Study On AUTOSAR-Based Modularization Of The Vehicle Controlling System For Pure Electric Vehicle

Energy crisis and environment problem bring the development of new energyvehicles to a crucial place, while providing a basis for the development of pureelectric vehicle(PEV) which served as the ultimate form of the new energy vehicles.The comprehensive performance of the PEV depends on the development of batteryand its management system technology, motor driven controlling technology,powertrain controlling technology and the combination of the three, ECUs of thevehicle control unit(VCU), the motor control unit(MCU) and the battery managementsystem(BMS) are no longer work independently but as a whole. In order to increasesystem reliability, promote ECU software transferability and reusability, acceleratedeveloping process, AUTOSAR organization established and got fully support fromsoftware tool suppliers, semiconductor suppliers and OEMS. Software tool supplierssuccessively release their product that support AUTOSAR-based development, butthey only cover part of the developing process, the tool itself is not so perfect and thework that needs to do to close the gap among the tools remains to study. MeanwhileAUTOSAR didn’t give any related guidance to some key step such as mapping thefunction block into individual ECUs in system configuration phase, although itregular the main workflow of developing ECU software. And now, it is mainly donemanually depends on engineer experiences.This paper focused on the issue involved in two aspects which was mentionedabove, aiming at exploring the developing approach of AUTOSAR-based ECUsoftware, fulfilling the design for the overall architecture of PEV controlling systemand solving the problem of distributing the ECU software function modular to theECUs. The concrete content is as follows:(1) Exploring the developing approach of AUTOSAR-based ECU software. Afterreading papers and standard files that related to AUTOSAR, we get a deep understanding of the key concept and the methodology of AUTOSAR. Then choose aset of AUTOSAR tool chain to explore the concrete realization of AUTOSAR. Thispart we focus on the responsibility of each tool and how they coordinate with eachother rather than the use of tool chain, we also discuss mechanisms to guaranteeAUTOSAR data consistency and its resource consumption condition.(2)Function module dividing. Based on the reading of plenty of literature and thestudy on the strategy that we already have, I learned the composition and relatedtheory of each part of the controlling system for PEV, managed the interaction amongthese modules. Then I reconstruct the controlling system for the PEV to make it moreclear and leave out related port, fulfill the design of upper layer architecture of thecontrolling system for the PEV, which afterwards serve as the basis for functiondistribution research.(3)Function module mapping evaluation approach establishment. Analysis howwill different ways of mapping influence on system performance. And define threerelative indicators to quantize this influence, thus establishing an approach to evaluatedifferent mapping plans. In addition, describe the mapping process in mathematicalway and realize the searching for the target plan with genetic algorithm, which is theemphasis of module research in this paper.(4)Simulation verification. In the end, we take PEV’s controlling systemarchitecture as an input, set low CAN load, uniform CPU load and ECU softwareextensibility as goal, respectively conduct single factor analysis and overall plananalysis, which finally produce two optimized reference mapping schemes and verifythe feasibility and advantage of the mapping optimizing technology applied in thisthesis.In this paper, after studying on the AUTOSAR-based ECU software developingtechnique and learning the controlling strategy that we already have, we fulfill thedesign of the up layer architecture for PEV’s controlling system and establish anevaluating approach for the function mapping, which optimize the ECU software function module mapping process to ECUS. This can be a supplement to AUTOSARresearch, which at the same time provides a reference to the modularized developmentof AUTOSAR-based vehicle controlling system for PEV.