公开(公告)号：US5785937A

公开(公告)日：1998-07-28

申请号：US798517

申请日：1997-02-10

Applicant: Ronald Neufert ,  Wieland Mathes ,  Dagmar Schobert-Schaefer ,  Lothar Hofmann

Inventor： Ronald Neufert ,  Wieland Mathes ,  Dagmar Schobert-Schaefer ,  Lothar Hofmann

IPC: B01D53/30 ,  B01D53/86 ,  B01D53/94 ,  F01N3/20

CPC classification number: F01N3/208 ,  B01D53/30 ,  B01D53/8696 ,  B01D53/9431 ,  B01D53/9495 ,  F01N2560/06 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  Y02T10/24

Abstract: A method is provided in which the reducing agent, during the starting phase of the internal-combustion engine and during operation with decreasing and, if appropriate, virtually constant exhaust gas temperature, is fed superstoichiometrically in relation to the nitrogen oxide concentration, while taking into account the temperature-dependent storage capacity of a denitration catalytic converter for the reducing agent. The reducing agent is otherwise fed substoichiometrically. In this manner, the catalytic converter is kept at all times at a preferred charge level, so that on one hand it is possible to provide sufficient stored reducing agent for the catalytic conversion and on the other hand it is possible to still have a reducing agent buffer available which avoids slip of the reducing agent. The invention can be used in all internal-combustion engines operated with air excess, such as diesel engines and lean-burn engines.

Abstract translation: 提供了一种方法，其中在内燃机的起动阶段和在运行期间还原剂在减少并且如果适当的情况下基本上恒定的排气温度被加入到超氧化物计量相对于氮氧化物浓度的同时， 考虑了用于还原剂的脱硝催化转化器的温度依赖性储存容量。 还原剂另外以化学计量方式进料。 以这种方式，催化转化器始终保持在优选的装料水平，因此一方面可以提供足够的储存的用于催化转化的还原剂，另一方面可以还有还原剂 缓冲剂可以避免还原剂的滑脱。 本发明可以用于所有使用空气过剩的内燃机，例如柴油发动机和稀燃燃烧发动机。

公开(公告)号：US07507684B2

公开(公告)日：2009-03-24

申请号：US11647889

申请日：2006-12-29

Applicant: Lothar Hofmann ,  Jörg Münch ,  Ralf Dotzel

Inventor： Lothar Hofmann ,  Jörg Münch ,  Ralf Dotzel

IPC: B01J29/06

CPC classification number: B01D53/9418 ,  B01D2251/2067 ,  B01D2255/2065 ,  B01D2255/20738 ,  B01D2255/20761 ,  B01D2255/2092 ,  B01D2255/50 ,  B01D2258/012 ,  B01J29/46 ,  B01J29/7615 ,  B01J35/04 ,  B01J37/0009 ,  B01J2229/186 ,  B01J2229/42

Abstract: The invention relates to an extruded solid catalyst body for breaking down nitrogen oxides in the presence of a reducing agent as well as to a process for manufacture of said body. The solid catalyst body has an active material that contains 60 to 87% by weight of an ion-exchanged zeolite containing at least one metal from the group containing Cu, Hf, La, Au, In, V, lanthanoids and transition metals of group VIII of the periodic system, more than 10 to 37% by weight of aluminum oxide and 2 to 10% by weight of inorganic fibers. The solid catalyst body, the active material of which contains a zeolite can be manufactured by extrusion and has a high degree of mechanical stability at a high catalytic activity.

Abstract translation: 本发明涉及用于在还原剂存在下分解氮氧化物的挤出固体催化剂体以及制造所述体的方法。 固体催化剂体具有含有60〜87重量％的含有Cu，Hf，La，Au，In，V，镧系元素和VIII族过渡金属的至少一种金属的离子交换沸石的活性物质 的超过10至37重量％的氧化铝和2至10重量％的无机纤维。 其活性物质含有沸石的固体催化剂体可以通过挤出制造，并且在高催化活性下具有高度的机械稳定性。

