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公开(公告)号：US11821349B2
公开(公告)日：2023-11-21
申请号：US17276505
申请日：2019-09-09
发明人： Shogo Kawamura , Tomomasa Aikawa , Isao Naito , Hiroki Nihashi , Nobuyuki Takagi , Takeshi Nobukawa
IPC分类号： F01N3/20 , B01J23/46 , B01J27/053 , B01J37/02 , B01J37/08
CPC分类号： F01N3/20 , B01J23/46 , B01J27/053 , B01J37/02 , B01J37/08 , F01N2250/12 , F01N2510/0684
摘要： An exhaust gas purification catalyst including an alkaline-earth metal carried on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purification catalyst has an alkaline-earth metal carrying region including a porous carrier, Pt, and a sulfuric acid salt of at least one alkaline-earth metal carried on the porous carrier, wherein a value of RAe/Pt is 0.5 or more, where RAe/Pt represents the Pearson's correlation coefficient calculated using α and β in each pixel obtained by, for a cross section of the region, performing the area analysis by FE-EPMA under the conditions of: pixel size 0.34 μm×0.34 μm; and number of measured pixels 256×256; and measuring an intensity (α: cps) of a characteristic X ray of an element (Ae) of the alkaline-earth metal and an intensity (β: cps) of a characteristic X ray of Pt for each pixel.
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公开(公告)号：US20180340459A1
公开(公告)日：2018-11-29
申请号：US15952862
申请日：2018-04-13
发明人： Takeshi NOBUKAWA , Tomomasa Aikawa
IPC分类号： F01N11/00
CPC分类号： F01N11/00 , F01N3/0814 , F01N3/0842 , F01N3/10 , F01N2550/02 , F01N2550/03 , F01N2560/026 , F01N2560/06 , F01N2900/04 , F01N2900/1402 , F01N2900/1404 , F01N2900/1411 , F01N2900/1621
摘要： An apparatus for diagnosing deterioration of an NOx storage-reduction catalyst for purifying an exhaust gas discharged from an internal engine, including an intake air amount detection unit for detecting an intake air amount to the internal combustion engine, an exhaust gas temperature detection unit for detecting the temperature of an exhaust gas passing through the NOx storage-reduction catalyst, an NOx purification rate detection unit for detecting NOx in an exhaust gas flowing into the NOx storage-reduction catalyst and in an exhaust gas flowing out of the NOx storage-reduction catalyst, thereby detecting an NOx purification rate, and a diagnostic unit for, when the temperature of the exhaust gas passing through the NOx storage-reduction catalyst increases following an increase in the intake air flow rate to the internal combustion engine and in turn, the temperature of the NOx storage-reduction catalyst greatly increases over a first predetermined threshold value, calculating a difference in the NOx purification rate between before and after the rise of temperature of the NOx storage-reduction catalyst, and diagnosing the NOx storage-reduction catalyst as being deteriorated when the NOx purification rate difference is larger than a second predetermined threshold value.
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公开(公告)号：US10385753B2
公开(公告)日：2019-08-20
申请号：US15952862
申请日：2018-04-13
发明人： Takeshi Nobukawa , Tomomasa Aikawa
摘要： An apparatus for diagnosing deterioration of an NOx storage-reduction catalyst for purifying an exhaust gas discharged from an internal engine, including an intake air amount detection unit for detecting an intake air amount to the internal combustion engine, an exhaust gas temperature detection unit for detecting the temperature of an exhaust gas passing through the NOx storage-reduction catalyst, an NOx purification rate detection unit for detecting NOx in an exhaust gas flowing into the NOx storage-reduction catalyst and in an exhaust gas flowing out of the NOx storage-reduction catalyst, thereby detecting an NOx purification rate, and a diagnostic unit for, when the temperature of the exhaust gas passing through the NOx storage-reduction catalyst increases following an increase in the intake air flow rate to the internal combustion engine and in turn, the temperature of the NOx storage-reduction catalyst greatly increases over a first predetermined threshold value, calculating a difference in the NOx purification rate between before and after the rise of temperature of the NOx storage-reduction catalyst, and diagnosing the NOx storage-reduction catalyst as being deteriorated when the NOx purification rate difference is larger than a second predetermined threshold value.
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