Design Of Information Control Unit In Commercial Vehicle Based On SAE J1939 Protocol

At present, CAN bus is very widely used because of its very high level of stability and a good capability of anti-jamming and a fast communication speed. With rapid-developing of fieldbus techology, the traditional vehicle instrument has been replaced by the information system based on CAN bus abroad. The high layer protocol J1939 even become the communication internationnal standard.Firstly, this thesis gives an introduction to the development of control networks on vehicle body and buses in recent years. Base on mentioned above, and by the means of dividing the software into layers, I write the procedure of J1939 protocal respectively consist of datalink layer, application layer, diagnostic layer and network management layer.The datalink layer is the base of the whole software and it is also the difficulty of the task. The MCU of the system is a 32-bit micro-controller LPC2294, and by the help of working outside chip component like LCD, walking motor and onchip modules like A/D, I/O, CAN controller, it is able to communicate with driver. The thesis attempts to comlete both of the design of the task and actualizing of J1939 protocol through using a blocking and delaminating idea so that the code must be transplantable and try to make all the procedure compare to the AUTOSAR architecture. Because the domestic research on AUTOSAR is few, so the thesis just makes a beneficial sampling on frame.Base on research of the operation characteristic of the embedded real-time OSμC/OSⅡ, transplantμC/OSⅡto LPC2294, then improve and expand some functions ofμC/OSⅡkernel according to the definition of OSEK OS. I have completed developing the microcontroller layer and ECU abstraction layer of all the modules and have written every application procedure using the RTE services. The test proves that the J1939 protocol which has been developed and the control unit is feasible and can satisfy the anticipative function.