Design And Implementation Of Body Controller Integrated With IMMO

With the development of automotive electronics technology,Body Control Modules(BCM)have gradually become the standard configuration of vehicles,which has a significant impact on the safety,convenience and comfort of vehicles.The design and performance research is very important.In order to improve the anti-theft security of the car without adding a separate control unit,the solution that BCM integrated with immobiliser(IMMO)is proposed,which uses the existing bus and wireless communication components to realize the electronic control linkage of the whole vehicle.Implanting a transponder in the key,the authentication information is encrypted by using cryptography.The radio frequency authentication between the transponder and BCM,and the bus communication authentication between BCM and the engine management system prevent illegal starting of the vehicle.The overall architecture of the body control system is analyzed and compared,and the hybrid architecture is selected for the structural and functional design of BCM.For wireless authentication,the appropriate transponder and base station chip are selected.The principle and implementation process of HITAG2 and AES encryption algorithms are analyzed based on the finite field theory.The algorithm program is designed to encrypt communication data.Considering the low power consumption and anti-interference performance of the system,the microcontroller XC2268 N is selected as the the main control chip.The modular solution is used to divide the hardware circuit according to functions,and the hardware system framework is built by using the communication module,the power module,the signal acquisition module and the driver module.Combined with theoretical calculations,it provides a basis for component selection and parameter selection.The software is divided into a base layer,an interface layer,and an application layer by referring to the AUTomotive Open System Architecture(AUTOSAR).The base layer programs are written to complete signal acquisition and drive,data communication,and fault diagnosis.Using Stateflow software to build models to implement the control strategy of the application layer.The interface layer programs are written to shield the differences between different hardware and establish the connection between the base layer and the application layer programs.The IMMO authentication test scheme is designed to verify the effectiveness of the algorithm and the quality of the communication.A hardware-in-the-loop test platform is built,and test cases are written to perform functional tests and fault injection tests on BCM.After the test passed,the actual vehicle test,environmental test,electric performance test and electromagnetic compatibility test are carried out.The function and performance of BCM are verified based on the test results.In order to facilitate the vehicle off-line and after-sales maintenance,a variety of methods that BCM and transponder match are given.After repeated debugging and improvement,the software and hardware design has been optimized,BCM meets the design requirements and has high safety and reliability.It provides a reference for the design and development of the same type of automotive electronics,especially BCM.