Research On Automobile Information Acquisition System Based On J1939 Protocol

With the rapid development of computer technology,electronic technology,embedded technology and integrated circuit technology,auto control technology matures,its scope has been from the initial development of passenger vehicle to commercial vehicles,and is widely used in the field of passenger car.The improvement of bus control device also puts forward new requirements for network communication technology.In order to meet the requirements of reliability,comfort and safety of modern passenger cars,the design and development of bus state information acquisition system based on network technology has become the inevitable trend of the intelligent bus.Based on the embedded system and CAN bus,this paper puts forward the system of bus state information acquisition and processing based on J1939 protocol.The main research contents include: first,this paper introduces the background and significance of this study,the purpose of the study,review the status quo at home and abroad,the research methods and research contents are summarized.After that,the CAN bus technology is described,the principle of CAN bus and bus frame format are introduced,the J1939 protocol,the parameters of the vehicle running are analyzed,which lays the foundation for the later research.Next,analysis of vehicle information acquisition system needs to design information acquisition system of the automobile principle is expounded,put forward the overall scheme of vehicle information acquisition system;to study the establishment of the vehicle information acquisition system database.On the basis of this,the automobile information acquisition system is designed.Based on the previous research,the hardware design and software design of the vehicle information acquisition system are studied.The hardware scheme of automobile information acquisition system is proposed,and the software function and equipment and parameter configuration are discussed.The design of J1939 protocol stack is discussed.Finally,the human-computer interaction interface,vehicle fault diagnosis,vehicle monitoring,GPS module and so on are designed.The following conclusions can be obtained through the research of this paper:(1)Aiming at the development trend of ITS,analysis the research status and development trend of foreign vehicle terminal system,limitation of domestic vehicle instrument function,put forward the research goal,the realization of information acquisition and fault diagnosis of power system engine vehicle using J1939 protocol.(2)The characteristics of the CAN bus in vehicle network and physical topology,studied the application of J1939 protocol in each layer of communication principle,fault diagnosis of the unique features of the detailed analysis of the J1939 acquisition vehicle physical parameters,and according to the design idea of embedded products,the function and the design process of the system to achieve the implementation.The whole issue of the theory guiding ideas.(3)According to the functional requirements of the vehicle information system,using multi thread programming,embedded database technology in Linux and Qt/E environment,preliminarily to realize vehicle condition monitoring,fault diagnosis,vehicle state information storage and remote monitoring function,and provides a good human-computer interaction interface graph.