某特种车辆TTCAN网络的静态调度设计

Static Scheduling Design of TTCAN Network in a Military Vehicle

针对某特种车辆计算机控制系统对实时性的高要求,采用了TTCAN总线系统,为实现TTCAN系统的静态调度问题,提出了基于AL算法的改进算法——谐波周期算法,并通过MATLAB建立了系统的调度表。针对谐波周期算法的不足,结合该计算机控制系统的工作原理、信息传输的重要程度对静态调度表进行了适当的修改。通过与AL算法的对比分析,证实了改进的谐波周期算法在保证系统中周期型消息实时性能前提下,为非周期型信息获得了更大的传输带宽,又使系统信息传输的时间分配更加合理。

Aimming at meeting high demand of real-time performance of the computer control system in military vehicles,TTCAN bus is adopted.To realize TTCAN system＇s static scheduling problem,a new harmonic periods algorithm which is an average-loading（AL） algorithm＇s optimization algorithm is proposed.And a schedule table is built by MATLAB.Then,because of the shortage of this algorithm,the schedule table is improved by combining a computer control system＇s working principle and the importance of the messages.Through the comparative analysis with AL algorithm it verifies that the improved harmonic periods algorithm not only assures real-time performance of periodic messages,but also gains greater transmission bandwidth for acyclic message.And the time slice distribution is more reasonable.