• 제어로봇시스템학회논문지
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• 제7권11호
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• pp.912-917
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• 2001

In this study, we define the measuring method of crank angle precisely using an event and perform a study on the hardware structure and software algorithms which is applicable for the commercial engine. Also we developed a Computer-ECU(Personal computer based electronic control unit) using a computer and a microprocessor, for performing the ignition at a desire position(angle) and for controlling a duty ratio a pulse for ISC(Idle speed control). We applied these algorithms to the modeling which is induced a concept of event and got a better result than a conventional ECU in the state of transient as a result of performing air fuel ratio control in a commercial engine. This technique can be used for the back to improve ECU performance. It the present type of Hybrid I. C voltage regulator is altered to the new type of regulator, we will be surely able to reduce the production cost as well as simplify the design of alternator\`s rear bracket and rectifier part because of the removal of trio diode. Experiment is taken by MS-R004.

• 자동차안전학회지
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• 제11권1호
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• pp.48-54
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• 2019

Optimal engine control is needed to cope with the global environmental regulations that are globally enforced. For optimum engine control, the electronic throttle control system (ETCS) is a prerequisite. Automotive makers are having an effect on reducing emissions and improving fuel economy by applying ETCS which is designed to secure stability. The ETCS controls the output of the throttle valve by passing the output value of the accelerator position sensor (APS) to the engine control unit (ECU). In this study, the authors investigated the safety standards of domestic and overseas accelerator control system and tried to understand how the air flow control affects the engine output by replacing the throttle. The authors suggest an improvement proposal of safety standard based on the result of driving evaluation by various modes.

• 제어로봇시스템학회논문지
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• 제8권10호
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• pp.898-906
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• 2002

Antilock Brake System (ABS) is designed to prevent wheels from being locked-up under emergency braking of a vehicle. Therefore it improves directional stability of the vehicle, shortens stopping distance, and enhances maneuvering during braking, regardless of road conditions. Hardware In-the-Loop Simulation (HILS) is an effective tool for design Performance evaluation and test of vehicle subsystems such as ABS, active suspension, and steering systems. This paper describes a HILS model for ABS/ ASR(Acceleration Slip Regulation) system applications. A fourteen degrees-of-freedom vehicle dynamics model is simulated in an alpha-chip processor board. The proposed HILS system is tested with a basic ABS control algorithm. The design and implementation of HILS system for the ABS ECU(Electronic Control Unit) development of commercial vehicle are presented. The results show that the proposed HILS system can be used to test the performance, stability, and reliability of a vehicle under braking.

• 융합정보논문지
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• 제9권7호
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• pp.25-32
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• 2019

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.

• 전기전자학회논문지
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• 제24권4호
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• pp.1172-1175
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• 2020

차량에 사용되는 ECU에는 CPU 코어, 차량통신 콘트롤러, 메모리 인터페이스, 센서 인터페이스, I/O 인터페이스 등이 집적되어 있다. 현재 사용되는 차량용 ECU는 대부분 자사만의 독점적 프로세서 아키텍쳐로 개발하였으나, 최근 자율주행자동차 및 커넥티드카에서 소프트웨어 범용성을 위해 ARM, RISC-V와 같은 표준 프로세서를 기반으로 한 차량용 ECU의 수요가 급증하고 있다. 본 논문에서는 명령어 집합이 무료로 공개된 RISC-V를 기반으로 하여 주차 보조 시스템에 사용하기 위한 차량용 ECU를 설계하였다. 개발된 ECU는 32b RISC-V CPU 코어, CAN, LIN 등의 IVN 콘트롤러, ROM, SRAM 등의 메모리 인터페이스, SPI, UART, I2C 등의 I/O 인터페이스를 내장하였다. 65nm CMOS 공정에서 구현한 결과는 동작 주파수 50MHz, 면적 0.37㎟, 게이트 수 55,310개였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.66-69
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• 2010

최근 차량에는 차량과 IT와 결합을 차량의 안전성, 편리성을 위해 많은 전자제어장치(ECU)가 장착되어 있고 있다. 이러한 전자제어장치는 각 전자제어장치에 대한 Data는 OBDII 네트워크에 전송을 하고 멀티미디어에 대한 Data 는 MOST 네트워크에 전송을 한다. 본 논문에서는 기존의 블랙박스의 문제점을 보완하기 위해 차량용 네트워크의 새로운 멀티미디어 네트워크인 MOST 차량용 네트워크와 현재 차량에서 표준적으로 쓰이는 OBDII 차량용 네트워크를 이용하여 전자제어장치의 데이터를 이용한 Data들을 취합하여 차량의 현재 상황을 판단하고 정보를 제공함으로써 차량의 안전성 및 블랙박스로써의 역할을 극대화 시킬 수 있는 차량용 블랙박스 시스템을 구현하고자 한다.

