公开(公告)号：US20150328586A1

公开(公告)日：2015-11-19

申请号：US14808124

申请日：2015-07-24

申请人： Cummins IP, Inc.

发明人： Fan Zeng ,  C. Larry Bruner ,  Edmund P. Hodzen ,  Ian A. Package ,  Shankar Kumar ,  Krishna Kamasamudram

IPC分类号： B01D53/94 ,  G01N33/00

CPC分类号： B01D53/9495 ,  B01D53/9404 ,  F01N3/2066 ,  F01N9/00 ,  F01N2560/021 ,  F01N2610/1493 ,  F01N2900/1616 ,  F01N2900/1806 ,  G01N33/0054 ,  Y02A50/246 ,  Y02T10/24 ,  Y02T10/47 ,  Y10T436/12

摘要： A method and system for mitigating a urea deposit within an SCR system that includes determining a mass of an accumulated urea deposit present within the SCR catalyst and SCR piping, comparing the mass of the accumulated urea deposit with a deposit upper threshold limit, and initiating an SCR regeneration event when the mass of the accumulated urea deposit is greater than the deposit upper threshold limit. The method further includes determining an amount of NH3 passing through the SCR catalyst downstream of the urea deposit, comparing the amount of NH3 passing through the SCR catalyst with an NH3 regeneration threshold limit, and terminating the SCR regeneration event when the level of NH3 passing through the SCR catalyst is less than the SCR NH3 regeneration threshold.

摘要翻译： 一种用于减轻SCR系统内的尿素沉积物的方法和系统，其包括确定存在于SCR催化剂和SCR管道内的累积尿素沉积物的质量，将累积的尿素沉积物的质量与沉积物上限阈值进行比较，以及引发 当累积尿素沉积物的质量大于沉积物上限阈值时，SCR再生事件。 该方法还包括确定通过尿素沉积物下游的SCR催化剂的NH 3的量，将通过SCR催化剂的NH 3的量与NH 3再生阈限进行比较，并且当NH 3通过的水平通过时终止SCR再生事件 SCR催化剂小于SCR NH3再生阈值。

公开(公告)号：US20150275733A1

公开(公告)日：2015-10-01

申请号：US14424144

申请日：2013-12-06

申请人： Arifumi MATSUMOTO ,  Toru KIDOKORO ,  Taiga HAGIMOTO ,  Kazuya TAKAOKA ,  Hirokazu NISHIJIMA ,  Yuki TERUI ,  Akifumi UOZUMI

发明人： Arifumi Matsumoto ,  Toru Kidokoro ,  Taiga Hagimoto ,  Kazuya Takaoka ,  Hirokazu Nishijima ,  Yuki Terui ,  Akifumi Uozumi

IPC分类号： F01N3/20 ,  F01N11/00

CPC分类号： 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

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20150151251A1

公开(公告)日：2015-06-04

申请号：US14388373

申请日：2012-03-29

申请人： Bruno Gaudin

发明人： Bruno Gaudin

IPC分类号： B01D53/94 ,  G01N33/00

CPC分类号： B01D53/9495 ,  B01D53/9431 ,  B01D2251/2062 ,  B01D2255/80 ,  B01D2257/404 ,  F01N3/106 ,  F01N3/208 ,  F01N9/00 ,  F01N11/00 ,  F01N13/009 ,  F01N2430/00 ,  F01N2550/02 ,  F01N2560/021 ,  F01N2560/026 ,  F01N2560/14 ,  F01N2900/0418 ,  F01N2900/1402 ,  F01N2900/1614 ,  F01N2900/1616 ,  G01N33/0037 ,  G01N33/0067 ,  Y02A50/245 ,  Y02T10/24 ,  Y02T10/47 ,  Y10T436/175383

摘要： A method for diagnosing a selective catalytic reduction (SCR) catalyst of an exhaust aftertreatment system of an internal combustion engine includes ensuring that a SCR catalyst NH3 storage level is substantially below the current maximal NH3 storage capacity of the SCR catalyst, initiating over-injection of reductant by the injector, stopping reductant injection upon registering, by the exhaust gas sensor, an increasing NOx+NH3 emission level and an NOx+NH3 emission level exceeding a predefined threshold value, and when the reduction injection is stopped recording an output signal of the exhaust gas sensor until an indication of a minimal or negligible SCR catalyst NH3 storage level is determined, and calculating a SCR catalyst NH3 storage capacity on the basis of the recorded output signal.

