Remote upgrade system for the on-board diagnostic system based on an improved Bsdiff algorithm

doi:10.3969/j.issn.1674-8484.2023.03.008

Abstract

Abstract:

A remote upgrade system was designed for On-board Diagnostic (OBD) System based on an improved Bsdiff algorithm to shorten time consumption, minimize power consumption and stable firmware upgrade with easier operation and less cost in the OBD terminal remote upgrade. The system optimized redundant zero values in the differential region when the Bsdiff algorithm generated differential files. Bandwidth utilization was enhanced by adopting a multi-threading mechanism. The design of flash memory partitioning was optimized by adjusting flash memory partitioning in a dynamic manner. Comparison tests were conducted between full upgrade and differential upgrade in a built test environment. The results show that the system rises of 81.2% in the file size performance metrics with rising of 62.5% in the file compilation time consumption performance metrics, compared to the full remote upgrade approach. Therefore, this system improves the flash space utilization with reducing the time required for firmware updates.

Key words: automotive active safety, on-board diagnostics (OBD), remote upgrade, Bsdiff algorithm, flash memory partition, firmware update

CLC Number:

TP319

QIAN Feng, YI Qi, ZHU Neng, WANG Jie. Remote upgrade system for the on-board diagnostic system based on an improved Bsdiff algorithm[J]. Journal of Automotive Safety and Energy, 2023, 14(3): 329-337.

Figures/Tables 17

References 20

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程序	位码数量 / kb
程序	未压缩	压缩后	Xdelta	RTPatch	Exediff	Bsdiff
Agrep: 3.6→4.0	262.144	114.502	080.346	058.124	041.554	053.490
gcc:2.8.0→2.8.1	2 899.968	708.301	549.250	140.284	076.072	121.371
Alimpse：4.0-4.1	524.288	222.548	109.252	023.200	031.720	042.630

程序	位码数量 / kb
程序	未压缩	压缩后	Xdelta	RTPatch	Exediff	Bsdiff
Agrep: 3.6→4.0	262.144	114.502	080.346	058.124	041.554	053.490
gcc:2.8.0→2.8.1	2 899.968	708.301	549.250	140.284	076.072	121.371
Alimpse：4.0-4.1	524.288	222.548	109.252	023.200	031.720	042.630

后缀字符串	AABAB	ABAB	BAB	AB	B
下标	1	2	3	4	5
由小到大	1	4	2	5	3
SA [·]	1	4	2	5	3
RANK[· ]	1	3	5	2	4

后缀字符串	AABAB	ABAB	BAB	AB	B
下标	1	2	3	4	5
由小到大	1	4	2	5	3
SA [·]	1	4	2	5	3
RANK[· ]	1	3	5	2	4

试验组号	文件名称	全量远程升级		优化前的差分升级		优化后的差分升级
试验组号	文件名称	文件/MB	压缩率/%	文件/MB	压缩率/%	文件/MB	压缩率/%
Ⅰ	Test_V1.bin	2.093	0	0.655	68.7	1.202	42.6
Ⅱ	Test_V2.bin	3.811	0	1.249	67.2	1.724	54.8
Ⅲ	Test_V3.bin	5.689	0	2.005	64.8	2.209	61.2
Ⅳ	Test_V4.bin	10.124	0	3.959	60.9	3.013	70.2
Ⅴ	Test_V5.bin	28.262	0	11.658	58.8	5.003	82.3