| With the development of automotive electronics technology about car,more andmore information between car parts are increasing, which can make the network rateof bus load increase.It will affect the network data transmission delay, reliability andthe question of whether or not to be guaranteed. Therefore in the process of vehiclenetwork design and implementation, we should ensure that the transmission of datamessage is real-time, accurate and safe to delivery to the receiver unit consideringvarious factors.So we have to design a reasonable optimal best message schedulingmechanism to achieve the purpose of the vehicle network’s real time and capability.Static cyclic scheduling is the most common method to ensure real-time task,which can control task that many dynamic methods could not. But it can not deal withemergent task well. Dynamic priority scheduling is based on the concept of priority. Itimproves the flexibility of system greatly, but the process is complicated andoverhead because of constantly updating task’s priority.When the load is bigger, theperformance fell sharply. Based on the study of the main factors of influencing thenetwork real-time performance and the CAN network scheduled condition, this paperproposes a dynamic scheduling method based on the two levels of fair arbitrationagreement to aim at improving the real time of CAN bus communication.Using MATLAB simulation model and the reference data at home and abroad,the experimental results show us a better performance. In this paper, the simulationmodel CAN evaluate the CAN network scheduling performance more accurately, andthe result is calculated with smaller error. According to the results of the assessmentCAN network scheduling response time, through the comparative analysis of the testdata, dynamic scheduling method based on the two levels of fair arbitrationagreement in the aspect of improving the network scheduling real-time to thetraditional static and dynamic scheduling method. |
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