Software Design And Research Of Aftertreatment Integrated Control System For Diesel Vehicle Based On AUTOSAR Architecture

At present,as emission regulations become stricter,the requirements for diesel engine PM and NO_X emissions are very strict.A single aftertreatment system can no longer meet the regulations,and a variety of aftertreatment technologies must be integrated.In addition,for the development of electronic control products,the level of system hardware development is relatively mature.The focus and difficulty of development lies in software.Mature control software is a key factor for achieving control functions and improving vehicle performance.Due to the large differences in the development platform of automotive electronic control software used by domestic and foreign automakers and component suppliers,in order to promote the porting and reuse of electronic control software codes in order to save costs,it is jointly recommended to adopt a unified automotive software system architecture.The key to the development of diesel engine aftertreatment control system is also its software,which requires in-depth research on the aftertreatment system and its integrated electronic control technology.Based on the DOC+DPF+SCR integrated aftertreatment system that meets the national sixth emissions regulations of heavy-duty diesel vehicles,this paper refers to the AUTOSAR architecture for the design and research of the national?-oriented heavy-duty diesel engine aftertreatment integrated electronic control system software.The main tasks completed are as follows:1.Integrated aftertreatment control system is constructed and hardware is designed.Based on the research and application of domestic and foreign aftertreatment systems,the types of aftertreatment system required in this paper are selected;on the AdBlue metering pump independently designed by the research group,an aftertreatment integrated control system that meets the national six regulations was built,integrating the functions of the diesel engine DPF fuel injection electronic control system and the SCR urea injection electronic control system.Based on the analysis of the functional requirements of the aftertreatment integrated control system,the modular design of the hardware circuit was completed.Finally,the software development requirements of the aftertreatment integrated electronic control system were formulated according to the hardware requirements.2.The bottom driver module of the controller is customized.Design the target environment of the automatic code generation system for the target MCU,and design the bottom driver module of the aftertreatment control system software with Simulink.First write the S function of the module;then create a TLC(Target Language Compiler)file for each driver module for the function of the driver function to customize the code generation process and apply the user's configuration information to the underlying driver register.Complete the customized design of the bottom driver module and automatically call the compiler,and finally test the bottom driver module.3.The strategy is researched and application layer module software is designed.Refer to the AUTOSAR architecture to divide the control system software layer into different functional modules and software layers based on hierarchical and modular design ideas.Using MATLAB/Simulink/Stateflow to design the software application layer and its functional modules in detail,and using the code generation tool to automatically generate the application layer software.The application layer software is the specific implementation of the upper layer strategy algorithm.The aftertreatment integrated control system software application layer mainly includes the SCR control algorithm and the DPF control algorithm;the SCR algorithm includes system state control,urea demand calculation and OBD fault diagnosis;DPF control algorithm mainly includes carbon load estimation and regeneration process control.In view of the shortcomings faced by traditional software development,on the basis of an in-depth study of system theoretical model algorithms,this topic uses a V-based software development method to design a strategy,model construction and verification to the final automatic code program generation,etc.Research.4.System function test and bench test verification are carried out.The application layer code and the bottom layer code generated in the above test are integrated in the CodeWarrior IDE,and the integrated code is downloaded to the development board for subsequent relevant tests and verification.Based on the experimental system platform built by the research group,the integrated electronic control software developed was applied to the semi-physical system function test and bench test,and the related experiments were verified.The semi-physical system function experiment shows that the developed system control strategy is feasible and meets the functional requirements;the engine bench test shows that the developed system can make emissions of a certain diesel engine meet Euro VI or China VI emission requirements.