• Transactions of the Korean Society of Automotive Engineers
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• v.21 no.5
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• pp.145-150
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• 2013

Recently, many vehicles have applied electric parts for saving fuel consumption and reducing levels of environmental pollution. ISG (integrated starter & generator) is one of main electric parts and can improve fuel efficiency by using idle stop & go function and regenerative braking system. However, if ISG driving inverter works under the continuously high load condition, it will make the performance and durability of the inverter decreased with rising temperature. In this study, we carried out the analysis on the fluid flow and thermal characteristics of the inverter. As a result, we found the MOSFET of the air cooled inverter was increased up to $116^{\circ}C$ over the limit temperature. On the other hand, the liquid cooled type inverter's MOSFET was decreased by about $17^{\circ}C$ compared to that of the air cooled inverter. Therefore, we verified the feasibility of the liquid cooled type using the present cooling structure.

• Journal of the Korean institute of surface engineering
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• v.52 no.1
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• pp.43-51
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• 2019

The environmental pollution which is global warming and abnormal climate is caused by increasing population and activated economics. To reduce environmental pollution, we have being efforts into reducing $CO_2$ emission and use of energy, resources. Especially, for the sake of light weight and fuel efficiency of automotive industry, many countries have defined the restrict environmental regulation which stipulate high magnitude of reducing $CO_2$ emission. In this study, we have predicted the problem of Mu-cell injection molding through the finite element analysis as a function of temperature controlled by Joule heating or in terms of mold temperature. From the result of finite element analysis, we have determined the optimized process and made the injection mold included electric current heating system with Mu-cell manufacturing. Lastly, we analyzed the surface characteristics of the injection products with mold temperature.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.377-382
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• 1994

The performance measurement and evaluation system is required on automotive engines to analyze engine characteristics. In this study, data acquisition is established by installing various sensors of temperature,pressure, gas amount, RPM, Torque,.etc to engines, and the modeling of evaluation system is suggested. Also a data base management system is developed for verifying the quality of automotive parts which effect engine characteristics and the output module is presented to be used as certification sheets in automotive and part manufacturer.

• Journal of the korean Society of Automotive Engineers
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• v.18 no.5
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• pp.69-76
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• 1996

분말야금법에 의한 소결부품은 원료분말을 혼합하여 성형, 소결의 공정을 거쳐 제조되기 때문에 재질과 형상의 선택범위가 넓으며 정확한 치수로 생산할 수 있어 비교적 짧은 기간동안에도 상당한 성장을 해왔다. 특히 최근들어 원가절감 및 경량화를 실현하는 최적재료로서 자동차 부품에 활발히 적용되고 있다. 소결 기계부품은 자동차를 비롯하여 가전제품, 전자기기 등 대형 성장산업의 뒷받침을 받아 순조로이 육성되어 왔으며, 앞으로도 새로운 성장산업에 의하여 더욱 큰 발전을 보일 것으로 전망된다. 본 고에서는 고강도화 되고 있는 자동차 소결부품에 촛점을 맞추어 기술하였다.

• Transactions of Materials Processing
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• v.9 no.6
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• pp.561-566
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• 2000

Recently, the hydroforming technology has been recognized as a general technique in manufacturing industry, especially in automotive industry. Hydroforming is applied to increase strength, and to decrease weight, cost and parts. Hydroforming is based on the inflation of, for Instance, a tube, coupled with axial or radial compression and by subsequent expansion and sizing against the die wall. Expansion, axial feeding, calibration are important parameters in this process. In this paper, the effects of various parameters such as internal pressure, axial feeding and friction on hydroforming of automotive bumper rail have been considered.

• Journal of the korean Society of Automotive Engineers
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• v.16 no.3
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• pp.36-44
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• 1994

최근의 자동차산업의 과제로는 연비향상, 배기가스정화, 리싸이클링 등이 지적되고 있다. 이들과제와 재료기술은 밀접한 관계를 가지고 있어, 이 과제들을 해결하기 위해서는, 재료의 개발이 필수적이라 하겠다. 자동차에 사용되는 재료로는 철강, 알루미늄, 플라스틱 등이 있지만, 경량화 및 부품기능의 향상등을 위해서는 금속기 복합재료의 개발적용이 절실히 요구되고 있다. 본 자료에서는 자동차용 금속기복합재료의 특성, 제조기술 및 개발현황 등을 소개한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04b
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• pp.3-20
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• 1995

Advanced ceramics have excellent thermal resistance, wear resistance, corrosion resistance, and other properties, and are promising materials as structural materials. Over the past decade, they have been applied to some machine parts, for example, glow plugs and turbochargers of automotive engines. In the case where the advanced ceramics are used as these structural parts, te low-dimensional accuracy of sintered bodies requires secondary machining.

• Transactions of the Korean Society of Automotive Engineers
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• v.10 no.5
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• pp.138-146
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• 2002

The new type of vibration reduction material far an automotive interior, which is spray-type liquid material, is developed in this study The new material has better damping property and lower mass density than other damping materials, for example asphalt sheet. It can be sprayed by an automatic robot, so it is expected to improve productivity and cut down manpower. And it solves a poor adhesion problem and makes an automotive to be lightweight by optimizing spray process. So, It is a next generation automotive vibration reduction material. In this paper, the chemical process for making the new damping materials is described. And then, the damping properties of the vibration reduction materials are analyzed by modal testing of damping treatment specimens. The new vibration reduction materials have good damping properties than asphalt sheet in the experimental results.

• Transactions of the Korean Society of Automotive Engineers
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• v.23 no.6
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• pp.575-582
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• 2015

The Durability cycle is very important for the success of vehicle testing to evaluate Retarder. The purpose of this study is to develop the durability mode on performance evaluation of retarder. Commercial vehicles are equipped with an auxiliary braking device in order to increase safety. A typical device for retarder depends heavily on imports. Domestic development has now become an urgent task. But, No state has an evaluation method for performance evaluation of the auxiliary braking device. We presented the durability test mode for the performance evaluation of the retarder was verified experimentally.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.36 no.1
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• pp.78-85
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• 2013

Since the basic built-in-test, prognostic health management (PHM) has evolved into more sophisticated and complex systems with advanced warning and failure detection devices. Aerospace and military systems, manufacturing equipment, structural monitoring, automotive electronic systems and telecommunication systems are examples of fields in which PHM has been fully utilized. Nowadays, the automotive electronic system has become more sophisticated and increasingly dependent on accurate sensors and reliable microprocessors to perform vehicle control functions which help to detect faults and to predict the remaining useful life of automotive parts. As the complication of automotive system increases, the need for intelligent PHM becomes more significant. Given enormous potential to be developed lays ahead, this paper presents findings and discussions on the trends of automotive PHM research with the expectation to offer opportunity for further improving the current technologies and methods to be applied into more advanced applications.