Dynamic Modeling of a DOC-DPF Aftertreatment System forRegeneration Control Development
| Autor: | Sheng-Jie Cheng, 程聖傑 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 The main function of Diesel Particulate Filter(DPF) is to remove the par- ticulate matter(PM) from Diesel engine. The accumulated particulate, however,restricts the exhaust flow through the DPF and increases the back pressure which may negatively impact fuel economy. Therefore, the particulate filter needs to be regenerated by burning off the accumulated particulate, which is achieved either passively through the use of a catalyst or by actively introducing high heat into the exhaust system. In the exhaust aftertreatment system considered in this thesis, a diesel oxidation catalyst (DOC) is installed upstream of the DPF to facilitate the regeneration process. In order to combust the captured particulate in the DPF,a small amount of fuel can be injected into the exhaust ahead of the DOC when necessary. In an effort to develop model-based control strategies that completes the regeneration while satisfies the constants such as fuel consumption, temperature and regeneration period, a physics-based dynamic model of the DOC-DPF exhaust aftertreatment system is proposed in this thesis. Parameters in the model including the heat transfer coefficient, reaction constants in the DOC and DPF,and the permeability of the filter and soot are identified based on the experimental measurements. The DOC-DPF model is then validated both at steady state and during transient against experimental data measured at various engine operating conditions, PM loads and fuel injection rates. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|