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직접분사식 단기통 디젤엔진에서 다단분사에 따른 연소 및 배기특성
허정윤(Jeong Yun Heo),차준표(Junepyo Cha),윤승현(Seung Hyun Yoon),이창식(Chang Sik Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The purpose of this work is an experimental investigation combustion and emission characteristics in DI diesel engine applied multiple injection strategy. In order to analyze the effect of multiple injection, single-cylinder DI diesel engine was operated under electrically controlled fuel injection system. In this study, multiple injections were injected as two types of multiple injection that were defined as the pilot injection and the post injection. The pilot injection and the post injection was injected 30% of total fuel injections mass quantity. The results of multiple injection were compared to those of single injection and each multiple injection types. To investigate for a low speed engine and middle range load, the experimental conditions were conducted under a fixed engine speed and constant stoichiometric ratio condition. The combustion results show that each multiple injections decreases peak heat release rates but increases indicated mean effective pressure. The emissions results that pilot injection increases emissions but post injection reduces NO<SUB>x</SUB>, HC and CO emissions.
소형디젤기관의 연료분사조건에 따른 연소 및 미세입자 배출 특성에 관한 연구
강석호(Seok-Ho Kang),이성욱(Seang-Wock Lee),엄동섭(Dong-Seop Eom) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.7
Emission standards for passenger diesel engines are becoming more and more stringent. Especially, Europe started the regulation of nano-particles from 2011 with EURO 5b. The objective of this study is to investigate the effect of fuel injection strategy on combustion and nano-particle emission in a small diesel engine. In this study, we conducted combustion analysis and measured both the weight of PM and number of nano-particels. At first, the optimum injection timing was determined with fixed engine operating conditions, such as engine speed, load, and fuel injection quantity. After that, the injection timing was controlled, and the effect of pilot injection was investigated. The number of nano-particles increased as engine load decreases, and it increased up to 10 times depending on the change of injection timing. The weight of PM emissions was increased at low load, and the PM emissions increased with increasing the number of pilot injections.
소형 디젤엔진에서 분사전략이 나노입자 배출 특성에 미치는 영향
엄동섭(Dong-Seop Eom),김민석(Min-Seok Kim),박진혁(Jin-Hyuk Park),권상일(Sang-Il Kwon),이성욱(Seang-Wook Lee),조용석(Yong-Seok Cho),백두성(Doo-Sung Baik) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This research aims to investigate the characteristics of regulated emissions such as particulate materials and vehicle performance by variations of injection strategy and control of air quantity affecting on combustion conditions in a compact diesel engine. In this experiment a 3.0 liter high speed diesel engine is used equipped with CRDI fuel injection system where the injection pressure is 160㎫ and E-VGT is applied. In order to investigate exhaust emissions and variations of power due to injection strategy, main and pilot injection are changed and compared with their engine performance and amounts of emissions which are obtained by a conventional ECU. From the results, the characteristics of torque tend to decrease when the number of injection times increases but the torque increases as air fuel ratio increases, but the torque decreases due to increased back pressure specially in lower engine loads. The nano-particle is not affected by the variation of air-fuel ratio but the amount increase as the number of pilot injection time increases and engine load is lower, and similar emission characteristics are shown both in ranges of low and high speeds. PM emission emitted more in lower engine speed or higher load, and pilot injection gives disadvantage on PM emission since PM increase when the number of pilot injection time increases, but the reduction effect is appeared apparently due to the increase of air quantity. NOX emission increases in accordance with increasing air-fuel ratio in overall ranges but the reduction rate is very effective by pilot injection.
바이오 디젤엔진의 다단분사 적용시 엔진 성능 및 배출가스 특성에 관한 연구
김형술(Hyung-Sul Kim),이강복(Gang-Bok Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.3
This paper described the effect of multiple injections on the engine performance and emission characteristics in a CRDI diesel engine using Bio diesel blended diesel fuel. In order to investigate the influence of multiple injections in a DI diesel engine, the injection timing was changed the main injection and pilot injection timings. The experimental apparatus consisted of DI diesel engine with four cylinders, multi-stage injection control system and exhaust emissions analyzer. The combustion and emission characteristics were analyzed for the main and pilot-main injection strategies. The combustion characteristics results show that the combustion pressure was smoothly near the top dead center due to the effect of pilot injection. Also, NOX emissions are decreased with pilot injection because the decrease of rate of heat release. However, the soot is increased at early pilot injection and main injection.
