Abstract:  In order to solve the instability problem of the bus communication system for engineering vehicles, a
design structure of CAN(Controller Area Network) bus software system based on engineering vehicle safety is
proposed. The operating environment of the engineering vehicle bus system is analyzed, its interference sources
and the current anti-jamming measures are summarized. Focusing on the system fault tolerance and real-time
problem, the engineering vehicle safety CAN bus software system is designed. The specific functions of various
types of nodes and the realization of the program. The software design principle adopts the modular and
standardized system design method, reduces the dependence of the system software to the specific manufacturer,
improves the safety of the vehicle and enhances the robustness and real-time of the vehicle bus system.

Key words: vehicles safety, trouble shooting,  construction vehicle, controller area network, fault handling real-time