• Transactions of the Korean Society of Mechanical Engineers A
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• v.29 no.1 s.232
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• pp.139-144
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• 2005

A vehicle cruise control algorithm using an Interacting Multiple Model (IMM)-based Multi-Target Tracking (MTT) method has been presented in this paper. The vehicle cruise control algorithm consists of three parts; track estimator using IMM-Probabilistic Data Association Filter (PDAF), a primary target vehicle determination algorithm and a single-target adaptive cruise control algorithm. Three motion models; uniform motion, lane-change motion and acceleration motion. have been adopted to distinguish large lateral motions from longitudinal motions. The models have been validated using simulated and experimental data. The improvement in the state estimation performance when using three models is verified in target tracking simulations. The performance and safety benefits of a multi-model-based MTT-ACC system is investigated via simulations using real driving radar sensor data. These simulations show system response that is more realistic and reflective of actual human driving behavior.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.7
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• pp.591-597
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• 2017

This study is to develop a vehicle Integrated Dynamics Control System(IDCB) that can stabilize the lateral dynamics and maintain steerability. To accomplish this task, an eight degree of freedom vehicle model and a nonlinear observer are designed. The IDCB independently controls the brake systems of four wheels with a fuzzy logic control and a sliding model control. The result shows that the nonlinear observer produced satisfactory results. IDCB tracked the reference yaw rate and reduced the body slip angle under all tested conditions. It indicates that the IDCB enhanced lateral stability and preserved steerability.

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.775-777
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• 2012

차세대전동차는 직접구동모터(DDM : Direct Drive Motor) 방식으로 기존에 사용하던 기어박스를 없애는 등, 연결부품을 제거함으로써 고장률을 줄여 기존차량 대비 30% 이상 신뢰도를 향상하도록 개발하였다. 그러나, 단순히 모터 자체 만을 변경함으로써 신뢰도를 향상시켰다고 보기는 어렵고, 시스템 차원에서 전동차 내 타 구성품과의 인터페이스를 살펴보고, 정량적인 분석을 통해서 신뢰도가 어느 정도 향상되었는지 살펴볼 필요가 있다. 신규차량일 경우, 기존차량대비 어느 정도로 신뢰도가 향상되었는지를 입증하고자 주행시험을 실시하는데 전동차에 신뢰성 이론을 적용하기 위해서는 크게 목표설정, 신뢰도예측, 신뢰도입증의 3단계 작업이 진행되며, 신뢰도 예측은 주요장치를 구성하고 있는 부품단위의 고장률을 이용하여 시스템의 신뢰도를 예측하고, 신뢰도 목표치를 만족하는지를 분석하는 것이며, 신뢰도 입증은 예측한대로 시스템이 구축되었는지 확인하는 것이다. 본 논문에서는 차세대 전동차에서 설정한 목표신뢰도를 만족시키기 위해 수행한 업무에 대하여 논하고자 한다.

• Science of Emotion and Sensibility
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• v.17 no.4
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• pp.3-18
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• 2014

In this study, drivers' longitudinal car control, subjective fatigue, and perceived fidelity were compared between 2D and 3D display driving simulation. The results can be summarized as followings. First, in all target speed conditions, the drivers tended to drove faster in 2D display condition than 3D display condition. Second, speed deviation from target speed increased as target speed decreased. Third, distances between the lead vehicle and the driver's vehicle were significantly reduced in the 3D display condition when the speeds of the lead vehicle were relatively fast(i. e., over 80km/h). Fourth, although the perceived fidelity was not significantly different between the two display conditions, subjective fatigue was higher in the 3D display condition than in the 2D display condition.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.3D
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• pp.363-371
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• 2009

The purpose of this study is to verify the safety issue of the tinted vehicle based on the field study as well as the issue of the capacity reduction from the tinted vehicle. Through this study, an innovative experimental method to verify the issues was developed using RTK GPS receivers, and a data collection was conducted using the developed experimental method. Using the collected data, the effects of the ahead vehicle with the windows tinted on the traffic condition such as headways and acceleration noise were analyzed to test that the ahead vehicle with windows tinted too darkly affects the increasing vehicle maneuver as following the degree of tinting. This study was conducted as a frontier study and more studies, for example, full scale analyses considering various road and vehicle conditions need to be conducted in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.29-34
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• 2019