신문주(Munju Shin),표영덕(Youngdug Pyo),박정권(Jungkwon Park),정수진(Soojin Jeong),이충원(Choongwon Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A study of power and emission in a CRDI diesel engine by using Dimethyl ether(DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meet the ULEV emission regulation and reduce the smoke to almost zero when used in a diesel engine. Also, Test results showed that the torque and power and brake thermal efficiency with DME were same as those of pure diesel oil, The test results showed that DOC was the vary effective method to reduce the CO emission in case of Dimethyl ehter fuelin diesel engine. but, THC emission is showed a little reduction rates than CO reduction rates.also EGR system was the very effective method to reduce the NOx emission in case of DME fuel in diesel engine.
Design and Implementation of Knocking Diagnosis Simulator using DAQ board in CRDI Engine ECU
Sung-Jin Jang,Hwa-Seon Kim,Jong-Wook Jang 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
According to the eco-friendly requirements both domestic and abroad for the recently produced car productions, engine technology should be applied to reduce the harmful exhaust gas of cars. In order to meet the recently enhanced emission standards at home and abroad, it is necessary to develop the CRDI ECU control algorithm that users can adjust fuel injection timing and amount in response to their needs. as required by users, Emulator, which is possible to change the timing and amount of the injection fuel and is exclusively used for only CRDI diesel engine, is developed and expected to apply to the research of engine performance improvement and exhaust gas reduction in the near future. Therefore, this study developed the simulator by realizing the knocking diagnostic algorithm that enables knocking discrimination and engine balance correction applicable to the ECU exclusive to the common rail engine. The development of the simulator has enabled to adjust fuel injection timing and amount. Thus, this study aims to improve engine efficiency and to reduce emissions.
박용성(Yongsung Park),김남용(Namyong Kim),최동석(Dong-Seok Choi),곽민환(Minhwan Kark),용부중(Boojoong Yong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study shows the emission of the CRDI Diesel engine. NOx reduction efficiency of the EGR system is over 30~40% for NEDC test area. CO and HC conversion efficiency is over 98% and 81% by Diesel Oxidation Catalysts(CCC & UCC)
직접분사식 압축착화 디젤엔진의 분사시기 변화에 따른 연소 및 성능특성에 관한 연구
김기복(Gi-Bok Kim),김치원(Chi-Won Kim),윤창식(Chang-Sik Yoon) 한국산업융합학회 2016 한국산업융합학회 논문집 Vol.19 No.1
Since the oil shock of 1970′s there was a strong upward tendency for the use of the high viscosity and poorer quality fuels. Therefore the misfiring engine occurs due to the decrease of quantity injected for lean burn and emission control in Compression Ignition Common Rail Direct Injection diesel engine. In this study, it is designed and used the test bed which is installed with fuel injector controller. In addition to equipped engine using CRDI by controlling the injection timing with mapping modulator, it has tested and analyzed the engine performance and combustion characteristics, as it is varied that they are the operating parameters: fuel injected quantity, engine speed and injection timing.
커먼레일 디젤기관에서 분사전략에 따른 성능 및 배출가스에 관한 연구
엄동섭 ( Dong Seop Eom ),고동균 ( Dong Kyun Ko ),나완용 ( Wan Yong Ra ),이성욱 ( Seang Wock Lee ) 한국액체미립화학회 2011 한국액체미립화학회지 Vol.16 No.3
Recent research has focused on engine combustion technology as well as application of after-treatment in order to comply with emission regulation. However, it is much more efficient way to control emissions from engine itself and furthermore research on engine control will provide the direction of after-treatment technology in future. Furthermore, emission standard regulation for passenger diesel vehicles has been stringent compared to others and nano-particles will be included in EURO6 regulation in Europe and similar emission standard will be introduced in Korea. A 3.0 liter high speed diesel engine equipped with by CRDI system of 160MPa injection pressure, and an intake/exhaust system of V type 6 cylinder turbo-intercooler was applied. The injection duration and injection quantity, pilot injection types which are related to CRDI and air/fuel ratio control applied by EVGT were changed simultaneously. Standard experiment procedure constituted dilution apparatus and CPC system to collect nano-particles and these test results were compared with regulated materials of CO, HC, NOx and investigated their relations and characteristics of nano-particles.
소형 트랙터용 전자제어 직접 분사식 디젤 엔진 고강도 실린더 블록의 설계에 관한 연구
남석주,박성호,김규태,김귀남 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.4
Recently, global warming has become severe, and regulation is established for carbon savings each field. its regulation is applied to various fields using IC engine such as automobile, ship, agricultural machine. Therefore engine block applied Common Rail Direct Injection(CRDI) technology, that carry out thermal-structure analysis to examine design. The thermal load about 900℃ by explosion was applied in cylinder. And pressure about 9 MPa(90 Bar) was applied to structure analysis. As a result, it was the highest at 185.99℃ at the top of cylinder. Static-structure analysis applied thermal load, that was shown maximum equivalent stress at 142.59 Mpa and Maximum principal stress 145.03 MPa, Minimum principal stress –149 MPa. When compare analysis results to material property, it design is safety structurally.