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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.
[기술논문] 측정기반 최악실행시간 분석 기법을 이용한 AUTOSAR 호환 승용디젤엔진제어기의 실시간 성능 검증에 관한 연구
박인석(Inseok Park),강은환(Eunhwan Kang),정재성(Jaesung Chung),손정원(Jeongwon Sohn),선우명호(Myoungho Sunwoo),이강석(Kangseok Lee),이우택(Wootaik Lee),연제명(Jeamyoung Youn),원동훈(Donghoon Won) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.5
In this study, we presented a timing verification method for a passenger car diesel engine management system (EMS) using measurement-based worst-case execution time (WCET) analysis. In order to cope with AUTOSAR-compliant software architecture, a development process model is proposed. In the process model, a runnable is regarded as a test unit and its temporal behavior (i.e. maximum observed execution time, MOET) is obtained along with on-target functionality evaluation results during online unit test. Furthermore, a cost-effective framework for online unit test is proposed. Because the runtime environment layer and the standard calibration environment are utilized to implement test interface, additional resource consumption of the target processor is minimized. Using the proposed development process model and unit test framework, the MOETs of 86 runnables for diesel EMS are obtained with 213 unit test cases. Using the obtained MOETs of runnables, the WCETs of tasks are estimated and the schedulability is evaluated. From the schedulability analysis results, the problems of the initially designed schedule table is recognized and it is fixed by redesigning of the runnable mapping and task offset. Through the various test scenarios, the proposed method is validated.
승용디젤엔진의 EGR, VGT 시스템을 위한 비선형 정적 모델 기반 피드포워드 제어 알고리즘 설계
박인석(Inseok Park),박영섭(Yeongseop Park),홍승우(Seungwoo Hong),정재성(Jaesung Chung),손정원(Jeongwon Sohn),선우명호(Myoungho Sunwoo) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.6
This paper presents a feedforward control algorithm for the EGR and VGT systems of passenger car diesel engines. The air-to-fuel ratio and boost pressure are selected as control indicators and the positions of EGR valve and VGT vane are used as control inputs of the EGR and VGT controller. In order to compensate the non-linearity and coupled dynamics of the EGR and VGT systems, we have proposed a non-linear model-based feedforward control algorithm which is obtained from static model inversion approach. It is observed that the average modeling errors of the feedforward algorithm is about 2% using stationary engine experiment data of 225 operating conditions. Using a feedback controller including proportional-integral, the modeling error is compensated. Furthermore, it is validated that the proposed feedforward algorithm generates physically acceptable trajectories of the actuator and successfully tracks the desired values through engine experiments.