摘要翻译： 用于诊断内燃机排气后处理系统的选择性催化还原（SCR）催化剂的方法包括确保SCR催化剂NH 3储存水平显着低于SCR催化剂的当前最大NH 3储存容量，引发过注射 通过喷射器停止还原剂喷射，通过排气传感器停止增加的NOx + NH 3排放水平和超过预定阈值的NOx + NH 3排放水平，并且当还原喷射停止时，记录下 废气传感器，直到确定SCR催化剂NH 3储存水平的最小或可忽略的指示，并且基于记录的输出信号计算SCR催化剂NH 3储存容量。

公开(公告)号：US09038370B2

公开(公告)日：2015-05-26

申请号：US12992741

申请日：2009-09-04

申请人： Alexander Massner

发明人： Alexander Massner

IPC分类号： F01N3/00 ,  F01N11/00 ,  F01N3/10 ,  F01N3/20 ,  F01N13/00 ,  F01N3/021

CPC分类号： F01N11/00 ,  F01N3/021 ,  F01N3/106 ,  F01N3/2066 ,  F01N3/208 ,  F01N13/009 ,  F01N2430/085 ,  F01N2550/02 ,  F01N2560/021 ,  F01N2560/023 ,  F01N2560/025 ,  F01N2560/026 ,  F01N2560/06 ,  F01N2560/08 ,  F01N2560/14 ,  F01N2610/02 ,  F01N2610/03 ,  Y02A50/2325 ,  Y02T10/24 ,  Y02T10/47

摘要： A method for operating an exhaust emission control system of a motor vehicle internal combustion engine, in the exhaust gas line of which an oxidation-catalytically active exhaust emission control component is arranged upstream of a SCR-catalyst is provided. An ageing state of the oxidation-catalytically active exhaust emission control component is determined by correlating a hydrocarbon fraction present in the exhaust emission upstream of the oxidation-catalytically active exhaust emission component with a simultaneous nitrogen oxide conversion of the SCR-catalyst.

摘要翻译： 提供了一种在排气管线中操作机动车辆内燃机的废气排放控制系统的方法，其排气管线中的氧化催化活性废气排放控制部件设置在SCR催化剂的上游。 氧化催化活性废气排放控制组分的老化状态是通过将存在于氧化催化活性废气排放组分上游的废气排放中的烃馏分与SCR-催化剂的同时氮氧化物转化相关联来确定的。

公开(公告)号：US09010087B1

公开(公告)日：2015-04-21

申请号：US14079475

申请日：2013-11-13

申请人： Ford Global Technologies, LLC

发明人： Devesh Upadhyay ,  In Kwang Yoo ,  Michiel J. Van Nieuwstadt ,  David John Kubinski

IPC分类号： F01N11/00 ,  F01N3/18 ,  F01N3/20

CPC分类号： F01N3/18 ,  F01N3/206 ,  F01N3/208 ,  F01N11/00 ,  F01N2550/05 ,  F01N2560/021 ,  F01N2560/026 ,  F01N2610/146 ,  F01N2900/0416 ,  F01N2900/1404 ,  F02D41/042 ,  F02D41/1461 ,  F02D41/222 ,  F02D2041/1469 ,  Y02A50/2325 ,  Y02T10/24 ,  Y02T10/40

摘要： Various systems and method for detecting exhaust NOx sensor degradation are disclosed. In one example, degradation of the NOx sensor is indicated responsive to reductant injection in an exhaust passage under engine off conditions. For example, degradation of the NOx sensor is indicated when an actual NOx sensor output differs from an expected NOx sensor output by more than a threshold amount.

摘要翻译： 公开了用于检测排气NOx传感器劣化的各种系统和方法。 在一个示例中，响应于在发动机关闭条件下的排气通道中的还原剂喷射来指示NOx传感器的劣化。 例如，当实际NOx传感器输出与期望的NOx传感器输出不同超过阈值时，指示NOx传感器的劣化。

公开(公告)号：US08943798B2

公开(公告)日：2015-02-03

申请号：US13650967

申请日：2012-10-12

申请人： Ford Global Technologies, LLC

发明人： Chris Riffle ,  Frank M. Korpics ,  Michiel J. Van Nieuwstadt ,  Devesh Upadhyay ,  John Paul Bogema ,  Jeff Reich

IPC分类号： F01N3/00 ,  F01N3/10 ,  F02M25/03 ,  F01N3/20 ,  F02M25/07 ,  F01N11/00

CPC分类号： F01N3/208 ,  F01N3/2066 ,  F01N11/00 ,  F01N2560/021 ,  F01N2560/026 ,  F01N2900/1616 ,  F01N2900/1812 ,  F02D21/08 ,  F02D41/0052 ,  F02D41/0235 ,  F02D41/146 ,  F02D2041/1468 ,  F02M26/15 ,  F02M26/46 ,  F02M26/47 ,  Y02T10/24 ,  Y02T10/47

摘要： Various systems and methods are described for detecting ammonia slip. In one example method, an amount of exhaust gas recirculation is reduced when output from an exhaust gas sensor indicates an increase in nitrogen oxide above a threshold amount. When the sensor output increases above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to nitrogen oxide; and when the sensor output does not increase above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to ammonia.

