Research And Implementation Of OSEK Network Management Mechanism In Automotive CAN Network

More and more electronic control units (ECU) are widely used in vehicle and automotive network becomes a technical trend. To guarantee the safety of automotive network, OSEK network management (NM) is applied to the vehicle networked control system. This thesis focuses on the improvement of OSEK NM and the implementation of OSEK NM and aims at providing support in technology and method for the high reliable vehicle NM system.The main content is shown as follows. First, automotive network management background is described and the relative research is analyzed; Secondly, for the real time and reliability of OSEK NM mechanism, a model of finite state machine is proposed to describe all work states of ring logical. Parameters for NM’s performance metrics are defined, and the equations to calculate those parameters are derived after the instable process of logical ring is analyzed quantitatively. The factors dealing with NM performance and the related mechanism of building ring with second successor (BRSS) are presented; Furthermore, the FPGA technology, with high speed parallel processing and rich logical resources, is used to build compact OSEK NM system for the high-end automotive CAN control system. In FPGA chip, it is divided into NM protocol stack and CAN controller. The design method of imitation sequence hardware is proposed for the message processing process, and the mechanism by reading and writing flag zone is used to implement the parallel processing of multiple timer; The complex running status of CAN protocol is described, and the bit timing mechanism of CAN is implemented by the imitation sequence state machine. At last, a complete semi-physical simulation platform is built by CAN physical nodes and CANoe virtual nodes. The experimental results prove the feasibility of FPGA design method and effectiveness of updated NM mechanisms.The research in this thesis aims to improve the OSEK NM mechanism, speed up the application in automotive CAN network as well as enhance safety and reliability of automotive network. So the work in this thesis is valuable in theory and engineering.