公开(公告)号：US20080250640A1

公开(公告)日：2008-10-16

申请号：US12088117

申请日：2006-08-09

Applicant: Simon Reichstein ,  Lothar Hofmann ,  Peter Konrad

Inventor： Simon Reichstein ,  Lothar Hofmann ,  Peter Konrad

IPC: B23P15/10

CPC classification number: B23P15/10 ,  F02F3/22 ,  F02F2003/0061 ,  F16J1/09 ,  Y10T29/49249 ,  Y10T29/49254 ,  Y10T29/49263 ,  Y10T29/49265

Abstract: The invention relates to a method for producing an internal combustion engine piston which is provided with at least one cooling channel (12) and at least one reinforced piston ring groove (14) consisting in producing a piston blank (1), in forming a groove (10) provided with a cooling channel (12) and an external ring (11) in said piston blank (1), in filling the cooling channel (12) with are movable material (2), in filling the external ring with a reinforcing material (3) in removing the removable material (2) and in finish-machining the piston. A piston made of aluminium alloy and produced according to the inventive method is also disclosed.

Abstract translation: 本发明涉及一种生产内燃机活塞的方法，该内燃机活塞设有至少一个冷却通道（12）和至少一个加强的活塞环槽（14），该活塞环槽（14）由制造活塞坯件（1）组成， （10），在所述活塞坯件（1）中设置有冷却通道（12）和外环（11），用可移动材料（2）填充所述冷却通道（12），用加强件 材料（3）在去除可移除材料（2）和精加工活塞时。 还公开了根据本发明的方法制造的由铝合金制成的活塞。

公开(公告)号：US06475453B1

公开(公告)日：2002-11-05

申请号：US09133004

申请日：1998-08-12

Applicant: Wieland Mathes ,  Lothar Hofmann ,  Frank Witzel

Inventor： Wieland Mathes ,  Lothar Hofmann ,  Frank Witzel

IPC: B01J2104

CPC classification number: F01N3/2066 ,  B01D53/9431 ,  B01D53/9477 ,  B01J35/04 ,  F01N13/0097 ,  F01N2330/06 ,  F01N2610/02 ,  Y02T10/24

Abstract: A configuration for decomposing nitrogen oxides in a gas stream includes a plurality of catalytic converters disposed one after the other through which the gas stream can flow. Each of the catalytic converters has a honeycomb structure with many parallel cells through which the gas stream can flow. Each of the catalytic converters also has a predetermined cell density and a predetermined average level of activity defined as a proportion by weight of the catalytically active agent. The predetermined cell density of a second catalytic converter through which the gas stream flows after a first catalytic converter is lower than the predetermined cell density of the first catalytic converter. The predetermined average level of activity of the second catalytic converter is also higher than the predetermined average level of activity of the first catalytic converter. The configuration is preferably used in conjunction with an exhaust gas from a combustion drive unit.

Abstract translation: 用于分解气流中的氮氧化物的构造包括多个催化转化器，其一个接一个地设置，气流可以流过。 每个催化转化器具有蜂窝结构，其具有许多平行的气室，气流可以流过该蜂窝结构。 每个催化转化器还具有预定的细胞密度和预定的平均活性水平，定义为催化活性剂的重量比例。 气体流在第一催化转化器之后流过的第二催化转化器的预定电池密度低于第一催化转化器的预定电池密度。 第二催化转化器的预定平均活性水平也高于第一催化转化器的预定平均活性水平。 该结构优选与来自燃烧驱动单元的废气结合使用。

公开(公告)号：US06470676B2

公开(公告)日：2002-10-29

申请号：US09909388

申请日：2001-07-19

Applicant: Winfried Dölling ,  Lothar Hofmann

Inventor： Winfried Dölling ,  Lothar Hofmann

IPC: F01N300

CPC classification number: F01N3/2066 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  Y02A50/2344 ,  Y02T10/24

Abstract: A method is provided for the catalytic conversion of nitrogen oxides contained in the exhaust gas of an internal combustion engine. A reducing agent is added in a controlled manner upstream of a denitrification catalyst, as seen in exhaust gas flow direction, and in dependence on a nitrogen oxide concentration. The reducing agent is added in a superstoichiometric amount in relation to the nitrogen oxide content if an operating parameter and/or a value derived from the operating parameter falls below or exceeds a threshold value. The addition of the reducing agent is then terminated or continued in a substoichiometric manner. The invention provides a measure for obtaining an extremely high average nitrogen oxide conversion, especially under varying operating conditions of the internal combustion engine.

