Hubload — causes, effects and mitigation measures on a P0 electrical machine in a typical mild hybrid electric vehicle powertrain

Abstract

Hybrid Electric Vehicles based on P0 architecture have gained popularity in recent years due to the FE (Fuel Efficiency) improvement and emission reduction benefit it offers, at lesser cost and integration effort compared to other hybrid architectures. Mechanical stress on the P0 electrical machine due to the higher operating loads and dynamics of FEAD (Front End Accessory Drive) system is a major challenge involved in the integration of P0 electrical machine to the powertrain. This paper discusses causes and effects of excessive hub load on P0 electrical machine and measures identified to mitigate the excessive hub load and torsional torque are presented. This paper also describes the measurement setup, experiment and analysis methodology followed for hub load and torsional torque measurement. The measurement involves different vehicle maneuvers in different temperature conditions. Details on how the experiment is derived is also mentioned in this paper.