Development And Implementation Of Vehicle Controller For PHEV Based On Functional Safety

With the development of intelligent vehicle and new energy vehicle industry,the number of electrical and electronic systems on the vehicle and their functions are also increasing.As an important part of vehicle functions,VCU bears extremely complex functions,so the safety risk caused by its failure is also increasing.More importantly,the public security problems of new energy vehicles in recent years especially attention,by new energy automobile failure caused by traffic accident or vehicle fire accident prone,in today’s new energy industry booming,these cases will seriously affect the public recognition of new energy vehicles,is particularly unfavorable to the development of new energy vehicles.How to prevent the unreasonable risk caused by electronic and electrical failure has become the focus and pain point of the industry.In order to address this kind of risk,the International Organization for Standardization(ISO)issued the ISO 26262 standard in 2011.It provides a set of processes and certification requirements that apply throughout the life cycle of a vehicle to ensure vehicle safety,and has gradually become a complete approach to be accepted by the entire automotive industry,with the second version officially released in 2018.Based on the research of functional safety standards and data,this paper analyzes the functional safety of VCU.The purpose is to provide some reference for related research in the industry based on the research results while studying the learning function safety.The main research contents and directions of this paper can be seen as follows:1.First introduced the function of safety research status at home and abroad,the body of the standard content and the commonly used terms,and according to the standard methodology for the analysis of the conceptual phase,VCU including to define of related items,and functional performance system based on the definition of hazard analysis and risk assessment and derived ASIL level and safety objectives,the process of to get the whole Functional safety requirements at vehicle level2.Secondly,according to the safety requirements at the vehicle level,FTA and other analysis methods are used to develop the concept safety concept stage to obtain the functional safety requirements of each system.Then,safety analysis is carried out on the requirements at the system level to refine them to the system architecture to form the technical safety concept and obtain the refined technical safety requirements3.Then deduces the software and hardware requirements of functional safety based on the VCU software and hardware design.After refining the hardware requirements to the hardware security architecture,the validity of the hardware requirements is verified.For the software part,the software architecture should also be designed,and the software and hardware modules should be designed for common cause failure,cascading failure and safety measures.4.Finally,through the test bench and simulation tools,combined with the test method and test process of the designed security component,sufficient variables and standard quantities are designed to perform fault injection test,so as to verify the availability of the software and hardware design module.The verification and test results show that the random hardware failure probability measure(PMHF)of the hardware meets the requirements of ASIL C level.At the same time,the design of the safety module also proves that it can effectively detect and deal with the system failure,.Therefore,it is verified that the functional safety design meets the requirements of functional safety objectives,improves the reliability and stability of products,and realizes the application and practice of functional safety standards.