Full Text:   <892>

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CLC number: TP274

On-line Access: 2014-12-23

Received: 2014-04-15

Revision Accepted: 2014-11-04

Crosschecked: 2014-12-17

Cited: 4

Clicked: 2165

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Yu-jing WU

http://orcid.org/0000-0002-9339-0866

Jin-Gyun CHUNG

http://orcid.org/0000-0002-7127-4944

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Frontiers of Information Technology & Electronic Engineering  2015 Vol.16 No.1 P.70-78

10.1631/FITEE.1400136


Efficient controller area network data compression for automobile applications


Author(s):  Yu-jing Wu, Jin-Gyun Chung

Affiliation(s):  Division of Electronics & Information Engineering, Chonbuk National University, Jeonju 561-756, Korea

Corresponding email(s):   yjwu@jbnu.ac.kr, jgchung@jbnu.ac.kr

Key Words:  Controller area network (CAN), Electronic control units (ECUs), Data compression, Signal rearrangement


Yu-jing Wu, Jin-Gyun Chung. Efficient controller area network data compression for automobile applications[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(1): 70-78.

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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.

In this paper the authors present a compression mechanism to reduce the size of CAN messages, by comparing the payload of current and previous messages, and sending only the difference, instead of the absolute value. The paper identifies a clear task 'Data Compression', shows in a good manner the whole situation, the assumptions, former solutions and derives in a clear way the advantages of the proposed solution.

高效率汽车应用控制器局域网的数据压缩

目的:控制器局域网CAN(controller area network)被设计作为汽车环境和高级工业控制应用中电子控制单元ECUs(electronic control units)之间的多路通讯。如果大量ECUs连接到CAN总线,会导致CAN总线陷入超载状态,待命时间和数据传输误差率也将增加。数据传输时间和帧长度成正比,因此需要减少CAN总线的数据帧长度。
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%。

关键词:控制器局域网;电子控制单元;数据压缩;信号重排

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[3]ISO (International Organization for Standardization), 2003. Road Vehicles—Controller Area Network (CAN)—Part 1: Data Link Layer and Physical Signalling, ISO 11898-1:2003.

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[8]Miucic, R., Mahmud, S., 2006. An improved adaptive data reduction protocol for in-vehicle networks. SAE Tech. Paper, 2006-01-1327.

[9]Miucic, R., Mahmud, S.M., Popovic, Z., 2009. An enhanced data-reduction algorithm for event-triggered networks. IEEE Trans. Veh. Technol., 58(6):2663-2678.

[10]Ortega, E., Heurung, T., Swanson, R., 2006. System design from wires to warranty. Automot. Electron. Mag., p.14-18.

[11]Ramteke, P., Mahmud, S., 2005. An adaptive data-reduction protocol for the future in-vehicle networks. SAE Tech. Paper, 2005-01-1540.

[12]Wu, Y.J., Chung, J.G., Sunwoo, M.H., 2014. Design and implementation of CAN data compression algorithm. Proc. IEEE Int. Symp. on Circuits and Systems, p.582-585.

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