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승용 디젤 엔진의 실린더 차이 압력을 이용한 IMEP 추정 및 제어 알고리즘 개발
정재성(Jaesung Chung),오승석(Seungsuk Oh),박인석(Jaesung Chung),선우명호(Myoungho Sunwoo) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.9
이 연구에서는 실린더 압력과 모터링 압력의 차이인 차이 압력(difference pressure)을 이용하여 IMEP 를 추정하는 방법을 제안하고, 추정된 IMEP 를 IMEPdiff 로 정의하였다. IMEPdiff 는 차이 압력이 연소 시작 시점에서 연소 종료 시점까지만 존재하는 압력이라는 사실에 기반하여 이론적인 IMEP 계산식의 연산 구간을 최적화한 것으로 IMEP 와 비교 시 R<SUP>2</SUP> 0.9955 의 높은 선형관계를 보였다. 또한 이론적인 IMEP 계산 방법과 비교하여 21 %의 실린더 압력 데이터 및 31 %의 계산량만으로 IMEP 획득이 가능하여 실시간 제어에 용이하다. IMEPdiff 추정 및 제어 성능은 엔진 실험을 통하여 검증하였으며, IMEPdiff 제어를 통하여 실린더 간 토크 편차 감소를 확인하였다. In this study, we propose a new method for estimating the IMEP using difference pressure, which is the pressure difference between the cylinder pressure and the motoring pressure. The estimated IMEP, denoted as IMEPdiff, optimizes the theoretical IMEP calculation range based on the fact that the difference pressure exists between the start and the end of combustion. IMEPdiff is verified to have a high linear correlation with IMEP with R<SUP>2</SUP> of 0.9955. The proposed method can estimate the IMEP with 21% of the cylinder pressure data and 31% of the calculation effort compared to the theoretical IMEP calculation method, and therefore, it has great potential for realtime implementations. The estimation and control performance of IMEPdiff is validated by engine experiments, and by controlling IMEP<SUP>diff</SUP>, the torque variation between the cylinders was reduced.
디젤 엔진의 엔진 토크 제어를 위한 실시간 IMEP 추정 알고리즘 개발
정재성(Jaesung Chung),오승석(Seungsuk Oh),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The indicated mean effective pressure (IMEP) is an indicator which represents the engine torque directly from the in-cylinder pressure. However, the calculation of IMEP requires a large number of cylinder pressure data acquisition and long computation time. For this reason, an estimation method of IMEP with less number of cylinder pressure data acquisition and computation time is needed for real-time combustion control. In this study, we proposed the IMEP estimation algorithm using difference pressure. The difference pressure data during the expansion stroke is used to estimate the IMEP and defined the estimated IMEP value as IMEPdiff. The proposed IMEPdiff has high linear relationship with the real IMEP regardless of different engine operating conditions. Furthermore, the IMEPdiff method reduces the data acquisition of cylinder pressure by 75% and the computational load by 62% compared to the IMEP method which gives a great potential for the real-time estimation of IMEP.
디젤엔진의 실시간 연소제어를 위한 연소위상검출 알고리즘개발
오승석(Seungsuk Oh),임종석(Jongsuk Lim),정재성(Jaesung Chung),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo),한경찬(Kyungchan Han),유준(Jun Yu),박승일(Seungil Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In diesel engines, even if fuel is injected at identical time, combustion phase varies depending on operating conditions such as temperature, humidity, and fuel properties. Such deviations of combustion phase are directly related harmful emissions and torque performance, therefore the combustion phase needs to be detected and controlled. In this study, we propose a novel combustion detection algorithm, Difference pressure Heat release using dP term (DHdP) to detect combustion phase in real-time. DHdP is derived from the difference pressure between firing pressure and motoring pressure and detects combustion phase. DHdP shows a strong linear relationship with 50% mass fraction burned (MFB50), which is well-known for a combustion phasing indicator, under different operating conditions. Furthermore, DHdP requires fewer cylinder pressure data and lighter calculation load, so that it is suitable for real-time applications.