• Journal of Auto-vehicle Safety Association
• /
• v.6 no.2
• /
• pp.72-77
• /
• 2014

In the ongoing debates over the need to identify new sources of energy and to reduce the emissions of greenhouse gases. Hydrogen has emerged as one of the most promising alternatives due to its emissions from the vehicle being virtually zero. The governments have identified the development of regulations and standards as one of the key requirements for commercialization of hydrogen-fueled vehicles. Regulations and standards will helpful in overcoming technological barriers to commercialization. Developments of a technique for safety assessment of Hydrogen Fuel Cell Vehicle(HFCV) includes four tasks, research for regulation system and policy, hydrogen safety, vehicle operation safety and protection against high-voltage. The objective is to establish a technique for safety assessment and amend safety standards for HFCV and consequently reflect research results to vehicle management policy. We devised safety standards and evaluation techniques with regard to high-pressure gas and high voltage of hydrogen fuel cell vehicle. Korean Motor Vehicle Safety Standards(KMVSS) for HFCV was amended to June 10, 2014. including the results of the safety assessment technology for high-voltage and hydrogen characteristics.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.20 no.5
• /
• pp.44-52
• /
• 2012

Fuel cell electric vehicles have some noise problems due to its air processing unit which is required to feed the ambient air into the fuel cell stack. Discrete-frequency noises are radiated from a centrifugal blower due to rotor-stator interaction. Their fundamental frequency is the blade passing frequency, which is determined by the number of rotor blades and their rotating speed. To reduce such noises, multi-chamber perforated muffler has been designed. In this paper, in order to improve the transmission loss of a perforated muffler, the relationship between the impedance model of a perforated hole and its noise reduction performance is studied, and the applicability of a short-length perforated muffler to air processing unit of fuel cell system is described using acoustic simulation results and experimental data. The acoustic velocity vector across the neck of a perforated hole is very important design factor to optimize the transmission of an intake muffler. The suggested short-length perforated muffler is effective on discrete-frequency noises while keeping the volume of intake muffler minimized.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.16 no.3
• /
• pp.87-93
• /
• 2008

The $CO_2$ air conditioning system installed in fuel cell vehicles could be used either for stack cooling or for cabin cooling, and thus was used for the stack cooling when additional stack heat release was required over a fixed radiator capacity for high power generation. This study investigated the performance of the stack cooling system using $CO_2$ air conditioner at various operating conditions. Also, the heat releasing effectiveness and mutual interference were analyzed for the stack cooling system using an air conditioner and compared with the conventional radiator cooling system with/without cabin cooling. The heat release of the stack cooling system with the aid of $CO_2$ air conditioner increased up to 36% more than that of the conventional radiator cooling system with cabin cooling. Furthermore, the heat release of the stack cooling system using $CO_2$ air conditioner increased more by 7% than that of the conventional radiator cooling system without cabin cooling.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.20 no.2
• /
• pp.135-140
• /
• 2012

Fuel Cell Hybrid Vehicles (FCHVs) have already become the subject of major interest among automotive industry as well as power management strategies of FCHVs, as the fuel economy of FCHVs depends on them. There are several types of power management strategies of FCHVs that have been developed to improve the fuel economy of FCHVs. Among them, optimal control theory is applied to this study. A problem is defined and its objective is to minimize the energy consumption of an FCHV and to find the optimal trajectories of powertrain parameters during driving. Necessary conditions for the optimal control are introduced and the simulation results of constant costate are compared to that of variable costate in order to prove that the variable costate can be replaced with the constant costate.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.6 no.3
• /
• pp.439-444
• /
• 2011

In this paper, we implemented the intelligent smart monitor system for next generation which is most commonly viewed information in a vehicle from the instrument cluster, where speed, tachometer, fuel, engine temperature, fuel gauge, turn indicators and warning lights and provide the driver with an array of informations. Designed Smart HUD(Head-Up-Display) monitor system is composed TFT LCD, LCD Back light led, plane mirror, lens and controllers parts and it was assembled to intelligent integrated smart monitor system. Finally, we analyze intelligent integrated smart monitor system for driver safety vehicles and present the possibility to apply to smart intelligent HUD total monitor system for next generation.

