控制器局域网(CAN)协议被广泛运用在分布式嵌入式系统中,研究表明共享时钟调度算法能有效的将基于CAN的微控制器与时间触发网络结构结合起来。文章指出了共享时钟调度算法存在的一些不足,并且提出一种改进的共享时钟调度算法,通过构建一个实际系统验证了两种算法在CAN通信中的性能,结果显示改进的共享时钟调度算法是对原算法的一种有效补充。 Controller Area Network (CAN) protocol is widely used in distributed embedded systems. The research shows that the shared clock scheduling algorithm can effectively combine CAN-based microcontrollers with time-triggered network structure. This paper points out some shortcomings of the shared clock scheduling algorithm and proposes an improved shared clock scheduling algorithm. The performance of the two algorithms in CAN communication is verified by constructing an actual system. The result shows that the improved shared clock scheduling algorithm is correct The original algorithm an effective supplement.