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통합 차량 네트워크 시스템을 위한 노드 기반 FlexRay-CAN 게이트웨이 설계
김만호(Man Ho Kim),이석(Suk Lee),이경창(Kyung Chang Lee),하경남(Kyong Nam Ha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
As vehicles become more intelligent, in-vehicle networking (IVN) systems such as controller area network (CAN) or FlexRay are essential for the convenience and safety of drivers. To expand the applicability of IVN systems, attention is currently being focused on the communication between heterogeneous networks such as body networking systems or chassis networking systems. Message mapping based gateway was developed to communicate between FlexRay and CAN network to improve exchanging information of vehicle. However, there are obstacles for the wide acceptance of the FlexRay-CAN gateway of vehicle. First, when message ID was changed of network, gateway must be reloaded changed message mapping table. Second, if the exchanging message is increased in the network, software complexity of gateway is increased rapidly. In order to overcome these obstacles, this paper presents a node mapping -based FlexRay-CAN gateway for IVN systems. In addition, this paper presents a node mapping based FlexRay-CAN gateway operation algorithm along with the experimental evaluation for ID change.
FlexRay 효율을 증대 시키기 위한 정적 구간 설계 방법
양재성(Jaesung Yang),박지훈(Jeehun Park),이석(Suk Lee),이경창(Kyungchang Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Today, an intelligent car requires high level applications such as safety, convenience, reliability. Many automotive companies have chosen the CAN protocol for their in-vehicle networking system such as chassis network system because of its excellent communication characteristics. However, the increasing number of ECUs and the need for more intelligent functions. Recently, FlexRay protocol that is a time-triggered protocol has been introduced. And many automotive companies have been focusing on this protocol. Because It’s reliability and real-time system. FlexRay use TDMA transmission method. It need for optimization for efficient transmission. When optimizing FlexRay its slot utilization is increased. So We propose Static Segment design methods and future research methods.
FlexRay 네트워크 설계를 위한 FIBEX 생성 프로그램 개발
이상협(SangHyeop Lee),하경남(Kyoung Nam Ha),이석(Suk Lee),이경창(Kyung Chang Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
지능형 자동차의 발달로 차량에 사용되는 전자 장치의 비중이 급속도로 증가하였고, 이로 인해 전자제어 장치(ECU:Electric Control Unit)간의 데이터 전송량이 증가하게 되었다. 데이터 통신은 point-to-point 방식에서 차량용 네트워크(IVN:In-vehicle network)로 전환되었으며, 현재 CAN 네트워크가 가장 널리 사용되고 있고, 최근들어 차세대 네트워크인 FlexRay를 적용하기 위하여 많은 연구가 진행 중이다. 낮은 전송속도와 비확정적 전송 지연의 특징을 가진 CSMA/CD방식의 CAN네트워크의 단점을 보완하기 위하여 TDMA 방식을 사용하는 FlexRay 로 발전하면서 네트워크를 설계하기위한 스케줄링(scheduling)의 복잡성과 같은 문제가 대두되게 되었다. FlexRay 프로토콜에서는 메시지를 전송하기 위하여 각각의 메시지를 각각의 정적 슬롯(static slot)에 할당하게 되며, 네트워크가 종료될 때까지 최초에 할당된 ECU만이 독점적으로 사용하도록 되어 있다. 따라서 네트워크의 메시지가 추가되거나 삭제되면 정적 슬롯의 수가 수정되어야 하며, 이러한 정적 슬롯의 수를 수정하는 것은 FlexRay 프로토콜의 기본사이클(base cycle)에 영향을 미쳐, 결국 네트워크의 성능에 까지 영향을 미치게 된다. 본 논문에서는 FlexRay 네트워크를 구성하기 위하여 수행되어야 하는 일련의 스케줄링 과정을 자동화하기 위하여 CANdb로 부터 scheduling parameter, network 구성 노드 및 메시지에 대한 정보를 입력 받고, 이를 이용하여 FlexRay용 FIBEX(FIeld Bus EXchange format)를 자동 생성하기 위한 FIBEX 생성 프로그램을 소개한다.
