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Dual CAN 시스템을 위한 Kalman 기반 Traffic balancing 알고리즘 개발
이종갑(JongGap Lee),이석(Suk Lee),이경창(Kyungchang Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The controller area network (CAN) is the dominant protocol for in-vehicle networking systems because it provides bounded transmission delay among electronic control units (ECUs) at data rates between 12Kbps and 1Mbps. And, many automotive companies have chosen the CAN protocol for their chassis network system of intelligent vehicles. However, the increasing number of ECUs in the intelligent vehicle and the need for more intelligent functions require a network system with more network capacity and real-time capability. As one approach to enhance the network capacity of a CAN system, this paper introduces a CAN system with dual communication channels. And, this paper presents Kalman based traffic-balancing algorithm that predicts the traffic of each channel using Kalman filter and allocates frames to the more appropriate channel. An experimental test bed using commercial off-the-shelf microcontroller with two CAN controllers was used to demonstrate the feasibility of the Kalman based traffic-balancing algorithm.
샤시 네트워크 시스템을 위한 FlexRay 스케줄링 알고리즘
이종갑(JongGap Lee),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In the future, an intelligent car requires high level applications such as fault tolerance and high data rate. Existing CAN which is the most popular In-Vehicle Network protocol until now cannot support these applications. So FlexRay appeared for complement to CAN. FlexRay is time-triggered protocol and I has deterministic characteristics. But scheduling algorithm for support FlexRay is very complicated and there is no standard scheduling algorithm. In this paper, therefore, we propose two FlexRay scheduling algorithm using CAN database. One is called 'Message-based scheduling algorithm', another is 'Communication node-based scheduling algorithm'. 'Message-based scheduling algorithm' use messages, ' Communication node-based scheduling algorithm' use communication nodes in a cluster for scheduling. This paper suggests these two scheduling algorithm going one step forward valuates them.
샤시 네트워크 시스템을 위한 FlexRay 스케줄링 알고리즘
이주경(Jukyung Lee),이종갑(JongGap Lee),이경창(Kyungchang Lee) 제어로봇시스템학회 2009 제어로봇시스템학회 합동학술대회 논문집 Vol.2009 No.12
In the future, an intelligent car requires high level applications such as fault tolerance and high data rate. Existing CAN which is the most popular In-Vehicle Network protocol until now cannot support these applications So FlexRay appeared for complement to CAN. FlexRay is time-triggered protocol and I has deterministic characteristics. But scheduling algorithm for support FlexRay is very complicated and there is no standard scheduling algorithm. In this paper, therefore, we propose two FlexRay scheduling algorithm using CAN database. One is called ‘Message-based scheduling algorithm’, another is ‘Communication node-based scheduling algorithm’. ‘Message-based scheduling algorithm’ use messages, ‘Communication node-based scheduling algorithm’ use communication nodes in a cluster for scheduling. This paper suggests these two scheduling algorithm going one stop forward valuates them.
네트워크 트래픽의 동적관리를 위한 Dual-CAN 시스템의 구현
양재성(Jaesung Yang),이종갑(JongGap Lee),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, many ECUs (Electronic Control Units) have been used to increase the vehicle safety, which leads to a distributed control system. The distributed control system requires reducing the network delay for dependable real time performance. As an attempt to maintain the network delay under a certain limit, this thesis proposes using dual channel CAN network along with traffic balancing algorithm. The traffic balancing algorithm predicts the network traffic of each channel, and each node stochastically chooses which channel to be used for the next message. In order to evaluate the efficacy, network delay has been measured experimentally.