Study on dynamic performance shaft of the ISG hybrid power system

In order to explore the dynamic performance of the electro-mechanical coupling shaft of Integrated starter and generator, the mathematical model of ISG hybrid shafting was established which includes electro-mechanical coupling shaft, sliding bearing and an engine cylinder. It was used to analyze the dynamic performance of the hybrid shafting. The torsional vibration frequency and crank throw stress distribution of the electro-mechanical coupling shaft were calculated, at the same time, the eccentricity and oil film pressure of the sliding bearing were calculated for different hybrid conditions in a working cycle. It was found the torsional vibration resonance of electro-mechanical coupling shaft will not happen in the working speed of engine, and the strength need to be redesigned for optimization and checked again after hybrid power reconstruction. The change of the hybrid condition will not distinctly affect the eccentricity and oil film pressure of the bearing of hybrid power system. The selection and design of the motor bearings and motor have been optimized by the oil film pressure and eccentricities at the motor bearings of electro-mechanical coupling shaft.