권태황(Taehwang Kwon),장광희(Gwanghui Chang),이호승(Hoseung Lee),전민권(Mingwon Jeon),김태현(Taehyeon Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Increasing number of electronic devices inside the car inside the car load of data is also increasing rapidly. A lot of current applied to the vehicle"s CAN communication if an increase in traffic may cause problems in data processing. Therefore, the CAN as well as cars of the future will work with the mesh Flexray. In this case, the two have different protocols should have the ability to communicate with each other. In this paper, both the CAN and Flexray implementation of hardware and software with a gateway that can communicate with each other to implement this feature it as power distribution and control of lamps and magnetic fields to switch hit Smart Junction Box (SJB) applies to was Hardware to the creation and operation of the gateway function through experiments and confirmed the behavior of the SJB function.
정수계획법을 이용한 FlexRay 네트워크 메시지 스케줄링 기법
송무근(Moo Geun Song),이동익(Dongik Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In recent years, time triggered protocols have been developed for time critical applications such as x-by-wire system. In this respect, the FlexRay protocol is likely to become the de-facto standard for in-vehicle network. FlexRay protocol is consist of the static segment which follows a TDMA(Time Division Multiple Access) scheme, and the dynamic segment which adopts a FTDMA(Flexible Time Division Multiple Access) scheme. Each segment has dissimilar network utilization on the message transmission. In this paper, we study the scheduling problem of the message assignment to the static segment and dynamic segment. We define a network utilization by mean of performance index and derive an integer linear programming(ILP) problem that maximizes the network utilization.
FlexRay 동기화를 위한 플랫폼 생성 파라미터의 설계 및 평가
송영훈(Younghun Song),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Today, an intelligent car requires high level applications such as safety, convenience, reliability. Many automotive companies have chosen the CAN protocol for their in-vehicle networking system such as chassis network system because of its excellent communication characteristics. However, the increasing number of ECUs and the need for more intelligent functions. Recently, FlexRay protocol that is a time-triggered protocol has been introduced. And many automotive companies have been focusing on this protocol. Because It’s reliability and real-time system. However, FlexRay needs correct 53 PCR parameter for synchronization between nodes. This paper presents a design of FlexRay parameter generation S/W and we evaluated its performance using simple H/W test bed.
FlexRay 네트워크를 위한 스케줄링 파라미터 생성 S/W의 설계 및 평가
양재성(Jaesung Yang),박지훈(Jeehun Park),이석(Suk Lee),이경창(Kyungchang Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In the future, an intelligent car requires high level applications such as safety, convenience, reliability. Many automotive companies have chosen the CAN protocol for their in-vehicle networking system such as chassis network system because of its excellent communication characteristics. However, the increasing number of ECUs and the need for more intelligent functions. Recently, FlexRay protocol that is a time-triggered protocol has been introduced. And many automotive companies have been focusing on this protocol. However, FlexRay needs correct 53 PCR parameter for synchronization between nodes. This paper presents a design of FlexRay parameter generation S/W and we evaluated its performance using simple H/W test bed.
FlexRay Network 설계를 위한 CANdb기반 FIBEX 자동 생성
송영훈(Younghun Song),이석(Suk Lee),이경창(Kyungchang Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Today, an intelligent car requires high level applications such as safety, convenience, and reliability. Owing to the increasing number of ECUs and intelligent functions, many automotive companies have to consider the FlexRay protocol for their in-vehicle networking systems. FlexRay protocol is time-triggered structure, so it is useful for time-critical application such as integrated chassis control system. However, FlexRay protocol requires the complex scheduling skill such as assignment of unique message buffer for each static slot. To assist an automotive engineer in designing the FlexRay network, this paper presents an automatic generation method of FIBEX based on the standardized CAN database. And we evaluated its feasibility using FlexRay network simulation application.
FlexRay-CAN 네트워크를 위한 게이트웨이 설계 및 데이터 변환 기법연구
배용경(YongGyung Bae),박은주(Eunjoo Park),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Safety critical systems such as x-by-wire systems require in-vehicle network systems that can interconnect various sensors, actuators, and controllers. These networks need to have high data rate, deterministic operation, and fault tolerance. Recently, FlexRay protocol that is a time-triggered protocol has been introduced, and many automotive companies have been focusing on this protocol. This paper presents the design method of gateway for in-vehicle network using CAN and FlexRay.