摘要翻译： 描述了用于检测氨滑移的各种系统和方法。 在一个示例性方法中，当排气传感器的输出指示高于阈值量的氮氧化物增加时，排气量再循环量减少。 当废气再循环减少时，当传感器输出增加到第二阈值以上时，将传感器输出分配给氮氧化物; 并且当废气再循环减少时传感器输出不增加到高于第二阈值时，传感器输出被分配给氨。

公开(公告)号：US08875490B2

公开(公告)日：2014-11-04

申请号：US13424220

申请日：2012-03-19

申请人： Mert Geveci ,  Andrew Osburn

发明人： Mert Geveci ,  Andrew Osburn

IPC分类号： F01N3/00 ,  F01N3/10 ,  F01N3/20 ,  F01N13/00

CPC分类号： F01N3/208 ,  F01N3/2066 ,  F01N13/0093 ,  F01N2560/021 ,  F01N2560/026 ,  F01N2900/1402 ,  F01N2900/1411 ,  F01N2900/1602 ,  F01N2900/1616 ,  F01N2900/1621 ,  Y02T10/24

摘要： A method includes determining a current mid-bed NH3 amount by operating an NH3 sensor positioned at a mid-bed location for an engine aftertreatment system having two SCR catalyst beds. The method further includes operating a NOx sensor positioned at the mid-bed location, and interpreting a current mid-bed ammonia to NOx ratio (ANR) and a current mid-bed NOx in response to the mid-bed NH3 amount and the operating the NOx sensor. The method further includes correcting an output value of the NOx sensor for cross-sensitivity to NH3. The method includes determining a mid-bed ANR constraint, determining a feedforward mid-bed NOx target, and providing a reductant injector command in response to the current mid-bed ANR, the current mid-bed NOx, the ANR constraint, and the feedforward mid-bed NOx target.

摘要翻译： 一种方法包括通过操作位于中间位置处的NH 3传感器来确定具有两个SCR催化剂床的发动机后处理系统来确定当前的中床NH 3量。 该方法还包括操作位于中间位置的NOx传感器，并且响应于中间床NH 3量解释当前的中床氨与NOx的比（ANR）和当前的中床NOx，并且操作 NOx传感器。 该方法还包括校正NOx传感器的输出值以对NH3的交叉敏感度。 该方法包括确定中床ANR约束，确定前馈中床NOx目标，以及响应于当前中床ANR，当前中床NOx，ANR约束和前馈，提供还原剂喷射器命令 中层NOx目标。

公开(公告)号：US08769928B2

公开(公告)日：2014-07-08

申请号：US12891264

申请日：2010-09-27

申请人： Mary L. Yeager ,  Christopher L. Wynkoop ,  Amit Jayachandran

发明人： Mary L. Yeager ,  Christopher L. Wynkoop ,  Amit Jayachandran

IPC分类号： F01N3/20

CPC分类号： F01N3/208 ,  F01N3/106 ,  F01N13/009 ,  F01N2560/02 ,  F01N2560/021 ,  F01N2560/06 ,  F01N2560/07 ,  F01N2610/02 ,  F02D41/1463 ,  F02D2041/1468 ,  F02D2250/14 ,  Y02T10/24

摘要： An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passage, a reduction catalyst disposed within the exhaust passage, and an injection device configured to inject reductant into the exhaust passage. The exhaust system may also have a sensor configured to generate a signal indicative of a concentration of an exhaust constituent and the reductant, and a controller in communication with the sensor and the injection device. The controller may be configured to make a comparison of a value indicative of a rate of change of the signal for a period of time with a threshold amount, and make a determination of whether the sensor is sensing a concentration of the exhaust constituent or the reductant based on the comparison. The controller may also be configured to adjust operation of the injection device based on the determination.

