车用发动机
車用髮動機
차용발동궤
2013年
4期
6-10
,共5页
俞妍%邓成林%庞海龙%资新运%卜建国
俞妍%鄧成林%龐海龍%資新運%蔔建國
유연%산성림%방해룡%자신운%복건국
选择性催化还原%控制策略%排放%模型
選擇性催化還原%控製策略%排放%模型
선택성최화환원%공제책략%배방%모형
SCR%control strategy%emission%model
为满足即将实施的中重型柴油车国Ⅳ排放法规要求,建立了一种基于模型的SCR尿素喷射稳态控制策略,研究了稳态下影响尿素喷射的排温模型、NOx 预估模型、排气流量模型、催化器效率模型和喷射模型,分析了空速比等影响模型性能的重要参数,建立了模型控制的MAP图和数学计算方法。将SCR系统进行了台架试验,研究了ESC工况下NOx 浓度变化趋势。研究结果表明,基于模型控制策略的SCR系统对于降低NOx 排放具有良好的效果,并可以达到国Ⅳ排放法规要求。
為滿足即將實施的中重型柴油車國Ⅳ排放法規要求,建立瞭一種基于模型的SCR尿素噴射穩態控製策略,研究瞭穩態下影響尿素噴射的排溫模型、NOx 預估模型、排氣流量模型、催化器效率模型和噴射模型,分析瞭空速比等影響模型性能的重要參數,建立瞭模型控製的MAP圖和數學計算方法。將SCR繫統進行瞭檯架試驗,研究瞭ESC工況下NOx 濃度變化趨勢。研究結果錶明,基于模型控製策略的SCR繫統對于降低NOx 排放具有良好的效果,併可以達到國Ⅳ排放法規要求。
위만족즉장실시적중중형시유차국Ⅳ배방법규요구,건립료일충기우모형적SCR뇨소분사은태공제책략,연구료은태하영향뇨소분사적배온모형、NOx 예고모형、배기류량모형、최화기효솔모형화분사모형,분석료공속비등영향모형성능적중요삼수,건립료모형공제적MAP도화수학계산방법。장SCR계통진행료태가시험,연구료ESC공황하NOx 농도변화추세。연구결과표명,기우모형공제책략적SCR계통대우강저NOx 배방구유량호적효과,병가이체도국Ⅳ배방법규요구。
In order to meet the impending State Ⅳ emission legislation for middle and heavy duty vehicle ,a steady state con-trol strategy of urea injection for SCR based on model was established .The exhaust temperature ,NOx pre-estimation ,exhaust flow ,catalyst efficiency and injection models were researched ,the important parameter affecting model effect like space velocity was analyzed ,and the MAP and mathematic calculation method controlled by model were built .The SCR system was verified in the test bench and the NOx trend in ESC cycle was researched .The results show that the SCR system based on model control strategy has a better effect on reducing NO x emission and can meet the requirement of State Ⅳ .