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[가솔린엔진부문] 가솔린엔진의 금속면온도 및 냉각수로의 전열 특성에 관한 실험적 연구
오창석(Changseok Oh),유택용(Taekyoung Ryu),신승용(Seungyong Shin),최재권(Jaekwon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In recent applications, map controlled thermostat has been adapted to optimize engine cooling system and vehicle cooling system. First of all, this strategy is focused on improving fuel consumption rate and reducing emissions, especially unburned hydrocarbon. The object can be obtained through controlling engine metal temperature by varying engine coolant temperature with engine load and speed. To achieve this goal, it is necessary to understand the characteristics of engine metal temperature and heat rejection rate to coolant.<br/> From the results of tested engines, it is obvious that fuel consumption rate has more dominant effect on engine metal temperatures than the corresponding engine power does. Also, Re-Nu relation which shows heat rejection rate to coolant in function of air-fuel mixture and engine specifications has been studied. Also, the empirical Re-Nu relation at full loaded engine was developed<br/>
분리냉각시스템을 도입한 신엔진의 연비향상 및 배기저감에 관한 실험적 연구
오창석(Changseok Oh),이재헌(Jaeheon Lee),유택용(Taekyong Ryu),신승용(Seungyong Shin),김우태(Wootae Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
This paper presents a split cooling system for a new inIine 4-cylinder automotive engine. The split cooling system circulates coolant to the cylinder head and cylinder block separately. The coolant flow in cylinder block is controlled by a 2nd Thermostat installed at the outlet of cylinder block. The 2nd thermostat closes when the coolant temperature is low And this makes the coolant flow in cylinder block nearly stagnant thereby reducing the coolant-side heat transfer coelIicient and raising cylinder bore temperature. The 2nd thermostat starts to open when the coolant temperature reaches a specified temperature. The test results on engine dynamometer show improved fuel economy and lower exhaust emission which result ftom the decrease in friction works and cooling loss. Also, several vehicle tests with application of the new engine have been performed Fuel economy improvement of 0.5 ~2.0% yields from different test modes and details are discussed in this paper.
전통냉각과 분리냉각이 엔진 냉각 성능에 미치는 영향에 대한 비교 연구
채동석(Dongsuk Chae),오창석(Changseok Oh),유택용(Taekyong Ryu),신승용(Seungyong Shin),김우태(Wootae Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The present paper gives investigations on the conventional and split cooling types for a new inline 4-cylinder automotive engine currently udder development at Hyundai Motor company. Two types of cooling systems are developed by modifying cylinder head gasket and are optimized to their best extent through the study of flow visualization experiment and CFD analysis. The engine equipped with both cooling types is extensively experimented and analyzed in tenns of engine metaI temperatures, fuel economy, knocking intensity, heat balance, and vehicle cooling performance. The various results lead us to conclusion that the improvement of fuel economy, reduction of engine flow resistance resulting in widened margin of vehicle cooling system design, and other desirable features are primary advantages of split cooling type over conventional one.
차량 전자파 환경에서의 GMLAN 검증 방법에 대한 연구
현종석(Jongseok Hyun),오창석(Changseok Oh),최규철(Kyucheol Choi) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since 1990's, the number of electrical/electronic control modules used for the convenience systems and the safety control systems in road vehicles have increased rapidly. resulting advanced electronic industry. As a result, not only the communication between each module has more complicated but also the data processing speed has been faster ever. Accordingly needs of verification for certainties of the data tranceiving are rising recently. All electrical/electronic systems must be under normal operations in any environment surrounded with electromagnetic interferences in addition that tranceiving data must be prevented causing errors from unwanted signals. These uncertainties of electromagnetic susceptibility can cause serious failures of vehicles such as engine stall. airbag control and any others. Hence it is considered that vehicles should obtain immunity against electromagnetic interferences when they are on development stages. The purpose of this research is to study verification method of GMLAN (CAN protocol) intended to module communication for GM vehicles under electromagnetic interference situation.