Abstract:
In an internal combustion engine system having an exhaust aftertreatment system including a selective catalytic reduction (SCR) catalyst (38), diagnostic methods involve the intrusive perturbation of a target surface coverage parameter theta to determine the state of health of the SCR catalyst (38) or an ammonia concentration sensor (60). An adaptive learning block adapts the target theta based on the use of NH 3 sensing feedback from a mid-brick positioned ammonia concentration sensor (60) to pull in system variation. A further diagnostic monitors the amount of adaptation and when the adaptive learning excessively learns, the diagnostic assumes that some system-level degradation must have occurred and the diagnostic will notify the overall emissions control monitor.
Abstract:
In an internal combustion engine system having an exhaust aftertreatment system including a selective catalytic reduction (SCR) catalyst (38), diagnostic methods involve the intrusive perturbation of a target surface coverage parameter theta to determine the state of health of the SCR catalyst (38) or an ammonia concentration sensor (60). An adaptive learning block adapts the target theta based on the use of NH 3 sensing feedback from a mid-brick positioned ammonia concentration sensor (60) to pull in system variation. A further diagnostic monitors the amount of adaptation and when the adaptive learning excessively learns, the diagnostic assumes that some system-level degradation must have occurred and the diagnostic will notify the overall emissions control monitor.
Abstract:
Disclosed herein is a composition for use in a NOx electrode comprising:
Tb(1-x)Ln(x)E(1-y)Q(y1)X(y2)Z(y3)O3
wherein Ln is a lanthanoid or a combination of lanthanoids, E is a metal selected from chromium, iron, and a combination thereof, Q is an element selected from magnesium, calcium, strontium, and a combination thereof, X is an element selected from boron, lead, phosphorus, germanium, and a combination thereof, Z is an element selected from barium, silicon, aluminum, and a combination thereof, x is from 0 to about 0.5, y is from about 0.05 to about 0.8, and y1, y2, y3 are independently from 0 to about 0.8, with the proviso that y = y1 + y2 + y3, and y2 + y3 is greater than 0. Also disclosed are a method of making it, electrodes and sensors comprising it, and a method of detecting NOx.
Abstract translation:公开在为使用中的NOx电极,其包括组合物:€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ铽(1-x)的LN(x)的E(1-γ)Q(Y 1)X (Y 2)Z(Y 3)O3 worin Ln为镧系元素或镧系元素E的组合选自铬,铁中选择的金属,以及它们的组合,Q是选自镁,钙,锶中的一种元素,以及它们的组合 中,x是选自硼,铅,磷,锗的元素,以及它们的组合,Z是从钡,硅,铝中选择的元素,以及它们的组合,x为0至约0.5,y为约12时05分 至约0.8,和Y1,Y2,Y3是从0unabhängig至约0.8,条件没Y = Y 1 + Y 2 + Y 3,和Y 2 + Y 3为大于0,所以盘游离缺失了制备的方法它,电极和 包括传感器它,以及检测的NOx的方法。