摘要翻译： 公开了一种用于内燃机的排气系统。 排气系统可以具有排气通道，设置在排气通道内的还原催化剂，以及配置成将还原剂注入排气通道的注入装置。 排气系统还可以具有被配置为产生指示排气组分和还原剂的浓度的信号的传感器，以及与传感器和注射装置连通的控制器。 控制器可以被配置为将指示一段时间内的信号的变化率的值与阈值进行比较，并且确定传感器是否感测排气成分或还原剂的浓度 基于比较。 控制器还可以被配置为基于该确定来调整注射装置的操作。

公开(公告)号：US08671665B2

公开(公告)日：2014-03-18

申请号：US13005398

申请日：2011-01-12

申请人： Yuji Yasui

发明人： Yuji Yasui

IPC分类号： F01N11/00 ,  F01N3/18

CPC分类号： F02D41/0295 ,  F01N3/208 ,  F01N13/008 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N2560/021 ,  F01N2560/025 ,  F01N2570/14 ,  F01N2610/02 ,  F01N2610/06 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D41/0275 ,  F02D41/1441 ,  F02D41/1475 ,  F02D2041/1468 ,  Y02A50/2344 ,  Y02T10/24

摘要： An exhaust gas purifying apparatus for an internal combustion engine is provided. The apparatus includes a first catalyst and a second catalyst. The first catalyst is provided in an exhaust passage of the engine, and can remove NOx in exhaust gases from the engine when an air-fuel ratio of an air-fuel mixture burning in the engine is in the vicinity of the stoichiometric ratio. The second catalyst is provided downstream of the first catalyst, an can remove NOx in the exhaust gases using a reducing agent. An execution condition of a lean operation in which the air-fuel ratio is set to a lean air-fuel ratio which is leaner than the stoichiometric ratio, is determined. When switching the air-fuel ratio from an air-fuel ratio in the vicinity of the stoichiometric ratio to the lean air-fuel ratio, the air-fuel ratio is controlled to a rich air-fuel ratio which is richer than the stoichiometric ratio, during a lean transition period from the time the execution condition is satisfied. The air-fuel ratio is controlled to the lean air-fuel ratio after the lean transition period has elapsed.

摘要翻译： 提供一种用于内燃机的废气净化装置。 该装置包括第一催化剂和第二催化剂。 第一催化剂设置在发动机的排气通道中，并且当在发动机中燃烧的空气燃料混合物的空燃比在化学计量比附近时，能够从发动机排出废气中的NOx。 第二催化剂设置在第一催化剂的下游，可以使用还原剂除去废气中的NOx。 确定将空燃比设定为比化学计量比稀的稀空燃比的稀薄运转的执行条件。 当将空燃比从化学计量比附近的空燃比转换为稀空燃比时，将空燃比控制为比化学计量比更浓的浓空燃比， 在执行条件满足时的精简过渡期间。 经过稀薄过渡期之后，将空燃比控制在稀空燃比。

公开(公告)号：US08555623B2

公开(公告)日：2013-10-15

申请号：US12936706

申请日：2008-04-18

申请人： Yuji Yasui ,  Ikue Kawasumi ,  Michael Fischer

发明人： Yuji Yasui ,  Ikue Kawasumi ,  Michael Fischer

IPC分类号： F01N3/10

CPC分类号： F01N3/208 ,  F01N13/0093 ,  F01N13/0097 ,  F01N2560/021 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/0408 ,  F01N2900/0411 ,  F01N2900/1402 ,  F01N2900/1622 ,  Y02T10/24

摘要： An exhaust purification apparatus for internal combustion engine having a selective reduction catalyst that while maintaining a high NOx reduction ratio, inhibits any ammonia discharge downstream of the selective reduction catalyst. In the exhaust purification apparatus (2), a urea selective reduction catalyst (23) comprises a first selective reduction catalyst (231) and, provided downstream of the first selective reduction catalyst (231) in an exhaust passageway (11), a second selective reduction catalyst (232). Further, the exhaust purification apparatus (2) includes a urea injection unit (25) for feeding of a reducing agent upstream of the urea selective reduction catalyst (23) in the exhaust passageway (11) and an ammonia sensor (26) for detection of the ammonia concentration at a site between the first selective reduction catalyst (231) and the second selective reduction catalyst (232) in the exhaust passageway (11). The rate of urea injection, GUREA, by the urea injection unit (25) is determined so that the value of ammonia concentration, NH3CONS, detected by the ammonia sensor (26) is greater than “0.”

摘要翻译： 具有选择还原催化剂的内燃机的排气净化装置，其在保持高NOx还原率的同时，抑制选择还原催化剂下游的氨排放。 在排气净化装置（2）中，尿素选择还原催化剂（23）包括第一选择还原催化剂（231），并且设置在排气通路（11）中的第一选择还原催化剂（231）的下游，第二选择还原催化剂 还原催化剂（232）。 此外，排气净化装置（2）具备：尿素喷射单元（25），用于在排气通路（11）中的尿素选择还原催化剂（23）的上游侧供给还原剂，以及氨传感器（26） 在排气通道（11）中的第一选择还原催化剂（231）和第二选择还原催化剂（232）之间的位置处的氨浓度。 确定尿素注入单元（25）的尿素注入速率GUREA，使得氨传感器（26）检测到的氨浓度NH3CONS值大于“0”。