Design And Implementation Of A Testing System For Vehicle CAN Networks

Along with expanding of vehicle CAN network'S application requirements．itsdevelopment technique become the key factor to the development ofvehicular networks．In orderto ensurethe correctness ofCANnetworkdevelopmentprocesss and efficiencyand reducethe cost,it'S necessarytouse someprofessionaltoolsfor a series ofrigoroustests to full inspection product quality．However,the development technologies nowalready form industrialization vehicle network testing tools have a monopoly by a fewdeveloped countries at present．But in this field of research and development ofdomestic level obviously lag behind advanced international standards,witch seriouslyrestrict the progress of China'S automobile network technology and the development oftheentire automotiveindustry．Therefore,itis ofvitalimportanceto develop avehicleCAN network testing system with independent intellectual property rights．According to the problem that there is no any domestic independently developedvehicleCANnetworktesting system．thethesisputsforward a kind of design scheme ofvehicle CAN network universal testing system．Morewhile,considering the algorithmuncertainty of CAN protocol resolution caused by the fact that there is no one openunifiedCAN application-layerprotocol,an aidedtestingtoolnamedCANdb editoristobe designed for users to def'me the application-layer protocol ofCAN network．And it aswell as afforts a support ofdeterminate algorithm ofCAN protocol resolution for thetesting systemintheway ofimporting a suffixalfilewithXML．Then,onthebasis ofthe project research resultes,a vehicle-mounted CAN network testing system isdeveloped．Andthemain contents ofthisthesisareasfollows:Firstly,thevehicleCANnetworkanditsdevelopment situationandfuturaltrendarereviewed,as well as the research status of vehicle network development tools at homeand abroad．Andthen,afurther study aboutthe CarCAN networkprotocolandtestingtechnology is done,focusing on the CAN network testing analysis method and thenetwork performance evaluation index．Secondly,the architectm'e of the testing system,which includes the auxiliary testtool and the test execution system,is given based on object-oriented idea,withanalyzing the class model,the state model and the interactive model．Thirdly,the vehicle CAN network testing system is realized on the base ofthe designing and realizingmetho~includingtheCANdb editerwiththemainfunctions ofCAN application-layer protocol design and file generation for CAN database,and theinterface framework ofthe testing system,as well as other four important functionalmodules,which arethedatamanagementmodule,communicationmodule,testanalysismodule andoutputdynamoicdisplaymodule．In orderto validatethefeasibility ofthetestingt system'Swhole designproposal,functional tests,bench experiments and the real Car tests are carried out．And testingincludes the functions of communications,network analysis,resolution protocol,off-line data analysis,ete．Through the analysis of the test cases alas results,theeffectivenesss of the vehicle-mounted CAN network testing system is verified and thefeasibilityofthedesignisproved．...