Transient Simulation for an ISG HEV Dual-Voltage 42V/14V Power-Net System

A dual-voltage 42 V/14 V Power-Net system of an ISG HEV is proposed, modeled and simulated in Simulink in this paper in order to analyze the change of the voltage of the dual-voltage power system, SOC of the battery and so on under some transient conditions as the engine starting, the transition from electric to generating mode for ISG motor and the sudden change of electrical loads when acceleration. The simulation results bear out that the ISG motor can meet the requirements for the engine starting and steady work during the sudden change of electrical loads; the 42 V lithium-ion battery has a normal charging and discharging process; the output voltage of DC/DC converter is steady.