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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2015 Vol.16 No.1 P.70-78
Efficient controller area network data compression for automobile applications
Abstract: Controller area networks (CANs) have been designed for multiplexing communication between electronic control units (ECUs) in vehicles and many high-level industrial control applications. When a CAN bus is overloaded by a large number of ECUs connected to it, both the waiting time and the error probability of the data transmission are increased. Thus, it is desirable to reduce the CAN frame length, since the duration of data transmission is proportional to the frame length. In this paper, we present a CAN message compression method to reduce the CAN frame length. Experimental results indicate that CAN transmission data can be compressed by up to 81.06% with the proposed method. By using an embedded test board, we show that 64-bit engine management system (EMS) CAN data compression can be performed within 0.16 ms; consequently, the proposed algorithm can be successfully used in automobile applications.
Key words: Controller area network (CAN), Electronic control units (ECUs), Data compression, Signal rearrangement
创新：与已有数据压缩方法相比，我们提出的方法不需要预测最大差值，只需使用三个头比特位。实验结果表明，CAN传输数据的压缩率高达81.06%。
方法：首先，用信号重排方法将车辆技术标准中的信号重排，使数据帧内的信号缩短到三个。然后，计算之前和现在CAN信号差值，并且计算三个头比特位。将头比特和差值不为零的信号排列到压缩区域选择图里，不为零的区域选择为压缩区域。最后，将压缩区域的数据排列到2D内存图里（图5,6）。
结论：针对CAN总线超载和数据传输误差率的增加，提出一种高效的数据压缩方法，数据压缩率高达81.06%。
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DOI:
10.1631/FITEE.1400136
CLC number:
TP274
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On-line Access:
2014-12-23
Received:
2014-04-15
Revision Accepted:
2014-11-04
Crosschecked:
2014-12-17