• 전기전자학회논문지
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• 제21권3호
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• pp.256-259
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• 2017

SENT(single edge nibble transmission)는 차량에 탑재되는 다양한 센서와 ECU(electronic control unit)간의 직렬 통신 프로토콜이다. SENT는 디지털 파형을 사용하기 때문에 트랜시버 회로가 필요 없고 구조가 간단하며 가격이 저렴하여 주로 센서 내장형 통신 인터페이스로 주로 사용된다. 본 논문에서는 Verilog HDL을 이용하여 SAE J2716 규격을 만족하는 SENT 인터페이스를 설계하였다. 또한 이를 FPGA로 구현하고 테스트 보드를 제작하여 동작을 확인하였다. 0.18um 공정으로 합성하였을 때의 게이트 수는 약 2,500 게이트이다.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1915-1920
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• 2015

ISO 26262 is an international standard for the functional safety of electric and electronic systems in vehicles, and this standard has become a major issue in the automotive industry. In this paper, a functional safety compliant electronic control unit (ECU) for an electric power steering (EPS) system and a demonstration purposed EPS system are developed, and a software and hardware structure for a safety critical system is presented. EPS is the most recently introduced power steering technology for vehicles, and it can improve driver’s convenience and fuel efficiency. In conformity with the design process specified in ISO 26262, the Automotive Safety Integrity Level (ASIL) of an EPS system is evaluated, and hardware and software are designed based on an asymmetric dual processing unit architecture and an external watchdog. The developed EPS system effectively demonstrates the fault detection and diagnostic functions of a functional safety compliant ECU as well as the basic EPS functions.

• Journal of Welding and Joining
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• 제32권3호
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• pp.74-80
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• 2014

Due to environmental regulations (RoHS, WEEE and ELV) of the European Union, electronics and automotive electronics have to eliminate toxic substance from their devices and system. Especially, reliability issue of lead-free solder joint is increasing in car electronics due to ELV (End-of-Life Vehicle) banning from 2016. We have prepared engine control unit (ECU) modules soldered with Sn-40Pb and Sn-3.0Ag-0.5Cu (SAC305) solders, respectively. Degradation characteristics of solder joint strength were compared with various conditions of automobile environment such as cabin and engine room. Thermal cycle test (TC, $-40^{\circ}C$ ~ ($85^{\circ}C$ and $125^{\circ}C$), 1500 cycles) were conducted with automotive company standard. To compare shear strength degradation rate with eutectic and Pb-free solder alloy, we measured shear strength of chip components and its size from cabin and engine ECU modules. Based on the TC test results, finally, we have known the difference of degradation level with solder alloys and use environmental conditions. Solder joints degradation rate of engine room ECU is superior to cabin ECU due to large CTE (coefficient of thermal expansion) mismatch in field condition. Degradation rate of engine room ECU is 50~60% larger than cabin room electronics.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.132-137
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• 2004

On-Board Diagnostic(OBD) systems are in most cars and light trucks on the load today. During the 1970's and early 1980's manufacturers started using electronic means to control engine functions and diagnose engine problems. The CARB's diagnostic requirements to meet EPA emission standards have been designated as OBD with a goal of monitoring all of the emissions-related components, as well as the chassis, body, accessory devices and the diagnostic control network of the vehicle for proper operation. In this paper, we present a remote measurement system for the wireless monitoring of diagnosis signal and sensors output signals of ECU adopted KWP2000, united the OBD communication protocol, on OBD-compliant vehicle using the wirless communication technique of Bluetooth. In order to measure the ECU signals, the interface circuit is designed to communicate ECU and designed terminal wirelessly according to the ISO, SAE regulation of communication protocol standard. A microprocessor S3C3410X is used for communicating ECU signals. The embedded system's software is programmed to measure the ECU signals using the ARM compiler and ANCI C based on MicroC/OS kernel to communicate between bluetooth modules using bluetooth stack. The diagnostic system is developed using Visual C++ MFC and protocol stack of bluetooth for Windows environment. The self-diagnosis and sensor output signals of ECU is able to monitor using PC with bluetooth board connected in serial port of PC. The algorithms for measuring the ECU sensor output and self-diagnostic signals are verified to monitor ECU state. At the same time, the information to fix the vehicle's problem can be shown on the developed monitoring software. The possibility for remote measurement of self-diagnosis and sensor signals of ECU adopted KWP2000 in embedded system verified through the developed systems and algorithms.