five operating points, varying ignition timing and exhaust gas recirculation rates to measure and simulate friction accurately. Experimental measurements include temperature distribution and oil filling ratio, while simulation models are validated through extensive testing. The results highlight the significant impact of cylinder pressure curves on friction, particularly at low speeds and high loads, and demonstrate the importance of considering thermal deformation and real clearances in simulations. The article concludes with a summary of the findings and their implications for improving engine efficiency.