Abstract: Design and implement a novel CAN bus dual redundant node circuit, which enhances the flexibility of redundant switching. Based on the theory of reliability analysis to improve the reliability of redundancy mathematical model, and point out that the cost performance of dual redundancy is the best, a node circuit is designed, the hardware connection schematic is given, and the idea of ​​programming is expounded. Finally, pointed out the various issues that should be considered in this circuit switching.
0 Preface
The CAN (Controller Area Network) bus is a serial data bus developed by Bosch in Germany in the 1980s and belongs to the field bus field. The main features of the CAN bus are as follows:
(1) The CAN bus system has fewer wires (two-wire power cable, two signal wires), which is convenient for maintenance and installation;
(2) The CAN protocol adopts an 8-byte short frame structure to ensure the correctness of transmission and low error rate;
(3) The CAN protocol encodes the communication data so that the number of nodes in the network is unrestricted and there is no master-slave; in the broadcast mode, different nodes can receive the same data at the same time;
(4) Adopt CRC test and provide corresponding error handling function to ensure the reliability of data communication.
The CAN bus has outstanding flexibility, real-time and reliability, and has been widely used in field communication in the fields of robots, automobiles, CNC machine tools, and automation instruments. Although the CAN protocol itself has strong error correction capability, in practical applications, the hardware circuit interface is not securely connected and the transmission medium is easily damaged. Therefore, in areas where high reliability is required for electric locomotives, ship cabins, and aerospace, Redundant designs are often used to increase hardware reliability.
1 Redundant design reliability analysis
The CAN bus redundancy design is mainly used to improve the reliability of the system. Two bus redundancy and three bus redundancy have been applied. Bus redundancy is equivalent to parallel system connection, and the dual bus redundancy design is taken as an example for analysis. The dual bus communication model is shown in Figure 2, and the original model is shown in Figure 1. The literature only analyzes the dual bus. Here, the method is used to further analyze the reliability of the three buss that have been applied in practice. It is pointed out that the efficiency of the dual bus is the best, which is the redundancy scheme to be adopted in this paper.
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