Communication Research For Air Compressor System Of Mid-Dle-Low Speed Maglev Vehicle Based On Can Bus

With the rapid development of today’s city, the traffic problem is more and more ob-vious, so the development of the rail transportation has been gained more and more impor-tant attention. Compared with the traditional transportation, rail transit has many advantages such as more accurate arrival time, a larger capacity of passenger, more reasonable space uti-lization, greener and lower-carbon and so on. So the research about the rail transit has a practical value. For the rail transport, the middle-low speed maglev vehicle has the advan-tages of low noise, low damage, so it is one of the important direction for future transport.Air compressor system is a major component of the gas supply of the maglev train and one important part of the train control network. Air compressor system starts from the air source for the wind, involving support wheels, brake control, spring wind, and relating to the connection of the vehicles and pipes installation, which belongs to the category of the ve-hicle bus. As the stability and real-time property of Air compressor system is directly related to the safe operation of trains, so the research on its control characteristics has a significant practical value. The self-control and interactive monitored control of nodes have been taken to control the delay of the bus and given full play to the advantages of the field-bus. The main content of the work are as follow.(1) Taking the air compressor system as the research object, the schematic diagrams of the subsystems have been analyzed. According to the interactive features of the information, dynamics of monitor have been analyzed. Then the subsystem control block diagrams have been established. According to the specific requirement of the control system, the corres-ponding microcontrollers have been selected and then the designs have been extended to de-sign Communication module of distributed control. As a three-vehicle marshalling, in the article some important information uploaded to the train bus would be analyzed to achieve centralized detection and human-machine interactive management. So Ethernet and CAN bus gateway has been designed.(2)The completely open and standard CANopen protocol as the Application layer pro-tocol of CAN bus has been used to establish a complete control network of air compressor system. Configuration of communication parameters and mapping parameters was used to analyze the characteristics of the real-time data to complete control and testing of the node.(3) As an important characteristic of CAN bus, the transmission speed has been ana-lyzed, which has proved the CAN bus meet the requirements of train control. Due to the par- ticularity of the braking system, the further analysis has conducted to verify the usefulness of the system to this sub-nodes.Summarily, the communications of the air compressor subsystems have been analyzed, and the idea based on CAN bus has been put forward, then the subsystem has been dissected on the control requirements, extracted features, designed hardware, then the control network has been created. Finally, the entire air compressor system network has been established and simulated to verify the feasibility of the concept.