M/S Controller Area Network(CAN) System Using Shared-Clock Scheduler

1 Introduction Since the controller area network(CAN) ,developed by Robert Bosch Gmbh,was deployedfor thefirst ti mein a motor vehicle :Benz S-Classin 1991 ,CANcommunication protocol is used extensivelyinthe automotive andindustrial control sectors .CANis a multi-master communication protocols ,whichis based onIDpriority arbitra-tion1].The CANspecifications ISO11898-1(high-speed) and ISO11519-2(low-speed) define the physical lay-er(PL) and datalinklayer(DLL) for the CANcommunicat…

M/S Controller Area Network(CAN) System Using Shared-Clock Scheduler

The Controller Area Network (CAN) is a well established control network for automotive and automation control applications. Time-Triggered Controller Area Network (TTCAN) is a recent development which introduces a session layer,for message scheduling,to the existing CAN standard,which is a two layer standard comprising of a physical layer and a data link layer. TTCAN facilitates network communication in a time-triggered fashion,by introducing a Time Division Multiple Access style communication scheme. This allows deterministic network behavior,where maximum message latency times can be quantified and guaranteed. In order to solve the problem of determinate time latency and synchronization among several districted units in one auto panel CAN systems,this paper proposed a prototype design implementation for a shared-clock scheduler based on PIC18F458 MCU. This leads to improved CAN system performance and avoid the latency jitters and guarantee a deterministic communication pattern on the bus. The real runtime performance is satisfied.