关键词: 控制器局域网络总线；信号逆向解析；相似性原理；数学算法

Abstract: With the development of new energy vehicles, it has become an important means to acquire experimental analysis data by collecting controller area network (CAN) bus signal in vehicle benchmarking test. CAN bus protocol is a confidential document for the vehicle manufacturer, so it is necessary to research a method to reverse crack the CAN bus signal of the vehicle. The research on CAN signal analysis method based on similarity principle is to use mathematical algorithm to realize signal positioning in the bus report by covering the typical features of some signals under specific conditions and then covering the common features of different vehicles. This method saves the time of manual processing a large number of CAN bus data, filters out the ID of the signal quickly and effectively, and realizes the cracking of the CAN bus signal of the vehicle. Aiming at the reverse cracking of vehicle can bus signal, this paper proposes to quickly locate the position of the required signal in the bus message through the similarity principle and algorithm screening, so as to reverse analyze the required signal. The results show that this method can quickly crack most can signals in vehicle benchmarking, and improve the accuracy and efficiency of analysis.

Key words: Controller area network bus; Reverse cracking of signals; Similarity principle; Mathematical algorithm