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허동한(Donghan Hur),정지훈(Jihoon Jung),이정준(Jungjun Lee),김석(Seok Kim),이준규(Joonkyu Lee),이주헌(JooHun Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The advanced method of temperature control by physical model has been developed to achieve more stable temperature control while DPF regeneration mode is active. To apply this new control strategy, the exhaust gas temperature has to be precisely modeled at first On the engine side, the combustion efficiency model was constructed using experimental study so that the unburned fuel in cylinder could be estimated under the various conditions. On the catalyst side, the thermodynamic law helped to calculate the exothermic energy from the unburned fuel. And heat transfer and energy equation determined the temperature behavior at both slice and gas side in the channels of the catalyst. Lastly, temperature loss in the pipe between LNT and DPF was modeled by heat equivalent equation. The model based temperature control can be realized by the reverse of the temperature model. The demanded post fuel quantity was calculated from demanded temperature profile inside the catalyst. The accuracy of the new control method was fully validated in various vehicles which are driven in real road.
Lee, SangMoo,Jung, YeHyun,Kwak, Kisung,Rhee, Joonkyu,Yoo, Jaeun,Youm, Dojun,Kim, Hosup,Ha, Hongsoo,Oh, SangSoo IOP Publishing Ltd 2010 Superconductor science & technology Vol.23 No.4
<P>A simple model for estimating the hysteresis energy loss of coated conductors under a general load line was studied. We took advantage of the characteristic line <I>I</I><SUB>b</SUB>(<I>H</I><SUB>a</SUB>) to determine the major parameters used in this model. The value of <I>I</I><SUB>b</SUB>(<I>H</I><SUB>a</SUB>) was based on the scanning Hall probe measurements (SHP) on a Sm<SUB>1</SUB>Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7 − δ</SUB> coated conductor. During SHP measurement, a magnetic field (<I>H</I><SUB>a</SUB>) and current (<I>I</I><SUB>a</SUB>) were applied simultaneously and were varied along 11 different load lines. From the values of SHP measurements, the current density profiles, <I>J</I>(<I>x</I>, <I>H</I><SUB>a</SUB>, <I>I</I><SUB>a</SUB>), were calculated using a numerical inversion method. We define the quantity <I>I</I><SUB>b</SUB> = ∫ <SUB> − <I>w</I></SUB><SUP><I>w</I></SUP>|<I>J</I>(<I>x</I>, <I>H</I><SUB>a</SUB>, <I>I</I><SUB>a</SUB>)| d<I>x</I> and we calculated <I>I</I><SUB>b</SUB> at many points (<I>H</I><SUB>a</SUB>, <I>I</I><SUB>a</SUB>) in every load line. We found that when <I>I</I><SUB>a</SUB> is less than <I>I</I><SUB>b</SUB> and the flux trap regions are absent, the values of <I>I</I><SUB>b</SUB> for all points (<I>H</I><SUB>a</SUB>, <I>I</I><SUB>a</SUB>) constitute a single line <I>I</I><SUB>b</SUB>(<I>H</I><SUB>a</SUB>), which can be easily extrapolated to a high field. This line provided a major parameter for our model. </P>
Yoo, Jaeun,Lee, SangMoo,Jung, YeHyun,Kwak, Kisung,Rhee, Joonkyu,Youm, Dojun,Kim, Hosup,Ha, Hongsoo,Oh, SangSoo,Oh, Sangjun IOP Publishing Ltd 2009 Superconductor science & technology Vol.22 No.4
<P>The hysteresis loss in a Sm<SUB>1</SUB>Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ</SUB> coated conductor was estimated from magnetic field profiles measured by the scanning Hall probe method. Current, <I>I</I><SUB>a</SUB>, and magnetic field, <I>B</I><SUB>a</SUB>, were applied simultaneously; <I>B</I><SUB>a</SUB> was applied in the normal direction with respect to the tape surface. <I>B</I><SUB>a</SUB> and <I>I</I><SUB>a</SUB> were varied from <I>B</I><SUB>peak</SUB> to −<I>B</I><SUB>peak</SUB> and from <I>I</I><SUB>peak</SUB> to −<I>I</I><SUB>peak</SUB>, respectively, with the ratio α = <I>I</I><SUB>a</SUB>/<I>B</I><SUB>a</SUB> fixed during the variation. Three values of α were taken for the three load lines. The values of <I>B</I><SUB>peak</SUB>/<I>I</I><SUB>peak</SUB> were varied from 0 mT/0 A to 10.7 mT/116 A, 99.1 mT/50 A, and 298.2 mT/46.1 A, respectively, for the three load lines. From the measured values of magnetic field profiles, the current profiles were calculated by the iterative inversion method. From the current profiles, the flux density profiles and the hysteresis loss, <I>Q</I>, were then calculated for various values of <I>I</I><SUB>peak</SUB>(= α<I>B</I><SUB>peak</SUB>) in each load line. The results were compared with theoretical calculations based on Brandt’s model. When <I>B</I><SUB>peak</SUB> was about 300 mT, the estimated values of <I>Q</I> were several times smaller than the theoretical values of <I>Q</I> with the self-field <I>I</I><SUB>c0</SUB>. The low value of <I>Q</I> in this case is due to the field dependent <I>I</I><SUB>c</SUB> and the saturation effect of the current profiles, which results in significant reduction of the induced magnetic moment, <I>M</I>. </P>