As NOx emissions legislation for Diesel-engines is becoming more stringent than
ever before, an aftertreatment system has been widely used in many countries.
Specifically, to reduce the NOx emissions, a selective catalytic reduction(SCR)
system has become one of the most promising techniques for Diesel-engine vehicle
applications. In the SCR system, input ammonia concentration and ammonia
coverage ratio are regarded as essential states in the control-oriental model.
Currently, an ammonia sensor placed before the SCR Can is a good strategy for
the input ammonia concentration value. However, physical sensor would increase
the SCR system cost and the ammonia coverage ratio information cannot be
directly measured by physical sensor. Aiming to tackle this problem, an observer
based on particle filter(PF) is investigated to estimate the input ammonia
concentration and ammonia coverage ratio. Simulation results through the
experimentally-validated full vehicle simulator cX-Emission show that the
performance of observer based on PF is outstanding, and the estimation error is
very small.

제 1편 : SIMULINK 기본편
1.1 SIMULINK의 시작 1
블록의 연결 5
블록 파라미터의 설정 7
시뮬레이션 파라미터 (Configuration Parameters)의 설정 8
시뮬레이션의 수행 9
블록 파라미터의 표시 9
복수 데이터의 표시 11
2.2 동적 시뮬레이션 13
이차 미분방정식 17
선형 상태변수 모델 23
DC 모터의 시뮬레이션 24
함수 블록의 사용 29
차분방정식(difference equation)의 모델링 34
Subsystem(부시스템)의 구성 37
제 2편 : 연구논문
A particle filter for ammonia coverage ratio and input simultaneous
estimations in Dieselengine SCR system
1. Introduction 41
2. Selective catalytic reduction(SCR) 43
3. Observer design for ammonia input and coverage ratio
estimations 46
4. Simulation results and comparisons 50
5. Conclusion 54
6. References 55