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LIN 프로토콜에 대한 시간 해석과 시간 모델에 대한 연구
연제명(Jeamyoung Youn),이우택(Wootaik Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, timing model and analysis of LIN protocol is introduced. In order to design a networked control system based on LIN protocol, it is inevitable to study the timing behavior of the LIN protocol, because the communication protocol influences the timing behavior of the networked control system. Therefore, tile performance of a distributed control system using LIN protocol can be improved as long as the timing behavior of the protocol is predictable. Through the timing analysis of the transmitting LIN message, all relevant timing parameters that affect the message transmission time are defined. As a result of the analysis, a timing equation of the transmitting message is composed of these timing parameters. Using this equation, the transmission time of the LIN message can be predicted. Furthermore the LIN application software that has been already used in LIN applications can be verified by LIN conformance test equation.<br/> <br/>
Matlab/Simulink를 이용한 실시간 운영체제 기반의 제어기 설계
연제명(Jeamyoung Youn),마주영(Jooyoung Ma),선우명호(Myoungho Sunwoo),이우택(Wootaik Lee) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
This paper presents the Matlab/Simulink-based software-in-the-loop simulation (SILS) environment which is the co-simulator for temporal and functional simulations of control systems. The temporal behavior of a control system is mainly dependent on the implemented software and hardware such as the real-time operating system, the target CPU and the communication protocol. In this research, the SILS components with temporal attributes are specified as tasks, task executions, real-time schedulers and real-time networks. The possible methods to realize these components in graphical block representations are investigated with Matlab/Simulink, which is the generally used tool to design and simulate control algorithms in control engineering, and then these components are modeled in graphical blocks of the Matlab/Simulink. Also, in order to achieve a seamless development process from SILS to rapid control prototyping (RCP), the SILS block-set is designed to support auto-code generation in C without tool changes and block modifications.
LIN 프로토콜 시간 모델링 및 메시지 응답 시간 해석에 관한 연구
연제명(Jeamyoung Youn),선우명호(Myoungho Sunwoo),이우택(Wootaik Lee) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.6
In this paper, a mathematical model and a simulation method for the response time analysis of Local Interconnect Network(LIN) based network systems are proposed. Network-induced delays in a network based control system can vary widely according to the transmission time of message and the overhead time of transmission. Therefore, in order to design a distributed control system using LIN network, a method to predict and verify the timing behavior of LIN protocol is required at the network design phase. Furthermore, a simulation environment based on a timing model of LIN protocol is beneficial to predict the timing behavior of LIN. The model equation is formulated with six timing parameters deduced from timing properties of LIN specification. Additionally, LIN conformance test equations to verify LIN device driver are derived with timing constraints of the parameters. The proposed model equation and simulation method are validated with a result that is measured at real LIN based network system.
실시간 운영체제를 적용한 제어시스템의 모델기반 설계 및 검증
연제명(Jeamyoung Youn),마주영(Jooyoung Ma),선우명호(Myoungho Sunwoo),이우택(Wootaik Lee) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.2
This paper presents the Matlab/Simulink-based software-in-the-loop simulation(SILS) environment which is the co-simulator for temporal and functional simulations of control systems. The temporal behavior of a control system is strongly dependent on the implemented software and hardware such as the real-time operating system, the target CPU, and the communication protocol. The proposed SILS abstracts the system with tasks, task executions, real-time schedulers, and real-time networks close to the implementation. Methods to realize these components in graphical block representations are investigated with Matlab/Simulink, which is most commonly used tool for designing and simulating control algorithms in control engineering. In order to achieve a seamless development from SILS to rapid control prototyping (RCP), the SILS block-set is designed to support automatic code generation without tool changes and block modifications.
SILS/RCP: 차량 내장형 제어시스템 설계를 위한 통합 모델 기반의 개발 환경 구축
마주영(Jooyoung Ma),연제명(Jeamyoung Youn),신민석(Minsuk Shin),선우명호(Myoungho Sunwoo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The SILS(Software In the Loop Simulation) is a simulator to consider the functional and temporal behavior of a real-time system. The RCP(Rapid Control Prototyping) offers seamless phase shift from system designs to implementations. These environments are needed for the effective development process of embedded control systems. In general, these two environments are supplied separately, so that the development process is divided into two phases, the simulation and the implementation. The proposed SILS/RCP environments integrate these two phases, in order to support a more similar simulation environment to real execution on the MCU and an immediate implementation environment from same design semantics. The seamless design process can reduce time-to-market and support more performance-assured design. This paper discusses the establishment of SILS/RCP environments and practical design approach using them.
[기술논문] 측정기반 최악실행시간 분석 기법을 이용한 AUTOSAR 호환 승용디젤엔진제어기의 실시간 성능 검증에 관한 연구
박인석(Inseok Park),강은환(Eunhwan Kang),정재성(Jaesung Chung),손정원(Jeongwon Sohn),선우명호(Myoungho Sunwoo),이강석(Kangseok Lee),이우택(Wootaik Lee),연제명(Jeamyoung Youn),원동훈(Donghoon Won) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.5
In this study, we presented a timing verification method for a passenger car diesel engine management system (EMS) using measurement-based worst-case execution time (WCET) analysis. In order to cope with AUTOSAR-compliant software architecture, a development process model is proposed. In the process model, a runnable is regarded as a test unit and its temporal behavior (i.e. maximum observed execution time, MOET) is obtained along with on-target functionality evaluation results during online unit test. Furthermore, a cost-effective framework for online unit test is proposed. Because the runtime environment layer and the standard calibration environment are utilized to implement test interface, additional resource consumption of the target processor is minimized. Using the proposed development process model and unit test framework, the MOETs of 86 runnables for diesel EMS are obtained with 213 unit test cases. Using the obtained MOETs of runnables, the WCETs of tasks are estimated and the schedulability is evaluated. From the schedulability analysis results, the problems of the initially designed schedule table is recognized and it is fixed by redesigning of the runnable mapping and task offset. Through the various test scenarios, the proposed method is validated.