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디젤 PHEV의 엔진 연료 소모 및 NOx 배출량 예측 계산 방법에 관한 연구
정재우(Jaewoo Chung),김남호(Namho Kim),이상운(Sangwoon Lee),이범호(Beumho Lee),김덕진(Deokjin Kim) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.3
Since the electrification of the internal combustion engine and the improvement in performance under actual road conditions have become important, it is essential to develop an engine performance prediction technique in the transient operation. Particularly, the prediction of engine performance in a driven vehicle scenario would be the most basic requirement in setting an engine operating strategy, effectively matching it with a driving system, and improving performance by controlling engine operation on an actual road. In the case of diesel engines, both fuel consumption during transient driving and the optimization of NOx performance are highly important technical tasks. In the case of diesel engines, optimization of NOx performance would be quite challenging, as well as fuel consumption during transient driving. Therefore, this paper provided a simple computational concept to simulate the fuel consumption and NOx performance of a diesel engine in a transient operating mode, which was expected to be relatively easy to apply for various purposes. To establish the transient operation calculation method proposed in this study, the differences between the transient operation of the diesel engine gas circulation system and the operational characteristics of the diesel engine’s gas circulation system under the steady state were examined, based on the engine experiment. To simplify the calculation process, it was suggested that the results of the steady state model must be adjusted to that of a transient state. Finally, the results of the comparison between the predicted calculation results of transient fuel consumption and NOx emissions, and the experimental results were presented.
압축기 회전속도를 활용한 압축기 유량율 및 저압 EGR 유량율 산정 방법에 관한 고찰
정재우(Jaewoo Chung),김남호(Namho Kim),이상운(Sangwoon Lee),이범호(Beumho Lee),김덕진(Deokjin Kim) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.3
The precise control of the engine gas circulation system is an important technical task in improving the fuel economy and emission performance of a diesel engine. Moreover, the virtual flow sensor using a turbocharger rotational speed signal can be used for the precise control of complicated boost and EGR control systems. Based on this technical background, this study examined the basic calculation logic of the virtual gas flow rate sensor by using the proposed turbocharger rotation speed, and validated it with test results. Specifically, the estimation method of the intake air flow rate and the EGR flow rate of the HP-EGR engine and the estimation method of the EGR flow rate of each loop in the dual-loop EGR engine were presented. To achieve these, a method to improve the accuracy of the calculation results of the compressor flow rate in the engine was presented, and the results of the comparison between the calculation results and the experimental results were discussed.