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감지 타입에 따른 FCEV용 수소센서의 감지성능 비교 평가
이영복(Youngbok Lee),이대건(Daegun Lee),박태욱(Taewook Park),심광택(Kwangtaek Shim),윤병규(ByoungGyu Yoon) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In the Fuel cell electric vehicle, hydrogen sensors are mandatory to prevent the accident which is caused by hydrogen leakage. It is important for hydrogen sensors to exactly and promptly detect the hydrogen leakage of the FCEV. Thermal conductivity hydrogen sensors and catalytic combustion hydrogen sensors are widely used in automobiles like FCEV and in an industrial field. The goal of this study is to evaluate the sensing performance between a thermal conductivity hydrogen sensor and a catalytic combustion hydrogen sensor. To achieve the goal, sensing performance of those sensors is evaluated in various ambient temperature and hydrogen concentration. The result of this study was that the sensing performance of thermal conductivity hydrogen sensor is reliable in every case. But the sensing performance of catalytic combustion hydrogen sensors is decreased in low temperature conditions.
엔진오일 주입을 통한 SOF가 EGR Cooler Fouling에 미치는 영향에 대한 평가
이영복(Youngbok Lee),송순호(Soonho Song),전광민(Kwang Min Chun),민선기(Sunki Min),정도영(Doyoung Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The cooled HPL EGR system(EGR) is an effective strategy to control NOx emission. However, the high concentration of particulate matter(PM) in diesel exhaust gas causes significant soot deposition on the wall of the EGR cooler and reduces the heat transfer performance of the EGR cooler and the reduction rate of NOx. The deposition of PM tends to be occurred more severly with “heavy wet”, which is more frequently at the LTC(Low Temperature Combustion) engine. The goal of this research is to evaluate the effects of SOF(Soluble Organic Fraction) on deposit characteristics of the EGR cooler. To achieve this goal, surrogate SOFs, the engine oil, was used in this experiment. The result of this work is that the reduction rate of the heat exchanger’s effectiveness more increased with engine oil injection than without engine oil injection. However, the reduction rate of the heat exchanger’s was not increased linearly according to increasing the injection rate of the engine oil. There is an another result of this work that the deposit mass of EGR cooler was increased with engine oil injection, which was increased as the engine oil injection rate was increased.
이영복(Youngbok Lee),최왕진(Wang Jin Choi),박태욱(Tae Wook Park),소병삼(Byung Sam So) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
To control the air fuel ratio of internal combustion engine system, Linear Oxygen Sensor is mostly used in these days. Controlling lambda of exhaust gas is the very important to reduce the emission control and enhance the fuel efficiency. In a gasoline internal combustion engine, TWC (Three Way Catalyst) is widely used to reduce the emission. TWC is operated in lambda 1.0 condition. So, oxygen sensor is important to control the lambda for using TWC in internal combustion engine. However, poisoning worsen the sensor performance. The goal of this paper is to evaluate the effects of the siloxane vapor on the linear oxygen sensor. To achieve the goal, selecting the variables those are main factors to worse the sensor performance. Using these factor, separated variable experiment is carried out. The result of this study is that the most dominant factor to worse the sensor performance is the cycle number of measuring the sensor performance. Increasing the number of measuring the sensor performance causes the decreasing the sensor performance.
Soot Particle이 공기유량센서에 미치는 영향성 평가
이영복(Youngbok Lee),최왕진(Wang Jin Choi),전명건(Myounggun Jeon),박태욱(Tae Wook Park),우성종(Sung Jong Woo),오광철(Kwang Chul Oh) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
To control the air fuel ratio of internal combustion engine system, HFM (Hot Film Air Mass Flowmeter) is mostly used. It is very important to control AF ratio for emission control and fuel efficiency. However, soot particle in the intake air by the diesel vehicles which is old or not to equip DPF system will cause the problem to HFM. The goal of this paper is to evaluate the effects of the soot particle in the intake air on HFM (Hot Film Air Mass Flowmeter). To achieve the goal, 2.0L diesel engine was used to generate the soot and exhaust gas which was surrogate intake air including the soot particle for evaluating the effects of the soot particle on the HFM. The result of this work is that the circular shape of grid which was the part of HFM’s entrance increases the efficiency of flow rate and soot particles, but increasing soot deposit in the sensor element in HFM causes the decreasing the performance of the HFM.