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RISS 인기검색어
- 검색키워드
- 저자 : C. Purushothama (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Power Flow Management in Hybrid Electric Vehicles
C. Purushothama,Xinhong Chen,Le Duc Chien,Jae Ou Chae,Bong Soo Kim 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid electrical vehicles are very popular due to their extended operating range, reduced emission, improved fuel economy and rapid refueling. They are powered by an internal combustion engine and an electrical motor which driven by a battery. Battery is charged either by the engine or by ‘regenerative’ braking, which otherwise dissipated in the form of heat to the atmosphere. In order to realize the best use of hybrid vehicles, an optimal power distribution between the engine and battery is required. In this paper dynamic programming technique and rule-based control methods are discussed to develop a power controller which would control the power distribution. Dynamic programming technique cannot be applied for real time applications due to their preview nature and computational complexity. But it is suggested that it can be used to improve efficiency of rule-based control method.
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Comparative Studies on Soot Oxidation by Nitrogen Dioxide and Ozone
C. Purushothama,Xin-hong Chen,Ming wei Li,Jae-ou Chae,Ju-hyen Sim 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Non-thermal plasma technology has many applications in various areas. One of the applications is regenerating diesel particulate filter (DPF). DPF is a widely applied device to control the particulate emission of diesel engines. But it needs periodic removal of clogged soot for the smooth running of engine. Conventional high-temperature removal processes easily leads to the breakage of DPF. Herein, low-temperature plasma formed in a dielectric barrier discharge (DBD) reactor was used to form active oxidants such as ozone and nitrogen dioxide. Experimentally, the effects of discharge power and frequency on the performance of DBD reactor were studied. Two oxidants, O₃ and NO₂, were synthesized and used for incinerating soot in the used DPF. Performances of the two oxidants on the reduction of soot were compared, and it was found that NO₂ is more effective than O₃ for getting rid of soot
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Effective replacement carburetor by compact Port Fuel Injection system in small motorcycle engine
Le Duc Chien,C. Purushothama,Chen Xinhong,Sim Ju Hyuen,Woohyung Kim,Chae Jae Ou 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Port Fuel Injection (PFI) was developed in 80s for automotive industry in order to improve engine performance and control effectively emission. It is now used widely in modem cars and some kinds of sport motorcycle. To take advantage of electronic, the premix of air-fuel and combustion process can be programmed and controlled very precisely. Therefore, emission and performance of engine can be improved significantly regarding to different working conditions. One of the main reason of PFI technology that makes it not popular on motorcycle is its complexity and high cost. This paper reports our recent efforts to develop a new and compact PFI system that can replace the in-used carburetor easily with less extra modification. The mixing process, included fuel injection timing, throttle shape design and parameters of ignition were all investigated. We minimized the number of sensors, built a new function to determine the crankshaft position therefore avoid to modify flywheel as previous experiments.
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Ozone Synthesis and Regeneration of DPF using Dielectric Barrier Discharges
Xin-hong Chen,C. Purushothama,Jae-ou Chae,Yonghwan Kwak 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Non-thermal plasma technology has many applications in various areas. One of the applications is regenerating diesel particulate filter (DPF). DPF is a widely applied device to control the particulate emission of diesel engines. However, clogging of the DPF occurs after hours of operation resulting in reduced engine efficiency. In order to solve this problem carbon soot collected inside the DPF should be cleaned out periodically. Conventional high-temperature removal processes easily leads to the breakage of DPF. Herein, low-temperature plasma formed in a dielectric-barrier discharge(DBD) reactor was used to form active oxidants such as ozone and monatomic oxygen. Two types of plasma reactors: surface DBD and volume DBD were studied. Experimentally, the effects of discharge power and frequency on the performance of DBD reactors were studied. It has found that design of surface DBD used in this study is much more efficient than volume DBD. Regeneration of the DPF was carried out with oxygen flow rate 3.5 L/min; with applied discharge power 19 W using volume DBD. It could remove 2.1g of carbon soot after a continuous regeneration for 2.5 hrs.
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Regeneration of Diesel Particulate Filter (DPF) using Ozone
Jae-ou Chae(채재우),Xin-hong Chen(진신홍),C. Purushothama(푸루소타마),Rui-qiang Liu(류서강),Ming-wei Li(이명위) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recent years, automotive diesel engine emission standards become very strict, and it is hard to fulfill them just by using the current techniques of improving combustion. Therefore, the ceramic diesel particulate filter (DPF) is widely used for collecting soot from the exhaust gas of diesel engine. However, the DPF need being regenerated after the soot accumulation. This research deals with regeneration of the DPF using ozone, which comes from surface discharge occurred in a dielectric barrier discharge reactor. Pure oxygen was introduced into the reactor, and was discharged to form much activated species, including ozone and monatomic oxygen. When pure oxygen of 4 L/min at a temperature of 443 K is passed to the DPF through plasma reactor which is energized by 100 W for two hours, it has found a decrease in weight of soot by 2 grams. Comparing with the regenerating method via NO₂, the method using ozone is much friendlier to the environment, because ozone is very unstable.
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