纯电动汽车CAN网络通信实时性的研究

RESEARCH ON REAL-TIME PERFORMANCE OF PURE ELECTRIC VEHICLES BASED ON CAN BUS

随着汽车电子的发展，各部件之间通信量的增大，对汽车现场总线的实时性和可靠性方面提出了更高的要求，CAN总线最初的优势已不能满足现状。随着网络总线负载的增加，CAN协议静态优先级分配策略和仲裁机制会导致网络节点传输延迟增大，系统实时性下降。笔者通过对影响网络实时性能的主要因素和CAN 网络可调度条件的分析，提出了一种两级公平仲裁协议以提高CAN总线的实时性。

With the development of automotive electronics,and the increase of traffic between parts,real-time and reliability of automotive field bus is higher requested.The initial advantage of CAN bus can not meet the situation.Bus load increases along with the network,CAN static allocation strategy and priority arbitration mechanism CAN lead to network node transmission delay and the system real -time performance decline.This article analyzes the main factors of influencing the network real-time performance and proposes a two-stage fair arbitration agreement in order to improve the real-time performance of CAN bus.