Abstract translation: 提供了用于催化转化内燃机排气中所含的氮氧化物的方法。 在脱氮催化剂的上游以可控的方式添加还原剂，如在废气流动方向上所看到的，并且依赖于氮氧化物浓度。 如果操作参数和/或从操作参数导出的值低于或超过阈值，则相对于氮氧化物含量以超化学计量的量加入还原剂。 然后以亚化学计量方式终止或继续加入还原剂。 本发明提供了获得极高平均氮氧化物转化率的措施，特别是在内燃机的变化的操作条件下。

公开(公告)号：US06444177B1

公开(公告)日：2002-09-03

申请号：US08995646

申请日：1997-12-29

Applicant: Raimund Müller ,  Lothar Hofmann ,  Kurt Schardt ,  Wieland Mathes

Inventor： Raimund Müller ,  Lothar Hofmann ,  Kurt Schardt ,  Wieland Mathes

IPC: B01D5386

CPC classification number: F01N3/2066 ,  B01D53/8631 ,  B01D53/8656 ,  B01D53/885 ,  B01F3/04049 ,  B01F5/0065 ,  B01F5/045 ,  B01F2005/0091 ,  F01N13/0097 ,  F01N13/017 ,  F01N2240/20 ,  F01N2240/40 ,  F01N2470/22 ,  F01N2610/02 ,  Y02T10/24

Abstract: Exhaust gas to be cleaned is introduced into a conversion and mixing duct and the exhaust gas flows through the duct along a predetermined longitudinal direction. A reducing agent, such as aqueous urea solution, is injected into the exhaust gas stream in the conversion and mixing duct. The exhaust gas stream is then deflected into a reaction duct which extends parallel to or coaxially around the conversion and mixing duct. The exhaust gas then flows in the opposite direction through the reaction duct. A reduction catalyst is disposed in the reaction duct, where the reducible components of the exhaust gas are reduced. The exhaust gas cleaned in this manner is then discharged from the reaction duct.

Abstract translation: 要清洁的废气被引入转化和混合管道中，排气沿预定的纵向方向流过管道。 还原剂，例如尿素水溶液，被注入到转化和混合管道中的废气流中。 废气流然后被偏转到与转换和混合管道平行或同轴延伸的反应管道中。 废气然后沿相反方向流过反应管。 还原催化剂设置在反应管道中，其中废气的可还原组分被还原。 以这种方式清洁的废气然后从反应管排出。

公开(公告)号：US06209313B1

公开(公告)日：2001-04-03

申请号：US09188723

申请日：1998-11-09

Applicant: Gerhard Wissler ,  Günther Pajonk ,  Lothar Hofmann ,  Manfred Weigl

Inventor： Gerhard Wissler ,  Günther Pajonk ,  Lothar Hofmann ,  Manfred Weigl

IPC: F01N300

CPC classification number: F01N3/2066 ,  F01N2430/00 ,  F01N2610/02 ,  F02D21/08 ,  F02D31/008 ,  F02D41/0235 ,  F02D41/40 ,  F02D2250/36 ,  Y02T10/24 ,  Y02T10/44

Abstract: Excessive NOx emission in a diesel internal combustion engine with SCR exhaust gas treatment is detected by a control unit. The excessive NOx emission value is determined from the catalytic-converter efficiency calculated for the metering of the reducing agent. In response, measures are taken, such as delayed start of the fuel injection, deactivation of a coasting cutoff, reducing an exhaust gas recirculation rate and/or increasing the idling speed. As a result, the NOx content in the untreated exhaust gas drops, the catalytic-converter temperature increases more quickly after a cold start, and the NOx emission is reduced.