• Electronics and Telecommunications Trends
• /
• v.28 no.4
• /
• pp.35-44
• /
• 2013

과거 드라마로 인기를 끌었던 전격 Z 작전에서 키트는 우리에게 자율주행 자동차라는 환상을 심어주었다. 이러한 자율주행 자동차가 이제는 꿈이 아닌 현실로 다가오고 있다. 자율주행 자동차에 대한 정의를 내려보면 운전자의 개입 없이 주변환경을 인식하고, 주행 상황을 판단하여, 차량을 제어함으로써 스스로 주어진 목적지까지 주행하는 자동차를 말한다. 이러한 자율주행 자동차는 교통사고를 줄이고 교통 효율성을 높이며 연료를 절감하고 운전을 대신해줌으로써, 편의를 증대시킬 수 있는 미래 개인 교통수단이 될 것으로 기대된다. 본고에서는 자율주행 자동차의 기술 구성 요소와 관련된 기술 개발 동향에 대해서 기술하고, 자율주행 자동차가 실제 적용되기 위해 필요한 법적인 문제와 향후 전망에 대해서 살펴본다.

• Journal of the Korean Institute of Gas
• /
• v.15 no.2
• /
• pp.1-8
• /
• 2011

In this research, the safety trends and technologies of HCNG, a mixture of hydrogen and natural gas, are analyzed. This is an attracting alternative fuels to meet the strengthened automotive exhaust gas emission standards. HCNG is very important opportunities and challenges in that it is available the existing CNG infrastructures, meets the strengthened emission standards, and the technical, social bridge of the coming era of hydrogen. It is essential for the commercialization of HCNG that hydrogen - compressed natural gas blended fuel for use in preparation of various safety considerations included accidents scenario, safety distance, hydrogen attack, ignition sources and fire detectors are examined. Risk assessments also are suggested as one of permission procedure for HCNG filling station.

• Journal of Energy Engineering
• /
• v.12 no.3
• /
• pp.184-189
• /
• 2003

A study of the property of Indolene-Methanol Plus High Alcolhols (MPHA) has been completed. The study invested the measurement of fuel properties. The fuel properties investigated are distillation characteristics, heating value, flash point, specific gravity and water tolerance. The alcohol concentration was varied from 0 to 100 percent by volume in clear Indolene. The measurement of fuel properties indicated that, in general, Indolene-MPHA blends have higher water tolerance, similar specific gravity, similar flash point and different distillation characteristics compared to Indolene-Methanol blends.

• Proceeding of EDISON Challenge
• /
• 2014.03a
• /
• pp.591-596
• /
• 2014

본 논문에서는 EDISON_전산열유체 시스템을 활용하여 군집주행 형태 변화에 따른 항력계수 및 연료효율 변화를 분석하였다. 해석 대상은 자동차 형상을 단순화한 모델인 아흐메드 형상(Ahmed body)을 이용하였다. 동종차량 간 거리변화에 따른 항력계수 및 연료효율의 변화, 이종차량의 배열순서변화에 따른 항력계수 및 연료효율을 분석하며 연구를 수행하였다. 연구 결과, 4대의 동종차량 군집주행시 항력계수를 최대 69% 감소할 수 있으며 이에 따라 km 당 0.073L의 연료를 절감할 수 있다.

• Journal of the Korean Applied Science and Technology
• /
• v.35 no.3
• /
• pp.667-675
• /
• 2018

Increasing emissions regulations and demand of high-efficiency cars that travels a lot of distance with less fuel, there is growing interest in Energy Consumption Efficiency. Korean energy consumption efficiency compute combined Fuel Economy by driven city & highway driving mode and present final Energy Consumption Efficiency as using 5-cycle correction formula. Energy consumption efficiency is computed Carbon-balance-method, when used burning fuel play a key role in vehicle performance & Energy Consumption Efficiency. In Korea, vehicle fuel is circulate by Petroleum and Petroleum Alternative Business Act, there is property difference in quality standard because petroleum sector's refine method or type of crude oil. It does not appear a big difference according to fuel, because it sets steady quality standard, it may affect the performance of automobile. Thus, in research We purchase a few diesel fuel which circulated in the market in summer season though directly-managed-gas station by petroleum sector, resolve property each of fuel, we compute Fuel Economy each of them. We analyze into change depend on applying for property as nowadays utilizing Energy Consumption Efficiency calculating formula of gasoline and diesel fuel. As result, Density each of sample fuel has a maximum difference roughly 0.9%, net heat value each of sample fuel has difference 1.6%, result of current Energy Consumption Efficiency each of sample fuel has a difference roughly 1% at city drive mode, 1.4% at highway drive mode. Result of use gasoline calculator formula shows less 6% result than nowadays utilizing Energy Consumption Efficiency calculating formula, each of sample's Energy Consumption Efficiency shows maximum roughly 1.4% result in city & highway drive mode.