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公开(公告)号：US09261001B2
公开(公告)日：2016-02-16
申请号：US14424144
申请日：2013-12-06
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Arifumi Matsumoto , Toru Kidokoro , Taiga Hagimoto , Kazuya Takaoka , Hirokazu Nishijima , Yuki Terui , Akifumi Uozumi
CPC classification number: F01N3/2066 , B01D53/9404 , B01D53/9495 , B01D2251/2067 , F01N3/035 , F01N3/106 , F01N3/208 , F01N11/00 , F01N2550/02 , F01N2550/03 , F01N2550/05 , F01N2560/021 , F01N2560/026 , F01N2610/02 , F01N2610/1453 , F01N2900/1402 , F01N2900/1602 , F01N2900/1616 , F01N2900/1621 , F01N2900/1622 , F01N2900/1806 , Y02A50/2325 , Y02T10/24 , Y02T10/47
Abstract: In a failure determination system that performs failure determination of an exhaust gas purification apparatus having a NOx selective catalytic reduction catalyst (NOx catalyst) that is disposed in an exhaust passage of an internal combustion engine and uses ammonia as a reducing agent, the failure determination of the exhaust gas purification apparatus is performed by a failure determination unit, based on a detected value of a NOx sensor that detects NOx in exhaust gas. Then, based on an adsorption amount difference at assumed failure that is the difference between an ammonia equilibrium adsorption amount in the NOx catalyst in an equilibrium state of ammonia adsorption, assuming that the exhaust gas purification apparatus is in a predefined failure state, and an actual ammonia adsorption amount in the NOx catalyst, the failure determination itself by the failure determination unit is inhibited or the use of the NOx sensor in the failure determination is restricted. Accordingly, in the failure determination system of exhaust gas purification apparatus having the NOx selective catalytic reduction catalyst, erroneous determinations at the time of failure determination are suppressed, thereby further improving the accuracy of the failure determination.
Abstract translation: 在具有设置在内燃机的排气通路中并使用氨作为还原剂的NOx选择性催化还原催化剂（NOx催化剂）的排气净化装置的故障判定系统中，故障判定系统， 废气净化装置由故障判定部基于检测排气中的NOx的NOx传感器的检测值进行。 然后，假设假设故障时的吸附量差异为氨吸附平衡状态下的NOx催化剂中的氨平衡吸附量之间的差异，假设废气净化装置处于预定的失效状态， NOx催化剂中的氨吸附量，故障判定单元的故障判定本身被抑制，或者在故障判定中使用NOx传感器受到限制。 因此，在具有NOx选择催化还原催化剂的排气净化装置的故障判定系统中，抑制故障判定时的错误判定，进一步提高故障判定的准确性。
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公开(公告)号：US10221746B2
公开(公告)日：2019-03-05
申请号：US14651739
申请日：2013-12-12
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Toru Kidokoro , Arifumi Matsumoto , Kazuya Takaoka , Hirokazu Nishijima , Taiga Hagimoto , Yuki Terui , Akifumi Uozumi
Abstract: The invention provides a technique for more accurately executing failure diagnosis for an exhaust gas control apparatus having both a selective reduction function and a filter function. To this end, a failure diagnosis apparatus according to the invention for the exhaust gas control apparatus having both the selective reduction function and the filter function computes a NOx purification rate pertaining to a case where the exhaust gas control apparatus is normal based on an estimated value of the amount of particulate matter (PM) collected or accumulated in the exhaust gas control apparatus and an estimated value of the NO2 ratio of exhaust gas flowing into the exhaust gas control apparatus, and determines that the exhaust gas control apparatus fails when the difference between the result of the calculation and an actual NOx purification rate exceeds a threshold.
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