• 한국분무공학회지
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• 제22권4호
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• pp.185-189
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• 2017

In Korea, sales of passenger cars using diesel and LPG fuels were continuously increased in recent years. From now on 2030, the registrated vehicles will close in about twenty five million in Korea. From these reason, Investigation on the comparison of exhaust emission characteristics of passenger cars using LPG and Diesel fuel in variation of driving mode and ambient conditions were conducted in this study. Exhaust emission characteristics of test vehicles were measured and analyzed by using chassis dynamometer and emission analyzer. Also, test vehicles were selected on the diesel vehicle with 1.7L engine and LPG vehicle with 2.0L engine. In order to study on emission characteristics according to driving cycles, CVS-75, NEDC, US06, SC03, Cold-FTP and HWFET were applied and the test conditions were set up the cases of A/C on and hot start. From these results, it is revealed that the NOx emission of diesel vehicle was higher than that of LPG vehicle and the case of CO emission shows the opposite patterns. In the HC emission, the emission increasing patterns not showed but the NOx emission of diesel vehicle and CO emission of LPG vehicle were showed the variation patterns according to the various driving modes.

• 자동차안전학회지
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• 제15권3호
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• pp.59-65
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• 2023

As advanced driving assistance system (ADAS) and autonomous driving performance continue to improve, existing crash accidents and crash types are changing. Accordingly, the collision angle and the seating posture of the occupant are changed. It is necessary to study how the occupant injury mechanism changes according to these different crash types. In this regard, a representative crash test mode was derived when the automatic emergency braking system (AEB), one of the autonomous driving performance, was applied to the representative car-to-car crash scenario in Korea. The derived crash test mode was used to analyse the mechanisms of collision injuries according to both impact angle and the occupant seating posture (reclined seat-back angle). The results obtained through this study can be utilized as reference data for the development of new crash evaluation methods and improvements in crash restraint systems for enhancing crash safety.

• 한국자동차공학회논문집
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• 제10권4호
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• pp.1-6
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• 2002

Engine lubrication system is generally affected by vehicle driving conditions, which are composed of acceleration, braking deceleration and accelerating during cornering. The major reason is due to the oil pan system in which oil is directly influenced by inertia farce caused by vehicle driving conditions. Therefore, to confirm safety of engine lubrication system inertia farce effects are also considered in the developing state. For the purpose, we have carried the engine tilting tests using ourselves made test rig. Verifying the test results we also measured the inertia effects on the engine lubrication system using the circular tuning and slalom test with vehicle. Through the comparison study between two kinds of results we obtained that the engine tilting test rig was very useful to confirm the safety evaluation of engine lubrication system.

• 한국군사과학기술학회지
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• 제20권3호
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• pp.362-368
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• 2017

The endurance test is important to evaluate and predict defects of the vehicles. In particular, in order to improve the reliability of the endurance test for the powertrain system of military vehicles, the driving load is measured and analyzed at test courses and maneuvering roads. As a result, new test courses for powertrain system is additionally needed to improve test reliability. In this paper, it shows that new test courses for powertrain system is designed and constructed using the measuring and anlayzing result between CPG test courses and army maneuvering roads.

• 한국자동차공학회논문집
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• 제19권1호
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• pp.73-81
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• 2011

The performance of emission factor has been validated by comparison with on-road test data. Emission factor, which is a function of vehicle speed, has been acquired based on chassis dynamometer test with NIER driving pattern. Portable Emission Measurement System, PEMS has measured on-road emission. Test vehicle was operated on defined test routes under different driving conditions, and made ten trips along its route. Emission factors properly simulate on-road test result, although there is some drawback to consider variety of driving condition on real world. Vehicle specific power and acceleration have been used to explain the distributed on-road result within same vehicle speed range. The trend in carbon dioxide and nitrogen oxide emission with respect to specific power and acceleration is clear. It has been found that specific power is a good explanatory variable for microscopic analysis for modal test result. Acceleration is good for microscopic as well as macroscopic analysis.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2008년도 추계학술대회 논문집
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• pp.62-65
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• 2008

In this paper, we estimated the D147 mode test, which is introduced as a new emission test mode for the driving car using diesel fuel. And we compared the D147 test mode, Lug-Down3 test mode and no load acceleration test mode. And the exhaust gas concentration between the three modes was compared. The exhaust concentration at the D147 mode is lower than the exhause concentration at the Lug-Down 3 mode and higher than that at the no load acceleration test mode. Also the correlation factor was estimated between the D147 mode and Lug-Down 3 mode.

