Design on the Higher Layer Protocol of City-Bus Information Integrated Control Network Based on Embedded Component

City-bus information integrated control network is a communication network based on CAN (controller area network), provides interactive information for ECUs (Electronic Control Units) in city-bus, and accomplishes the integrated control of internal electronic and electrical devices. Because CAN specification just defines physical layer and data link layer based on ISO/OSI Reference Model, the higher layer protocol of city-bus information integrated control network based on embedded component is presented. According to the function of higher layer protocol, the embedded components are partitioned into CAN initialization component, message sending component and message receiving component which are implemented by programming code. In order to evaluate the validity and reliability of higher layer protocol, the HIL (Hardware-In-Loop) test platform is designed and implemented.