Design And Application Of Hybrid Powertrain Controller Integrated Development Platform

Hybrid Electric Vehicle referred as HEV combines traditional internal combustionengine and electric drive systems. HEV has two kinds of advantages compared withtraditional vehicle and electrical vehicle. The first one is that fuel consumption andemission performance of HEV are better than that of the internal combustion enginepowered vehicles. The second one is that HEV’s mileage is far more than that of pureelectric vehicles. Thus HEV is one of the directions of development of today’sautomotive industry. Hybrid powertrain controller is one of the key components of HEVand full-featured integrated development platform of controller can effectively improvethe efficiency and reduce costs. The background of this paper comes from a projectbetween Foton Bus Company and Tsinghua University. An integrated developmentplatform of hybrid powertrain controller was designed and Vehicle Control Unit (VCU)of the hybrid bus was developed on this platformOn the basis of the analysis of hybrid powertrain structure, the control strategy wasanalyzed and divided into several function modules, which include identification ofdriver’s intention, power management and transmission gear selection strategies,coordinated control of gear shift, fault diagnosis and so on. The overall design of thehybrid powertrain controller development platform was conducted based on thecommon “V” development model. It includes simulation system, rapid controlprototyping (RCP) system, Hardware in the loop (HIL) system and test bench system.This platform realizes offline simulation, RCP, HIL, automatic code generation, benchtest, and so forth.The hybrid powertrain components and controller model were developed inMATLAB/Simulink environment. The component models were validated throughcomparison with bench test data. Using these models, the simulation software of hybridpowertrain was designed and the control strategies were tested through offlinesimulation. Two RCP systems were developed in this paper. One was based onVeristand and PXI hardware, the other was based on Matlab/RTW and MCS12XEP100microprocessor of Freescale. The controller model can be transferred to C code,compiled and downloaded into the RCP with automation code generation function ofMatlab/RTW. The functions of these two RCP systems were validated on test bench and HIL system. The results showed that both of them could meet the requirements of thecontroller development platform.Based on Virtual Instruments technology and embedded PC hardware, a HILsystem was developed and validated through bench test. HIL simulation tests werecarried out on this system, including the vehicle economy and emissions performancetests.The VCU of Foton hybrid city bus was successfully developed on this integrateddevelopment platform and this platform could provide a reference for hybrid powertraincontroller development.