In this study, a gasoline test vehicle was evaluated for drive quality in emissions and fuel economy tests. The measurement results were compared with the manufacturer's suggested values to evaluate whether the tolerance ranges (fuel efficiency -5%, greenhouse gas +5%) were exceeded. We carried out tests with test subjects based on the SAE J2951 evaluation method. The test vehicle was a 2L gasoline vehicle. The drive following performance was found to increase under deliberate driving conditions and decreased in smooth driving conditions. As a result of the analysis of the drive following performance, the closer the value is to 1, the more accurate the driving is. (-) indicates harsh conditions, and (+) indicates gentle conditions. The basic data on the driver following between testers was obtained by analysis of the tests. The fuel efficiency correlation with the drive following performance within the target speed range of the fuel consumption mode. In the future, these measurement results can serve as key data for securing an exhaust gas database and fuel efficiency system for each measurement mode.

• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.278-280
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• 2004

판토그라프는 전차선(catenary)으로부터의 전류를 차량에 전달하는 장치로서 전동차 지붕 위에 설치되어 있다. 판토그라프의 설계 목표는 고속 및 다양한 환경 조건하에서 연속적이고 일정한 량의 전류를 차량에 전달하도록 하는 것이다. 열차가 고속화될수록 전류의 흐름이 중단되는 이선, 접촉선과 판토그라프 집전판의 마모, 공력 소음 등이 큰 문제로 대두되며, 이들 문제들이 고속용 판토그라프의 설계 기술에서 중요시되고 있다. 특히 이선은 동력 전달이 중단될 뿐만 아니라 이선시에 발생하는 아크로 인한 마모 증대, 통신 장해를 일으킨다. 유럽과 일렬에서는 그러한 문제를 인식하고 고속용 판토그라프에 대한 연구를 활발히 진행하고 있다. 또한 저속전철이나 고속전철을 운행하는 나라에서는 기존의 가선계를 그대로 이용하면서 고속화를 달성하기 위하여 기존 가선계에 대한 최적의 판토그라프 설계에 노력을 기울이고 있다. 본 논문에서는 국내 기존선 고속화에 필요한 최고속도 180km/h급 틸팅차량시스템의 핵심 구성요소인 판토그라프 제어기술에 대한 연구를 통하여 보다 안전한 틸팅차량용 판토그프사양 개발하는데 목적이 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.9
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• pp.817-823
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• 2017

In the past, research has been conducted on the development of an adaptive cruise control algorithm considering fuel efficiency, and an adaptive cruise control system considering fuel efficiency have been developed. However, research on optimizing vehicle and adaptive cruise control parameters in order to maximize performances is insufficient. In this study, the design optimization of vehicle and control parameters considering fuel efficiency, trackability, ride comfort and safe distance is performed. This paper proposes performance measures of vehicle behavior and develops an adaptive cruise control system. In addition, based on the screening of vehicle parameters that significantly influence performances, kriging surrogate models are constructed through a sequential design of experiment, and kriging surrogate model-based design optimization is performed to maximize fuel efficiency and satisfy target performances.

• Journal of Korean Society of Transportation
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• v.19 no.6
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• pp.143-160
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• 2001

Micro-simulation models have been recognized as an efficient assessment tool in developing traffic signal control technologies. In this paper a prototype of a microscopic simulation model which can be applied to evaluate the performance of traffic-adaptive signal control strategies was developed. In the simulation process, space-based arrays were appled to estimate parameters of car following and lane changing models. Two levels of link types, a micro-type and macro-type links, were also embodied in the simulation process. The proposed model was tested on a test network consists of 9 intersections. The performance of the proposed model was evaluated in link by link comparisons with the results of NETSIM. The results show that the proposed model could appropriately simulate traffic flows of the test network. The model also produces traffic adaptive signal timings, cycle lengths and green times for turning movements, based on the detector data. It implies that the optimization process of the model produces reasonable signal timings for the test network on the cycle basis.

• Journal of the Korea Society of Computer and Information
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• v.19 no.12
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• pp.187-196
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• 2014

In this paper, Minimize driving energy for operation within a defined distance yeokgan fixed time-resolved and determine the nature of the train is traveling, and to model mathematically. Urban rail car cruise in general by the PID controller is used instead of automatically tracking a target value while traveling in energy consumption to be minimized by using optimal control model railroad charyangreul was designed under real operating conditions the same. The actual track conditions apply to the minimum value or a separate listing of cars around the track facility without a driving energy of the automatic operation and to reduce the driving energy. Therefore, actual route chosen straight line 8 / gradient segment / curve for the measured data analysis, such as sections within the city-minute drive each section and presented how the trains to save energy, depending on the pattern of the train station in the region.