Journal of Convergence for Information Technology (융합정보논문지)

Convergence Society for SMB (중소기업융합학회)
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Method of In-Vehicle Gateway to Reduce the Reprogramming Time

리프로그래밍 시간 단축을 위한 차량 게이트웨이 개선 방안

  • Kim, Jin-Ho (Division of Computer Engineering, Kyungnam University) ;
  • Ha, Kyung-Jae (Division of Computer Engineering, Kyungnam University)
  • 김진호 (경남대학교 컴퓨터공학부) ;
  • 하경재 (경남대학교 컴퓨터공학부)
  • Received : 2019.06.18
  • Accepted : 2019.07.20
  • Published : 2019.07.29
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Abstract

This paper proposes the method of an in-vehicle gateway to reduce the reprogramming time for the ECU (Electronic Control Unit). In order to reduce the reprogramming time, the gateway must prohibit transmitting messages, that are not related to reprogramming, to the destination CAN network, and no ECU should diagnose the DTC(Diagnostic Trouble Code) that indicates CAN communication error caused by prohibiting CAN messages by the gateway. Moreover, STmin, which are the minimum time between two consecutive CAN messages, should be minimized. In order to do this, this paper proposes the method that uses the link control command specified in UDS(Unified Diagnostic Services) and hardware based gateway functionality that are supported by the latest MCU(Micro Controller Unit). The proposed method is developed using TC275 based embedded system, and its results are presented.

본 논문에서는 차량 ECU(Electronic Control Unit)의 리프로그래밍 시간 단축을 위한 차량 게이트웨이 개선 방안을 제안한다. 리프로그래밍 시간 단축을 위해 게이트웨이는 리프로그래밍을 진행하는 동안 리프로그래밍하는 ECU가 연결된 통신 채널에 리프로그래밍 이외의 메시지 전송을 금지하여야 하며, 이때 메시지 전송 금지로 인해 특정 ECU가 CAN 통신 수신 불가로 인한 고장이 발생하지 않도록 할 수 있어야 한다. 또한, 게이트웨이 내의 버퍼 오버플로우를 방지하기 위해 연속된 통신 메시지 전송 시 추가하는 지연 시간(STmin)을 최소로 할 수 있어야 한다. 이를 위해 본 논문에서는 UDS(Unified Diagnostic Services)의 링크 제어 명령 및 최신 MCU(Micro Controller Unit)에서 제공되는 HW 게이트웨이 기능을 이용한 개선 방안을 제안한다. 제안한 개선 방안은 차량에서 널리 사용되고 있는 인피니언사의 TC275 기반 임베디드시스템을 이용하여 구현하였으며, 개선된 실험 결과를 제시한다.

Keywords

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Fig. 1. Central gateway based E/E architecture

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Fig. 2. Domain control unit based E/E architecture

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Fig. 3. Reprogramming sequence[11]

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Fig. 4. Consecutive message transmission of Can TP

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Fig. 5. Description of gateway delay

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Fig. 6. Message loss problem caused gateway delay

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Fig. 7. Experimental environment

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Fig. 8. TC275 based embedded system

Table 1. Data loss rate caused by SW delay

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Table 2. Data loss rate using proposed method

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