Multi-domain Unified Modeling And Simulation Of Hybrid Electric Vehicle

As one next generation Multi-domain Physical Systems(MPS)modeling language, Modelica unifies and generalizes previous modeling languages characteristics, it is well suited for efficiently modeling and simulating of complex tightly-coupled multi-domain physical systems for its supporting oriented-object modeling, multi-domain unified modeling, declarative modeling, and continuous-discrete hybrid modeling. It represents the new current of modern system modeling and simulating technology. Because it's huge development potential, Modelica obtained a rapid development, and appeared many simulation supporting software platform. It has been applied in the production practice, bringing the new turning point for the electric vehicle simulation technology leap breakthrough.This paper makes a modeling and simulation research on a Hybrid Electric Vehicle (HEV) under the multi-domain unification simulation platform SimulationX, which is based on the Modelica criterion.First, this paper makes a brief comparison and analysis of several Electric Vehicle simulation software universally used, and elaborates the Modelica language remarkable characteristics and the development situation. It shows the superiority of modeling and simulation of HEV based on the Modelica criterion. Through the comparison and analysis of the front simulation and the backward simulation of HEV, the entire vehicle simulation using the front simulation structure primarily had been determined.Second, an analysis and summarization of various parts modeling and simulation principle of the HEV is presented. Based on the power unit constitution, various parts (e.g. : engine, accumulator cell, electrical motor, gear box and so on) had been modeled under the SimulationX environment using the modulation design concept, and the simulation test had been carried on.Finally, these models have been put together with models from the Modelica standard library to a reference car and a parallel HEV, The reference car follows the EUDC driving cycle and the HEV follows the ECE+EUDC cycle. The simulation result indicated that, the modeling and simulation can reflect vehicles performance completely, all the parts models are correct and effective, the entire vehicle model can be used at the HEV energy management strategy and the power unit optimization research.