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고속응답 CO₂ 분석기의 제작 및 이를 이용한 SI 엔진에서의 실시간 배기가스 분석에 관한 연구
송현수(Hyunsoo Song),박경석(Kyoungseok Park),박동선(Dong Sun Park),민경덕(Kyoungdoug Min) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.2
A fast-response CO₂ analyzer has been developed for measuring the CO₂ concentration during transient condition of a SI engine. The analyzer consists of the non-dispersive infrared absorption method, electrical chopping system and water cooling system. The analyzer has good repeatability, linearity and permissible drift characteristic. Besides, it showed 18㎳ of a response to measure the CO₂ concentration. The fastresponse CO₂ analyzer was applied to a single cylinder SI engine and the CO₂ emission was examined during engine start. Simultaneously, the standard exhaust gas analyzer, which has slow response time, was used for confirming the accuracy of the exhaust gas analysis using the fast-response CO₂ analyzer. The developed analyzer showed much faster responsive characteristic than that of a standard analyzer and made cycle by cycle exhaust gas analysis possible. The transient engine operating characteristics will be estimated from the CO₂ concentration of engine-out emissions and engine operating variables.
김기복(Kibok Kim),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park),김우석(Wooseok Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
A shift pattern is a very important factor on a vehicle fuel economy. Especially for manual transmission vehicles, a fuel economy varies according to a driver's tendency. If an indicator put a driver on notice of gear shift on pertinent point of time, the fuel economy can be improved. This paper focuses on fuel economy improvement through change of gear shifting engine speed and presents a gear shift algorithm considering a traction force, an APS, a vehicle acceleration and a BSFC(Brake Specific Fuel Consumption). The bigger portion of high gear stage is, the better the engine efficiency and lower total cycle there will be. So the fuel economy of the vehicle becomes better. The specification of test vehicle is 6000㏄ diesel engines and the test condition is two cases, shift on high engine speed and shift on low engine speed. In the case of real experiment on the road, when the shift the gears at the normal condition, it was showed a preponderance of 25% at the shift on low engine speed in the average of twice experiments but the result of only 9% at the shift on high engine speed. That is, the lower engine speed is, the better fuel economy is presented. There are similar result at the simulation. However, if the engine speed is low in a gear shift, the vehicle can not be sufficient traction force. So, vehicle speed will be low or the section that can not follow required vehicle speed is occurred. In order to improve these problems, presented a gear shift algorithms that is considering a traction force. Our team got a shift profile to algorithm and applied it to the simulation. As a result, 13.7% of vehicle fuel economy improvement can be achieved comparing to normal condition.