Research On High Pressure Common Rail ECU Control Model Design And Test Based On ISO 26262

With the rapid development of automotive electronics technology,the innovation in automobile technology grows dramatically,and automotive electrification,connection and intelligence have become the mainstream.However,the applications of electronic control units bring many undesired potential safety hazards.Automotive recalls caused by ECU software defects have been repeated,which is a serious threat to the safety of people's life and property.Therefore,ISO introduces ISO 26262 functional safety standard to norm automotive electrical and electronic products.Aimming at the problem of immature application of ISO 26262 standard in practical engineering,the author deeply learned and understood the functional safety standard,and applied it to the model-based development of high pressure common rail ECU.The ultimate goal is to improve the safety of high pressure common rail ECU and set up a set of model-based design method and idea in accordance with ISO 26262.This thesis firstly introduces the main contents of ISO 26262,and analyzes the key concepts such as the safety lifecycle,functional safety concept,Automotive Safety Integrity Level(ASIL),and the coverage.The requirements of ISO 26262 for model-based design were analyzed,and a model-based design method was summed up in accordance with ISO 26262.Then the design and implementation of the high pressure common rail ECU control model according to ISO 26262 were analyzed in detail.The unexpected acceleration of the vehicles with high pressure common rail electronic control system is a typical hazardous event,so it's taken as an example in this thesis.Through the hazard analysis and risk assessment,the security objective of preventing unintended acceleration and ASIL C level were obtained,and the corresponding functional security requirements were further obtained,and the software safety requirements were refined.Then the control model architecture of high pressure common rail ECU was designed.Finally,the related modules of key functions were designed,implemented and verified.Aiming at simplifying the development process,the HEX automatic generation tool was developed to enable HEX file and A2L file to be generated automatically with one key.Therefore,the tool improves development efficiency and cuts down costs.The method of model test and vefification is another key task in model-based development.The thesis introduces how to complete the test and verification of high pressure common rail ECU software in acccordance with ISO 26262.In the phase of software unit testing,the requirements-based test of accelerated pedal verification module,the interface test of rail pressure sensor module and the software-in-the-loop test of torque limit module were made.In the phase of software integration testing,through fault injection test in the mode of hardware-in-the-loop,data interaction among different functional safety-related software components was tested on the target hardware,and the interface correctness among software components was verified.At last,through the verification of the software safety requirements of high pressure common rail ECU in the test bench,the functional safety was proved in the actual environment,and the scientificalness of the model design and test methods in this thesis was vefified.