Abstract translation: 具有SCR排气处理的柴油内燃机中的NOx排放过多由控制单元检测。 根据对还原剂的计量计算的催化转化器效率来确定过量的NOx排放值。 作为响应，采取措施，例如延迟启动燃料喷射，停止滑行切断，降低废气再循环速率和/或增加怠速。 结果，未处理废气中的NOx含量下降，催化转化器温度在冷启动后升高得更快，NOx排放减少。

公开(公告)号：US20070259770A1

公开(公告)日：2007-11-08

申请号：US11647889

申请日：2006-12-29

Applicant: Lothar Hofmann ,  Jorg Munch ,  Ralf Dotzel

Inventor： Lothar Hofmann ,  Jorg Munch ,  Ralf Dotzel

IPC: B01J29/04

CPC classification number: B01D53/9418 ,  B01D2251/2067 ,  B01D2255/2065 ,  B01D2255/20738 ,  B01D2255/20761 ,  B01D2255/2092 ,  B01D2255/50 ,  B01D2258/012 ,  B01J29/46 ,  B01J29/7615 ,  B01J35/04 ,  B01J37/0009 ,  B01J2229/186 ,  B01J2229/42

Abstract: The invention relates to an extruded solid catalyst body for breaking down nitrogen oxides in the presence of a reducing agent as well as to a process for manufacture of said body. The solid catalyst body has an active material that contains 60 to 87% by weight of an ion-exchanged zeolite containing at least one metal from the group containing Cu, Hf, La, Au, In, V, lanthanoids and transition metals of group VIII of the periodic system, more than 10 to 37% by weight of aluminum oxide and 2 to 10% by weight of inorganic fibers. The solid catalyst body, the active material of which contains a zeolite can be manufactured by extrusion and has a high degree of mechanical stability at a high catalytic activity.

Abstract translation: 本发明涉及用于在还原剂存在下分解氮氧化物的挤出固体催化剂体以及制造所述体的方法。 固体催化剂体具有含有60〜87重量％的含有Cu，Hf，La，Au，In，V，镧系元素和VIII族过渡金属的至少一种金属的离子交换沸石的活性物质 的超过10至37重量％的氧化铝和2至10重量％的无机纤维。 其活性物质含有沸石的固体催化剂体可以通过挤出制造，并且在高催化活性下具有高度的机械稳定性。

公开(公告)号：US06737033B1

公开(公告)日：2004-05-18

申请号：US09677356

申请日：2000-10-02

Applicant: Lothar Hofmann ,  Wieland Mathes

Inventor： Lothar Hofmann ,  Wieland Mathes

IPC: B01D5356

CPC classification number: F01N3/208 ,  B01D53/90 ,  B01D53/9454 ,  F01N2560/026 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/14 ,  Y02T10/22 ,  Y02T10/24

Abstract: The method and the device are configured for the catalytic removal of a pollutant contained in an exhaust gas of a combustion system using a reagent. A temporal mean, or time average, is formed for the concentration of the pollutant in the exhaust gas. The catalytic converter is laid out for complete conversion if the reagent is introduced stoichiometrically. Here, the reagent is introduced in substoichiometric proportions with respect to the time average of the pollutant content.

Abstract translation: 该方法和装置被配置用于使用试剂催化除去包含在燃烧系统的废气中的污染物。 为排气中污染物的浓度形成时间平均值或时间平均值。 如果试剂以化学计量的方式引入，则催化转化器布置成完全转化。 这里，相对于污染物含量的时间平均值，以化学计量比例引入试剂。

公开(公告)号：US06553755B2

公开(公告)日：2003-04-29

申请号：US10133258

申请日：2002-04-25

Applicant: Lothar Hofmann ,  Wieland Mathes ,  Udo Klumpp

Inventor： Lothar Hofmann ,  Wieland Mathes ,  Udo Klumpp

IPC: F01N300

CPC classification number: F01N3/2066 ,  B01F3/04021 ,  B01F5/0451 ,  B01F5/0693 ,  F01N3/2892 ,  F01N2240/20 ,  F01N2570/14 ,  F01N2610/02 ,  Y02C20/10 ,  Y02T10/24

Abstract: A static mixer in the exhaust emission control system of an excess-air-operated combustion engine is formed of an expanded grid with a plurality of openings formed between crossbars. Using an expanded grid achieves both good mixing of the exhaust gas with a reducing agent in a short mixing path and properly aligns the exhaust flow.