• 한국군사과학기술학회지
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• 제20권3호
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• pp.352-361
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• 2017

This paper proposes a design and fabrication of the test equipment that is implemented as a part of the airborne tracking radar inspection under the environment of indoor simulation. This test equipment provides controlling the operation status of airborne tracking radar and replicating the velocity and range information of target by generating a variety of target signal. This is mainly composed of radar operation controller, target signal generator, horn antenna driving devices. Radar operation controller is able to perform the controlling of radar operation mode and monitoring in real time by serial communication. Target signal generator is generated doppler signal and range delayed signal using virtual target of RF-band. Horn antenna driving devices perform a role of target simulating exercise. In the end, the performance is demonstrated using experiment results of test equipment for airborne tracking radar.

• 한국지반공학회논문집
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• 제16권1호
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• pp.235-241
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• 2000

기존의 장대강관말뚝 공법들은 말뚝의 용접이음이나 관내토의 제거 작업으로 인하여 공비와 공기가 증가하고 이들 작업이 진행되는 동안 시간효과에 의하여 말뚝의 관입 저항이 증가하여 타입이 어려워지는 등 각종 비경제적인 문제점들을 갖고 있다. 이러한 문제들을 해결하기 위하여 본 연구에서는 새로운 장대강관말뚝 공법을 제안하였으며, 제안된 공법의 시공성과 경제성을 분석하기 위하여 모형말뚝시험을 행하였다. 시험결과 새로 제안된 장대말뚝공법은 기존 공법에 비해 공기와 공비는 절감되고 지지력은 증가시키는 것으로 나타났다.

• 한국인터넷방송통신학회논문지
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• 제22권6호
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• pp.43-49
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• 2022

FMCW레이다는 일반 차량의 충돌방지용도 뿐만 아니라 자율주행시스템에서 활발히 센서로서 사용이 되고 있다. 본 논문에서는 자율주행센서로서 개발한 2-chip 기반의 FMCW MIMO(Multi Input Multi Output) 레이다 설계 및 구현에 대해서 설명하였다. 사용 칩을 이용하여 48채널의 가상배열을 이용하여 방위각 해상도가 우수하게 설계하였으며, 특히 Frame 기반과 Chirp 기반의 파형발생 및 신호처리를 혼합하여 최대탐지 가능 속도와 속도 보상에 대해 강점을 보유할 수 있도록 제작하였으며, 구현된 시스템은 실험실 내 시험과 실제 주행시험을 통하여 성능 및 상용화 가능성에 대한 분석을 진행하였다.

• 한국자동차공학회논문집
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• 제21권6호
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• pp.123-134
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• 2013

Strengthening vehicle emission regulation is one of important policies to improve air quality in urban area. Due to the limitation of specified driving cycles for certification test to reflect real driving conditions, additional off-cycle emission regulations have been adopted in US and being developed in Europe. The driving cycles of US or Europe have been used in emission certification for Korean light-duty vehicles, but it has not been known how well the driving cycles reflect various real driving patterns in Korea. In that point of view, it is required to estimate vehicle emission based on real road driving conditions to raise the effectiveness of vehicle emission regulation in Korea. In this study, real driving emission measurements have been conducted for three Korean light-duty vehicles with PEMS. The driving routes consisted of urban, rural and motorway in Seoul and Incheon. The data have been analyzed with various averaging methods including moving averaging windows method and compared to emission limits set with emission certification modes applied to tested vehicles. The results have shown that the real driving pollutant emissions of a gasoline and a LPG vehicles have been ranged quite lower than those of emission limits on CVS-75 driving cycle. But real driving NOx of a light duty diesel vehicle has been considerably higher than emission limit of NEDC driving cycle. The higher than expected NOx emission of a diesel vehicle might be caused by different strategy to control EGR in real driving condition from NEDC driving.