研究生: |
陳冠瑋 KUAN-WEI Chen |
---|---|
論文名稱: |
以無跡卡爾曼濾波器實現氧化觸媒/濾煙器後處理系統負載量、排氣濃度 熱動態即時估測 UKF-based Real-time Estimation of the PM Loading, Emission Concentration and Thermal Dynamics in DOC/DPF Aftertreatment Systems |
指導教授: |
姜嘉瑞
Chia-Jui Chiang |
口試委員: |
陳亮光
Liang-kuang Chen 顧詠元 YONG-YUAN GU |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 83 |
中文關鍵詞: | 濾煙器 、無跡卡爾曼濾波器 、質量估測 、再生 |
外文關鍵詞: | filter, Unscented Kalman Filter, mass estimation, regeneration |
相關次數: | 點閱:514 下載:0 |
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有鑿於全球PM 汙染日益嚴重,於工業及汽車領域,廣泛使用濾煙器(Diesel Particulate Filter, DPF) 來減少PM 之汙染,但隨著時間的增長,DPF 內部累積之PM 會越來越多,而造成排氣背壓的影響,因此,為了避免這種狀況發生,必須在固定的時間點內啟動再生控制,使得PM 能隨著溫度瞬間增加而完全燃燒。
為了要預測DPF 之再生,本論文首先建立了氧化觸媒(Diesel Oxidation Catalytic, DOC)、DPF 以及DPF 後端PIPE 之動態模型,藉由輸入排氣溫度、排氣流量、PM 濃度來預測再生及非再生過程之DOC/DPF/PIPE 內部變化,並利用無跡卡爾曼濾波器(Unscented Kalman Filter, UKF) 建構估測器進行DPF 內部累積PM 質量、DOC 溫度、DPF 溫度及DPF 前後端壓差之狀態估測。
透過DPF 內部累積PM 質量及DPF 前後端壓差狀態之估測,決定DPF 系統何時須啟動及停止再生,並利用估測之DPF 溫度及輸入排氣溫度、流量決定再生時氧化觸媒前端所需之燃油噴注率,使DPF 能在最少的燃油使用量下維持在燃燒PM 所需溫度。有效的利用DPF 過濾功能,降低PM 汙染,利用以上再生控制方法將DPF 內部累積之PM 及DPF 壓差控制在合適的範圍,避免過大的背壓對DPF 前端的引擎性能造成影響。
In view of global PM pollution is becoming serious every day, diesel particulate filter (DPF) has been widely used in In industry and vehicle domain to reduce PM pollution. But as the accumulation time goes by, the PM inside DPF will become more and more. Cause the effect of back pressure, therefore we need to start regeneration in fixed time, make the PM can been burned as the temperature increases.
In order to predict regeneration of DPF, first of all, we build diesel oxidation catalytic (DOC), DPF and Pipe dynamic model. Predict variation inside DOC/DPF/PIPE system during accumulation process and regeneration process via input exhaust temperature, exhaust mass flow rate, PM concentration. And use Unscented Kalman Filter (UKF) for estimating temperature of DOC, temperature of DPF, mass of PM, pressure of downstream DPF, pressure difference of DPF.
Via estimation of PM mass, pressure difference of DPF, decide when to start regeneration and when to stop. Utilizing feature of DPF to reduce PM pollution. Using control strategy of regeneration, make the mass of PM inside DPF and pressure difference of DPF in a proper range. To avoid excessive back pressure effect upstream engine performance.
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