• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.178.4-178
• /
• 2001

In this paper a self-tuning gain-scheduled skyhook control for semi-active suspension systems is investigated. The dynamic characteristics of a continuously variable damper including electro-hydraulic pressure control valves is analyzed. A 2-d.o.f. time-varying quarter-car model that permits variations in sprung mass and suspension spring coefficient is considered. The self-tuning skyhook control algorithm proposed in this paper requires only the measurement of body acceleration. The absolute velocity of the sprung mass and the relative velocity of the suspension deflection are estimated by using integral filters. The skyhook gains are gain-scheduled in such a way that the body acceleration and the dynamic tire force are optimized. An ECU prototype ...

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.130.6-130
• /
• 2001

On-Board diagnostic systems are installed in passenger cars and light trucks on today. During the 1970's and early 1980's manufacturers started using electronic means to control engine functions and diagnose engine problems. This wa primarily to meet EPA emission standards. The CARB requires that, by model year 1996, all vehicle sold in California contain a certain minimum "On-Board Diagnostic" capability to diagnose emissions-related failures of the engine control system. These diagnostic requirements have been designated as OBD with a goal of monitoring all of the emissions-related components on-board the vehicle for proper operation. Part of the intent of CARB´s OBD program is that a single diagnostic tester can be used to read the diagnostic information from any OBD-compliant vehicle. A tester which ...

• IEMEK Journal of Embedded Systems and Applications
• /
• v.4 no.2
• /
• pp.84-89
• /
• 2009

This paper describes the development tool for applications of automotive electronic control unit based on OSEK/VDX. This development tool has a plug-in structure and is written in Java language, because of being based on Eclipse CDT. And also this development tool has another functionality of expansion, which means a special function block can be easily adopted in this development tool. Currently, this development tool consists of five blocks, which are integrated development environment block, fusing program block, system generation block, debugger block, and cross-compiler toolchain block. They have relationship between each other and work for developing OSEK/VDX-based applications. In this paper, we show the functionality of each block of this development tool and its implementation.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.2 no.4
• /
• pp.251-259
• /
• 2007

AUTOSAR is a partnership of automotive manufacturers and suppliers working together to develop and establish a de-facto open industry standard for automotive software architectures. In the AUTOSAR architecture, the runtime environment is at in the heart of the AUTOSAR architecture to provides the infrastructure services that enable communication between software components and between software components and basic software components. The RTE generator is an automated generation tool for AUTOSAR specification based RTE according to the ECU configuration. It generates communication API function for the software components and the basic software components like OS and COM of the application. The availability and the accuracy of the RTE generator are important for the automobile software which is based on AUTOSAR architecture, this paper proposes an architectural design of the RTE generator for auto-generation of the AUTOSAR based RTE.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.22 no.3
• /
• pp.68-74
• /
• 2014

As the number of ECUs (Electronic control units) are increasing, reliability and functional stability of a software in an ECU is getting more important. Therefore the application of functional safety standards ISO 26262 is making the software more reliable. Software fault injection test (SFIT) is required as a verification technique for the application of ISO 26262. In case of applying SFIT, an artificial error is injected to inspect the vulnerability of the system which is not easily detected during normal operation. In this paper, the basic concept of SFIT will be examined and the application of SIFT based on ISO26262 will be described.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2018.07a
• /
• pp.123-126
• /
• 2018

자율 주행 자동차는 다수의 센서와 ECU 등으로 구성된 분산 시스템이다. 이 시스템은 다양한 시간적 제약사항들을 갖는 자율주행 응용들을 구동하며 각 응용들에 대한 시간적 제약사항 위반을 탐지해야한다. 이러한 분산 시스템에서 응용들 간의 통신을 위해 사용되는 미들웨어들 중 대표적인 것은 DDS이다. DDS는 높은 확장성을 지원하는 발행-구독 통신 모델을 기반으로 하며, 실시간성을 고려한 다양한 QoS 정책들을 제공한다. 하지만 DDS는 자율주행 응용이 요구하는 시간적 제약사항들 중 deadline과 correlation 제약 사항에 대한 위반 여부를 탐지하지 못한다. 본 논문은 DDS 기반 시스템에서 deadline과 correlation 제약 사항 위반 여부를 런타임에서 탐지하는 기법을 제안한다. 본 연구진은 제안된 기법을 DDS의 구현들 중 하나인 Vortex 사의 OpenSplice 기반 시스템에 구현하였다. 실험을 통해 검증한 결과, deadline과 correlation 제약 사항에 대한 위반 여부를 적은 오버헤드와 함께 성공적으로 탐지하였다.

• Proceedings of the KIPE Conference
• /
• 2008.06a
• /
• pp.280-282
• /
• 2008

본 논문은 자동차용 능동 전륜 조향 제어 시스템을 소개한다. 능동 전륜 조향 장치는 조향의 편의성과 안정성을 위하여 조향비를 가변하거나 유사시 능동적으로 전자 제어 유닛(Electronic Control Unit : ECU)이 액추에이터를 제어해 주는 시스템이다. 최근 전자 샤시 시스템의 개발 추세인 샤시 통합 제어 관점에서 능동 전륜 조향 장치의 역할을 설정하고 성능 만족을 위한 제어기 구조에 관하여 설명한다. 설계된 제어 시스템을 3,300cc급 대형 승용차에 적용하여 그 유용성을 검증하였다.

• Proceedings of the KIEE Conference
• /
• 2007.10a
• /
• pp.307-308
• /
• 2007

At present, there are unnecessary electrical consumes and a lot of fuel-losses by the vaporized gas due to the rising of fuel temperature because the fuel pump of the fuel supply system rotates regularly regardless to the driving condition. In this paper, we designed the multi-step controller for controlling fuel pump to supply fuel according to RPM of each moment by measuring the real time RPM of the engine at ECU of the vehicle. Also, it can judge the existence or nonexistence of disorder by measuring the pressure of the fuel supply line, in case of abnormal state, it can supply the fuel intelligently by changing the mode to self-compensation mode.

• Journal of ILASS-Korea
• /
• v.19 no.2
• /
• pp.64-68
• /
• 2014

A driving vehicle performance which is driven by FTP-75 mode was simulated by computer. Throttle valve position, engine speed, air mass flow rate, fuel consumption et al. were computer simulated. A set of engine part load performance data, automatic transmission shift map and vehicle specifications were used for the computer simulation. Throttle valve position, engine speed, air mass flow rate et al. measured for evaluating the computer simulation results by driving the vehicle with FTP-75 mode on a chassis dynamometer. GT-Power$^{(R)}$ software was used for the computer simulation of the driving vehicle performance. Experimental fuel consumption rate was measured by using an ECU HILS fuel injection system. The experimental data and simulation results were compared. The computer simulation of the driving vehicle performance predicts the measured data well comparatively.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.11 no.5
• /
• pp.15-21
• /
• 2003

The liquid phase LPG injection engine is a new technology to make good use of LPG as a clean energy. However, it is difficult to precisely control air/fuel ratio in the system because of variation of fuel composition, change of temperature and flash boiling injection mechanism. This study newly suggests an injector control logic for liquid phase LPG injection systems. This logic compensates a number of effects such as variations of density, stoichiometric air/fuel ratio, injection delay time, injection pressure, release pressure which is formed by flash boiling of fuel at nozzle exit. This logic can precisely control air/fuel ratio with only two parameters of intake air flow rate and injection pressure without considering fuel composition, fuel temperature.